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Annotation of mandoc/roff.c, Revision 1.172

1.172   ! schwarze    1: /*     $Id: roff.c,v 1.171 2011/09/19 08:34:45 schwarze Exp $ */
1.1       kristaps    2: /*
1.119     schwarze    3:  * Copyright (c) 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
                      4:  * Copyright (c) 2010, 2011 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>
1.1       kristaps   24: #include <stdlib.h>
1.67      kristaps   25: #include <string.h>
1.1       kristaps   26:
1.67      kristaps   27: #include "mandoc.h"
1.109     kristaps   28: #include "libroff.h"
1.94      kristaps   29: #include "libmandoc.h"
1.33      kristaps   30:
1.141     kristaps   31: /* Maximum number of nested if-else conditionals. */
1.82      kristaps   32: #define        RSTACK_MAX      128
                     33:
1.170     schwarze   34: /* Maximum number of string expansions per line, to break infinite loops. */
                     35: #define        EXPAND_LIMIT    1000
                     36:
1.67      kristaps   37: enum   rofft {
1.103     kristaps   38:        ROFF_ad,
1.80      kristaps   39:        ROFF_am,
                     40:        ROFF_ami,
                     41:        ROFF_am1,
                     42:        ROFF_de,
                     43:        ROFF_dei,
                     44:        ROFF_de1,
1.83      schwarze   45:        ROFF_ds,
1.82      kristaps   46:        ROFF_el,
1.103     kristaps   47:        ROFF_hy,
1.82      kristaps   48:        ROFF_ie,
1.75      kristaps   49:        ROFF_if,
1.76      kristaps   50:        ROFF_ig,
1.123     schwarze   51:        ROFF_it,
1.103     kristaps   52:        ROFF_ne,
                     53:        ROFF_nh,
1.104     kristaps   54:        ROFF_nr,
1.124     schwarze   55:        ROFF_ns,
                     56:        ROFF_ps,
1.83      schwarze   57:        ROFF_rm,
1.105     kristaps   58:        ROFF_so,
1.124     schwarze   59:        ROFF_ta,
1.83      schwarze   60:        ROFF_tr,
1.109     kristaps   61:        ROFF_TS,
                     62:        ROFF_TE,
1.112     kristaps   63:        ROFF_T_,
1.125     kristaps   64:        ROFF_EQ,
                     65:        ROFF_EN,
1.76      kristaps   66:        ROFF_cblock,
1.141     kristaps   67:        ROFF_ccond,
1.106     kristaps   68:        ROFF_USERDEF,
1.67      kristaps   69:        ROFF_MAX
                     70: };
                     71:
1.82      kristaps   72: enum   roffrule {
                     73:        ROFFRULE_ALLOW,
                     74:        ROFFRULE_DENY
                     75: };
                     76:
1.147     kristaps   77: /*
                     78:  * A single register entity.  If "set" is zero, the value of the
                     79:  * register should be the default one, which is per-register.
                     80:  * Registers are assumed to be unsigned ints for now.
                     81:  */
                     82: struct reg {
1.166     kristaps   83:        int              set; /* whether set or not */
                     84:        unsigned int     u; /* unsigned integer */
1.147     kristaps   85: };
                     86:
1.167     kristaps   87: /*
                     88:  * An incredibly-simple string buffer.
                     89:  */
1.94      kristaps   90: struct roffstr {
1.167     kristaps   91:        char            *p; /* nil-terminated buffer */
                     92:        size_t           sz; /* saved strlen(p) */
1.166     kristaps   93: };
                     94:
                     95: /*
1.167     kristaps   96:  * A key-value roffstr pair as part of a singly-linked list.
1.166     kristaps   97:  */
                     98: struct roffkv {
                     99:        struct roffstr   key;
                    100:        struct roffstr   val;
                    101:        struct roffkv   *next; /* next in list */
1.94      kristaps  102: };
                    103:
1.67      kristaps  104: struct roff {
1.128     kristaps  105:        struct mparse   *parse; /* parse point */
1.67      kristaps  106:        struct roffnode *last; /* leaf of stack */
1.82      kristaps  107:        enum roffrule    rstack[RSTACK_MAX]; /* stack of !`ie' rules */
                    108:        int              rstackpos; /* position in rstack */
1.147     kristaps  109:        struct reg       regs[REG__MAX];
1.166     kristaps  110:        struct roffkv   *strtab; /* user-defined strings & macros */
1.167     kristaps  111:        struct roffkv   *xmbtab; /* multi-byte trans table (`tr') */
                    112:        struct roffstr  *xtab; /* single-byte trans table (`tr') */
1.106     kristaps  113:        const char      *current_string; /* value of last called user macro */
1.118     kristaps  114:        struct tbl_node *first_tbl; /* first table parsed */
                    115:        struct tbl_node *last_tbl; /* last table parsed */
                    116:        struct tbl_node *tbl; /* current table being parsed */
1.125     kristaps  117:        struct eqn_node *last_eqn; /* last equation parsed */
                    118:        struct eqn_node *first_eqn; /* first equation parsed */
                    119:        struct eqn_node *eqn; /* current equation being parsed */
1.79      kristaps  120: };
                    121:
1.67      kristaps  122: struct roffnode {
                    123:        enum rofft       tok; /* type of node */
                    124:        struct roffnode *parent; /* up one in stack */
                    125:        int              line; /* parse line */
                    126:        int              col; /* parse col */
1.106     kristaps  127:        char            *name; /* node name, e.g. macro name */
1.79      kristaps  128:        char            *end; /* end-rules: custom token */
                    129:        int              endspan; /* end-rules: next-line or infty */
1.82      kristaps  130:        enum roffrule    rule; /* current evaluation rule */
1.67      kristaps  131: };
                    132:
                    133: #define        ROFF_ARGS        struct roff *r, /* parse ctx */ \
1.72      kristaps  134:                         enum rofft tok, /* tok of macro */ \
1.67      kristaps  135:                         char **bufp, /* input buffer */ \
                    136:                         size_t *szp, /* size of input buffer */ \
                    137:                         int ln, /* parse line */ \
1.75      kristaps  138:                         int ppos, /* original pos in buffer */ \
                    139:                         int pos, /* current pos in buffer */ \
1.74      kristaps  140:                         int *offs /* reset offset of buffer data */
1.67      kristaps  141:
                    142: typedef        enum rofferr (*roffproc)(ROFF_ARGS);
                    143:
                    144: struct roffmac {
                    145:        const char      *name; /* macro name */
1.79      kristaps  146:        roffproc         proc; /* process new macro */
                    147:        roffproc         text; /* process as child text of macro */
                    148:        roffproc         sub; /* process as child of macro */
                    149:        int              flags;
                    150: #define        ROFFMAC_STRUCT  (1 << 0) /* always interpret */
1.85      kristaps  151:        struct roffmac  *next;
1.67      kristaps  152: };
                    153:
1.141     kristaps  154: struct predef {
                    155:        const char      *name; /* predefined input name */
                    156:        const char      *str; /* replacement symbol */
                    157: };
                    158:
                    159: #define        PREDEF(__name, __str) \
                    160:        { (__name), (__str) },
                    161:
1.155     kristaps  162: static enum rofft       roffhash_find(const char *, size_t);
                    163: static void             roffhash_init(void);
                    164: static void             roffnode_cleanscope(struct roff *);
                    165: static void             roffnode_pop(struct roff *);
                    166: static void             roffnode_push(struct roff *, enum rofft,
                    167:                                const char *, int, int);
1.80      kristaps  168: static enum rofferr     roff_block(ROFF_ARGS);
                    169: static enum rofferr     roff_block_text(ROFF_ARGS);
                    170: static enum rofferr     roff_block_sub(ROFF_ARGS);
                    171: static enum rofferr     roff_cblock(ROFF_ARGS);
                    172: static enum rofferr     roff_ccond(ROFF_ARGS);
1.82      kristaps  173: static enum rofferr     roff_cond(ROFF_ARGS);
                    174: static enum rofferr     roff_cond_text(ROFF_ARGS);
                    175: static enum rofferr     roff_cond_sub(ROFF_ARGS);
1.92      schwarze  176: static enum rofferr     roff_ds(ROFF_ARGS);
1.94      kristaps  177: static enum roffrule    roff_evalcond(const char *, int *);
1.155     kristaps  178: static void             roff_free1(struct roff *);
1.167     kristaps  179: static void             roff_freestr(struct roffkv *);
1.121     schwarze  180: static char            *roff_getname(struct roff *, char **, int, int);
1.94      kristaps  181: static const char      *roff_getstrn(const struct roff *,
                    182:                                const char *, size_t);
1.103     kristaps  183: static enum rofferr     roff_line_ignore(ROFF_ARGS);
1.89      kristaps  184: static enum rofferr     roff_nr(ROFF_ARGS);
1.169     schwarze  185: static void             roff_openeqn(struct roff *, const char *,
1.156     kristaps  186:                                int, int, const char *);
1.155     kristaps  187: static enum rofft       roff_parse(struct roff *, const char *, int *);
                    188: static enum rofferr     roff_parsetext(char *);
1.172   ! schwarze  189: static enum rofferr     roff_res(struct roff *,
1.142     kristaps  190:                                char **, size_t *, int, int);
1.122     schwarze  191: static enum rofferr     roff_rm(ROFF_ARGS);
1.94      kristaps  192: static void             roff_setstr(struct roff *,
1.106     kristaps  193:                                const char *, const char *, int);
1.166     kristaps  194: static void             roff_setstrn(struct roffkv **, const char *,
1.164     kristaps  195:                                size_t, const char *, size_t, int);
1.105     kristaps  196: static enum rofferr     roff_so(ROFF_ARGS);
1.164     kristaps  197: static enum rofferr     roff_tr(ROFF_ARGS);
1.109     kristaps  198: static enum rofferr     roff_TE(ROFF_ARGS);
                    199: static enum rofferr     roff_TS(ROFF_ARGS);
1.125     kristaps  200: static enum rofferr     roff_EQ(ROFF_ARGS);
                    201: static enum rofferr     roff_EN(ROFF_ARGS);
1.112     kristaps  202: static enum rofferr     roff_T_(ROFF_ARGS);
1.106     kristaps  203: static enum rofferr     roff_userdef(ROFF_ARGS);
1.67      kristaps  204:
1.155     kristaps  205: /* See roffhash_find() */
1.85      kristaps  206:
                    207: #define        ASCII_HI         126
                    208: #define        ASCII_LO         33
                    209: #define        HASHWIDTH       (ASCII_HI - ASCII_LO + 1)
                    210:
                    211: static struct roffmac  *hash[HASHWIDTH];
                    212:
                    213: static struct roffmac   roffs[ROFF_MAX] = {
1.103     kristaps  214:        { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  215:        { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    216:        { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    217:        { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    218:        { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    219:        { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
                    220:        { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92      schwarze  221:        { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85      kristaps  222:        { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.103     kristaps  223:        { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85      kristaps  224:        { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    225:        { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
                    226:        { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.123     schwarze  227:        { "it", roff_line_ignore, NULL, NULL, 0, NULL },
1.103     kristaps  228:        { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
                    229:        { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104     kristaps  230:        { "nr", roff_nr, NULL, NULL, 0, NULL },
1.124     schwarze  231:        { "ns", roff_line_ignore, NULL, NULL, 0, NULL },
                    232:        { "ps", roff_line_ignore, NULL, NULL, 0, NULL },
1.122     schwarze  233:        { "rm", roff_rm, NULL, NULL, 0, NULL },
1.105     kristaps  234:        { "so", roff_so, NULL, NULL, 0, NULL },
1.124     schwarze  235:        { "ta", roff_line_ignore, NULL, NULL, 0, NULL },
1.164     kristaps  236:        { "tr", roff_tr, NULL, NULL, 0, NULL },
1.109     kristaps  237:        { "TS", roff_TS, NULL, NULL, 0, NULL },
                    238:        { "TE", roff_TE, NULL, NULL, 0, NULL },
1.112     kristaps  239:        { "T&", roff_T_, NULL, NULL, 0, NULL },
1.125     kristaps  240:        { "EQ", roff_EQ, NULL, NULL, 0, NULL },
                    241:        { "EN", roff_EN, NULL, NULL, 0, NULL },
1.85      kristaps  242:        { ".", roff_cblock, NULL, NULL, 0, NULL },
                    243:        { "\\}", roff_ccond, NULL, NULL, 0, NULL },
1.106     kristaps  244:        { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67      kristaps  245: };
                    246:
1.141     kristaps  247: /* Array of injected predefined strings. */
                    248: #define        PREDEFS_MAX      38
                    249: static const struct predef predefs[PREDEFS_MAX] = {
                    250: #include "predefs.in"
                    251: };
                    252:
1.155     kristaps  253: /* See roffhash_find() */
1.85      kristaps  254: #define        ROFF_HASH(p)    (p[0] - ASCII_LO)
                    255:
                    256: static void
1.155     kristaps  257: roffhash_init(void)
1.85      kristaps  258: {
                    259:        struct roffmac   *n;
                    260:        int               buc, i;
                    261:
1.106     kristaps  262:        for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85      kristaps  263:                assert(roffs[i].name[0] >= ASCII_LO);
                    264:                assert(roffs[i].name[0] <= ASCII_HI);
                    265:
                    266:                buc = ROFF_HASH(roffs[i].name);
                    267:
                    268:                if (NULL != (n = hash[buc])) {
                    269:                        for ( ; n->next; n = n->next)
                    270:                                /* Do nothing. */ ;
                    271:                        n->next = &roffs[i];
                    272:                } else
                    273:                        hash[buc] = &roffs[i];
                    274:        }
                    275: }
                    276:
1.67      kristaps  277: /*
                    278:  * Look up a roff token by its name.  Returns ROFF_MAX if no macro by
                    279:  * the nil-terminated string name could be found.
                    280:  */
                    281: static enum rofft
1.155     kristaps  282: roffhash_find(const char *p, size_t s)
1.67      kristaps  283: {
1.85      kristaps  284:        int              buc;
                    285:        struct roffmac  *n;
1.67      kristaps  286:
1.85      kristaps  287:        /*
                    288:         * libroff has an extremely simple hashtable, for the time
                    289:         * being, which simply keys on the first character, which must
                    290:         * be printable, then walks a chain.  It works well enough until
                    291:         * optimised.
                    292:         */
                    293:
                    294:        if (p[0] < ASCII_LO || p[0] > ASCII_HI)
                    295:                return(ROFF_MAX);
                    296:
                    297:        buc = ROFF_HASH(p);
                    298:
                    299:        if (NULL == (n = hash[buc]))
                    300:                return(ROFF_MAX);
                    301:        for ( ; n; n = n->next)
1.106     kristaps  302:                if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85      kristaps  303:                        return((enum rofft)(n - roffs));
1.67      kristaps  304:
                    305:        return(ROFF_MAX);
                    306: }
                    307:
                    308:
                    309: /*
                    310:  * Pop the current node off of the stack of roff instructions currently
                    311:  * pending.
                    312:  */
                    313: static void
                    314: roffnode_pop(struct roff *r)
                    315: {
                    316:        struct roffnode *p;
                    317:
1.75      kristaps  318:        assert(r->last);
                    319:        p = r->last;
1.82      kristaps  320:
1.75      kristaps  321:        r->last = r->last->parent;
1.106     kristaps  322:        free(p->name);
                    323:        free(p->end);
1.67      kristaps  324:        free(p);
                    325: }
                    326:
                    327:
                    328: /*
                    329:  * Push a roff node onto the instruction stack.  This must later be
                    330:  * removed with roffnode_pop().
                    331:  */
1.98      schwarze  332: static void
1.106     kristaps  333: roffnode_push(struct roff *r, enum rofft tok, const char *name,
                    334:                int line, int col)
1.67      kristaps  335: {
                    336:        struct roffnode *p;
                    337:
1.98      schwarze  338:        p = mandoc_calloc(1, sizeof(struct roffnode));
1.67      kristaps  339:        p->tok = tok;
1.106     kristaps  340:        if (name)
                    341:                p->name = mandoc_strdup(name);
1.67      kristaps  342:        p->parent = r->last;
                    343:        p->line = line;
                    344:        p->col = col;
1.79      kristaps  345:        p->rule = p->parent ? p->parent->rule : ROFFRULE_DENY;
1.67      kristaps  346:
                    347:        r->last = p;
                    348: }
                    349:
                    350:
                    351: static void
                    352: roff_free1(struct roff *r)
                    353: {
1.118     kristaps  354:        struct tbl_node *t;
1.125     kristaps  355:        struct eqn_node *e;
1.167     kristaps  356:        int              i;
1.67      kristaps  357:
1.125     kristaps  358:        while (NULL != (t = r->first_tbl)) {
1.113     kristaps  359:                r->first_tbl = t->next;
                    360:                tbl_free(t);
1.109     kristaps  361:        }
                    362:
1.113     kristaps  363:        r->first_tbl = r->last_tbl = r->tbl = NULL;
                    364:
1.125     kristaps  365:        while (NULL != (e = r->first_eqn)) {
                    366:                r->first_eqn = e->next;
                    367:                eqn_free(e);
                    368:        }
                    369:
                    370:        r->first_eqn = r->last_eqn = r->eqn = NULL;
                    371:
1.67      kristaps  372:        while (r->last)
                    373:                roffnode_pop(r);
1.109     kristaps  374:
1.167     kristaps  375:        roff_freestr(r->strtab);
                    376:        roff_freestr(r->xmbtab);
                    377:
                    378:        r->strtab = r->xmbtab = NULL;
                    379:
                    380:        if (r->xtab)
                    381:                for (i = 0; i < 128; i++)
                    382:                        free(r->xtab[i].p);
                    383:
                    384:        free(r->xtab);
                    385:        r->xtab = NULL;
1.67      kristaps  386: }
                    387:
                    388: void
                    389: roff_reset(struct roff *r)
                    390: {
1.143     kristaps  391:        int              i;
1.67      kristaps  392:
                    393:        roff_free1(r);
1.143     kristaps  394:
1.147     kristaps  395:        memset(&r->regs, 0, sizeof(struct reg) * REG__MAX);
                    396:
1.143     kristaps  397:        for (i = 0; i < PREDEFS_MAX; i++)
                    398:                roff_setstr(r, predefs[i].name, predefs[i].str, 0);
1.67      kristaps  399: }
                    400:
                    401:
                    402: void
                    403: roff_free(struct roff *r)
                    404: {
                    405:
                    406:        roff_free1(r);
                    407:        free(r);
                    408: }
                    409:
                    410:
                    411: struct roff *
1.147     kristaps  412: roff_alloc(struct mparse *parse)
1.67      kristaps  413: {
                    414:        struct roff     *r;
1.141     kristaps  415:        int              i;
1.67      kristaps  416:
1.98      schwarze  417:        r = mandoc_calloc(1, sizeof(struct roff));
1.128     kristaps  418:        r->parse = parse;
1.82      kristaps  419:        r->rstackpos = -1;
1.85      kristaps  420:
1.155     kristaps  421:        roffhash_init();
1.141     kristaps  422:
                    423:        for (i = 0; i < PREDEFS_MAX; i++)
                    424:                roff_setstr(r, predefs[i].name, predefs[i].str, 0);
                    425:
1.67      kristaps  426:        return(r);
                    427: }
                    428:
1.94      kristaps  429: /*
                    430:  * Pre-filter each and every line for reserved words (one beginning with
                    431:  * `\*', e.g., `\*(ab').  These must be handled before the actual line
                    432:  * is processed.
1.153     kristaps  433:  * This also checks the syntax of regular escapes.
1.154     kristaps  434:  */
1.172   ! schwarze  435: static enum rofferr
1.142     kristaps  436: roff_res(struct roff *r, char **bufp, size_t *szp, int ln, int pos)
1.94      kristaps  437: {
1.152     kristaps  438:        enum mandoc_esc  esc;
1.108     schwarze  439:        const char      *stesc; /* start of an escape sequence ('\\') */
                    440:        const char      *stnam; /* start of the name, after "[(*" */
                    441:        const char      *cp;    /* end of the name, e.g. before ']' */
                    442:        const char      *res;   /* the string to be substituted */
1.170     schwarze  443:        int              i, maxl, expand_count;
1.94      kristaps  444:        size_t           nsz;
                    445:        char            *n;
                    446:
1.170     schwarze  447:        expand_count = 0;
                    448:
1.154     kristaps  449: again:
1.108     schwarze  450:        cp = *bufp + pos;
                    451:        while (NULL != (cp = strchr(cp, '\\'))) {
                    452:                stesc = cp++;
                    453:
                    454:                /*
                    455:                 * The second character must be an asterisk.
                    456:                 * If it isn't, skip it anyway:  It is escaped,
                    457:                 * so it can't start another escape sequence.
                    458:                 */
                    459:
                    460:                if ('\0' == *cp)
1.172   ! schwarze  461:                        return(ROFF_CONT);
1.152     kristaps  462:
                    463:                if ('*' != *cp) {
                    464:                        res = cp;
                    465:                        esc = mandoc_escape(&cp, NULL, NULL);
                    466:                        if (ESCAPE_ERROR != esc)
                    467:                                continue;
                    468:                        cp = res;
1.153     kristaps  469:                        mandoc_msg
                    470:                                (MANDOCERR_BADESCAPE, r->parse,
                    471:                                 ln, (int)(stesc - *bufp), NULL);
1.172   ! schwarze  472:                        return(ROFF_CONT);
1.152     kristaps  473:                }
                    474:
                    475:                cp++;
1.108     schwarze  476:
                    477:                /*
                    478:                 * The third character decides the length
                    479:                 * of the name of the string.
                    480:                 * Save a pointer to the name.
                    481:                 */
                    482:
1.94      kristaps  483:                switch (*cp) {
1.108     schwarze  484:                case ('\0'):
1.172   ! schwarze  485:                        return(ROFF_CONT);
1.94      kristaps  486:                case ('('):
                    487:                        cp++;
                    488:                        maxl = 2;
                    489:                        break;
                    490:                case ('['):
                    491:                        cp++;
                    492:                        maxl = 0;
                    493:                        break;
                    494:                default:
                    495:                        maxl = 1;
                    496:                        break;
                    497:                }
1.108     schwarze  498:                stnam = cp;
1.94      kristaps  499:
1.108     schwarze  500:                /* Advance to the end of the name. */
1.94      kristaps  501:
                    502:                for (i = 0; 0 == maxl || i < maxl; i++, cp++) {
1.153     kristaps  503:                        if ('\0' == *cp) {
                    504:                                mandoc_msg
                    505:                                        (MANDOCERR_BADESCAPE,
                    506:                                         r->parse, ln,
                    507:                                         (int)(stesc - *bufp), NULL);
1.172   ! schwarze  508:                                return(ROFF_CONT);
1.153     kristaps  509:                        }
1.94      kristaps  510:                        if (0 == maxl && ']' == *cp)
                    511:                                break;
                    512:                }
                    513:
1.108     schwarze  514:                /*
                    515:                 * Retrieve the replacement string; if it is
                    516:                 * undefined, resume searching for escapes.
                    517:                 */
                    518:
                    519:                res = roff_getstrn(r, stnam, (size_t)i);
1.94      kristaps  520:
                    521:                if (NULL == res) {
1.153     kristaps  522:                        mandoc_msg
                    523:                                (MANDOCERR_BADESCAPE, r->parse,
                    524:                                 ln, (int)(stesc - *bufp), NULL);
1.142     kristaps  525:                        res = "";
1.94      kristaps  526:                }
                    527:
1.108     schwarze  528:                /* Replace the escape sequence by the string. */
                    529:
1.161     kristaps  530:                pos = stesc - *bufp;
1.154     kristaps  531:
1.94      kristaps  532:                nsz = *szp + strlen(res) + 1;
                    533:                n = mandoc_malloc(nsz);
                    534:
1.108     schwarze  535:                strlcpy(n, *bufp, (size_t)(stesc - *bufp + 1));
1.94      kristaps  536:                strlcat(n, res, nsz);
                    537:                strlcat(n, cp + (maxl ? 0 : 1), nsz);
                    538:
                    539:                free(*bufp);
                    540:
                    541:                *bufp = n;
                    542:                *szp = nsz;
1.170     schwarze  543:
                    544:                if (EXPAND_LIMIT >= ++expand_count)
                    545:                        goto again;
                    546:
                    547:                /* Just leave the string unexpanded. */
                    548:                mandoc_msg(MANDOCERR_ROFFLOOP, r->parse, ln, pos, NULL);
1.172   ! schwarze  549:                return(ROFF_IGN);
1.154     kristaps  550:        }
1.172   ! schwarze  551:        return(ROFF_CONT);
1.154     kristaps  552: }
                    553:
                    554: /*
                    555:  * Process text streams: convert all breakable hyphens into ASCII_HYPH.
                    556:  */
                    557: static enum rofferr
                    558: roff_parsetext(char *p)
                    559: {
                    560:        size_t           sz;
                    561:        const char      *start;
                    562:        enum mandoc_esc  esc;
                    563:
                    564:        start = p;
                    565:
                    566:        while ('\0' != *p) {
                    567:                sz = strcspn(p, "-\\");
                    568:                p += sz;
                    569:
1.159     kristaps  570:                if ('\0' == *p)
                    571:                        break;
                    572:
1.154     kristaps  573:                if ('\\' == *p) {
                    574:                        /* Skip over escapes. */
                    575:                        p++;
                    576:                        esc = mandoc_escape
                    577:                                ((const char **)&p, NULL, NULL);
                    578:                        if (ESCAPE_ERROR == esc)
                    579:                                break;
1.155     kristaps  580:                        continue;
1.159     kristaps  581:                } else if (p == start) {
1.158     kristaps  582:                        p++;
1.155     kristaps  583:                        continue;
1.158     kristaps  584:                }
1.155     kristaps  585:
1.171     schwarze  586:                if (isalpha((unsigned char)p[-1]) &&
                    587:                    isalpha((unsigned char)p[1]))
1.155     kristaps  588:                        *p = ASCII_HYPH;
                    589:                p++;
1.94      kristaps  590:        }
                    591:
1.154     kristaps  592:        return(ROFF_CONT);
1.94      kristaps  593: }
                    594:
1.67      kristaps  595: enum rofferr
1.90      kristaps  596: roff_parseln(struct roff *r, int ln, char **bufp,
                    597:                size_t *szp, int pos, int *offs)
1.67      kristaps  598: {
                    599:        enum rofft       t;
1.109     kristaps  600:        enum rofferr     e;
1.130     kristaps  601:        int              ppos, ctl;
1.79      kristaps  602:
                    603:        /*
1.94      kristaps  604:         * Run the reserved-word filter only if we have some reserved
                    605:         * words to fill in.
                    606:         */
                    607:
1.172   ! schwarze  608:        e = roff_res(r, bufp, szp, ln, pos);
        !           609:        if (ROFF_IGN == e)
        !           610:                return(e);
        !           611:        assert(ROFF_CONT == e);
1.94      kristaps  612:
1.130     kristaps  613:        ppos = pos;
                    614:        ctl = mandoc_getcontrol(*bufp, &pos);
                    615:
1.94      kristaps  616:        /*
1.79      kristaps  617:         * First, if a scope is open and we're not a macro, pass the
                    618:         * text through the macro's filter.  If a scope isn't open and
                    619:         * we're not a macro, just let it through.
1.125     kristaps  620:         * Finally, if there's an equation scope open, divert it into it
                    621:         * no matter our state.
1.79      kristaps  622:         */
1.74      kristaps  623:
1.130     kristaps  624:        if (r->last && ! ctl) {
1.78      kristaps  625:                t = r->last->tok;
                    626:                assert(roffs[t].text);
1.109     kristaps  627:                e = (*roffs[t].text)
                    628:                        (r, t, bufp, szp, ln, pos, pos, offs);
                    629:                assert(ROFF_IGN == e || ROFF_CONT == e);
1.125     kristaps  630:                if (ROFF_CONT != e)
                    631:                        return(e);
                    632:                if (r->eqn)
1.146     kristaps  633:                        return(eqn_read(&r->eqn, ln, *bufp, pos, offs));
1.125     kristaps  634:                if (r->tbl)
1.130     kristaps  635:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.154     kristaps  636:                return(roff_parsetext(*bufp + pos));
1.130     kristaps  637:        } else if ( ! ctl) {
1.125     kristaps  638:                if (r->eqn)
1.146     kristaps  639:                        return(eqn_read(&r->eqn, ln, *bufp, pos, offs));
1.109     kristaps  640:                if (r->tbl)
1.130     kristaps  641:                        return(tbl_read(r->tbl, ln, *bufp, pos));
1.154     kristaps  642:                return(roff_parsetext(*bufp + pos));
1.125     kristaps  643:        } else if (r->eqn)
1.146     kristaps  644:                return(eqn_read(&r->eqn, ln, *bufp, ppos, offs));
1.67      kristaps  645:
1.79      kristaps  646:        /*
                    647:         * If a scope is open, go to the child handler for that macro,
                    648:         * as it may want to preprocess before doing anything with it.
1.125     kristaps  649:         * Don't do so if an equation is open.
1.79      kristaps  650:         */
1.78      kristaps  651:
1.79      kristaps  652:        if (r->last) {
                    653:                t = r->last->tok;
                    654:                assert(roffs[t].sub);
                    655:                return((*roffs[t].sub)
1.90      kristaps  656:                                (r, t, bufp, szp,
1.130     kristaps  657:                                 ln, ppos, pos, offs));
1.79      kristaps  658:        }
1.78      kristaps  659:
1.79      kristaps  660:        /*
                    661:         * Lastly, as we've no scope open, try to look up and execute
                    662:         * the new macro.  If no macro is found, simply return and let
                    663:         * the compilers handle it.
                    664:         */
1.67      kristaps  665:
1.106     kristaps  666:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos)))
1.79      kristaps  667:                return(ROFF_CONT);
1.67      kristaps  668:
1.75      kristaps  669:        assert(roffs[t].proc);
1.78      kristaps  670:        return((*roffs[t].proc)
1.90      kristaps  671:                        (r, t, bufp, szp,
                    672:                         ln, ppos, pos, offs));
1.74      kristaps  673: }
                    674:
                    675:
1.117     kristaps  676: void
1.74      kristaps  677: roff_endparse(struct roff *r)
                    678: {
                    679:
1.110     kristaps  680:        if (r->last)
1.128     kristaps  681:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.109     kristaps  682:                                r->last->line, r->last->col, NULL);
1.117     kristaps  683:
1.125     kristaps  684:        if (r->eqn) {
1.128     kristaps  685:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.148     kristaps  686:                                r->eqn->eqn.ln, r->eqn->eqn.pos, NULL);
1.151     kristaps  687:                eqn_end(&r->eqn);
1.125     kristaps  688:        }
                    689:
1.117     kristaps  690:        if (r->tbl) {
1.128     kristaps  691:                mandoc_msg(MANDOCERR_SCOPEEXIT, r->parse,
1.117     kristaps  692:                                r->tbl->line, r->tbl->pos, NULL);
1.151     kristaps  693:                tbl_end(&r->tbl);
1.117     kristaps  694:        }
1.67      kristaps  695: }
                    696:
                    697: /*
                    698:  * Parse a roff node's type from the input buffer.  This must be in the
                    699:  * form of ".foo xxx" in the usual way.
                    700:  */
                    701: static enum rofft
1.106     kristaps  702: roff_parse(struct roff *r, const char *buf, int *pos)
1.67      kristaps  703: {
1.106     kristaps  704:        const char      *mac;
                    705:        size_t           maclen;
1.67      kristaps  706:        enum rofft       t;
                    707:
1.144     kristaps  708:        if ('\0' == buf[*pos] || '"' == buf[*pos] ||
                    709:                        '\t' == buf[*pos] || ' ' == buf[*pos])
1.67      kristaps  710:                return(ROFF_MAX);
                    711:
1.144     kristaps  712:        /*
                    713:         * We stop the macro parse at an escape, tab, space, or nil.
                    714:         * However, `\}' is also a valid macro, so make sure we don't
                    715:         * clobber it by seeing the `\' as the end of token.
                    716:         */
                    717:
1.106     kristaps  718:        mac = buf + *pos;
1.144     kristaps  719:        maclen = strcspn(mac + 1, " \\\t\0") + 1;
1.67      kristaps  720:
1.106     kristaps  721:        t = (r->current_string = roff_getstrn(r, mac, maclen))
1.155     kristaps  722:            ? ROFF_USERDEF : roffhash_find(mac, maclen);
1.67      kristaps  723:
1.127     kristaps  724:        *pos += (int)maclen;
1.130     kristaps  725:
1.67      kristaps  726:        while (buf[*pos] && ' ' == buf[*pos])
                    727:                (*pos)++;
                    728:
                    729:        return(t);
                    730: }
                    731:
                    732: /* ARGSUSED */
                    733: static enum rofferr
1.76      kristaps  734: roff_cblock(ROFF_ARGS)
1.67      kristaps  735: {
                    736:
1.79      kristaps  737:        /*
                    738:         * A block-close `..' should only be invoked as a child of an
                    739:         * ignore macro, otherwise raise a warning and just ignore it.
                    740:         */
                    741:
1.76      kristaps  742:        if (NULL == r->last) {
1.128     kristaps  743:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  744:                return(ROFF_IGN);
                    745:        }
1.67      kristaps  746:
1.81      kristaps  747:        switch (r->last->tok) {
                    748:        case (ROFF_am):
                    749:                /* FALLTHROUGH */
                    750:        case (ROFF_ami):
                    751:                /* FALLTHROUGH */
                    752:        case (ROFF_am1):
                    753:                /* FALLTHROUGH */
                    754:        case (ROFF_de):
1.108     schwarze  755:                /* ROFF_de1 is remapped to ROFF_de in roff_block(). */
1.81      kristaps  756:                /* FALLTHROUGH */
                    757:        case (ROFF_dei):
                    758:                /* FALLTHROUGH */
                    759:        case (ROFF_ig):
                    760:                break;
                    761:        default:
1.128     kristaps  762:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.67      kristaps  763:                return(ROFF_IGN);
1.76      kristaps  764:        }
1.67      kristaps  765:
1.76      kristaps  766:        if ((*bufp)[pos])
1.128     kristaps  767:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.71      kristaps  768:
                    769:        roffnode_pop(r);
1.76      kristaps  770:        roffnode_cleanscope(r);
                    771:        return(ROFF_IGN);
1.71      kristaps  772:
1.67      kristaps  773: }
                    774:
                    775:
1.76      kristaps  776: static void
                    777: roffnode_cleanscope(struct roff *r)
1.67      kristaps  778: {
                    779:
1.76      kristaps  780:        while (r->last) {
                    781:                if (--r->last->endspan < 0)
                    782:                        break;
                    783:                roffnode_pop(r);
                    784:        }
1.67      kristaps  785: }
                    786:
                    787:
1.75      kristaps  788: /* ARGSUSED */
1.74      kristaps  789: static enum rofferr
1.75      kristaps  790: roff_ccond(ROFF_ARGS)
1.74      kristaps  791: {
                    792:
1.76      kristaps  793:        if (NULL == r->last) {
1.128     kristaps  794:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  795:                return(ROFF_IGN);
                    796:        }
                    797:
1.82      kristaps  798:        switch (r->last->tok) {
                    799:        case (ROFF_el):
                    800:                /* FALLTHROUGH */
                    801:        case (ROFF_ie):
                    802:                /* FALLTHROUGH */
                    803:        case (ROFF_if):
                    804:                break;
                    805:        default:
1.128     kristaps  806:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.75      kristaps  807:                return(ROFF_IGN);
                    808:        }
                    809:
1.76      kristaps  810:        if (r->last->endspan > -1) {
1.128     kristaps  811:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.76      kristaps  812:                return(ROFF_IGN);
                    813:        }
                    814:
                    815:        if ((*bufp)[pos])
1.128     kristaps  816:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.76      kristaps  817:
1.75      kristaps  818:        roffnode_pop(r);
1.76      kristaps  819:        roffnode_cleanscope(r);
                    820:        return(ROFF_IGN);
                    821: }
                    822:
1.75      kristaps  823:
1.76      kristaps  824: /* ARGSUSED */
                    825: static enum rofferr
1.80      kristaps  826: roff_block(ROFF_ARGS)
1.76      kristaps  827: {
1.78      kristaps  828:        int             sv;
                    829:        size_t          sz;
1.106     kristaps  830:        char            *name;
                    831:
                    832:        name = NULL;
1.76      kristaps  833:
1.106     kristaps  834:        if (ROFF_ig != tok) {
                    835:                if ('\0' == (*bufp)[pos]) {
1.128     kristaps  836:                        mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.106     kristaps  837:                        return(ROFF_IGN);
                    838:                }
1.107     kristaps  839:
                    840:                /*
                    841:                 * Re-write `de1', since we don't really care about
                    842:                 * groff's strange compatibility mode, into `de'.
                    843:                 */
                    844:
1.106     kristaps  845:                if (ROFF_de1 == tok)
                    846:                        tok = ROFF_de;
                    847:                if (ROFF_de == tok)
                    848:                        name = *bufp + pos;
                    849:                else
1.128     kristaps  850:                        mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos,
1.106     kristaps  851:                            roffs[tok].name);
1.107     kristaps  852:
1.131     schwarze  853:                while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.80      kristaps  854:                        pos++;
1.107     kristaps  855:
1.131     schwarze  856:                while (isspace((unsigned char)(*bufp)[pos]))
1.106     kristaps  857:                        (*bufp)[pos++] = '\0';
1.80      kristaps  858:        }
                    859:
1.106     kristaps  860:        roffnode_push(r, tok, name, ln, ppos);
                    861:
                    862:        /*
                    863:         * At the beginning of a `de' macro, clear the existing string
                    864:         * with the same name, if there is one.  New content will be
                    865:         * added from roff_block_text() in multiline mode.
                    866:         */
1.107     kristaps  867:
1.106     kristaps  868:        if (ROFF_de == tok)
1.108     schwarze  869:                roff_setstr(r, name, "", 0);
1.76      kristaps  870:
1.79      kristaps  871:        if ('\0' == (*bufp)[pos])
1.78      kristaps  872:                return(ROFF_IGN);
                    873:
1.107     kristaps  874:        /* If present, process the custom end-of-line marker. */
                    875:
1.78      kristaps  876:        sv = pos;
1.131     schwarze  877:        while ((*bufp)[pos] && ! isspace((unsigned char)(*bufp)[pos]))
1.78      kristaps  878:                pos++;
                    879:
                    880:        /*
                    881:         * Note: groff does NOT like escape characters in the input.
                    882:         * Instead of detecting this, we're just going to let it fly and
                    883:         * to hell with it.
                    884:         */
                    885:
                    886:        assert(pos > sv);
                    887:        sz = (size_t)(pos - sv);
                    888:
1.79      kristaps  889:        if (1 == sz && '.' == (*bufp)[sv])
                    890:                return(ROFF_IGN);
                    891:
1.98      schwarze  892:        r->last->end = mandoc_malloc(sz + 1);
1.78      kristaps  893:
                    894:        memcpy(r->last->end, *bufp + sv, sz);
                    895:        r->last->end[(int)sz] = '\0';
                    896:
1.77      kristaps  897:        if ((*bufp)[pos])
1.128     kristaps  898:                mandoc_msg(MANDOCERR_ARGSLOST, r->parse, ln, pos, NULL);
1.74      kristaps  899:
1.78      kristaps  900:        return(ROFF_IGN);
                    901: }
                    902:
                    903:
                    904: /* ARGSUSED */
                    905: static enum rofferr
1.80      kristaps  906: roff_block_sub(ROFF_ARGS)
1.79      kristaps  907: {
                    908:        enum rofft      t;
                    909:        int             i, j;
                    910:
                    911:        /*
                    912:         * First check whether a custom macro exists at this level.  If
                    913:         * it does, then check against it.  This is some of groff's
                    914:         * stranger behaviours.  If we encountered a custom end-scope
                    915:         * tag and that tag also happens to be a "real" macro, then we
                    916:         * need to try interpreting it again as a real macro.  If it's
                    917:         * not, then return ignore.  Else continue.
                    918:         */
                    919:
                    920:        if (r->last->end) {
1.130     kristaps  921:                for (i = pos, j = 0; r->last->end[j]; j++, i++)
1.79      kristaps  922:                        if ((*bufp)[i] != r->last->end[j])
                    923:                                break;
                    924:
                    925:                if ('\0' == r->last->end[j] &&
                    926:                                ('\0' == (*bufp)[i] ||
                    927:                                 ' ' == (*bufp)[i] ||
                    928:                                 '\t' == (*bufp)[i])) {
                    929:                        roffnode_pop(r);
                    930:                        roffnode_cleanscope(r);
                    931:
1.130     kristaps  932:                        while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
                    933:                                i++;
                    934:
                    935:                        pos = i;
1.106     kristaps  936:                        if (ROFF_MAX != roff_parse(r, *bufp, &pos))
1.79      kristaps  937:                                return(ROFF_RERUN);
                    938:                        return(ROFF_IGN);
                    939:                }
                    940:        }
                    941:
                    942:        /*
                    943:         * If we have no custom end-query or lookup failed, then try
                    944:         * pulling it out of the hashtable.
                    945:         */
                    946:
1.137     schwarze  947:        t = roff_parse(r, *bufp, &pos);
1.79      kristaps  948:
1.106     kristaps  949:        /*
                    950:         * Macros other than block-end are only significant
                    951:         * in `de' blocks; elsewhere, simply throw them away.
                    952:         */
                    953:        if (ROFF_cblock != t) {
                    954:                if (ROFF_de == tok)
                    955:                        roff_setstr(r, r->last->name, *bufp + ppos, 1);
1.79      kristaps  956:                return(ROFF_IGN);
1.106     kristaps  957:        }
1.79      kristaps  958:
                    959:        assert(roffs[t].proc);
1.90      kristaps  960:        return((*roffs[t].proc)(r, t, bufp, szp,
                    961:                                ln, ppos, pos, offs));
1.79      kristaps  962: }
                    963:
                    964:
                    965: /* ARGSUSED */
                    966: static enum rofferr
1.80      kristaps  967: roff_block_text(ROFF_ARGS)
1.78      kristaps  968: {
                    969:
1.106     kristaps  970:        if (ROFF_de == tok)
                    971:                roff_setstr(r, r->last->name, *bufp + pos, 1);
                    972:
1.78      kristaps  973:        return(ROFF_IGN);
                    974: }
                    975:
                    976:
                    977: /* ARGSUSED */
                    978: static enum rofferr
1.82      kristaps  979: roff_cond_sub(ROFF_ARGS)
                    980: {
                    981:        enum rofft       t;
                    982:        enum roffrule    rr;
1.139     kristaps  983:        char            *ep;
1.82      kristaps  984:
                    985:        rr = r->last->rule;
1.139     kristaps  986:        roffnode_cleanscope(r);
1.82      kristaps  987:
1.139     kristaps  988:        /*
                    989:         * If the macro is unknown, first check if it contains a closing
                    990:         * delimiter `\}'.  If it does, close out our scope and return
                    991:         * the currently-scoped rule (ignore or continue).  Else, drop
                    992:         * into the currently-scoped rule.
1.87      kristaps  993:         */
                    994:
1.106     kristaps  995:        if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos))) {
1.139     kristaps  996:                ep = &(*bufp)[pos];
                    997:                for ( ; NULL != (ep = strchr(ep, '\\')); ep++) {
                    998:                        ep++;
                    999:                        if ('}' != *ep)
                   1000:                                continue;
1.144     kristaps 1001:
                   1002:                        /*
                   1003:                         * Make the \} go away.
                   1004:                         * This is a little haphazard, as it's not quite
                   1005:                         * clear how nroff does this.
                   1006:                         * If we're at the end of line, then just chop
                   1007:                         * off the \} and resize the buffer.
                   1008:                         * If we aren't, then conver it to spaces.
                   1009:                         */
                   1010:
                   1011:                        if ('\0' == *(ep + 1)) {
                   1012:                                *--ep = '\0';
                   1013:                                *szp -= 2;
                   1014:                        } else
                   1015:                                *(ep - 1) = *ep = ' ';
                   1016:
1.139     kristaps 1017:                        roff_ccond(r, ROFF_ccond, bufp, szp,
                   1018:                                        ln, pos, pos + 2, offs);
                   1019:                        break;
                   1020:                }
1.82      kristaps 1021:                return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.100     kristaps 1022:        }
1.82      kristaps 1023:
                   1024:        /*
                   1025:         * A denied conditional must evaluate its children if and only
                   1026:         * if they're either structurally required (such as loops and
                   1027:         * conditionals) or a closing macro.
                   1028:         */
1.139     kristaps 1029:
1.82      kristaps 1030:        if (ROFFRULE_DENY == rr)
                   1031:                if ( ! (ROFFMAC_STRUCT & roffs[t].flags))
                   1032:                        if (ROFF_ccond != t)
                   1033:                                return(ROFF_IGN);
                   1034:
                   1035:        assert(roffs[t].proc);
1.90      kristaps 1036:        return((*roffs[t].proc)(r, t, bufp, szp,
                   1037:                                ln, ppos, pos, offs));
1.82      kristaps 1038: }
                   1039:
                   1040: /* ARGSUSED */
                   1041: static enum rofferr
                   1042: roff_cond_text(ROFF_ARGS)
1.78      kristaps 1043: {
1.140     kristaps 1044:        char            *ep;
1.82      kristaps 1045:        enum roffrule    rr;
                   1046:
                   1047:        rr = r->last->rule;
1.140     kristaps 1048:        roffnode_cleanscope(r);
1.82      kristaps 1049:
1.140     kristaps 1050:        ep = &(*bufp)[pos];
                   1051:        for ( ; NULL != (ep = strchr(ep, '\\')); ep++) {
                   1052:                ep++;
                   1053:                if ('}' != *ep)
                   1054:                        continue;
                   1055:                *ep = '&';
                   1056:                roff_ccond(r, ROFF_ccond, bufp, szp,
                   1057:                                ln, pos, pos + 2, offs);
1.78      kristaps 1058:        }
1.82      kristaps 1059:        return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.74      kristaps 1060: }
                   1061:
1.88      kristaps 1062: static enum roffrule
                   1063: roff_evalcond(const char *v, int *pos)
                   1064: {
                   1065:
                   1066:        switch (v[*pos]) {
                   1067:        case ('n'):
                   1068:                (*pos)++;
                   1069:                return(ROFFRULE_ALLOW);
                   1070:        case ('e'):
                   1071:                /* FALLTHROUGH */
                   1072:        case ('o'):
                   1073:                /* FALLTHROUGH */
                   1074:        case ('t'):
                   1075:                (*pos)++;
                   1076:                return(ROFFRULE_DENY);
                   1077:        default:
                   1078:                break;
                   1079:        }
                   1080:
                   1081:        while (v[*pos] && ' ' != v[*pos])
                   1082:                (*pos)++;
                   1083:        return(ROFFRULE_DENY);
                   1084: }
                   1085:
1.75      kristaps 1086: /* ARGSUSED */
1.74      kristaps 1087: static enum rofferr
1.103     kristaps 1088: roff_line_ignore(ROFF_ARGS)
1.89      kristaps 1089: {
1.123     schwarze 1090:
                   1091:        if (ROFF_it == tok)
1.128     kristaps 1092:                mandoc_msg(MANDOCERR_REQUEST, r->parse, ln, ppos, "it");
1.89      kristaps 1093:
                   1094:        return(ROFF_IGN);
                   1095: }
                   1096:
1.104     kristaps 1097: /* ARGSUSED */
                   1098: static enum rofferr
1.82      kristaps 1099: roff_cond(ROFF_ARGS)
1.74      kristaps 1100: {
1.77      kristaps 1101:        int              sv;
1.88      kristaps 1102:        enum roffrule    rule;
1.74      kristaps 1103:
1.134     kristaps 1104:        /*
                   1105:         * An `.el' has no conditional body: it will consume the value
                   1106:         * of the current rstack entry set in prior `ie' calls or
                   1107:         * defaults to DENY.
                   1108:         *
                   1109:         * If we're not an `el', however, then evaluate the conditional.
                   1110:         */
1.133     kristaps 1111:
1.134     kristaps 1112:        rule = ROFF_el == tok ?
                   1113:                (r->rstackpos < 0 ?
                   1114:                 ROFFRULE_DENY : r->rstack[r->rstackpos--]) :
                   1115:                roff_evalcond(*bufp, &pos);
1.77      kristaps 1116:
                   1117:        sv = pos;
1.75      kristaps 1118:        while (' ' == (*bufp)[pos])
                   1119:                pos++;
1.74      kristaps 1120:
1.77      kristaps 1121:        /*
                   1122:         * Roff is weird.  If we have just white-space after the
                   1123:         * conditional, it's considered the BODY and we exit without
                   1124:         * really doing anything.  Warn about this.  It's probably
                   1125:         * wrong.
                   1126:         */
1.88      kristaps 1127:
1.77      kristaps 1128:        if ('\0' == (*bufp)[pos] && sv != pos) {
1.128     kristaps 1129:                mandoc_msg(MANDOCERR_NOARGS, r->parse, ln, ppos, NULL);
1.107     kristaps 1130:                return(ROFF_IGN);
1.77      kristaps 1131:        }
                   1132:
1.106     kristaps 1133:        roffnode_push(r, tok, NULL, ln, ppos);
1.77      kristaps 1134:
1.88      kristaps 1135:        r->last->rule = rule;
                   1136:
1.134     kristaps 1137:        /*
                   1138:         * An if-else will put the NEGATION of the current evaluated
                   1139:         * conditional into the stack of rules.
                   1140:         */
                   1141:
1.84      schwarze 1142:        if (ROFF_ie == tok) {
1.134     kristaps 1143:                if (r->rstackpos == RSTACK_MAX - 1) {
                   1144:                        mandoc_msg(MANDOCERR_MEM,
                   1145:                                r->parse, ln, ppos, NULL);
                   1146:                        return(ROFF_ERR);
                   1147:                }
                   1148:                r->rstack[++r->rstackpos] =
                   1149:                        ROFFRULE_DENY == r->last->rule ?
                   1150:                        ROFFRULE_ALLOW : ROFFRULE_DENY;
1.82      kristaps 1151:        }
1.88      kristaps 1152:
                   1153:        /* If the parent has false as its rule, then so do we. */
                   1154:
1.109     kristaps 1155:        if (r->last->parent && ROFFRULE_DENY == r->last->parent->rule)
1.84      schwarze 1156:                r->last->rule = ROFFRULE_DENY;
1.88      kristaps 1157:
                   1158:        /*
                   1159:         * Determine scope.  If we're invoked with "\{" trailing the
                   1160:         * conditional, then we're in a multiline scope.  Else our scope
                   1161:         * expires on the next line.
                   1162:         */
1.74      kristaps 1163:
1.75      kristaps 1164:        r->last->endspan = 1;
                   1165:
                   1166:        if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
                   1167:                r->last->endspan = -1;
                   1168:                pos += 2;
1.109     kristaps 1169:        }
1.74      kristaps 1170:
1.77      kristaps 1171:        /*
                   1172:         * If there are no arguments on the line, the next-line scope is
                   1173:         * assumed.
                   1174:         */
                   1175:
1.75      kristaps 1176:        if ('\0' == (*bufp)[pos])
                   1177:                return(ROFF_IGN);
1.77      kristaps 1178:
                   1179:        /* Otherwise re-run the roff parser after recalculating. */
1.74      kristaps 1180:
1.75      kristaps 1181:        *offs = pos;
                   1182:        return(ROFF_RERUN);
1.83      schwarze 1183: }
                   1184:
                   1185:
                   1186: /* ARGSUSED */
                   1187: static enum rofferr
1.92      schwarze 1188: roff_ds(ROFF_ARGS)
                   1189: {
1.96      kristaps 1190:        char            *name, *string;
                   1191:
                   1192:        /*
                   1193:         * A symbol is named by the first word following the macro
                   1194:         * invocation up to a space.  Its value is anything after the
                   1195:         * name's trailing whitespace and optional double-quote.  Thus,
                   1196:         *
                   1197:         *  [.ds foo "bar  "     ]
                   1198:         *
                   1199:         * will have `bar  "     ' as its value.
                   1200:         */
1.92      schwarze 1201:
1.121     schwarze 1202:        string = *bufp + pos;
                   1203:        name = roff_getname(r, &string, ln, pos);
1.92      schwarze 1204:        if ('\0' == *name)
                   1205:                return(ROFF_IGN);
                   1206:
1.121     schwarze 1207:        /* Read past initial double-quote. */
                   1208:        if ('"' == *string)
1.92      schwarze 1209:                string++;
                   1210:
1.96      kristaps 1211:        /* The rest is the value. */
1.106     kristaps 1212:        roff_setstr(r, name, string, 0);
1.92      schwarze 1213:        return(ROFF_IGN);
                   1214: }
                   1215:
1.147     kristaps 1216: int
                   1217: roff_regisset(const struct roff *r, enum regs reg)
                   1218: {
                   1219:
                   1220:        return(r->regs[(int)reg].set);
                   1221: }
                   1222:
                   1223: unsigned int
                   1224: roff_regget(const struct roff *r, enum regs reg)
                   1225: {
                   1226:
                   1227:        return(r->regs[(int)reg].u);
                   1228: }
                   1229:
                   1230: void
                   1231: roff_regunset(struct roff *r, enum regs reg)
                   1232: {
                   1233:
                   1234:        r->regs[(int)reg].set = 0;
                   1235: }
1.92      schwarze 1236:
                   1237: /* ARGSUSED */
                   1238: static enum rofferr
1.89      kristaps 1239: roff_nr(ROFF_ARGS)
1.83      schwarze 1240: {
1.121     schwarze 1241:        const char      *key;
                   1242:        char            *val;
1.138     kristaps 1243:        int              iv;
1.89      kristaps 1244:
1.121     schwarze 1245:        val = *bufp + pos;
                   1246:        key = roff_getname(r, &val, ln, pos);
1.89      kristaps 1247:
                   1248:        if (0 == strcmp(key, "nS")) {
1.147     kristaps 1249:                r->regs[(int)REG_nS].set = 1;
1.149     kristaps 1250:                if ((iv = mandoc_strntoi(val, strlen(val), 10)) >= 0)
1.147     kristaps 1251:                        r->regs[(int)REG_nS].u = (unsigned)iv;
1.138     kristaps 1252:                else
1.147     kristaps 1253:                        r->regs[(int)REG_nS].u = 0u;
1.109     kristaps 1254:        }
                   1255:
1.122     schwarze 1256:        return(ROFF_IGN);
                   1257: }
                   1258:
                   1259: /* ARGSUSED */
                   1260: static enum rofferr
                   1261: roff_rm(ROFF_ARGS)
                   1262: {
                   1263:        const char       *name;
                   1264:        char             *cp;
                   1265:
                   1266:        cp = *bufp + pos;
                   1267:        while ('\0' != *cp) {
1.127     kristaps 1268:                name = roff_getname(r, &cp, ln, (int)(cp - *bufp));
1.122     schwarze 1269:                if ('\0' != *name)
                   1270:                        roff_setstr(r, name, NULL, 0);
                   1271:        }
1.109     kristaps 1272:        return(ROFF_IGN);
                   1273: }
                   1274:
                   1275: /* ARGSUSED */
                   1276: static enum rofferr
                   1277: roff_TE(ROFF_ARGS)
                   1278: {
                   1279:
                   1280:        if (NULL == r->tbl)
1.128     kristaps 1281:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.115     kristaps 1282:        else
1.151     kristaps 1283:                tbl_end(&r->tbl);
1.109     kristaps 1284:
1.112     kristaps 1285:        return(ROFF_IGN);
                   1286: }
                   1287:
                   1288: /* ARGSUSED */
                   1289: static enum rofferr
                   1290: roff_T_(ROFF_ARGS)
                   1291: {
                   1292:
                   1293:        if (NULL == r->tbl)
1.128     kristaps 1294:                mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.112     kristaps 1295:        else
1.116     kristaps 1296:                tbl_restart(ppos, ln, r->tbl);
1.112     kristaps 1297:
1.109     kristaps 1298:        return(ROFF_IGN);
                   1299: }
                   1300:
1.156     kristaps 1301: #if 0
                   1302: static int
1.151     kristaps 1303: roff_closeeqn(struct roff *r)
                   1304: {
                   1305:
                   1306:        return(r->eqn && ROFF_EQN == eqn_end(&r->eqn) ? 1 : 0);
                   1307: }
1.156     kristaps 1308: #endif
1.151     kristaps 1309:
1.156     kristaps 1310: static void
1.151     kristaps 1311: roff_openeqn(struct roff *r, const char *name, int line,
                   1312:                int offs, const char *buf)
1.125     kristaps 1313: {
1.151     kristaps 1314:        struct eqn_node *e;
                   1315:        int              poff;
1.125     kristaps 1316:
                   1317:        assert(NULL == r->eqn);
1.151     kristaps 1318:        e = eqn_alloc(name, offs, line, r->parse);
1.125     kristaps 1319:
                   1320:        if (r->last_eqn)
                   1321:                r->last_eqn->next = e;
                   1322:        else
                   1323:                r->first_eqn = r->last_eqn = e;
                   1324:
                   1325:        r->eqn = r->last_eqn = e;
1.151     kristaps 1326:
                   1327:        if (buf) {
                   1328:                poff = 0;
                   1329:                eqn_read(&r->eqn, line, buf, offs, &poff);
                   1330:        }
                   1331: }
                   1332:
                   1333: /* ARGSUSED */
                   1334: static enum rofferr
                   1335: roff_EQ(ROFF_ARGS)
                   1336: {
                   1337:
                   1338:        roff_openeqn(r, *bufp + pos, ln, ppos, NULL);
1.125     kristaps 1339:        return(ROFF_IGN);
                   1340: }
                   1341:
                   1342: /* ARGSUSED */
                   1343: static enum rofferr
                   1344: roff_EN(ROFF_ARGS)
                   1345: {
                   1346:
1.128     kristaps 1347:        mandoc_msg(MANDOCERR_NOSCOPE, r->parse, ln, ppos, NULL);
1.125     kristaps 1348:        return(ROFF_IGN);
                   1349: }
                   1350:
                   1351: /* ARGSUSED */
                   1352: static enum rofferr
1.109     kristaps 1353: roff_TS(ROFF_ARGS)
                   1354: {
1.118     kristaps 1355:        struct tbl_node *t;
1.89      kristaps 1356:
1.115     kristaps 1357:        if (r->tbl) {
1.128     kristaps 1358:                mandoc_msg(MANDOCERR_SCOPEBROKEN, r->parse, ln, ppos, NULL);
1.151     kristaps 1359:                tbl_end(&r->tbl);
1.115     kristaps 1360:        }
1.83      schwarze 1361:
1.128     kristaps 1362:        t = tbl_alloc(ppos, ln, r->parse);
1.113     kristaps 1363:
                   1364:        if (r->last_tbl)
                   1365:                r->last_tbl->next = t;
                   1366:        else
                   1367:                r->first_tbl = r->last_tbl = t;
                   1368:
                   1369:        r->tbl = r->last_tbl = t;
1.83      schwarze 1370:        return(ROFF_IGN);
1.92      schwarze 1371: }
                   1372:
1.105     kristaps 1373: /* ARGSUSED */
                   1374: static enum rofferr
1.164     kristaps 1375: roff_tr(ROFF_ARGS)
                   1376: {
                   1377:        const char      *p, *first, *second;
                   1378:        size_t           fsz, ssz;
                   1379:        enum mandoc_esc  esc;
                   1380:
                   1381:        p = *bufp + pos;
                   1382:
                   1383:        if ('\0' == *p) {
                   1384:                mandoc_msg(MANDOCERR_ARGCOUNT, r->parse, ln, ppos, NULL);
                   1385:                return(ROFF_IGN);
                   1386:        }
                   1387:
                   1388:        while ('\0' != *p) {
                   1389:                fsz = ssz = 1;
                   1390:
                   1391:                first = p++;
                   1392:                if ('\\' == *first) {
                   1393:                        esc = mandoc_escape(&p, NULL, NULL);
                   1394:                        if (ESCAPE_ERROR == esc) {
                   1395:                                mandoc_msg
                   1396:                                        (MANDOCERR_BADESCAPE, r->parse,
                   1397:                                         ln, (int)(p - *bufp), NULL);
                   1398:                                return(ROFF_IGN);
                   1399:                        }
                   1400:                        fsz = (size_t)(p - first);
                   1401:                }
                   1402:
                   1403:                second = p++;
                   1404:                if ('\\' == *second) {
                   1405:                        esc = mandoc_escape(&p, NULL, NULL);
                   1406:                        if (ESCAPE_ERROR == esc) {
                   1407:                                mandoc_msg
                   1408:                                        (MANDOCERR_BADESCAPE, r->parse,
                   1409:                                         ln, (int)(p - *bufp), NULL);
                   1410:                                return(ROFF_IGN);
                   1411:                        }
                   1412:                        ssz = (size_t)(p - second);
1.165     kristaps 1413:                } else if ('\0' == *second) {
1.164     kristaps 1414:                        mandoc_msg(MANDOCERR_ARGCOUNT, r->parse,
                   1415:                                        ln, (int)(p - *bufp), NULL);
                   1416:                        second = " ";
1.165     kristaps 1417:                        p--;
1.164     kristaps 1418:                }
                   1419:
1.167     kristaps 1420:                if (fsz > 1) {
                   1421:                        roff_setstrn(&r->xmbtab, first,
                   1422:                                        fsz, second, ssz, 0);
                   1423:                        continue;
                   1424:                }
                   1425:
                   1426:                if (NULL == r->xtab)
                   1427:                        r->xtab = mandoc_calloc
                   1428:                                (128, sizeof(struct roffstr));
                   1429:
                   1430:                free(r->xtab[(int)*first].p);
                   1431:                r->xtab[(int)*first].p = mandoc_strndup(second, ssz);
                   1432:                r->xtab[(int)*first].sz = ssz;
1.164     kristaps 1433:        }
                   1434:
                   1435:        return(ROFF_IGN);
                   1436: }
                   1437:
                   1438: /* ARGSUSED */
                   1439: static enum rofferr
1.105     kristaps 1440: roff_so(ROFF_ARGS)
                   1441: {
                   1442:        char *name;
                   1443:
1.128     kristaps 1444:        mandoc_msg(MANDOCERR_SO, r->parse, ln, ppos, NULL);
1.105     kristaps 1445:
                   1446:        /*
                   1447:         * Handle `so'.  Be EXTREMELY careful, as we shouldn't be
                   1448:         * opening anything that's not in our cwd or anything beneath
                   1449:         * it.  Thus, explicitly disallow traversing up the file-system
                   1450:         * or using absolute paths.
                   1451:         */
                   1452:
                   1453:        name = *bufp + pos;
                   1454:        if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
1.128     kristaps 1455:                mandoc_msg(MANDOCERR_SOPATH, r->parse, ln, pos, NULL);
1.105     kristaps 1456:                return(ROFF_ERR);
                   1457:        }
                   1458:
                   1459:        *offs = pos;
                   1460:        return(ROFF_SO);
                   1461: }
1.92      schwarze 1462:
1.106     kristaps 1463: /* ARGSUSED */
                   1464: static enum rofferr
                   1465: roff_userdef(ROFF_ARGS)
1.99      kristaps 1466: {
1.106     kristaps 1467:        const char       *arg[9];
                   1468:        char             *cp, *n1, *n2;
1.119     schwarze 1469:        int               i;
1.106     kristaps 1470:
                   1471:        /*
                   1472:         * Collect pointers to macro argument strings
                   1473:         * and null-terminate them.
                   1474:         */
                   1475:        cp = *bufp + pos;
1.119     schwarze 1476:        for (i = 0; i < 9; i++)
1.120     schwarze 1477:                arg[i] = '\0' == *cp ? "" :
1.136     kristaps 1478:                    mandoc_getarg(r->parse, &cp, ln, &pos);
1.99      kristaps 1479:
1.106     kristaps 1480:        /*
                   1481:         * Expand macro arguments.
1.99      kristaps 1482:         */
1.106     kristaps 1483:        *szp = 0;
                   1484:        n1 = cp = mandoc_strdup(r->current_string);
                   1485:        while (NULL != (cp = strstr(cp, "\\$"))) {
                   1486:                i = cp[2] - '1';
                   1487:                if (0 > i || 8 < i) {
                   1488:                        /* Not an argument invocation. */
                   1489:                        cp += 2;
                   1490:                        continue;
                   1491:                }
                   1492:
                   1493:                *szp = strlen(n1) - 3 + strlen(arg[i]) + 1;
                   1494:                n2 = mandoc_malloc(*szp);
                   1495:
                   1496:                strlcpy(n2, n1, (size_t)(cp - n1 + 1));
                   1497:                strlcat(n2, arg[i], *szp);
                   1498:                strlcat(n2, cp + 3, *szp);
                   1499:
                   1500:                cp = n2 + (cp - n1);
                   1501:                free(n1);
                   1502:                n1 = n2;
1.99      kristaps 1503:        }
                   1504:
1.106     kristaps 1505:        /*
                   1506:         * Replace the macro invocation
                   1507:         * by the expanded macro.
                   1508:         */
                   1509:        free(*bufp);
                   1510:        *bufp = n1;
                   1511:        if (0 == *szp)
                   1512:                *szp = strlen(*bufp) + 1;
                   1513:
                   1514:        return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
                   1515:           ROFF_REPARSE : ROFF_APPEND);
1.99      kristaps 1516: }
1.121     schwarze 1517:
                   1518: static char *
                   1519: roff_getname(struct roff *r, char **cpp, int ln, int pos)
                   1520: {
                   1521:        char     *name, *cp;
                   1522:
                   1523:        name = *cpp;
                   1524:        if ('\0' == *name)
                   1525:                return(name);
                   1526:
                   1527:        /* Read until end of name. */
                   1528:        for (cp = name; '\0' != *cp && ' ' != *cp; cp++) {
                   1529:                if ('\\' != *cp)
                   1530:                        continue;
                   1531:                cp++;
                   1532:                if ('\\' == *cp)
                   1533:                        continue;
1.128     kristaps 1534:                mandoc_msg(MANDOCERR_NAMESC, r->parse, ln, pos, NULL);
1.121     schwarze 1535:                *cp = '\0';
                   1536:                name = cp;
                   1537:        }
                   1538:
                   1539:        /* Nil-terminate name. */
                   1540:        if ('\0' != *cp)
                   1541:                *(cp++) = '\0';
                   1542:
                   1543:        /* Read past spaces. */
                   1544:        while (' ' == *cp)
                   1545:                cp++;
                   1546:
                   1547:        *cpp = cp;
                   1548:        return(name);
                   1549: }
                   1550:
1.106     kristaps 1551: /*
                   1552:  * Store *string into the user-defined string called *name.
                   1553:  * In multiline mode, append to an existing entry and append '\n';
                   1554:  * else replace the existing entry, if there is one.
                   1555:  * To clear an existing entry, call with (*r, *name, NULL, 0).
                   1556:  */
1.94      kristaps 1557: static void
1.106     kristaps 1558: roff_setstr(struct roff *r, const char *name, const char *string,
                   1559:        int multiline)
1.92      schwarze 1560: {
1.164     kristaps 1561:
                   1562:        roff_setstrn(&r->strtab, name, strlen(name), string,
                   1563:                        string ? strlen(string) : 0, multiline);
                   1564: }
                   1565:
                   1566: static void
1.166     kristaps 1567: roff_setstrn(struct roffkv **r, const char *name, size_t namesz,
1.164     kristaps 1568:                const char *string, size_t stringsz, int multiline)
                   1569: {
1.166     kristaps 1570:        struct roffkv   *n;
1.164     kristaps 1571:        char            *c;
                   1572:        int              i;
                   1573:        size_t           oldch, newch;
1.92      schwarze 1574:
1.106     kristaps 1575:        /* Search for an existing string with the same name. */
1.164     kristaps 1576:        n = *r;
                   1577:
1.166     kristaps 1578:        while (n && strcmp(name, n->key.p))
1.92      schwarze 1579:                n = n->next;
1.94      kristaps 1580:
                   1581:        if (NULL == n) {
1.106     kristaps 1582:                /* Create a new string table entry. */
1.166     kristaps 1583:                n = mandoc_malloc(sizeof(struct roffkv));
                   1584:                n->key.p = mandoc_strndup(name, namesz);
                   1585:                n->key.sz = namesz;
                   1586:                n->val.p = NULL;
                   1587:                n->val.sz = 0;
1.164     kristaps 1588:                n->next = *r;
                   1589:                *r = n;
1.106     kristaps 1590:        } else if (0 == multiline) {
                   1591:                /* In multiline mode, append; else replace. */
1.166     kristaps 1592:                free(n->val.p);
                   1593:                n->val.p = NULL;
                   1594:                n->val.sz = 0;
1.106     kristaps 1595:        }
                   1596:
                   1597:        if (NULL == string)
                   1598:                return;
                   1599:
                   1600:        /*
                   1601:         * One additional byte for the '\n' in multiline mode,
                   1602:         * and one for the terminating '\0'.
                   1603:         */
1.164     kristaps 1604:        newch = stringsz + (multiline ? 2u : 1u);
                   1605:
1.166     kristaps 1606:        if (NULL == n->val.p) {
                   1607:                n->val.p = mandoc_malloc(newch);
                   1608:                *n->val.p = '\0';
1.106     kristaps 1609:                oldch = 0;
                   1610:        } else {
1.166     kristaps 1611:                oldch = n->val.sz;
                   1612:                n->val.p = mandoc_realloc(n->val.p, oldch + newch);
1.106     kristaps 1613:        }
                   1614:
                   1615:        /* Skip existing content in the destination buffer. */
1.166     kristaps 1616:        c = n->val.p + (int)oldch;
1.106     kristaps 1617:
                   1618:        /* Append new content to the destination buffer. */
1.164     kristaps 1619:        i = 0;
                   1620:        while (i < (int)stringsz) {
1.106     kristaps 1621:                /*
                   1622:                 * Rudimentary roff copy mode:
                   1623:                 * Handle escaped backslashes.
                   1624:                 */
1.164     kristaps 1625:                if ('\\' == string[i] && '\\' == string[i + 1])
                   1626:                        i++;
                   1627:                *c++ = string[i++];
1.106     kristaps 1628:        }
1.94      kristaps 1629:
1.106     kristaps 1630:        /* Append terminating bytes. */
                   1631:        if (multiline)
                   1632:                *c++ = '\n';
1.163     kristaps 1633:
1.106     kristaps 1634:        *c = '\0';
1.166     kristaps 1635:        n->val.sz = (int)(c - n->val.p);
1.92      schwarze 1636: }
                   1637:
1.94      kristaps 1638: static const char *
                   1639: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92      schwarze 1640: {
1.166     kristaps 1641:        const struct roffkv *n;
1.92      schwarze 1642:
1.164     kristaps 1643:        for (n = r->strtab; n; n = n->next)
1.166     kristaps 1644:                if (0 == strncmp(name, n->key.p, len) &&
                   1645:                                '\0' == n->key.p[(int)len])
                   1646:                        return(n->val.p);
1.94      kristaps 1647:
1.157     kristaps 1648:        return(NULL);
1.92      schwarze 1649: }
                   1650:
1.94      kristaps 1651: static void
1.167     kristaps 1652: roff_freestr(struct roffkv *r)
1.92      schwarze 1653: {
1.166     kristaps 1654:        struct roffkv    *n, *nn;
1.92      schwarze 1655:
1.167     kristaps 1656:        for (n = r; n; n = nn) {
1.166     kristaps 1657:                free(n->key.p);
                   1658:                free(n->val.p);
1.92      schwarze 1659:                nn = n->next;
                   1660:                free(n);
                   1661:        }
1.114     kristaps 1662: }
                   1663:
                   1664: const struct tbl_span *
                   1665: roff_span(const struct roff *r)
                   1666: {
                   1667:
                   1668:        return(r->tbl ? tbl_span(r->tbl) : NULL);
1.125     kristaps 1669: }
                   1670:
                   1671: const struct eqn *
                   1672: roff_eqn(const struct roff *r)
                   1673: {
                   1674:
                   1675:        return(r->last_eqn ? &r->last_eqn->eqn : NULL);
1.164     kristaps 1676: }
                   1677:
                   1678: /*
                   1679:  * Duplicate an input string, making the appropriate character
                   1680:  * conversations (as stipulated by `tr') along the way.
                   1681:  * Returns a heap-allocated string with all the replacements made.
                   1682:  */
                   1683: char *
                   1684: roff_strdup(const struct roff *r, const char *p)
                   1685: {
1.166     kristaps 1686:        const struct roffkv *cp;
1.164     kristaps 1687:        char            *res;
                   1688:        const char      *pp;
                   1689:        size_t           ssz, sz;
                   1690:        enum mandoc_esc  esc;
                   1691:
1.167     kristaps 1692:        if (NULL == r->xmbtab && NULL == r->xtab)
1.164     kristaps 1693:                return(mandoc_strdup(p));
                   1694:        else if ('\0' == *p)
                   1695:                return(mandoc_strdup(""));
                   1696:
                   1697:        /*
                   1698:         * Step through each character looking for term matches
                   1699:         * (remember that a `tr' can be invoked with an escape, which is
                   1700:         * a glyph but the escape is multi-character).
                   1701:         * We only do this if the character hash has been initialised
                   1702:         * and the string is >0 length.
                   1703:         */
                   1704:
                   1705:        res = NULL;
                   1706:        ssz = 0;
                   1707:
                   1708:        while ('\0' != *p) {
1.167     kristaps 1709:                if ('\\' != *p && r->xtab && r->xtab[(int)*p].p) {
                   1710:                        sz = r->xtab[(int)*p].sz;
                   1711:                        res = mandoc_realloc(res, ssz + sz + 1);
                   1712:                        memcpy(res + ssz, r->xtab[(int)*p].p, sz);
                   1713:                        ssz += sz;
                   1714:                        p++;
                   1715:                        continue;
                   1716:                } else if ('\\' != *p) {
                   1717:                        res = mandoc_realloc(res, ssz + 2);
                   1718:                        res[ssz++] = *p++;
                   1719:                        continue;
                   1720:                }
                   1721:
1.164     kristaps 1722:                /* Search for term matches. */
1.167     kristaps 1723:                for (cp = r->xmbtab; cp; cp = cp->next)
1.166     kristaps 1724:                        if (0 == strncmp(p, cp->key.p, cp->key.sz))
1.164     kristaps 1725:                                break;
                   1726:
                   1727:                if (NULL != cp) {
                   1728:                        /*
                   1729:                         * A match has been found.
                   1730:                         * Append the match to the array and move
                   1731:                         * forward by its keysize.
                   1732:                         */
1.166     kristaps 1733:                        res = mandoc_realloc
                   1734:                                (res, ssz + cp->val.sz + 1);
                   1735:                        memcpy(res + ssz, cp->val.p, cp->val.sz);
                   1736:                        ssz += cp->val.sz;
                   1737:                        p += (int)cp->key.sz;
1.164     kristaps 1738:                        continue;
                   1739:                }
                   1740:
1.167     kristaps 1741:                /*
                   1742:                 * Handle escapes carefully: we need to copy
                   1743:                 * over just the escape itself, or else we might
                   1744:                 * do replacements within the escape itself.
                   1745:                 * Make sure to pass along the bogus string.
                   1746:                 */
                   1747:                pp = p++;
                   1748:                esc = mandoc_escape(&p, NULL, NULL);
                   1749:                if (ESCAPE_ERROR == esc) {
                   1750:                        sz = strlen(pp);
1.164     kristaps 1751:                        res = mandoc_realloc(res, ssz + sz + 1);
                   1752:                        memcpy(res + ssz, pp, sz);
1.167     kristaps 1753:                        break;
1.164     kristaps 1754:                }
1.167     kristaps 1755:                /*
                   1756:                 * We bail out on bad escapes.
                   1757:                 * No need to warn: we already did so when
                   1758:                 * roff_res() was called.
                   1759:                 */
                   1760:                sz = (int)(p - pp);
                   1761:                res = mandoc_realloc(res, ssz + sz + 1);
                   1762:                memcpy(res + ssz, pp, sz);
                   1763:                ssz += sz;
1.164     kristaps 1764:        }
                   1765:
                   1766:        res[(int)ssz] = '\0';
                   1767:        return(res);
1.74      kristaps 1768: }

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