source: trunk/src/kmk/kmkbuiltin/test.c@ 1750

Last change on this file since 1750 was 1594, checked in by bird, 18 years ago

xmalloc should work fine.
File size: 19.5 KB
Line 
1/* $NetBSD: test.c,v 1.33 2007/06/24 18:54:58 christos Exp $ */
2
3/*
4 * test(1); version 7-like -- author Erik Baalbergen
5 * modified by Eric Gisin to be used as built-in.
6 * modified by Arnold Robbins to add SVR3 compatibility
7 * (-x -c -b -p -u -g -k) plus Korn's -L -nt -ot -ef and new -S (socket).
8 * modified by J.T. Conklin for NetBSD.
9 *
10 * This program is in the Public Domain.
11 */
12
13/*#include <sys/cdefs.h>
14#ifndef lint
15__RCSID("$NetBSD: test.c,v 1.33 2007/06/24 18:54:58 christos Exp $");
16#endif*/
17
18#include <sys/stat.h>
19#include <sys/types.h>
20
21#include <ctype.h>
22#include "err.h"
23#include <errno.h>
24#include <limits.h>
25#include <stdio.h>
26#include <stdlib.h>
27#include <string.h>
28#ifdef _MSC_VER
29# include <direct.h>
30# include <io.h>
31# include <process.h>
32# include "mscfakes.h"
33#else
34# include <unistd.h>
35#endif
36#include <stdarg.h>
37#include <sys/stat.h>
38
39#include "kmkbuiltin.h"
40
41#ifndef __arraycount
42# define __arraycount(a) ( sizeof(a) / sizeof(a[0]) )
43#endif
44
45
46/* test(1) accepts the following grammar:
47 oexpr ::= aexpr | aexpr "-o" oexpr ;
48 aexpr ::= nexpr | nexpr "-a" aexpr ;
49 nexpr ::= primary | "!" primary
50 primary ::= unary-operator operand
51 | operand binary-operator operand
52 | operand
53 | "(" oexpr ")"
54 ;
55 unary-operator ::= "-r"|"-w"|"-x"|"-f"|"-d"|"-c"|"-b"|"-p"|
56 "-u"|"-g"|"-k"|"-s"|"-t"|"-z"|"-n"|"-o"|"-O"|"-G"|"-L"|"-S";
57
58 binary-operator ::= "="|"!="|"-eq"|"-ne"|"-ge"|"-gt"|"-le"|"-lt"|
59 "-nt"|"-ot"|"-ef";
60 operand ::= <any legal UNIX file name>
61*/
62
63enum token {
64 EOI,
65 FILRD,
66 FILWR,
67 FILEX,
68 FILEXIST,
69 FILREG,
70 FILDIR,
71 FILCDEV,
72 FILBDEV,
73 FILFIFO,
74 FILSOCK,
75 FILSYM,
76 FILGZ,
77 FILTT,
78 FILSUID,
79 FILSGID,
80 FILSTCK,
81 FILNT,
82 FILOT,
83 FILEQ,
84 FILUID,
85 FILGID,
86 STREZ,
87 STRNZ,
88 STREQ,
89 STRNE,
90 STRLT,
91 STRGT,
92 INTEQ,
93 INTNE,
94 INTGE,
95 INTGT,
96 INTLE,
97 INTLT,
98 UNOT,
99 BAND,
100 BOR,
101 LPAREN,
102 RPAREN,
103 OPERAND
104};
105
106enum token_types {
107 UNOP,
108 BINOP,
109 BUNOP,
110 BBINOP,
111 PAREN
112};
113
114struct t_op {
115 const char *op_text;
116 short op_num, op_type;
117};
118
119static const struct t_op cop[] = {
120 {"!", UNOT, BUNOP},
121 {"(", LPAREN, PAREN},
122 {")", RPAREN, PAREN},
123 {"<", STRLT, BINOP},
124 {"=", STREQ, BINOP},
125 {">", STRGT, BINOP},
126};
127
128static const struct t_op cop2[] = {
129 {"!=", STRNE, BINOP},
130};
131
132static const struct t_op mop3[] = {
133 {"ef", FILEQ, BINOP},
134 {"eq", INTEQ, BINOP},
135 {"ge", INTGE, BINOP},
136 {"gt", INTGT, BINOP},
137 {"le", INTLE, BINOP},
138 {"lt", INTLT, BINOP},
139 {"ne", INTNE, BINOP},
140 {"nt", FILNT, BINOP},
141 {"ot", FILOT, BINOP},
142};
143
144static const struct t_op mop2[] = {
145 {"G", FILGID, UNOP},
146 {"L", FILSYM, UNOP},
147 {"O", FILUID, UNOP},
148 {"S", FILSOCK,UNOP},
149 {"a", BAND, BBINOP},
150 {"b", FILBDEV,UNOP},
151 {"c", FILCDEV,UNOP},
152 {"d", FILDIR, UNOP},
153 {"e", FILEXIST,UNOP},
154 {"f", FILREG, UNOP},
155 {"g", FILSGID,UNOP},
156 {"h", FILSYM, UNOP}, /* for backwards compat */
157 {"k", FILSTCK,UNOP},
158 {"n", STRNZ, UNOP},
159 {"o", BOR, BBINOP},
160 {"p", FILFIFO,UNOP},
161 {"r", FILRD, UNOP},
162 {"s", FILGZ, UNOP},
163 {"t", FILTT, UNOP},
164 {"u", FILSUID,UNOP},
165 {"w", FILWR, UNOP},
166 {"x", FILEX, UNOP},
167 {"z", STREZ, UNOP},
168};
169
170static char **t_wp;
171static struct t_op const *t_wp_op;
172
173static int syntax(const char *, const char *);
174static int oexpr(enum token);
175static int aexpr(enum token);
176static int nexpr(enum token);
177static int primary(enum token);
178static int binop(void);
179static int test_access(struct stat *, mode_t);
180static int filstat(char *, enum token);
181static enum token t_lex(char *);
182static int isoperand(void);
183static int getn(const char *);
184static int newerf(const char *, const char *);
185static int olderf(const char *, const char *);
186static int equalf(const char *, const char *);
187static int usage(const char *);
188
189#if !defined(kmk_builtin_test) || defined(ELECTRIC_HEAP)
190extern void *xmalloc(unsigned int);
191#else
192extern void *xmalloc(unsigned int sz)
193{
194 void *p = malloc(sz);
195 if (!p) {
196 fprintf(stderr, "%s: malloc(%u) failed\n", g_progname, sz);
197 exit(1);
198 }
199 return p;
200}
201#endif
202
203int kmk_builtin_test(int argc, char **argv, char **envp, char ***ppapszArgvSpawn)
204{
205 int res;
206 char **argv_spawn;
207 int i;
208
209 g_progname = argv[0];
210
211 /* look for the '--', '--help' and '--version'. */
212 argv_spawn = NULL;
213 for (i = 1; i < argc; i++) {
214 if ( argv[i][0] == '-'
215 && argv[i][1] == '-') {
216 if (argv[i][2] == '\0') {
217 argc = i;
218 argv[i] = NULL;
219
220 /* skip blank arguments (happens inside kmk) */
221 while (argv[++i]) {
222 const char *psz = argv[i];
223 while (isspace(*psz))
224 psz++;
225 if (*psz)
226 break;
227 }
228 argv_spawn = &argv[i];
229 break;
230 }
231 if (!strcmp(argv[i], "--help"))
232 return usage(argv[0]);
233 if (!strcmp(argv[i], "--version"))
234 return kbuild_version(argv[0]);
235 }
236 }
237
238 /* are we '['? then check for ']'. */
239 if (strcmp(g_progname, "[") == 0) { /** @todo should skip the path in g_progname */
240 if (strcmp(argv[--argc], "]"))
241 return errx(1, "missing ]");
242 argv[argc] = NULL;
243 }
244
245 /* evaluate the expression */
246 if (argc < 2)
247 res = 1;
248 else {
249 t_wp = &argv[1];
250 res = oexpr(t_lex(*t_wp));
251 if (res != -42 && *t_wp != NULL && *++t_wp != NULL)
252 res = syntax(*t_wp, "unexpected operator");
253 if (res == -42)
254 return 1; /* don't mix syntax errors with the argv_spawn ignore */
255 res = !res;
256 }
257
258 /* anything to execute on success? */
259 if (argv_spawn) {
260 if (res != 0 || !argv_spawn[0])
261 res = 0; /* ignored */
262 else {
263#ifdef kmk_builtin_test
264 /* try exec the specified process */
265# if defined(_MSC_VER)
266 res = _spawnvp(_P_WAIT, argv_spawn[0], argv_spawn);
267 if (res == -1)
268 res = err(1, "_spawnvp(_P_WAIT,%s,..)", argv_spawn[i]);
269# else
270 execvp(argv_spawn[i], &argv_spawn[i]);
271 res = err(1, "execvp(%s,..)", argv_spawn[i]);
272# endif
273#else /* in kmk */
274 /* let job.c spawn the process, make a job.c style argv_spawn copy. */
275 char *buf, *cur, **argv_new;
276 size_t sz = 0;
277 int argc_new = 0;
278 while (argv_spawn[argc_new]) {
279 size_t len = strlen(argv_spawn[argc_new]) + 1;
280 sz += (len + sizeof(void *) - 1) & ~(sizeof(void *) - 1);
281 argc_new++;
282 }
283
284 argv_new = xmalloc((argc_new + 1) * sizeof(char *));
285 buf = cur = xmalloc(sz);
286 for (i = 0; i < argc_new; i++) {
287 size_t len = strlen(argv_spawn[i]) + 1;
288 argv_new[i] = memcpy(cur, argv_spawn[i], len);
289 cur += (len + sizeof(void *) - 1) & ~(sizeof(void *) - 1);
290 }
291 argv_new[i] = NULL;
292
293 *ppapszArgvSpawn = argv_new;
294 res = 0;
295#endif /* in kmk */
296 }
297 }
298
299 return res;
300}
301
302static int
303syntax(const char *op, const char *msg)
304{
305
306 if (op && *op)
307 errx(1, "%s: %s", op, msg);
308 else
309 errx(1, "%s", msg);
310 return -42;
311}
312
313static int
314oexpr(enum token n)
315{
316 int res;
317
318 res = aexpr(n);
319 if (res == -42 || *t_wp == NULL)
320 return res;
321 if (t_lex(*++t_wp) == BOR) {
322 int res2 = oexpr(t_lex(*++t_wp));
323 return res2 != -42 ? res2 || res : res2;
324 }
325 t_wp--;
326 return res;
327}
328
329static int
330aexpr(enum token n)
331{
332 int res;
333
334 res = nexpr(n);
335 if (res == -42 || *t_wp == NULL)
336 return res;
337 if (t_lex(*++t_wp) == BAND) {
338 int res2 = aexpr(t_lex(*++t_wp));
339 return res2 != -42 ? res2 && res : res2;
340 }
341 t_wp--;
342 return res;
343}
344
345static int
346nexpr(enum token n)
347{
348 if (n == UNOT) {
349 int res = nexpr(t_lex(*++t_wp));
350 return res != -42 ? !res : res;
351 }
352 return primary(n);
353}
354
355static int
356primary(enum token n)
357{
358 enum token nn;
359 int res;
360
361 if (n == EOI)
362 return 0; /* missing expression */
363 if (n == LPAREN) {
364 if ((nn = t_lex(*++t_wp)) == RPAREN)
365 return 0; /* missing expression */
366 res = oexpr(nn);
367 if (res != -42 && t_lex(*++t_wp) != RPAREN)
368 return syntax(NULL, "closing paren expected");
369 return res;
370 }
371 if (t_wp_op && t_wp_op->op_type == UNOP) {
372 /* unary expression */
373 if (*++t_wp == NULL)
374 return syntax(t_wp_op->op_text, "argument expected");
375 switch (n) {
376 case STREZ:
377 return strlen(*t_wp) == 0;
378 case STRNZ:
379 return strlen(*t_wp) != 0;
380 case FILTT:
381 return isatty(getn(*t_wp));
382 default:
383 return filstat(*t_wp, n);
384 }
385 }
386
387 if (t_lex(t_wp[1]), t_wp_op && t_wp_op->op_type == BINOP) {
388 return binop();
389 }
390
391 return strlen(*t_wp) > 0;
392}
393
394static int
395binop(void)
396{
397 const char *opnd1, *opnd2;
398 struct t_op const *op;
399
400 opnd1 = *t_wp;
401 (void) t_lex(*++t_wp);
402 op = t_wp_op;
403
404 if ((opnd2 = *++t_wp) == NULL)
405 return syntax(op->op_text, "argument expected");
406
407 switch (op->op_num) {
408 case STREQ:
409 return strcmp(opnd1, opnd2) == 0;
410 case STRNE:
411 return strcmp(opnd1, opnd2) != 0;
412 case STRLT:
413 return strcmp(opnd1, opnd2) < 0;
414 case STRGT:
415 return strcmp(opnd1, opnd2) > 0;
416 case INTEQ:
417 return getn(opnd1) == getn(opnd2);
418 case INTNE:
419 return getn(opnd1) != getn(opnd2);
420 case INTGE:
421 return getn(opnd1) >= getn(opnd2);
422 case INTGT:
423 return getn(opnd1) > getn(opnd2);
424 case INTLE:
425 return getn(opnd1) <= getn(opnd2);
426 case INTLT:
427 return getn(opnd1) < getn(opnd2);
428 case FILNT:
429 return newerf(opnd1, opnd2);
430 case FILOT:
431 return olderf(opnd1, opnd2);
432 case FILEQ:
433 return equalf(opnd1, opnd2);
434 default:
435 abort();
436 /* NOTREACHED */
437#ifdef _MSC_VER
438 return -42;
439#endif
440 }
441}
442
443/*
444 * The manual, and IEEE POSIX 1003.2, suggests this should check the mode bits,
445 * not use access():
446 *
447 * True shall indicate only that the write flag is on. The file is not
448 * writable on a read-only file system even if this test indicates true.
449 *
450 * Unfortunately IEEE POSIX 1003.1-2001, as quoted in SuSv3, says only:
451 *
452 * True shall indicate that permission to read from file will be granted,
453 * as defined in "File Read, Write, and Creation".
454 *
455 * and that section says:
456 *
457 * When a file is to be read or written, the file shall be opened with an
458 * access mode corresponding to the operation to be performed. If file
459 * access permissions deny access, the requested operation shall fail.
460 *
461 * and of course access permissions are described as one might expect:
462 *
463 * * If a process has the appropriate privilege:
464 *
465 * * If read, write, or directory search permission is requested,
466 * access shall be granted.
467 *
468 * * If execute permission is requested, access shall be granted if
469 * execute permission is granted to at least one user by the file
470 * permission bits or by an alternate access control mechanism;
471 * otherwise, access shall be denied.
472 *
473 * * Otherwise:
474 *
475 * * The file permission bits of a file contain read, write, and
476 * execute/search permissions for the file owner class, file group
477 * class, and file other class.
478 *
479 * * Access shall be granted if an alternate access control mechanism
480 * is not enabled and the requested access permission bit is set for
481 * the class (file owner class, file group class, or file other class)
482 * to which the process belongs, or if an alternate access control
483 * mechanism is enabled and it allows the requested access; otherwise,
484 * access shall be denied.
485 *
486 * and when I first read this I thought: surely we can't go about using
487 * open(O_WRONLY) to try this test! However the POSIX 1003.1-2001 Rationale
488 * section for test does in fact say:
489 *
490 * On historical BSD systems, test -w directory always returned false
491 * because test tried to open the directory for writing, which always
492 * fails.
493 *
494 * and indeed this is in fact true for Seventh Edition UNIX, UNIX 32V, and UNIX
495 * System III, and thus presumably also for BSD up to and including 4.3.
496 *
497 * Secondly I remembered why using open() and/or access() are bogus. They
498 * don't work right for detecting read and write permissions bits when called
499 * by root.
500 *
501 * Interestingly the 'test' in 4.4BSD was closer to correct (as per
502 * 1003.2-1992) and it was implemented efficiently with stat() instead of
503 * open().
504 *
505 * This was apparently broken in NetBSD around about 1994/06/30 when the old
506 * 4.4BSD implementation was replaced with a (arguably much better coded)
507 * implementation derived from pdksh.
508 *
509 * Note that modern pdksh is yet different again, but still not correct, at
510 * least not w.r.t. 1003.2-1992.
511 *
512 * As I think more about it and read more of the related IEEE docs I don't like
513 * that wording about 'test -r' and 'test -w' in 1003.1-2001 at all. I very
514 * much prefer the original wording in 1003.2-1992. It is much more useful,
515 * and so that's what I've implemented.
516 *
517 * (Note that a strictly conforming implementation of 1003.1-2001 is in fact
518 * totally useless for the case in question since its 'test -w' and 'test -r'
519 * can never fail for root for any existing files, i.e. files for which 'test
520 * -e' succeeds.)
521 *
522 * The rationale for 1003.1-2001 suggests that the wording was "clarified" in
523 * 1003.1-2001 to align with the 1003.2b draft. 1003.2b Draft 12 (July 1999),
524 * which is the latest copy I have, does carry the same suggested wording as is
525 * in 1003.1-2001, with its rationale saying:
526 *
527 * This change is a clarification and is the result of interpretation
528 * request PASC 1003.2-92 #23 submitted for IEEE Std 1003.2-1992.
529 *
530 * That interpretation can be found here:
531 *
532 * http://www.pasc.org/interps/unofficial/db/p1003.2/pasc-1003.2-23.html
533 *
534 * Not terribly helpful, unfortunately. I wonder who that fence sitter was.
535 *
536 * Worse, IMVNSHO, I think the authors of 1003.2b-D12 have mis-interpreted the
537 * PASC interpretation and appear to be gone against at least one widely used
538 * implementation (namely 4.4BSD). The problem is that for file access by root
539 * this means that if test '-r' and '-w' are to behave as if open() were called
540 * then there's no way for a shell script running as root to check if a file
541 * has certain access bits set other than by the grotty means of interpreting
542 * the output of 'ls -l'. This was widely considered to be a bug in V7's
543 * "test" and is, I believe, one of the reasons why direct use of access() was
544 * avoided in some more recent implementations!
545 *
546 * I have always interpreted '-r' to match '-w' and '-x' as per the original
547 * wording in 1003.2-1992, not the other way around. I think 1003.2b goes much
548 * too far the wrong way without any valid rationale and that it's best if we
549 * stick with 1003.2-1992 and test the flags, and not mimic the behaviour of
550 * open() since we already know very well how it will work -- existance of the
551 * file is all that matters to open() for root.
552 *
553 * Unfortunately the SVID is no help at all (which is, I guess, partly why
554 * we're in this mess in the first place :-).
555 *
556 * The SysV implementation (at least in the 'test' builtin in /bin/sh) does use
557 * access(name, 2) even though it also goes to much greater lengths for '-x'
558 * matching the 1003.2-1992 definition (which is no doubt where that definition
559 * came from).
560 *
561 * The ksh93 implementation uses access() for '-r' and '-w' if
562 * (euid==uid&&egid==gid), but uses st_mode for '-x' iff running as root.
563 * i.e. it does strictly conform to 1003.1-2001 (and presumably 1003.2b).
564 */
565static int
566test_access(struct stat *sp, mode_t stmode)
567{
568#ifdef _MSC_VER
569 /* just pretend to be root for now. */
570 stmode = (stmode << 6) | (stmode << 3) | stmode;
571 return !!(sp->st_mode & stmode);
572#else
573 gid_t *groups;
574 register int n;
575 uid_t euid;
576 int maxgroups;
577
578 /*
579 * I suppose we could use access() if not running as root and if we are
580 * running with ((euid == uid) && (egid == gid)), but we've already
581 * done the stat() so we might as well just test the permissions
582 * directly instead of asking the kernel to do it....
583 */
584 euid = geteuid();
585 if (euid == 0) /* any bit is good enough */
586 stmode = (stmode << 6) | (stmode << 3) | stmode;
587 else if (sp->st_uid == euid)
588 stmode <<= 6;
589 else if (sp->st_gid == getegid())
590 stmode <<= 3;
591 else {
592 /* XXX stolen almost verbatim from ksh93.... */
593 /* on some systems you can be in several groups */
594 if ((maxgroups = getgroups(0, NULL)) <= 0)
595 maxgroups = NGROUPS_MAX; /* pre-POSIX system? */
596 groups = xmalloc((maxgroups + 1) * sizeof(gid_t));
597 n = getgroups(maxgroups, groups);
598 while (--n >= 0) {
599 if (groups[n] == sp->st_gid) {
600 stmode <<= 3;
601 break;
602 }
603 }
604 free(groups);
605 }
606
607 return !!(sp->st_mode & stmode);
608#endif
609}
610
611static int
612filstat(char *nm, enum token mode)
613{
614 struct stat s;
615
616 if (mode == FILSYM ? lstat(nm, &s) : stat(nm, &s))
617 return 0;
618
619 switch (mode) {
620 case FILRD:
621 return test_access(&s, S_IROTH);
622 case FILWR:
623 return test_access(&s, S_IWOTH);
624 case FILEX:
625 return test_access(&s, S_IXOTH);
626 case FILEXIST:
627 return 1; /* the successful lstat()/stat() is good enough */
628 case FILREG:
629 return S_ISREG(s.st_mode);
630 case FILDIR:
631 return S_ISDIR(s.st_mode);
632 case FILCDEV:
633#ifdef S_ISCHR
634 return S_ISCHR(s.st_mode);
635#else
636 return 0;
637#endif
638 case FILBDEV:
639#ifdef S_ISBLK
640 return S_ISBLK(s.st_mode);
641#else
642 return 0;
643#endif
644 case FILFIFO:
645#ifdef S_ISFIFO
646 return S_ISFIFO(s.st_mode);
647#else
648 return 0;
649#endif
650 case FILSOCK:
651#ifdef S_ISSOCK
652 return S_ISSOCK(s.st_mode);
653#else
654 return 0;
655#endif
656 case FILSYM:
657#ifdef S_ISLNK
658 return S_ISLNK(s.st_mode);
659#else
660 return 0;
661#endif
662 case FILSUID:
663 return (s.st_mode & S_ISUID) != 0;
664 case FILSGID:
665 return (s.st_mode & S_ISGID) != 0;
666 case FILSTCK:
667#ifdef S_ISVTX
668 return (s.st_mode & S_ISVTX) != 0;
669#else
670 return 0;
671#endif
672 case FILGZ:
673 return s.st_size > (off_t)0;
674 case FILUID:
675 return s.st_uid == geteuid();
676 case FILGID:
677 return s.st_gid == getegid();
678 default:
679 return 1;
680 }
681}
682
683#define VTOC(x) (const unsigned char *)((const struct t_op *)x)->op_text
684
685static int
686compare1(const void *va, const void *vb)
687{
688 const unsigned char *a = va;
689 const unsigned char *b = VTOC(vb);
690
691 return a[0] - b[0];
692}
693
694static int
695compare2(const void *va, const void *vb)
696{
697 const unsigned char *a = va;
698 const unsigned char *b = VTOC(vb);
699 int z = a[0] - b[0];
700
701 return z ? z : (a[1] - b[1]);
702}
703
704static struct t_op const *
705findop(const char *s)
706{
707 if (s[0] == '-') {
708 if (s[1] == '\0')
709 return NULL;
710 if (s[2] == '\0')
711 return bsearch(s + 1, mop2, __arraycount(mop2),
712 sizeof(*mop2), compare1);
713 else if (s[3] != '\0')
714 return NULL;
715 else
716 return bsearch(s + 1, mop3, __arraycount(mop3),
717 sizeof(*mop3), compare2);
718 } else {
719 if (s[1] == '\0')
720 return bsearch(s, cop, __arraycount(cop), sizeof(*cop),
721 compare1);
722 else if (strcmp(s, cop2[0].op_text) == 0)
723 return cop2;
724 else
725 return NULL;
726 }
727}
728
729static enum token
730t_lex(char *s)
731{
732 struct t_op const *op;
733
734 if (s == NULL) {
735 t_wp_op = NULL;
736 return EOI;
737 }
738
739 if ((op = findop(s)) != NULL) {
740 if (!((op->op_type == UNOP && isoperand()) ||
741 (op->op_num == LPAREN && *(t_wp+1) == 0))) {
742 t_wp_op = op;
743 return op->op_num;
744 }
745 }
746 t_wp_op = NULL;
747 return OPERAND;
748}
749
750static int
751isoperand(void)
752{
753 struct t_op const *op;
754 char *s, *t;
755
756 if ((s = *(t_wp+1)) == 0)
757 return 1;
758 if ((t = *(t_wp+2)) == 0)
759 return 0;
760 if ((op = findop(s)) != NULL)
761 return op->op_type == BINOP && (t[0] != ')' || t[1] != '\0');
762 return 0;
763}
764
765/* atoi with error detection */
766static int
767getn(const char *s)
768{
769 char *p;
770 long r;
771
772 errno = 0;
773 r = strtol(s, &p, 10);
774
775 if (errno != 0)
776 return errx(-42, "%s: out of range", s);
777
778 while (isspace((unsigned char)*p))
779 p++;
780
781 if (*p)
782 return errx(-42, "%s: bad number", s);
783
784 return (int) r;
785}
786
787static int
788newerf(const char *f1, const char *f2)
789{
790 struct stat b1, b2;
791
792 return (stat(f1, &b1) == 0 &&
793 stat(f2, &b2) == 0 &&
794 b1.st_mtime > b2.st_mtime);
795}
796
797static int
798olderf(const char *f1, const char *f2)
799{
800 struct stat b1, b2;
801
802 return (stat(f1, &b1) == 0 &&
803 stat(f2, &b2) == 0 &&
804 b1.st_mtime < b2.st_mtime);
805}
806
807static int
808equalf(const char *f1, const char *f2)
809{
810 struct stat b1, b2;
811
812 return (stat(f1, &b1) == 0 &&
813 stat(f2, &b2) == 0 &&
814 b1.st_dev == b2.st_dev &&
815 b1.st_ino == b2.st_ino);
816}
817
818static int
819usage(const char *argv0)
820{
821 fprintf(stdout,
822 "usage: %s expression [-- <prog> [args]]\n", argv0);
823 return 0; /* only used in --help. */
824}
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