1 /* $Id: read.c,v 1.211 2019/01/11 17:04:44 schwarze Exp $ */
3 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
4 * Copyright (c) 2010-2019 Ingo Schwarze <schwarze@openbsd.org>
5 * Copyright (c) 2010, 2012 Joerg Sonnenberger <joerg@netbsd.org>
7 * Permission to use, copy, modify, and distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
11 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHORS DISCLAIM ALL WARRANTIES
12 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
13 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR
14 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
15 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
16 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
17 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
21 #include <sys/types.h>
36 #include "mandoc_aux.h"
41 #include "mandoc_parse.h"
42 #include "libmandoc.h"
45 #define REPARSE_LIMIT 1000
48 struct roff *roff; /* roff parser (!NULL) */
49 struct roff_man *man; /* man parser */
50 struct buf *primary; /* buffer currently being parsed */
51 struct buf *secondary; /* copy of top level input */
52 struct buf *loop; /* open .while request line */
53 const char *os_s; /* default operating system */
54 int options; /* parser options */
55 int gzip; /* current input file is gzipped */
56 int filenc; /* encoding of the current file */
57 int reparse_count; /* finite interp. stack */
58 int line; /* line number in the file */
61 static void choose_parser(struct mparse *);
62 static void free_buf_list(struct buf *);
63 static void resize_buf(struct buf *, size_t);
64 static int mparse_buf_r(struct mparse *, struct buf, size_t, int);
65 static int read_whole_file(struct mparse *, int, struct buf *, int *);
66 static void mparse_end(struct mparse *);
70 resize_buf(struct buf *buf, size_t initial)
73 buf->sz = buf->sz > initial/2 ? 2 * buf->sz : initial;
74 buf->buf = mandoc_realloc(buf->buf, buf->sz);
78 free_buf_list(struct buf *buf)
91 choose_parser(struct mparse *curp)
97 * If neither command line arguments -mdoc or -man select
98 * a parser nor the roff parser found a .Dd or .TH macro
99 * yet, look ahead in the main input buffer.
102 if ((format = roff_getformat(curp->roff)) == 0) {
103 cp = curp->primary->buf;
104 ep = cp + curp->primary->sz;
106 if (*cp == '.' || *cp == '\'') {
108 if (cp[0] == 'D' && cp[1] == 'd') {
109 format = MPARSE_MDOC;
112 if (cp[0] == 'T' && cp[1] == 'H') {
117 cp = memchr(cp, '\n', ep - cp);
124 if (format == MPARSE_MDOC) {
125 curp->man->meta.macroset = MACROSET_MDOC;
126 if (curp->man->mdocmac == NULL)
127 curp->man->mdocmac = roffhash_alloc(MDOC_Dd, MDOC_MAX);
129 curp->man->meta.macroset = MACROSET_MAN;
130 if (curp->man->manmac == NULL)
131 curp->man->manmac = roffhash_alloc(MAN_TH, MAN_MAX);
133 curp->man->meta.first->tok = TOKEN_NONE;
137 * Main parse routine for a buffer.
138 * It assumes encoding and line numbering are already set up.
139 * It can recurse directly (for invocations of user-defined
140 * macros, inline equations, and input line traps)
141 * and indirectly (for .so file inclusion).
144 mparse_buf_r(struct mparse *curp, struct buf blk, size_t i, int start)
147 struct buf *firstln, *lastln, *thisln, *loop;
149 size_t pos; /* byte number in the ln buffer */
150 int line_result, result;
152 int lnn; /* line number in the real file */
154 int inloop; /* Saw .while on this level. */
158 ln.buf = mandoc_malloc(ln.sz);
160 firstln = loop = NULL;
166 while (i < blk.sz && (blk.buf[i] != '\0' || pos != 0)) {
169 curp->reparse_count = 0;
172 curp->filenc & MPARSE_UTF8 &&
173 curp->filenc & MPARSE_LATIN1)
174 curp->filenc = preconv_cue(&blk, i);
177 while (i < blk.sz && (start || blk.buf[i] != '\0')) {
180 * When finding an unescaped newline character,
181 * leave the character loop to process the line.
182 * Skip a preceding carriage return, if any.
185 if ('\r' == blk.buf[i] && i + 1 < blk.sz &&
186 '\n' == blk.buf[i + 1])
188 if ('\n' == blk.buf[i]) {
195 * Make sure we have space for the worst
196 * case of 12 bytes: "\\[u10ffff]\n\0"
199 if (pos + 12 > ln.sz)
200 resize_buf(&ln, 256);
203 * Encode 8-bit input.
208 if ( ! (curp->filenc && preconv_encode(
209 &blk, &i, &ln, &pos, &curp->filenc))) {
210 mandoc_msg(MANDOCERR_CHAR_BAD,
211 curp->line, pos, "0x%x", c);
219 * Exclude control characters.
222 if (c == 0x7f || (c < 0x20 && c != 0x09)) {
223 mandoc_msg(c == 0x00 || c == 0x04 ||
224 c > 0x0a ? MANDOCERR_CHAR_BAD :
225 MANDOCERR_CHAR_UNSUPP,
226 curp->line, pos, "0x%x", c);
233 ln.buf[pos++] = blk.buf[i++];
238 * Maintain a lookaside buffer of all lines.
239 * parsed from this input source.
242 thisln = mandoc_malloc(sizeof(*thisln));
243 thisln->buf = mandoc_strdup(ln.buf);
244 thisln->sz = strlen(ln.buf) + 1;
246 if (firstln == NULL) {
247 firstln = lastln = thisln;
248 if (curp->secondary == NULL)
249 curp->secondary = firstln;
251 lastln->next = thisln;
255 /* XXX Ugly hack to mark the end of the input. */
257 if (i == blk.sz || blk.buf[i] == '\0') {
258 ln.buf[pos++] = '\n';
263 * A significant amount of complexity is contained by
264 * the roff preprocessor. It's line-oriented but can be
265 * expressed on one line, so we need at times to
266 * readjust our starting point and re-run it. The roff
267 * preprocessor can also readjust the buffers with new
268 * data, so we pass them in wholesale.
273 line_result = roff_parseln(curp->roff, curp->line, &ln, &of);
275 /* Process options. */
277 if (line_result & ROFF_APPEND)
278 assert(line_result == (ROFF_IGN | ROFF_APPEND));
280 if (line_result & ROFF_USERCALL)
281 assert((line_result & ROFF_MASK) == ROFF_REPARSE);
283 if (line_result & ROFF_USERRET) {
284 assert(line_result == (ROFF_IGN | ROFF_USERRET));
286 /* Return from the current macro. */
287 result = ROFF_USERRET;
292 switch (line_result & ROFF_LOOPMASK) {
296 if (curp->loop != NULL) {
297 if (loop == curp->loop)
299 mandoc_msg(MANDOCERR_WHILE_NEST,
300 curp->line, pos, NULL);
308 if (curp->loop == NULL) {
309 mandoc_msg(MANDOCERR_WHILE_FAIL,
310 curp->line, pos, NULL);
314 mandoc_msg(MANDOCERR_WHILE_INTO,
315 curp->line, pos, NULL);
316 curp->loop = loop = NULL;
319 if (line_result & ROFF_LOOPCONT)
322 curp->loop = loop = NULL;
330 /* Process the main instruction from the roff parser. */
332 switch (line_result & ROFF_MASK) {
336 if (curp->man->meta.macroset == MACROSET_NONE)
338 if ((curp->man->meta.macroset == MACROSET_MDOC ?
339 mdoc_parseln(curp->man, curp->line, ln.buf, of) :
340 man_parseln(curp->man, curp->line, ln.buf, of)
347 if (++curp->reparse_count > REPARSE_LIMIT) {
348 /* Abort and return to the top level. */
350 mandoc_msg(MANDOCERR_ROFFLOOP,
351 curp->line, pos, NULL);
354 result = mparse_buf_r(curp, ln, of, 0);
355 if (line_result & ROFF_USERCALL) {
356 roff_userret(curp->roff);
357 /* Continue normally. */
358 if (result & ROFF_USERRET)
361 if (start == 0 && result != ROFF_CONT)
365 if ( ! (curp->options & MPARSE_SO) &&
366 (i >= blk.sz || blk.buf[i] == '\0')) {
367 curp->man->meta.sodest =
368 mandoc_strdup(ln.buf + of);
371 if ((fd = mparse_open(curp, ln.buf + of)) != -1) {
372 mparse_readfd(curp, fd, ln.buf + of);
375 mandoc_msg(MANDOCERR_SO_FAIL,
376 curp->line, of, ".so %s: %s",
377 ln.buf + of, strerror(errno));
378 ln.sz = mandoc_asprintf(&cp,
379 ".sp\nSee the file %s.\n.sp",
384 mparse_buf_r(curp, ln, of, 0);
391 /* Start the next input line. */
394 (line_result & ROFF_LOOPMASK) == ROFF_IGN)
398 if ((line_result & ROFF_APPEND) == 0)
400 if (ln.sz < loop->sz)
401 resize_buf(&ln, loop->sz);
402 (void)strlcat(ln.buf, loop->buf, ln.sz);
407 pos = (line_result & ROFF_APPEND) ? strlen(ln.buf) : 0;
411 if (result != ROFF_USERRET)
412 mandoc_msg(MANDOCERR_WHILE_OUTOF,
413 curp->line, pos, NULL);
417 if (firstln != curp->secondary)
418 free_buf_list(firstln);
423 read_whole_file(struct mparse *curp, int fd, struct buf *fb, int *with_mmap)
429 int gzerrnum, retval;
431 if (fstat(fd, &st) == -1) {
432 mandoc_msg(MANDOCERR_FILE, 0, 0,
433 "fstat: %s", strerror(errno));
438 * If we're a regular file, try just reading in the whole entry
439 * via mmap(). This is faster than reading it into blocks, and
440 * since each file is only a few bytes to begin with, I'm not
441 * concerned that this is going to tank any machines.
444 if (curp->gzip == 0 && S_ISREG(st.st_mode)) {
445 if (st.st_size > 0x7fffffff) {
446 mandoc_msg(MANDOCERR_TOOLARGE, 0, 0, NULL);
450 fb->sz = (size_t)st.st_size;
451 fb->buf = mmap(NULL, fb->sz, PROT_READ, MAP_SHARED, fd, 0);
452 if (fb->buf != MAP_FAILED)
458 * Duplicating the file descriptor is required
459 * because we will have to call gzclose(3)
460 * to free memory used internally by zlib,
461 * but that will also close the file descriptor,
462 * which this function must not do.
464 if ((fd = dup(fd)) == -1) {
465 mandoc_msg(MANDOCERR_FILE, 0, 0,
466 "dup: %s", strerror(errno));
469 if ((gz = gzdopen(fd, "rb")) == NULL) {
470 mandoc_msg(MANDOCERR_FILE, 0, 0,
471 "gzdopen: %s", strerror(errno));
479 * If this isn't a regular file (like, say, stdin), then we must
480 * go the old way and just read things in bit by bit.
490 if (fb->sz == (1U << 31)) {
491 mandoc_msg(MANDOCERR_TOOLARGE, 0, 0, NULL);
494 resize_buf(fb, 65536);
497 gzread(gz, fb->buf + (int)off, fb->sz - off) :
498 read(fd, fb->buf + (int)off, fb->sz - off);
506 (void)gzerror(gz, &gzerrnum);
507 mandoc_msg(MANDOCERR_FILE, 0, 0, "read: %s",
508 curp->gzip && gzerrnum != Z_ERRNO ?
509 zError(gzerrnum) : strerror(errno));
515 if (curp->gzip && (gzerrnum = gzclose(gz)) != Z_OK)
516 mandoc_msg(MANDOCERR_FILE, 0, 0, "gzclose: %s",
517 gzerrnum == Z_ERRNO ? strerror(errno) :
527 mparse_end(struct mparse *curp)
529 if (curp->man->meta.macroset == MACROSET_NONE)
530 curp->man->meta.macroset = MACROSET_MAN;
531 if (curp->man->meta.macroset == MACROSET_MDOC)
532 mdoc_endparse(curp->man);
534 man_endparse(curp->man);
535 roff_endparse(curp->roff);
539 * Read the whole file into memory and call the parsers.
540 * Called recursively when an .so request is encountered.
543 mparse_readfd(struct mparse *curp, int fd, const char *filename)
545 static int recursion_depth;
548 struct buf *save_primary;
549 const char *save_filename;
551 int save_filenc, save_lineno;
554 if (recursion_depth > 64) {
555 mandoc_msg(MANDOCERR_ROFFLOOP, curp->line, 0, NULL);
558 if (read_whole_file(curp, fd, &blk, &with_mmap) == 0)
562 * Save some properties of the parent file.
565 save_primary = curp->primary;
566 save_filenc = curp->filenc;
567 save_lineno = curp->line;
568 save_filename = mandoc_msg_getinfilename();
570 curp->primary = &blk;
571 curp->filenc = curp->options & (MPARSE_UTF8 | MPARSE_LATIN1);
573 mandoc_msg_setinfilename(filename);
575 /* Skip an UTF-8 byte order mark. */
576 if (curp->filenc & MPARSE_UTF8 && blk.sz > 2 &&
577 (unsigned char)blk.buf[0] == 0xef &&
578 (unsigned char)blk.buf[1] == 0xbb &&
579 (unsigned char)blk.buf[2] == 0xbf) {
581 curp->filenc &= ~MPARSE_LATIN1;
586 mparse_buf_r(curp, blk, offset, 1);
587 if (--recursion_depth == 0)
591 * Clean up and restore saved parent properties.
595 munmap(blk.buf, blk.sz);
599 curp->primary = save_primary;
600 curp->filenc = save_filenc;
601 curp->line = save_lineno;
602 if (save_filename != NULL)
603 mandoc_msg_setinfilename(save_filename);
607 mparse_open(struct mparse *curp, const char *file)
612 cp = strrchr(file, '.');
613 curp->gzip = (cp != NULL && ! strcmp(cp + 1, "gz"));
615 /* First try to use the filename as it is. */
617 if ((fd = open(file, O_RDONLY)) != -1)
621 * If that doesn't work and the filename doesn't
622 * already end in .gz, try appending .gz.
627 mandoc_asprintf(&cp, "%s.gz", file);
628 fd = open(cp, O_RDONLY);
637 /* Neither worked, give up. */
643 mparse_alloc(int options, enum mandoc_os os_e, const char *os_s)
647 curp = mandoc_calloc(1, sizeof(struct mparse));
649 curp->options = options;
652 curp->roff = roff_alloc(options);
653 curp->man = roff_man_alloc(curp->roff, curp->os_s,
654 curp->options & MPARSE_QUICK ? 1 : 0);
655 if (curp->options & MPARSE_MDOC) {
656 curp->man->meta.macroset = MACROSET_MDOC;
657 if (curp->man->mdocmac == NULL)
658 curp->man->mdocmac = roffhash_alloc(MDOC_Dd, MDOC_MAX);
659 } else if (curp->options & MPARSE_MAN) {
660 curp->man->meta.macroset = MACROSET_MAN;
661 if (curp->man->manmac == NULL)
662 curp->man->manmac = roffhash_alloc(MAN_TH, MAN_MAX);
664 curp->man->meta.first->tok = TOKEN_NONE;
665 curp->man->meta.os_e = os_e;
670 mparse_reset(struct mparse *curp)
672 roff_reset(curp->roff);
673 roff_man_reset(curp->man);
674 free_buf_list(curp->secondary);
675 curp->secondary = NULL;
680 mparse_free(struct mparse *curp)
682 roffhash_free(curp->man->mdocmac);
683 roffhash_free(curp->man->manmac);
684 roff_man_free(curp->man);
685 roff_free(curp->roff);
686 free_buf_list(curp->secondary);
691 mparse_result(struct mparse *curp)
693 roff_state_reset(curp->man);
694 if (curp->options & MPARSE_VALIDATE) {
695 if (curp->man->meta.macroset == MACROSET_MDOC)
696 mdoc_validate(curp->man);
698 man_validate(curp->man);
700 return &curp->man->meta;
704 mparse_copy(const struct mparse *p)
708 for (buf = p->secondary; buf != NULL; buf = buf->next)