1 /* $NetBSD: magic.c,v 1.18 2023/08/18 19:00:11 christos Exp $ */
2
3 /*
4 * Copyright (c) Christos Zoulas 2003.
5 * All Rights Reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice immediately at the beginning of the file, without modification,
12 * this list of conditions, and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
21 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30 #ifdef WIN32
31 #include <windows.h>
32 #include <shlwapi.h>
33 #endif
34
35 #include "file.h"
36
37 #ifndef lint
38 #if 0
39 FILE_RCSID("@(#)$File: magic.c,v 1.121 2023/02/09 17:45:19 christos Exp $")
40 #else
41 __RCSID("$NetBSD: magic.c,v 1.18 2023/08/18 19:00:11 christos Exp $");
42 #endif
43 #endif /* lint */
44
45 #include "magic.h"
46
47 #include <stdlib.h>
48 #include <unistd.h>
49 #include <string.h>
50 #ifdef QUICK
51 #include <sys/mman.h>
52 #endif
53 #include <limits.h> /* for PIPE_BUF */
54
55 #if defined(HAVE_UTIMES)
56 # include <sys/time.h>
57 #elif defined(HAVE_UTIME)
58 # if defined(HAVE_SYS_UTIME_H)
59 # include <sys/utime.h>
60 # elif defined(HAVE_UTIME_H)
61 # include <utime.h>
62 # endif
63 #endif
64
65 #ifdef HAVE_UNISTD_H
66 #include <unistd.h> /* for read() */
67 #endif
68
69 #ifndef PIPE_BUF
70 /* Get the PIPE_BUF from pathconf */
71 #ifdef _PC_PIPE_BUF
72 #define PIPE_BUF pathconf(".", _PC_PIPE_BUF)
73 #else
74 #define PIPE_BUF 512
75 #endif
76 #endif
77
78 file_private void close_and_restore(const struct magic_set *, const char *, int,
79 const struct stat *);
80 file_private int unreadable_info(struct magic_set *, mode_t, const char *);
81 file_private const char* get_default_magic(void);
82 #ifndef COMPILE_ONLY
83 file_private const char *file_or_fd(struct magic_set *, const char *, int);
84 #endif
85
86 #ifndef STDIN_FILENO
87 #define STDIN_FILENO 0
88 #endif
89
90 #ifdef WIN32
91 /* HINSTANCE of this shared library. Needed for get_default_magic() */
92 static HINSTANCE _w32_dll_instance = NULL;
93
94 static void
_w32_append_path(char ** hmagicpath,const char * fmt,...)95 _w32_append_path(char **hmagicpath, const char *fmt, ...)
96 {
97 char *tmppath;
98 char *newpath;
99 va_list ap;
100
101 va_start(ap, fmt);
102 if (vasprintf(&tmppath, fmt, ap) < 0) {
103 va_end(ap);
104 return;
105 }
106 va_end(ap);
107
108 if (access(tmppath, R_OK) == -1)
109 goto out;
110
111 if (*hmagicpath == NULL) {
112 *hmagicpath = tmppath;
113 return;
114 }
115
116 if (asprintf(&newpath, "%s%c%s", *hmagicpath, PATHSEP, tmppath) < 0)
117 goto out;
118
119 free(*hmagicpath);
120 free(tmppath);
121 *hmagicpath = newpath;
122 return;
123 out:
124 free(tmppath);
125 }
126
127 static void
_w32_get_magic_relative_to(char ** hmagicpath,HINSTANCE module)128 _w32_get_magic_relative_to(char **hmagicpath, HINSTANCE module)
129 {
130 static const char *trypaths[] = {
131 "%s/share/misc/magic.mgc",
132 "%s/magic.mgc",
133 };
134 LPSTR dllpath;
135 size_t sp;
136
137 dllpath = calloc(MAX_PATH + 1, sizeof(*dllpath));
138
139 if (!GetModuleFileNameA(module, dllpath, MAX_PATH))
140 goto out;
141
142 PathRemoveFileSpecA(dllpath);
143
144 if (module) {
145 char exepath[MAX_PATH];
146 GetModuleFileNameA(NULL, exepath, MAX_PATH);
147 PathRemoveFileSpecA(exepath);
148 if (stricmp(exepath, dllpath) == 0)
149 goto out;
150 }
151
152 sp = strlen(dllpath);
153 if (sp > 3 && stricmp(&dllpath[sp - 3], "bin") == 0) {
154 _w32_append_path(hmagicpath,
155 "%s/../share/misc/magic.mgc", dllpath);
156 goto out;
157 }
158
159 for (sp = 0; sp < __arraycount(trypaths); sp++)
160 _w32_append_path(hmagicpath, trypaths[sp], dllpath);
161 out:
162 free(dllpath);
163 }
164
165 #ifndef BUILD_AS_WINDOWS_STATIC_LIBARAY
166 /* Placate GCC by offering a sacrificial previous prototype */
167 BOOL WINAPI DllMain(HINSTANCE, DWORD, LPVOID);
168
169 BOOL WINAPI
DllMain(HINSTANCE hinstDLL,DWORD fdwReason,LPVOID lpvReserved)170 DllMain(HINSTANCE hinstDLL, DWORD fdwReason,
171 LPVOID lpvReserved __attribute__((__unused__)))
172 {
173 if (fdwReason == DLL_PROCESS_ATTACH)
174 _w32_dll_instance = hinstDLL;
175 return 1;
176 }
177 #endif
178 #endif
179
180 file_private const char *
get_default_magic(void)181 get_default_magic(void)
182 {
183 static const char hmagic[] = "/.magic/magic.mgc";
184 static char *default_magic;
185 char *home, *hmagicpath;
186
187 #ifndef WIN32
188 struct stat st;
189
190 if (default_magic) {
191 free(default_magic);
192 default_magic = NULL;
193 }
194 if ((home = getenv("HOME")) == NULL)
195 return MAGIC;
196
197 if (asprintf(&hmagicpath, "%s/.magic.mgc", home) < 0)
198 return MAGIC;
199 if (stat(hmagicpath, &st) == -1) {
200 free(hmagicpath);
201 if (asprintf(&hmagicpath, "%s/.magic", home) < 0)
202 return MAGIC;
203 if (stat(hmagicpath, &st) == -1)
204 goto out;
205 if (S_ISDIR(st.st_mode)) {
206 free(hmagicpath);
207 if (asprintf(&hmagicpath, "%s/%s", home, hmagic) < 0)
208 return MAGIC;
209 if (access(hmagicpath, R_OK) == -1)
210 goto out;
211 }
212 }
213
214 if (asprintf(&default_magic, "%s:%s", hmagicpath, MAGIC) < 0)
215 goto out;
216 free(hmagicpath);
217 return default_magic;
218 out:
219 default_magic = NULL;
220 free(hmagicpath);
221 return MAGIC;
222 #else
223 hmagicpath = NULL;
224
225 if (default_magic) {
226 free(default_magic);
227 default_magic = NULL;
228 }
229
230 /* Before anything else, try to get a magic file from user HOME */
231 if ((home = getenv("HOME")) != NULL)
232 _w32_append_path(&hmagicpath, "%s%s", home, hmagic);
233
234 /* First, try to get a magic file from user-application data */
235 if ((home = getenv("LOCALAPPDATA")) != NULL)
236 _w32_append_path(&hmagicpath, "%s%s", home, hmagic);
237
238 /* Second, try to get a magic file from the user profile data */
239 if ((home = getenv("USERPROFILE")) != NULL)
240 _w32_append_path(&hmagicpath,
241 "%s/Local Settings/Application Data%s", home, hmagic);
242
243 /* Third, try to get a magic file from Common Files */
244 if ((home = getenv("COMMONPROGRAMFILES")) != NULL)
245 _w32_append_path(&hmagicpath, "%s%s", home, hmagic);
246
247 /* Fourth, try to get magic file relative to exe location */
248 _w32_get_magic_relative_to(&hmagicpath, NULL);
249
250 /* Fifth, try to get magic file relative to dll location */
251 _w32_get_magic_relative_to(&hmagicpath, _w32_dll_instance);
252
253 /* Avoid MAGIC constant - it likely points to a file within MSys tree */
254 default_magic = hmagicpath;
255 return default_magic;
256 #endif
257 }
258
259 file_public const char *
magic_getpath(const char * magicfile,int action)260 magic_getpath(const char *magicfile, int action)
261 {
262 if (magicfile != NULL)
263 return magicfile;
264
265 magicfile = getenv("MAGIC");
266 if (magicfile != NULL)
267 return magicfile;
268
269 return action == FILE_LOAD ? get_default_magic() : MAGIC;
270 }
271
272 file_public struct magic_set *
magic_open(int flags)273 magic_open(int flags)
274 {
275 return file_ms_alloc(flags);
276 }
277
278 file_private int
unreadable_info(struct magic_set * ms,mode_t md,const char * file)279 unreadable_info(struct magic_set *ms, mode_t md, const char *file)
280 {
281 if (file) {
282 /* We cannot open it, but we were able to stat it. */
283 if (access(file, W_OK) == 0)
284 if (file_printf(ms, "writable, ") == -1)
285 return -1;
286 #ifndef WIN32
287 if (access(file, X_OK) == 0)
288 if (file_printf(ms, "executable, ") == -1)
289 return -1;
290 #else
291 /* X_OK doesn't work well on MS-Windows */
292 {
293 const char *p = strrchr(file, '.');
294 if (p && (stricmp(p, ".exe")
295 || stricmp(p, ".dll")
296 || stricmp(p, ".bat")
297 || stricmp(p, ".cmd")))
298 if (file_printf(ms, "writable, ") == -1)
299 return -1;
300 }
301 #endif
302 }
303 if (S_ISREG(md))
304 if (file_printf(ms, "regular file, ") == -1)
305 return -1;
306 if (file_printf(ms, "no read permission") == -1)
307 return -1;
308 return 0;
309 }
310
311 file_public void
magic_close(struct magic_set * ms)312 magic_close(struct magic_set *ms)
313 {
314 if (ms == NULL)
315 return;
316 file_ms_free(ms);
317 }
318
319 /*
320 * load a magic file
321 */
322 file_public int
magic_load(struct magic_set * ms,const char * magicfile)323 magic_load(struct magic_set *ms, const char *magicfile)
324 {
325 if (ms == NULL)
326 return -1;
327 return file_apprentice(ms, magicfile, FILE_LOAD);
328 }
329
330 #ifndef COMPILE_ONLY
331 /*
332 * Install a set of compiled magic buffers.
333 */
334 file_public int
magic_load_buffers(struct magic_set * ms,void ** bufs,size_t * sizes,size_t nbufs)335 magic_load_buffers(struct magic_set *ms, void **bufs, size_t *sizes,
336 size_t nbufs)
337 {
338 if (ms == NULL)
339 return -1;
340 return buffer_apprentice(ms, RCAST(struct magic **, bufs),
341 sizes, nbufs);
342 }
343 #endif
344
345 file_public int
magic_compile(struct magic_set * ms,const char * magicfile)346 magic_compile(struct magic_set *ms, const char *magicfile)
347 {
348 if (ms == NULL)
349 return -1;
350 return file_apprentice(ms, magicfile, FILE_COMPILE);
351 }
352
353 file_public int
magic_check(struct magic_set * ms,const char * magicfile)354 magic_check(struct magic_set *ms, const char *magicfile)
355 {
356 if (ms == NULL)
357 return -1;
358 return file_apprentice(ms, magicfile, FILE_CHECK);
359 }
360
361 file_public int
magic_list(struct magic_set * ms,const char * magicfile)362 magic_list(struct magic_set *ms, const char *magicfile)
363 {
364 if (ms == NULL)
365 return -1;
366 return file_apprentice(ms, magicfile, FILE_LIST);
367 }
368
369 file_private void
close_and_restore(const struct magic_set * ms,const char * name,int fd,const struct stat * sb)370 close_and_restore(const struct magic_set *ms, const char *name, int fd,
371 const struct stat *sb)
372 {
373 if (fd == STDIN_FILENO || name == NULL)
374 return;
375 (void) close(fd);
376
377 if ((ms->flags & MAGIC_PRESERVE_ATIME) != 0) {
378 /*
379 * Try to restore access, modification times if read it.
380 * This is really *bad* because it will modify the status
381 * time of the file... And of course this will affect
382 * backup programs
383 */
384 #ifdef HAVE_UTIMES
385 struct timeval utsbuf[2];
386 (void)memset(utsbuf, 0, sizeof(utsbuf));
387 utsbuf[0].tv_sec = sb->st_atime;
388 utsbuf[1].tv_sec = sb->st_mtime;
389
390 (void) utimes(name, utsbuf); /* don't care if loses */
391 #elif defined(HAVE_UTIME_H) || defined(HAVE_SYS_UTIME_H)
392 struct utimbuf utbuf;
393
394 (void)memset(&utbuf, 0, sizeof(utbuf));
395 utbuf.actime = sb->st_atime;
396 utbuf.modtime = sb->st_mtime;
397 (void) utime(name, &utbuf); /* don't care if loses */
398 #endif
399 }
400 }
401
402 #ifndef COMPILE_ONLY
403
404 /*
405 * find type of descriptor
406 */
407 file_public const char *
magic_descriptor(struct magic_set * ms,int fd)408 magic_descriptor(struct magic_set *ms, int fd)
409 {
410 if (ms == NULL)
411 return NULL;
412 return file_or_fd(ms, NULL, fd);
413 }
414
415 /*
416 * find type of named file
417 */
418 file_public const char *
magic_file(struct magic_set * ms,const char * inname)419 magic_file(struct magic_set *ms, const char *inname)
420 {
421 if (ms == NULL)
422 return NULL;
423 return file_or_fd(ms, inname, STDIN_FILENO);
424 }
425
426 file_private const char *
file_or_fd(struct magic_set * ms,const char * inname,int fd)427 file_or_fd(struct magic_set *ms, const char *inname, int fd)
428 {
429 int rv = -1;
430 unsigned char *buf;
431 struct stat sb;
432 ssize_t nbytes = 0; /* number of bytes read from a datafile */
433 int ispipe = 0;
434 int okstat = 0;
435 off_t pos = CAST(off_t, -1);
436
437 if (file_reset(ms, 1) == -1)
438 goto out;
439
440 /*
441 * one extra for terminating '\0', and
442 * some overlapping space for matches near EOF
443 */
444 #define SLOP (1 + sizeof(union VALUETYPE))
445 if ((buf = CAST(unsigned char *, malloc(ms->bytes_max + SLOP))) == NULL)
446 return NULL;
447
448 switch (file_fsmagic(ms, inname, &sb)) {
449 case -1: /* error */
450 goto done;
451 case 0: /* nothing found */
452 break;
453 default: /* matched it and printed type */
454 rv = 0;
455 goto done;
456 }
457
458 #ifdef WIN32
459 /* Place stdin in binary mode, so EOF (Ctrl+Z) doesn't stop early. */
460 if (fd == STDIN_FILENO)
461 _setmode(STDIN_FILENO, O_BINARY);
462 #endif
463 if (inname != NULL) {
464 int flags = O_RDONLY|O_BINARY|O_NONBLOCK|O_CLOEXEC;
465 errno = 0;
466 if ((fd = open(inname, flags)) < 0) {
467 okstat = stat(inname, &sb) == 0;
468 #ifdef WIN32
469 /*
470 * Can't stat, can't open. It may have been opened in
471 * fsmagic, so if the user doesn't have read permission,
472 * allow it to say so; otherwise an error was probably
473 * displayed in fsmagic.
474 */
475 if (!okstat && errno == EACCES) {
476 sb.st_mode = S_IFBLK;
477 okstat = 1;
478 }
479 #endif
480 if (okstat &&
481 unreadable_info(ms, sb.st_mode, inname) == -1)
482 goto done;
483 rv = 0;
484 goto done;
485 }
486 #if O_CLOEXEC == 0 && defined(F_SETFD)
487 (void)fcntl(fd, F_SETFD, FD_CLOEXEC);
488 #endif
489 }
490
491 if (fd != -1) {
492 okstat = fstat(fd, &sb) == 0;
493 if (okstat && S_ISFIFO(sb.st_mode))
494 ispipe = 1;
495 if (inname == NULL)
496 pos = lseek(fd, CAST(off_t, 0), SEEK_CUR);
497 }
498
499 /*
500 * try looking at the first ms->bytes_max bytes
501 */
502 if (ispipe) {
503 if (fd != -1) {
504 ssize_t r = 0;
505
506 while ((r = sread(fd, RCAST(void *, &buf[nbytes]),
507 CAST(size_t, ms->bytes_max - nbytes), 1)) > 0) {
508 nbytes += r;
509 if (r < PIPE_BUF) break;
510 }
511 }
512
513 if (nbytes == 0 && inname) {
514 /* We can not read it, but we were able to stat it. */
515 if (unreadable_info(ms, sb.st_mode, inname) == -1)
516 goto done;
517 rv = 0;
518 goto done;
519 }
520
521 } else if (fd != -1) {
522 /* Windows refuses to read from a big console buffer. */
523 size_t howmany =
524 #ifdef WIN32
525 _isatty(fd) ? 8 * 1024 :
526 #endif
527 ms->bytes_max;
528 if ((nbytes = read(fd, RCAST(void *, buf), howmany)) == -1) {
529 if (inname == NULL && fd != STDIN_FILENO)
530 file_error(ms, errno, "cannot read fd %d", fd);
531 else
532 file_error(ms, errno, "cannot read `%s'",
533 inname == NULL ? "/dev/stdin" : inname);
534 goto done;
535 }
536 }
537
538 (void)memset(buf + nbytes, 0, SLOP); /* NUL terminate */
539 if (file_buffer(ms, fd, okstat ? &sb : NULL, inname, buf, CAST(size_t, nbytes)) == -1)
540 goto done;
541 rv = 0;
542 done:
543 free(buf);
544 if (fd != -1) {
545 if (pos != CAST(off_t, -1))
546 (void)lseek(fd, pos, SEEK_SET);
547 close_and_restore(ms, inname, fd, &sb);
548 }
549 out:
550 return rv == 0 ? file_getbuffer(ms) : NULL;
551 }
552
553
554 file_public const char *
magic_buffer(struct magic_set * ms,const void * buf,size_t nb)555 magic_buffer(struct magic_set *ms, const void *buf, size_t nb)
556 {
557 if (ms == NULL)
558 return NULL;
559 if (file_reset(ms, 1) == -1)
560 return NULL;
561 /*
562 * The main work is done here!
563 * We have the file name and/or the data buffer to be identified.
564 */
565 if (file_buffer(ms, -1, NULL, NULL, buf, nb) == -1) {
566 return NULL;
567 }
568 return file_getbuffer(ms);
569 }
570 #endif
571
572 file_public const char *
magic_error(struct magic_set * ms)573 magic_error(struct magic_set *ms)
574 {
575 if (ms == NULL)
576 return "Magic database is not open";
577 return (ms->event_flags & EVENT_HAD_ERR) ? ms->o.buf : NULL;
578 }
579
580 file_public int
magic_errno(struct magic_set * ms)581 magic_errno(struct magic_set *ms)
582 {
583 if (ms == NULL)
584 return EINVAL;
585 return (ms->event_flags & EVENT_HAD_ERR) ? ms->error : 0;
586 }
587
588 file_public int
magic_getflags(struct magic_set * ms)589 magic_getflags(struct magic_set *ms)
590 {
591 if (ms == NULL)
592 return -1;
593
594 return ms->flags;
595 }
596
597 file_public int
magic_setflags(struct magic_set * ms,int flags)598 magic_setflags(struct magic_set *ms, int flags)
599 {
600 if (ms == NULL)
601 return -1;
602 #if !defined(HAVE_UTIME) && !defined(HAVE_UTIMES)
603 if (flags & MAGIC_PRESERVE_ATIME)
604 return -1;
605 #endif
606 ms->flags = flags;
607 return 0;
608 }
609
610 file_public int
magic_version(void)611 magic_version(void)
612 {
613 return MAGIC_VERSION;
614 }
615
616 file_public int
magic_setparam(struct magic_set * ms,int param,const void * val)617 magic_setparam(struct magic_set *ms, int param, const void *val)
618 {
619 if (ms == NULL)
620 return -1;
621 switch (param) {
622 case MAGIC_PARAM_INDIR_MAX:
623 ms->indir_max = CAST(uint16_t, *CAST(const size_t *, val));
624 return 0;
625 case MAGIC_PARAM_NAME_MAX:
626 ms->name_max = CAST(uint16_t, *CAST(const size_t *, val));
627 return 0;
628 case MAGIC_PARAM_ELF_PHNUM_MAX:
629 ms->elf_phnum_max = CAST(uint16_t, *CAST(const size_t *, val));
630 return 0;
631 case MAGIC_PARAM_ELF_SHNUM_MAX:
632 ms->elf_shnum_max = CAST(uint16_t, *CAST(const size_t *, val));
633 return 0;
634 case MAGIC_PARAM_ELF_SHSIZE_MAX:
635 ms->elf_shsize_max = *CAST(const size_t *, val);
636 return 0;
637 case MAGIC_PARAM_ELF_NOTES_MAX:
638 ms->elf_notes_max = CAST(uint16_t, *CAST(const size_t *, val));
639 return 0;
640 case MAGIC_PARAM_REGEX_MAX:
641 ms->regex_max = CAST(uint16_t, *CAST(const size_t *, val));
642 return 0;
643 case MAGIC_PARAM_BYTES_MAX:
644 ms->bytes_max = *CAST(const size_t *, val);
645 return 0;
646 case MAGIC_PARAM_ENCODING_MAX:
647 ms->encoding_max = *CAST(const size_t *, val);
648 return 0;
649 default:
650 errno = EINVAL;
651 return -1;
652 }
653 }
654
655 file_public int
magic_getparam(struct magic_set * ms,int param,void * val)656 magic_getparam(struct magic_set *ms, int param, void *val)
657 {
658 if (ms == NULL)
659 return -1;
660 switch (param) {
661 case MAGIC_PARAM_INDIR_MAX:
662 *CAST(size_t *, val) = ms->indir_max;
663 return 0;
664 case MAGIC_PARAM_NAME_MAX:
665 *CAST(size_t *, val) = ms->name_max;
666 return 0;
667 case MAGIC_PARAM_ELF_PHNUM_MAX:
668 *CAST(size_t *, val) = ms->elf_phnum_max;
669 return 0;
670 case MAGIC_PARAM_ELF_SHNUM_MAX:
671 *CAST(size_t *, val) = ms->elf_shnum_max;
672 return 0;
673 case MAGIC_PARAM_ELF_SHSIZE_MAX:
674 *CAST(size_t *, val) = ms->elf_shsize_max;
675 return 0;
676 case MAGIC_PARAM_ELF_NOTES_MAX:
677 *CAST(size_t *, val) = ms->elf_notes_max;
678 return 0;
679 case MAGIC_PARAM_REGEX_MAX:
680 *CAST(size_t *, val) = ms->regex_max;
681 return 0;
682 case MAGIC_PARAM_BYTES_MAX:
683 *CAST(size_t *, val) = ms->bytes_max;
684 return 0;
685 case MAGIC_PARAM_ENCODING_MAX:
686 *CAST(size_t *, val) = ms->encoding_max;
687 return 0;
688 default:
689 errno = EINVAL;
690 return -1;
691 }
692 }
693