[BACK]Return to roff.c CVS log [TXT][DIR] Up to [cvsweb.bsd.lv] / mandoc

Annotation of mandoc/roff.c, Revision 1.204

1.204   ! schwarze    1: /*     $Id: roff.c,v 1.203 2014/04/05 20:34:57 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 */
1.199     schwarze  109:        int              options; /* parse options */
1.67      kristaps  110:        struct roffnode *last; /* leaf of stack */
1.198     schwarze  111:        int              rstack[RSTACK_MAX]; /* stack of !`ie' rules */
1.174     kristaps  112:        char             control; /* control character */
1.82      kristaps  113:        int              rstackpos; /* position in rstack */
1.180     schwarze  114:        struct roffreg  *regtab; /* number registers */
1.166     kristaps  115:        struct roffkv   *strtab; /* user-defined strings & macros */
1.167     kristaps  116:        struct roffkv   *xmbtab; /* multi-byte trans table (`tr') */
                    117:        struct roffstr  *xtab; /* single-byte trans table (`tr') */
1.106     kristaps  118:        const char      *current_string; /* value of last called user macro */
1.118     kristaps  119:        struct tbl_node *first_tbl; /* first table parsed */
                    120:        struct tbl_node *last_tbl; /* last table parsed */
                    121:        struct tbl_node *tbl; /* current table being parsed */
1.125     kristaps  122:        struct eqn_node *last_eqn; /* last equation parsed */
                    123:        struct eqn_node *first_eqn; /* first equation parsed */
                    124:        struct eqn_node *eqn; /* current equation being parsed */
1.79      kristaps  125: };
                    126:
1.67      kristaps  127: struct roffnode {
                    128:        enum rofft       tok; /* type of node */
                    129:        struct roffnode *parent; /* up one in stack */
                    130:        int              line; /* parse line */
                    131:        int              col; /* parse col */
1.106     kristaps  132:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  133:        char            *end; /* end-rules: custom token */
                    134:        int              endspan; /* end-rules: next-line or infty */
1.198     schwarze  135:        int              rule; /* current evaluation rule */
1.67      kristaps  136: };
                    137:
                    138: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  139:                         enum rofft tok, /* tok of macro */ \
1.67      kristaps  140:                         char **bufp, /* input buffer */ \
                    141:                         size_t *szp, /* size of input buffer */ \
                    142:                         int ln, /* parse line */ \
1.75      kristaps  143:                         int ppos, /* original pos in buffer */ \
                    144:                         int pos, /* current pos in buffer */ \
1.74      kristaps  145:                         int *offs /* reset offset of buffer data */
1.67      kristaps  146:
                    147: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    148:
                    149: struct roffmac {
                    150:        const char      *name; /* macro name */
1.79      kristaps  151:        roffproc         proc; /* process new macro */
                    152:        roffproc         text; /* process as child text of macro */
                    153:        roffproc         sub; /* process as child of macro */
                    154:        int              flags;
                    155: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  156:        struct roffmac  *next;
1.67      kristaps  157: };
                    158:
1.141     kristaps  159: struct predef {
                    160:        const char      *name; /* predefined input name */
                    161:        const char      *str; /* replacement symbol */
                    162: };
                    163:
                    164: #define        PREDEF(__name, __str) \
                    165:        { (__name), (__str) },
                    166:
1.155     kristaps  167: static enum rofft       roffhash_find(const char *, size_t);
                    168: static void             roffhash_init(void);
                    169: static void             roffnode_cleanscope(struct roff *);
                    170: static void             roffnode_pop(struct roff *);
                    171: static void             roffnode_push(struct roff *, enum rofft,
                    172:                                const char *, int, int);
1.80      kristaps  173: static enum rofferr     roff_block(ROFF_ARGS);
                    174: static enum rofferr     roff_block_text(ROFF_ARGS);
                    175: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    176: static enum rofferr     roff_cblock(ROFF_ARGS);
1.174     kristaps  177: static enum rofferr     roff_cc(ROFF_ARGS);
1.195     schwarze  178: static void             roff_ccond(struct roff *, int, int);
1.82      kristaps  179: static enum rofferr     roff_cond(ROFF_ARGS);
                    180: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    181: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  182: static enum rofferr     roff_ds(ROFF_ARGS);
1.198     schwarze  183: static int              roff_evalcond(const char *, int *);
1.204   ! schwarze  184: static int              roff_evalnum(const char *, int *, int *, int);
        !           185: static int              roff_evalpar(const char *, int *, int *);
1.198     schwarze  186: static int              roff_evalstrcond(const char *, int *);
1.155     kristaps  187: static void             roff_free1(struct roff *);
1.180     schwarze  188: static void             roff_freereg(struct roffreg *);
1.167     kristaps  189: static void             roff_freestr(struct roffkv *);
1.121     schwarze  190: static char            *roff_getname(struct roff *, char **, int, int);
1.184     schwarze  191: static int              roff_getnum(const char *, int *, int *);
                    192: static int              roff_getop(const char *, int *, char *);
1.181     schwarze  193: static int              roff_getregn(const struct roff *,
                    194:                                const char *, size_t);
1.192     schwarze  195: static int              roff_getregro(const char *name);
1.94      kristaps  196: static const char      *roff_getstrn(const struct roff *,
                    197:                                const char *, size_t);
1.178     schwarze  198: static enum rofferr     roff_it(ROFF_ARGS);
1.103     kristaps  199: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  200: static enum rofferr     roff_nr(ROFF_ARGS);
1.169     schwarze  201: static void             roff_openeqn(struct roff *, const char *,
1.156     kristaps  202:                                int, int, const char *);
1.155     kristaps  203: static enum rofft       roff_parse(struct roff *, const char *, int *);
1.178     schwarze  204: static enum rofferr     roff_parsetext(char **, size_t *, int, int *);
1.172     schwarze  205: static enum rofferr     roff_res(struct roff *,
1.142     kristaps  206:                                char **, size_t *, int, int);
1.122     schwarze  207: static enum rofferr     roff_rm(ROFF_ARGS);
1.203     schwarze  208: static enum rofferr     roff_rr(ROFF_ARGS);
1.94      kristaps  209: static void             roff_setstr(struct roff *,
1.106     kristaps  210:                                const char *, const char *, int);
1.166     kristaps  211: static void             roff_setstrn(struct roffkv **, const char *,
1.164     kristaps  212:                                size_t, const char *, size_t, int);
1.105     kristaps  213: static enum rofferr     roff_so(ROFF_ARGS);
1.164     kristaps  214: static enum rofferr     roff_tr(ROFF_ARGS);
1.175     schwarze  215: static enum rofferr     roff_Dd(ROFF_ARGS);
                    216: static enum rofferr     roff_TH(ROFF_ARGS);
1.109     kristaps  217: static enum rofferr     roff_TE(ROFF_ARGS);
                    218: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  219: static enum rofferr     roff_EQ(ROFF_ARGS);
                    220: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  221: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  222: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  223:
1.155     kristaps  224: /* See roffhash_find() */
1.85      kristaps  225:
                    226: #define        ASCII_HI         126
                    227: #define        ASCII_LO         33
                    228: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    229:
                    230: static struct roffmac  *hash[HASHWIDTH];
                    231:
                    232: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  233:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  234:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    235:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    236:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.193     schwarze  237:        { "as", roff_ds, NULL, NULL, 0, NULL },
1.174     kristaps  238:        { "cc", roff_cc, NULL, NULL, 0, NULL },
1.194     schwarze  239:        { "ce", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  240:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    241:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    242:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  243:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  244:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.185     schwarze  245:        { "fam", roff_line_ignore, NULL, NULL, 0, NULL },
1.186     schwarze  246:        { "hw", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  247:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  248:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    249:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    250:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.178     schwarze  251:        { "it", roff_it, NULL, NULL, 0, NULL },
1.103     kristaps  252:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    253:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  254:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  255:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
                    256:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  257:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.203     schwarze  258:        { "rr", roff_rr, NULL, NULL, 0, NULL },
1.105     kristaps  259:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  260:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.164     kristaps  261:        { "tr", roff_tr, NULL, NULL, 0, NULL },
1.175     schwarze  262:        { "Dd", roff_Dd, NULL, NULL, 0, NULL },
                    263:        { "TH", roff_TH, NULL, NULL, 0, NULL },
1.109     kristaps  264:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    265:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  266:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  267:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    268:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.85      kristaps  269:        { ".", roff_cblock, NULL, NULL, 0, NULL },
1.106     kristaps  270:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  271: };
                    272:
1.200     schwarze  273: /* not currently implemented: Ds em Eq LP Me PP pp Or Rd Sf SH */
1.175     schwarze  274: const  char *const __mdoc_reserved[] = {
                    275:        "Ac", "Ad", "An", "Ao", "Ap", "Aq", "Ar", "At",
                    276:        "Bc", "Bd", "Bf", "Bk", "Bl", "Bo", "Bq",
                    277:        "Brc", "Bro", "Brq", "Bsx", "Bt", "Bx",
                    278:        "Cd", "Cm", "Db", "Dc", "Dd", "Dl", "Do", "Dq",
1.200     schwarze  279:        "Dt", "Dv", "Dx", "D1",
                    280:        "Ec", "Ed", "Ef", "Ek", "El", "Em",
                    281:        "En", "Eo", "Er", "Es", "Ev", "Ex",
1.175     schwarze  282:        "Fa", "Fc", "Fd", "Fl", "Fn", "Fo", "Fr", "Ft", "Fx",
1.200     schwarze  283:        "Hf", "Ic", "In", "It", "Lb", "Li", "Lk", "Lp",
                    284:        "Ms", "Mt", "Nd", "Nm", "No", "Ns", "Nx",
1.175     schwarze  285:        "Oc", "Oo", "Op", "Os", "Ot", "Ox",
1.200     schwarze  286:        "Pa", "Pc", "Pf", "Po", "Pp", "Pq",
                    287:        "Qc", "Ql", "Qo", "Qq", "Re", "Rs", "Rv",
                    288:        "Sc", "Sh", "Sm", "So", "Sq",
1.175     schwarze  289:        "Ss", "St", "Sx", "Sy",
                    290:        "Ta", "Tn", "Ud", "Ux", "Va", "Vt", "Xc", "Xo", "Xr",
1.200     schwarze  291:        "%A", "%B", "%C", "%D", "%I", "%J", "%N", "%O",
1.175     schwarze  292:        "%P", "%Q", "%R", "%T", "%U", "%V",
                    293:        NULL
                    294: };
                    295:
1.200     schwarze  296: /* not currently implemented: BT DE DS ME MT PT SY TQ YS */
1.175     schwarze  297: const  char *const __man_reserved[] = {
1.200     schwarze  298:        "AT", "B", "BI", "BR", "DT",
                    299:        "EE", "EN", "EQ", "EX", "HP", "I", "IB", "IP", "IR",
                    300:        "LP", "OP", "P", "PD", "PP",
                    301:        "R", "RB", "RE", "RI", "RS", "SB", "SH", "SM", "SS",
                    302:        "TE", "TH", "TP", "TS", "T&", "UC", "UE", "UR",
1.175     schwarze  303:        NULL
                    304: };
                    305:
1.141     kristaps  306: /* Array of injected predefined strings. */
                    307: #define        PREDEFS_MAX      38
                    308: static const struct predef predefs[PREDEFS_MAX] = {
                    309: #include "predefs.in"
                    310: };
                    311:
1.155     kristaps  312: /* See roffhash_find() */
1.85      kristaps  313: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    314:
1.178     schwarze  315: static int      roffit_lines;  /* number of lines to delay */
                    316: static char    *roffit_macro;  /* nil-terminated macro line */
                    317:
1.85      kristaps  318: static void
1.155     kristaps  319: roffhash_init(void)
1.85      kristaps  320: {
                    321:        struct roffmac   *n;
                    322:        int               buc, i;
                    323:
1.106     kristaps  324:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  325:                assert(roffs[i].name[0] >= ASCII_LO);
                    326:                assert(roffs[i].name[0] <= ASCII_HI);
                    327:
                    328:                buc = ROFF_HASH(roffs[i].name);
                    329:
                    330:                if (NULL != (n = hash[buc])) {
                    331:                        for ( ; n->next; n = n->next)
                    332:                                /* Do nothing. */ ;
                    333:                        n->next = &roffs[i];
                    334:                } else
                    335:                        hash[buc] = &roffs[i];
                    336:        }
                    337: }
                    338:
1.67      kristaps  339: /*
                    340:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    341:  * the nil-terminated string name could be found.
                    342:  */
                    343: static enum rofft
1.155     kristaps  344: roffhash_find(const char *p, size_t s)
1.67      kristaps  345: {
1.85      kristaps  346:        int              buc;
                    347:        struct roffmac  *n;
1.67      kristaps  348:
1.85      kristaps  349:        /*
                    350:         * libroff has an extremely simple hashtable, for the time
                    351:         * being, which simply keys on the first character, which must
                    352:         * be printable, then walks a chain.  It works well enough until
                    353:         * optimised.
                    354:         */
                    355:
                    356:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    357:                return(ROFF_MAX);
                    358:
                    359:        buc = ROFF_HASH(p);
                    360:
                    361:        if (NULL == (n = hash[buc]))
                    362:                return(ROFF_MAX);
                    363:        for ( ; n; n = n->next)
1.106     kristaps  364:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  365:                        return((enum rofft)(n - roffs));
1.67      kristaps  366:
                    367:        return(ROFF_MAX);
                    368: }
                    369:
                    370:
                    371: /*
                    372:  * Pop the current node off of the stack of roff instructions currently
                    373:  * pending.
                    374:  */
                    375: static void
                    376: roffnode_pop(struct roff *r)
                    377: {
                    378:        struct roffnode *p;
                    379:
1.75      kristaps  380:        assert(r->last);
                    381:        p = r->last;
1.82      kristaps  382:
1.75      kristaps  383:        r->last = r->last->parent;
1.106     kristaps  384:        free(p->name);
                    385:        free(p->end);
1.67      kristaps  386:        free(p);
                    387: }
                    388:
                    389:
                    390: /*
                    391:  * Push a roff node onto the instruction stack.  This must later be
                    392:  * removed with roffnode_pop().
                    393:  */
1.98      schwarze  394: static void
1.106     kristaps  395: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    396:                int line, int col)
1.67      kristaps  397: {
                    398:        struct roffnode *p;
                    399:
1.98      schwarze  400:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  401:        p->tok = tok;
1.106     kristaps  402:        if (name)
                    403:                p->name = mandoc_strdup(name);
1.67      kristaps  404:        p->parent = r->last;
                    405:        p->line = line;
                    406:        p->col = col;
1.198     schwarze  407:        p->rule = p->parent ? p->parent->rule : 0;
1.67      kristaps  408:
                    409:        r->last = p;
                    410: }
                    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:        }
                    424:
1.113     kristaps  425:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    426:
1.125     kristaps  427:        while (NULL != (e = r->first_eqn)) {
                    428:                r->first_eqn = e->next;
                    429:                eqn_free(e);
                    430:        }
                    431:
                    432:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    433:
1.67      kristaps  434:        while (r->last)
                    435:                roffnode_pop(r);
1.109     kristaps  436:
1.167     kristaps  437:        roff_freestr(r->strtab);
                    438:        roff_freestr(r->xmbtab);
                    439:
                    440:        r->strtab = r->xmbtab = NULL;
                    441:
1.180     schwarze  442:        roff_freereg(r->regtab);
                    443:
                    444:        r->regtab = NULL;
                    445:
1.167     kristaps  446:        if (r->xtab)
                    447:                for (i = 0; i < 128; i++)
                    448:                        free(r->xtab[i].p);
                    449:
                    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:
                    463: void
                    464: roff_free(struct roff *r)
                    465: {
                    466:
                    467:        roff_free1(r);
                    468:        free(r);
                    469: }
                    470:
                    471:
                    472: struct roff *
1.199     schwarze  473: roff_alloc(struct mparse *parse, int options)
1.67      kristaps  474: {
                    475:        struct roff     *r;
                    476:
1.98      schwarze  477:        r = mandoc_calloc(1, sizeof(struct roff));
1.128     kristaps  478:        r->parse = parse;
1.199     schwarze  479:        r->options = options;
1.82      kristaps  480:        r->rstackpos = -1;
1.85      kristaps  481:
1.155     kristaps  482:        roffhash_init();
1.141     kristaps  483:
1.67      kristaps  484:        return(r);
                    485: }
                    486:
1.94      kristaps  487: /*
1.181     schwarze  488:  * In the current line, expand user-defined strings ("\*")
                    489:  * and references to number registers ("\n").
                    490:  * Also check the syntax of other escape sequences.
1.154     kristaps  491:  */
1.172     schwarze  492: static enum rofferr
1.142     kristaps  493: roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos)
1.94      kristaps  494: {
1.181     schwarze  495:        char             ubuf[12]; /* buffer to print the number */
1.108     schwarze  496:        const char      *stesc; /* start of an escape sequence ('\\') */
                    497:        const char      *stnam; /* start of the name, after "[(*" */
                    498:        const char      *cp;    /* end of the name, e.g. before ']' */
                    499:        const char      *res;   /* the string to be substituted */
1.181     schwarze  500:        char            *nbuf;  /* new buffer to copy bufp to */
                    501:        size_t           nsz;   /* size of the new buffer */
                    502:        size_t           maxl;  /* expected length of the escape name */
                    503:        size_t           naml;  /* actual length of the escape name */
                    504:        int              expand_count;  /* to avoid infinite loops */
1.94      kristaps  505:
1.170     schwarze  506:        expand_count = 0;
                    507:
1.154     kristaps  508: again:
1.108     schwarze  509:        cp = *bufp + pos;
                    510:        while (NULL != (cp = strchr(cp, '\\'))) {
                    511:                stesc = cp++;
                    512:
                    513:                /*
1.181     schwarze  514:                 * The second character must be an asterisk or an n.
1.108     schwarze  515:                 * If it isn't, skip it anyway:  It is escaped,
                    516:                 * so it can't start another escape sequence.
                    517:                 */
                    518:
                    519:                if ('\0' == *cp)
1.172     schwarze  520:                        return(ROFF_CONT);
1.152     kristaps  521:
1.181     schwarze  522:                switch (*cp) {
                    523:                case ('*'):
                    524:                        res = NULL;
                    525:                        break;
                    526:                case ('n'):
                    527:                        res = ubuf;
                    528:                        break;
                    529:                default:
                    530:                        if (ESCAPE_ERROR != mandoc_escape(&cp, NULL, NULL))
1.152     kristaps  531:                                continue;
1.153     kristaps  532:                        mandoc_msg
                    533:                                (MANDOCERR_BADESCAPE, r->parse,
                    534:                                 ln, (int)(stesc - *bufp), NULL);
1.172     schwarze  535:                        return(ROFF_CONT);
1.152     kristaps  536:                }
                    537:
                    538:                cp++;
1.108     schwarze  539:
                    540:                /*
                    541:                 * The third character decides the length
1.181     schwarze  542:                 * of the name of the string or register.
1.108     schwarze  543:                 * Save a pointer to the name.
                    544:                 */
                    545:
1.94      kristaps  546:                switch (*cp) {
1.108     schwarze  547:                case ('\0'):
1.172     schwarze  548:                        return(ROFF_CONT);
1.94      kristaps  549:                case ('('):
                    550:                        cp++;
                    551:                        maxl = 2;
                    552:                        break;
                    553:                case ('['):
                    554:                        cp++;
                    555:                        maxl = 0;
                    556:                        break;
                    557:                default:
                    558:                        maxl = 1;
                    559:                        break;
                    560:                }
1.108     schwarze  561:                stnam = cp;
1.94      kristaps  562:
1.108     schwarze  563:                /* Advance to the end of the name. */
1.94      kristaps  564:
1.181     schwarze  565:                for (naml = 0; 0 == maxl || naml < maxl; naml++, cp++) {
1.153     kristaps  566:                        if ('\0' == *cp) {
                    567:                                mandoc_msg
                    568:                                        (MANDOCERR_BADESCAPE,
                    569:                                         r->parse, ln,
                    570:                                         (int)(stesc - *bufp), NULL);
1.172     schwarze  571:                                return(ROFF_CONT);
1.153     kristaps  572:                        }
1.94      kristaps  573:                        if (0 == maxl && ']' == *cp)
                    574:                                break;
                    575:                }
                    576:
1.108     schwarze  577:                /*
                    578:                 * Retrieve the replacement string; if it is
                    579:                 * undefined, resume searching for escapes.
                    580:                 */
                    581:
1.181     schwarze  582:                if (NULL == res)
                    583:                        res = roff_getstrn(r, stnam, naml);
                    584:                else
                    585:                        snprintf(ubuf, sizeof(ubuf), "%d",
                    586:                            roff_getregn(r, stnam, naml));
1.94      kristaps  587:
                    588:                if (NULL == res) {
1.153     kristaps  589:                        mandoc_msg
                    590:                                (MANDOCERR_BADESCAPE, r->parse,
                    591:                                 ln, (int)(stesc - *bufp), NULL);
1.142     kristaps  592:                        res = "";
1.94      kristaps  593:                }
                    594:
1.108     schwarze  595:                /* Replace the escape sequence by the string. */
                    596:
1.161     kristaps  597:                pos = stesc - *bufp;
1.154     kristaps  598:
1.94      kristaps  599:                nsz = *szp + strlen(res) + 1;
1.181     schwarze  600:                nbuf = mandoc_malloc(nsz);
1.94      kristaps  601:
1.181     schwarze  602:                strlcpy(nbuf, *bufp, (size_t)(stesc - *bufp + 1));
                    603:                strlcat(nbuf, res, nsz);
                    604:                strlcat(nbuf, cp + (maxl ? 0 : 1), nsz);
1.94      kristaps  605:
                    606:                free(*bufp);
                    607:
1.181     schwarze  608:                *bufp = nbuf;
1.94      kristaps  609:                *szp = nsz;
1.170     schwarze  610:
                    611:                if (EXPAND_LIMIT >= ++expand_count)
                    612:                        goto again;
                    613:
                    614:                /* Just leave the string unexpanded. */
                    615:                mandoc_msg(MANDOCERR_ROFFLOOP, r->parse, ln, pos, NULL);
1.172     schwarze  616:                return(ROFF_IGN);
1.154     kristaps  617:        }
1.172     schwarze  618:        return(ROFF_CONT);
1.154     kristaps  619: }
                    620:
                    621: /*
1.178     schwarze  622:  * Process text streams:
                    623:  * Convert all breakable hyphens into ASCII_HYPH.
                    624:  * Decrement and spring input line trap.
1.154     kristaps  625:  */
                    626: static enum rofferr
1.178     schwarze  627: roff_parsetext(char **bufp, size_t *szp, int pos, int *offs)
1.154     kristaps  628: {
                    629:        size_t           sz;
                    630:        const char      *start;
1.178     schwarze  631:        char            *p;
                    632:        int              isz;
1.154     kristaps  633:        enum mandoc_esc  esc;
                    634:
1.178     schwarze  635:        start = p = *bufp + pos;
1.154     kristaps  636:
                    637:        while ('\0' != *p) {
                    638:                sz = strcspn(p, "-\\");
                    639:                p += sz;
                    640:
1.159     kristaps  641:                if ('\0' == *p)
                    642:                        break;
                    643:
1.154     kristaps  644:                if ('\\' == *p) {
                    645:                        /* Skip over escapes. */
                    646:                        p++;
1.189     schwarze  647:                        esc = mandoc_escape((const char **)&p, NULL, NULL);
1.154     kristaps  648:                        if (ESCAPE_ERROR == esc)
                    649:                                break;
1.155     kristaps  650:                        continue;
1.159     kristaps  651:                } else if (p == start) {
1.158     kristaps  652:                        p++;
1.155     kristaps  653:                        continue;
1.158     kristaps  654:                }
1.155     kristaps  655:
1.171     schwarze  656:                if (isalpha((unsigned char)p[-1]) &&
                    657:                    isalpha((unsigned char)p[1]))
1.155     kristaps  658:                        *p = ASCII_HYPH;
                    659:                p++;
1.94      kristaps  660:        }
                    661:
1.178     schwarze  662:        /* Spring the input line trap. */
                    663:        if (1 == roffit_lines) {
1.202     schwarze  664:                isz = mandoc_asprintf(&p, "%s\n.%s", *bufp, roffit_macro);
1.178     schwarze  665:                free(*bufp);
                    666:                *bufp = p;
                    667:                *szp = isz + 1;
                    668:                *offs = 0;
                    669:                free(roffit_macro);
                    670:                roffit_lines = 0;
                    671:                return(ROFF_REPARSE);
                    672:        } else if (1 < roffit_lines)
                    673:                --roffit_lines;
1.154     kristaps  674:        return(ROFF_CONT);
1.94      kristaps  675: }
                    676:
1.67      kristaps  677: enum rofferr
1.90      kristaps  678: roff_parseln(struct roff *r, int ln, char **bufp,
                    679:                size_t *szp, int pos, int *offs)
1.67      kristaps  680: {
                    681:        enum rofft       t;
1.109     kristaps  682:        enum rofferr     e;
1.130     kristaps  683:        int              ppos, ctl;
1.79      kristaps  684:
                    685:        /*
1.94      kristaps  686:         * Run the reserved-word filter only if we have some reserved
                    687:         * words to fill in.
                    688:         */
                    689:
1.172     schwarze  690:        e = roff_res(r, bufp, szp, ln, pos);
                    691:        if (ROFF_IGN == e)
                    692:                return(e);
                    693:        assert(ROFF_CONT == e);
1.94      kristaps  694:
1.130     kristaps  695:        ppos = pos;
1.174     kristaps  696:        ctl = roff_getcontrol(r, *bufp, &pos);
1.130     kristaps  697:
1.94      kristaps  698:        /*
1.79      kristaps  699:         * First, if a scope is open and we're not a macro, pass the
                    700:         * text through the macro's filter.  If a scope isn't open and
                    701:         * we're not a macro, just let it through.
1.125     kristaps  702:         * Finally, if there's an equation scope open, divert it into it
                    703:         * no matter our state.
1.79      kristaps  704:         */
1.74      kristaps  705:
1.130     kristaps  706:        if (r->last && ! ctl) {
1.78      kristaps  707:                t = r->last->tok;
                    708:                assert(roffs[t].text);
1.109     kristaps  709:                e = (*roffs[t].text)
                    710:                        (r, t, bufp, szp, ln, pos, pos, offs);
                    711:                assert(ROFF_IGN == e || ROFF_CONT == e);
1.125     kristaps  712:                if (ROFF_CONT != e)
                    713:                        return(e);
1.182     schwarze  714:        }
                    715:        if (r->eqn)
                    716:                return(eqn_read(&r->eqn, ln, *bufp, ppos, offs));
                    717:        if ( ! ctl) {
1.125     kristaps  718:                if (r->tbl)
1.130     kristaps  719:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.178     schwarze  720:                return(roff_parsetext(bufp, szp, pos, offs));
1.182     schwarze  721:        }
1.67      kristaps  722:
1.79      kristaps  723:        /*
                    724:         * If a scope is open, go to the child handler for that macro,
                    725:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  726:         * Don't do so if an equation is open.
1.79      kristaps  727:         */
1.78      kristaps  728:
1.79      kristaps  729:        if (r->last) {
                    730:                t = r->last->tok;
                    731:                assert(roffs[t].sub);
                    732:                return((*roffs[t].sub)
1.90      kristaps  733:                                (r, t, bufp, szp,
1.130     kristaps  734:                                 ln, ppos, pos, offs));
1.79      kristaps  735:        }
1.78      kristaps  736:
1.79      kristaps  737:        /*
                    738:         * Lastly, as we've no scope open, try to look up and execute
                    739:         * the new macro.  If no macro is found, simply return and let
                    740:         * the compilers handle it.
                    741:         */
1.67      kristaps  742:
1.106     kristaps  743:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos)))
1.79      kristaps  744:                return(ROFF_CONT);
1.67      kristaps  745:
1.75      kristaps  746:        assert(roffs[t].proc);
1.78      kristaps  747:        return((*roffs[t].proc)
1.90      kristaps  748:                        (r, t, bufp, szp,
                    749:                         ln, ppos, pos, offs));
1.74      kristaps  750: }
                    751:
                    752:
1.117     kristaps  753: void
1.74      kristaps  754: roff_endparse(struct roff *r)
                    755: {
                    756:
1.110     kristaps  757:        if (r->last)
1.128     kristaps  758:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.109     kristaps  759:                                r->last->line, r->last->col, NULL);
1.117     kristaps  760:
1.125     kristaps  761:        if (r->eqn) {
1.128     kristaps  762:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.148     kristaps  763:                                r->eqn->eqn.ln, r->eqn->eqn.pos, NULL);
1.151     kristaps  764:                eqn_end(&r->eqn);
1.125     kristaps  765:        }
                    766:
1.117     kristaps  767:        if (r->tbl) {
1.128     kristaps  768:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.117     kristaps  769:                                r->tbl->line, r->tbl->pos, NULL);
1.151     kristaps  770:                tbl_end(&r->tbl);
1.117     kristaps  771:        }
1.67      kristaps  772: }
                    773:
                    774: /*
                    775:  * Parse a roff node's type from the input buffer.  This must be in the
                    776:  * form of ".foo xxx" in the usual way.
                    777:  */
                    778: static enum rofft
1.106     kristaps  779: roff_parse(struct roff *r, const char *buf, int *pos)
1.67      kristaps  780: {
1.106     kristaps  781:        const char      *mac;
                    782:        size_t           maclen;
1.67      kristaps  783:        enum rofft       t;
                    784:
1.144     kristaps  785:        if ('\0' == buf[*pos] || '"' == buf[*pos] ||
                    786:                        '\t' == buf[*pos] || ' ' == buf[*pos])
1.67      kristaps  787:                return(ROFF_MAX);
                    788:
1.195     schwarze  789:        /* We stop the macro parse at an escape, tab, space, or nil. */
1.144     kristaps  790:
1.106     kristaps  791:        mac = buf + *pos;
1.195     schwarze  792:        maclen = strcspn(mac, " \\\t\0");
1.67      kristaps  793:
1.106     kristaps  794:        t = (r->current_string = roff_getstrn(r, mac, maclen))
1.155     kristaps  795:            ? ROFF_USERDEF : roffhash_find(mac, maclen);
1.67      kristaps  796:
1.127     kristaps  797:        *pos += (int)maclen;
1.130     kristaps  798:
1.67      kristaps  799:        while (buf[*pos] && ' ' == buf[*pos])
                    800:                (*pos)++;
                    801:
                    802:        return(t);
                    803: }
                    804:
                    805: /* ARGSUSED */
                    806: static enum rofferr
1.76      kristaps  807: roff_cblock(ROFF_ARGS)
1.67      kristaps  808: {
                    809:
1.79      kristaps  810:        /*
                    811:         * A block-close `..' should only be invoked as a child of an
                    812:         * ignore macro, otherwise raise a warning and just ignore it.
                    813:         */
                    814:
1.76      kristaps  815:        if (NULL == r->last) {
1.128     kristaps  816:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  817:                return(ROFF_IGN);
                    818:        }
1.67      kristaps  819:
1.81      kristaps  820:        switch (r->last->tok) {
                    821:        case (ROFF_am):
                    822:                /* FALLTHROUGH */
                    823:        case (ROFF_ami):
                    824:                /* FALLTHROUGH */
                    825:        case (ROFF_am1):
                    826:                /* FALLTHROUGH */
                    827:        case (ROFF_de):
1.108     schwarze  828:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  829:                /* FALLTHROUGH */
                    830:        case (ROFF_dei):
                    831:                /* FALLTHROUGH */
                    832:        case (ROFF_ig):
                    833:                break;
                    834:        default:
1.128     kristaps  835:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.67      kristaps  836:                return(ROFF_IGN);
1.76      kristaps  837:        }
1.67      kristaps  838:
1.76      kristaps  839:        if ((*bufp)[pos])
1.128     kristaps  840:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.71      kristaps  841:
                    842:        roffnode_pop(r);
1.76      kristaps  843:        roffnode_cleanscope(r);
                    844:        return(ROFF_IGN);
1.71      kristaps  845:
1.67      kristaps  846: }
                    847:
                    848:
1.76      kristaps  849: static void
                    850: roffnode_cleanscope(struct roff *r)
1.67      kristaps  851: {
                    852:
1.76      kristaps  853:        while (r->last) {
1.173     schwarze  854:                if (--r->last->endspan != 0)
1.76      kristaps  855:                        break;
                    856:                roffnode_pop(r);
                    857:        }
1.67      kristaps  858: }
                    859:
                    860:
1.195     schwarze  861: static void
                    862: roff_ccond(struct roff *r, int ln, int ppos)
1.74      kristaps  863: {
                    864:
1.76      kristaps  865:        if (NULL == r->last) {
1.128     kristaps  866:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.195     schwarze  867:                return;
1.76      kristaps  868:        }
                    869:
1.82      kristaps  870:        switch (r->last->tok) {
                    871:        case (ROFF_el):
                    872:                /* FALLTHROUGH */
                    873:        case (ROFF_ie):
                    874:                /* FALLTHROUGH */
                    875:        case (ROFF_if):
                    876:                break;
                    877:        default:
1.128     kristaps  878:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.195     schwarze  879:                return;
1.75      kristaps  880:        }
                    881:
1.76      kristaps  882:        if (r->last->endspan > -1) {
1.128     kristaps  883:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.195     schwarze  884:                return;
1.76      kristaps  885:        }
                    886:
1.75      kristaps  887:        roffnode_pop(r);
1.76      kristaps  888:        roffnode_cleanscope(r);
1.195     schwarze  889:        return;
1.76      kristaps  890: }
                    891:
1.75      kristaps  892:
1.76      kristaps  893: /* ARGSUSED */
                    894: static enum rofferr
1.80      kristaps  895: roff_block(ROFF_ARGS)
1.76      kristaps  896: {
1.78      kristaps  897:        int             sv;
                    898:        size_t          sz;
1.106     kristaps  899:        char            *name;
                    900:
                    901:        name = NULL;
1.76      kristaps  902:
1.106     kristaps  903:        if (ROFF_ig != tok) {
                    904:                if ('\0' == (*bufp)[pos]) {
1.128     kristaps  905:                        mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.106     kristaps  906:                        return(ROFF_IGN);
                    907:                }
1.107     kristaps  908:
                    909:                /*
                    910:                 * Re-write `de1', since we don't really care about
                    911:                 * groff's strange compatibility mode, into `de'.
                    912:                 */
                    913:
1.106     kristaps  914:                if (ROFF_de1 == tok)
                    915:                        tok = ROFF_de;
                    916:                if (ROFF_de == tok)
                    917:                        name = *bufp + pos;
                    918:                else
1.128     kristaps  919:                        mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos,
1.106     kristaps  920:                            roffs[tok].name);
1.107     kristaps  921:
1.131     schwarze  922:                while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.80      kristaps  923:                        pos++;
1.107     kristaps  924:
1.131     schwarze  925:                while (isspace((unsigned char)(*bufp)[pos]))
1.106     kristaps  926:                        (*bufp)[pos++] = '\0';
1.80      kristaps  927:        }
                    928:
1.106     kristaps  929:        roffnode_push(r, tok, name, ln, ppos);
                    930:
                    931:        /*
                    932:         * At the beginning of a `de' macro, clear the existing string
                    933:         * with the same name, if there is one.  New content will be
1.193     schwarze  934:         * appended from roff_block_text() in multiline mode.
1.106     kristaps  935:         */
1.107     kristaps  936:
1.106     kristaps  937:        if (ROFF_de == tok)
1.108     schwarze  938:                roff_setstr(r, name, "", 0);
1.76      kristaps  939:
1.79      kristaps  940:        if ('\0' == (*bufp)[pos])
1.78      kristaps  941:                return(ROFF_IGN);
                    942:
1.107     kristaps  943:        /* If present, process the custom end-of-line marker. */
                    944:
1.78      kristaps  945:        sv = pos;
1.131     schwarze  946:        while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.78      kristaps  947:                pos++;
                    948:
                    949:        /*
                    950:         * Note: groff does NOT like escape characters in the input.
                    951:         * Instead of detecting this, we're just going to let it fly and
                    952:         * to hell with it.
                    953:         */
                    954:
                    955:        assert(pos > sv);
                    956:        sz = (size_t)(pos - sv);
                    957:
1.79      kristaps  958:        if (1 == sz && '.' == (*bufp)[sv])
                    959:                return(ROFF_IGN);
                    960:
1.98      schwarze  961:        r->last->end = mandoc_malloc(sz + 1);
1.78      kristaps  962:
                    963:        memcpy(r->last->end, *bufp + sv, sz);
                    964:        r->last->end[(int)sz] = '\0';
                    965:
1.77      kristaps  966:        if ((*bufp)[pos])
1.128     kristaps  967:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.74      kristaps  968:
1.78      kristaps  969:        return(ROFF_IGN);
                    970: }
                    971:
                    972:
                    973: /* ARGSUSED */
                    974: static enum rofferr
1.80      kristaps  975: roff_block_sub(ROFF_ARGS)
1.79      kristaps  976: {
                    977:        enum rofft      t;
                    978:        int             i, j;
                    979:
                    980:        /*
                    981:         * First check whether a custom macro exists at this level.  If
                    982:         * it does, then check against it.  This is some of groff's
                    983:         * stranger behaviours.  If we encountered a custom end-scope
                    984:         * tag and that tag also happens to be a "real" macro, then we
                    985:         * need to try interpreting it again as a real macro.  If it's
                    986:         * not, then return ignore.  Else continue.
                    987:         */
                    988:
                    989:        if (r->last->end) {
1.130     kristaps  990:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.79      kristaps  991:                        if ((*bufp)[i] != r->last->end[j])
                    992:                                break;
                    993:
                    994:                if ('\0' == r->last->end[j] &&
                    995:                                ('\0' == (*bufp)[i] ||
                    996:                                 ' ' == (*bufp)[i] ||
                    997:                                 '\t' == (*bufp)[i])) {
                    998:                        roffnode_pop(r);
                    999:                        roffnode_cleanscope(r);
                   1000:
1.130     kristaps 1001:                        while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
                   1002:                                i++;
                   1003:
                   1004:                        pos = i;
1.106     kristaps 1005:                        if (ROFF_MAX != roff_parse(r, *bufp, &pos))
1.79      kristaps 1006:                                return(ROFF_RERUN);
                   1007:                        return(ROFF_IGN);
                   1008:                }
                   1009:        }
                   1010:
                   1011:        /*
                   1012:         * If we have no custom end-query or lookup failed, then try
                   1013:         * pulling it out of the hashtable.
                   1014:         */
                   1015:
1.137     schwarze 1016:        t = roff_parse(r, *bufp, &pos);
1.79      kristaps 1017:
1.106     kristaps 1018:        /*
                   1019:         * Macros other than block-end are only significant
                   1020:         * in `de' blocks; elsewhere, simply throw them away.
                   1021:         */
                   1022:        if (ROFF_cblock != t) {
                   1023:                if (ROFF_de == tok)
1.193     schwarze 1024:                        roff_setstr(r, r->last->name, *bufp + ppos, 2);
1.79      kristaps 1025:                return(ROFF_IGN);
1.106     kristaps 1026:        }
1.79      kristaps 1027:
                   1028:        assert(roffs[t].proc);
1.90      kristaps 1029:        return((*roffs[t].proc)(r, t, bufp, szp,
                   1030:                                ln, ppos, pos, offs));
1.79      kristaps 1031: }
                   1032:
                   1033:
                   1034: /* ARGSUSED */
                   1035: static enum rofferr
1.80      kristaps 1036: roff_block_text(ROFF_ARGS)
1.78      kristaps 1037: {
                   1038:
1.106     kristaps 1039:        if (ROFF_de == tok)
1.193     schwarze 1040:                roff_setstr(r, r->last->name, *bufp + pos, 2);
1.106     kristaps 1041:
1.78      kristaps 1042:        return(ROFF_IGN);
                   1043: }
                   1044:
                   1045:
                   1046: /* ARGSUSED */
                   1047: static enum rofferr
1.82      kristaps 1048: roff_cond_sub(ROFF_ARGS)
                   1049: {
                   1050:        enum rofft       t;
1.139     kristaps 1051:        char            *ep;
1.198     schwarze 1052:        int              rr;
1.82      kristaps 1053:
                   1054:        rr = r->last->rule;
1.139     kristaps 1055:        roffnode_cleanscope(r);
1.177     schwarze 1056:        t = roff_parse(r, *bufp, &pos);
1.82      kristaps 1057:
1.139     kristaps 1058:        /*
1.177     schwarze 1059:         * Fully handle known macros when they are structurally
                   1060:         * required or when the conditional evaluated to true.
1.87      kristaps 1061:         */
                   1062:
1.177     schwarze 1063:        if ((ROFF_MAX != t) &&
1.198     schwarze 1064:            (rr || ROFFMAC_STRUCT & roffs[t].flags)) {
1.177     schwarze 1065:                assert(roffs[t].proc);
                   1066:                return((*roffs[t].proc)(r, t, bufp, szp,
                   1067:                                        ln, ppos, pos, offs));
                   1068:        }
1.144     kristaps 1069:
1.196     schwarze 1070:        /*
                   1071:         * If `\}' occurs on a macro line without a preceding macro,
                   1072:         * drop the line completely.
                   1073:         */
                   1074:
                   1075:        ep = *bufp + pos;
                   1076:        if ('\\' == ep[0] && '}' == ep[1])
1.198     schwarze 1077:                rr = 0;
1.196     schwarze 1078:
1.177     schwarze 1079:        /* Always check for the closing delimiter `\}'. */
1.144     kristaps 1080:
1.177     schwarze 1081:        while (NULL != (ep = strchr(ep, '\\'))) {
1.197     schwarze 1082:                if ('}' == *(++ep)) {
                   1083:                        *ep = '&';
                   1084:                        roff_ccond(r, ln, ep - *bufp - 1);
                   1085:                }
                   1086:                ++ep;
1.177     schwarze 1087:        }
1.198     schwarze 1088:        return(rr ? ROFF_CONT : ROFF_IGN);
1.82      kristaps 1089: }
                   1090:
                   1091: /* ARGSUSED */
                   1092: static enum rofferr
                   1093: roff_cond_text(ROFF_ARGS)
1.78      kristaps 1094: {
1.140     kristaps 1095:        char            *ep;
1.198     schwarze 1096:        int              rr;
1.82      kristaps 1097:
                   1098:        rr = r->last->rule;
1.140     kristaps 1099:        roffnode_cleanscope(r);
1.82      kristaps 1100:
1.197     schwarze 1101:        ep = *bufp + pos;
                   1102:        while (NULL != (ep = strchr(ep, '\\'))) {
                   1103:                if ('}' == *(++ep)) {
                   1104:                        *ep = '&';
                   1105:                        roff_ccond(r, ln, ep - *bufp - 1);
                   1106:                }
                   1107:                ++ep;
1.78      kristaps 1108:        }
1.198     schwarze 1109:        return(rr ? ROFF_CONT : ROFF_IGN);
1.74      kristaps 1110: }
                   1111:
1.204   ! schwarze 1112: /*
        !          1113:  * Parse a single signed integer number.  Stop at the first non-digit.
        !          1114:  * If there is at least one digit, return success and advance the
        !          1115:  * parse point, else return failure and let the parse point unchanged.
        !          1116:  * Ignore overflows, treat them just like the C language.
        !          1117:  */
1.184     schwarze 1118: static int
                   1119: roff_getnum(const char *v, int *pos, int *res)
                   1120: {
                   1121:        int p, n;
                   1122:
                   1123:        p = *pos;
                   1124:        n = v[p] == '-';
                   1125:        if (n)
                   1126:                p++;
                   1127:
                   1128:        for (*res = 0; isdigit((unsigned char)v[p]); p++)
1.204   ! schwarze 1129:                *res = 10 * *res + v[p] - '0';
1.184     schwarze 1130:        if (p == *pos + n)
                   1131:                return 0;
                   1132:
                   1133:        if (n)
                   1134:                *res = -*res;
                   1135:
                   1136:        *pos = p;
                   1137:        return 1;
                   1138: }
                   1139:
1.198     schwarze 1140: /*
                   1141:  * Evaluate a string comparison condition.
                   1142:  * The first character is the delimiter.
                   1143:  * Succeed if the string up to its second occurrence
                   1144:  * matches the string up to its third occurence.
                   1145:  * Advance the cursor after the third occurrence
                   1146:  * or lacking that, to the end of the line.
                   1147:  */
                   1148: static int
                   1149: roff_evalstrcond(const char *v, int *pos)
                   1150: {
                   1151:        const char      *s1, *s2, *s3;
                   1152:        int              match;
                   1153:
                   1154:        match = 0;
                   1155:        s1 = v + *pos;          /* initial delimiter */
                   1156:        s2 = s1 + 1;            /* for scanning the first string */
                   1157:        s3 = strchr(s2, *s1);   /* for scanning the second string */
                   1158:
                   1159:        if (NULL == s3)         /* found no middle delimiter */
                   1160:                goto out;
                   1161:
                   1162:        while ('\0' != *++s3) {
                   1163:                if (*s2 != *s3) {  /* mismatch */
                   1164:                        s3 = strchr(s3, *s1);
                   1165:                        break;
                   1166:                }
                   1167:                if (*s3 == *s1) {  /* found the final delimiter */
                   1168:                        match = 1;
                   1169:                        break;
                   1170:                }
                   1171:                s2++;
                   1172:        }
                   1173:
                   1174: out:
                   1175:        if (NULL == s3)
                   1176:                s3 = strchr(s2, '\0');
                   1177:        else
                   1178:                s3++;
                   1179:        *pos = s3 - v;
                   1180:        return(match);
                   1181: }
                   1182:
1.204   ! schwarze 1183: /*
        !          1184:  * Evaluate an optionally negated single character, numerical,
        !          1185:  * or string condition.
        !          1186:  */
1.198     schwarze 1187: static int
1.88      kristaps 1188: roff_evalcond(const char *v, int *pos)
                   1189: {
1.204   ! schwarze 1190:        int      wanttrue, number;
1.88      kristaps 1191:
1.198     schwarze 1192:        if ('!' == v[*pos]) {
                   1193:                wanttrue = 0;
                   1194:                (*pos)++;
                   1195:        } else
                   1196:                wanttrue = 1;
                   1197:
1.88      kristaps 1198:        switch (v[*pos]) {
                   1199:        case ('n'):
1.198     schwarze 1200:                /* FALLTHROUGH */
                   1201:        case ('o'):
1.88      kristaps 1202:                (*pos)++;
1.198     schwarze 1203:                return(wanttrue);
                   1204:        case ('c'):
                   1205:                /* FALLTHROUGH */
                   1206:        case ('d'):
                   1207:                /* FALLTHROUGH */
1.88      kristaps 1208:        case ('e'):
                   1209:                /* FALLTHROUGH */
1.198     schwarze 1210:        case ('r'):
1.88      kristaps 1211:                /* FALLTHROUGH */
                   1212:        case ('t'):
                   1213:                (*pos)++;
1.198     schwarze 1214:                return(!wanttrue);
1.88      kristaps 1215:        default:
                   1216:                break;
                   1217:        }
                   1218:
1.204   ! schwarze 1219:        if (roff_evalnum(v, pos, &number, 0))
        !          1220:                return((number > 0) == wanttrue);
        !          1221:        else
1.198     schwarze 1222:                return(roff_evalstrcond(v, pos) == wanttrue);
1.88      kristaps 1223: }
                   1224:
1.75      kristaps 1225: /* ARGSUSED */
1.74      kristaps 1226: static enum rofferr
1.103     kristaps 1227: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1228: {
1.123     schwarze 1229:
1.89      kristaps 1230:        return(ROFF_IGN);
                   1231: }
                   1232:
1.104     kristaps 1233: /* ARGSUSED */
                   1234: static enum rofferr
1.82      kristaps 1235: roff_cond(ROFF_ARGS)
1.74      kristaps 1236: {
1.173     schwarze 1237:
                   1238:        roffnode_push(r, tok, NULL, ln, ppos);
1.74      kristaps 1239:
1.134     kristaps 1240:        /*
                   1241:         * An `.el' has no conditional body: it will consume the value
                   1242:         * of the current rstack entry set in prior `ie' calls or
                   1243:         * defaults to DENY.
                   1244:         *
                   1245:         * If we're not an `el', however, then evaluate the conditional.
                   1246:         */
1.133     kristaps 1247:
1.173     schwarze 1248:        r->last->rule = ROFF_el == tok ?
1.198     schwarze 1249:                (r->rstackpos < 0 ? 0 : r->rstack[r->rstackpos--]) :
1.134     kristaps 1250:                roff_evalcond(*bufp, &pos);
1.77      kristaps 1251:
1.134     kristaps 1252:        /*
                   1253:         * An if-else will put the NEGATION of the current evaluated
                   1254:         * conditional into the stack of rules.
                   1255:         */
                   1256:
1.84      schwarze 1257:        if (ROFF_ie == tok) {
1.134     kristaps 1258:                if (r->rstackpos == RSTACK_MAX - 1) {
                   1259:                        mandoc_msg(MANDOCERR_MEM,
                   1260:                                r->parse, ln, ppos, NULL);
                   1261:                        return(ROFF_ERR);
                   1262:                }
1.198     schwarze 1263:                r->rstack[++r->rstackpos] = !r->last->rule;
1.82      kristaps 1264:        }
1.88      kristaps 1265:
                   1266:        /* If the parent has false as its rule, then so do we. */
                   1267:
1.198     schwarze 1268:        if (r->last->parent && !r->last->parent->rule)
                   1269:                r->last->rule = 0;
1.88      kristaps 1270:
                   1271:        /*
1.173     schwarze 1272:         * Determine scope.
                   1273:         * If there is nothing on the line after the conditional,
                   1274:         * not even whitespace, use next-line scope.
1.88      kristaps 1275:         */
1.74      kristaps 1276:
1.173     schwarze 1277:        if ('\0' == (*bufp)[pos]) {
                   1278:                r->last->endspan = 2;
                   1279:                goto out;
                   1280:        }
                   1281:
                   1282:        while (' ' == (*bufp)[pos])
                   1283:                pos++;
                   1284:
                   1285:        /* An opening brace requests multiline scope. */
1.75      kristaps 1286:
                   1287:        if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
                   1288:                r->last->endspan = -1;
                   1289:                pos += 2;
1.173     schwarze 1290:                goto out;
1.109     kristaps 1291:        }
1.74      kristaps 1292:
1.77      kristaps 1293:        /*
1.173     schwarze 1294:         * Anything else following the conditional causes
                   1295:         * single-line scope.  Warn if the scope contains
                   1296:         * nothing but trailing whitespace.
1.77      kristaps 1297:         */
                   1298:
1.75      kristaps 1299:        if ('\0' == (*bufp)[pos])
1.173     schwarze 1300:                mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.77      kristaps 1301:
1.173     schwarze 1302:        r->last->endspan = 1;
1.74      kristaps 1303:
1.173     schwarze 1304: out:
1.75      kristaps 1305:        *offs = pos;
                   1306:        return(ROFF_RERUN);
1.83      schwarze 1307: }
                   1308:
                   1309:
                   1310: /* ARGSUSED */
                   1311: static enum rofferr
1.92      schwarze 1312: roff_ds(ROFF_ARGS)
                   1313: {
1.96      kristaps 1314:        char            *name, *string;
                   1315:
                   1316:        /*
                   1317:         * A symbol is named by the first word following the macro
                   1318:         * invocation up to a space.  Its value is anything after the
                   1319:         * name's trailing whitespace and optional double-quote.  Thus,
                   1320:         *
                   1321:         *  [.ds foo "bar  "     ]
                   1322:         *
                   1323:         * will have `bar  "     ' as its value.
                   1324:         */
1.92      schwarze 1325:
1.121     schwarze 1326:        string = *bufp + pos;
                   1327:        name = roff_getname(r, &string, ln, pos);
1.92      schwarze 1328:        if ('\0' == *name)
                   1329:                return(ROFF_IGN);
                   1330:
1.121     schwarze 1331:        /* Read past initial double-quote. */
                   1332:        if ('"' == *string)
1.92      schwarze 1333:                string++;
                   1334:
1.96      kristaps 1335:        /* The rest is the value. */
1.193     schwarze 1336:        roff_setstr(r, name, string, ROFF_as == tok);
1.92      schwarze 1337:        return(ROFF_IGN);
                   1338: }
                   1339:
1.204   ! schwarze 1340: /*
        !          1341:  * Parse a single operator, one or two characters long.
        !          1342:  * If the operator is recognized, return success and advance the
        !          1343:  * parse point, else return failure and let the parse point unchanged.
        !          1344:  */
        !          1345: static int
        !          1346: roff_getop(const char *v, int *pos, char *res)
        !          1347: {
        !          1348:
        !          1349:        *res = v[*pos];
        !          1350:
        !          1351:        switch (*res) {
        !          1352:        case ('+'):
        !          1353:                /* FALLTHROUGH */
        !          1354:        case ('-'):
        !          1355:                /* FALLTHROUGH */
        !          1356:        case ('*'):
        !          1357:                /* FALLTHROUGH */
        !          1358:        case ('/'):
        !          1359:                /* FALLTHROUGH */
        !          1360:        case ('%'):
        !          1361:                /* FALLTHROUGH */
        !          1362:        case ('&'):
        !          1363:                /* FALLTHROUGH */
        !          1364:        case (':'):
        !          1365:                break;
        !          1366:        case '<':
        !          1367:                switch (v[*pos + 1]) {
        !          1368:                case ('='):
        !          1369:                        *res = 'l';
        !          1370:                        (*pos)++;
        !          1371:                        break;
        !          1372:                case ('>'):
        !          1373:                        *res = '!';
        !          1374:                        (*pos)++;
        !          1375:                        break;
        !          1376:                case ('?'):
        !          1377:                        *res = 'i';
        !          1378:                        (*pos)++;
        !          1379:                        break;
        !          1380:                default:
        !          1381:                        break;
        !          1382:                }
        !          1383:                break;
        !          1384:        case '>':
        !          1385:                switch (v[*pos + 1]) {
        !          1386:                case ('='):
        !          1387:                        *res = 'g';
        !          1388:                        (*pos)++;
        !          1389:                        break;
        !          1390:                case ('?'):
        !          1391:                        *res = 'a';
        !          1392:                        (*pos)++;
        !          1393:                        break;
        !          1394:                default:
        !          1395:                        break;
        !          1396:                }
        !          1397:                break;
        !          1398:        case '=':
        !          1399:                if ('=' == v[*pos + 1])
        !          1400:                        (*pos)++;
        !          1401:                break;
        !          1402:        default:
        !          1403:                return(0);
        !          1404:        }
        !          1405:        (*pos)++;
        !          1406:
        !          1407:        return(*res);
        !          1408: }
        !          1409:
        !          1410: /*
        !          1411:  * Evaluate either a parenthesized numeric expression
        !          1412:  * or a single signed integer number.
        !          1413:  */
        !          1414: static int
        !          1415: roff_evalpar(const char *v, int *pos, int *res)
        !          1416: {
        !          1417:
        !          1418:        if ('(' != v[*pos])
        !          1419:                return(roff_getnum(v, pos, res));
        !          1420:
        !          1421:        (*pos)++;
        !          1422:        if ( ! roff_evalnum(v, pos, res, 1))
        !          1423:                return(0);
        !          1424:
        !          1425:        /* If the trailing parenthesis is missing, ignore the error. */
        !          1426:        if (')' == v[*pos])
        !          1427:                (*pos)++;
        !          1428:
        !          1429:        return(1);
        !          1430: }
        !          1431:
        !          1432: /*
        !          1433:  * Evaluate a complete numeric expression.
        !          1434:  * Proceed left to right, there is no concept of precedence.
        !          1435:  */
        !          1436: static int
        !          1437: roff_evalnum(const char *v, int *pos, int *res, int skipwhite)
        !          1438: {
        !          1439:        int              mypos, operand2;
        !          1440:        char             operator;
        !          1441:
        !          1442:        if (NULL == pos) {
        !          1443:                mypos = 0;
        !          1444:                pos = &mypos;
        !          1445:        }
        !          1446:
        !          1447:        if (skipwhite)
        !          1448:                while (isspace((unsigned char)v[*pos]))
        !          1449:                        (*pos)++;
        !          1450:
        !          1451:        if ( ! roff_evalpar(v, pos, res))
        !          1452:                return(0);
        !          1453:
        !          1454:        while (1) {
        !          1455:                if (skipwhite)
        !          1456:                        while (isspace((unsigned char)v[*pos]))
        !          1457:                                (*pos)++;
        !          1458:
        !          1459:                if ( ! roff_getop(v, pos, &operator))
        !          1460:                        break;
        !          1461:
        !          1462:                if (skipwhite)
        !          1463:                        while (isspace((unsigned char)v[*pos]))
        !          1464:                                (*pos)++;
        !          1465:
        !          1466:                if ( ! roff_evalpar(v, pos, &operand2))
        !          1467:                        return(0);
        !          1468:
        !          1469:                if (skipwhite)
        !          1470:                        while (isspace((unsigned char)v[*pos]))
        !          1471:                                (*pos)++;
        !          1472:
        !          1473:                switch (operator) {
        !          1474:                case ('+'):
        !          1475:                        *res += operand2;
        !          1476:                        break;
        !          1477:                case ('-'):
        !          1478:                        *res -= operand2;
        !          1479:                        break;
        !          1480:                case ('*'):
        !          1481:                        *res *= operand2;
        !          1482:                        break;
        !          1483:                case ('/'):
        !          1484:                        *res /= operand2;
        !          1485:                        break;
        !          1486:                case ('%'):
        !          1487:                        *res %= operand2;
        !          1488:                        break;
        !          1489:                case ('<'):
        !          1490:                        *res = *res < operand2;
        !          1491:                        break;
        !          1492:                case ('>'):
        !          1493:                        *res = *res > operand2;
        !          1494:                        break;
        !          1495:                case ('l'):
        !          1496:                        *res = *res <= operand2;
        !          1497:                        break;
        !          1498:                case ('g'):
        !          1499:                        *res = *res >= operand2;
        !          1500:                        break;
        !          1501:                case ('='):
        !          1502:                        *res = *res == operand2;
        !          1503:                        break;
        !          1504:                case ('!'):
        !          1505:                        *res = *res != operand2;
        !          1506:                        break;
        !          1507:                case ('&'):
        !          1508:                        *res = *res && operand2;
        !          1509:                        break;
        !          1510:                case (':'):
        !          1511:                        *res = *res || operand2;
        !          1512:                        break;
        !          1513:                case ('i'):
        !          1514:                        if (operand2 < *res)
        !          1515:                                *res = operand2;
        !          1516:                        break;
        !          1517:                case ('a'):
        !          1518:                        if (operand2 > *res)
        !          1519:                                *res = operand2;
        !          1520:                        break;
        !          1521:                default:
        !          1522:                        abort();
        !          1523:                }
        !          1524:        }
        !          1525:        return(1);
        !          1526: }
        !          1527:
1.180     schwarze 1528: void
1.187     schwarze 1529: roff_setreg(struct roff *r, const char *name, int val, char sign)
1.147     kristaps 1530: {
1.180     schwarze 1531:        struct roffreg  *reg;
                   1532:
                   1533:        /* Search for an existing register with the same name. */
                   1534:        reg = r->regtab;
                   1535:
                   1536:        while (reg && strcmp(name, reg->key.p))
                   1537:                reg = reg->next;
1.147     kristaps 1538:
1.180     schwarze 1539:        if (NULL == reg) {
                   1540:                /* Create a new register. */
                   1541:                reg = mandoc_malloc(sizeof(struct roffreg));
                   1542:                reg->key.p = mandoc_strdup(name);
                   1543:                reg->key.sz = strlen(name);
1.187     schwarze 1544:                reg->val = 0;
1.180     schwarze 1545:                reg->next = r->regtab;
                   1546:                r->regtab = reg;
                   1547:        }
                   1548:
1.187     schwarze 1549:        if ('+' == sign)
                   1550:                reg->val += val;
                   1551:        else if ('-' == sign)
                   1552:                reg->val -= val;
                   1553:        else
                   1554:                reg->val = val;
1.147     kristaps 1555: }
                   1556:
1.192     schwarze 1557: /*
                   1558:  * Handle some predefined read-only number registers.
                   1559:  * For now, return -1 if the requested register is not predefined;
                   1560:  * in case a predefined read-only register having the value -1
                   1561:  * were to turn up, another special value would have to be chosen.
                   1562:  */
                   1563: static int
                   1564: roff_getregro(const char *name)
                   1565: {
                   1566:
                   1567:        switch (*name) {
                   1568:        case ('A'):  /* ASCII approximation mode is always off. */
                   1569:                return(0);
                   1570:        case ('g'):  /* Groff compatibility mode is always on. */
                   1571:                return(1);
                   1572:        case ('H'):  /* Fixed horizontal resolution. */
                   1573:                return (24);
                   1574:        case ('j'):  /* Always adjust left margin only. */
                   1575:                return(0);
                   1576:        case ('T'):  /* Some output device is always defined. */
                   1577:                return(1);
                   1578:        case ('V'):  /* Fixed vertical resolution. */
                   1579:                return (40);
                   1580:        default:
                   1581:                return (-1);
                   1582:        }
                   1583: }
                   1584:
1.181     schwarze 1585: int
1.180     schwarze 1586: roff_getreg(const struct roff *r, const char *name)
1.147     kristaps 1587: {
1.180     schwarze 1588:        struct roffreg  *reg;
1.192     schwarze 1589:        int              val;
                   1590:
                   1591:        if ('.' == name[0] && '\0' != name[1] && '\0' == name[2]) {
                   1592:                val = roff_getregro(name + 1);
                   1593:                if (-1 != val)
                   1594:                        return (val);
                   1595:        }
1.180     schwarze 1596:
                   1597:        for (reg = r->regtab; reg; reg = reg->next)
                   1598:                if (0 == strcmp(name, reg->key.p))
1.181     schwarze 1599:                        return(reg->val);
                   1600:
                   1601:        return(0);
                   1602: }
                   1603:
                   1604: static int
                   1605: roff_getregn(const struct roff *r, const char *name, size_t len)
                   1606: {
                   1607:        struct roffreg  *reg;
1.192     schwarze 1608:        int              val;
                   1609:
                   1610:        if ('.' == name[0] && 2 == len) {
                   1611:                val = roff_getregro(name + 1);
                   1612:                if (-1 != val)
                   1613:                        return (val);
                   1614:        }
1.181     schwarze 1615:
                   1616:        for (reg = r->regtab; reg; reg = reg->next)
                   1617:                if (len == reg->key.sz &&
                   1618:                    0 == strncmp(name, reg->key.p, len))
                   1619:                        return(reg->val);
1.147     kristaps 1620:
1.180     schwarze 1621:        return(0);
1.147     kristaps 1622: }
                   1623:
1.180     schwarze 1624: static void
                   1625: roff_freereg(struct roffreg *reg)
1.147     kristaps 1626: {
1.180     schwarze 1627:        struct roffreg  *old_reg;
1.147     kristaps 1628:
1.180     schwarze 1629:        while (NULL != reg) {
                   1630:                free(reg->key.p);
                   1631:                old_reg = reg;
                   1632:                reg = reg->next;
                   1633:                free(old_reg);
                   1634:        }
1.147     kristaps 1635: }
1.92      schwarze 1636:
                   1637: static enum rofferr
1.89      kristaps 1638: roff_nr(ROFF_ARGS)
1.83      schwarze 1639: {
1.121     schwarze 1640:        const char      *key;
                   1641:        char            *val;
1.138     kristaps 1642:        int              iv;
1.187     schwarze 1643:        char             sign;
1.89      kristaps 1644:
1.121     schwarze 1645:        val = *bufp + pos;
                   1646:        key = roff_getname(r, &val, ln, pos);
1.89      kristaps 1647:
1.187     schwarze 1648:        sign = *val;
                   1649:        if ('+' == sign || '-' == sign)
                   1650:                val++;
                   1651:
1.204   ! schwarze 1652:        if (roff_evalnum(val, NULL, &iv, 0))
        !          1653:                roff_setreg(r, key, iv, sign);
1.109     kristaps 1654:
1.203     schwarze 1655:        return(ROFF_IGN);
                   1656: }
                   1657:
                   1658: static enum rofferr
                   1659: roff_rr(ROFF_ARGS)
                   1660: {
                   1661:        struct roffreg  *reg, **prev;
                   1662:        const char      *name;
                   1663:        char            *cp;
                   1664:
                   1665:        cp = *bufp + pos;
                   1666:        name = roff_getname(r, &cp, ln, pos);
                   1667:
                   1668:        prev = &r->regtab;
                   1669:        while (1) {
                   1670:                reg = *prev;
                   1671:                if (NULL == reg || !strcmp(name, reg->key.p))
                   1672:                        break;
                   1673:                prev = &reg->next;
                   1674:        }
                   1675:        if (NULL != reg) {
                   1676:                *prev = reg->next;
                   1677:                free(reg->key.p);
                   1678:                free(reg);
                   1679:        }
1.122     schwarze 1680:        return(ROFF_IGN);
                   1681: }
                   1682:
                   1683: /* ARGSUSED */
                   1684: static enum rofferr
                   1685: roff_rm(ROFF_ARGS)
                   1686: {
                   1687:        const char       *name;
                   1688:        char             *cp;
                   1689:
                   1690:        cp = *bufp + pos;
                   1691:        while ('\0' != *cp) {
1.127     kristaps 1692:                name = roff_getname(r, &cp, ln, (int)(cp - *bufp));
1.122     schwarze 1693:                if ('\0' != *name)
                   1694:                        roff_setstr(r, name, NULL, 0);
                   1695:        }
1.178     schwarze 1696:        return(ROFF_IGN);
                   1697: }
                   1698:
                   1699: /* ARGSUSED */
                   1700: static enum rofferr
                   1701: roff_it(ROFF_ARGS)
                   1702: {
                   1703:        char            *cp;
                   1704:        size_t           len;
                   1705:        int              iv;
                   1706:
                   1707:        /* Parse the number of lines. */
                   1708:        cp = *bufp + pos;
                   1709:        len = strcspn(cp, " \t");
                   1710:        cp[len] = '\0';
                   1711:        if ((iv = mandoc_strntoi(cp, len, 10)) <= 0) {
                   1712:                mandoc_msg(MANDOCERR_NUMERIC, r->parse,
                   1713:                                ln, ppos, *bufp + 1);
                   1714:                return(ROFF_IGN);
                   1715:        }
                   1716:        cp += len + 1;
                   1717:
                   1718:        /* Arm the input line trap. */
                   1719:        roffit_lines = iv;
                   1720:        roffit_macro = mandoc_strdup(cp);
1.109     kristaps 1721:        return(ROFF_IGN);
1.175     schwarze 1722: }
                   1723:
                   1724: /* ARGSUSED */
                   1725: static enum rofferr
                   1726: roff_Dd(ROFF_ARGS)
                   1727: {
                   1728:        const char *const       *cp;
                   1729:
1.199     schwarze 1730:        if (0 == ((MPARSE_MDOC | MPARSE_QUICK) & r->options))
1.175     schwarze 1731:                for (cp = __mdoc_reserved; *cp; cp++)
                   1732:                        roff_setstr(r, *cp, NULL, 0);
                   1733:
                   1734:        return(ROFF_CONT);
                   1735: }
                   1736:
                   1737: /* ARGSUSED */
                   1738: static enum rofferr
                   1739: roff_TH(ROFF_ARGS)
                   1740: {
                   1741:        const char *const       *cp;
                   1742:
1.199     schwarze 1743:        if (0 == (MPARSE_QUICK & r->options))
1.175     schwarze 1744:                for (cp = __man_reserved; *cp; cp++)
                   1745:                        roff_setstr(r, *cp, NULL, 0);
                   1746:
                   1747:        return(ROFF_CONT);
1.109     kristaps 1748: }
                   1749:
                   1750: /* ARGSUSED */
                   1751: static enum rofferr
                   1752: roff_TE(ROFF_ARGS)
                   1753: {
                   1754:
                   1755:        if (NULL == r->tbl)
1.128     kristaps 1756:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.115     kristaps 1757:        else
1.151     kristaps 1758:                tbl_end(&r->tbl);
1.109     kristaps 1759:
1.112     kristaps 1760:        return(ROFF_IGN);
                   1761: }
                   1762:
                   1763: /* ARGSUSED */
                   1764: static enum rofferr
                   1765: roff_T_(ROFF_ARGS)
                   1766: {
                   1767:
                   1768:        if (NULL == r->tbl)
1.128     kristaps 1769:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.112     kristaps 1770:        else
1.116     kristaps 1771:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1772:
1.109     kristaps 1773:        return(ROFF_IGN);
                   1774: }
                   1775:
1.156     kristaps 1776: #if 0
                   1777: static int
1.151     kristaps 1778: roff_closeeqn(struct roff *r)
                   1779: {
                   1780:
                   1781:        return(r->eqn && ROFF_EQN == eqn_end(&r->eqn) ? 1 : 0);
                   1782: }
1.156     kristaps 1783: #endif
1.151     kristaps 1784:
1.156     kristaps 1785: static void
1.151     kristaps 1786: roff_openeqn(struct roff *r, const char *name, int line,
                   1787:                int offs, const char *buf)
1.125     kristaps 1788: {
1.151     kristaps 1789:        struct eqn_node *e;
                   1790:        int              poff;
1.125     kristaps 1791:
                   1792:        assert(NULL == r->eqn);
1.151     kristaps 1793:        e = eqn_alloc(name, offs, line, r->parse);
1.125     kristaps 1794:
                   1795:        if (r->last_eqn)
                   1796:                r->last_eqn->next = e;
                   1797:        else
                   1798:                r->first_eqn = r->last_eqn = e;
                   1799:
                   1800:        r->eqn = r->last_eqn = e;
1.151     kristaps 1801:
                   1802:        if (buf) {
                   1803:                poff = 0;
                   1804:                eqn_read(&r->eqn, line, buf, offs, &poff);
                   1805:        }
                   1806: }
                   1807:
                   1808: /* ARGSUSED */
                   1809: static enum rofferr
                   1810: roff_EQ(ROFF_ARGS)
                   1811: {
                   1812:
                   1813:        roff_openeqn(r, *bufp + pos, ln, ppos, NULL);
1.125     kristaps 1814:        return(ROFF_IGN);
                   1815: }
                   1816:
                   1817: /* ARGSUSED */
                   1818: static enum rofferr
                   1819: roff_EN(ROFF_ARGS)
                   1820: {
                   1821:
1.128     kristaps 1822:        mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.125     kristaps 1823:        return(ROFF_IGN);
                   1824: }
                   1825:
                   1826: /* ARGSUSED */
                   1827: static enum rofferr
1.109     kristaps 1828: roff_TS(ROFF_ARGS)
                   1829: {
1.176     schwarze 1830:        struct tbl_node *tbl;
1.89      kristaps 1831:
1.115     kristaps 1832:        if (r->tbl) {
1.128     kristaps 1833:                mandoc_msg(MANDOCERR_SCOPEBROKEN, r->parse, ln, ppos, NULL);
1.151     kristaps 1834:                tbl_end(&r->tbl);
1.115     kristaps 1835:        }
1.83      schwarze 1836:
1.176     schwarze 1837:        tbl = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 1838:
                   1839:        if (r->last_tbl)
1.176     schwarze 1840:                r->last_tbl->next = tbl;
1.113     kristaps 1841:        else
1.176     schwarze 1842:                r->first_tbl = r->last_tbl = tbl;
1.113     kristaps 1843:
1.176     schwarze 1844:        r->tbl = r->last_tbl = tbl;
1.83      schwarze 1845:        return(ROFF_IGN);
1.92      schwarze 1846: }
                   1847:
1.105     kristaps 1848: /* ARGSUSED */
                   1849: static enum rofferr
1.174     kristaps 1850: roff_cc(ROFF_ARGS)
                   1851: {
                   1852:        const char      *p;
                   1853:
                   1854:        p = *bufp + pos;
                   1855:
                   1856:        if ('\0' == *p || '.' == (r->control = *p++))
                   1857:                r->control = 0;
                   1858:
                   1859:        if ('\0' != *p)
                   1860:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1861:
                   1862:        return(ROFF_IGN);
                   1863: }
                   1864:
                   1865: /* ARGSUSED */
                   1866: static enum rofferr
1.164     kristaps 1867: roff_tr(ROFF_ARGS)
                   1868: {
                   1869:        const char      *p, *first, *second;
                   1870:        size_t           fsz, ssz;
                   1871:        enum mandoc_esc  esc;
                   1872:
                   1873:        p = *bufp + pos;
                   1874:
                   1875:        if ('\0' == *p) {
                   1876:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1877:                return(ROFF_IGN);
                   1878:        }
                   1879:
                   1880:        while ('\0' != *p) {
                   1881:                fsz = ssz = 1;
                   1882:
                   1883:                first = p++;
                   1884:                if ('\\' == *first) {
                   1885:                        esc = mandoc_escape(&p, NULL, NULL);
                   1886:                        if (ESCAPE_ERROR == esc) {
                   1887:                                mandoc_msg
                   1888:                                        (MANDOCERR_BADESCAPE, r->parse,
                   1889:                                         ln, (int)(p - *bufp), NULL);
                   1890:                                return(ROFF_IGN);
                   1891:                        }
                   1892:                        fsz = (size_t)(p - first);
                   1893:                }
                   1894:
                   1895:                second = p++;
                   1896:                if ('\\' == *second) {
                   1897:                        esc = mandoc_escape(&p, NULL, NULL);
                   1898:                        if (ESCAPE_ERROR == esc) {
                   1899:                                mandoc_msg
                   1900:                                        (MANDOCERR_BADESCAPE, r->parse,
                   1901:                                         ln, (int)(p - *bufp), NULL);
                   1902:                                return(ROFF_IGN);
                   1903:                        }
                   1904:                        ssz = (size_t)(p - second);
1.165     kristaps 1905:                } else if ('\0' == *second) {
1.164     kristaps 1906:                        mandoc_msg(MANDOCERR_ARGCOUNT, r->parse,
                   1907:                                        ln, (int)(p - *bufp), NULL);
                   1908:                        second = " ";
1.165     kristaps 1909:                        p--;
1.164     kristaps 1910:                }
                   1911:
1.167     kristaps 1912:                if (fsz > 1) {
                   1913:                        roff_setstrn(&r->xmbtab, first,
                   1914:                                        fsz, second, ssz, 0);
                   1915:                        continue;
                   1916:                }
                   1917:
                   1918:                if (NULL == r->xtab)
                   1919:                        r->xtab = mandoc_calloc
                   1920:                                (128, sizeof(struct roffstr));
                   1921:
                   1922:                free(r->xtab[(int)*first].p);
                   1923:                r->xtab[(int)*first].p = mandoc_strndup(second, ssz);
                   1924:                r->xtab[(int)*first].sz = ssz;
1.164     kristaps 1925:        }
                   1926:
                   1927:        return(ROFF_IGN);
                   1928: }
                   1929:
                   1930: /* ARGSUSED */
                   1931: static enum rofferr
1.105     kristaps 1932: roff_so(ROFF_ARGS)
                   1933: {
                   1934:        char *name;
                   1935:
1.128     kristaps 1936:        mandoc_msg(MANDOCERR_SO, r->parse, ln, ppos, NULL);
1.105     kristaps 1937:
                   1938:        /*
                   1939:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   1940:         * opening anything that's not in our cwd or anything beneath
                   1941:         * it.  Thus, explicitly disallow traversing up the file-system
                   1942:         * or using absolute paths.
                   1943:         */
                   1944:
                   1945:        name = *bufp + pos;
                   1946:        if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
1.128     kristaps 1947:                mandoc_msg(MANDOCERR_SOPATH, r->parse, ln, pos, NULL);
1.105     kristaps 1948:                return(ROFF_ERR);
                   1949:        }
                   1950:
                   1951:        *offs = pos;
                   1952:        return(ROFF_SO);
                   1953: }
1.92      schwarze 1954:
1.106     kristaps 1955: /* ARGSUSED */
                   1956: static enum rofferr
                   1957: roff_userdef(ROFF_ARGS)
1.99      kristaps 1958: {
1.106     kristaps 1959:        const char       *arg[9];
                   1960:        char             *cp, *n1, *n2;
1.119     schwarze 1961:        int               i;
1.106     kristaps 1962:
                   1963:        /*
                   1964:         * Collect pointers to macro argument strings
1.188     schwarze 1965:         * and NUL-terminate them.
1.106     kristaps 1966:         */
                   1967:        cp = *bufp + pos;
1.119     schwarze 1968:        for (i = 0; i < 9; i++)
1.120     schwarze 1969:                arg[i] = '\0' == *cp ? "" :
1.136     kristaps 1970:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 1971:
1.106     kristaps 1972:        /*
                   1973:         * Expand macro arguments.
1.99      kristaps 1974:         */
1.106     kristaps 1975:        *szp = 0;
                   1976:        n1 = cp = mandoc_strdup(r->current_string);
                   1977:        while (NULL != (cp = strstr(cp, "\\$"))) {
                   1978:                i = cp[2] - '1';
                   1979:                if (0 > i || 8 < i) {
                   1980:                        /* Not an argument invocation. */
                   1981:                        cp += 2;
                   1982:                        continue;
                   1983:                }
                   1984:
                   1985:                *szp = strlen(n1) - 3 + strlen(arg[i]) + 1;
                   1986:                n2 = mandoc_malloc(*szp);
                   1987:
                   1988:                strlcpy(n2, n1, (size_t)(cp - n1 + 1));
                   1989:                strlcat(n2, arg[i], *szp);
                   1990:                strlcat(n2, cp + 3, *szp);
                   1991:
                   1992:                cp = n2 + (cp - n1);
                   1993:                free(n1);
                   1994:                n1 = n2;
1.99      kristaps 1995:        }
                   1996:
1.106     kristaps 1997:        /*
                   1998:         * Replace the macro invocation
                   1999:         * by the expanded macro.
                   2000:         */
                   2001:        free(*bufp);
                   2002:        *bufp = n1;
                   2003:        if (0 == *szp)
                   2004:                *szp = strlen(*bufp) + 1;
                   2005:
                   2006:        return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
                   2007:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 2008: }
1.121     schwarze 2009:
                   2010: static char *
                   2011: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   2012: {
                   2013:        char     *name, *cp;
                   2014:
                   2015:        name = *cpp;
                   2016:        if ('\0' == *name)
                   2017:                return(name);
                   2018:
                   2019:        /* Read until end of name. */
                   2020:        for (cp = name; '\0' != *cp && ' ' != *cp; cp++) {
                   2021:                if ('\\' != *cp)
                   2022:                        continue;
                   2023:                cp++;
                   2024:                if ('\\' == *cp)
                   2025:                        continue;
1.128     kristaps 2026:                mandoc_msg(MANDOCERR_NAMESC, r->parse, ln, pos, NULL);
1.121     schwarze 2027:                *cp = '\0';
                   2028:                name = cp;
                   2029:        }
                   2030:
                   2031:        /* Nil-terminate name. */
                   2032:        if ('\0' != *cp)
                   2033:                *(cp++) = '\0';
                   2034:
                   2035:        /* Read past spaces. */
                   2036:        while (' ' == *cp)
                   2037:                cp++;
                   2038:
                   2039:        *cpp = cp;
                   2040:        return(name);
                   2041: }
                   2042:
1.106     kristaps 2043: /*
                   2044:  * Store *string into the user-defined string called *name.
                   2045:  * To clear an existing entry, call with (*r, *name, NULL, 0).
1.193     schwarze 2046:  * append == 0: replace mode
                   2047:  * append == 1: single-line append mode
                   2048:  * append == 2: multiline append mode, append '\n' after each call
1.106     kristaps 2049:  */
1.94      kristaps 2050: static void
1.106     kristaps 2051: roff_setstr(struct roff *r, const char *name, const char *string,
1.193     schwarze 2052:        int append)
1.92      schwarze 2053: {
1.164     kristaps 2054:
                   2055:        roff_setstrn(&r->strtab, name, strlen(name), string,
1.193     schwarze 2056:                        string ? strlen(string) : 0, append);
1.164     kristaps 2057: }
                   2058:
                   2059: static void
1.166     kristaps 2060: roff_setstrn(struct roffkv **r, const char *name, size_t namesz,
1.193     schwarze 2061:                const char *string, size_t stringsz, int append)
1.164     kristaps 2062: {
1.166     kristaps 2063:        struct roffkv   *n;
1.164     kristaps 2064:        char            *c;
                   2065:        int              i;
                   2066:        size_t           oldch, newch;
1.92      schwarze 2067:
1.106     kristaps 2068:        /* Search for an existing string with the same name. */
1.164     kristaps 2069:        n = *r;
                   2070:
1.166     kristaps 2071:        while (n && strcmp(name, n->key.p))
1.92      schwarze 2072:                n = n->next;
1.94      kristaps 2073:
                   2074:        if (NULL == n) {
1.106     kristaps 2075:                /* Create a new string table entry. */
1.166     kristaps 2076:                n = mandoc_malloc(sizeof(struct roffkv));
                   2077:                n->key.p = mandoc_strndup(name, namesz);
                   2078:                n->key.sz = namesz;
                   2079:                n->val.p = NULL;
                   2080:                n->val.sz = 0;
1.164     kristaps 2081:                n->next = *r;
                   2082:                *r = n;
1.193     schwarze 2083:        } else if (0 == append) {
1.166     kristaps 2084:                free(n->val.p);
                   2085:                n->val.p = NULL;
                   2086:                n->val.sz = 0;
1.106     kristaps 2087:        }
                   2088:
                   2089:        if (NULL == string)
                   2090:                return;
                   2091:
                   2092:        /*
                   2093:         * One additional byte for the '\n' in multiline mode,
                   2094:         * and one for the terminating '\0'.
                   2095:         */
1.193     schwarze 2096:        newch = stringsz + (1 < append ? 2u : 1u);
1.164     kristaps 2097:
1.166     kristaps 2098:        if (NULL == n->val.p) {
                   2099:                n->val.p = mandoc_malloc(newch);
                   2100:                *n->val.p = '\0';
1.106     kristaps 2101:                oldch = 0;
                   2102:        } else {
1.166     kristaps 2103:                oldch = n->val.sz;
                   2104:                n->val.p = mandoc_realloc(n->val.p, oldch + newch);
1.106     kristaps 2105:        }
                   2106:
                   2107:        /* Skip existing content in the destination buffer. */
1.166     kristaps 2108:        c = n->val.p + (int)oldch;
1.106     kristaps 2109:
                   2110:        /* Append new content to the destination buffer. */
1.164     kristaps 2111:        i = 0;
                   2112:        while (i < (int)stringsz) {
1.106     kristaps 2113:                /*
                   2114:                 * Rudimentary roff copy mode:
                   2115:                 * Handle escaped backslashes.
                   2116:                 */
1.164     kristaps 2117:                if ('\\' == string[i] && '\\' == string[i + 1])
                   2118:                        i++;
                   2119:                *c++ = string[i++];
1.106     kristaps 2120:        }
1.94      kristaps 2121:
1.106     kristaps 2122:        /* Append terminating bytes. */
1.193     schwarze 2123:        if (1 < append)
1.106     kristaps 2124:                *c++ = '\n';
1.163     kristaps 2125:
1.106     kristaps 2126:        *c = '\0';
1.166     kristaps 2127:        n->val.sz = (int)(c - n->val.p);
1.92      schwarze 2128: }
                   2129:
1.94      kristaps 2130: static const char *
                   2131: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 2132: {
1.166     kristaps 2133:        const struct roffkv *n;
1.191     schwarze 2134:        int i;
1.92      schwarze 2135:
1.164     kristaps 2136:        for (n = r->strtab; n; n = n->next)
1.166     kristaps 2137:                if (0 == strncmp(name, n->key.p, len) &&
                   2138:                                '\0' == n->key.p[(int)len])
                   2139:                        return(n->val.p);
1.191     schwarze 2140:
                   2141:        for (i = 0; i < PREDEFS_MAX; i++)
                   2142:                if (0 == strncmp(name, predefs[i].name, len) &&
                   2143:                                '\0' == predefs[i].name[(int)len])
                   2144:                        return(predefs[i].str);
1.94      kristaps 2145:
1.157     kristaps 2146:        return(NULL);
1.92      schwarze 2147: }
                   2148:
1.94      kristaps 2149: static void
1.167     kristaps 2150: roff_freestr(struct roffkv *r)
1.92      schwarze 2151: {
1.166     kristaps 2152:        struct roffkv    *n, *nn;
1.92      schwarze 2153:
1.167     kristaps 2154:        for (n = r; n; n = nn) {
1.166     kristaps 2155:                free(n->key.p);
                   2156:                free(n->val.p);
1.92      schwarze 2157:                nn = n->next;
                   2158:                free(n);
                   2159:        }
1.114     kristaps 2160: }
                   2161:
                   2162: const struct tbl_span *
                   2163: roff_span(const struct roff *r)
                   2164: {
                   2165:
                   2166:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 2167: }
                   2168:
                   2169: const struct eqn *
                   2170: roff_eqn(const struct roff *r)
                   2171: {
                   2172:
                   2173:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.164     kristaps 2174: }
                   2175:
                   2176: /*
                   2177:  * Duplicate an input string, making the appropriate character
                   2178:  * conversations (as stipulated by `tr') along the way.
                   2179:  * Returns a heap-allocated string with all the replacements made.
                   2180:  */
                   2181: char *
                   2182: roff_strdup(const struct roff *r, const char *p)
                   2183: {
1.166     kristaps 2184:        const struct roffkv *cp;
1.164     kristaps 2185:        char            *res;
                   2186:        const char      *pp;
                   2187:        size_t           ssz, sz;
                   2188:        enum mandoc_esc  esc;
                   2189:
1.167     kristaps 2190:        if (NULL == r->xmbtab && NULL == r->xtab)
1.164     kristaps 2191:                return(mandoc_strdup(p));
                   2192:        else if ('\0' == *p)
                   2193:                return(mandoc_strdup(""));
                   2194:
                   2195:        /*
                   2196:         * Step through each character looking for term matches
                   2197:         * (remember that a `tr' can be invoked with an escape, which is
                   2198:         * a glyph but the escape is multi-character).
                   2199:         * We only do this if the character hash has been initialised
                   2200:         * and the string is >0 length.
                   2201:         */
                   2202:
                   2203:        res = NULL;
                   2204:        ssz = 0;
                   2205:
                   2206:        while ('\0' != *p) {
1.167     kristaps 2207:                if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) {
                   2208:                        sz = r->xtab[(int)*p].sz;
                   2209:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2210:                        memcpy(res + ssz, r->xtab[(int)*p].p, sz);
                   2211:                        ssz += sz;
                   2212:                        p++;
                   2213:                        continue;
                   2214:                } else if ('\\' != *p) {
                   2215:                        res = mandoc_realloc(res, ssz + 2);
                   2216:                        res[ssz++] = *p++;
                   2217:                        continue;
                   2218:                }
                   2219:
1.164     kristaps 2220:                /* Search for term matches. */
1.167     kristaps 2221:                for (cp = r->xmbtab; cp; cp = cp->next)
1.166     kristaps 2222:                        if (0 == strncmp(p, cp->key.p, cp->key.sz))
1.164     kristaps 2223:                                break;
                   2224:
                   2225:                if (NULL != cp) {
                   2226:                        /*
                   2227:                         * A match has been found.
                   2228:                         * Append the match to the array and move
                   2229:                         * forward by its keysize.
                   2230:                         */
1.166     kristaps 2231:                        res = mandoc_realloc
                   2232:                                (res, ssz + cp->val.sz + 1);
                   2233:                        memcpy(res + ssz, cp->val.p, cp->val.sz);
                   2234:                        ssz += cp->val.sz;
                   2235:                        p += (int)cp->key.sz;
1.164     kristaps 2236:                        continue;
                   2237:                }
                   2238:
1.167     kristaps 2239:                /*
                   2240:                 * Handle escapes carefully: we need to copy
                   2241:                 * over just the escape itself, or else we might
                   2242:                 * do replacements within the escape itself.
                   2243:                 * Make sure to pass along the bogus string.
                   2244:                 */
                   2245:                pp = p++;
                   2246:                esc = mandoc_escape(&p, NULL, NULL);
                   2247:                if (ESCAPE_ERROR == esc) {
                   2248:                        sz = strlen(pp);
1.164     kristaps 2249:                        res = mandoc_realloc(res, ssz + sz + 1);
                   2250:                        memcpy(res + ssz, pp, sz);
1.167     kristaps 2251:                        break;
1.164     kristaps 2252:                }
1.167     kristaps 2253:                /*
                   2254:                 * We bail out on bad escapes.
                   2255:                 * No need to warn: we already did so when
                   2256:                 * roff_res() was called.
                   2257:                 */
                   2258:                sz = (int)(p - pp);
                   2259:                res = mandoc_realloc(res, ssz + sz + 1);
                   2260:                memcpy(res + ssz, pp, sz);
                   2261:                ssz += sz;
1.164     kristaps 2262:        }
                   2263:
                   2264:        res[(int)ssz] = '\0';
                   2265:        return(res);
1.174     kristaps 2266: }
                   2267:
                   2268: /*
                   2269:  * Find out whether a line is a macro line or not.
                   2270:  * If it is, adjust the current position and return one; if it isn't,
                   2271:  * return zero and don't change the current position.
                   2272:  * If the control character has been set with `.cc', then let that grain
                   2273:  * precedence.
                   2274:  * This is slighly contrary to groff, where using the non-breaking
                   2275:  * control character when `cc' has been invoked will cause the
                   2276:  * non-breaking macro contents to be printed verbatim.
                   2277:  */
                   2278: int
                   2279: roff_getcontrol(const struct roff *r, const char *cp, int *ppos)
                   2280: {
                   2281:        int             pos;
                   2282:
                   2283:        pos = *ppos;
                   2284:
                   2285:        if (0 != r->control && cp[pos] == r->control)
                   2286:                pos++;
                   2287:        else if (0 != r->control)
                   2288:                return(0);
                   2289:        else if ('\\' == cp[pos] && '.' == cp[pos + 1])
                   2290:                pos += 2;
                   2291:        else if ('.' == cp[pos] || '\'' == cp[pos])
                   2292:                pos++;
                   2293:        else
                   2294:                return(0);
                   2295:
                   2296:        while (' ' == cp[pos] || '\t' == cp[pos])
                   2297:                pos++;
                   2298:
                   2299:        *ppos = pos;
                   2300:        return(1);
1.74      kristaps 2301: }

CVSweb