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Annotation of mandoc/roff.c, Revision 1.223

1.223   ! schwarze    1: /*     $Id: roff.c,v 1.222 2014/07/30 12:58:21 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: #ifdef HAVE_CONFIG_H
                     19: #include "config.h"
                     20: #endif
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"
1.109     kristaps   30: #include "libroff.h"
1.94      kristaps   31: #include "libmandoc.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 */
        !           125:        char             control; /* control character */
1.79      kristaps  126: };
                    127:
1.67      kristaps  128: struct roffnode {
                    129:        enum rofft       tok; /* type of node */
                    130:        struct roffnode *parent; /* up one in stack */
                    131:        int              line; /* parse line */
                    132:        int              col; /* parse col */
1.106     kristaps  133:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  134:        char            *end; /* end-rules: custom token */
                    135:        int              endspan; /* end-rules: next-line or infty */
1.198     schwarze  136:        int              rule; /* current evaluation rule */
1.67      kristaps  137: };
                    138:
                    139: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  140:                         enum rofft tok, /* tok of macro */ \
1.207     schwarze  141:                         char **bufp, /* input buffer */ \
1.67      kristaps  142:                         size_t *szp, /* size of input buffer */ \
                    143:                         int ln, /* parse line */ \
1.75      kristaps  144:                         int ppos, /* original pos in buffer */ \
                    145:                         int pos, /* current pos in buffer */ \
1.74      kristaps  146:                         int *offs /* reset offset of buffer data */
1.67      kristaps  147:
                    148: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    149:
                    150: struct roffmac {
                    151:        const char      *name; /* macro name */
1.79      kristaps  152:        roffproc         proc; /* process new macro */
                    153:        roffproc         text; /* process as child text of macro */
                    154:        roffproc         sub; /* process as child of macro */
                    155:        int              flags;
                    156: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  157:        struct roffmac  *next;
1.67      kristaps  158: };
                    159:
1.141     kristaps  160: struct predef {
                    161:        const char      *name; /* predefined input name */
                    162:        const char      *str; /* replacement symbol */
                    163: };
                    164:
                    165: #define        PREDEF(__name, __str) \
                    166:        { (__name), (__str) },
                    167:
1.155     kristaps  168: static enum rofft       roffhash_find(const char *, size_t);
                    169: static void             roffhash_init(void);
                    170: static void             roffnode_cleanscope(struct roff *);
                    171: static void             roffnode_pop(struct roff *);
                    172: static void             roffnode_push(struct roff *, enum rofft,
                    173:                                const char *, int, int);
1.80      kristaps  174: static enum rofferr     roff_block(ROFF_ARGS);
                    175: static enum rofferr     roff_block_text(ROFF_ARGS);
                    176: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    177: static enum rofferr     roff_cblock(ROFF_ARGS);
1.174     kristaps  178: static enum rofferr     roff_cc(ROFF_ARGS);
1.195     schwarze  179: static void             roff_ccond(struct roff *, int, int);
1.82      kristaps  180: static enum rofferr     roff_cond(ROFF_ARGS);
                    181: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    182: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  183: static enum rofferr     roff_ds(ROFF_ARGS);
1.198     schwarze  184: static int              roff_evalcond(const char *, int *);
1.204     schwarze  185: static int              roff_evalnum(const char *, int *, int *, int);
                    186: static int              roff_evalpar(const char *, int *, int *);
1.198     schwarze  187: static int              roff_evalstrcond(const char *, int *);
1.155     kristaps  188: static void             roff_free1(struct roff *);
1.180     schwarze  189: static void             roff_freereg(struct roffreg *);
1.167     kristaps  190: static void             roff_freestr(struct roffkv *);
1.212     schwarze  191: static size_t           roff_getname(struct roff *, char **, int, int);
1.184     schwarze  192: static int              roff_getnum(const char *, int *, int *);
                    193: static int              roff_getop(const char *, int *, char *);
1.181     schwarze  194: static int              roff_getregn(const struct roff *,
                    195:                                const char *, size_t);
1.192     schwarze  196: static int              roff_getregro(const char *name);
1.207     schwarze  197: static const char      *roff_getstrn(const struct roff *,
1.94      kristaps  198:                                const char *, size_t);
1.178     schwarze  199: static enum rofferr     roff_it(ROFF_ARGS);
1.103     kristaps  200: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  201: static enum rofferr     roff_nr(ROFF_ARGS);
1.169     schwarze  202: static void             roff_openeqn(struct roff *, const char *,
1.156     kristaps  203:                                int, int, const char *);
1.214     schwarze  204: static enum rofft       roff_parse(struct roff *, char *, int *,
                    205:                                int, int);
1.178     schwarze  206: static enum rofferr     roff_parsetext(char **, size_t *, int, int *);
1.207     schwarze  207: static enum rofferr     roff_res(struct roff *,
1.142     kristaps  208:                                char **, size_t *, int, int);
1.122     schwarze  209: static enum rofferr     roff_rm(ROFF_ARGS);
1.203     schwarze  210: static enum rofferr     roff_rr(ROFF_ARGS);
1.94      kristaps  211: static void             roff_setstr(struct roff *,
1.106     kristaps  212:                                const char *, const char *, int);
1.207     schwarze  213: static void             roff_setstrn(struct roffkv **, const char *,
1.164     kristaps  214:                                size_t, const char *, size_t, int);
1.105     kristaps  215: static enum rofferr     roff_so(ROFF_ARGS);
1.164     kristaps  216: static enum rofferr     roff_tr(ROFF_ARGS);
1.175     schwarze  217: static enum rofferr     roff_Dd(ROFF_ARGS);
                    218: static enum rofferr     roff_TH(ROFF_ARGS);
1.109     kristaps  219: static enum rofferr     roff_TE(ROFF_ARGS);
                    220: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  221: static enum rofferr     roff_EQ(ROFF_ARGS);
                    222: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  223: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  224: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  225:
1.155     kristaps  226: /* See roffhash_find() */
1.85      kristaps  227:
                    228: #define        ASCII_HI         126
                    229: #define        ASCII_LO         33
                    230: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    231:
                    232: static struct roffmac  *hash[HASHWIDTH];
                    233:
                    234: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  235:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  236:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    237:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    238:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.193     schwarze  239:        { "as", roff_ds, NULL, NULL, 0, NULL },
1.174     kristaps  240:        { "cc", roff_cc, NULL, NULL, 0, NULL },
1.194     schwarze  241:        { "ce", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  242:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    243:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    244:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  245:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  246:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.185     schwarze  247:        { "fam", roff_line_ignore, NULL, NULL, 0, NULL },
1.186     schwarze  248:        { "hw", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  249:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  250:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    251:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    252:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.178     schwarze  253:        { "it", roff_it, NULL, NULL, 0, NULL },
1.103     kristaps  254:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    255:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  256:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  257:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
                    258:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  259:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.203     schwarze  260:        { "rr", roff_rr, NULL, NULL, 0, NULL },
1.105     kristaps  261:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  262:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.164     kristaps  263:        { "tr", roff_tr, NULL, NULL, 0, NULL },
1.175     schwarze  264:        { "Dd", roff_Dd, NULL, NULL, 0, NULL },
                    265:        { "TH", roff_TH, NULL, NULL, 0, NULL },
1.109     kristaps  266:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    267:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  268:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  269:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    270:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.85      kristaps  271:        { ".", roff_cblock, NULL, NULL, 0, NULL },
1.106     kristaps  272:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  273: };
                    274:
1.200     schwarze  275: /* not currently implemented: Ds em Eq LP Me PP pp Or Rd Sf SH */
1.175     schwarze  276: const  char *const __mdoc_reserved[] = {
                    277:        "Ac", "Ad", "An", "Ao", "Ap", "Aq", "Ar", "At",
                    278:        "Bc", "Bd", "Bf", "Bk", "Bl", "Bo", "Bq",
                    279:        "Brc", "Bro", "Brq", "Bsx", "Bt", "Bx",
                    280:        "Cd", "Cm", "Db", "Dc", "Dd", "Dl", "Do", "Dq",
1.200     schwarze  281:        "Dt", "Dv", "Dx", "D1",
                    282:        "Ec", "Ed", "Ef", "Ek", "El", "Em",
                    283:        "En", "Eo", "Er", "Es", "Ev", "Ex",
1.175     schwarze  284:        "Fa", "Fc", "Fd", "Fl", "Fn", "Fo", "Fr", "Ft", "Fx",
1.200     schwarze  285:        "Hf", "Ic", "In", "It", "Lb", "Li", "Lk", "Lp",
                    286:        "Ms", "Mt", "Nd", "Nm", "No", "Ns", "Nx",
1.175     schwarze  287:        "Oc", "Oo", "Op", "Os", "Ot", "Ox",
1.200     schwarze  288:        "Pa", "Pc", "Pf", "Po", "Pp", "Pq",
                    289:        "Qc", "Ql", "Qo", "Qq", "Re", "Rs", "Rv",
                    290:        "Sc", "Sh", "Sm", "So", "Sq",
1.175     schwarze  291:        "Ss", "St", "Sx", "Sy",
                    292:        "Ta", "Tn", "Ud", "Ux", "Va", "Vt", "Xc", "Xo", "Xr",
1.200     schwarze  293:        "%A", "%B", "%C", "%D", "%I", "%J", "%N", "%O",
1.175     schwarze  294:        "%P", "%Q", "%R", "%T", "%U", "%V",
                    295:        NULL
                    296: };
                    297:
1.200     schwarze  298: /* not currently implemented: BT DE DS ME MT PT SY TQ YS */
1.175     schwarze  299: const  char *const __man_reserved[] = {
1.200     schwarze  300:        "AT", "B", "BI", "BR", "DT",
                    301:        "EE", "EN", "EQ", "EX", "HP", "I", "IB", "IP", "IR",
                    302:        "LP", "OP", "P", "PD", "PP",
                    303:        "R", "RB", "RE", "RI", "RS", "SB", "SH", "SM", "SS",
                    304:        "TE", "TH", "TP", "TS", "T&", "UC", "UE", "UR",
1.175     schwarze  305:        NULL
                    306: };
                    307:
1.141     kristaps  308: /* Array of injected predefined strings. */
                    309: #define        PREDEFS_MAX      38
                    310: static const struct predef predefs[PREDEFS_MAX] = {
                    311: #include "predefs.in"
                    312: };
                    313:
1.155     kristaps  314: /* See roffhash_find() */
1.85      kristaps  315: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    316:
1.178     schwarze  317: static int      roffit_lines;  /* number of lines to delay */
                    318: static char    *roffit_macro;  /* nil-terminated macro line */
                    319:
1.207     schwarze  320:
1.85      kristaps  321: static void
1.155     kristaps  322: roffhash_init(void)
1.85      kristaps  323: {
                    324:        struct roffmac   *n;
                    325:        int               buc, i;
                    326:
1.106     kristaps  327:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  328:                assert(roffs[i].name[0] >= ASCII_LO);
                    329:                assert(roffs[i].name[0] <= ASCII_HI);
                    330:
                    331:                buc = ROFF_HASH(roffs[i].name);
                    332:
                    333:                if (NULL != (n = hash[buc])) {
                    334:                        for ( ; n->next; n = n->next)
                    335:                                /* Do nothing. */ ;
                    336:                        n->next = &roffs[i];
                    337:                } else
                    338:                        hash[buc] = &roffs[i];
                    339:        }
                    340: }
                    341:
1.67      kristaps  342: /*
                    343:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    344:  * the nil-terminated string name could be found.
                    345:  */
                    346: static enum rofft
1.155     kristaps  347: roffhash_find(const char *p, size_t s)
1.67      kristaps  348: {
1.85      kristaps  349:        int              buc;
                    350:        struct roffmac  *n;
1.67      kristaps  351:
1.85      kristaps  352:        /*
                    353:         * libroff has an extremely simple hashtable, for the time
                    354:         * being, which simply keys on the first character, which must
                    355:         * be printable, then walks a chain.  It works well enough until
                    356:         * optimised.
                    357:         */
                    358:
                    359:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    360:                return(ROFF_MAX);
                    361:
                    362:        buc = ROFF_HASH(p);
                    363:
                    364:        if (NULL == (n = hash[buc]))
                    365:                return(ROFF_MAX);
                    366:        for ( ; n; n = n->next)
1.106     kristaps  367:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  368:                        return((enum rofft)(n - roffs));
1.67      kristaps  369:
                    370:        return(ROFF_MAX);
                    371: }
                    372:
                    373: /*
                    374:  * Pop the current node off of the stack of roff instructions currently
                    375:  * pending.
                    376:  */
                    377: static void
                    378: roffnode_pop(struct roff *r)
                    379: {
                    380:        struct roffnode *p;
                    381:
1.75      kristaps  382:        assert(r->last);
1.207     schwarze  383:        p = r->last;
1.82      kristaps  384:
1.75      kristaps  385:        r->last = r->last->parent;
1.106     kristaps  386:        free(p->name);
                    387:        free(p->end);
1.67      kristaps  388:        free(p);
                    389: }
                    390:
                    391: /*
                    392:  * Push a roff node onto the instruction stack.  This must later be
                    393:  * removed with roffnode_pop().
                    394:  */
1.98      schwarze  395: static void
1.106     kristaps  396: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    397:                int line, int col)
1.67      kristaps  398: {
                    399:        struct roffnode *p;
                    400:
1.98      schwarze  401:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  402:        p->tok = tok;
1.106     kristaps  403:        if (name)
                    404:                p->name = mandoc_strdup(name);
1.67      kristaps  405:        p->parent = r->last;
                    406:        p->line = line;
                    407:        p->col = col;
1.198     schwarze  408:        p->rule = p->parent ? p->parent->rule : 0;
1.67      kristaps  409:
                    410:        r->last = p;
                    411: }
                    412:
                    413: static void
                    414: roff_free1(struct roff *r)
                    415: {
1.176     schwarze  416:        struct tbl_node *tbl;
1.125     kristaps  417:        struct eqn_node *e;
1.167     kristaps  418:        int              i;
1.67      kristaps  419:
1.176     schwarze  420:        while (NULL != (tbl = r->first_tbl)) {
                    421:                r->first_tbl = tbl->next;
                    422:                tbl_free(tbl);
1.109     kristaps  423:        }
1.113     kristaps  424:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    425:
1.125     kristaps  426:        while (NULL != (e = r->first_eqn)) {
                    427:                r->first_eqn = e->next;
                    428:                eqn_free(e);
                    429:        }
                    430:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    431:
1.67      kristaps  432:        while (r->last)
                    433:                roffnode_pop(r);
1.109     kristaps  434:
1.223   ! schwarze  435:        free (r->rstack);
        !           436:        r->rstack = NULL;
        !           437:        r->rstacksz = 0;
        !           438:        r->rstackpos = -1;
        !           439:
        !           440:        roff_freereg(r->regtab);
        !           441:        r->regtab = NULL;
        !           442:
1.167     kristaps  443:        roff_freestr(r->strtab);
                    444:        roff_freestr(r->xmbtab);
                    445:        r->strtab = r->xmbtab = NULL;
                    446:
                    447:        if (r->xtab)
                    448:                for (i = 0; i < 128; i++)
                    449:                        free(r->xtab[i].p);
                    450:        free(r->xtab);
                    451:        r->xtab = NULL;
1.67      kristaps  452: }
                    453:
                    454: void
                    455: roff_reset(struct roff *r)
                    456: {
                    457:
                    458:        roff_free1(r);
1.174     kristaps  459:        r->control = 0;
1.67      kristaps  460: }
                    461:
                    462: void
                    463: roff_free(struct roff *r)
                    464: {
                    465:
                    466:        roff_free1(r);
                    467:        free(r);
                    468: }
                    469:
                    470: struct roff *
1.199     schwarze  471: roff_alloc(struct mparse *parse, int options)
1.67      kristaps  472: {
                    473:        struct roff     *r;
                    474:
1.98      schwarze  475:        r = mandoc_calloc(1, sizeof(struct roff));
1.128     kristaps  476:        r->parse = parse;
1.199     schwarze  477:        r->options = options;
1.82      kristaps  478:        r->rstackpos = -1;
1.207     schwarze  479:
1.155     kristaps  480:        roffhash_init();
1.141     kristaps  481:
1.67      kristaps  482:        return(r);
                    483: }
                    484:
1.94      kristaps  485: /*
1.206     schwarze  486:  * In the current line, expand escape sequences that tend to get
                    487:  * used in numerical expressions and conditional requests.
                    488:  * Also check the syntax of the remaining escape sequences.
1.154     kristaps  489:  */
1.172     schwarze  490: static enum rofferr
1.142     kristaps  491: roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos)
1.94      kristaps  492: {
1.208     schwarze  493:        char             ubuf[24]; /* buffer to print the number */
1.205     schwarze  494:        const char      *start; /* start of the string to process */
1.209     schwarze  495:        char            *stesc; /* start of an escape sequence ('\\') */
1.108     schwarze  496:        const char      *stnam; /* start of the name, after "[(*" */
                    497:        const char      *cp;    /* end of the name, e.g. before ']' */
                    498:        const char      *res;   /* the string to be substituted */
1.181     schwarze  499:        char            *nbuf;  /* new buffer to copy bufp to */
                    500:        size_t           maxl;  /* expected length of the escape name */
                    501:        size_t           naml;  /* actual length of the escape name */
                    502:        int              expand_count;  /* to avoid infinite loops */
1.206     schwarze  503:        int              npos;  /* position in numeric expression */
1.218     schwarze  504:        int              arg_complete; /* argument not interrupted by eol */
1.206     schwarze  505:        char             term;  /* character terminating the escape */
1.94      kristaps  506:
1.170     schwarze  507:        expand_count = 0;
1.205     schwarze  508:        start = *bufp + pos;
                    509:        stesc = strchr(start, '\0') - 1;
                    510:        while (stesc-- > start) {
1.170     schwarze  511:
1.205     schwarze  512:                /* Search backwards for the next backslash. */
                    513:
                    514:                if ('\\' != *stesc)
                    515:                        continue;
                    516:
                    517:                /* If it is escaped, skip it. */
                    518:
                    519:                for (cp = stesc - 1; cp >= start; cp--)
                    520:                        if ('\\' != *cp)
                    521:                                break;
                    522:
                    523:                if (0 == (stesc - cp) % 2) {
1.209     schwarze  524:                        stesc = (char *)cp;
1.205     schwarze  525:                        continue;
                    526:                }
1.108     schwarze  527:
1.206     schwarze  528:                /* Decide whether to expand or to check only. */
1.108     schwarze  529:
1.206     schwarze  530:                term = '\0';
1.205     schwarze  531:                cp = stesc + 1;
1.181     schwarze  532:                switch (*cp) {
1.207     schwarze  533:                case '*':
1.181     schwarze  534:                        res = NULL;
                    535:                        break;
1.207     schwarze  536:                case 'B':
1.206     schwarze  537:                        /* FALLTHROUGH */
1.207     schwarze  538:                case 'w':
1.206     schwarze  539:                        term = cp[1];
                    540:                        /* FALLTHROUGH */
1.207     schwarze  541:                case 'n':
1.181     schwarze  542:                        res = ubuf;
                    543:                        break;
                    544:                default:
1.205     schwarze  545:                        if (ESCAPE_ERROR == mandoc_escape(&cp, NULL, NULL))
1.219     schwarze  546:                                mandoc_vmsg(MANDOCERR_ESC_BAD,
                    547:                                    r->parse, ln, (int)(stesc - *bufp),
                    548:                                    "%.*s", (int)(cp - stesc), stesc);
1.205     schwarze  549:                        continue;
1.152     kristaps  550:                }
                    551:
1.205     schwarze  552:                if (EXPAND_LIMIT < ++expand_count) {
                    553:                        mandoc_msg(MANDOCERR_ROFFLOOP, r->parse,
                    554:                            ln, (int)(stesc - *bufp), NULL);
                    555:                        return(ROFF_IGN);
                    556:                }
1.108     schwarze  557:
                    558:                /*
                    559:                 * The third character decides the length
1.181     schwarze  560:                 * of the name of the string or register.
1.108     schwarze  561:                 * Save a pointer to the name.
                    562:                 */
                    563:
1.206     schwarze  564:                if ('\0' == term) {
                    565:                        switch (*++cp) {
1.207     schwarze  566:                        case '\0':
1.206     schwarze  567:                                maxl = 0;
                    568:                                break;
1.207     schwarze  569:                        case '(':
1.206     schwarze  570:                                cp++;
                    571:                                maxl = 2;
                    572:                                break;
1.207     schwarze  573:                        case '[':
1.206     schwarze  574:                                cp++;
                    575:                                term = ']';
                    576:                                maxl = 0;
                    577:                                break;
                    578:                        default:
                    579:                                maxl = 1;
                    580:                                break;
                    581:                        }
                    582:                } else {
                    583:                        cp += 2;
1.94      kristaps  584:                        maxl = 0;
                    585:                }
1.108     schwarze  586:                stnam = cp;
1.94      kristaps  587:
1.108     schwarze  588:                /* Advance to the end of the name. */
1.94      kristaps  589:
1.218     schwarze  590:                arg_complete = 1;
1.181     schwarze  591:                for (naml = 0; 0 == maxl || naml < maxl; naml++, cp++) {
1.153     kristaps  592:                        if ('\0' == *cp) {
1.219     schwarze  593:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
                    594:                                    ln, (int)(stesc - *bufp), stesc);
1.218     schwarze  595:                                arg_complete = 0;
1.206     schwarze  596:                                break;
1.153     kristaps  597:                        }
1.206     schwarze  598:                        if (0 == maxl && *cp == term) {
                    599:                                cp++;
1.94      kristaps  600:                                break;
1.206     schwarze  601:                        }
1.94      kristaps  602:                }
                    603:
1.108     schwarze  604:                /*
                    605:                 * Retrieve the replacement string; if it is
                    606:                 * undefined, resume searching for escapes.
                    607:                 */
                    608:
1.206     schwarze  609:                switch (stesc[1]) {
1.207     schwarze  610:                case '*':
1.218     schwarze  611:                        if (arg_complete)
                    612:                                res = roff_getstrn(r, stnam, naml);
1.206     schwarze  613:                        break;
1.207     schwarze  614:                case 'B':
1.206     schwarze  615:                        npos = 0;
1.218     schwarze  616:                        ubuf[0] = arg_complete &&
                    617:                            roff_evalnum(stnam, &npos, NULL, 0) &&
                    618:                            stnam + npos + 1 == cp ? '1' : '0';
1.206     schwarze  619:                        ubuf[1] = '\0';
                    620:                        break;
1.207     schwarze  621:                case 'n':
1.218     schwarze  622:                        if (arg_complete)
                    623:                                (void)snprintf(ubuf, sizeof(ubuf), "%d",
                    624:                                    roff_getregn(r, stnam, naml));
                    625:                        else
                    626:                                ubuf[0] = '\0';
1.206     schwarze  627:                        break;
1.207     schwarze  628:                case 'w':
1.218     schwarze  629:                        /* use even incomplete args */
1.208     schwarze  630:                        (void)snprintf(ubuf, sizeof(ubuf), "%d",
1.206     schwarze  631:                            24 * (int)naml);
                    632:                        break;
                    633:                }
1.94      kristaps  634:
                    635:                if (NULL == res) {
1.219     schwarze  636:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
                    637:                            r->parse, ln, (int)(stesc - *bufp),
                    638:                            "%.*s", (int)naml, stnam);
1.142     kristaps  639:                        res = "";
1.94      kristaps  640:                }
                    641:
1.108     schwarze  642:                /* Replace the escape sequence by the string. */
                    643:
1.209     schwarze  644:                *stesc = '\0';
                    645:                *szp = mandoc_asprintf(&nbuf, "%s%s%s",
                    646:                    *bufp, res, cp) + 1;
1.94      kristaps  647:
1.205     schwarze  648:                /* Prepare for the next replacement. */
1.94      kristaps  649:
1.205     schwarze  650:                start = nbuf + pos;
1.209     schwarze  651:                stesc = nbuf + (stesc - *bufp) + strlen(res);
1.94      kristaps  652:                free(*bufp);
1.181     schwarze  653:                *bufp = nbuf;
1.154     kristaps  654:        }
1.172     schwarze  655:        return(ROFF_CONT);
1.154     kristaps  656: }
                    657:
                    658: /*
1.178     schwarze  659:  * Process text streams:
                    660:  * Convert all breakable hyphens into ASCII_HYPH.
                    661:  * Decrement and spring input line trap.
1.154     kristaps  662:  */
                    663: static enum rofferr
1.178     schwarze  664: roff_parsetext(char **bufp, size_t *szp, int pos, int *offs)
1.154     kristaps  665: {
                    666:        size_t           sz;
                    667:        const char      *start;
1.178     schwarze  668:        char            *p;
                    669:        int              isz;
1.154     kristaps  670:        enum mandoc_esc  esc;
                    671:
1.178     schwarze  672:        start = p = *bufp + pos;
1.154     kristaps  673:
                    674:        while ('\0' != *p) {
                    675:                sz = strcspn(p, "-\\");
                    676:                p += sz;
                    677:
1.159     kristaps  678:                if ('\0' == *p)
                    679:                        break;
                    680:
1.154     kristaps  681:                if ('\\' == *p) {
                    682:                        /* Skip over escapes. */
                    683:                        p++;
1.189     schwarze  684:                        esc = mandoc_escape((const char **)&p, NULL, NULL);
1.154     kristaps  685:                        if (ESCAPE_ERROR == esc)
                    686:                                break;
1.155     kristaps  687:                        continue;
1.159     kristaps  688:                } else if (p == start) {
1.158     kristaps  689:                        p++;
1.155     kristaps  690:                        continue;
1.158     kristaps  691:                }
1.155     kristaps  692:
1.171     schwarze  693:                if (isalpha((unsigned char)p[-1]) &&
                    694:                    isalpha((unsigned char)p[1]))
1.155     kristaps  695:                        *p = ASCII_HYPH;
                    696:                p++;
1.94      kristaps  697:        }
                    698:
1.178     schwarze  699:        /* Spring the input line trap. */
                    700:        if (1 == roffit_lines) {
1.202     schwarze  701:                isz = mandoc_asprintf(&p, "%s\n.%s", *bufp, roffit_macro);
1.178     schwarze  702:                free(*bufp);
                    703:                *bufp = p;
                    704:                *szp = isz + 1;
                    705:                *offs = 0;
                    706:                free(roffit_macro);
                    707:                roffit_lines = 0;
                    708:                return(ROFF_REPARSE);
                    709:        } else if (1 < roffit_lines)
                    710:                --roffit_lines;
1.154     kristaps  711:        return(ROFF_CONT);
1.94      kristaps  712: }
                    713:
1.67      kristaps  714: enum rofferr
1.207     schwarze  715: roff_parseln(struct roff *r, int ln, char **bufp,
1.90      kristaps  716:                size_t *szp, int pos, int *offs)
1.67      kristaps  717: {
                    718:        enum rofft       t;
1.109     kristaps  719:        enum rofferr     e;
1.130     kristaps  720:        int              ppos, ctl;
1.79      kristaps  721:
                    722:        /*
1.94      kristaps  723:         * Run the reserved-word filter only if we have some reserved
                    724:         * words to fill in.
                    725:         */
                    726:
1.172     schwarze  727:        e = roff_res(r, bufp, szp, ln, pos);
                    728:        if (ROFF_IGN == e)
                    729:                return(e);
                    730:        assert(ROFF_CONT == e);
1.94      kristaps  731:
1.130     kristaps  732:        ppos = pos;
1.174     kristaps  733:        ctl = roff_getcontrol(r, *bufp, &pos);
1.130     kristaps  734:
1.94      kristaps  735:        /*
1.79      kristaps  736:         * First, if a scope is open and we're not a macro, pass the
                    737:         * text through the macro's filter.  If a scope isn't open and
                    738:         * we're not a macro, just let it through.
1.125     kristaps  739:         * Finally, if there's an equation scope open, divert it into it
                    740:         * no matter our state.
1.79      kristaps  741:         */
1.74      kristaps  742:
1.130     kristaps  743:        if (r->last && ! ctl) {
1.78      kristaps  744:                t = r->last->tok;
                    745:                assert(roffs[t].text);
1.207     schwarze  746:                e = (*roffs[t].text)(r, t, bufp, szp, ln, pos, pos, offs);
1.109     kristaps  747:                assert(ROFF_IGN == e || ROFF_CONT == e);
1.125     kristaps  748:                if (ROFF_CONT != e)
                    749:                        return(e);
1.182     schwarze  750:        }
                    751:        if (r->eqn)
                    752:                return(eqn_read(&r->eqn, ln, *bufp, ppos, offs));
                    753:        if ( ! ctl) {
1.125     kristaps  754:                if (r->tbl)
1.130     kristaps  755:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.178     schwarze  756:                return(roff_parsetext(bufp, szp, pos, offs));
1.182     schwarze  757:        }
1.67      kristaps  758:
1.79      kristaps  759:        /*
                    760:         * If a scope is open, go to the child handler for that macro,
                    761:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  762:         * Don't do so if an equation is open.
1.79      kristaps  763:         */
1.78      kristaps  764:
1.79      kristaps  765:        if (r->last) {
                    766:                t = r->last->tok;
                    767:                assert(roffs[t].sub);
1.207     schwarze  768:                return((*roffs[t].sub)(r, t, bufp, szp,
                    769:                    ln, ppos, pos, offs));
1.79      kristaps  770:        }
1.78      kristaps  771:
1.79      kristaps  772:        /*
                    773:         * Lastly, as we've no scope open, try to look up and execute
                    774:         * the new macro.  If no macro is found, simply return and let
                    775:         * the compilers handle it.
                    776:         */
1.67      kristaps  777:
1.214     schwarze  778:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos, ln, ppos)))
1.79      kristaps  779:                return(ROFF_CONT);
1.67      kristaps  780:
1.75      kristaps  781:        assert(roffs[t].proc);
1.207     schwarze  782:        return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs));
1.74      kristaps  783: }
                    784:
1.117     kristaps  785: void
1.74      kristaps  786: roff_endparse(struct roff *r)
                    787: {
                    788:
1.110     kristaps  789:        if (r->last)
1.221     schwarze  790:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    791:                    r->last->line, r->last->col,
                    792:                    roffs[r->last->tok].name);
1.117     kristaps  793:
1.125     kristaps  794:        if (r->eqn) {
1.221     schwarze  795:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    796:                    r->eqn->eqn.ln, r->eqn->eqn.pos, "EQ");
1.151     kristaps  797:                eqn_end(&r->eqn);
1.125     kristaps  798:        }
                    799:
1.117     kristaps  800:        if (r->tbl) {
1.221     schwarze  801:                mandoc_msg(MANDOCERR_BLK_NOEND, r->parse,
                    802:                    r->tbl->line, r->tbl->pos, "TS");
1.151     kristaps  803:                tbl_end(&r->tbl);
1.117     kristaps  804:        }
1.67      kristaps  805: }
                    806:
                    807: /*
                    808:  * Parse a roff node's type from the input buffer.  This must be in the
                    809:  * form of ".foo xxx" in the usual way.
                    810:  */
                    811: static enum rofft
1.214     schwarze  812: roff_parse(struct roff *r, char *buf, int *pos, int ln, int ppos)
1.67      kristaps  813: {
1.214     schwarze  814:        char            *cp;
1.106     kristaps  815:        const char      *mac;
                    816:        size_t           maclen;
1.67      kristaps  817:        enum rofft       t;
                    818:
1.214     schwarze  819:        cp = buf + *pos;
                    820:
                    821:        if ('\0' == *cp || '"' == *cp || '\t' == *cp || ' ' == *cp)
1.67      kristaps  822:                return(ROFF_MAX);
                    823:
1.214     schwarze  824:        mac = cp;
                    825:        maclen = roff_getname(r, &cp, ln, ppos);
1.67      kristaps  826:
1.106     kristaps  827:        t = (r->current_string = roff_getstrn(r, mac, maclen))
1.155     kristaps  828:            ? ROFF_USERDEF : roffhash_find(mac, maclen);
1.67      kristaps  829:
1.214     schwarze  830:        if (ROFF_MAX != t)
                    831:                *pos = cp - buf;
1.67      kristaps  832:
                    833:        return(t);
                    834: }
                    835:
                    836: static enum rofferr
1.76      kristaps  837: roff_cblock(ROFF_ARGS)
1.67      kristaps  838: {
                    839:
1.79      kristaps  840:        /*
                    841:         * A block-close `..' should only be invoked as a child of an
                    842:         * ignore macro, otherwise raise a warning and just ignore it.
                    843:         */
                    844:
1.76      kristaps  845:        if (NULL == r->last) {
1.221     schwarze  846:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    847:                    ln, ppos, "..");
1.76      kristaps  848:                return(ROFF_IGN);
                    849:        }
1.67      kristaps  850:
1.81      kristaps  851:        switch (r->last->tok) {
1.207     schwarze  852:        case ROFF_am:
1.220     schwarze  853:                /* ROFF_am1 is remapped to ROFF_am in roff_block(). */
1.81      kristaps  854:                /* FALLTHROUGH */
1.207     schwarze  855:        case ROFF_ami:
1.81      kristaps  856:                /* FALLTHROUGH */
1.207     schwarze  857:        case ROFF_de:
1.108     schwarze  858:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  859:                /* FALLTHROUGH */
1.207     schwarze  860:        case ROFF_dei:
1.81      kristaps  861:                /* FALLTHROUGH */
1.207     schwarze  862:        case ROFF_ig:
1.81      kristaps  863:                break;
                    864:        default:
1.221     schwarze  865:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    866:                    ln, ppos, "..");
1.67      kristaps  867:                return(ROFF_IGN);
1.76      kristaps  868:        }
1.67      kristaps  869:
1.76      kristaps  870:        if ((*bufp)[pos])
1.217     schwarze  871:                mandoc_vmsg(MANDOCERR_ARG_SKIP, r->parse, ln, pos,
                    872:                    ".. %s", *bufp + pos);
1.71      kristaps  873:
                    874:        roffnode_pop(r);
1.76      kristaps  875:        roffnode_cleanscope(r);
                    876:        return(ROFF_IGN);
1.71      kristaps  877:
1.67      kristaps  878: }
                    879:
1.76      kristaps  880: static void
                    881: roffnode_cleanscope(struct roff *r)
1.67      kristaps  882: {
                    883:
1.76      kristaps  884:        while (r->last) {
1.173     schwarze  885:                if (--r->last->endspan != 0)
1.76      kristaps  886:                        break;
                    887:                roffnode_pop(r);
                    888:        }
1.67      kristaps  889: }
                    890:
1.195     schwarze  891: static void
                    892: roff_ccond(struct roff *r, int ln, int ppos)
1.74      kristaps  893: {
                    894:
1.76      kristaps  895:        if (NULL == r->last) {
1.221     schwarze  896:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    897:                    ln, ppos, "\\}");
1.195     schwarze  898:                return;
1.76      kristaps  899:        }
                    900:
1.82      kristaps  901:        switch (r->last->tok) {
1.207     schwarze  902:        case ROFF_el:
1.82      kristaps  903:                /* FALLTHROUGH */
1.207     schwarze  904:        case ROFF_ie:
1.82      kristaps  905:                /* FALLTHROUGH */
1.207     schwarze  906:        case ROFF_if:
1.82      kristaps  907:                break;
                    908:        default:
1.221     schwarze  909:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    910:                    ln, ppos, "\\}");
1.195     schwarze  911:                return;
1.75      kristaps  912:        }
                    913:
1.76      kristaps  914:        if (r->last->endspan > -1) {
1.221     schwarze  915:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                    916:                    ln, ppos, "\\}");
1.195     schwarze  917:                return;
1.76      kristaps  918:        }
                    919:
1.75      kristaps  920:        roffnode_pop(r);
1.76      kristaps  921:        roffnode_cleanscope(r);
1.195     schwarze  922:        return;
1.76      kristaps  923: }
                    924:
                    925: static enum rofferr
1.80      kristaps  926: roff_block(ROFF_ARGS)
1.76      kristaps  927: {
1.220     schwarze  928:        const char      *name;
                    929:        char            *iname, *cp;
1.213     schwarze  930:        size_t           namesz;
1.106     kristaps  931:
1.220     schwarze  932:        /* Ignore groff compatibility mode for now. */
1.76      kristaps  933:
1.220     schwarze  934:        if (ROFF_de1 == tok)
                    935:                tok = ROFF_de;
                    936:        else if (ROFF_am1 == tok)
                    937:                tok = ROFF_am;
                    938:
                    939:        /* Parse the macro name argument. */
                    940:
                    941:        cp = *bufp + pos;
                    942:        if (ROFF_ig == tok) {
                    943:                iname = NULL;
                    944:                namesz = 0;
                    945:        } else {
                    946:                iname = cp;
                    947:                namesz = roff_getname(r, &cp, ln, ppos);
                    948:                iname[namesz] = '\0';
                    949:        }
1.107     kristaps  950:
1.220     schwarze  951:        /* Resolve the macro name argument if it is indirect. */
1.107     kristaps  952:
1.220     schwarze  953:        if (namesz && (ROFF_dei == tok || ROFF_ami == tok)) {
                    954:                if (NULL == (name = roff_getstrn(r, iname, namesz))) {
                    955:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
                    956:                            r->parse, ln, (int)(iname - *bufp),
                    957:                            "%.*s", (int)namesz, iname);
                    958:                        namesz = 0;
                    959:                } else
                    960:                        namesz = strlen(name);
                    961:        } else
                    962:                name = iname;
1.107     kristaps  963:
1.220     schwarze  964:        if (0 == namesz && ROFF_ig != tok) {
                    965:                mandoc_msg(MANDOCERR_REQ_EMPTY, r->parse,
                    966:                    ln, ppos, roffs[tok].name);
                    967:                return(ROFF_IGN);
                    968:        }
1.80      kristaps  969:
1.106     kristaps  970:        roffnode_push(r, tok, name, ln, ppos);
                    971:
                    972:        /*
                    973:         * At the beginning of a `de' macro, clear the existing string
                    974:         * with the same name, if there is one.  New content will be
1.193     schwarze  975:         * appended from roff_block_text() in multiline mode.
1.106     kristaps  976:         */
1.107     kristaps  977:
1.220     schwarze  978:        if (ROFF_de == tok || ROFF_dei == tok)
1.213     schwarze  979:                roff_setstrn(&r->strtab, name, namesz, "", 0, 0);
1.76      kristaps  980:
1.213     schwarze  981:        if ('\0' == *cp)
1.78      kristaps  982:                return(ROFF_IGN);
                    983:
1.220     schwarze  984:        /* Get the custom end marker. */
1.107     kristaps  985:
1.220     schwarze  986:        iname = cp;
1.213     schwarze  987:        namesz = roff_getname(r, &cp, ln, ppos);
1.220     schwarze  988:
                    989:        /* Resolve the end marker if it is indirect. */
                    990:
                    991:        if (namesz && (ROFF_dei == tok || ROFF_ami == tok)) {
                    992:                if (NULL == (name = roff_getstrn(r, iname, namesz))) {
                    993:                        mandoc_vmsg(MANDOCERR_STR_UNDEF,
                    994:                            r->parse, ln, (int)(iname - *bufp),
                    995:                            "%.*s", (int)namesz, iname);
                    996:                        namesz = 0;
                    997:                } else
                    998:                        namesz = strlen(name);
                    999:        } else
                   1000:                name = iname;
                   1001:
1.213     schwarze 1002:        if (namesz)
                   1003:                r->last->end = mandoc_strndup(name, namesz);
1.78      kristaps 1004:
1.213     schwarze 1005:        if ('\0' != *cp)
1.217     schwarze 1006:                mandoc_vmsg(MANDOCERR_ARG_EXCESS, r->parse,
                   1007:                    ln, pos, ".%s ... %s", roffs[tok].name, cp);
1.74      kristaps 1008:
1.78      kristaps 1009:        return(ROFF_IGN);
                   1010: }
                   1011:
                   1012: static enum rofferr
1.80      kristaps 1013: roff_block_sub(ROFF_ARGS)
1.79      kristaps 1014: {
                   1015:        enum rofft      t;
                   1016:        int             i, j;
                   1017:
                   1018:        /*
                   1019:         * First check whether a custom macro exists at this level.  If
                   1020:         * it does, then check against it.  This is some of groff's
                   1021:         * stranger behaviours.  If we encountered a custom end-scope
                   1022:         * tag and that tag also happens to be a "real" macro, then we
                   1023:         * need to try interpreting it again as a real macro.  If it's
                   1024:         * not, then return ignore.  Else continue.
                   1025:         */
                   1026:
                   1027:        if (r->last->end) {
1.130     kristaps 1028:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.79      kristaps 1029:                        if ((*bufp)[i] != r->last->end[j])
                   1030:                                break;
                   1031:
1.207     schwarze 1032:                if ('\0' == r->last->end[j] &&
                   1033:                    ('\0' == (*bufp)[i] ||
                   1034:                     ' '  == (*bufp)[i] ||
                   1035:                     '\t' == (*bufp)[i])) {
1.79      kristaps 1036:                        roffnode_pop(r);
                   1037:                        roffnode_cleanscope(r);
                   1038:
1.130     kristaps 1039:                        while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
                   1040:                                i++;
                   1041:
                   1042:                        pos = i;
1.214     schwarze 1043:                        if (ROFF_MAX != roff_parse(r, *bufp, &pos, ln, ppos))
1.79      kristaps 1044:                                return(ROFF_RERUN);
                   1045:                        return(ROFF_IGN);
                   1046:                }
                   1047:        }
                   1048:
                   1049:        /*
                   1050:         * If we have no custom end-query or lookup failed, then try
                   1051:         * pulling it out of the hashtable.
                   1052:         */
                   1053:
1.214     schwarze 1054:        t = roff_parse(r, *bufp, &pos, ln, ppos);
1.79      kristaps 1055:
1.106     kristaps 1056:        if (ROFF_cblock != t) {
1.220     schwarze 1057:                if (ROFF_ig != tok)
1.193     schwarze 1058:                        roff_setstr(r, r->last->name, *bufp + ppos, 2);
1.79      kristaps 1059:                return(ROFF_IGN);
1.106     kristaps 1060:        }
1.79      kristaps 1061:
                   1062:        assert(roffs[t].proc);
1.207     schwarze 1063:        return((*roffs[t].proc)(r, t, bufp, szp, ln, ppos, pos, offs));
1.79      kristaps 1064: }
                   1065:
                   1066: static enum rofferr
1.80      kristaps 1067: roff_block_text(ROFF_ARGS)
1.78      kristaps 1068: {
                   1069:
1.220     schwarze 1070:        if (ROFF_ig != tok)
1.193     schwarze 1071:                roff_setstr(r, r->last->name, *bufp + pos, 2);
1.106     kristaps 1072:
1.78      kristaps 1073:        return(ROFF_IGN);
                   1074: }
                   1075:
                   1076: static enum rofferr
1.82      kristaps 1077: roff_cond_sub(ROFF_ARGS)
                   1078: {
                   1079:        enum rofft       t;
1.139     kristaps 1080:        char            *ep;
1.198     schwarze 1081:        int              rr;
1.82      kristaps 1082:
                   1083:        rr = r->last->rule;
1.139     kristaps 1084:        roffnode_cleanscope(r);
1.214     schwarze 1085:        t = roff_parse(r, *bufp, &pos, ln, ppos);
1.82      kristaps 1086:
1.139     kristaps 1087:        /*
1.177     schwarze 1088:         * Fully handle known macros when they are structurally
                   1089:         * required or when the conditional evaluated to true.
1.87      kristaps 1090:         */
                   1091:
1.177     schwarze 1092:        if ((ROFF_MAX != t) &&
1.198     schwarze 1093:            (rr || ROFFMAC_STRUCT & roffs[t].flags)) {
1.177     schwarze 1094:                assert(roffs[t].proc);
                   1095:                return((*roffs[t].proc)(r, t, bufp, szp,
1.207     schwarze 1096:                    ln, ppos, pos, offs));
1.177     schwarze 1097:        }
1.144     kristaps 1098:
1.196     schwarze 1099:        /*
                   1100:         * If `\}' occurs on a macro line without a preceding macro,
                   1101:         * drop the line completely.
                   1102:         */
                   1103:
                   1104:        ep = *bufp + pos;
                   1105:        if ('\\' == ep[0] && '}' == ep[1])
1.198     schwarze 1106:                rr = 0;
1.196     schwarze 1107:
1.177     schwarze 1108:        /* Always check for the closing delimiter `\}'. */
1.144     kristaps 1109:
1.177     schwarze 1110:        while (NULL != (ep = strchr(ep, '\\'))) {
1.197     schwarze 1111:                if ('}' == *(++ep)) {
                   1112:                        *ep = '&';
                   1113:                        roff_ccond(r, ln, ep - *bufp - 1);
                   1114:                }
                   1115:                ++ep;
1.177     schwarze 1116:        }
1.198     schwarze 1117:        return(rr ? ROFF_CONT : ROFF_IGN);
1.82      kristaps 1118: }
                   1119:
                   1120: static enum rofferr
                   1121: roff_cond_text(ROFF_ARGS)
1.78      kristaps 1122: {
1.140     kristaps 1123:        char            *ep;
1.198     schwarze 1124:        int              rr;
1.82      kristaps 1125:
                   1126:        rr = r->last->rule;
1.140     kristaps 1127:        roffnode_cleanscope(r);
1.82      kristaps 1128:
1.197     schwarze 1129:        ep = *bufp + pos;
                   1130:        while (NULL != (ep = strchr(ep, '\\'))) {
                   1131:                if ('}' == *(++ep)) {
                   1132:                        *ep = '&';
                   1133:                        roff_ccond(r, ln, ep - *bufp - 1);
                   1134:                }
                   1135:                ++ep;
1.78      kristaps 1136:        }
1.198     schwarze 1137:        return(rr ? ROFF_CONT : ROFF_IGN);
1.74      kristaps 1138: }
                   1139:
1.204     schwarze 1140: /*
                   1141:  * Parse a single signed integer number.  Stop at the first non-digit.
                   1142:  * If there is at least one digit, return success and advance the
                   1143:  * parse point, else return failure and let the parse point unchanged.
                   1144:  * Ignore overflows, treat them just like the C language.
                   1145:  */
1.184     schwarze 1146: static int
                   1147: roff_getnum(const char *v, int *pos, int *res)
                   1148: {
1.206     schwarze 1149:        int      myres, n, p;
                   1150:
                   1151:        if (NULL == res)
                   1152:                res = &myres;
1.184     schwarze 1153:
                   1154:        p = *pos;
                   1155:        n = v[p] == '-';
                   1156:        if (n)
                   1157:                p++;
                   1158:
                   1159:        for (*res = 0; isdigit((unsigned char)v[p]); p++)
1.204     schwarze 1160:                *res = 10 * *res + v[p] - '0';
1.184     schwarze 1161:        if (p == *pos + n)
                   1162:                return 0;
                   1163:
                   1164:        if (n)
                   1165:                *res = -*res;
                   1166:
                   1167:        *pos = p;
                   1168:        return 1;
                   1169: }
                   1170:
1.198     schwarze 1171: /*
                   1172:  * Evaluate a string comparison condition.
                   1173:  * The first character is the delimiter.
                   1174:  * Succeed if the string up to its second occurrence
                   1175:  * matches the string up to its third occurence.
                   1176:  * Advance the cursor after the third occurrence
                   1177:  * or lacking that, to the end of the line.
                   1178:  */
                   1179: static int
                   1180: roff_evalstrcond(const char *v, int *pos)
                   1181: {
                   1182:        const char      *s1, *s2, *s3;
                   1183:        int              match;
                   1184:
                   1185:        match = 0;
                   1186:        s1 = v + *pos;          /* initial delimiter */
                   1187:        s2 = s1 + 1;            /* for scanning the first string */
                   1188:        s3 = strchr(s2, *s1);   /* for scanning the second string */
                   1189:
                   1190:        if (NULL == s3)         /* found no middle delimiter */
                   1191:                goto out;
                   1192:
                   1193:        while ('\0' != *++s3) {
                   1194:                if (*s2 != *s3) {  /* mismatch */
                   1195:                        s3 = strchr(s3, *s1);
                   1196:                        break;
                   1197:                }
                   1198:                if (*s3 == *s1) {  /* found the final delimiter */
                   1199:                        match = 1;
                   1200:                        break;
                   1201:                }
                   1202:                s2++;
                   1203:        }
                   1204:
                   1205: out:
                   1206:        if (NULL == s3)
                   1207:                s3 = strchr(s2, '\0');
                   1208:        else
                   1209:                s3++;
                   1210:        *pos = s3 - v;
                   1211:        return(match);
                   1212: }
                   1213:
1.204     schwarze 1214: /*
                   1215:  * Evaluate an optionally negated single character, numerical,
                   1216:  * or string condition.
                   1217:  */
1.198     schwarze 1218: static int
1.88      kristaps 1219: roff_evalcond(const char *v, int *pos)
                   1220: {
1.204     schwarze 1221:        int      wanttrue, number;
1.88      kristaps 1222:
1.198     schwarze 1223:        if ('!' == v[*pos]) {
                   1224:                wanttrue = 0;
                   1225:                (*pos)++;
                   1226:        } else
                   1227:                wanttrue = 1;
                   1228:
1.88      kristaps 1229:        switch (v[*pos]) {
1.207     schwarze 1230:        case 'n':
1.198     schwarze 1231:                /* FALLTHROUGH */
1.207     schwarze 1232:        case 'o':
1.88      kristaps 1233:                (*pos)++;
1.198     schwarze 1234:                return(wanttrue);
1.207     schwarze 1235:        case 'c':
1.198     schwarze 1236:                /* FALLTHROUGH */
1.207     schwarze 1237:        case 'd':
1.198     schwarze 1238:                /* FALLTHROUGH */
1.207     schwarze 1239:        case 'e':
1.88      kristaps 1240:                /* FALLTHROUGH */
1.207     schwarze 1241:        case 'r':
1.88      kristaps 1242:                /* FALLTHROUGH */
1.207     schwarze 1243:        case 't':
1.88      kristaps 1244:                (*pos)++;
1.198     schwarze 1245:                return(!wanttrue);
1.88      kristaps 1246:        default:
                   1247:                break;
                   1248:        }
                   1249:
1.204     schwarze 1250:        if (roff_evalnum(v, pos, &number, 0))
                   1251:                return((number > 0) == wanttrue);
                   1252:        else
1.198     schwarze 1253:                return(roff_evalstrcond(v, pos) == wanttrue);
1.88      kristaps 1254: }
                   1255:
1.74      kristaps 1256: static enum rofferr
1.103     kristaps 1257: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1258: {
1.123     schwarze 1259:
1.89      kristaps 1260:        return(ROFF_IGN);
                   1261: }
                   1262:
1.104     kristaps 1263: static enum rofferr
1.82      kristaps 1264: roff_cond(ROFF_ARGS)
1.74      kristaps 1265: {
1.173     schwarze 1266:
                   1267:        roffnode_push(r, tok, NULL, ln, ppos);
1.74      kristaps 1268:
1.207     schwarze 1269:        /*
1.134     kristaps 1270:         * An `.el' has no conditional body: it will consume the value
                   1271:         * of the current rstack entry set in prior `ie' calls or
1.207     schwarze 1272:         * defaults to DENY.
1.134     kristaps 1273:         *
                   1274:         * If we're not an `el', however, then evaluate the conditional.
                   1275:         */
1.133     kristaps 1276:
1.173     schwarze 1277:        r->last->rule = ROFF_el == tok ?
1.207     schwarze 1278:            (r->rstackpos < 0 ? 0 : r->rstack[r->rstackpos--]) :
                   1279:            roff_evalcond(*bufp, &pos);
1.77      kristaps 1280:
1.134     kristaps 1281:        /*
                   1282:         * An if-else will put the NEGATION of the current evaluated
                   1283:         * conditional into the stack of rules.
                   1284:         */
                   1285:
1.84      schwarze 1286:        if (ROFF_ie == tok) {
1.223   ! schwarze 1287:                if (r->rstackpos + 1 == r->rstacksz) {
        !          1288:                        r->rstacksz += 16;
        !          1289:                        r->rstack = mandoc_reallocarray(r->rstack,
        !          1290:                            r->rstacksz, sizeof(int));
1.134     kristaps 1291:                }
1.198     schwarze 1292:                r->rstack[++r->rstackpos] = !r->last->rule;
1.82      kristaps 1293:        }
1.88      kristaps 1294:
                   1295:        /* If the parent has false as its rule, then so do we. */
                   1296:
1.198     schwarze 1297:        if (r->last->parent && !r->last->parent->rule)
                   1298:                r->last->rule = 0;
1.88      kristaps 1299:
                   1300:        /*
1.173     schwarze 1301:         * Determine scope.
                   1302:         * If there is nothing on the line after the conditional,
                   1303:         * not even whitespace, use next-line scope.
1.88      kristaps 1304:         */
1.74      kristaps 1305:
1.173     schwarze 1306:        if ('\0' == (*bufp)[pos]) {
                   1307:                r->last->endspan = 2;
                   1308:                goto out;
                   1309:        }
                   1310:
                   1311:        while (' ' == (*bufp)[pos])
                   1312:                pos++;
                   1313:
                   1314:        /* An opening brace requests multiline scope. */
1.75      kristaps 1315:
                   1316:        if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
                   1317:                r->last->endspan = -1;
                   1318:                pos += 2;
1.173     schwarze 1319:                goto out;
1.207     schwarze 1320:        }
1.74      kristaps 1321:
1.77      kristaps 1322:        /*
1.173     schwarze 1323:         * Anything else following the conditional causes
                   1324:         * single-line scope.  Warn if the scope contains
                   1325:         * nothing but trailing whitespace.
1.77      kristaps 1326:         */
                   1327:
1.75      kristaps 1328:        if ('\0' == (*bufp)[pos])
1.216     schwarze 1329:                mandoc_msg(MANDOCERR_COND_EMPTY, r->parse,
                   1330:                    ln, ppos, roffs[tok].name);
1.77      kristaps 1331:
1.173     schwarze 1332:        r->last->endspan = 1;
1.74      kristaps 1333:
1.173     schwarze 1334: out:
1.75      kristaps 1335:        *offs = pos;
                   1336:        return(ROFF_RERUN);
1.83      schwarze 1337: }
                   1338:
                   1339: static enum rofferr
1.92      schwarze 1340: roff_ds(ROFF_ARGS)
                   1341: {
1.212     schwarze 1342:        char            *string;
                   1343:        const char      *name;
                   1344:        size_t           namesz;
1.96      kristaps 1345:
                   1346:        /*
1.212     schwarze 1347:         * The first word is the name of the string.
                   1348:         * If it is empty or terminated by an escape sequence,
                   1349:         * abort the `ds' request without defining anything.
1.96      kristaps 1350:         */
1.92      schwarze 1351:
1.212     schwarze 1352:        name = string = *bufp + pos;
1.92      schwarze 1353:        if ('\0' == *name)
                   1354:                return(ROFF_IGN);
                   1355:
1.212     schwarze 1356:        namesz = roff_getname(r, &string, ln, pos);
                   1357:        if ('\\' == name[namesz])
                   1358:                return(ROFF_IGN);
                   1359:
                   1360:        /* Read past the initial double-quote, if any. */
1.121     schwarze 1361:        if ('"' == *string)
1.92      schwarze 1362:                string++;
                   1363:
1.96      kristaps 1364:        /* The rest is the value. */
1.212     schwarze 1365:        roff_setstrn(&r->strtab, name, namesz, string, strlen(string),
                   1366:            ROFF_as == tok);
1.92      schwarze 1367:        return(ROFF_IGN);
                   1368: }
                   1369:
1.204     schwarze 1370: /*
                   1371:  * Parse a single operator, one or two characters long.
                   1372:  * If the operator is recognized, return success and advance the
                   1373:  * parse point, else return failure and let the parse point unchanged.
                   1374:  */
                   1375: static int
                   1376: roff_getop(const char *v, int *pos, char *res)
                   1377: {
                   1378:
                   1379:        *res = v[*pos];
                   1380:
                   1381:        switch (*res) {
1.207     schwarze 1382:        case '+':
1.204     schwarze 1383:                /* FALLTHROUGH */
1.207     schwarze 1384:        case '-':
1.204     schwarze 1385:                /* FALLTHROUGH */
1.207     schwarze 1386:        case '*':
1.204     schwarze 1387:                /* FALLTHROUGH */
1.207     schwarze 1388:        case '/':
1.204     schwarze 1389:                /* FALLTHROUGH */
1.207     schwarze 1390:        case '%':
1.204     schwarze 1391:                /* FALLTHROUGH */
1.207     schwarze 1392:        case '&':
1.204     schwarze 1393:                /* FALLTHROUGH */
1.207     schwarze 1394:        case ':':
1.204     schwarze 1395:                break;
                   1396:        case '<':
                   1397:                switch (v[*pos + 1]) {
1.207     schwarze 1398:                case '=':
1.204     schwarze 1399:                        *res = 'l';
                   1400:                        (*pos)++;
                   1401:                        break;
1.207     schwarze 1402:                case '>':
1.204     schwarze 1403:                        *res = '!';
                   1404:                        (*pos)++;
                   1405:                        break;
1.207     schwarze 1406:                case '?':
1.204     schwarze 1407:                        *res = 'i';
                   1408:                        (*pos)++;
                   1409:                        break;
                   1410:                default:
                   1411:                        break;
                   1412:                }
                   1413:                break;
                   1414:        case '>':
                   1415:                switch (v[*pos + 1]) {
1.207     schwarze 1416:                case '=':
1.204     schwarze 1417:                        *res = 'g';
                   1418:                        (*pos)++;
                   1419:                        break;
1.207     schwarze 1420:                case '?':
1.204     schwarze 1421:                        *res = 'a';
                   1422:                        (*pos)++;
                   1423:                        break;
                   1424:                default:
                   1425:                        break;
                   1426:                }
                   1427:                break;
                   1428:        case '=':
                   1429:                if ('=' == v[*pos + 1])
                   1430:                        (*pos)++;
                   1431:                break;
                   1432:        default:
                   1433:                return(0);
                   1434:        }
                   1435:        (*pos)++;
                   1436:
                   1437:        return(*res);
                   1438: }
                   1439:
                   1440: /*
                   1441:  * Evaluate either a parenthesized numeric expression
                   1442:  * or a single signed integer number.
                   1443:  */
                   1444: static int
                   1445: roff_evalpar(const char *v, int *pos, int *res)
                   1446: {
                   1447:
                   1448:        if ('(' != v[*pos])
                   1449:                return(roff_getnum(v, pos, res));
                   1450:
                   1451:        (*pos)++;
                   1452:        if ( ! roff_evalnum(v, pos, res, 1))
                   1453:                return(0);
                   1454:
1.206     schwarze 1455:        /*
                   1456:         * Omission of the closing parenthesis
                   1457:         * is an error in validation mode,
                   1458:         * but ignored in evaluation mode.
                   1459:         */
                   1460:
1.204     schwarze 1461:        if (')' == v[*pos])
                   1462:                (*pos)++;
1.206     schwarze 1463:        else if (NULL == res)
                   1464:                return(0);
1.204     schwarze 1465:
                   1466:        return(1);
                   1467: }
                   1468:
                   1469: /*
                   1470:  * Evaluate a complete numeric expression.
                   1471:  * Proceed left to right, there is no concept of precedence.
                   1472:  */
                   1473: static int
                   1474: roff_evalnum(const char *v, int *pos, int *res, int skipwhite)
                   1475: {
                   1476:        int              mypos, operand2;
                   1477:        char             operator;
                   1478:
                   1479:        if (NULL == pos) {
                   1480:                mypos = 0;
                   1481:                pos = &mypos;
                   1482:        }
                   1483:
                   1484:        if (skipwhite)
                   1485:                while (isspace((unsigned char)v[*pos]))
                   1486:                        (*pos)++;
                   1487:
                   1488:        if ( ! roff_evalpar(v, pos, res))
                   1489:                return(0);
                   1490:
                   1491:        while (1) {
                   1492:                if (skipwhite)
                   1493:                        while (isspace((unsigned char)v[*pos]))
                   1494:                                (*pos)++;
                   1495:
                   1496:                if ( ! roff_getop(v, pos, &operator))
                   1497:                        break;
                   1498:
                   1499:                if (skipwhite)
                   1500:                        while (isspace((unsigned char)v[*pos]))
                   1501:                                (*pos)++;
                   1502:
                   1503:                if ( ! roff_evalpar(v, pos, &operand2))
                   1504:                        return(0);
                   1505:
                   1506:                if (skipwhite)
                   1507:                        while (isspace((unsigned char)v[*pos]))
                   1508:                                (*pos)++;
1.206     schwarze 1509:
                   1510:                if (NULL == res)
                   1511:                        continue;
1.204     schwarze 1512:
                   1513:                switch (operator) {
1.207     schwarze 1514:                case '+':
1.204     schwarze 1515:                        *res += operand2;
                   1516:                        break;
1.207     schwarze 1517:                case '-':
1.204     schwarze 1518:                        *res -= operand2;
                   1519:                        break;
1.207     schwarze 1520:                case '*':
1.204     schwarze 1521:                        *res *= operand2;
                   1522:                        break;
1.207     schwarze 1523:                case '/':
1.204     schwarze 1524:                        *res /= operand2;
                   1525:                        break;
1.207     schwarze 1526:                case '%':
1.204     schwarze 1527:                        *res %= operand2;
                   1528:                        break;
1.207     schwarze 1529:                case '<':
1.204     schwarze 1530:                        *res = *res < operand2;
                   1531:                        break;
1.207     schwarze 1532:                case '>':
1.204     schwarze 1533:                        *res = *res > operand2;
                   1534:                        break;
1.207     schwarze 1535:                case 'l':
1.204     schwarze 1536:                        *res = *res <= operand2;
                   1537:                        break;
1.207     schwarze 1538:                case 'g':
1.204     schwarze 1539:                        *res = *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 '&':
1.204     schwarze 1548:                        *res = *res && operand2;
                   1549:                        break;
1.207     schwarze 1550:                case ':':
1.204     schwarze 1551:                        *res = *res || operand2;
                   1552:                        break;
1.207     schwarze 1553:                case 'i':
1.204     schwarze 1554:                        if (operand2 < *res)
                   1555:                                *res = operand2;
                   1556:                        break;
1.207     schwarze 1557:                case 'a':
1.204     schwarze 1558:                        if (operand2 > *res)
                   1559:                                *res = operand2;
                   1560:                        break;
                   1561:                default:
                   1562:                        abort();
                   1563:                }
                   1564:        }
                   1565:        return(1);
                   1566: }
                   1567:
1.180     schwarze 1568: void
1.187     schwarze 1569: roff_setreg(struct roff *r, const char *name, int val, char sign)
1.147     kristaps 1570: {
1.180     schwarze 1571:        struct roffreg  *reg;
                   1572:
                   1573:        /* Search for an existing register with the same name. */
                   1574:        reg = r->regtab;
                   1575:
                   1576:        while (reg && strcmp(name, reg->key.p))
                   1577:                reg = reg->next;
1.147     kristaps 1578:
1.180     schwarze 1579:        if (NULL == reg) {
                   1580:                /* Create a new register. */
                   1581:                reg = mandoc_malloc(sizeof(struct roffreg));
                   1582:                reg->key.p = mandoc_strdup(name);
                   1583:                reg->key.sz = strlen(name);
1.187     schwarze 1584:                reg->val = 0;
1.180     schwarze 1585:                reg->next = r->regtab;
                   1586:                r->regtab = reg;
                   1587:        }
                   1588:
1.187     schwarze 1589:        if ('+' == sign)
                   1590:                reg->val += val;
                   1591:        else if ('-' == sign)
                   1592:                reg->val -= val;
                   1593:        else
                   1594:                reg->val = val;
1.147     kristaps 1595: }
                   1596:
1.192     schwarze 1597: /*
                   1598:  * Handle some predefined read-only number registers.
                   1599:  * For now, return -1 if the requested register is not predefined;
                   1600:  * in case a predefined read-only register having the value -1
                   1601:  * were to turn up, another special value would have to be chosen.
                   1602:  */
                   1603: static int
                   1604: roff_getregro(const char *name)
                   1605: {
                   1606:
                   1607:        switch (*name) {
1.207     schwarze 1608:        case 'A':  /* ASCII approximation mode is always off. */
1.192     schwarze 1609:                return(0);
1.207     schwarze 1610:        case 'g':  /* Groff compatibility mode is always on. */
1.192     schwarze 1611:                return(1);
1.207     schwarze 1612:        case 'H':  /* Fixed horizontal resolution. */
1.192     schwarze 1613:                return (24);
1.207     schwarze 1614:        case 'j':  /* Always adjust left margin only. */
1.192     schwarze 1615:                return(0);
1.207     schwarze 1616:        case 'T':  /* Some output device is always defined. */
1.192     schwarze 1617:                return(1);
1.207     schwarze 1618:        case 'V':  /* Fixed vertical resolution. */
1.192     schwarze 1619:                return (40);
                   1620:        default:
                   1621:                return (-1);
                   1622:        }
                   1623: }
                   1624:
1.181     schwarze 1625: int
1.180     schwarze 1626: roff_getreg(const struct roff *r, const char *name)
1.147     kristaps 1627: {
1.180     schwarze 1628:        struct roffreg  *reg;
1.192     schwarze 1629:        int              val;
                   1630:
                   1631:        if ('.' == name[0] && '\0' != name[1] && '\0' == name[2]) {
                   1632:                val = roff_getregro(name + 1);
                   1633:                if (-1 != val)
                   1634:                        return (val);
                   1635:        }
1.180     schwarze 1636:
                   1637:        for (reg = r->regtab; reg; reg = reg->next)
                   1638:                if (0 == strcmp(name, reg->key.p))
1.181     schwarze 1639:                        return(reg->val);
                   1640:
                   1641:        return(0);
                   1642: }
                   1643:
                   1644: static int
                   1645: roff_getregn(const struct roff *r, const char *name, size_t len)
                   1646: {
                   1647:        struct roffreg  *reg;
1.192     schwarze 1648:        int              val;
                   1649:
                   1650:        if ('.' == name[0] && 2 == len) {
                   1651:                val = roff_getregro(name + 1);
                   1652:                if (-1 != val)
                   1653:                        return (val);
                   1654:        }
1.181     schwarze 1655:
                   1656:        for (reg = r->regtab; reg; reg = reg->next)
                   1657:                if (len == reg->key.sz &&
                   1658:                    0 == strncmp(name, reg->key.p, len))
                   1659:                        return(reg->val);
1.147     kristaps 1660:
1.180     schwarze 1661:        return(0);
1.147     kristaps 1662: }
                   1663:
1.180     schwarze 1664: static void
                   1665: roff_freereg(struct roffreg *reg)
1.147     kristaps 1666: {
1.180     schwarze 1667:        struct roffreg  *old_reg;
1.147     kristaps 1668:
1.180     schwarze 1669:        while (NULL != reg) {
                   1670:                free(reg->key.p);
                   1671:                old_reg = reg;
                   1672:                reg = reg->next;
                   1673:                free(old_reg);
                   1674:        }
1.147     kristaps 1675: }
1.92      schwarze 1676:
                   1677: static enum rofferr
1.89      kristaps 1678: roff_nr(ROFF_ARGS)
1.83      schwarze 1679: {
1.212     schwarze 1680:        char            *key, *val;
                   1681:        size_t           keysz;
1.138     kristaps 1682:        int              iv;
1.187     schwarze 1683:        char             sign;
1.89      kristaps 1684:
1.212     schwarze 1685:        key = val = *bufp + pos;
                   1686:        if ('\0' == *key)
                   1687:                return(ROFF_IGN);
                   1688:
                   1689:        keysz = roff_getname(r, &val, ln, pos);
                   1690:        if ('\\' == key[keysz])
                   1691:                return(ROFF_IGN);
                   1692:        key[keysz] = '\0';
1.89      kristaps 1693:
1.187     schwarze 1694:        sign = *val;
                   1695:        if ('+' == sign || '-' == sign)
                   1696:                val++;
                   1697:
1.204     schwarze 1698:        if (roff_evalnum(val, NULL, &iv, 0))
                   1699:                roff_setreg(r, key, iv, sign);
1.109     kristaps 1700:
1.203     schwarze 1701:        return(ROFF_IGN);
                   1702: }
                   1703:
                   1704: static enum rofferr
                   1705: roff_rr(ROFF_ARGS)
                   1706: {
                   1707:        struct roffreg  *reg, **prev;
1.212     schwarze 1708:        char            *name, *cp;
                   1709:        size_t           namesz;
1.203     schwarze 1710:
1.212     schwarze 1711:        name = cp = *bufp + pos;
                   1712:        if ('\0' == *name)
                   1713:                return(ROFF_IGN);
                   1714:        namesz = roff_getname(r, &cp, ln, pos);
                   1715:        name[namesz] = '\0';
1.203     schwarze 1716:
                   1717:        prev = &r->regtab;
                   1718:        while (1) {
                   1719:                reg = *prev;
                   1720:                if (NULL == reg || !strcmp(name, reg->key.p))
                   1721:                        break;
                   1722:                prev = &reg->next;
                   1723:        }
                   1724:        if (NULL != reg) {
                   1725:                *prev = reg->next;
                   1726:                free(reg->key.p);
                   1727:                free(reg);
                   1728:        }
1.122     schwarze 1729:        return(ROFF_IGN);
                   1730: }
                   1731:
                   1732: static enum rofferr
                   1733: roff_rm(ROFF_ARGS)
                   1734: {
                   1735:        const char       *name;
                   1736:        char             *cp;
1.212     schwarze 1737:        size_t            namesz;
1.122     schwarze 1738:
                   1739:        cp = *bufp + pos;
                   1740:        while ('\0' != *cp) {
1.212     schwarze 1741:                name = cp;
                   1742:                namesz = roff_getname(r, &cp, ln, (int)(cp - *bufp));
                   1743:                roff_setstrn(&r->strtab, name, namesz, NULL, 0, 0);
                   1744:                if ('\\' == name[namesz])
                   1745:                        break;
1.122     schwarze 1746:        }
1.178     schwarze 1747:        return(ROFF_IGN);
                   1748: }
                   1749:
                   1750: static enum rofferr
                   1751: roff_it(ROFF_ARGS)
                   1752: {
                   1753:        char            *cp;
                   1754:        size_t           len;
                   1755:        int              iv;
                   1756:
                   1757:        /* Parse the number of lines. */
                   1758:        cp = *bufp + pos;
                   1759:        len = strcspn(cp, " \t");
                   1760:        cp[len] = '\0';
                   1761:        if ((iv = mandoc_strntoi(cp, len, 10)) <= 0) {
1.222     schwarze 1762:                mandoc_msg(MANDOCERR_IT_NONUM, r->parse,
1.207     schwarze 1763:                    ln, ppos, *bufp + 1);
1.178     schwarze 1764:                return(ROFF_IGN);
                   1765:        }
                   1766:        cp += len + 1;
                   1767:
                   1768:        /* Arm the input line trap. */
                   1769:        roffit_lines = iv;
                   1770:        roffit_macro = mandoc_strdup(cp);
1.109     kristaps 1771:        return(ROFF_IGN);
1.175     schwarze 1772: }
                   1773:
                   1774: static enum rofferr
                   1775: roff_Dd(ROFF_ARGS)
                   1776: {
                   1777:        const char *const       *cp;
                   1778:
1.199     schwarze 1779:        if (0 == ((MPARSE_MDOC | MPARSE_QUICK) & r->options))
1.175     schwarze 1780:                for (cp = __mdoc_reserved; *cp; cp++)
                   1781:                        roff_setstr(r, *cp, NULL, 0);
                   1782:
                   1783:        return(ROFF_CONT);
                   1784: }
                   1785:
                   1786: static enum rofferr
                   1787: roff_TH(ROFF_ARGS)
                   1788: {
                   1789:        const char *const       *cp;
                   1790:
1.199     schwarze 1791:        if (0 == (MPARSE_QUICK & r->options))
1.175     schwarze 1792:                for (cp = __man_reserved; *cp; cp++)
                   1793:                        roff_setstr(r, *cp, NULL, 0);
                   1794:
                   1795:        return(ROFF_CONT);
1.109     kristaps 1796: }
                   1797:
                   1798: static enum rofferr
                   1799: roff_TE(ROFF_ARGS)
                   1800: {
                   1801:
                   1802:        if (NULL == r->tbl)
1.221     schwarze 1803:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                   1804:                    ln, ppos, "TE");
1.115     kristaps 1805:        else
1.151     kristaps 1806:                tbl_end(&r->tbl);
1.109     kristaps 1807:
1.112     kristaps 1808:        return(ROFF_IGN);
                   1809: }
                   1810:
                   1811: static enum rofferr
                   1812: roff_T_(ROFF_ARGS)
                   1813: {
                   1814:
                   1815:        if (NULL == r->tbl)
1.221     schwarze 1816:                mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse,
                   1817:                    ln, ppos, "T&");
1.112     kristaps 1818:        else
1.116     kristaps 1819:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1820:
1.109     kristaps 1821:        return(ROFF_IGN);
                   1822: }
                   1823:
1.156     kristaps 1824: #if 0
                   1825: static int
1.151     kristaps 1826: roff_closeeqn(struct roff *r)
                   1827: {
                   1828:
                   1829:        return(r->eqn && ROFF_EQN == eqn_end(&r->eqn) ? 1 : 0);
                   1830: }
1.156     kristaps 1831: #endif
1.151     kristaps 1832:
1.156     kristaps 1833: static void
1.207     schwarze 1834: roff_openeqn(struct roff *r, const char *name, int line,
1.151     kristaps 1835:                int offs, const char *buf)
1.125     kristaps 1836: {
1.151     kristaps 1837:        struct eqn_node *e;
                   1838:        int              poff;
1.125     kristaps 1839:
                   1840:        assert(NULL == r->eqn);
1.151     kristaps 1841:        e = eqn_alloc(name, offs, line, r->parse);
1.125     kristaps 1842:
                   1843:        if (r->last_eqn)
                   1844:                r->last_eqn->next = e;
                   1845:        else
                   1846:                r->first_eqn = r->last_eqn = e;
                   1847:
                   1848:        r->eqn = r->last_eqn = e;
1.151     kristaps 1849:
                   1850:        if (buf) {
                   1851:                poff = 0;
                   1852:                eqn_read(&r->eqn, line, buf, offs, &poff);
                   1853:        }
                   1854: }
                   1855:
                   1856: static enum rofferr
                   1857: roff_EQ(ROFF_ARGS)
                   1858: {
                   1859:
                   1860:        roff_openeqn(r, *bufp + pos, ln, ppos, NULL);
1.125     kristaps 1861:        return(ROFF_IGN);
                   1862: }
                   1863:
                   1864: static enum rofferr
                   1865: roff_EN(ROFF_ARGS)
                   1866: {
                   1867:
1.221     schwarze 1868:        mandoc_msg(MANDOCERR_BLK_NOTOPEN, r->parse, ln, ppos, "EN");
1.125     kristaps 1869:        return(ROFF_IGN);
                   1870: }
                   1871:
                   1872: static enum rofferr
1.109     kristaps 1873: roff_TS(ROFF_ARGS)
                   1874: {
1.176     schwarze 1875:        struct tbl_node *tbl;
1.89      kristaps 1876:
1.115     kristaps 1877:        if (r->tbl) {
1.221     schwarze 1878:                mandoc_msg(MANDOCERR_BLK_BROKEN, r->parse,
                   1879:                    ln, ppos, "TS breaks TS");
1.151     kristaps 1880:                tbl_end(&r->tbl);
1.115     kristaps 1881:        }
1.83      schwarze 1882:
1.176     schwarze 1883:        tbl = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 1884:
                   1885:        if (r->last_tbl)
1.176     schwarze 1886:                r->last_tbl->next = tbl;
1.113     kristaps 1887:        else
1.176     schwarze 1888:                r->first_tbl = r->last_tbl = tbl;
1.113     kristaps 1889:
1.176     schwarze 1890:        r->tbl = r->last_tbl = tbl;
1.83      schwarze 1891:        return(ROFF_IGN);
1.92      schwarze 1892: }
                   1893:
1.105     kristaps 1894: static enum rofferr
1.174     kristaps 1895: roff_cc(ROFF_ARGS)
                   1896: {
                   1897:        const char      *p;
                   1898:
                   1899:        p = *bufp + pos;
                   1900:
                   1901:        if ('\0' == *p || '.' == (r->control = *p++))
                   1902:                r->control = 0;
                   1903:
                   1904:        if ('\0' != *p)
                   1905:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1906:
                   1907:        return(ROFF_IGN);
                   1908: }
                   1909:
                   1910: static enum rofferr
1.164     kristaps 1911: roff_tr(ROFF_ARGS)
                   1912: {
                   1913:        const char      *p, *first, *second;
                   1914:        size_t           fsz, ssz;
                   1915:        enum mandoc_esc  esc;
                   1916:
                   1917:        p = *bufp + pos;
                   1918:
                   1919:        if ('\0' == *p) {
                   1920:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1921:                return(ROFF_IGN);
                   1922:        }
                   1923:
                   1924:        while ('\0' != *p) {
                   1925:                fsz = ssz = 1;
                   1926:
                   1927:                first = p++;
                   1928:                if ('\\' == *first) {
                   1929:                        esc = mandoc_escape(&p, NULL, NULL);
                   1930:                        if (ESCAPE_ERROR == esc) {
1.219     schwarze 1931:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
                   1932:                                    ln, (int)(p - *bufp), first);
1.164     kristaps 1933:                                return(ROFF_IGN);
                   1934:                        }
                   1935:                        fsz = (size_t)(p - first);
                   1936:                }
                   1937:
                   1938:                second = p++;
                   1939:                if ('\\' == *second) {
                   1940:                        esc = mandoc_escape(&p, NULL, NULL);
                   1941:                        if (ESCAPE_ERROR == esc) {
1.219     schwarze 1942:                                mandoc_msg(MANDOCERR_ESC_BAD, r->parse,
                   1943:                                    ln, (int)(p - *bufp), second);
1.164     kristaps 1944:                                return(ROFF_IGN);
                   1945:                        }
                   1946:                        ssz = (size_t)(p - second);
1.165     kristaps 1947:                } else if ('\0' == *second) {
1.207     schwarze 1948:                        mandoc_msg(MANDOCERR_ARGCOUNT, r->parse,
                   1949:                            ln, (int)(p - *bufp), NULL);
1.164     kristaps 1950:                        second = " ";
1.165     kristaps 1951:                        p--;
1.164     kristaps 1952:                }
                   1953:
1.167     kristaps 1954:                if (fsz > 1) {
1.207     schwarze 1955:                        roff_setstrn(&r->xmbtab, first, fsz,
                   1956:                            second, ssz, 0);
1.167     kristaps 1957:                        continue;
                   1958:                }
                   1959:
                   1960:                if (NULL == r->xtab)
1.207     schwarze 1961:                        r->xtab = mandoc_calloc(128,
                   1962:                            sizeof(struct roffstr));
1.167     kristaps 1963:
                   1964:                free(r->xtab[(int)*first].p);
                   1965:                r->xtab[(int)*first].p = mandoc_strndup(second, ssz);
                   1966:                r->xtab[(int)*first].sz = ssz;
1.164     kristaps 1967:        }
                   1968:
                   1969:        return(ROFF_IGN);
                   1970: }
                   1971:
                   1972: static enum rofferr
1.105     kristaps 1973: roff_so(ROFF_ARGS)
                   1974: {
                   1975:        char *name;
                   1976:
1.210     schwarze 1977:        name = *bufp + pos;
                   1978:        mandoc_vmsg(MANDOCERR_SO, r->parse, ln, ppos, ".so %s", name);
1.105     kristaps 1979:
                   1980:        /*
                   1981:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   1982:         * opening anything that's not in our cwd or anything beneath
                   1983:         * it.  Thus, explicitly disallow traversing up the file-system
                   1984:         * or using absolute paths.
                   1985:         */
                   1986:
                   1987:        if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
1.210     schwarze 1988:                mandoc_vmsg(MANDOCERR_SO_PATH, r->parse, ln, ppos,
                   1989:                    ".so %s", name);
1.105     kristaps 1990:                return(ROFF_ERR);
                   1991:        }
                   1992:
                   1993:        *offs = pos;
                   1994:        return(ROFF_SO);
                   1995: }
1.92      schwarze 1996:
1.106     kristaps 1997: static enum rofferr
                   1998: roff_userdef(ROFF_ARGS)
1.99      kristaps 1999: {
1.106     kristaps 2000:        const char       *arg[9];
                   2001:        char             *cp, *n1, *n2;
1.119     schwarze 2002:        int               i;
1.106     kristaps 2003:
                   2004:        /*
                   2005:         * Collect pointers to macro argument strings
1.188     schwarze 2006:         * and NUL-terminate them.
1.106     kristaps 2007:         */
                   2008:        cp = *bufp + pos;
1.119     schwarze 2009:        for (i = 0; i < 9; i++)
1.120     schwarze 2010:                arg[i] = '\0' == *cp ? "" :
1.136     kristaps 2011:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 2012:
1.106     kristaps 2013:        /*
                   2014:         * Expand macro arguments.
1.99      kristaps 2015:         */
1.106     kristaps 2016:        *szp = 0;
                   2017:        n1 = cp = mandoc_strdup(r->current_string);
                   2018:        while (NULL != (cp = strstr(cp, "\\$"))) {
                   2019:                i = cp[2] - '1';
                   2020:                if (0 > i || 8 < i) {
                   2021:                        /* Not an argument invocation. */
                   2022:                        cp += 2;
                   2023:                        continue;
                   2024:                }
1.209     schwarze 2025:                *cp = '\0';
                   2026:                *szp = mandoc_asprintf(&n2, "%s%s%s",
                   2027:                    n1, arg[i], cp + 3) + 1;
1.106     kristaps 2028:                cp = n2 + (cp - n1);
                   2029:                free(n1);
                   2030:                n1 = n2;
1.99      kristaps 2031:        }
                   2032:
1.106     kristaps 2033:        /*
                   2034:         * Replace the macro invocation
                   2035:         * by the expanded macro.
                   2036:         */
                   2037:        free(*bufp);
                   2038:        *bufp = n1;
                   2039:        if (0 == *szp)
                   2040:                *szp = strlen(*bufp) + 1;
                   2041:
                   2042:        return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
                   2043:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 2044: }
1.121     schwarze 2045:
1.212     schwarze 2046: static size_t
1.121     schwarze 2047: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   2048: {
                   2049:        char     *name, *cp;
1.212     schwarze 2050:        size_t    namesz;
1.121     schwarze 2051:
                   2052:        name = *cpp;
                   2053:        if ('\0' == *name)
1.212     schwarze 2054:                return(0);
1.121     schwarze 2055:
1.212     schwarze 2056:        /* Read until end of name and terminate it with NUL. */
                   2057:        for (cp = name; 1; cp++) {
                   2058:                if ('\0' == *cp || ' ' == *cp) {
                   2059:                        namesz = cp - name;
                   2060:                        break;
                   2061:                }
1.121     schwarze 2062:                if ('\\' != *cp)
                   2063:                        continue;
1.215     schwarze 2064:                namesz = cp - name;
                   2065:                if ('{' == cp[1] || '}' == cp[1])
                   2066:                        break;
1.121     schwarze 2067:                cp++;
                   2068:                if ('\\' == *cp)
                   2069:                        continue;
1.128     kristaps 2070:                mandoc_msg(MANDOCERR_NAMESC, r->parse, ln, pos, NULL);
1.212     schwarze 2071:                mandoc_escape((const char **)&cp, NULL, NULL);
                   2072:                break;
1.121     schwarze 2073:        }
                   2074:
                   2075:        /* Read past spaces. */
                   2076:        while (' ' == *cp)
                   2077:                cp++;
                   2078:
                   2079:        *cpp = cp;
1.212     schwarze 2080:        return(namesz);
1.121     schwarze 2081: }
                   2082:
1.106     kristaps 2083: /*
                   2084:  * Store *string into the user-defined string called *name.
                   2085:  * To clear an existing entry, call with (*r, *name, NULL, 0).
1.193     schwarze 2086:  * append == 0: replace mode
                   2087:  * append == 1: single-line append mode
                   2088:  * append == 2: multiline append mode, append '\n' after each call
1.106     kristaps 2089:  */
1.94      kristaps 2090: static void
1.106     kristaps 2091: roff_setstr(struct roff *r, const char *name, const char *string,
1.193     schwarze 2092:        int append)
1.92      schwarze 2093: {
1.164     kristaps 2094:
                   2095:        roff_setstrn(&r->strtab, name, strlen(name), string,
1.207     schwarze 2096:            string ? strlen(string) : 0, append);
1.164     kristaps 2097: }
                   2098:
                   2099: static void
1.166     kristaps 2100: roff_setstrn(struct roffkv **r, const char *name, size_t namesz,
1.193     schwarze 2101:                const char *string, size_t stringsz, int append)
1.164     kristaps 2102: {
1.166     kristaps 2103:        struct roffkv   *n;
1.164     kristaps 2104:        char            *c;
                   2105:        int              i;
                   2106:        size_t           oldch, newch;
1.92      schwarze 2107:
1.106     kristaps 2108:        /* Search for an existing string with the same name. */
1.164     kristaps 2109:        n = *r;
                   2110:
1.211     schwarze 2111:        while (n && (namesz != n->key.sz ||
                   2112:                        strncmp(n->key.p, name, namesz)))
1.92      schwarze 2113:                n = n->next;
1.94      kristaps 2114:
                   2115:        if (NULL == n) {
1.106     kristaps 2116:                /* Create a new string table entry. */
1.166     kristaps 2117:                n = mandoc_malloc(sizeof(struct roffkv));
                   2118:                n->key.p = mandoc_strndup(name, namesz);
                   2119:                n->key.sz = namesz;
                   2120:                n->val.p = NULL;
                   2121:                n->val.sz = 0;
1.164     kristaps 2122:                n->next = *r;
                   2123:                *r = n;
1.193     schwarze 2124:        } else if (0 == append) {
1.166     kristaps 2125:                free(n->val.p);
                   2126:                n->val.p = NULL;
                   2127:                n->val.sz = 0;
1.106     kristaps 2128:        }
                   2129:
                   2130:        if (NULL == string)
                   2131:                return;
                   2132:
                   2133:        /*
                   2134:         * One additional byte for the '\n' in multiline mode,
                   2135:         * and one for the terminating '\0'.
                   2136:         */
1.193     schwarze 2137:        newch = stringsz + (1 < append ? 2u : 1u);
1.164     kristaps 2138:
1.166     kristaps 2139:        if (NULL == n->val.p) {
                   2140:                n->val.p = mandoc_malloc(newch);
                   2141:                *n->val.p = '\0';
1.106     kristaps 2142:                oldch = 0;
                   2143:        } else {
1.166     kristaps 2144:                oldch = n->val.sz;
                   2145:                n->val.p = mandoc_realloc(n->val.p, oldch + newch);
1.106     kristaps 2146:        }
                   2147:
                   2148:        /* Skip existing content in the destination buffer. */
1.166     kristaps 2149:        c = n->val.p + (int)oldch;
1.106     kristaps 2150:
                   2151:        /* Append new content to the destination buffer. */
1.164     kristaps 2152:        i = 0;
                   2153:        while (i < (int)stringsz) {
1.106     kristaps 2154:                /*
                   2155:                 * Rudimentary roff copy mode:
                   2156:                 * Handle escaped backslashes.
                   2157:                 */
1.164     kristaps 2158:                if ('\\' == string[i] && '\\' == string[i + 1])
                   2159:                        i++;
                   2160:                *c++ = string[i++];
1.106     kristaps 2161:        }
1.94      kristaps 2162:
1.106     kristaps 2163:        /* Append terminating bytes. */
1.193     schwarze 2164:        if (1 < append)
1.106     kristaps 2165:                *c++ = '\n';
1.163     kristaps 2166:
1.106     kristaps 2167:        *c = '\0';
1.166     kristaps 2168:        n->val.sz = (int)(c - n->val.p);
1.92      schwarze 2169: }
                   2170:
1.94      kristaps 2171: static const char *
                   2172: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 2173: {
1.166     kristaps 2174:        const struct roffkv *n;
1.191     schwarze 2175:        int i;
1.92      schwarze 2176:
1.164     kristaps 2177:        for (n = r->strtab; n; n = n->next)
1.207     schwarze 2178:                if (0 == strncmp(name, n->key.p, len) &&
                   2179:                    '\0' == n->key.p[(int)len])
1.166     kristaps 2180:                        return(n->val.p);
1.191     schwarze 2181:
                   2182:        for (i = 0; i < PREDEFS_MAX; i++)
                   2183:                if (0 == strncmp(name, predefs[i].name, len) &&
                   2184:                                '\0' == predefs[i].name[(int)len])
                   2185:                        return(predefs[i].str);
1.94      kristaps 2186:
1.157     kristaps 2187:        return(NULL);
1.92      schwarze 2188: }
                   2189:
1.94      kristaps 2190: static void
1.167     kristaps 2191: roff_freestr(struct roffkv *r)
1.92      schwarze 2192: {
1.166     kristaps 2193:        struct roffkv    *n, *nn;
1.92      schwarze 2194:
1.167     kristaps 2195:        for (n = r; n; n = nn) {
1.166     kristaps 2196:                free(n->key.p);
                   2197:                free(n->val.p);
1.92      schwarze 2198:                nn = n->next;
                   2199:                free(n);
                   2200:        }
1.114     kristaps 2201: }
                   2202:
                   2203: const struct tbl_span *
                   2204: roff_span(const struct roff *r)
                   2205: {
1.207     schwarze 2206:
1.114     kristaps 2207:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 2208: }
                   2209:
                   2210: const struct eqn *
                   2211: roff_eqn(const struct roff *r)
                   2212: {
1.207     schwarze 2213:
1.125     kristaps 2214:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.164     kristaps 2215: }
                   2216:
                   2217: /*
                   2218:  * Duplicate an input string, making the appropriate character
                   2219:  * conversations (as stipulated by `tr') along the way.
                   2220:  * Returns a heap-allocated string with all the replacements made.
                   2221:  */
                   2222: char *
                   2223: roff_strdup(const struct roff *r, const char *p)
                   2224: {
1.166     kristaps 2225:        const struct roffkv *cp;
1.164     kristaps 2226:        char            *res;
                   2227:        const char      *pp;
                   2228:        size_t           ssz, sz;
                   2229:        enum mandoc_esc  esc;
                   2230:
1.167     kristaps 2231:        if (NULL == r->xmbtab && NULL == r->xtab)
1.164     kristaps 2232:                return(mandoc_strdup(p));
                   2233:        else if ('\0' == *p)
                   2234:                return(mandoc_strdup(""));
                   2235:
                   2236:        /*
                   2237:         * Step through each character looking for term matches
                   2238:         * (remember that a `tr' can be invoked with an escape, which is
                   2239:         * a glyph but the escape is multi-character).
                   2240:         * We only do this if the character hash has been initialised
                   2241:         * and the string is >0 length.
                   2242:         */
                   2243:
                   2244:        res = NULL;
                   2245:        ssz = 0;
                   2246:
                   2247:        while ('\0' != *p) {
1.167     kristaps 2248:                if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) {
                   2249:                        sz = r->xtab[(int)*p].sz;
                   2250:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2251:                        memcpy(res + ssz, r->xtab[(int)*p].p, sz);
                   2252:                        ssz += sz;
                   2253:                        p++;
                   2254:                        continue;
                   2255:                } else if ('\\' != *p) {
                   2256:                        res = mandoc_realloc(res, ssz + 2);
                   2257:                        res[ssz++] = *p++;
                   2258:                        continue;
                   2259:                }
                   2260:
1.164     kristaps 2261:                /* Search for term matches. */
1.167     kristaps 2262:                for (cp = r->xmbtab; cp; cp = cp->next)
1.166     kristaps 2263:                        if (0 == strncmp(p, cp->key.p, cp->key.sz))
1.164     kristaps 2264:                                break;
                   2265:
                   2266:                if (NULL != cp) {
                   2267:                        /*
                   2268:                         * A match has been found.
                   2269:                         * Append the match to the array and move
                   2270:                         * forward by its keysize.
                   2271:                         */
1.207     schwarze 2272:                        res = mandoc_realloc(res,
                   2273:                            ssz + cp->val.sz + 1);
1.166     kristaps 2274:                        memcpy(res + ssz, cp->val.p, cp->val.sz);
                   2275:                        ssz += cp->val.sz;
                   2276:                        p += (int)cp->key.sz;
1.164     kristaps 2277:                        continue;
                   2278:                }
                   2279:
1.167     kristaps 2280:                /*
                   2281:                 * Handle escapes carefully: we need to copy
                   2282:                 * over just the escape itself, or else we might
                   2283:                 * do replacements within the escape itself.
                   2284:                 * Make sure to pass along the bogus string.
                   2285:                 */
                   2286:                pp = p++;
                   2287:                esc = mandoc_escape(&p, NULL, NULL);
                   2288:                if (ESCAPE_ERROR == esc) {
                   2289:                        sz = strlen(pp);
1.164     kristaps 2290:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2291:                        memcpy(res + ssz, pp, sz);
1.167     kristaps 2292:                        break;
1.164     kristaps 2293:                }
1.207     schwarze 2294:                /*
                   2295:                 * We bail out on bad escapes.
1.167     kristaps 2296:                 * No need to warn: we already did so when
                   2297:                 * roff_res() was called.
                   2298:                 */
                   2299:                sz = (int)(p - pp);
                   2300:                res = mandoc_realloc(res, ssz + sz + 1);
                   2301:                memcpy(res + ssz, pp, sz);
                   2302:                ssz += sz;
1.164     kristaps 2303:        }
                   2304:
                   2305:        res[(int)ssz] = '\0';
                   2306:        return(res);
1.174     kristaps 2307: }
                   2308:
                   2309: /*
1.207     schwarze 2310:  * Find out whether a line is a macro line or not.
1.174     kristaps 2311:  * If it is, adjust the current position and return one; if it isn't,
                   2312:  * return zero and don't change the current position.
                   2313:  * If the control character has been set with `.cc', then let that grain
                   2314:  * precedence.
                   2315:  * This is slighly contrary to groff, where using the non-breaking
                   2316:  * control character when `cc' has been invoked will cause the
                   2317:  * non-breaking macro contents to be printed verbatim.
                   2318:  */
                   2319: int
                   2320: roff_getcontrol(const struct roff *r, const char *cp, int *ppos)
                   2321: {
                   2322:        int             pos;
                   2323:
                   2324:        pos = *ppos;
                   2325:
                   2326:        if (0 != r->control && cp[pos] == r->control)
                   2327:                pos++;
                   2328:        else if (0 != r->control)
                   2329:                return(0);
                   2330:        else if ('\\' == cp[pos] && '.' == cp[pos + 1])
                   2331:                pos += 2;
                   2332:        else if ('.' == cp[pos] || '\'' == cp[pos])
                   2333:                pos++;
                   2334:        else
                   2335:                return(0);
                   2336:
                   2337:        while (' ' == cp[pos] || '\t' == cp[pos])
                   2338:                pos++;
                   2339:
                   2340:        *ppos = pos;
                   2341:        return(1);
1.74      kristaps 2342: }

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