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Annotation of mandoc/roff.c, Revision 1.228

1.228   ! schwarze    1: /*     $Id: roff.c,v 1.227 2014/09/06 22:39:36 schwarze Exp $ */
1.1       kristaps    2: /*
1.175     schwarze    3:  * Copyright (c) 2010, 2011, 2012 Kristaps Dzonsons <kristaps@bsd.lv>
1.190     schwarze    4:  * Copyright (c) 2010-2014 Ingo Schwarze <schwarze@openbsd.org>
1.1       kristaps    5:  *
                      6:  * Permission to use, copy, modify, and distribute this software for any
1.66      kristaps    7:  * purpose with or without fee is hereby granted, provided that the above
                      8:  * copyright notice and this permission notice appear in all copies.
1.1       kristaps    9:  *
1.106     kristaps   10:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
1.66      kristaps   11:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
1.106     kristaps   12:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
1.66      kristaps   13:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     14:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     15:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     16:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
1.1       kristaps   17:  */
1.66      kristaps   18: #include "config.h"
1.225     schwarze   19:
                     20: #include <sys/types.h>
1.30      kristaps   21:
1.67      kristaps   22: #include <assert.h>
1.85      kristaps   23: #include <ctype.h>
1.178     schwarze   24: #include <stdio.h>
1.1       kristaps   25: #include <stdlib.h>
1.67      kristaps   26: #include <string.h>
1.1       kristaps   27:
1.67      kristaps   28: #include "mandoc.h"
1.201     schwarze   29: #include "mandoc_aux.h"
1.226     schwarze   30: #include "libmandoc.h"
1.109     kristaps   31: #include "libroff.h"
1.33      kristaps   32:
1.141     kristaps   33: /* Maximum number of nested if-else conditionals. */
1.82      kristaps   34: #define        RSTACK_MAX      128
                     35:
1.170     schwarze   36: /* Maximum number of string expansions per line, to break infinite loops. */
                     37: #define        EXPAND_LIMIT    1000
                     38:
1.67      kristaps   39: enum   rofft {
1.103     kristaps   40:        ROFF_ad,
1.80      kristaps   41:        ROFF_am,
                     42:        ROFF_ami,
                     43:        ROFF_am1,
1.193     schwarze   44:        ROFF_as,
1.174     kristaps   45:        ROFF_cc,
1.194     schwarze   46:        ROFF_ce,
1.80      kristaps   47:        ROFF_de,
                     48:        ROFF_dei,
                     49:        ROFF_de1,
1.83      schwarze   50:        ROFF_ds,
1.82      kristaps   51:        ROFF_el,
1.185     schwarze   52:        ROFF_fam,
1.186     schwarze   53:        ROFF_hw,
1.103     kristaps   54:        ROFF_hy,
1.82      kristaps   55:        ROFF_ie,
1.75      kristaps   56:        ROFF_if,
1.76      kristaps   57:        ROFF_ig,
1.123     schwarze   58:        ROFF_it,
1.103     kristaps   59:        ROFF_ne,
                     60:        ROFF_nh,
1.104     kristaps   61:        ROFF_nr,
1.124     schwarze   62:        ROFF_ns,
                     63:        ROFF_ps,
1.83      schwarze   64:        ROFF_rm,
1.203     schwarze   65:        ROFF_rr,
1.105     kristaps   66:        ROFF_so,
1.124     schwarze   67:        ROFF_ta,
1.83      schwarze   68:        ROFF_tr,
1.175     schwarze   69:        ROFF_Dd,
                     70:        ROFF_TH,
1.109     kristaps   71:        ROFF_TS,
                     72:        ROFF_TE,
1.112     kristaps   73:        ROFF_T_,
1.125     kristaps   74:        ROFF_EQ,
                     75:        ROFF_EN,
1.76      kristaps   76:        ROFF_cblock,
1.106     kristaps   77:        ROFF_USERDEF,
1.67      kristaps   78:        ROFF_MAX
                     79: };
                     80:
1.147     kristaps   81: /*
1.167     kristaps   82:  * An incredibly-simple string buffer.
                     83:  */
1.94      kristaps   84: struct roffstr {
1.167     kristaps   85:        char            *p; /* nil-terminated buffer */
                     86:        size_t           sz; /* saved strlen(p) */
1.166     kristaps   87: };
                     88:
                     89: /*
1.167     kristaps   90:  * A key-value roffstr pair as part of a singly-linked list.
1.166     kristaps   91:  */
                     92: struct roffkv {
                     93:        struct roffstr   key;
                     94:        struct roffstr   val;
                     95:        struct roffkv   *next; /* next in list */
1.94      kristaps   96: };
                     97:
1.180     schwarze   98: /*
                     99:  * A single number register as part of a singly-linked list.
                    100:  */
                    101: struct roffreg {
                    102:        struct roffstr   key;
1.181     schwarze  103:        int              val;
1.180     schwarze  104:        struct roffreg  *next;
                    105: };
                    106:
1.67      kristaps  107: struct roff {
1.128     kristaps  108:        struct mparse   *parse; /* parse point */
1.67      kristaps  109:        struct roffnode *last; /* leaf of stack */
1.223     schwarze  110:        int             *rstack; /* stack of inverted `ie' values */
1.180     schwarze  111:        struct roffreg  *regtab; /* number registers */
1.166     kristaps  112:        struct roffkv   *strtab; /* user-defined strings & macros */
1.167     kristaps  113:        struct roffkv   *xmbtab; /* multi-byte trans table (`tr') */
                    114:        struct roffstr  *xtab; /* single-byte trans table (`tr') */
1.106     kristaps  115:        const char      *current_string; /* value of last called user macro */
1.118     kristaps  116:        struct tbl_node *first_tbl; /* first table parsed */
                    117:        struct tbl_node *last_tbl; /* last table parsed */
                    118:        struct tbl_node *tbl; /* current table being parsed */
1.125     kristaps  119:        struct eqn_node *last_eqn; /* last equation parsed */
                    120:        struct eqn_node *first_eqn; /* first equation parsed */
                    121:        struct eqn_node *eqn; /* current equation being parsed */
1.223     schwarze  122:        int              options; /* parse options */
                    123:        int              rstacksz; /* current size limit of rstack */
                    124:        int              rstackpos; /* position in rstack */
1.227     schwarze  125:        int              format; /* current file in mdoc or man format */
1.223     schwarze  126:        char             control; /* control character */
1.79      kristaps  127: };
                    128:
1.67      kristaps  129: struct roffnode {
                    130:        enum rofft       tok; /* type of node */
                    131:        struct roffnode *parent; /* up one in stack */
                    132:        int              line; /* parse line */
                    133:        int              col; /* parse col */
1.106     kristaps  134:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  135:        char            *end; /* end-rules: custom token */
                    136:        int              endspan; /* end-rules: next-line or infty */
1.198     schwarze  137:        int              rule; /* current evaluation rule */
1.67      kristaps  138: };
                    139:
                    140: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  141:                         enum rofft tok, /* tok of macro */ \
1.207     schwarze  142:                         char **bufp, /* input buffer */ \
1.67      kristaps  143:                         size_t *szp, /* size of input buffer */ \
                    144:                         int ln, /* parse line */ \
1.75      kristaps  145:                         int ppos, /* original pos in buffer */ \
                    146:                         int pos, /* current pos in buffer */ \
1.74      kristaps  147:                         int *offs /* reset offset of buffer data */
1.67      kristaps  148:
                    149: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    150:
                    151: struct roffmac {
                    152:        const char      *name; /* macro name */
1.79      kristaps  153:        roffproc         proc; /* process new macro */
                    154:        roffproc         text; /* process as child text of macro */
                    155:        roffproc         sub; /* process as child of macro */
                    156:        int              flags;
                    157: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  158:        struct roffmac  *next;
1.67      kristaps  159: };
                    160:
1.141     kristaps  161: struct predef {
                    162:        const char      *name; /* predefined input name */
                    163:        const char      *str; /* replacement symbol */
                    164: };
                    165:
                    166: #define        PREDEF(__name, __str) \
                    167:        { (__name), (__str) },
                    168:
1.155     kristaps  169: static enum rofft       roffhash_find(const char *, size_t);
                    170: static void             roffhash_init(void);
                    171: static void             roffnode_cleanscope(struct roff *);
                    172: static void             roffnode_pop(struct roff *);
                    173: static void             roffnode_push(struct roff *, enum rofft,
                    174:                                const char *, int, int);
1.80      kristaps  175: static enum rofferr     roff_block(ROFF_ARGS);
                    176: static enum rofferr     roff_block_text(ROFF_ARGS);
                    177: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    178: static enum rofferr     roff_cblock(ROFF_ARGS);
1.174     kristaps  179: static enum rofferr     roff_cc(ROFF_ARGS);
1.195     schwarze  180: static void             roff_ccond(struct roff *, int, int);
1.82      kristaps  181: static enum rofferr     roff_cond(ROFF_ARGS);
                    182: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    183: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  184: static enum rofferr     roff_ds(ROFF_ARGS);
1.198     schwarze  185: static int              roff_evalcond(const char *, int *);
1.204     schwarze  186: static int              roff_evalnum(const char *, int *, int *, int);
                    187: static int              roff_evalpar(const char *, int *, int *);
1.198     schwarze  188: static int              roff_evalstrcond(const char *, int *);
1.155     kristaps  189: static void             roff_free1(struct roff *);
1.180     schwarze  190: static void             roff_freereg(struct roffreg *);
1.167     kristaps  191: static void             roff_freestr(struct roffkv *);
1.212     schwarze  192: static size_t           roff_getname(struct roff *, char **, int, int);
1.184     schwarze  193: static int              roff_getnum(const char *, int *, int *);
                    194: static int              roff_getop(const char *, int *, char *);
1.181     schwarze  195: static int              roff_getregn(const struct roff *,
                    196:                                const char *, size_t);
1.192     schwarze  197: static int              roff_getregro(const char *name);
1.207     schwarze  198: static const char      *roff_getstrn(const struct roff *,
1.94      kristaps  199:                                const char *, size_t);
1.178     schwarze  200: static enum rofferr     roff_it(ROFF_ARGS);
1.103     kristaps  201: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  202: static enum rofferr     roff_nr(ROFF_ARGS);
1.169     schwarze  203: static void             roff_openeqn(struct roff *, const char *,
1.156     kristaps  204:                                int, int, const char *);
1.214     schwarze  205: static enum rofft       roff_parse(struct roff *, char *, int *,
                    206:                                int, int);
1.178     schwarze  207: static enum rofferr     roff_parsetext(char **, size_t *, int, int *);
1.207     schwarze  208: static enum rofferr     roff_res(struct roff *,
1.142     kristaps  209:                                char **, size_t *, int, int);
1.122     schwarze  210: static enum rofferr     roff_rm(ROFF_ARGS);
1.203     schwarze  211: static enum rofferr     roff_rr(ROFF_ARGS);
1.94      kristaps  212: static void             roff_setstr(struct roff *,
1.106     kristaps  213:                                const char *, const char *, int);
1.207     schwarze  214: static void             roff_setstrn(struct roffkv **, const char *,
1.164     kristaps  215:                                size_t, const char *, size_t, int);
1.105     kristaps  216: static enum rofferr     roff_so(ROFF_ARGS);
1.164     kristaps  217: static enum rofferr     roff_tr(ROFF_ARGS);
1.175     schwarze  218: static enum rofferr     roff_Dd(ROFF_ARGS);
                    219: static enum rofferr     roff_TH(ROFF_ARGS);
1.109     kristaps  220: static enum rofferr     roff_TE(ROFF_ARGS);
                    221: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  222: static enum rofferr     roff_EQ(ROFF_ARGS);
                    223: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  224: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  225: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  226:
1.155     kristaps  227: /* See roffhash_find() */
1.85      kristaps  228:
                    229: #define        ASCII_HI         126
                    230: #define        ASCII_LO         33
                    231: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    232:
                    233: static struct roffmac  *hash[HASHWIDTH];
                    234:
                    235: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  236:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  237:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    238:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    239:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.193     schwarze  240:        { "as", roff_ds, NULL, NULL, 0, NULL },
1.174     kristaps  241:        { "cc", roff_cc, NULL, NULL, 0, NULL },
1.194     schwarze  242:        { "ce", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  243:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    244:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    245:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  246:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  247:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.185     schwarze  248:        { "fam", roff_line_ignore, NULL, NULL, 0, NULL },
1.186     schwarze  249:        { "hw", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  250:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  251:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    252:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    253:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.178     schwarze  254:        { "it", roff_it, NULL, NULL, 0, NULL },
1.103     kristaps  255:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    256:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  257:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  258:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
                    259:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  260:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.203     schwarze  261:        { "rr", roff_rr, NULL, NULL, 0, NULL },
1.105     kristaps  262:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  263:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.164     kristaps  264:        { "tr", roff_tr, NULL, NULL, 0, NULL },
1.175     schwarze  265:        { "Dd", roff_Dd, NULL, NULL, 0, NULL },
                    266:        { "TH", roff_TH, NULL, NULL, 0, NULL },
1.109     kristaps  267:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    268:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  269:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  270:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    271:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.85      kristaps  272:        { ".", roff_cblock, NULL, NULL, 0, NULL },
1.106     kristaps  273:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  274: };
                    275:
1.200     schwarze  276: /* not currently implemented: Ds em Eq LP Me PP pp Or Rd Sf SH */
1.175     schwarze  277: const  char *const __mdoc_reserved[] = {
                    278:        "Ac", "Ad", "An", "Ao", "Ap", "Aq", "Ar", "At",
                    279:        "Bc", "Bd", "Bf", "Bk", "Bl", "Bo", "Bq",
                    280:        "Brc", "Bro", "Brq", "Bsx", "Bt", "Bx",
                    281:        "Cd", "Cm", "Db", "Dc", "Dd", "Dl", "Do", "Dq",
1.200     schwarze  282:        "Dt", "Dv", "Dx", "D1",
                    283:        "Ec", "Ed", "Ef", "Ek", "El", "Em",
                    284:        "En", "Eo", "Er", "Es", "Ev", "Ex",
1.175     schwarze  285:        "Fa", "Fc", "Fd", "Fl", "Fn", "Fo", "Fr", "Ft", "Fx",
1.200     schwarze  286:        "Hf", "Ic", "In", "It", "Lb", "Li", "Lk", "Lp",
                    287:        "Ms", "Mt", "Nd", "Nm", "No", "Ns", "Nx",
1.175     schwarze  288:        "Oc", "Oo", "Op", "Os", "Ot", "Ox",
1.200     schwarze  289:        "Pa", "Pc", "Pf", "Po", "Pp", "Pq",
                    290:        "Qc", "Ql", "Qo", "Qq", "Re", "Rs", "Rv",
                    291:        "Sc", "Sh", "Sm", "So", "Sq",
1.175     schwarze  292:        "Ss", "St", "Sx", "Sy",
                    293:        "Ta", "Tn", "Ud", "Ux", "Va", "Vt", "Xc", "Xo", "Xr",
1.200     schwarze  294:        "%A", "%B", "%C", "%D", "%I", "%J", "%N", "%O",
1.175     schwarze  295:        "%P", "%Q", "%R", "%T", "%U", "%V",
                    296:        NULL
                    297: };
                    298:
1.200     schwarze  299: /* not currently implemented: BT DE DS ME MT PT SY TQ YS */
1.175     schwarze  300: const  char *const __man_reserved[] = {
1.200     schwarze  301:        "AT", "B", "BI", "BR", "DT",
                    302:        "EE", "EN", "EQ", "EX", "HP", "I", "IB", "IP", "IR",
                    303:        "LP", "OP", "P", "PD", "PP",
                    304:        "R", "RB", "RE", "RI", "RS", "SB", "SH", "SM", "SS",
                    305:        "TE", "TH", "TP", "TS", "T&", "UC", "UE", "UR",
1.175     schwarze  306:        NULL
                    307: };
                    308:
1.141     kristaps  309: /* Array of injected predefined strings. */
                    310: #define        PREDEFS_MAX      38
                    311: static const struct predef predefs[PREDEFS_MAX] = {
                    312: #include "predefs.in"
                    313: };
                    314:
1.155     kristaps  315: /* See roffhash_find() */
1.85      kristaps  316: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    317:
1.178     schwarze  318: static int      roffit_lines;  /* number of lines to delay */
                    319: static char    *roffit_macro;  /* nil-terminated macro line */
                    320:
1.207     schwarze  321:
1.85      kristaps  322: static void
1.155     kristaps  323: roffhash_init(void)
1.85      kristaps  324: {
                    325:        struct roffmac   *n;
                    326:        int               buc, i;
                    327:
1.106     kristaps  328:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  329:                assert(roffs[i].name[0] >= ASCII_LO);
                    330:                assert(roffs[i].name[0] <= ASCII_HI);
                    331:
                    332:                buc = ROFF_HASH(roffs[i].name);
                    333:
                    334:                if (NULL != (n = hash[buc])) {
                    335:                        for ( ; n->next; n = n->next)
                    336:                                /* Do nothing. */ ;
                    337:                        n->next = &roffs[i];
                    338:                } else
                    339:                        hash[buc] = &roffs[i];
                    340:        }
                    341: }
                    342:
1.67      kristaps  343: /*
                    344:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    345:  * the nil-terminated string name could be found.
                    346:  */
                    347: static enum rofft
1.155     kristaps  348: roffhash_find(const char *p, size_t s)
1.67      kristaps  349: {
1.85      kristaps  350:        int              buc;
                    351:        struct roffmac  *n;
1.67      kristaps  352:
1.85      kristaps  353:        /*
                    354:         * libroff has an extremely simple hashtable, for the time
                    355:         * being, which simply keys on the first character, which must
                    356:         * be printable, then walks a chain.  It works well enough until
                    357:         * optimised.
                    358:         */
                    359:
                    360:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    361:                return(ROFF_MAX);
                    362:
                    363:        buc = ROFF_HASH(p);
                    364:
                    365:        if (NULL == (n = hash[buc]))
                    366:                return(ROFF_MAX);
                    367:        for ( ; n; n = n->next)
1.106     kristaps  368:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  369:                        return((enum rofft)(n - roffs));
1.67      kristaps  370:
                    371:        return(ROFF_MAX);
                    372: }
                    373:
                    374: /*
                    375:  * Pop the current node off of the stack of roff instructions currently
                    376:  * pending.
                    377:  */
                    378: static void
                    379: roffnode_pop(struct roff *r)
                    380: {
                    381:        struct roffnode *p;
                    382:
1.75      kristaps  383:        assert(r->last);
1.207     schwarze  384:        p = r->last;
1.82      kristaps  385:
1.75      kristaps  386:        r->last = r->last->parent;
1.106     kristaps  387:        free(p->name);
                    388:        free(p->end);
1.67      kristaps  389:        free(p);
                    390: }
                    391:
                    392: /*
                    393:  * Push a roff node onto the instruction stack.  This must later be
                    394:  * removed with roffnode_pop().
                    395:  */
1.98      schwarze  396: static void
1.106     kristaps  397: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    398:                int line, int col)
1.67      kristaps  399: {
                    400:        struct roffnode *p;
                    401:
1.98      schwarze  402:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  403:        p->tok = tok;
1.106     kristaps  404:        if (name)
                    405:                p->name = mandoc_strdup(name);
1.67      kristaps  406:        p->parent = r->last;
                    407:        p->line = line;
                    408:        p->col = col;
1.198     schwarze  409:        p->rule = p->parent ? p->parent->rule : 0;
1.67      kristaps  410:
                    411:        r->last = p;
                    412: }
                    413:
                    414: static void
                    415: roff_free1(struct roff *r)
                    416: {
1.176     schwarze  417:        struct tbl_node *tbl;
1.125     kristaps  418:        struct eqn_node *e;
1.167     kristaps  419:        int              i;
1.67      kristaps  420:
1.176     schwarze  421:        while (NULL != (tbl = r->first_tbl)) {
                    422:                r->first_tbl = tbl->next;
                    423:                tbl_free(tbl);
1.109     kristaps  424:        }
1.113     kristaps  425:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    426:
1.125     kristaps  427:        while (NULL != (e = r->first_eqn)) {
                    428:                r->first_eqn = e->next;
                    429:                eqn_free(e);
                    430:        }
                    431:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    432:
1.67      kristaps  433:        while (r->last)
                    434:                roffnode_pop(r);
1.109     kristaps  435:
1.223     schwarze  436:        free (r->rstack);
                    437:        r->rstack = NULL;
                    438:        r->rstacksz = 0;
                    439:        r->rstackpos = -1;
                    440:
                    441:        roff_freereg(r->regtab);
                    442:        r->regtab = NULL;
                    443:
1.167     kristaps  444:        roff_freestr(r->strtab);
                    445:        roff_freestr(r->xmbtab);
                    446:        r->strtab = r->xmbtab = NULL;
                    447:
                    448:        if (r->xtab)
                    449:                for (i = 0; i < 128; i++)
                    450:                        free(r->xtab[i].p);
                    451:        free(r->xtab);
                    452:        r->xtab = NULL;
1.67      kristaps  453: }
                    454:
                    455: void
                    456: roff_reset(struct roff *r)
                    457: {
                    458:
                    459:        roff_free1(r);
1.227     schwarze  460:        r->format = r->options & (MPARSE_MDOC | MPARSE_MAN);
1.174     kristaps  461:        r->control = 0;
1.67      kristaps  462: }
                    463:
                    464: void
                    465: roff_free(struct roff *r)
                    466: {
                    467:
                    468:        roff_free1(r);
                    469:        free(r);
                    470: }
                    471:
                    472: struct roff *
1.199     schwarze  473: roff_alloc(struct mparse *parse, int options)
1.67      kristaps  474: {
                    475:        struct roff     *r;
                    476:
1.98      schwarze  477:        r = mandoc_calloc(1, sizeof(struct roff));
1.128     kristaps  478:        r->parse = parse;
1.199     schwarze  479:        r->options = options;
1.227     schwarze  480:        r->format = options & (MPARSE_MDOC | MPARSE_MAN);
1.82      kristaps  481:        r->rstackpos = -1;
1.207     schwarze  482:
1.155     kristaps  483:        roffhash_init();
1.141     kristaps  484:
1.67      kristaps  485:        return(r);
                    486: }
                    487:
1.94      kristaps  488: /*
1.206     schwarze  489:  * In the current line, expand escape sequences that tend to get
                    490:  * used in numerical expressions and conditional requests.
                    491:  * Also check the syntax of the remaining escape sequences.
1.154     kristaps  492:  */
1.172     schwarze  493: static enum rofferr
1.142     kristaps  494: roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos)
1.94      kristaps  495: {
1.208     schwarze  496:        char             ubuf[24]; /* buffer to print the number */
1.205     schwarze  497:        const char      *start; /* start of the string to process */
1.209     schwarze  498:        char            *stesc; /* start of an escape sequence ('\\') */
1.108     schwarze  499:        const char      *stnam; /* start of the name, after "[(*" */
                    500:        const char      *cp;    /* end of the name, e.g. before ']' */
                    501:        const char      *res;   /* the string to be substituted */
1.181     schwarze  502:        char            *nbuf;  /* new buffer to copy bufp to */
                    503:        size_t           maxl;  /* expected length of the escape name */
                    504:        size_t           naml;  /* actual length of the escape name */
                    505:        int              expand_count;  /* to avoid infinite loops */
1.206     schwarze  506:        int              npos;  /* position in numeric expression */
1.218     schwarze  507:        int              arg_complete; /* argument not interrupted by eol */
1.206     schwarze  508:        char             term;  /* character terminating the escape */
1.94      kristaps  509:
1.170     schwarze  510:        expand_count = 0;
1.205     schwarze  511:        start = *bufp + pos;
                    512:        stesc = strchr(start, '\0') - 1;
                    513:        while (stesc-- > start) {
1.170     schwarze  514:
1.205     schwarze  515:                /* Search backwards for the next backslash. */
                    516:
                    517:                if ('\\' != *stesc)
                    518:                        continue;
                    519:
                    520:                /* If it is escaped, skip it. */
                    521:
                    522:                for (cp = stesc - 1; cp >= start; cp--)
                    523:                        if ('\\' != *cp)
                    524:                                break;
                    525:
                    526:                if (0 == (stesc - cp) % 2) {
1.209     schwarze  527:                        stesc = (char *)cp;
1.205     schwarze  528:                        continue;
                    529:                }
1.108     schwarze  530:
1.206     schwarze  531:                /* Decide whether to expand or to check only. */
1.108     schwarze  532:
1.206     schwarze  533:                term = '\0';
1.205     schwarze  534:                cp = stesc + 1;
1.181     schwarze  535:                switch (*cp) {
1.207     schwarze  536:                case '*':
1.181     schwarze  537:                        res = NULL;
                    538:                        break;
1.207     schwarze  539:                case 'B':
1.206     schwarze  540:                        /* FALLTHROUGH */
1.207     schwarze  541:                case 'w':
1.206     schwarze  542:                        term = cp[1];
                    543:                        /* FALLTHROUGH */
1.207     schwarze  544:                case 'n':
1.181     schwarze  545:                        res = ubuf;
                    546:                        break;
                    547:                default:
1.205     schwarze  548:                        if (ESCAPE_ERROR == mandoc_escape(&cp, NULL, NULL))
1.219     schwarze  549:                                mandoc_vmsg(MANDOCERR_ESC_BAD,
                    550:                                    r->parse, ln, (int)(stesc - *bufp),
                    551:                                    "%.*s", (int)(cp - stesc), stesc);
1.205     schwarze  552:                        continue;
1.152     kristaps  553:                }
                    554:
1.205     schwarze  555:                if (EXPAND_LIMIT < ++expand_count) {
                    556:                        mandoc_msg(MANDOCERR_ROFFLOOP, r->parse,
                    557:                            ln, (int)(stesc - *bufp), NULL);
                    558:                        return(ROFF_IGN);
                    559:                }
1.108     schwarze  560:
                    561:                /*
                    562:                 * The third character decides the length
1.181     schwarze  563:                 * of the name of the string or register.
1.108     schwarze  564:                 * Save a pointer to the name.
                    565:                 */
                    566:
1.206     schwarze  567:                if ('\0' == term) {
                    568:                        switch (*++cp) {
1.207     schwarze  569:                        case '\0':
1.206     schwarze  570:                                maxl = 0;
                    571:                                break;
1.207     schwarze  572:                        case '(':
1.206     schwarze  573:                                cp++;
                    574:                                maxl = 2;
                    575:                                break;
1.207     schwarze  576:                        case '[':
1.206     schwarze  577:                                cp++;
                    578:                                term = ']';
                    579:                                maxl = 0;
                    580:                                break;
                    581:                        default:
                    582:                                maxl = 1;
                    583:                                break;
                    584:                        }
                    585:                } else {
                    586:                        cp += 2;
1.94      kristaps  587:                        maxl = 0;
                    588:                }
1.108     schwarze  589:                stnam = cp;
1.94      kristaps  590:
1.108     schwarze  591:                /* Advance to the end of the name. */
1.94      kristaps  592:
1.218     schwarze  593:                arg_complete = 1;
1.181     schwarze  594:                for (naml = 0; 0 == maxl || naml < maxl; naml++, cp++) {
1.153     kristaps  595:                        if ('\0' == *cp) {
1.219     schwarze  596:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
                    597:                                    ln, (int)(stesc - *bufp), stesc);
1.218     schwarze  598:                                arg_complete = 0;
1.206     schwarze  599:                                break;
1.153     kristaps  600:                        }
1.206     schwarze  601:                        if (0 == maxl && *cp == term) {
                    602:                                cp++;
1.94      kristaps  603:                                break;
1.206     schwarze  604:                        }
1.94      kristaps  605:                }
                    606:
1.108     schwarze  607:                /*
                    608:                 * Retrieve the replacement string; if it is
                    609:                 * undefined, resume searching for escapes.
                    610:                 */
                    611:
1.206     schwarze  612:                switch (stesc[1]) {
1.207     schwarze  613:                case '*':
1.218     schwarze  614:                        if (arg_complete)
                    615:                                res = roff_getstrn(r, stnam, naml);
1.206     schwarze  616:                        break;
1.207     schwarze  617:                case 'B':
1.206     schwarze  618:                        npos = 0;
1.218     schwarze  619:                        ubuf[0] = arg_complete &&
                    620:                            roff_evalnum(stnam, &npos, NULL, 0) &&
                    621:                            stnam + npos + 1 == cp ? '1' : '0';
1.206     schwarze  622:                        ubuf[1] = '\0';
                    623:                        break;
1.207     schwarze  624:                case 'n':
1.218     schwarze  625:                        if (arg_complete)
                    626:                                (void)snprintf(ubuf, sizeof(ubuf), "%d",
                    627:                                    roff_getregn(r, stnam, naml));
                    628:                        else
                    629:                                ubuf[0] = '\0';
1.206     schwarze  630:                        break;
1.207     schwarze  631:                case 'w':
1.218     schwarze  632:                        /* use even incomplete args */
1.208     schwarze  633:                        (void)snprintf(ubuf, sizeof(ubuf), "%d",
1.206     schwarze  634:                            24 * (int)naml);
                    635:                        break;
                    636:                }
1.94      kristaps  637:
                    638:                if (NULL == res) {
1.219     schwarze  639:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
                    640:                            r->parse, ln, (int)(stesc - *bufp),
                    641:                            "%.*s", (int)naml, stnam);
1.142     kristaps  642:                        res = "";
1.94      kristaps  643:                }
                    644:
1.108     schwarze  645:                /* Replace the escape sequence by the string. */
                    646:
1.209     schwarze  647:                *stesc = '\0';
                    648:                *szp = mandoc_asprintf(&nbuf, "%s%s%s",
                    649:                    *bufp, res, cp) + 1;
1.94      kristaps  650:
1.205     schwarze  651:                /* Prepare for the next replacement. */
1.94      kristaps  652:
1.205     schwarze  653:                start = nbuf + pos;
1.209     schwarze  654:                stesc = nbuf + (stesc - *bufp) + strlen(res);
1.94      kristaps  655:                free(*bufp);
1.181     schwarze  656:                *bufp = nbuf;
1.154     kristaps  657:        }
1.172     schwarze  658:        return(ROFF_CONT);
1.154     kristaps  659: }
                    660:
                    661: /*
1.178     schwarze  662:  * Process text streams:
                    663:  * Convert all breakable hyphens into ASCII_HYPH.
                    664:  * Decrement and spring input line trap.
1.154     kristaps  665:  */
                    666: static enum rofferr
1.178     schwarze  667: roff_parsetext(char **bufp, size_t *szp, int pos, int *offs)
1.154     kristaps  668: {
                    669:        size_t           sz;
                    670:        const char      *start;
1.178     schwarze  671:        char            *p;
                    672:        int              isz;
1.154     kristaps  673:        enum mandoc_esc  esc;
                    674:
1.178     schwarze  675:        start = p = *bufp + pos;
1.154     kristaps  676:
                    677:        while ('\0' != *p) {
                    678:                sz = strcspn(p, "-\\");
                    679:                p += sz;
                    680:
1.159     kristaps  681:                if ('\0' == *p)
                    682:                        break;
                    683:
1.154     kristaps  684:                if ('\\' == *p) {
                    685:                        /* Skip over escapes. */
                    686:                        p++;
1.189     schwarze  687:                        esc = mandoc_escape((const char **)&p, NULL, NULL);
1.154     kristaps  688:                        if (ESCAPE_ERROR == esc)
                    689:                                break;
1.155     kristaps  690:                        continue;
1.159     kristaps  691:                } else if (p == start) {
1.158     kristaps  692:                        p++;
1.155     kristaps  693:                        continue;
1.158     kristaps  694:                }
1.155     kristaps  695:
1.171     schwarze  696:                if (isalpha((unsigned char)p[-1]) &&
                    697:                    isalpha((unsigned char)p[1]))
1.155     kristaps  698:                        *p = ASCII_HYPH;
                    699:                p++;
1.94      kristaps  700:        }
                    701:
1.178     schwarze  702:        /* Spring the input line trap. */
                    703:        if (1 == roffit_lines) {
1.202     schwarze  704:                isz = mandoc_asprintf(&p, "%s\n.%s", *bufp, roffit_macro);
1.178     schwarze  705:                free(*bufp);
                    706:                *bufp = p;
                    707:                *szp = isz + 1;
                    708:                *offs = 0;
                    709:                free(roffit_macro);
                    710:                roffit_lines = 0;
                    711:                return(ROFF_REPARSE);
                    712:        } else if (1 < roffit_lines)
                    713:                --roffit_lines;
1.154     kristaps  714:        return(ROFF_CONT);
1.94      kristaps  715: }
                    716:
1.67      kristaps  717: enum rofferr
1.207     schwarze  718: roff_parseln(struct roff *r, int ln, char **bufp,
1.90      kristaps  719:                size_t *szp, int pos, int *offs)
1.67      kristaps  720: {
                    721:        enum rofft       t;
1.109     kristaps  722:        enum rofferr     e;
1.130     kristaps  723:        int              ppos, ctl;
1.79      kristaps  724:
                    725:        /*
1.94      kristaps  726:         * Run the reserved-word filter only if we have some reserved
                    727:         * words to fill in.
                    728:         */
                    729:
1.172     schwarze  730:        e = roff_res(r, bufp, szp, ln, pos);
                    731:        if (ROFF_IGN == e)
                    732:                return(e);
                    733:        assert(ROFF_CONT == e);
1.94      kristaps  734:
1.130     kristaps  735:        ppos = pos;
1.174     kristaps  736:        ctl = roff_getcontrol(r, *bufp, &pos);
1.130     kristaps  737:
1.94      kristaps  738:        /*
1.79      kristaps  739:         * First, if a scope is open and we're not a macro, pass the
                    740:         * text through the macro's filter.  If a scope isn't open and
                    741:         * we're not a macro, just let it through.
1.125     kristaps  742:         * Finally, if there's an equation scope open, divert it into it
                    743:         * no matter our state.
1.79      kristaps  744:         */
1.74      kristaps  745:
1.130     kristaps  746:        if (r->last && ! ctl) {
1.78      kristaps  747:                t = r->last->tok;
                    748:                assert(roffs[t].text);
1.207     schwarze  749:                e = (*roffs[t].text)(r, t, bufp, szp, ln, pos, pos, offs);
1.109     kristaps  750:                assert(ROFF_IGN == e || ROFF_CONT == e);
1.125     kristaps  751:                if (ROFF_CONT != e)
                    752:                        return(e);
1.182     schwarze  753:        }
                    754:        if (r->eqn)
                    755:                return(eqn_read(&r->eqn, ln, *bufp, ppos, offs));
                    756:        if ( ! ctl) {
1.125     kristaps  757:                if (r->tbl)
1.130     kristaps  758:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.178     schwarze  759:                return(roff_parsetext(bufp, szp, pos, offs));
1.182     schwarze  760:        }
1.228   ! schwarze  761:
        !           762:        /* Skip empty request lines. */
        !           763:
        !           764:        if ((*bufp)[pos] == '"') {
        !           765:                mandoc_msg(MANDOCERR_COMMENT_BAD, r->parse,
        !           766:                    ln, pos, NULL);
        !           767:                return(ROFF_IGN);
        !           768:        } else if ((*bufp)[pos] == '\0')
        !           769:                return(ROFF_IGN);
1.67      kristaps  770:
1.79      kristaps  771:        /*
                    772:         * If a scope is open, go to the child handler for that macro,
                    773:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  774:         * Don't do so if an equation is open.
1.79      kristaps  775:         */
1.78      kristaps  776:
1.79      kristaps  777:        if (r->last) {
                    778:                t = r->last->tok;
                    779:                assert(roffs[t].sub);
1.207     schwarze  780:                return((*roffs[t].sub)(r, t, bufp, szp,
                    781:                    ln, ppos, pos, offs));
1.79      kristaps  782:        }
1.78      kristaps  783:
1.79      kristaps  784:        /*
                    785:         * Lastly, as we've no scope open, try to look up and execute
                    786:         * the new macro.  If no macro is found, simply return and let
                    787:         * the compilers handle it.
                    788:         */
1.67      kristaps  789:
1.214     schwarze  790:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos, ln, ppos)))
1.79      kristaps  791:                return(ROFF_CONT);
1.67      kristaps  792:
1.75      kristaps  793:        assert(roffs[t].proc);
1.207     schwarze  794:        return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs));
1.74      kristaps  795: }
                    796:
1.117     kristaps  797: void
1.74      kristaps  798: roff_endparse(struct roff *r)
                    799: {
                    800:
1.110     kristaps  801:        if (r->last)
1.221     schwarze  802:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    803:                    r->last->line, r->last->col,
                    804:                    roffs[r->last->tok].name);
1.117     kristaps  805:
1.125     kristaps  806:        if (r->eqn) {
1.221     schwarze  807:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    808:                    r->eqn->eqn.ln, r->eqn->eqn.pos, "EQ");
1.151     kristaps  809:                eqn_end(&r->eqn);
1.125     kristaps  810:        }
                    811:
1.117     kristaps  812:        if (r->tbl) {
1.221     schwarze  813:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    814:                    r->tbl->line, r->tbl->pos, "TS");
1.151     kristaps  815:                tbl_end(&r->tbl);
1.117     kristaps  816:        }
1.67      kristaps  817: }
                    818:
                    819: /*
                    820:  * Parse a roff node's type from the input buffer.  This must be in the
                    821:  * form of ".foo xxx" in the usual way.
                    822:  */
                    823: static enum rofft
1.214     schwarze  824: roff_parse(struct roff *r, char *buf, int *pos, int ln, int ppos)
1.67      kristaps  825: {
1.214     schwarze  826:        char            *cp;
1.106     kristaps  827:        const char      *mac;
                    828:        size_t           maclen;
1.67      kristaps  829:        enum rofft       t;
                    830:
1.214     schwarze  831:        cp = buf + *pos;
                    832:
                    833:        if ('\0' == *cp || '"' == *cp || '\t' == *cp || ' ' == *cp)
1.67      kristaps  834:                return(ROFF_MAX);
                    835:
1.214     schwarze  836:        mac = cp;
                    837:        maclen = roff_getname(r, &cp, ln, ppos);
1.67      kristaps  838:
1.106     kristaps  839:        t = (r->current_string = roff_getstrn(r, mac, maclen))
1.155     kristaps  840:            ? ROFF_USERDEF : roffhash_find(mac, maclen);
1.67      kristaps  841:
1.214     schwarze  842:        if (ROFF_MAX != t)
                    843:                *pos = cp - buf;
1.67      kristaps  844:
                    845:        return(t);
                    846: }
                    847:
                    848: static enum rofferr
1.76      kristaps  849: roff_cblock(ROFF_ARGS)
1.67      kristaps  850: {
                    851:
1.79      kristaps  852:        /*
                    853:         * A block-close `..' should only be invoked as a child of an
                    854:         * ignore macro, otherwise raise a warning and just ignore it.
                    855:         */
                    856:
1.76      kristaps  857:        if (NULL == r->last) {
1.221     schwarze  858:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    859:                    ln, ppos, "..");
1.76      kristaps  860:                return(ROFF_IGN);
                    861:        }
1.67      kristaps  862:
1.81      kristaps  863:        switch (r->last->tok) {
1.207     schwarze  864:        case ROFF_am:
1.220     schwarze  865:                /* ROFF_am1 is remapped to ROFF_am in roff_block(). */
1.81      kristaps  866:                /* FALLTHROUGH */
1.207     schwarze  867:        case ROFF_ami:
1.81      kristaps  868:                /* FALLTHROUGH */
1.207     schwarze  869:        case ROFF_de:
1.108     schwarze  870:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  871:                /* FALLTHROUGH */
1.207     schwarze  872:        case ROFF_dei:
1.81      kristaps  873:                /* FALLTHROUGH */
1.207     schwarze  874:        case ROFF_ig:
1.81      kristaps  875:                break;
                    876:        default:
1.221     schwarze  877:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    878:                    ln, ppos, "..");
1.67      kristaps  879:                return(ROFF_IGN);
1.76      kristaps  880:        }
1.67      kristaps  881:
1.76      kristaps  882:        if ((*bufp)[pos])
1.217     schwarze  883:                mandoc_vmsg(MANDOCERR_ARG_SKIP, r->parse, ln, pos,
                    884:                    ".. %s", *bufp + pos);
1.71      kristaps  885:
                    886:        roffnode_pop(r);
1.76      kristaps  887:        roffnode_cleanscope(r);
                    888:        return(ROFF_IGN);
1.71      kristaps  889:
1.67      kristaps  890: }
                    891:
1.76      kristaps  892: static void
                    893: roffnode_cleanscope(struct roff *r)
1.67      kristaps  894: {
                    895:
1.76      kristaps  896:        while (r->last) {
1.173     schwarze  897:                if (--r->last->endspan != 0)
1.76      kristaps  898:                        break;
                    899:                roffnode_pop(r);
                    900:        }
1.67      kristaps  901: }
                    902:
1.195     schwarze  903: static void
                    904: roff_ccond(struct roff *r, int ln, int ppos)
1.74      kristaps  905: {
                    906:
1.76      kristaps  907:        if (NULL == r->last) {
1.221     schwarze  908:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    909:                    ln, ppos, "\\}");
1.195     schwarze  910:                return;
1.76      kristaps  911:        }
                    912:
1.82      kristaps  913:        switch (r->last->tok) {
1.207     schwarze  914:        case ROFF_el:
1.82      kristaps  915:                /* FALLTHROUGH */
1.207     schwarze  916:        case ROFF_ie:
1.82      kristaps  917:                /* FALLTHROUGH */
1.207     schwarze  918:        case ROFF_if:
1.82      kristaps  919:                break;
                    920:        default:
1.221     schwarze  921:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    922:                    ln, ppos, "\\}");
1.195     schwarze  923:                return;
1.75      kristaps  924:        }
                    925:
1.76      kristaps  926:        if (r->last->endspan > -1) {
1.221     schwarze  927:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    928:                    ln, ppos, "\\}");
1.195     schwarze  929:                return;
1.76      kristaps  930:        }
                    931:
1.75      kristaps  932:        roffnode_pop(r);
1.76      kristaps  933:        roffnode_cleanscope(r);
1.195     schwarze  934:        return;
1.76      kristaps  935: }
                    936:
                    937: static enum rofferr
1.80      kristaps  938: roff_block(ROFF_ARGS)
1.76      kristaps  939: {
1.220     schwarze  940:        const char      *name;
                    941:        char            *iname, *cp;
1.213     schwarze  942:        size_t           namesz;
1.106     kristaps  943:
1.220     schwarze  944:        /* Ignore groff compatibility mode for now. */
1.76      kristaps  945:
1.220     schwarze  946:        if (ROFF_de1 == tok)
                    947:                tok = ROFF_de;
                    948:        else if (ROFF_am1 == tok)
                    949:                tok = ROFF_am;
                    950:
                    951:        /* Parse the macro name argument. */
                    952:
                    953:        cp = *bufp + pos;
                    954:        if (ROFF_ig == tok) {
                    955:                iname = NULL;
                    956:                namesz = 0;
                    957:        } else {
                    958:                iname = cp;
                    959:                namesz = roff_getname(r, &cp, ln, ppos);
                    960:                iname[namesz] = '\0';
                    961:        }
1.107     kristaps  962:
1.220     schwarze  963:        /* Resolve the macro name argument if it is indirect. */
1.107     kristaps  964:
1.220     schwarze  965:        if (namesz && (ROFF_dei == tok || ROFF_ami == tok)) {
                    966:                if (NULL == (name = roff_getstrn(r, iname, namesz))) {
                    967:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
                    968:                            r->parse, ln, (int)(iname - *bufp),
                    969:                            "%.*s", (int)namesz, iname);
                    970:                        namesz = 0;
                    971:                } else
                    972:                        namesz = strlen(name);
                    973:        } else
                    974:                name = iname;
1.107     kristaps  975:
1.220     schwarze  976:        if (0 == namesz && ROFF_ig != tok) {
                    977:                mandoc_msg(MANDOCERR_REQ_EMPTY, r->parse,
                    978:                    ln, ppos, roffs[tok].name);
                    979:                return(ROFF_IGN);
                    980:        }
1.80      kristaps  981:
1.106     kristaps  982:        roffnode_push(r, tok, name, ln, ppos);
                    983:
                    984:        /*
                    985:         * At the beginning of a `de' macro, clear the existing string
                    986:         * with the same name, if there is one.  New content will be
1.193     schwarze  987:         * appended from roff_block_text() in multiline mode.
1.106     kristaps  988:         */
1.107     kristaps  989:
1.220     schwarze  990:        if (ROFF_de == tok || ROFF_dei == tok)
1.213     schwarze  991:                roff_setstrn(&r->strtab, name, namesz, "", 0, 0);
1.76      kristaps  992:
1.213     schwarze  993:        if ('\0' == *cp)
1.78      kristaps  994:                return(ROFF_IGN);
                    995:
1.220     schwarze  996:        /* Get the custom end marker. */
1.107     kristaps  997:
1.220     schwarze  998:        iname = cp;
1.213     schwarze  999:        namesz = roff_getname(r, &cp, ln, ppos);
1.220     schwarze 1000:
                   1001:        /* Resolve the end marker if it is indirect. */
                   1002:
                   1003:        if (namesz && (ROFF_dei == tok || ROFF_ami == tok)) {
                   1004:                if (NULL == (name = roff_getstrn(r, iname, namesz))) {
                   1005:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
                   1006:                            r->parse, ln, (int)(iname - *bufp),
                   1007:                            "%.*s", (int)namesz, iname);
                   1008:                        namesz = 0;
                   1009:                } else
                   1010:                        namesz = strlen(name);
                   1011:        } else
                   1012:                name = iname;
                   1013:
1.213     schwarze 1014:        if (namesz)
                   1015:                r->last->end = mandoc_strndup(name, namesz);
1.78      kristaps 1016:
1.213     schwarze 1017:        if ('\0' != *cp)
1.217     schwarze 1018:                mandoc_vmsg(MANDOCERR_ARG_EXCESS, r->parse,
                   1019:                    ln, pos, ".%s ... %s", roffs[tok].name, cp);
1.74      kristaps 1020:
1.78      kristaps 1021:        return(ROFF_IGN);
                   1022: }
                   1023:
                   1024: static enum rofferr
1.80      kristaps 1025: roff_block_sub(ROFF_ARGS)
1.79      kristaps 1026: {
                   1027:        enum rofft      t;
                   1028:        int             i, j;
                   1029:
                   1030:        /*
                   1031:         * First check whether a custom macro exists at this level.  If
                   1032:         * it does, then check against it.  This is some of groff's
                   1033:         * stranger behaviours.  If we encountered a custom end-scope
                   1034:         * tag and that tag also happens to be a "real" macro, then we
                   1035:         * need to try interpreting it again as a real macro.  If it's
                   1036:         * not, then return ignore.  Else continue.
                   1037:         */
                   1038:
                   1039:        if (r->last->end) {
1.130     kristaps 1040:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.79      kristaps 1041:                        if ((*bufp)[i] != r->last->end[j])
                   1042:                                break;
                   1043:
1.207     schwarze 1044:                if ('\0' == r->last->end[j] &&
                   1045:                    ('\0' == (*bufp)[i] ||
                   1046:                     ' '  == (*bufp)[i] ||
                   1047:                     '\t' == (*bufp)[i])) {
1.79      kristaps 1048:                        roffnode_pop(r);
                   1049:                        roffnode_cleanscope(r);
                   1050:
1.130     kristaps 1051:                        while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
                   1052:                                i++;
                   1053:
                   1054:                        pos = i;
1.214     schwarze 1055:                        if (ROFF_MAX != roff_parse(r, *bufp, &pos, ln, ppos))
1.79      kristaps 1056:                                return(ROFF_RERUN);
                   1057:                        return(ROFF_IGN);
                   1058:                }
                   1059:        }
                   1060:
                   1061:        /*
                   1062:         * If we have no custom end-query or lookup failed, then try
                   1063:         * pulling it out of the hashtable.
                   1064:         */
                   1065:
1.214     schwarze 1066:        t = roff_parse(r, *bufp, &pos, ln, ppos);
1.79      kristaps 1067:
1.106     kristaps 1068:        if (ROFF_cblock != t) {
1.220     schwarze 1069:                if (ROFF_ig != tok)
1.193     schwarze 1070:                        roff_setstr(r, r->last->name, *bufp + ppos, 2);
1.79      kristaps 1071:                return(ROFF_IGN);
1.106     kristaps 1072:        }
1.79      kristaps 1073:
                   1074:        assert(roffs[t].proc);
1.207     schwarze 1075:        return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs));
1.79      kristaps 1076: }
                   1077:
                   1078: static enum rofferr
1.80      kristaps 1079: roff_block_text(ROFF_ARGS)
1.78      kristaps 1080: {
                   1081:
1.220     schwarze 1082:        if (ROFF_ig != tok)
1.193     schwarze 1083:                roff_setstr(r, r->last->name, *bufp + pos, 2);
1.106     kristaps 1084:
1.78      kristaps 1085:        return(ROFF_IGN);
                   1086: }
                   1087:
                   1088: static enum rofferr
1.82      kristaps 1089: roff_cond_sub(ROFF_ARGS)
                   1090: {
                   1091:        enum rofft       t;
1.139     kristaps 1092:        char            *ep;
1.198     schwarze 1093:        int              rr;
1.82      kristaps 1094:
                   1095:        rr = r->last->rule;
1.139     kristaps 1096:        roffnode_cleanscope(r);
1.214     schwarze 1097:        t = roff_parse(r, *bufp, &pos, ln, ppos);
1.82      kristaps 1098:
1.139     kristaps 1099:        /*
1.177     schwarze 1100:         * Fully handle known macros when they are structurally
                   1101:         * required or when the conditional evaluated to true.
1.87      kristaps 1102:         */
                   1103:
1.177     schwarze 1104:        if ((ROFF_MAX != t) &&
1.198     schwarze 1105:            (rr || ROFFMAC_STRUCT & roffs[t].flags)) {
1.177     schwarze 1106:                assert(roffs[t].proc);
                   1107:                return((*roffs[t].proc)(r, t, bufp, szp,
1.207     schwarze 1108:                    ln, ppos, pos, offs));
1.177     schwarze 1109:        }
1.144     kristaps 1110:
1.196     schwarze 1111:        /*
                   1112:         * If `\}' occurs on a macro line without a preceding macro,
                   1113:         * drop the line completely.
                   1114:         */
                   1115:
                   1116:        ep = *bufp + pos;
                   1117:        if ('\\' == ep[0] && '}' == ep[1])
1.198     schwarze 1118:                rr = 0;
1.196     schwarze 1119:
1.177     schwarze 1120:        /* Always check for the closing delimiter `\}'. */
1.144     kristaps 1121:
1.177     schwarze 1122:        while (NULL != (ep = strchr(ep, '\\'))) {
1.197     schwarze 1123:                if ('}' == *(++ep)) {
                   1124:                        *ep = '&';
                   1125:                        roff_ccond(r, ln, ep - *bufp - 1);
                   1126:                }
                   1127:                ++ep;
1.177     schwarze 1128:        }
1.198     schwarze 1129:        return(rr ? ROFF_CONT : ROFF_IGN);
1.82      kristaps 1130: }
                   1131:
                   1132: static enum rofferr
                   1133: roff_cond_text(ROFF_ARGS)
1.78      kristaps 1134: {
1.140     kristaps 1135:        char            *ep;
1.198     schwarze 1136:        int              rr;
1.82      kristaps 1137:
                   1138:        rr = r->last->rule;
1.140     kristaps 1139:        roffnode_cleanscope(r);
1.82      kristaps 1140:
1.197     schwarze 1141:        ep = *bufp + pos;
                   1142:        while (NULL != (ep = strchr(ep, '\\'))) {
                   1143:                if ('}' == *(++ep)) {
                   1144:                        *ep = '&';
                   1145:                        roff_ccond(r, ln, ep - *bufp - 1);
                   1146:                }
                   1147:                ++ep;
1.78      kristaps 1148:        }
1.198     schwarze 1149:        return(rr ? ROFF_CONT : ROFF_IGN);
1.74      kristaps 1150: }
                   1151:
1.204     schwarze 1152: /*
                   1153:  * Parse a single signed integer number.  Stop at the first non-digit.
                   1154:  * If there is at least one digit, return success and advance the
                   1155:  * parse point, else return failure and let the parse point unchanged.
                   1156:  * Ignore overflows, treat them just like the C language.
                   1157:  */
1.184     schwarze 1158: static int
                   1159: roff_getnum(const char *v, int *pos, int *res)
                   1160: {
1.206     schwarze 1161:        int      myres, n, p;
                   1162:
                   1163:        if (NULL == res)
                   1164:                res = &myres;
1.184     schwarze 1165:
                   1166:        p = *pos;
                   1167:        n = v[p] == '-';
                   1168:        if (n)
                   1169:                p++;
                   1170:
                   1171:        for (*res = 0; isdigit((unsigned char)v[p]); p++)
1.204     schwarze 1172:                *res = 10 * *res + v[p] - '0';
1.184     schwarze 1173:        if (p == *pos + n)
                   1174:                return 0;
                   1175:
                   1176:        if (n)
                   1177:                *res = -*res;
                   1178:
                   1179:        *pos = p;
                   1180:        return 1;
                   1181: }
                   1182:
1.198     schwarze 1183: /*
                   1184:  * Evaluate a string comparison condition.
                   1185:  * The first character is the delimiter.
                   1186:  * Succeed if the string up to its second occurrence
                   1187:  * matches the string up to its third occurence.
                   1188:  * Advance the cursor after the third occurrence
                   1189:  * or lacking that, to the end of the line.
                   1190:  */
                   1191: static int
                   1192: roff_evalstrcond(const char *v, int *pos)
                   1193: {
                   1194:        const char      *s1, *s2, *s3;
                   1195:        int              match;
                   1196:
                   1197:        match = 0;
                   1198:        s1 = v + *pos;          /* initial delimiter */
                   1199:        s2 = s1 + 1;            /* for scanning the first string */
                   1200:        s3 = strchr(s2, *s1);   /* for scanning the second string */
                   1201:
                   1202:        if (NULL == s3)         /* found no middle delimiter */
                   1203:                goto out;
                   1204:
                   1205:        while ('\0' != *++s3) {
                   1206:                if (*s2 != *s3) {  /* mismatch */
                   1207:                        s3 = strchr(s3, *s1);
                   1208:                        break;
                   1209:                }
                   1210:                if (*s3 == *s1) {  /* found the final delimiter */
                   1211:                        match = 1;
                   1212:                        break;
                   1213:                }
                   1214:                s2++;
                   1215:        }
                   1216:
                   1217: out:
                   1218:        if (NULL == s3)
                   1219:                s3 = strchr(s2, '\0');
                   1220:        else
                   1221:                s3++;
                   1222:        *pos = s3 - v;
                   1223:        return(match);
                   1224: }
                   1225:
1.204     schwarze 1226: /*
                   1227:  * Evaluate an optionally negated single character, numerical,
                   1228:  * or string condition.
                   1229:  */
1.198     schwarze 1230: static int
1.88      kristaps 1231: roff_evalcond(const char *v, int *pos)
                   1232: {
1.204     schwarze 1233:        int      wanttrue, number;
1.88      kristaps 1234:
1.198     schwarze 1235:        if ('!' == v[*pos]) {
                   1236:                wanttrue = 0;
                   1237:                (*pos)++;
                   1238:        } else
                   1239:                wanttrue = 1;
                   1240:
1.88      kristaps 1241:        switch (v[*pos]) {
1.207     schwarze 1242:        case 'n':
1.198     schwarze 1243:                /* FALLTHROUGH */
1.207     schwarze 1244:        case 'o':
1.88      kristaps 1245:                (*pos)++;
1.198     schwarze 1246:                return(wanttrue);
1.207     schwarze 1247:        case 'c':
1.198     schwarze 1248:                /* FALLTHROUGH */
1.207     schwarze 1249:        case 'd':
1.198     schwarze 1250:                /* FALLTHROUGH */
1.207     schwarze 1251:        case 'e':
1.88      kristaps 1252:                /* FALLTHROUGH */
1.207     schwarze 1253:        case 'r':
1.88      kristaps 1254:                /* FALLTHROUGH */
1.207     schwarze 1255:        case 't':
1.88      kristaps 1256:                (*pos)++;
1.198     schwarze 1257:                return(!wanttrue);
1.88      kristaps 1258:        default:
                   1259:                break;
                   1260:        }
                   1261:
1.204     schwarze 1262:        if (roff_evalnum(v, pos, &number, 0))
                   1263:                return((number > 0) == wanttrue);
                   1264:        else
1.198     schwarze 1265:                return(roff_evalstrcond(v, pos) == wanttrue);
1.88      kristaps 1266: }
                   1267:
1.74      kristaps 1268: static enum rofferr
1.103     kristaps 1269: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1270: {
1.123     schwarze 1271:
1.89      kristaps 1272:        return(ROFF_IGN);
                   1273: }
                   1274:
1.104     kristaps 1275: static enum rofferr
1.82      kristaps 1276: roff_cond(ROFF_ARGS)
1.74      kristaps 1277: {
1.173     schwarze 1278:
                   1279:        roffnode_push(r, tok, NULL, ln, ppos);
1.74      kristaps 1280:
1.207     schwarze 1281:        /*
1.134     kristaps 1282:         * An `.el' has no conditional body: it will consume the value
                   1283:         * of the current rstack entry set in prior `ie' calls or
1.207     schwarze 1284:         * defaults to DENY.
1.134     kristaps 1285:         *
                   1286:         * If we're not an `el', however, then evaluate the conditional.
                   1287:         */
1.133     kristaps 1288:
1.173     schwarze 1289:        r->last->rule = ROFF_el == tok ?
1.207     schwarze 1290:            (r->rstackpos < 0 ? 0 : r->rstack[r->rstackpos--]) :
                   1291:            roff_evalcond(*bufp, &pos);
1.77      kristaps 1292:
1.134     kristaps 1293:        /*
                   1294:         * An if-else will put the NEGATION of the current evaluated
                   1295:         * conditional into the stack of rules.
                   1296:         */
                   1297:
1.84      schwarze 1298:        if (ROFF_ie == tok) {
1.223     schwarze 1299:                if (r->rstackpos + 1 == r->rstacksz) {
                   1300:                        r->rstacksz += 16;
                   1301:                        r->rstack = mandoc_reallocarray(r->rstack,
                   1302:                            r->rstacksz, sizeof(int));
1.134     kristaps 1303:                }
1.198     schwarze 1304:                r->rstack[++r->rstackpos] = !r->last->rule;
1.82      kristaps 1305:        }
1.88      kristaps 1306:
                   1307:        /* If the parent has false as its rule, then so do we. */
                   1308:
1.198     schwarze 1309:        if (r->last->parent && !r->last->parent->rule)
                   1310:                r->last->rule = 0;
1.88      kristaps 1311:
                   1312:        /*
1.173     schwarze 1313:         * Determine scope.
                   1314:         * If there is nothing on the line after the conditional,
                   1315:         * not even whitespace, use next-line scope.
1.88      kristaps 1316:         */
1.74      kristaps 1317:
1.173     schwarze 1318:        if ('\0' == (*bufp)[pos]) {
                   1319:                r->last->endspan = 2;
                   1320:                goto out;
                   1321:        }
                   1322:
                   1323:        while (' ' == (*bufp)[pos])
                   1324:                pos++;
                   1325:
                   1326:        /* An opening brace requests multiline scope. */
1.75      kristaps 1327:
                   1328:        if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
                   1329:                r->last->endspan = -1;
                   1330:                pos += 2;
1.173     schwarze 1331:                goto out;
1.207     schwarze 1332:        }
1.74      kristaps 1333:
1.77      kristaps 1334:        /*
1.173     schwarze 1335:         * Anything else following the conditional causes
                   1336:         * single-line scope.  Warn if the scope contains
                   1337:         * nothing but trailing whitespace.
1.77      kristaps 1338:         */
                   1339:
1.75      kristaps 1340:        if ('\0' == (*bufp)[pos])
1.216     schwarze 1341:                mandoc_msg(MANDOCERR_COND_EMPTY, r->parse,
                   1342:                    ln, ppos, roffs[tok].name);
1.77      kristaps 1343:
1.173     schwarze 1344:        r->last->endspan = 1;
1.74      kristaps 1345:
1.173     schwarze 1346: out:
1.75      kristaps 1347:        *offs = pos;
                   1348:        return(ROFF_RERUN);
1.83      schwarze 1349: }
                   1350:
                   1351: static enum rofferr
1.92      schwarze 1352: roff_ds(ROFF_ARGS)
                   1353: {
1.212     schwarze 1354:        char            *string;
                   1355:        const char      *name;
                   1356:        size_t           namesz;
1.96      kristaps 1357:
                   1358:        /*
1.212     schwarze 1359:         * The first word is the name of the string.
                   1360:         * If it is empty or terminated by an escape sequence,
                   1361:         * abort the `ds' request without defining anything.
1.96      kristaps 1362:         */
1.92      schwarze 1363:
1.212     schwarze 1364:        name = string = *bufp + pos;
1.92      schwarze 1365:        if ('\0' == *name)
                   1366:                return(ROFF_IGN);
                   1367:
1.212     schwarze 1368:        namesz = roff_getname(r, &string, ln, pos);
                   1369:        if ('\\' == name[namesz])
                   1370:                return(ROFF_IGN);
                   1371:
                   1372:        /* Read past the initial double-quote, if any. */
1.121     schwarze 1373:        if ('"' == *string)
1.92      schwarze 1374:                string++;
                   1375:
1.96      kristaps 1376:        /* The rest is the value. */
1.212     schwarze 1377:        roff_setstrn(&r->strtab, name, namesz, string, strlen(string),
                   1378:            ROFF_as == tok);
1.92      schwarze 1379:        return(ROFF_IGN);
                   1380: }
                   1381:
1.204     schwarze 1382: /*
                   1383:  * Parse a single operator, one or two characters long.
                   1384:  * If the operator is recognized, return success and advance the
                   1385:  * parse point, else return failure and let the parse point unchanged.
                   1386:  */
                   1387: static int
                   1388: roff_getop(const char *v, int *pos, char *res)
                   1389: {
                   1390:
                   1391:        *res = v[*pos];
                   1392:
                   1393:        switch (*res) {
1.207     schwarze 1394:        case '+':
1.204     schwarze 1395:                /* FALLTHROUGH */
1.207     schwarze 1396:        case '-':
1.204     schwarze 1397:                /* FALLTHROUGH */
1.207     schwarze 1398:        case '*':
1.204     schwarze 1399:                /* FALLTHROUGH */
1.207     schwarze 1400:        case '/':
1.204     schwarze 1401:                /* FALLTHROUGH */
1.207     schwarze 1402:        case '%':
1.204     schwarze 1403:                /* FALLTHROUGH */
1.207     schwarze 1404:        case '&':
1.204     schwarze 1405:                /* FALLTHROUGH */
1.207     schwarze 1406:        case ':':
1.204     schwarze 1407:                break;
                   1408:        case '<':
                   1409:                switch (v[*pos + 1]) {
1.207     schwarze 1410:                case '=':
1.204     schwarze 1411:                        *res = 'l';
                   1412:                        (*pos)++;
                   1413:                        break;
1.207     schwarze 1414:                case '>':
1.204     schwarze 1415:                        *res = '!';
                   1416:                        (*pos)++;
                   1417:                        break;
1.207     schwarze 1418:                case '?':
1.204     schwarze 1419:                        *res = 'i';
                   1420:                        (*pos)++;
                   1421:                        break;
                   1422:                default:
                   1423:                        break;
                   1424:                }
                   1425:                break;
                   1426:        case '>':
                   1427:                switch (v[*pos + 1]) {
1.207     schwarze 1428:                case '=':
1.204     schwarze 1429:                        *res = 'g';
                   1430:                        (*pos)++;
                   1431:                        break;
1.207     schwarze 1432:                case '?':
1.204     schwarze 1433:                        *res = 'a';
                   1434:                        (*pos)++;
                   1435:                        break;
                   1436:                default:
                   1437:                        break;
                   1438:                }
                   1439:                break;
                   1440:        case '=':
                   1441:                if ('=' == v[*pos + 1])
                   1442:                        (*pos)++;
                   1443:                break;
                   1444:        default:
                   1445:                return(0);
                   1446:        }
                   1447:        (*pos)++;
                   1448:
                   1449:        return(*res);
                   1450: }
                   1451:
                   1452: /*
                   1453:  * Evaluate either a parenthesized numeric expression
                   1454:  * or a single signed integer number.
                   1455:  */
                   1456: static int
                   1457: roff_evalpar(const char *v, int *pos, int *res)
                   1458: {
                   1459:
                   1460:        if ('(' != v[*pos])
                   1461:                return(roff_getnum(v, pos, res));
                   1462:
                   1463:        (*pos)++;
                   1464:        if ( ! roff_evalnum(v, pos, res, 1))
                   1465:                return(0);
                   1466:
1.206     schwarze 1467:        /*
                   1468:         * Omission of the closing parenthesis
                   1469:         * is an error in validation mode,
                   1470:         * but ignored in evaluation mode.
                   1471:         */
                   1472:
1.204     schwarze 1473:        if (')' == v[*pos])
                   1474:                (*pos)++;
1.206     schwarze 1475:        else if (NULL == res)
                   1476:                return(0);
1.204     schwarze 1477:
                   1478:        return(1);
                   1479: }
                   1480:
                   1481: /*
                   1482:  * Evaluate a complete numeric expression.
                   1483:  * Proceed left to right, there is no concept of precedence.
                   1484:  */
                   1485: static int
                   1486: roff_evalnum(const char *v, int *pos, int *res, int skipwhite)
                   1487: {
                   1488:        int              mypos, operand2;
                   1489:        char             operator;
                   1490:
                   1491:        if (NULL == pos) {
                   1492:                mypos = 0;
                   1493:                pos = &mypos;
                   1494:        }
                   1495:
                   1496:        if (skipwhite)
                   1497:                while (isspace((unsigned char)v[*pos]))
                   1498:                        (*pos)++;
                   1499:
                   1500:        if ( ! roff_evalpar(v, pos, res))
                   1501:                return(0);
                   1502:
                   1503:        while (1) {
                   1504:                if (skipwhite)
                   1505:                        while (isspace((unsigned char)v[*pos]))
                   1506:                                (*pos)++;
                   1507:
                   1508:                if ( ! roff_getop(v, pos, &operator))
                   1509:                        break;
                   1510:
                   1511:                if (skipwhite)
                   1512:                        while (isspace((unsigned char)v[*pos]))
                   1513:                                (*pos)++;
                   1514:
                   1515:                if ( ! roff_evalpar(v, pos, &operand2))
                   1516:                        return(0);
                   1517:
                   1518:                if (skipwhite)
                   1519:                        while (isspace((unsigned char)v[*pos]))
                   1520:                                (*pos)++;
1.206     schwarze 1521:
                   1522:                if (NULL == res)
                   1523:                        continue;
1.204     schwarze 1524:
                   1525:                switch (operator) {
1.207     schwarze 1526:                case '+':
1.204     schwarze 1527:                        *res += operand2;
                   1528:                        break;
1.207     schwarze 1529:                case '-':
1.204     schwarze 1530:                        *res -= operand2;
                   1531:                        break;
1.207     schwarze 1532:                case '*':
1.204     schwarze 1533:                        *res *= operand2;
                   1534:                        break;
1.207     schwarze 1535:                case '/':
1.204     schwarze 1536:                        *res /= operand2;
                   1537:                        break;
1.207     schwarze 1538:                case '%':
1.204     schwarze 1539:                        *res %= operand2;
                   1540:                        break;
1.207     schwarze 1541:                case '<':
1.204     schwarze 1542:                        *res = *res < operand2;
                   1543:                        break;
1.207     schwarze 1544:                case '>':
1.204     schwarze 1545:                        *res = *res > operand2;
                   1546:                        break;
1.207     schwarze 1547:                case 'l':
1.204     schwarze 1548:                        *res = *res <= operand2;
                   1549:                        break;
1.207     schwarze 1550:                case 'g':
1.204     schwarze 1551:                        *res = *res >= operand2;
                   1552:                        break;
1.207     schwarze 1553:                case '=':
1.204     schwarze 1554:                        *res = *res == operand2;
                   1555:                        break;
1.207     schwarze 1556:                case '!':
1.204     schwarze 1557:                        *res = *res != operand2;
                   1558:                        break;
1.207     schwarze 1559:                case '&':
1.204     schwarze 1560:                        *res = *res && operand2;
                   1561:                        break;
1.207     schwarze 1562:                case ':':
1.204     schwarze 1563:                        *res = *res || operand2;
                   1564:                        break;
1.207     schwarze 1565:                case 'i':
1.204     schwarze 1566:                        if (operand2 < *res)
                   1567:                                *res = operand2;
                   1568:                        break;
1.207     schwarze 1569:                case 'a':
1.204     schwarze 1570:                        if (operand2 > *res)
                   1571:                                *res = operand2;
                   1572:                        break;
                   1573:                default:
                   1574:                        abort();
                   1575:                }
                   1576:        }
                   1577:        return(1);
                   1578: }
                   1579:
1.180     schwarze 1580: void
1.187     schwarze 1581: roff_setreg(struct roff *r, const char *name, int val, char sign)
1.147     kristaps 1582: {
1.180     schwarze 1583:        struct roffreg  *reg;
                   1584:
                   1585:        /* Search for an existing register with the same name. */
                   1586:        reg = r->regtab;
                   1587:
                   1588:        while (reg && strcmp(name, reg->key.p))
                   1589:                reg = reg->next;
1.147     kristaps 1590:
1.180     schwarze 1591:        if (NULL == reg) {
                   1592:                /* Create a new register. */
                   1593:                reg = mandoc_malloc(sizeof(struct roffreg));
                   1594:                reg->key.p = mandoc_strdup(name);
                   1595:                reg->key.sz = strlen(name);
1.187     schwarze 1596:                reg->val = 0;
1.180     schwarze 1597:                reg->next = r->regtab;
                   1598:                r->regtab = reg;
                   1599:        }
                   1600:
1.187     schwarze 1601:        if ('+' == sign)
                   1602:                reg->val += val;
                   1603:        else if ('-' == sign)
                   1604:                reg->val -= val;
                   1605:        else
                   1606:                reg->val = val;
1.147     kristaps 1607: }
                   1608:
1.192     schwarze 1609: /*
                   1610:  * Handle some predefined read-only number registers.
                   1611:  * For now, return -1 if the requested register is not predefined;
                   1612:  * in case a predefined read-only register having the value -1
                   1613:  * were to turn up, another special value would have to be chosen.
                   1614:  */
                   1615: static int
                   1616: roff_getregro(const char *name)
                   1617: {
                   1618:
                   1619:        switch (*name) {
1.207     schwarze 1620:        case 'A':  /* ASCII approximation mode is always off. */
1.192     schwarze 1621:                return(0);
1.207     schwarze 1622:        case 'g':  /* Groff compatibility mode is always on. */
1.192     schwarze 1623:                return(1);
1.207     schwarze 1624:        case 'H':  /* Fixed horizontal resolution. */
1.192     schwarze 1625:                return (24);
1.207     schwarze 1626:        case 'j':  /* Always adjust left margin only. */
1.192     schwarze 1627:                return(0);
1.207     schwarze 1628:        case 'T':  /* Some output device is always defined. */
1.192     schwarze 1629:                return(1);
1.207     schwarze 1630:        case 'V':  /* Fixed vertical resolution. */
1.192     schwarze 1631:                return (40);
                   1632:        default:
                   1633:                return (-1);
                   1634:        }
                   1635: }
                   1636:
1.181     schwarze 1637: int
1.180     schwarze 1638: roff_getreg(const struct roff *r, const char *name)
1.147     kristaps 1639: {
1.180     schwarze 1640:        struct roffreg  *reg;
1.192     schwarze 1641:        int              val;
                   1642:
                   1643:        if ('.' == name[0] && '\0' != name[1] && '\0' == name[2]) {
                   1644:                val = roff_getregro(name + 1);
                   1645:                if (-1 != val)
                   1646:                        return (val);
                   1647:        }
1.180     schwarze 1648:
                   1649:        for (reg = r->regtab; reg; reg = reg->next)
                   1650:                if (0 == strcmp(name, reg->key.p))
1.181     schwarze 1651:                        return(reg->val);
                   1652:
                   1653:        return(0);
                   1654: }
                   1655:
                   1656: static int
                   1657: roff_getregn(const struct roff *r, const char *name, size_t len)
                   1658: {
                   1659:        struct roffreg  *reg;
1.192     schwarze 1660:        int              val;
                   1661:
                   1662:        if ('.' == name[0] && 2 == len) {
                   1663:                val = roff_getregro(name + 1);
                   1664:                if (-1 != val)
                   1665:                        return (val);
                   1666:        }
1.181     schwarze 1667:
                   1668:        for (reg = r->regtab; reg; reg = reg->next)
                   1669:                if (len == reg->key.sz &&
                   1670:                    0 == strncmp(name, reg->key.p, len))
                   1671:                        return(reg->val);
1.147     kristaps 1672:
1.180     schwarze 1673:        return(0);
1.147     kristaps 1674: }
                   1675:
1.180     schwarze 1676: static void
                   1677: roff_freereg(struct roffreg *reg)
1.147     kristaps 1678: {
1.180     schwarze 1679:        struct roffreg  *old_reg;
1.147     kristaps 1680:
1.180     schwarze 1681:        while (NULL != reg) {
                   1682:                free(reg->key.p);
                   1683:                old_reg = reg;
                   1684:                reg = reg->next;
                   1685:                free(old_reg);
                   1686:        }
1.147     kristaps 1687: }
1.92      schwarze 1688:
                   1689: static enum rofferr
1.89      kristaps 1690: roff_nr(ROFF_ARGS)
1.83      schwarze 1691: {
1.212     schwarze 1692:        char            *key, *val;
                   1693:        size_t           keysz;
1.138     kristaps 1694:        int              iv;
1.187     schwarze 1695:        char             sign;
1.89      kristaps 1696:
1.212     schwarze 1697:        key = val = *bufp + pos;
                   1698:        if ('\0' == *key)
                   1699:                return(ROFF_IGN);
                   1700:
                   1701:        keysz = roff_getname(r, &val, ln, pos);
                   1702:        if ('\\' == key[keysz])
                   1703:                return(ROFF_IGN);
                   1704:        key[keysz] = '\0';
1.89      kristaps 1705:
1.187     schwarze 1706:        sign = *val;
                   1707:        if ('+' == sign || '-' == sign)
                   1708:                val++;
                   1709:
1.204     schwarze 1710:        if (roff_evalnum(val, NULL, &iv, 0))
                   1711:                roff_setreg(r, key, iv, sign);
1.109     kristaps 1712:
1.203     schwarze 1713:        return(ROFF_IGN);
                   1714: }
                   1715:
                   1716: static enum rofferr
                   1717: roff_rr(ROFF_ARGS)
                   1718: {
                   1719:        struct roffreg  *reg, **prev;
1.212     schwarze 1720:        char            *name, *cp;
                   1721:        size_t           namesz;
1.203     schwarze 1722:
1.212     schwarze 1723:        name = cp = *bufp + pos;
                   1724:        if ('\0' == *name)
                   1725:                return(ROFF_IGN);
                   1726:        namesz = roff_getname(r, &cp, ln, pos);
                   1727:        name[namesz] = '\0';
1.203     schwarze 1728:
                   1729:        prev = &r->regtab;
                   1730:        while (1) {
                   1731:                reg = *prev;
                   1732:                if (NULL == reg || !strcmp(name, reg->key.p))
                   1733:                        break;
                   1734:                prev = &reg->next;
                   1735:        }
                   1736:        if (NULL != reg) {
                   1737:                *prev = reg->next;
                   1738:                free(reg->key.p);
                   1739:                free(reg);
                   1740:        }
1.122     schwarze 1741:        return(ROFF_IGN);
                   1742: }
                   1743:
                   1744: static enum rofferr
                   1745: roff_rm(ROFF_ARGS)
                   1746: {
                   1747:        const char       *name;
                   1748:        char             *cp;
1.212     schwarze 1749:        size_t            namesz;
1.122     schwarze 1750:
                   1751:        cp = *bufp + pos;
                   1752:        while ('\0' != *cp) {
1.212     schwarze 1753:                name = cp;
                   1754:                namesz = roff_getname(r, &cp, ln, (int)(cp - *bufp));
                   1755:                roff_setstrn(&r->strtab, name, namesz, NULL, 0, 0);
                   1756:                if ('\\' == name[namesz])
                   1757:                        break;
1.122     schwarze 1758:        }
1.178     schwarze 1759:        return(ROFF_IGN);
                   1760: }
                   1761:
                   1762: static enum rofferr
                   1763: roff_it(ROFF_ARGS)
                   1764: {
                   1765:        char            *cp;
                   1766:        size_t           len;
                   1767:        int              iv;
                   1768:
                   1769:        /* Parse the number of lines. */
                   1770:        cp = *bufp + pos;
                   1771:        len = strcspn(cp, " \t");
                   1772:        cp[len] = '\0';
                   1773:        if ((iv = mandoc_strntoi(cp, len, 10)) <= 0) {
1.222     schwarze 1774:                mandoc_msg(MANDOCERR_IT_NONUM, r->parse,
1.207     schwarze 1775:                    ln, ppos, *bufp + 1);
1.178     schwarze 1776:                return(ROFF_IGN);
                   1777:        }
                   1778:        cp += len + 1;
                   1779:
                   1780:        /* Arm the input line trap. */
                   1781:        roffit_lines = iv;
                   1782:        roffit_macro = mandoc_strdup(cp);
1.109     kristaps 1783:        return(ROFF_IGN);
1.175     schwarze 1784: }
                   1785:
                   1786: static enum rofferr
                   1787: roff_Dd(ROFF_ARGS)
                   1788: {
                   1789:        const char *const       *cp;
                   1790:
1.227     schwarze 1791:        if ((r->options & (MPARSE_MDOC | MPARSE_QUICK)) == 0)
1.175     schwarze 1792:                for (cp = __mdoc_reserved; *cp; cp++)
                   1793:                        roff_setstr(r, *cp, NULL, 0);
                   1794:
1.227     schwarze 1795:        if (r->format == 0)
                   1796:                r->format = MPARSE_MDOC;
                   1797:
1.175     schwarze 1798:        return(ROFF_CONT);
                   1799: }
                   1800:
                   1801: static enum rofferr
                   1802: roff_TH(ROFF_ARGS)
                   1803: {
                   1804:        const char *const       *cp;
                   1805:
1.227     schwarze 1806:        if ((r->options & MPARSE_QUICK) == 0)
1.175     schwarze 1807:                for (cp = __man_reserved; *cp; cp++)
                   1808:                        roff_setstr(r, *cp, NULL, 0);
                   1809:
1.227     schwarze 1810:        if (r->format == 0)
                   1811:                r->format = MPARSE_MAN;
                   1812:
1.175     schwarze 1813:        return(ROFF_CONT);
1.109     kristaps 1814: }
                   1815:
                   1816: static enum rofferr
                   1817: roff_TE(ROFF_ARGS)
                   1818: {
                   1819:
                   1820:        if (NULL == r->tbl)
1.221     schwarze 1821:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                   1822:                    ln, ppos, "TE");
1.115     kristaps 1823:        else
1.151     kristaps 1824:                tbl_end(&r->tbl);
1.109     kristaps 1825:
1.112     kristaps 1826:        return(ROFF_IGN);
                   1827: }
                   1828:
                   1829: static enum rofferr
                   1830: roff_T_(ROFF_ARGS)
                   1831: {
                   1832:
                   1833:        if (NULL == r->tbl)
1.221     schwarze 1834:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                   1835:                    ln, ppos, "T&");
1.112     kristaps 1836:        else
1.116     kristaps 1837:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1838:
1.109     kristaps 1839:        return(ROFF_IGN);
                   1840: }
                   1841:
1.156     kristaps 1842: #if 0
                   1843: static int
1.151     kristaps 1844: roff_closeeqn(struct roff *r)
                   1845: {
                   1846:
                   1847:        return(r->eqn && ROFF_EQN == eqn_end(&r->eqn) ? 1 : 0);
                   1848: }
1.156     kristaps 1849: #endif
1.151     kristaps 1850:
1.156     kristaps 1851: static void
1.207     schwarze 1852: roff_openeqn(struct roff *r, const char *name, int line,
1.151     kristaps 1853:                int offs, const char *buf)
1.125     kristaps 1854: {
1.151     kristaps 1855:        struct eqn_node *e;
                   1856:        int              poff;
1.125     kristaps 1857:
                   1858:        assert(NULL == r->eqn);
1.151     kristaps 1859:        e = eqn_alloc(name, offs, line, r->parse);
1.125     kristaps 1860:
                   1861:        if (r->last_eqn)
                   1862:                r->last_eqn->next = e;
                   1863:        else
                   1864:                r->first_eqn = r->last_eqn = e;
                   1865:
                   1866:        r->eqn = r->last_eqn = e;
1.151     kristaps 1867:
                   1868:        if (buf) {
                   1869:                poff = 0;
                   1870:                eqn_read(&r->eqn, line, buf, offs, &poff);
                   1871:        }
                   1872: }
                   1873:
                   1874: static enum rofferr
                   1875: roff_EQ(ROFF_ARGS)
                   1876: {
                   1877:
                   1878:        roff_openeqn(r, *bufp + pos, ln, ppos, NULL);
1.125     kristaps 1879:        return(ROFF_IGN);
                   1880: }
                   1881:
                   1882: static enum rofferr
                   1883: roff_EN(ROFF_ARGS)
                   1884: {
                   1885:
1.221     schwarze 1886:        mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse, ln, ppos, "EN");
1.125     kristaps 1887:        return(ROFF_IGN);
                   1888: }
                   1889:
                   1890: static enum rofferr
1.109     kristaps 1891: roff_TS(ROFF_ARGS)
                   1892: {
1.176     schwarze 1893:        struct tbl_node *tbl;
1.89      kristaps 1894:
1.115     kristaps 1895:        if (r->tbl) {
1.221     schwarze 1896:                mandoc_msg(MANDOCERR_BLK_BROKEN, r->parse,
                   1897:                    ln, ppos, "TS breaks TS");
1.151     kristaps 1898:                tbl_end(&r->tbl);
1.115     kristaps 1899:        }
1.83      schwarze 1900:
1.176     schwarze 1901:        tbl = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 1902:
                   1903:        if (r->last_tbl)
1.176     schwarze 1904:                r->last_tbl->next = tbl;
1.113     kristaps 1905:        else
1.176     schwarze 1906:                r->first_tbl = r->last_tbl = tbl;
1.113     kristaps 1907:
1.176     schwarze 1908:        r->tbl = r->last_tbl = tbl;
1.83      schwarze 1909:        return(ROFF_IGN);
1.92      schwarze 1910: }
                   1911:
1.105     kristaps 1912: static enum rofferr
1.174     kristaps 1913: roff_cc(ROFF_ARGS)
                   1914: {
                   1915:        const char      *p;
                   1916:
                   1917:        p = *bufp + pos;
                   1918:
                   1919:        if ('\0' == *p || '.' == (r->control = *p++))
                   1920:                r->control = 0;
                   1921:
                   1922:        if ('\0' != *p)
                   1923:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1924:
                   1925:        return(ROFF_IGN);
                   1926: }
                   1927:
                   1928: static enum rofferr
1.164     kristaps 1929: roff_tr(ROFF_ARGS)
                   1930: {
                   1931:        const char      *p, *first, *second;
                   1932:        size_t           fsz, ssz;
                   1933:        enum mandoc_esc  esc;
                   1934:
                   1935:        p = *bufp + pos;
                   1936:
                   1937:        if ('\0' == *p) {
                   1938:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1939:                return(ROFF_IGN);
                   1940:        }
                   1941:
                   1942:        while ('\0' != *p) {
                   1943:                fsz = ssz = 1;
                   1944:
                   1945:                first = p++;
                   1946:                if ('\\' == *first) {
                   1947:                        esc = mandoc_escape(&p, NULL, NULL);
                   1948:                        if (ESCAPE_ERROR == esc) {
1.219     schwarze 1949:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
                   1950:                                    ln, (int)(p - *bufp), first);
1.164     kristaps 1951:                                return(ROFF_IGN);
                   1952:                        }
                   1953:                        fsz = (size_t)(p - first);
                   1954:                }
                   1955:
                   1956:                second = p++;
                   1957:                if ('\\' == *second) {
                   1958:                        esc = mandoc_escape(&p, NULL, NULL);
                   1959:                        if (ESCAPE_ERROR == esc) {
1.219     schwarze 1960:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
                   1961:                                    ln, (int)(p - *bufp), second);
1.164     kristaps 1962:                                return(ROFF_IGN);
                   1963:                        }
                   1964:                        ssz = (size_t)(p - second);
1.165     kristaps 1965:                } else if ('\0' == *second) {
1.207     schwarze 1966:                        mandoc_msg(MANDOCERR_ARGCOUNT, r->parse,
                   1967:                            ln, (int)(p - *bufp), NULL);
1.164     kristaps 1968:                        second = " ";
1.165     kristaps 1969:                        p--;
1.164     kristaps 1970:                }
                   1971:
1.167     kristaps 1972:                if (fsz > 1) {
1.207     schwarze 1973:                        roff_setstrn(&r->xmbtab, first, fsz,
                   1974:                            second, ssz, 0);
1.167     kristaps 1975:                        continue;
                   1976:                }
                   1977:
                   1978:                if (NULL == r->xtab)
1.207     schwarze 1979:                        r->xtab = mandoc_calloc(128,
                   1980:                            sizeof(struct roffstr));
1.167     kristaps 1981:
                   1982:                free(r->xtab[(int)*first].p);
                   1983:                r->xtab[(int)*first].p = mandoc_strndup(second, ssz);
                   1984:                r->xtab[(int)*first].sz = ssz;
1.164     kristaps 1985:        }
                   1986:
                   1987:        return(ROFF_IGN);
                   1988: }
                   1989:
                   1990: static enum rofferr
1.105     kristaps 1991: roff_so(ROFF_ARGS)
                   1992: {
                   1993:        char *name;
                   1994:
1.210     schwarze 1995:        name = *bufp + pos;
1.224     schwarze 1996:        mandoc_vmsg(MANDOCERR_SO, r->parse, ln, ppos, "so %s", name);
1.105     kristaps 1997:
                   1998:        /*
                   1999:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   2000:         * opening anything that's not in our cwd or anything beneath
                   2001:         * it.  Thus, explicitly disallow traversing up the file-system
                   2002:         * or using absolute paths.
                   2003:         */
                   2004:
                   2005:        if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
1.210     schwarze 2006:                mandoc_vmsg(MANDOCERR_SO_PATH, r->parse, ln, ppos,
                   2007:                    ".so %s", name);
1.105     kristaps 2008:                return(ROFF_ERR);
                   2009:        }
                   2010:
                   2011:        *offs = pos;
                   2012:        return(ROFF_SO);
                   2013: }
1.92      schwarze 2014:
1.106     kristaps 2015: static enum rofferr
                   2016: roff_userdef(ROFF_ARGS)
1.99      kristaps 2017: {
1.106     kristaps 2018:        const char       *arg[9];
                   2019:        char             *cp, *n1, *n2;
1.119     schwarze 2020:        int               i;
1.106     kristaps 2021:
                   2022:        /*
                   2023:         * Collect pointers to macro argument strings
1.188     schwarze 2024:         * and NUL-terminate them.
1.106     kristaps 2025:         */
                   2026:        cp = *bufp + pos;
1.119     schwarze 2027:        for (i = 0; i < 9; i++)
1.120     schwarze 2028:                arg[i] = '\0' == *cp ? "" :
1.136     kristaps 2029:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 2030:
1.106     kristaps 2031:        /*
                   2032:         * Expand macro arguments.
1.99      kristaps 2033:         */
1.106     kristaps 2034:        *szp = 0;
                   2035:        n1 = cp = mandoc_strdup(r->current_string);
                   2036:        while (NULL != (cp = strstr(cp, "\\$"))) {
                   2037:                i = cp[2] - '1';
                   2038:                if (0 > i || 8 < i) {
                   2039:                        /* Not an argument invocation. */
                   2040:                        cp += 2;
                   2041:                        continue;
                   2042:                }
1.209     schwarze 2043:                *cp = '\0';
                   2044:                *szp = mandoc_asprintf(&n2, "%s%s%s",
                   2045:                    n1, arg[i], cp + 3) + 1;
1.106     kristaps 2046:                cp = n2 + (cp - n1);
                   2047:                free(n1);
                   2048:                n1 = n2;
1.99      kristaps 2049:        }
                   2050:
1.106     kristaps 2051:        /*
                   2052:         * Replace the macro invocation
                   2053:         * by the expanded macro.
                   2054:         */
                   2055:        free(*bufp);
                   2056:        *bufp = n1;
                   2057:        if (0 == *szp)
                   2058:                *szp = strlen(*bufp) + 1;
                   2059:
                   2060:        return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
                   2061:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 2062: }
1.121     schwarze 2063:
1.212     schwarze 2064: static size_t
1.121     schwarze 2065: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   2066: {
                   2067:        char     *name, *cp;
1.212     schwarze 2068:        size_t    namesz;
1.121     schwarze 2069:
                   2070:        name = *cpp;
                   2071:        if ('\0' == *name)
1.212     schwarze 2072:                return(0);
1.121     schwarze 2073:
1.212     schwarze 2074:        /* Read until end of name and terminate it with NUL. */
                   2075:        for (cp = name; 1; cp++) {
                   2076:                if ('\0' == *cp || ' ' == *cp) {
                   2077:                        namesz = cp - name;
                   2078:                        break;
                   2079:                }
1.121     schwarze 2080:                if ('\\' != *cp)
                   2081:                        continue;
1.215     schwarze 2082:                namesz = cp - name;
                   2083:                if ('{' == cp[1] || '}' == cp[1])
                   2084:                        break;
1.121     schwarze 2085:                cp++;
                   2086:                if ('\\' == *cp)
                   2087:                        continue;
1.224     schwarze 2088:                mandoc_vmsg(MANDOCERR_NAMESC, r->parse, ln, pos,
                   2089:                    "%.*s", (int)(cp - name + 1), name);
1.212     schwarze 2090:                mandoc_escape((const char **)&cp, NULL, NULL);
                   2091:                break;
1.121     schwarze 2092:        }
                   2093:
                   2094:        /* Read past spaces. */
                   2095:        while (' ' == *cp)
                   2096:                cp++;
                   2097:
                   2098:        *cpp = cp;
1.212     schwarze 2099:        return(namesz);
1.121     schwarze 2100: }
                   2101:
1.106     kristaps 2102: /*
                   2103:  * Store *string into the user-defined string called *name.
                   2104:  * To clear an existing entry, call with (*r, *name, NULL, 0).
1.193     schwarze 2105:  * append == 0: replace mode
                   2106:  * append == 1: single-line append mode
                   2107:  * append == 2: multiline append mode, append '\n' after each call
1.106     kristaps 2108:  */
1.94      kristaps 2109: static void
1.106     kristaps 2110: roff_setstr(struct roff *r, const char *name, const char *string,
1.193     schwarze 2111:        int append)
1.92      schwarze 2112: {
1.164     kristaps 2113:
                   2114:        roff_setstrn(&r->strtab, name, strlen(name), string,
1.207     schwarze 2115:            string ? strlen(string) : 0, append);
1.164     kristaps 2116: }
                   2117:
                   2118: static void
1.166     kristaps 2119: roff_setstrn(struct roffkv **r, const char *name, size_t namesz,
1.193     schwarze 2120:                const char *string, size_t stringsz, int append)
1.164     kristaps 2121: {
1.166     kristaps 2122:        struct roffkv   *n;
1.164     kristaps 2123:        char            *c;
                   2124:        int              i;
                   2125:        size_t           oldch, newch;
1.92      schwarze 2126:
1.106     kristaps 2127:        /* Search for an existing string with the same name. */
1.164     kristaps 2128:        n = *r;
                   2129:
1.211     schwarze 2130:        while (n && (namesz != n->key.sz ||
                   2131:                        strncmp(n->key.p, name, namesz)))
1.92      schwarze 2132:                n = n->next;
1.94      kristaps 2133:
                   2134:        if (NULL == n) {
1.106     kristaps 2135:                /* Create a new string table entry. */
1.166     kristaps 2136:                n = mandoc_malloc(sizeof(struct roffkv));
                   2137:                n->key.p = mandoc_strndup(name, namesz);
                   2138:                n->key.sz = namesz;
                   2139:                n->val.p = NULL;
                   2140:                n->val.sz = 0;
1.164     kristaps 2141:                n->next = *r;
                   2142:                *r = n;
1.193     schwarze 2143:        } else if (0 == append) {
1.166     kristaps 2144:                free(n->val.p);
                   2145:                n->val.p = NULL;
                   2146:                n->val.sz = 0;
1.106     kristaps 2147:        }
                   2148:
                   2149:        if (NULL == string)
                   2150:                return;
                   2151:
                   2152:        /*
                   2153:         * One additional byte for the '\n' in multiline mode,
                   2154:         * and one for the terminating '\0'.
                   2155:         */
1.193     schwarze 2156:        newch = stringsz + (1 < append ? 2u : 1u);
1.164     kristaps 2157:
1.166     kristaps 2158:        if (NULL == n->val.p) {
                   2159:                n->val.p = mandoc_malloc(newch);
                   2160:                *n->val.p = '\0';
1.106     kristaps 2161:                oldch = 0;
                   2162:        } else {
1.166     kristaps 2163:                oldch = n->val.sz;
                   2164:                n->val.p = mandoc_realloc(n->val.p, oldch + newch);
1.106     kristaps 2165:        }
                   2166:
                   2167:        /* Skip existing content in the destination buffer. */
1.166     kristaps 2168:        c = n->val.p + (int)oldch;
1.106     kristaps 2169:
                   2170:        /* Append new content to the destination buffer. */
1.164     kristaps 2171:        i = 0;
                   2172:        while (i < (int)stringsz) {
1.106     kristaps 2173:                /*
                   2174:                 * Rudimentary roff copy mode:
                   2175:                 * Handle escaped backslashes.
                   2176:                 */
1.164     kristaps 2177:                if ('\\' == string[i] && '\\' == string[i + 1])
                   2178:                        i++;
                   2179:                *c++ = string[i++];
1.106     kristaps 2180:        }
1.94      kristaps 2181:
1.106     kristaps 2182:        /* Append terminating bytes. */
1.193     schwarze 2183:        if (1 < append)
1.106     kristaps 2184:                *c++ = '\n';
1.163     kristaps 2185:
1.106     kristaps 2186:        *c = '\0';
1.166     kristaps 2187:        n->val.sz = (int)(c - n->val.p);
1.92      schwarze 2188: }
                   2189:
1.94      kristaps 2190: static const char *
                   2191: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 2192: {
1.166     kristaps 2193:        const struct roffkv *n;
1.191     schwarze 2194:        int i;
1.92      schwarze 2195:
1.164     kristaps 2196:        for (n = r->strtab; n; n = n->next)
1.207     schwarze 2197:                if (0 == strncmp(name, n->key.p, len) &&
                   2198:                    '\0' == n->key.p[(int)len])
1.166     kristaps 2199:                        return(n->val.p);
1.191     schwarze 2200:
                   2201:        for (i = 0; i < PREDEFS_MAX; i++)
                   2202:                if (0 == strncmp(name, predefs[i].name, len) &&
                   2203:                                '\0' == predefs[i].name[(int)len])
                   2204:                        return(predefs[i].str);
1.94      kristaps 2205:
1.157     kristaps 2206:        return(NULL);
1.92      schwarze 2207: }
                   2208:
1.94      kristaps 2209: static void
1.167     kristaps 2210: roff_freestr(struct roffkv *r)
1.92      schwarze 2211: {
1.166     kristaps 2212:        struct roffkv    *n, *nn;
1.92      schwarze 2213:
1.167     kristaps 2214:        for (n = r; n; n = nn) {
1.166     kristaps 2215:                free(n->key.p);
                   2216:                free(n->val.p);
1.92      schwarze 2217:                nn = n->next;
                   2218:                free(n);
                   2219:        }
1.114     kristaps 2220: }
                   2221:
                   2222: const struct tbl_span *
                   2223: roff_span(const struct roff *r)
                   2224: {
1.207     schwarze 2225:
1.114     kristaps 2226:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 2227: }
                   2228:
                   2229: const struct eqn *
                   2230: roff_eqn(const struct roff *r)
                   2231: {
1.207     schwarze 2232:
1.125     kristaps 2233:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.164     kristaps 2234: }
                   2235:
                   2236: /*
                   2237:  * Duplicate an input string, making the appropriate character
                   2238:  * conversations (as stipulated by `tr') along the way.
                   2239:  * Returns a heap-allocated string with all the replacements made.
                   2240:  */
                   2241: char *
                   2242: roff_strdup(const struct roff *r, const char *p)
                   2243: {
1.166     kristaps 2244:        const struct roffkv *cp;
1.164     kristaps 2245:        char            *res;
                   2246:        const char      *pp;
                   2247:        size_t           ssz, sz;
                   2248:        enum mandoc_esc  esc;
                   2249:
1.167     kristaps 2250:        if (NULL == r->xmbtab && NULL == r->xtab)
1.164     kristaps 2251:                return(mandoc_strdup(p));
                   2252:        else if ('\0' == *p)
                   2253:                return(mandoc_strdup(""));
                   2254:
                   2255:        /*
                   2256:         * Step through each character looking for term matches
                   2257:         * (remember that a `tr' can be invoked with an escape, which is
                   2258:         * a glyph but the escape is multi-character).
                   2259:         * We only do this if the character hash has been initialised
                   2260:         * and the string is >0 length.
                   2261:         */
                   2262:
                   2263:        res = NULL;
                   2264:        ssz = 0;
                   2265:
                   2266:        while ('\0' != *p) {
1.167     kristaps 2267:                if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) {
                   2268:                        sz = r->xtab[(int)*p].sz;
                   2269:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2270:                        memcpy(res + ssz, r->xtab[(int)*p].p, sz);
                   2271:                        ssz += sz;
                   2272:                        p++;
                   2273:                        continue;
                   2274:                } else if ('\\' != *p) {
                   2275:                        res = mandoc_realloc(res, ssz + 2);
                   2276:                        res[ssz++] = *p++;
                   2277:                        continue;
                   2278:                }
                   2279:
1.164     kristaps 2280:                /* Search for term matches. */
1.167     kristaps 2281:                for (cp = r->xmbtab; cp; cp = cp->next)
1.166     kristaps 2282:                        if (0 == strncmp(p, cp->key.p, cp->key.sz))
1.164     kristaps 2283:                                break;
                   2284:
                   2285:                if (NULL != cp) {
                   2286:                        /*
                   2287:                         * A match has been found.
                   2288:                         * Append the match to the array and move
                   2289:                         * forward by its keysize.
                   2290:                         */
1.207     schwarze 2291:                        res = mandoc_realloc(res,
                   2292:                            ssz + cp->val.sz + 1);
1.166     kristaps 2293:                        memcpy(res + ssz, cp->val.p, cp->val.sz);
                   2294:                        ssz += cp->val.sz;
                   2295:                        p += (int)cp->key.sz;
1.164     kristaps 2296:                        continue;
                   2297:                }
                   2298:
1.167     kristaps 2299:                /*
                   2300:                 * Handle escapes carefully: we need to copy
                   2301:                 * over just the escape itself, or else we might
                   2302:                 * do replacements within the escape itself.
                   2303:                 * Make sure to pass along the bogus string.
                   2304:                 */
                   2305:                pp = p++;
                   2306:                esc = mandoc_escape(&p, NULL, NULL);
                   2307:                if (ESCAPE_ERROR == esc) {
                   2308:                        sz = strlen(pp);
1.164     kristaps 2309:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2310:                        memcpy(res + ssz, pp, sz);
1.167     kristaps 2311:                        break;
1.164     kristaps 2312:                }
1.207     schwarze 2313:                /*
                   2314:                 * We bail out on bad escapes.
1.167     kristaps 2315:                 * No need to warn: we already did so when
                   2316:                 * roff_res() was called.
                   2317:                 */
                   2318:                sz = (int)(p - pp);
                   2319:                res = mandoc_realloc(res, ssz + sz + 1);
                   2320:                memcpy(res + ssz, pp, sz);
                   2321:                ssz += sz;
1.164     kristaps 2322:        }
                   2323:
                   2324:        res[(int)ssz] = '\0';
                   2325:        return(res);
1.227     schwarze 2326: }
                   2327:
                   2328: int
                   2329: roff_getformat(const struct roff *r)
                   2330: {
                   2331:
                   2332:        return(r->format);
1.174     kristaps 2333: }
                   2334:
                   2335: /*
1.207     schwarze 2336:  * Find out whether a line is a macro line or not.
1.174     kristaps 2337:  * If it is, adjust the current position and return one; if it isn't,
                   2338:  * return zero and don't change the current position.
                   2339:  * If the control character has been set with `.cc', then let that grain
                   2340:  * precedence.
                   2341:  * This is slighly contrary to groff, where using the non-breaking
                   2342:  * control character when `cc' has been invoked will cause the
                   2343:  * non-breaking macro contents to be printed verbatim.
                   2344:  */
                   2345: int
                   2346: roff_getcontrol(const struct roff *r, const char *cp, int *ppos)
                   2347: {
                   2348:        int             pos;
                   2349:
                   2350:        pos = *ppos;
                   2351:
                   2352:        if (0 != r->control && cp[pos] == r->control)
                   2353:                pos++;
                   2354:        else if (0 != r->control)
                   2355:                return(0);
                   2356:        else if ('\\' == cp[pos] && '.' == cp[pos + 1])
                   2357:                pos += 2;
                   2358:        else if ('.' == cp[pos] || '\'' == cp[pos])
                   2359:                pos++;
                   2360:        else
                   2361:                return(0);
                   2362:
                   2363:        while (' ' == cp[pos] || '\t' == cp[pos])
                   2364:                pos++;
                   2365:
                   2366:        *ppos = pos;
                   2367:        return(1);
1.74      kristaps 2368: }

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