Annotation of mandoc/roff.c, Revision 1.107
1.107 ! kristaps 1: /* $Id: roff.c,v 1.106 2010/12/02 10:53:03 kristaps Exp $ */
1.1 kristaps 2: /*
1.67 kristaps 3: * Copyright (c) 2010 Kristaps Dzonsons <kristaps@bsd.lv>
1.93 schwarze 4: * Copyright (c) 2010 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>
1.89 kristaps 23: #include <errno.h>
1.85 kristaps 24: #include <ctype.h>
1.89 kristaps 25: #include <limits.h>
1.1 kristaps 26: #include <stdlib.h>
1.67 kristaps 27: #include <string.h>
1.75 kristaps 28: #include <stdio.h>
1.1 kristaps 29:
1.67 kristaps 30: #include "mandoc.h"
1.43 kristaps 31: #include "roff.h"
1.94 kristaps 32: #include "libmandoc.h"
1.33 kristaps 33:
1.82 kristaps 34: #define RSTACK_MAX 128
35:
1.75 kristaps 36: #define ROFF_CTL(c) \
37: ('.' == (c) || '\'' == (c))
38:
1.88 kristaps 39: #if 1
40: #define ROFF_DEBUG(fmt, args...) \
41: do { /* Nothing. */ } while (/*CONSTCOND*/ 0)
42: #else
43: #define ROFF_DEBUG(fmt, args...) \
44: do { fprintf(stderr, fmt , ##args); } while (/*CONSTCOND*/ 0)
45: #endif
46:
1.67 kristaps 47: enum rofft {
1.103 kristaps 48: ROFF_ad,
1.80 kristaps 49: ROFF_am,
50: ROFF_ami,
51: ROFF_am1,
52: ROFF_de,
53: ROFF_dei,
54: ROFF_de1,
1.83 schwarze 55: ROFF_ds,
1.82 kristaps 56: ROFF_el,
1.103 kristaps 57: ROFF_hy,
1.82 kristaps 58: ROFF_ie,
1.75 kristaps 59: ROFF_if,
1.76 kristaps 60: ROFF_ig,
1.103 kristaps 61: ROFF_ne,
62: ROFF_nh,
1.104 kristaps 63: ROFF_nr,
1.83 schwarze 64: ROFF_rm,
1.105 kristaps 65: ROFF_so,
1.83 schwarze 66: ROFF_tr,
1.76 kristaps 67: ROFF_cblock,
1.100 kristaps 68: ROFF_ccond, /* FIXME: remove this. */
1.106 kristaps 69: ROFF_USERDEF,
1.67 kristaps 70: ROFF_MAX
71: };
72:
1.82 kristaps 73: enum roffrule {
74: ROFFRULE_ALLOW,
75: ROFFRULE_DENY
76: };
77:
1.94 kristaps 78:
79: struct roffstr {
80: char *name; /* key of symbol */
81: char *string; /* current value */
82: struct roffstr *next; /* next in list */
83: };
84:
1.67 kristaps 85: struct roff {
86: struct roffnode *last; /* leaf of stack */
87: mandocmsg msg; /* err/warn/fatal messages */
88: void *data; /* privdata for messages */
1.82 kristaps 89: enum roffrule rstack[RSTACK_MAX]; /* stack of !`ie' rules */
90: int rstackpos; /* position in rstack */
1.90 kristaps 91: struct regset *regs; /* read/writable registers */
1.106 kristaps 92: struct roffstr *first_string; /* user-defined strings & macros */
93: const char *current_string; /* value of last called user macro */
1.79 kristaps 94: };
95:
1.67 kristaps 96: struct roffnode {
97: enum rofft tok; /* type of node */
98: struct roffnode *parent; /* up one in stack */
99: int line; /* parse line */
100: int col; /* parse col */
1.106 kristaps 101: char *name; /* node name, e.g. macro name */
1.79 kristaps 102: char *end; /* end-rules: custom token */
103: int endspan; /* end-rules: next-line or infty */
1.82 kristaps 104: enum roffrule rule; /* current evaluation rule */
1.67 kristaps 105: };
106:
107: #define ROFF_ARGS struct roff *r, /* parse ctx */ \
1.72 kristaps 108: enum rofft tok, /* tok of macro */ \
1.67 kristaps 109: char **bufp, /* input buffer */ \
110: size_t *szp, /* size of input buffer */ \
111: int ln, /* parse line */ \
1.75 kristaps 112: int ppos, /* original pos in buffer */ \
113: int pos, /* current pos in buffer */ \
1.74 kristaps 114: int *offs /* reset offset of buffer data */
1.67 kristaps 115:
116: typedef enum rofferr (*roffproc)(ROFF_ARGS);
117:
118: struct roffmac {
119: const char *name; /* macro name */
1.79 kristaps 120: roffproc proc; /* process new macro */
121: roffproc text; /* process as child text of macro */
122: roffproc sub; /* process as child of macro */
123: int flags;
124: #define ROFFMAC_STRUCT (1 << 0) /* always interpret */
1.85 kristaps 125: struct roffmac *next;
1.67 kristaps 126: };
127:
1.80 kristaps 128: static enum rofferr roff_block(ROFF_ARGS);
129: static enum rofferr roff_block_text(ROFF_ARGS);
130: static enum rofferr roff_block_sub(ROFF_ARGS);
131: static enum rofferr roff_cblock(ROFF_ARGS);
132: static enum rofferr roff_ccond(ROFF_ARGS);
1.82 kristaps 133: static enum rofferr roff_cond(ROFF_ARGS);
134: static enum rofferr roff_cond_text(ROFF_ARGS);
135: static enum rofferr roff_cond_sub(ROFF_ARGS);
1.92 schwarze 136: static enum rofferr roff_ds(ROFF_ARGS);
1.94 kristaps 137: static enum roffrule roff_evalcond(const char *, int *);
138: static void roff_freestr(struct roff *);
139: static const char *roff_getstrn(const struct roff *,
140: const char *, size_t);
1.103 kristaps 141: static enum rofferr roff_line_ignore(ROFF_ARGS);
1.104 kristaps 142: static enum rofferr roff_line_error(ROFF_ARGS);
1.89 kristaps 143: static enum rofferr roff_nr(ROFF_ARGS);
1.95 kristaps 144: static int roff_res(struct roff *,
145: char **, size_t *, int);
1.94 kristaps 146: static void roff_setstr(struct roff *,
1.106 kristaps 147: const char *, const char *, int);
1.105 kristaps 148: static enum rofferr roff_so(ROFF_ARGS);
1.106 kristaps 149: static enum rofferr roff_userdef(ROFF_ARGS);
1.67 kristaps 150:
1.85 kristaps 151: /* See roff_hash_find() */
152:
153: #define ASCII_HI 126
154: #define ASCII_LO 33
155: #define HASHWIDTH (ASCII_HI - ASCII_LO + 1)
156:
157: static struct roffmac *hash[HASHWIDTH];
158:
159: static struct roffmac roffs[ROFF_MAX] = {
1.103 kristaps 160: { "ad", roff_line_ignore, NULL, NULL, 0, NULL },
1.85 kristaps 161: { "am", roff_block, roff_block_text, roff_block_sub, 0, NULL },
162: { "ami", roff_block, roff_block_text, roff_block_sub, 0, NULL },
163: { "am1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
164: { "de", roff_block, roff_block_text, roff_block_sub, 0, NULL },
165: { "dei", roff_block, roff_block_text, roff_block_sub, 0, NULL },
166: { "de1", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.92 schwarze 167: { "ds", roff_ds, NULL, NULL, 0, NULL },
1.85 kristaps 168: { "el", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
1.103 kristaps 169: { "hy", roff_line_ignore, NULL, NULL, 0, NULL },
1.85 kristaps 170: { "ie", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
171: { "if", roff_cond, roff_cond_text, roff_cond_sub, ROFFMAC_STRUCT, NULL },
172: { "ig", roff_block, roff_block_text, roff_block_sub, 0, NULL },
1.103 kristaps 173: { "ne", roff_line_ignore, NULL, NULL, 0, NULL },
174: { "nh", roff_line_ignore, NULL, NULL, 0, NULL },
1.104 kristaps 175: { "nr", roff_nr, NULL, NULL, 0, NULL },
176: { "rm", roff_line_error, NULL, NULL, 0, NULL },
1.105 kristaps 177: { "so", roff_so, NULL, NULL, 0, NULL },
1.103 kristaps 178: { "tr", roff_line_ignore, NULL, NULL, 0, NULL },
1.85 kristaps 179: { ".", roff_cblock, NULL, NULL, 0, NULL },
180: { "\\}", roff_ccond, NULL, NULL, 0, NULL },
1.106 kristaps 181: { NULL, roff_userdef, NULL, NULL, 0, NULL },
1.67 kristaps 182: };
183:
184: static void roff_free1(struct roff *);
1.106 kristaps 185: static enum rofft roff_hash_find(const char *, size_t);
1.85 kristaps 186: static void roff_hash_init(void);
1.76 kristaps 187: static void roffnode_cleanscope(struct roff *);
1.106 kristaps 188: static void roffnode_push(struct roff *, enum rofft,
189: const char *, int, int);
1.67 kristaps 190: static void roffnode_pop(struct roff *);
1.106 kristaps 191: static enum rofft roff_parse(struct roff *, const char *, int *);
1.91 kristaps 192: static int roff_parse_nat(const char *, unsigned int *);
1.67 kristaps 193:
1.85 kristaps 194: /* See roff_hash_find() */
195: #define ROFF_HASH(p) (p[0] - ASCII_LO)
196:
197: static void
198: roff_hash_init(void)
199: {
200: struct roffmac *n;
201: int buc, i;
202:
1.106 kristaps 203: for (i = 0; i < (int)ROFF_USERDEF; i++) {
1.85 kristaps 204: assert(roffs[i].name[0] >= ASCII_LO);
205: assert(roffs[i].name[0] <= ASCII_HI);
206:
207: buc = ROFF_HASH(roffs[i].name);
208:
209: if (NULL != (n = hash[buc])) {
210: for ( ; n->next; n = n->next)
211: /* Do nothing. */ ;
212: n->next = &roffs[i];
213: } else
214: hash[buc] = &roffs[i];
215: }
216: }
217:
1.67 kristaps 218:
219: /*
220: * Look up a roff token by its name. Returns ROFF_MAX if no macro by
221: * the nil-terminated string name could be found.
222: */
223: static enum rofft
1.106 kristaps 224: roff_hash_find(const char *p, size_t s)
1.67 kristaps 225: {
1.85 kristaps 226: int buc;
227: struct roffmac *n;
1.67 kristaps 228:
1.85 kristaps 229: /*
230: * libroff has an extremely simple hashtable, for the time
231: * being, which simply keys on the first character, which must
232: * be printable, then walks a chain. It works well enough until
233: * optimised.
234: */
235:
236: if (p[0] < ASCII_LO || p[0] > ASCII_HI)
237: return(ROFF_MAX);
238:
239: buc = ROFF_HASH(p);
240:
241: if (NULL == (n = hash[buc]))
242: return(ROFF_MAX);
243: for ( ; n; n = n->next)
1.106 kristaps 244: if (0 == strncmp(n->name, p, s) && '\0' == n->name[(int)s])
1.85 kristaps 245: return((enum rofft)(n - roffs));
1.67 kristaps 246:
247: return(ROFF_MAX);
248: }
249:
250:
251: /*
252: * Pop the current node off of the stack of roff instructions currently
253: * pending.
254: */
255: static void
256: roffnode_pop(struct roff *r)
257: {
258: struct roffnode *p;
259:
1.75 kristaps 260: assert(r->last);
261: p = r->last;
1.82 kristaps 262:
263: if (ROFF_el == p->tok)
264: if (r->rstackpos > -1)
265: r->rstackpos--;
266:
1.101 kristaps 267: ROFF_DEBUG("roff: popping scope\n");
1.75 kristaps 268: r->last = r->last->parent;
1.106 kristaps 269: free(p->name);
270: free(p->end);
1.67 kristaps 271: free(p);
272: }
273:
274:
275: /*
276: * Push a roff node onto the instruction stack. This must later be
277: * removed with roffnode_pop().
278: */
1.98 schwarze 279: static void
1.106 kristaps 280: roffnode_push(struct roff *r, enum rofft tok, const char *name,
281: int line, int col)
1.67 kristaps 282: {
283: struct roffnode *p;
284:
1.98 schwarze 285: p = mandoc_calloc(1, sizeof(struct roffnode));
1.67 kristaps 286: p->tok = tok;
1.106 kristaps 287: if (name)
288: p->name = mandoc_strdup(name);
1.67 kristaps 289: p->parent = r->last;
290: p->line = line;
291: p->col = col;
1.79 kristaps 292: p->rule = p->parent ? p->parent->rule : ROFFRULE_DENY;
1.67 kristaps 293:
294: r->last = p;
295: }
296:
297:
298: static void
299: roff_free1(struct roff *r)
300: {
301:
302: while (r->last)
303: roffnode_pop(r);
1.94 kristaps 304: roff_freestr(r);
1.67 kristaps 305: }
306:
307:
308: void
309: roff_reset(struct roff *r)
310: {
311:
312: roff_free1(r);
313: }
314:
315:
316: void
317: roff_free(struct roff *r)
318: {
319:
320: roff_free1(r);
321: free(r);
322: }
323:
324:
325: struct roff *
1.98 schwarze 326: roff_alloc(struct regset *regs, void *data, const mandocmsg msg)
1.67 kristaps 327: {
328: struct roff *r;
329:
1.98 schwarze 330: r = mandoc_calloc(1, sizeof(struct roff));
1.90 kristaps 331: r->regs = regs;
1.67 kristaps 332: r->msg = msg;
333: r->data = data;
1.82 kristaps 334: r->rstackpos = -1;
1.85 kristaps 335:
336: roff_hash_init();
1.67 kristaps 337: return(r);
338: }
339:
340:
1.94 kristaps 341: /*
342: * Pre-filter each and every line for reserved words (one beginning with
343: * `\*', e.g., `\*(ab'). These must be handled before the actual line
344: * is processed.
345: */
346: static int
1.95 kristaps 347: roff_res(struct roff *r, char **bufp, size_t *szp, int pos)
1.94 kristaps 348: {
349: const char *cp, *cpp, *st, *res;
350: int i, maxl;
351: size_t nsz;
352: char *n;
353:
1.95 kristaps 354: /* LINTED */
1.94 kristaps 355: for (cp = &(*bufp)[pos]; (cpp = strstr(cp, "\\*")); cp++) {
356: cp = cpp + 2;
357: switch (*cp) {
358: case ('('):
359: cp++;
360: maxl = 2;
361: break;
362: case ('['):
363: cp++;
364: maxl = 0;
365: break;
366: default:
367: maxl = 1;
368: break;
369: }
370:
371: st = cp;
372:
373: for (i = 0; 0 == maxl || i < maxl; i++, cp++) {
374: if ('\0' == *cp)
375: return(1); /* Error. */
376: if (0 == maxl && ']' == *cp)
377: break;
378: }
379:
380: res = roff_getstrn(r, st, (size_t)i);
381:
382: if (NULL == res) {
383: cp -= maxl ? 1 : 0;
384: continue;
385: }
386:
387: ROFF_DEBUG("roff: splicing reserved: [%.*s]\n", i, st);
388:
389: nsz = *szp + strlen(res) + 1;
390: n = mandoc_malloc(nsz);
391:
392: *n = '\0';
393:
394: strlcat(n, *bufp, (size_t)(cpp - *bufp + 1));
395: strlcat(n, res, nsz);
396: strlcat(n, cp + (maxl ? 0 : 1), nsz);
397:
398: free(*bufp);
399:
400: *bufp = n;
401: *szp = nsz;
402: return(0);
403: }
404:
405: return(1);
406: }
407:
408:
1.67 kristaps 409: enum rofferr
1.90 kristaps 410: roff_parseln(struct roff *r, int ln, char **bufp,
411: size_t *szp, int pos, int *offs)
1.67 kristaps 412: {
413: enum rofft t;
1.79 kristaps 414: int ppos;
415:
416: /*
1.94 kristaps 417: * Run the reserved-word filter only if we have some reserved
418: * words to fill in.
419: */
420:
1.95 kristaps 421: if (r->first_string && ! roff_res(r, bufp, szp, pos))
1.106 kristaps 422: return(ROFF_REPARSE);
1.94 kristaps 423:
424: /*
1.79 kristaps 425: * First, if a scope is open and we're not a macro, pass the
426: * text through the macro's filter. If a scope isn't open and
427: * we're not a macro, just let it through.
428: */
1.74 kristaps 429:
1.75 kristaps 430: if (r->last && ! ROFF_CTL((*bufp)[pos])) {
1.78 kristaps 431: t = r->last->tok;
432: assert(roffs[t].text);
1.88 kristaps 433: ROFF_DEBUG("roff: intercept scoped text: %s, [%s]\n",
434: roffs[t].name, &(*bufp)[pos]);
1.78 kristaps 435: return((*roffs[t].text)
1.90 kristaps 436: (r, t, bufp, szp,
437: ln, pos, pos, offs));
1.94 kristaps 438: } else if ( ! ROFF_CTL((*bufp)[pos]))
1.67 kristaps 439: return(ROFF_CONT);
440:
1.79 kristaps 441: /*
442: * If a scope is open, go to the child handler for that macro,
443: * as it may want to preprocess before doing anything with it.
444: */
1.78 kristaps 445:
1.79 kristaps 446: if (r->last) {
447: t = r->last->tok;
448: assert(roffs[t].sub);
1.101 kristaps 449: ROFF_DEBUG("roff: intercept scoped context: %s, [%s]\n",
450: roffs[t].name, &(*bufp)[pos]);
1.79 kristaps 451: return((*roffs[t].sub)
1.90 kristaps 452: (r, t, bufp, szp,
453: ln, pos, pos, offs));
1.79 kristaps 454: }
1.78 kristaps 455:
1.79 kristaps 456: /*
457: * Lastly, as we've no scope open, try to look up and execute
458: * the new macro. If no macro is found, simply return and let
459: * the compilers handle it.
460: */
1.67 kristaps 461:
1.75 kristaps 462: ppos = pos;
1.106 kristaps 463: if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos)))
1.79 kristaps 464: return(ROFF_CONT);
1.67 kristaps 465:
1.107 ! kristaps 466: ROFF_DEBUG("roff: intercept new-scope: [%s], [%s]\n",
! 467: ROFF_USERDEF == t ? r->current_string : roffs[t].name,
! 468: &(*bufp)[pos]);
! 469:
1.75 kristaps 470: assert(roffs[t].proc);
1.78 kristaps 471: return((*roffs[t].proc)
1.90 kristaps 472: (r, t, bufp, szp,
473: ln, ppos, pos, offs));
1.74 kristaps 474: }
475:
476:
477: int
478: roff_endparse(struct roff *r)
479: {
480:
481: if (NULL == r->last)
482: return(1);
483: return((*r->msg)(MANDOCERR_SCOPEEXIT, r->data, r->last->line,
484: r->last->col, NULL));
1.67 kristaps 485: }
486:
487:
488: /*
489: * Parse a roff node's type from the input buffer. This must be in the
490: * form of ".foo xxx" in the usual way.
491: */
492: static enum rofft
1.106 kristaps 493: roff_parse(struct roff *r, const char *buf, int *pos)
1.67 kristaps 494: {
1.106 kristaps 495: const char *mac;
496: size_t maclen;
1.67 kristaps 497: enum rofft t;
498:
1.75 kristaps 499: assert(ROFF_CTL(buf[*pos]));
500: (*pos)++;
1.67 kristaps 501:
1.106 kristaps 502: while (' ' == buf[*pos] || '\t' == buf[*pos])
1.67 kristaps 503: (*pos)++;
504:
505: if ('\0' == buf[*pos])
506: return(ROFF_MAX);
507:
1.106 kristaps 508: mac = buf + *pos;
509: maclen = strcspn(mac, " \\\t\0");
1.67 kristaps 510:
1.106 kristaps 511: t = (r->current_string = roff_getstrn(r, mac, maclen))
512: ? ROFF_USERDEF : roff_hash_find(mac, maclen);
1.67 kristaps 513:
1.106 kristaps 514: *pos += maclen;
1.67 kristaps 515: while (buf[*pos] && ' ' == buf[*pos])
516: (*pos)++;
517:
518: return(t);
519: }
520:
521:
1.89 kristaps 522: static int
1.91 kristaps 523: roff_parse_nat(const char *buf, unsigned int *res)
1.89 kristaps 524: {
525: char *ep;
526: long lval;
527:
528: errno = 0;
529: lval = strtol(buf, &ep, 10);
530: if (buf[0] == '\0' || *ep != '\0')
531: return(0);
532: if ((errno == ERANGE &&
533: (lval == LONG_MAX || lval == LONG_MIN)) ||
1.91 kristaps 534: (lval > INT_MAX || lval < 0))
1.89 kristaps 535: return(0);
536:
1.91 kristaps 537: *res = (unsigned int)lval;
1.89 kristaps 538: return(1);
539: }
540:
541:
1.67 kristaps 542: /* ARGSUSED */
543: static enum rofferr
1.76 kristaps 544: roff_cblock(ROFF_ARGS)
1.67 kristaps 545: {
546:
1.79 kristaps 547: /*
548: * A block-close `..' should only be invoked as a child of an
549: * ignore macro, otherwise raise a warning and just ignore it.
550: */
551:
1.76 kristaps 552: if (NULL == r->last) {
553: if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
554: return(ROFF_ERR);
555: return(ROFF_IGN);
556: }
1.67 kristaps 557:
1.81 kristaps 558: switch (r->last->tok) {
559: case (ROFF_am):
560: /* FALLTHROUGH */
561: case (ROFF_ami):
562: /* FALLTHROUGH */
563: case (ROFF_am1):
564: /* FALLTHROUGH */
565: case (ROFF_de):
566: /* FALLTHROUGH */
567: case (ROFF_dei):
568: /* FALLTHROUGH */
569: case (ROFF_ig):
570: break;
571: default:
1.76 kristaps 572: if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
573: return(ROFF_ERR);
1.67 kristaps 574: return(ROFF_IGN);
1.76 kristaps 575: }
1.67 kristaps 576:
1.76 kristaps 577: if ((*bufp)[pos])
578: if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL))
579: return(ROFF_ERR);
1.71 kristaps 580:
581: roffnode_pop(r);
1.76 kristaps 582: roffnode_cleanscope(r);
583: return(ROFF_IGN);
1.71 kristaps 584:
1.67 kristaps 585: }
586:
587:
1.76 kristaps 588: static void
589: roffnode_cleanscope(struct roff *r)
1.67 kristaps 590: {
591:
1.76 kristaps 592: while (r->last) {
593: if (--r->last->endspan < 0)
594: break;
595: roffnode_pop(r);
596: }
1.67 kristaps 597: }
598:
599:
1.75 kristaps 600: /* ARGSUSED */
1.74 kristaps 601: static enum rofferr
1.75 kristaps 602: roff_ccond(ROFF_ARGS)
1.74 kristaps 603: {
604:
1.76 kristaps 605: if (NULL == r->last) {
606: if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
607: return(ROFF_ERR);
608: return(ROFF_IGN);
609: }
610:
1.82 kristaps 611: switch (r->last->tok) {
612: case (ROFF_el):
613: /* FALLTHROUGH */
614: case (ROFF_ie):
615: /* FALLTHROUGH */
616: case (ROFF_if):
617: break;
618: default:
1.75 kristaps 619: if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
620: return(ROFF_ERR);
621: return(ROFF_IGN);
622: }
623:
1.76 kristaps 624: if (r->last->endspan > -1) {
625: if ( ! (*r->msg)(MANDOCERR_NOSCOPE, r->data, ln, ppos, NULL))
626: return(ROFF_ERR);
627: return(ROFF_IGN);
628: }
629:
630: if ((*bufp)[pos])
631: if ( ! (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL))
632: return(ROFF_ERR);
633:
1.75 kristaps 634: roffnode_pop(r);
1.76 kristaps 635: roffnode_cleanscope(r);
636: return(ROFF_IGN);
637: }
638:
1.75 kristaps 639:
1.76 kristaps 640: /* ARGSUSED */
641: static enum rofferr
1.80 kristaps 642: roff_block(ROFF_ARGS)
1.76 kristaps 643: {
1.78 kristaps 644: int sv;
645: size_t sz;
1.106 kristaps 646: char *name;
647:
648: name = NULL;
1.76 kristaps 649:
1.106 kristaps 650: if (ROFF_ig != tok) {
651: if ('\0' == (*bufp)[pos]) {
652: (*r->msg)(MANDOCERR_NOARGS, r->data, ln, ppos, NULL);
653: return(ROFF_IGN);
654: }
1.107 ! kristaps 655:
! 656: /*
! 657: * Re-write `de1', since we don't really care about
! 658: * groff's strange compatibility mode, into `de'.
! 659: */
! 660:
1.106 kristaps 661: if (ROFF_de1 == tok)
662: tok = ROFF_de;
663: if (ROFF_de == tok)
664: name = *bufp + pos;
665: else
666: (*r->msg)(MANDOCERR_REQUEST, r->data, ln, ppos,
667: roffs[tok].name);
1.107 ! kristaps 668:
1.80 kristaps 669: while ((*bufp)[pos] && ' ' != (*bufp)[pos])
670: pos++;
1.107 ! kristaps 671:
1.80 kristaps 672: while (' ' == (*bufp)[pos])
1.106 kristaps 673: (*bufp)[pos++] = '\0';
1.80 kristaps 674: }
675:
1.106 kristaps 676: roffnode_push(r, tok, name, ln, ppos);
677:
678: /*
679: * At the beginning of a `de' macro, clear the existing string
680: * with the same name, if there is one. New content will be
681: * added from roff_block_text() in multiline mode.
682: */
1.107 ! kristaps 683:
1.106 kristaps 684: if (ROFF_de == tok)
1.107 ! kristaps 685: roff_setstr(r, name, NULL, 0);
1.76 kristaps 686:
1.79 kristaps 687: if ('\0' == (*bufp)[pos])
1.78 kristaps 688: return(ROFF_IGN);
689:
1.107 ! kristaps 690: /* If present, process the custom end-of-line marker. */
! 691:
1.78 kristaps 692: sv = pos;
1.107 ! kristaps 693: while ((*bufp)[pos] &&
! 694: ' ' != (*bufp)[pos] &&
1.78 kristaps 695: '\t' != (*bufp)[pos])
696: pos++;
697:
698: /*
699: * Note: groff does NOT like escape characters in the input.
700: * Instead of detecting this, we're just going to let it fly and
701: * to hell with it.
702: */
703:
704: assert(pos > sv);
705: sz = (size_t)(pos - sv);
706:
1.79 kristaps 707: if (1 == sz && '.' == (*bufp)[sv])
708: return(ROFF_IGN);
709:
1.98 schwarze 710: r->last->end = mandoc_malloc(sz + 1);
1.78 kristaps 711:
712: memcpy(r->last->end, *bufp + sv, sz);
713: r->last->end[(int)sz] = '\0';
714:
1.77 kristaps 715: if ((*bufp)[pos])
1.107 ! kristaps 716: (*r->msg)(MANDOCERR_ARGSLOST, r->data, ln, pos, NULL);
1.74 kristaps 717:
1.78 kristaps 718: return(ROFF_IGN);
719: }
720:
721:
722: /* ARGSUSED */
723: static enum rofferr
1.80 kristaps 724: roff_block_sub(ROFF_ARGS)
1.79 kristaps 725: {
726: enum rofft t;
727: int i, j;
728:
729: /*
730: * First check whether a custom macro exists at this level. If
731: * it does, then check against it. This is some of groff's
732: * stranger behaviours. If we encountered a custom end-scope
733: * tag and that tag also happens to be a "real" macro, then we
734: * need to try interpreting it again as a real macro. If it's
735: * not, then return ignore. Else continue.
736: */
737:
738: if (r->last->end) {
739: i = pos + 1;
740: while (' ' == (*bufp)[i] || '\t' == (*bufp)[i])
741: i++;
742:
743: for (j = 0; r->last->end[j]; j++, i++)
744: if ((*bufp)[i] != r->last->end[j])
745: break;
746:
747: if ('\0' == r->last->end[j] &&
748: ('\0' == (*bufp)[i] ||
749: ' ' == (*bufp)[i] ||
750: '\t' == (*bufp)[i])) {
751: roffnode_pop(r);
752: roffnode_cleanscope(r);
753:
1.106 kristaps 754: if (ROFF_MAX != roff_parse(r, *bufp, &pos))
1.79 kristaps 755: return(ROFF_RERUN);
756: return(ROFF_IGN);
757: }
758: }
759:
760: /*
761: * If we have no custom end-query or lookup failed, then try
762: * pulling it out of the hashtable.
763: */
764:
765: ppos = pos;
1.106 kristaps 766: t = roff_parse(r, *bufp, &pos);
1.79 kristaps 767:
1.106 kristaps 768: /*
769: * Macros other than block-end are only significant
770: * in `de' blocks; elsewhere, simply throw them away.
771: */
772: if (ROFF_cblock != t) {
773: if (ROFF_de == tok)
774: roff_setstr(r, r->last->name, *bufp + ppos, 1);
1.79 kristaps 775: return(ROFF_IGN);
1.106 kristaps 776: }
1.79 kristaps 777:
778: assert(roffs[t].proc);
1.90 kristaps 779: return((*roffs[t].proc)(r, t, bufp, szp,
780: ln, ppos, pos, offs));
1.79 kristaps 781: }
782:
783:
784: /* ARGSUSED */
785: static enum rofferr
1.80 kristaps 786: roff_block_text(ROFF_ARGS)
1.78 kristaps 787: {
788:
1.106 kristaps 789: if (ROFF_de == tok)
790: roff_setstr(r, r->last->name, *bufp + pos, 1);
791:
1.78 kristaps 792: return(ROFF_IGN);
793: }
794:
795:
796: /* ARGSUSED */
797: static enum rofferr
1.82 kristaps 798: roff_cond_sub(ROFF_ARGS)
799: {
800: enum rofft t;
801: enum roffrule rr;
802:
803: ppos = pos;
804: rr = r->last->rule;
805:
1.87 kristaps 806: /*
807: * Clean out scope. If we've closed ourselves, then don't
808: * continue.
809: */
810:
811: roffnode_cleanscope(r);
1.82 kristaps 812:
1.106 kristaps 813: if (ROFF_MAX == (t = roff_parse(r, *bufp, &pos))) {
1.100 kristaps 814: if ('\\' == (*bufp)[pos] && '}' == (*bufp)[pos + 1])
815: return(roff_ccond
1.106 kristaps 816: (r, ROFF_ccond, bufp, szp,
1.100 kristaps 817: ln, pos, pos + 2, offs));
1.82 kristaps 818: return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.100 kristaps 819: }
1.82 kristaps 820:
821: /*
822: * A denied conditional must evaluate its children if and only
823: * if they're either structurally required (such as loops and
824: * conditionals) or a closing macro.
825: */
826: if (ROFFRULE_DENY == rr)
827: if ( ! (ROFFMAC_STRUCT & roffs[t].flags))
828: if (ROFF_ccond != t)
829: return(ROFF_IGN);
830:
831: assert(roffs[t].proc);
1.90 kristaps 832: return((*roffs[t].proc)(r, t, bufp, szp,
833: ln, ppos, pos, offs));
1.82 kristaps 834: }
835:
836:
837: /* ARGSUSED */
838: static enum rofferr
839: roff_cond_text(ROFF_ARGS)
1.78 kristaps 840: {
841: char *ep, *st;
1.82 kristaps 842: enum roffrule rr;
843:
844: rr = r->last->rule;
845:
846: /*
847: * We display the value of the text if out current evaluation
848: * scope permits us to do so.
849: */
1.100 kristaps 850:
851: /* FIXME: use roff_ccond? */
1.78 kristaps 852:
853: st = &(*bufp)[pos];
854: if (NULL == (ep = strstr(st, "\\}"))) {
855: roffnode_cleanscope(r);
1.82 kristaps 856: return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.78 kristaps 857: }
858:
1.86 kristaps 859: if (ep == st || (ep > st && '\\' != *(ep - 1)))
1.78 kristaps 860: roffnode_pop(r);
861:
862: roffnode_cleanscope(r);
1.82 kristaps 863: return(ROFFRULE_DENY == rr ? ROFF_IGN : ROFF_CONT);
1.74 kristaps 864: }
865:
866:
1.88 kristaps 867: static enum roffrule
868: roff_evalcond(const char *v, int *pos)
869: {
870:
871: switch (v[*pos]) {
872: case ('n'):
873: (*pos)++;
874: return(ROFFRULE_ALLOW);
875: case ('e'):
876: /* FALLTHROUGH */
877: case ('o'):
878: /* FALLTHROUGH */
879: case ('t'):
880: (*pos)++;
881: return(ROFFRULE_DENY);
882: default:
883: break;
884: }
885:
886: while (v[*pos] && ' ' != v[*pos])
887: (*pos)++;
888: return(ROFFRULE_DENY);
889: }
890:
1.75 kristaps 891: /* ARGSUSED */
1.74 kristaps 892: static enum rofferr
1.103 kristaps 893: roff_line_ignore(ROFF_ARGS)
1.89 kristaps 894: {
895:
896: return(ROFF_IGN);
897: }
898:
1.104 kristaps 899: /* ARGSUSED */
900: static enum rofferr
901: roff_line_error(ROFF_ARGS)
902: {
903:
904: (*r->msg)(MANDOCERR_REQUEST, r->data, ln, ppos, roffs[tok].name);
905: return(ROFF_IGN);
906: }
1.89 kristaps 907:
908: /* ARGSUSED */
909: static enum rofferr
1.82 kristaps 910: roff_cond(ROFF_ARGS)
1.74 kristaps 911: {
1.77 kristaps 912: int sv;
1.88 kristaps 913: enum roffrule rule;
1.74 kristaps 914:
1.82 kristaps 915: /* Stack overflow! */
916:
917: if (ROFF_ie == tok && r->rstackpos == RSTACK_MAX - 1) {
918: (*r->msg)(MANDOCERR_MEM, r->data, ln, ppos, NULL);
919: return(ROFF_ERR);
920: }
1.74 kristaps 921:
1.88 kristaps 922: /* First, evaluate the conditional. */
1.84 schwarze 923:
1.88 kristaps 924: if (ROFF_el == tok) {
925: /*
926: * An `.el' will get the value of the current rstack
927: * entry set in prior `ie' calls or defaults to DENY.
928: */
929: if (r->rstackpos < 0)
930: rule = ROFFRULE_DENY;
931: else
932: rule = r->rstack[r->rstackpos];
933: } else
934: rule = roff_evalcond(*bufp, &pos);
1.77 kristaps 935:
936: sv = pos;
1.88 kristaps 937:
1.75 kristaps 938: while (' ' == (*bufp)[pos])
939: pos++;
1.74 kristaps 940:
1.77 kristaps 941: /*
942: * Roff is weird. If we have just white-space after the
943: * conditional, it's considered the BODY and we exit without
944: * really doing anything. Warn about this. It's probably
945: * wrong.
946: */
1.88 kristaps 947:
1.77 kristaps 948: if ('\0' == (*bufp)[pos] && sv != pos) {
1.107 ! kristaps 949: (*r->msg)(MANDOCERR_NOARGS, r->data, ln, ppos, NULL);
! 950: return(ROFF_IGN);
1.77 kristaps 951: }
952:
1.106 kristaps 953: roffnode_push(r, tok, NULL, ln, ppos);
1.77 kristaps 954:
1.88 kristaps 955: r->last->rule = rule;
956:
957: ROFF_DEBUG("roff: cond: %s -> %s\n", roffs[tok].name,
958: ROFFRULE_ALLOW == rule ? "allow" : "deny");
1.82 kristaps 959:
1.84 schwarze 960: if (ROFF_ie == tok) {
1.82 kristaps 961: /*
962: * An if-else will put the NEGATION of the current
963: * evaluated conditional into the stack.
964: */
965: r->rstackpos++;
966: if (ROFFRULE_DENY == r->last->rule)
967: r->rstack[r->rstackpos] = ROFFRULE_ALLOW;
968: else
969: r->rstack[r->rstackpos] = ROFFRULE_DENY;
970: }
1.88 kristaps 971:
972: /* If the parent has false as its rule, then so do we. */
973:
974: if (r->last->parent && ROFFRULE_DENY == r->last->parent->rule) {
1.84 schwarze 975: r->last->rule = ROFFRULE_DENY;
1.88 kristaps 976: ROFF_DEBUG("roff: cond override: %s -> deny\n",
977: roffs[tok].name);
978: }
979:
980: /*
981: * Determine scope. If we're invoked with "\{" trailing the
982: * conditional, then we're in a multiline scope. Else our scope
983: * expires on the next line.
984: */
1.74 kristaps 985:
1.75 kristaps 986: r->last->endspan = 1;
987:
988: if ('\\' == (*bufp)[pos] && '{' == (*bufp)[pos + 1]) {
989: r->last->endspan = -1;
990: pos += 2;
1.88 kristaps 991: ROFF_DEBUG("roff: cond-scope: %s, multi-line\n",
992: roffs[tok].name);
993: } else
994: ROFF_DEBUG("roff: cond-scope: %s, one-line\n",
995: roffs[tok].name);
1.74 kristaps 996:
1.77 kristaps 997: /*
998: * If there are no arguments on the line, the next-line scope is
999: * assumed.
1000: */
1001:
1.75 kristaps 1002: if ('\0' == (*bufp)[pos])
1003: return(ROFF_IGN);
1.77 kristaps 1004:
1005: /* Otherwise re-run the roff parser after recalculating. */
1.74 kristaps 1006:
1.75 kristaps 1007: *offs = pos;
1008: return(ROFF_RERUN);
1.83 schwarze 1009: }
1010:
1011:
1012: /* ARGSUSED */
1013: static enum rofferr
1.92 schwarze 1014: roff_ds(ROFF_ARGS)
1015: {
1.96 kristaps 1016: char *name, *string;
1017:
1018: /*
1019: * A symbol is named by the first word following the macro
1020: * invocation up to a space. Its value is anything after the
1021: * name's trailing whitespace and optional double-quote. Thus,
1022: *
1023: * [.ds foo "bar " ]
1024: *
1025: * will have `bar " ' as its value.
1026: */
1.92 schwarze 1027:
1028: name = *bufp + pos;
1029: if ('\0' == *name)
1030: return(ROFF_IGN);
1031:
1032: string = name;
1.96 kristaps 1033: /* Read until end of name. */
1.92 schwarze 1034: while (*string && ' ' != *string)
1035: string++;
1.96 kristaps 1036:
1037: /* Nil-terminate name. */
1.92 schwarze 1038: if (*string)
1.96 kristaps 1039: *(string++) = '\0';
1040:
1041: /* Read past spaces. */
1042: while (*string && ' ' == *string)
1043: string++;
1044:
1045: /* Read passed initial double-quote. */
1.92 schwarze 1046: if (*string && '"' == *string)
1047: string++;
1048:
1.96 kristaps 1049: /* The rest is the value. */
1.106 kristaps 1050: roff_setstr(r, name, string, 0);
1.92 schwarze 1051: return(ROFF_IGN);
1052: }
1053:
1054:
1055: /* ARGSUSED */
1056: static enum rofferr
1.89 kristaps 1057: roff_nr(ROFF_ARGS)
1.83 schwarze 1058: {
1.89 kristaps 1059: const char *key, *val;
1.91 kristaps 1060: struct reg *rg;
1.89 kristaps 1061:
1062: key = &(*bufp)[pos];
1.91 kristaps 1063: rg = r->regs->regs;
1.89 kristaps 1064:
1065: /* Parse register request. */
1066: while ((*bufp)[pos] && ' ' != (*bufp)[pos])
1067: pos++;
1068:
1069: /*
1070: * Set our nil terminator. Because this line is going to be
1071: * ignored anyway, we can munge it as we please.
1072: */
1073: if ((*bufp)[pos])
1074: (*bufp)[pos++] = '\0';
1075:
1076: /* Skip whitespace to register token. */
1077: while ((*bufp)[pos] && ' ' == (*bufp)[pos])
1078: pos++;
1079:
1080: val = &(*bufp)[pos];
1081:
1082: /* Process register token. */
1083:
1084: if (0 == strcmp(key, "nS")) {
1.91 kristaps 1085: rg[(int)REG_nS].set = 1;
1086: if ( ! roff_parse_nat(val, &rg[(int)REG_nS].v.u))
1087: rg[(int)REG_nS].v.u = 0;
1.89 kristaps 1088:
1.91 kristaps 1089: ROFF_DEBUG("roff: register nS: %u\n",
1090: rg[(int)REG_nS].v.u);
1.89 kristaps 1091: } else
1092: ROFF_DEBUG("roff: ignoring register: %s\n", key);
1.83 schwarze 1093:
1094: return(ROFF_IGN);
1.92 schwarze 1095: }
1096:
1.105 kristaps 1097: /* ARGSUSED */
1098: static enum rofferr
1099: roff_so(ROFF_ARGS)
1100: {
1101: char *name;
1102:
1103: (*r->msg)(MANDOCERR_SO, r->data, ln, ppos, NULL);
1104:
1105: /*
1106: * Handle `so'. Be EXTREMELY careful, as we shouldn't be
1107: * opening anything that's not in our cwd or anything beneath
1108: * it. Thus, explicitly disallow traversing up the file-system
1109: * or using absolute paths.
1110: */
1111:
1112: name = *bufp + pos;
1113: if ('/' == *name || strstr(name, "../") || strstr(name, "/..")) {
1114: (*r->msg)(MANDOCERR_SOPATH, r->data, ln, pos, NULL);
1115: return(ROFF_ERR);
1116: }
1117:
1118: *offs = pos;
1119: return(ROFF_SO);
1120: }
1.92 schwarze 1121:
1.106 kristaps 1122: /* ARGSUSED */
1123: static enum rofferr
1124: roff_userdef(ROFF_ARGS)
1.99 kristaps 1125: {
1.106 kristaps 1126: const char *arg[9];
1127: char *cp, *n1, *n2;
1128: int i, quoted, pairs;
1129:
1130: /*
1131: * Collect pointers to macro argument strings
1132: * and null-terminate them.
1133: */
1134: cp = *bufp + pos;
1135: for (i = 0; i < 9; i++) {
1136: /* Quoting can only start with a new word. */
1137: if ('"' == *cp) {
1138: quoted = 1;
1139: cp++;
1140: } else
1141: quoted = 0;
1142: arg[i] = cp;
1143: for (pairs = 0; '\0' != *cp; cp++) {
1144: /* Unquoted arguments end at blanks. */
1145: if (0 == quoted) {
1146: if (' ' == *cp)
1147: break;
1148: continue;
1149: }
1150: /* After pairs of quotes, move left. */
1151: if (pairs)
1152: cp[-pairs] = cp[0];
1153: /* Pairs of quotes do not end words, ... */
1154: if ('"' == cp[0] && '"' == cp[1]) {
1155: pairs++;
1156: cp++;
1157: continue;
1158: }
1159: /* ... but solitary quotes do. */
1160: if ('"' != *cp)
1161: continue;
1162: if (pairs)
1163: cp[-pairs] = '\0';
1164: *cp = ' ';
1165: break;
1166: }
1167: /* Last argument; the remaining ones are empty strings. */
1168: if ('\0' == *cp)
1169: continue;
1170: /* Null-terminate argument and move to the next one. */
1171: *cp++ = '\0';
1172: while (' ' == *cp)
1173: cp++;
1174: }
1.99 kristaps 1175:
1.106 kristaps 1176: /*
1177: * Expand macro arguments.
1.99 kristaps 1178: */
1.106 kristaps 1179: *szp = 0;
1180: n1 = cp = mandoc_strdup(r->current_string);
1181: while (NULL != (cp = strstr(cp, "\\$"))) {
1182: i = cp[2] - '1';
1183: if (0 > i || 8 < i) {
1184: /* Not an argument invocation. */
1185: cp += 2;
1186: continue;
1187: }
1188:
1189: *szp = strlen(n1) - 3 + strlen(arg[i]) + 1;
1190: n2 = mandoc_malloc(*szp);
1191:
1192: strlcpy(n2, n1, (size_t)(cp - n1 + 1));
1193: strlcat(n2, arg[i], *szp);
1194: strlcat(n2, cp + 3, *szp);
1195:
1196: cp = n2 + (cp - n1);
1197: free(n1);
1198: n1 = n2;
1.99 kristaps 1199: }
1200:
1.106 kristaps 1201: /*
1202: * Replace the macro invocation
1203: * by the expanded macro.
1204: */
1205: free(*bufp);
1206: *bufp = n1;
1207: if (0 == *szp)
1208: *szp = strlen(*bufp) + 1;
1209:
1210: return(*szp > 1 && '\n' == (*bufp)[(int)*szp - 2] ?
1211: ROFF_REPARSE : ROFF_APPEND);
1.99 kristaps 1212: }
1213:
1.106 kristaps 1214: /*
1215: * Store *string into the user-defined string called *name.
1216: * In multiline mode, append to an existing entry and append '\n';
1217: * else replace the existing entry, if there is one.
1218: * To clear an existing entry, call with (*r, *name, NULL, 0).
1219: */
1.94 kristaps 1220: static void
1.106 kristaps 1221: roff_setstr(struct roff *r, const char *name, const char *string,
1222: int multiline)
1.92 schwarze 1223: {
1224: struct roffstr *n;
1.106 kristaps 1225: char *c;
1226: size_t oldch, newch;
1.92 schwarze 1227:
1.106 kristaps 1228: /* Search for an existing string with the same name. */
1.94 kristaps 1229: n = r->first_string;
1.92 schwarze 1230: while (n && strcmp(name, n->name))
1231: n = n->next;
1.94 kristaps 1232:
1233: if (NULL == n) {
1.106 kristaps 1234: /* Create a new string table entry. */
1.94 kristaps 1235: n = mandoc_malloc(sizeof(struct roffstr));
1.106 kristaps 1236: n->name = mandoc_strdup(name);
1237: n->string = NULL;
1.94 kristaps 1238: n->next = r->first_string;
1239: r->first_string = n;
1.106 kristaps 1240: } else if (0 == multiline) {
1241: /* In multiline mode, append; else replace. */
1.92 schwarze 1242: free(n->string);
1.106 kristaps 1243: n->string = NULL;
1244: }
1245:
1246: if (NULL == string)
1247: return;
1248:
1249: /*
1250: * One additional byte for the '\n' in multiline mode,
1251: * and one for the terminating '\0'.
1252: */
1253: newch = strlen(string) + (multiline ? 2 : 1);
1254: if (NULL == n->string) {
1255: n->string = mandoc_malloc(newch);
1256: *n->string = '\0';
1257: oldch = 0;
1258: } else {
1259: oldch = strlen(n->string);
1260: n->string = mandoc_realloc(n->string, oldch + newch);
1261: }
1262:
1263: /* Skip existing content in the destination buffer. */
1264: c = n->string + oldch;
1265:
1266: /* Append new content to the destination buffer. */
1267: while (*string) {
1268: /*
1269: * Rudimentary roff copy mode:
1270: * Handle escaped backslashes.
1271: */
1272: if ('\\' == *string && '\\' == *(string + 1))
1273: string++;
1274: *c++ = *string++;
1275: }
1.94 kristaps 1276:
1.106 kristaps 1277: /* Append terminating bytes. */
1278: if (multiline)
1279: *c++ = '\n';
1280: *c = '\0';
1.92 schwarze 1281: }
1282:
1283:
1.94 kristaps 1284: static const char *
1285: roff_getstrn(const struct roff *r, const char *name, size_t len)
1.92 schwarze 1286: {
1.94 kristaps 1287: const struct roffstr *n;
1.92 schwarze 1288:
1.94 kristaps 1289: n = r->first_string;
1.97 kristaps 1290: while (n && (strncmp(name, n->name, len) || '\0' != n->name[(int)len]))
1.92 schwarze 1291: n = n->next;
1.94 kristaps 1292:
1293: return(n ? n->string : NULL);
1.92 schwarze 1294: }
1295:
1.94 kristaps 1296:
1297: static void
1298: roff_freestr(struct roff *r)
1.92 schwarze 1299: {
1300: struct roffstr *n, *nn;
1301:
1.94 kristaps 1302: for (n = r->first_string; n; n = nn) {
1.92 schwarze 1303: free(n->name);
1304: free(n->string);
1305: nn = n->next;
1306: free(n);
1307: }
1.94 kristaps 1308:
1309: r->first_string = NULL;
1.74 kristaps 1310: }
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