1 /* $OpenBSD: read.c,v 1.192 2022/05/19 14:47:47 schwarze Exp $ */
2 /*
3 * Copyright (c) 2010-2020 Ingo Schwarze <schwarze@openbsd.org>
4 * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
5 * Copyright (c) 2010, 2012 Joerg Sonnenberger <joerg@netbsd.org>
6 *
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.
10 *
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.
18 *
19 * Top-level functions of the mandoc(3) parser:
20 * Parser and input encoding selection, decompression,
21 * handling of input bytes, characters, lines, and files,
22 * handling of roff(7) loops and file inclusion,
23 * and steering of the various parsers.
24 */
25 #include <sys/types.h>
26 #include <sys/mman.h>
27 #include <sys/stat.h>
28
29 #include <assert.h>
30 #include <ctype.h>
31 #include <errno.h>
32 #include <fcntl.h>
33 #include <stdarg.h>
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37 #include <unistd.h>
38 #include <zlib.h>
39
40 #include "mandoc_aux.h"
41 #include "mandoc.h"
42 #include "roff.h"
43 #include "mdoc.h"
44 #include "man.h"
45 #include "mandoc_parse.h"
46 #include "libmandoc.h"
47 #include "roff_int.h"
48 #include "tag.h"
49
50 #define REPARSE_LIMIT 1000
51
52 struct mparse {
53 struct roff *roff; /* roff parser (!NULL) */
54 struct roff_man *man; /* man parser */
55 struct buf *primary; /* buffer currently being parsed */
56 struct buf *secondary; /* copy of top level input */
57 struct buf *loop; /* open .while request line */
58 const char *os_s; /* default operating system */
59 int options; /* parser options */
60 int gzip; /* current input file is gzipped */
61 int filenc; /* encoding of the current file */
62 int reparse_count; /* finite interp. stack */
63 int line; /* line number in the file */
64 };
65
66 static void choose_parser(struct mparse *);
67 static void free_buf_list(struct buf *);
68 static void resize_buf(struct buf *, size_t);
69 static int mparse_buf_r(struct mparse *, struct buf, size_t, int);
70 static int read_whole_file(struct mparse *, int, struct buf *, int *);
71 static void mparse_end(struct mparse *);
72
73
74 static void
resize_buf(struct buf * buf,size_t initial)75 resize_buf(struct buf *buf, size_t initial)
76 {
77
78 buf->sz = buf->sz > initial/2 ? 2 * buf->sz : initial;
79 buf->buf = mandoc_realloc(buf->buf, buf->sz);
80 }
81
82 static void
free_buf_list(struct buf * buf)83 free_buf_list(struct buf *buf)
84 {
85 struct buf *tmp;
86
87 while (buf != NULL) {
88 tmp = buf;
89 buf = tmp->next;
90 free(tmp->buf);
91 free(tmp);
92 }
93 }
94
95 static void
choose_parser(struct mparse * curp)96 choose_parser(struct mparse *curp)
97 {
98 char *cp, *ep;
99 int format;
100
101 /*
102 * If neither command line arguments -mdoc or -man select
103 * a parser nor the roff parser found a .Dd or .TH macro
104 * yet, look ahead in the main input buffer.
105 */
106
107 if ((format = roff_getformat(curp->roff)) == 0) {
108 cp = curp->primary->buf;
109 ep = cp + curp->primary->sz;
110 while (cp < ep) {
111 if (*cp == '.' || *cp == '\'') {
112 cp++;
113 if (cp[0] == 'D' && cp[1] == 'd') {
114 format = MPARSE_MDOC;
115 break;
116 }
117 if (cp[0] == 'T' && cp[1] == 'H') {
118 format = MPARSE_MAN;
119 break;
120 }
121 }
122 cp = memchr(cp, '\n', ep - cp);
123 if (cp == NULL)
124 break;
125 cp++;
126 }
127 }
128
129 if (format == MPARSE_MDOC) {
130 curp->man->meta.macroset = MACROSET_MDOC;
131 if (curp->man->mdocmac == NULL)
132 curp->man->mdocmac = roffhash_alloc(MDOC_Dd, MDOC_MAX);
133 } else {
134 curp->man->meta.macroset = MACROSET_MAN;
135 if (curp->man->manmac == NULL)
136 curp->man->manmac = roffhash_alloc(MAN_TH, MAN_MAX);
137 }
138 curp->man->meta.first->tok = TOKEN_NONE;
139 }
140
141 /*
142 * Main parse routine for a buffer.
143 * It assumes encoding and line numbering are already set up.
144 * It can recurse directly (for invocations of user-defined
145 * macros, inline equations, and input line traps)
146 * and indirectly (for .so file inclusion).
147 */
148 static int
mparse_buf_r(struct mparse * curp,struct buf blk,size_t i,int start)149 mparse_buf_r(struct mparse *curp, struct buf blk, size_t i, int start)
150 {
151 struct buf ln;
152 struct buf *firstln, *lastln, *thisln, *loop;
153 char *cp;
154 size_t pos; /* byte number in the ln buffer */
155 size_t spos; /* at the start of the current line parse */
156 int line_result, result;
157 int of;
158 int lnn; /* line number in the real file */
159 int fd;
160 int inloop; /* Saw .while on this level. */
161 unsigned char c;
162
163 ln.sz = 256;
164 ln.buf = mandoc_malloc(ln.sz);
165 ln.next = NULL;
166 firstln = lastln = loop = NULL;
167 lnn = curp->line;
168 pos = 0;
169 inloop = 0;
170 result = ROFF_CONT;
171
172 while (i < blk.sz && (blk.buf[i] != '\0' || pos != 0)) {
173 if (start) {
174 curp->line = lnn;
175 curp->reparse_count = 0;
176
177 if (lnn < 3 &&
178 curp->filenc & MPARSE_UTF8 &&
179 curp->filenc & MPARSE_LATIN1)
180 curp->filenc = preconv_cue(&blk, i);
181 }
182 spos = pos;
183
184 while (i < blk.sz && (start || blk.buf[i] != '\0')) {
185
186 /*
187 * When finding an unescaped newline character,
188 * leave the character loop to process the line.
189 * Skip a preceding carriage return, if any.
190 */
191
192 if ('\r' == blk.buf[i] && i + 1 < blk.sz &&
193 '\n' == blk.buf[i + 1])
194 ++i;
195 if ('\n' == blk.buf[i]) {
196 ++i;
197 ++lnn;
198 break;
199 }
200
201 /*
202 * Make sure we have space for the worst
203 * case of 12 bytes: "\\[u10ffff]\n\0"
204 */
205
206 if (pos + 12 > ln.sz)
207 resize_buf(&ln, 256);
208
209 /*
210 * Encode 8-bit input.
211 */
212
213 c = blk.buf[i];
214 if (c & 0x80) {
215 if ( ! (curp->filenc && preconv_encode(
216 &blk, &i, &ln, &pos, &curp->filenc))) {
217 mandoc_msg(MANDOCERR_CHAR_BAD,
218 curp->line, pos, "0x%x", c);
219 ln.buf[pos++] = '?';
220 i++;
221 }
222 continue;
223 }
224
225 /*
226 * Exclude control characters.
227 */
228
229 if (c == 0x7f || (c < 0x20 && c != 0x09)) {
230 mandoc_msg(c == 0x00 || c == 0x04 ||
231 c > 0x0a ? MANDOCERR_CHAR_BAD :
232 MANDOCERR_CHAR_UNSUPP,
233 curp->line, pos, "0x%x", c);
234 i++;
235 if (c != '\r')
236 ln.buf[pos++] = '?';
237 continue;
238 }
239
240 ln.buf[pos++] = blk.buf[i++];
241 }
242 ln.buf[pos] = '\0';
243
244 /*
245 * Maintain a lookaside buffer of all lines.
246 * parsed from this input source.
247 */
248
249 thisln = mandoc_malloc(sizeof(*thisln));
250 thisln->buf = mandoc_strdup(ln.buf);
251 thisln->sz = strlen(ln.buf) + 1;
252 thisln->next = NULL;
253 if (firstln == NULL) {
254 firstln = lastln = thisln;
255 if (curp->secondary == NULL)
256 curp->secondary = firstln;
257 } else {
258 lastln->next = thisln;
259 lastln = thisln;
260 }
261
262 /*
263 * XXX Ugly hack to mark the end of the input,
264 * such that the function roff_parse_comment()
265 * doesn't attempt to append another line if the
266 * last input line ends with an escape character.
267 */
268
269 if (i == blk.sz || blk.buf[i] == '\0') {
270 if (pos + 2 > ln.sz)
271 resize_buf(&ln, 256);
272 ln.buf[pos++] = '\n';
273 ln.buf[pos] = '\0';
274 }
275
276 /*
277 * A significant amount of complexity is contained by
278 * the roff preprocessor. It's line-oriented but can be
279 * expressed on one line, so we need at times to
280 * readjust our starting point and re-run it. The roff
281 * preprocessor can also readjust the buffers with new
282 * data, so we pass them in wholesale.
283 */
284
285 of = 0;
286 rerun:
287 line_result = roff_parseln(curp->roff, curp->line,
288 &ln, &of, start && spos == 0 ? pos : 0);
289
290 /* Process options. */
291
292 if (line_result & ROFF_APPEND)
293 assert(line_result == (ROFF_IGN | ROFF_APPEND));
294
295 if (line_result & ROFF_USERCALL)
296 assert((line_result & ROFF_MASK) == ROFF_REPARSE);
297
298 if (line_result & ROFF_USERRET) {
299 assert(line_result == (ROFF_IGN | ROFF_USERRET));
300 if (start == 0) {
301 /* Return from the current macro. */
302 result = ROFF_USERRET;
303 goto out;
304 }
305 }
306
307 switch (line_result & ROFF_LOOPMASK) {
308 case ROFF_IGN:
309 break;
310 case ROFF_WHILE:
311 if (curp->loop != NULL) {
312 if (loop == curp->loop)
313 break;
314 mandoc_msg(MANDOCERR_WHILE_NEST,
315 curp->line, pos, NULL);
316 }
317 curp->loop = thisln;
318 loop = NULL;
319 inloop = 1;
320 break;
321 case ROFF_LOOPCONT:
322 case ROFF_LOOPEXIT:
323 if (curp->loop == NULL) {
324 mandoc_msg(MANDOCERR_WHILE_FAIL,
325 curp->line, pos, NULL);
326 break;
327 }
328 if (inloop == 0) {
329 mandoc_msg(MANDOCERR_WHILE_INTO,
330 curp->line, pos, NULL);
331 curp->loop = loop = NULL;
332 break;
333 }
334 if (line_result & ROFF_LOOPCONT)
335 loop = curp->loop;
336 else {
337 curp->loop = loop = NULL;
338 inloop = 0;
339 }
340 break;
341 default:
342 abort();
343 }
344
345 /* Process the main instruction from the roff parser. */
346
347 switch (line_result & ROFF_MASK) {
348 case ROFF_IGN:
349 break;
350 case ROFF_CONT:
351 if (curp->man->meta.macroset == MACROSET_NONE)
352 choose_parser(curp);
353 if ((curp->man->meta.macroset == MACROSET_MDOC ?
354 mdoc_parseln(curp->man, curp->line, ln.buf, of) :
355 man_parseln(curp->man, curp->line, ln.buf, of)
356 ) == 2)
357 goto out;
358 break;
359 case ROFF_RERUN:
360 goto rerun;
361 case ROFF_REPARSE:
362 if (++curp->reparse_count > REPARSE_LIMIT) {
363 /* Abort and return to the top level. */
364 result = ROFF_IGN;
365 mandoc_msg(MANDOCERR_ROFFLOOP,
366 curp->line, pos, NULL);
367 goto out;
368 }
369 result = mparse_buf_r(curp, ln, of, 0);
370 if (line_result & ROFF_USERCALL) {
371 roff_userret(curp->roff);
372 /* Continue normally. */
373 if (result & ROFF_USERRET)
374 result = ROFF_CONT;
375 }
376 if (start == 0 && result != ROFF_CONT)
377 goto out;
378 break;
379 case ROFF_SO:
380 if ( ! (curp->options & MPARSE_SO) &&
381 (i >= blk.sz || blk.buf[i] == '\0')) {
382 curp->man->meta.sodest =
383 mandoc_strdup(ln.buf + of);
384 goto out;
385 }
386 if ((fd = mparse_open(curp, ln.buf + of)) != -1) {
387 mparse_readfd(curp, fd, ln.buf + of);
388 close(fd);
389 } else {
390 mandoc_msg(MANDOCERR_SO_FAIL,
391 curp->line, of, ".so %s: %s",
392 ln.buf + of, strerror(errno));
393 ln.sz = mandoc_asprintf(&cp,
394 ".sp\nSee the file %s.\n.sp",
395 ln.buf + of);
396 free(ln.buf);
397 ln.buf = cp;
398 of = 0;
399 mparse_buf_r(curp, ln, of, 0);
400 }
401 break;
402 default:
403 abort();
404 }
405
406 /* Start the next input line. */
407
408 if (loop != NULL &&
409 (line_result & ROFF_LOOPMASK) == ROFF_IGN)
410 loop = loop->next;
411
412 if (loop != NULL) {
413 if ((line_result & ROFF_APPEND) == 0)
414 *ln.buf = '\0';
415 if (ln.sz < loop->sz)
416 resize_buf(&ln, loop->sz);
417 (void)strlcat(ln.buf, loop->buf, ln.sz);
418 of = 0;
419 goto rerun;
420 }
421
422 pos = (line_result & ROFF_APPEND) ? strlen(ln.buf) : 0;
423 }
424 out:
425 if (inloop) {
426 if (result != ROFF_USERRET)
427 mandoc_msg(MANDOCERR_WHILE_OUTOF,
428 curp->line, pos, NULL);
429 curp->loop = NULL;
430 }
431 free(ln.buf);
432 if (firstln != curp->secondary)
433 free_buf_list(firstln);
434 return result;
435 }
436
437 static int
read_whole_file(struct mparse * curp,int fd,struct buf * fb,int * with_mmap)438 read_whole_file(struct mparse *curp, int fd, struct buf *fb, int *with_mmap)
439 {
440 struct stat st;
441 gzFile gz;
442 size_t off;
443 ssize_t ssz;
444 int gzerrnum, retval;
445
446 if (fstat(fd, &st) == -1) {
447 mandoc_msg(MANDOCERR_FSTAT, 0, 0, "%s", strerror(errno));
448 return -1;
449 }
450
451 /*
452 * If we're a regular file, try just reading in the whole entry
453 * via mmap(). This is faster than reading it into blocks, and
454 * since each file is only a few bytes to begin with, I'm not
455 * concerned that this is going to tank any machines.
456 */
457
458 if (curp->gzip == 0 && S_ISREG(st.st_mode)) {
459 if (st.st_size > 0x7fffffff) {
460 mandoc_msg(MANDOCERR_TOOLARGE, 0, 0, NULL);
461 return -1;
462 }
463 *with_mmap = 1;
464 fb->sz = (size_t)st.st_size;
465 fb->buf = mmap(NULL, fb->sz, PROT_READ, MAP_SHARED, fd, 0);
466 if (fb->buf != MAP_FAILED)
467 return 0;
468 }
469
470 if (curp->gzip) {
471 /*
472 * Duplicating the file descriptor is required
473 * because we will have to call gzclose(3)
474 * to free memory used internally by zlib,
475 * but that will also close the file descriptor,
476 * which this function must not do.
477 */
478 if ((fd = dup(fd)) == -1) {
479 mandoc_msg(MANDOCERR_DUP, 0, 0,
480 "%s", strerror(errno));
481 return -1;
482 }
483 if ((gz = gzdopen(fd, "rb")) == NULL) {
484 mandoc_msg(MANDOCERR_GZDOPEN, 0, 0,
485 "%s", strerror(errno));
486 close(fd);
487 return -1;
488 }
489 } else
490 gz = NULL;
491
492 /*
493 * If this isn't a regular file (like, say, stdin), then we must
494 * go the old way and just read things in bit by bit.
495 */
496
497 *with_mmap = 0;
498 off = 0;
499 retval = -1;
500 fb->sz = 0;
501 fb->buf = NULL;
502 for (;;) {
503 if (off == fb->sz) {
504 if (fb->sz == (1U << 31)) {
505 mandoc_msg(MANDOCERR_TOOLARGE, 0, 0, NULL);
506 break;
507 }
508 resize_buf(fb, 65536);
509 }
510 ssz = curp->gzip ?
511 gzread(gz, fb->buf + (int)off, fb->sz - off) :
512 read(fd, fb->buf + (int)off, fb->sz - off);
513 if (ssz == 0) {
514 fb->sz = off;
515 retval = 0;
516 break;
517 }
518 if (ssz == -1) {
519 if (curp->gzip)
520 (void)gzerror(gz, &gzerrnum);
521 mandoc_msg(MANDOCERR_READ, 0, 0, "%s",
522 curp->gzip && gzerrnum != Z_ERRNO ?
523 zError(gzerrnum) : strerror(errno));
524 break;
525 }
526 off += (size_t)ssz;
527 }
528
529 if (curp->gzip && (gzerrnum = gzclose(gz)) != Z_OK)
530 mandoc_msg(MANDOCERR_GZCLOSE, 0, 0, "%s",
531 gzerrnum == Z_ERRNO ? strerror(errno) :
532 zError(gzerrnum));
533 if (retval == -1) {
534 free(fb->buf);
535 fb->buf = NULL;
536 }
537 return retval;
538 }
539
540 static void
mparse_end(struct mparse * curp)541 mparse_end(struct mparse *curp)
542 {
543 if (curp->man->meta.macroset == MACROSET_NONE)
544 curp->man->meta.macroset = MACROSET_MAN;
545 if (curp->man->meta.macroset == MACROSET_MDOC)
546 mdoc_endparse(curp->man);
547 else
548 man_endparse(curp->man);
549 roff_endparse(curp->roff);
550 }
551
552 /*
553 * Read the whole file into memory and call the parsers.
554 * Called recursively when an .so request is encountered.
555 */
556 void
mparse_readfd(struct mparse * curp,int fd,const char * filename)557 mparse_readfd(struct mparse *curp, int fd, const char *filename)
558 {
559 static int recursion_depth;
560
561 struct buf blk;
562 struct buf *save_primary;
563 const char *save_filename, *cp;
564 size_t offset;
565 int save_filenc, save_lineno;
566 int with_mmap;
567
568 if (recursion_depth > 64) {
569 mandoc_msg(MANDOCERR_ROFFLOOP, curp->line, 0, NULL);
570 return;
571 } else if (recursion_depth == 0 &&
572 (cp = strrchr(filename, '.')) != NULL &&
573 cp[1] >= '1' && cp[1] <= '9')
574 curp->man->filesec = cp[1];
575 else
576 curp->man->filesec = '\0';
577
578 if (read_whole_file(curp, fd, &blk, &with_mmap) == -1)
579 return;
580
581 /*
582 * Save some properties of the parent file.
583 */
584
585 save_primary = curp->primary;
586 save_filenc = curp->filenc;
587 save_lineno = curp->line;
588 save_filename = mandoc_msg_getinfilename();
589
590 curp->primary = &blk;
591 curp->filenc = curp->options & (MPARSE_UTF8 | MPARSE_LATIN1);
592 curp->line = 1;
593 mandoc_msg_setinfilename(filename);
594
595 /* Skip an UTF-8 byte order mark. */
596 if (curp->filenc & MPARSE_UTF8 && blk.sz > 2 &&
597 (unsigned char)blk.buf[0] == 0xef &&
598 (unsigned char)blk.buf[1] == 0xbb &&
599 (unsigned char)blk.buf[2] == 0xbf) {
600 offset = 3;
601 curp->filenc &= ~MPARSE_LATIN1;
602 } else
603 offset = 0;
604
605 recursion_depth++;
606 mparse_buf_r(curp, blk, offset, 1);
607 if (--recursion_depth == 0)
608 mparse_end(curp);
609
610 /*
611 * Clean up and restore saved parent properties.
612 */
613
614 if (with_mmap)
615 munmap(blk.buf, blk.sz);
616 else
617 free(blk.buf);
618
619 curp->primary = save_primary;
620 curp->filenc = save_filenc;
621 curp->line = save_lineno;
622 if (save_filename != NULL)
623 mandoc_msg_setinfilename(save_filename);
624 }
625
626 int
mparse_open(struct mparse * curp,const char * file)627 mparse_open(struct mparse *curp, const char *file)
628 {
629 char *cp;
630 int fd, save_errno;
631
632 cp = strrchr(file, '.');
633 curp->gzip = (cp != NULL && ! strcmp(cp + 1, "gz"));
634
635 /* First try to use the filename as it is. */
636
637 if ((fd = open(file, O_RDONLY)) != -1)
638 return fd;
639
640 /*
641 * If that doesn't work and the filename doesn't
642 * already end in .gz, try appending .gz.
643 */
644
645 if ( ! curp->gzip) {
646 save_errno = errno;
647 mandoc_asprintf(&cp, "%s.gz", file);
648 fd = open(cp, O_RDONLY);
649 free(cp);
650 errno = save_errno;
651 if (fd != -1) {
652 curp->gzip = 1;
653 return fd;
654 }
655 }
656
657 /* Neither worked, give up. */
658
659 return -1;
660 }
661
662 struct mparse *
mparse_alloc(int options,enum mandoc_os os_e,const char * os_s)663 mparse_alloc(int options, enum mandoc_os os_e, const char *os_s)
664 {
665 struct mparse *curp;
666
667 curp = mandoc_calloc(1, sizeof(struct mparse));
668
669 curp->options = options;
670 curp->os_s = os_s;
671
672 curp->roff = roff_alloc(options);
673 curp->man = roff_man_alloc(curp->roff, curp->os_s,
674 curp->options & MPARSE_QUICK ? 1 : 0);
675 if (curp->options & MPARSE_MDOC) {
676 curp->man->meta.macroset = MACROSET_MDOC;
677 if (curp->man->mdocmac == NULL)
678 curp->man->mdocmac = roffhash_alloc(MDOC_Dd, MDOC_MAX);
679 } else if (curp->options & MPARSE_MAN) {
680 curp->man->meta.macroset = MACROSET_MAN;
681 if (curp->man->manmac == NULL)
682 curp->man->manmac = roffhash_alloc(MAN_TH, MAN_MAX);
683 }
684 curp->man->meta.first->tok = TOKEN_NONE;
685 curp->man->meta.os_e = os_e;
686 tag_alloc();
687 return curp;
688 }
689
690 void
mparse_reset(struct mparse * curp)691 mparse_reset(struct mparse *curp)
692 {
693 tag_free();
694 roff_reset(curp->roff);
695 roff_man_reset(curp->man);
696 free_buf_list(curp->secondary);
697 curp->secondary = NULL;
698 curp->gzip = 0;
699 tag_alloc();
700 }
701
702 void
mparse_free(struct mparse * curp)703 mparse_free(struct mparse *curp)
704 {
705 tag_free();
706 roffhash_free(curp->man->mdocmac);
707 roffhash_free(curp->man->manmac);
708 roff_man_free(curp->man);
709 roff_free(curp->roff);
710 free_buf_list(curp->secondary);
711 free(curp);
712 }
713
714 struct roff_meta *
mparse_result(struct mparse * curp)715 mparse_result(struct mparse *curp)
716 {
717 roff_state_reset(curp->man);
718 if (curp->options & MPARSE_VALIDATE) {
719 if (curp->man->meta.macroset == MACROSET_MDOC)
720 mdoc_validate(curp->man);
721 else
722 man_validate(curp->man);
723 tag_postprocess(curp->man, curp->man->meta.first);
724 }
725 return &curp->man->meta;
726 }
727
728 void
mparse_copy(const struct mparse * p)729 mparse_copy(const struct mparse *p)
730 {
731 struct buf *buf;
732
733 for (buf = p->secondary; buf != NULL; buf = buf->next)
734 puts(buf->buf);
735 }
736