xref: /freebsd/contrib/bmake/util.c (revision edca4938f74db18d091868237592abbf7e718669) 
1 /*	$NetBSD: util.c,v 1.54 2013/11/26 13:44:41 joerg Exp $	*/
2 
3 /*
4  * Missing stuff from OS's
5  *
6  *	$Id: util.c,v 1.33 2014/01/02 02:29:49 sjg Exp $
7  */
8 #if defined(__MINT__) || defined(__linux__)
9 #include <signal.h>
10 #endif
11 
12 #include "make.h"
13 
14 #ifndef MAKE_NATIVE
15 static char rcsid[] = "$NetBSD: util.c,v 1.54 2013/11/26 13:44:41 joerg Exp $";
16 #else
17 #ifndef lint
18 __RCSID("$NetBSD: util.c,v 1.54 2013/11/26 13:44:41 joerg Exp $");
19 #endif
20 #endif
21 
22 #include <errno.h>
23 #include <time.h>
24 #include <signal.h>
25 
26 #if !defined(HAVE_STRERROR)
27 extern int errno, sys_nerr;
28 extern char *sys_errlist[];
29 
30 char *
31 strerror(int e)
32 {
33     static char buf[100];
34     if (e < 0 || e >= sys_nerr) {
35 	snprintf(buf, sizeof(buf), "Unknown error %d", e);
36 	return buf;
37     }
38     else
39 	return sys_errlist[e];
40 }
41 #endif
42 
43 #if !defined(HAVE_GETENV) || !defined(HAVE_SETENV) || !defined(HAVE_UNSETENV)
44 extern char **environ;
45 
46 static char *
47 findenv(const char *name, int *offset)
48 {
49 	size_t i, len;
50 	char *p, *q;
51 
52 	len = strlen(name);
53 	for (i = 0; (q = environ[i]); i++) {
54 		p = strchr(q, '=');
55 		if (p == NULL || p - q != len)
56 			continue;
57 		if (strncmp(name, q, len) == 0) {
58 			*offset = i;
59 			return q + len + 1;
60 		}
61 	}
62 	*offset = i;
63 	return NULL;
64 }
65 
66 char *
67 getenv(const char *name)
68 {
69     int offset;
70 
71     return(findenv(name, &offset));
72 }
73 
74 int
75 unsetenv(const char *name)
76 {
77 	char **p;
78 	int offset;
79 
80 	if (name == NULL || *name == '\0' || strchr(name, '=') != NULL) {
81 		errno = EINVAL;
82 		return -1;
83 	}
84 
85 	while (findenv(name, &offset))	{ /* if set multiple times */
86 		for (p = &environ[offset];; ++p)
87 			if (!(*p = *(p + 1)))
88 				break;
89 	}
90 	return 0;
91 }
92 
93 int
94 setenv(const char *name, const char *value, int rewrite)
95 {
96 	char *c, **newenv;
97 	const char *cc;
98 	size_t l_value, size;
99 	int offset;
100 
101 	if (name == NULL || value == NULL) {
102 		errno = EINVAL;
103 		return -1;
104 	}
105 
106 	if (*value == '=')			/* no `=' in value */
107 		++value;
108 	l_value = strlen(value);
109 
110 	/* find if already exists */
111 	if ((c = findenv(name, &offset))) {
112 		if (!rewrite)
113 			return 0;
114 		if (strlen(c) >= l_value)	/* old larger; copy over */
115 			goto copy;
116 	} else {					/* create new slot */
117 		size = sizeof(char *) * (offset + 2);
118 		if (savedEnv == environ) {		/* just increase size */
119 			if ((newenv = realloc(savedEnv, size)) == NULL)
120 				return -1;
121 			savedEnv = newenv;
122 		} else {				/* get new space */
123 			/*
124 			 * We don't free here because we don't know if
125 			 * the first allocation is valid on all OS's
126 			 */
127 			if ((savedEnv = malloc(size)) == NULL)
128 				return -1;
129 			(void)memcpy(savedEnv, environ, size - sizeof(char *));
130 		}
131 		environ = savedEnv;
132 		environ[offset + 1] = NULL;
133 	}
134 	for (cc = name; *cc && *cc != '='; ++cc)	/* no `=' in name */
135 		continue;
136 	size = cc - name;
137 	/* name + `=' + value */
138 	if ((environ[offset] = malloc(size + l_value + 2)) == NULL)
139 		return -1;
140 	c = environ[offset];
141 	(void)memcpy(c, name, size);
142 	c += size;
143 	*c++ = '=';
144 copy:
145 	(void)memcpy(c, value, l_value + 1);
146 	return 0;
147 }
148 
149 #ifdef TEST
150 int
151 main(int argc, char *argv[])
152 {
153 	setenv(argv[1], argv[2], 0);
154 	printf("%s\n", getenv(argv[1]));
155 	unsetenv(argv[1]);
156 	printf("%s\n", getenv(argv[1]));
157 	return 0;
158 }
159 #endif
160 
161 #endif
162 
163 
164 #if defined(__hpux__) || defined(__hpux)
165 /* strrcpy():
166  *	Like strcpy, going backwards and returning the new pointer
167  */
168 static char *
169 strrcpy(char *ptr, char *str)
170 {
171     int len = strlen(str);
172 
173     while (len)
174 	*--ptr = str[--len];
175 
176     return (ptr);
177 } /* end strrcpy */
178 
179 
180 char    *sys_siglist[] = {
181         "Signal 0",
182         "Hangup",                       /* SIGHUP    */
183         "Interrupt",                    /* SIGINT    */
184         "Quit",                         /* SIGQUIT   */
185         "Illegal instruction",          /* SIGILL    */
186         "Trace/BPT trap",               /* SIGTRAP   */
187         "IOT trap",                     /* SIGIOT    */
188         "EMT trap",                     /* SIGEMT    */
189         "Floating point exception",     /* SIGFPE    */
190         "Killed",                       /* SIGKILL   */
191         "Bus error",                    /* SIGBUS    */
192         "Segmentation fault",           /* SIGSEGV   */
193         "Bad system call",              /* SIGSYS    */
194         "Broken pipe",                  /* SIGPIPE   */
195         "Alarm clock",                  /* SIGALRM   */
196         "Terminated",                   /* SIGTERM   */
197         "User defined signal 1",        /* SIGUSR1   */
198         "User defined signal 2",        /* SIGUSR2   */
199         "Child exited",                 /* SIGCLD    */
200         "Power-fail restart",           /* SIGPWR    */
201         "Virtual timer expired",        /* SIGVTALRM */
202         "Profiling timer expired",      /* SIGPROF   */
203         "I/O possible",                 /* SIGIO     */
204         "Window size changes",          /* SIGWINDOW */
205         "Stopped (signal)",             /* SIGSTOP   */
206         "Stopped",                      /* SIGTSTP   */
207         "Continued",                    /* SIGCONT   */
208         "Stopped (tty input)",          /* SIGTTIN   */
209         "Stopped (tty output)",         /* SIGTTOU   */
210         "Urgent I/O condition",         /* SIGURG    */
211         "Remote lock lost (NFS)",       /* SIGLOST   */
212         "Signal 31",                    /* reserved  */
213         "DIL signal"                    /* SIGDIL    */
214 };
215 #endif /* __hpux__ || __hpux */
216 
217 #if defined(__hpux__) || defined(__hpux)
218 #include <sys/types.h>
219 #include <sys/syscall.h>
220 #include <sys/signal.h>
221 #include <sys/stat.h>
222 #include <dirent.h>
223 #include <sys/time.h>
224 #include <unistd.h>
225 
226 int
227 killpg(int pid, int sig)
228 {
229     return kill(-pid, sig);
230 }
231 
232 #if !defined(__hpux__) && !defined(__hpux)
233 void
234 srandom(long seed)
235 {
236     srand48(seed);
237 }
238 
239 long
240 random(void)
241 {
242     return lrand48();
243 }
244 #endif
245 
246 #if !defined(__hpux__) && !defined(__hpux)
247 int
248 utimes(char *file, struct timeval tvp[2])
249 {
250     struct utimbuf t;
251 
252     t.actime  = tvp[0].tv_sec;
253     t.modtime = tvp[1].tv_sec;
254     return(utime(file, &t));
255 }
256 #endif
257 
258 #if !defined(BSD) && !defined(d_fileno)
259 # define d_fileno d_ino
260 #endif
261 
262 #ifndef DEV_DEV_COMPARE
263 # define DEV_DEV_COMPARE(a, b) ((a) == (b))
264 #endif
265 #define ISDOT(c) ((c)[0] == '.' && (((c)[1] == '\0') || ((c)[1] == '/')))
266 #define ISDOTDOT(c) ((c)[0] == '.' && ISDOT(&((c)[1])))
267 
268 char *
269 getwd(char *pathname)
270 {
271     DIR    *dp;
272     struct dirent *d;
273     extern int errno;
274 
275     struct stat st_root, st_cur, st_next, st_dotdot;
276     char    pathbuf[MAXPATHLEN], nextpathbuf[MAXPATHLEN * 2];
277     char   *pathptr, *nextpathptr, *cur_name_add;
278 
279     /* find the inode of root */
280     if (stat("/", &st_root) == -1) {
281 	(void)sprintf(pathname,
282 			"getwd: Cannot stat \"/\" (%s)", strerror(errno));
283 	return NULL;
284     }
285     pathbuf[MAXPATHLEN - 1] = '\0';
286     pathptr = &pathbuf[MAXPATHLEN - 1];
287     nextpathbuf[MAXPATHLEN - 1] = '\0';
288     cur_name_add = nextpathptr = &nextpathbuf[MAXPATHLEN - 1];
289 
290     /* find the inode of the current directory */
291     if (lstat(".", &st_cur) == -1) {
292 	(void)sprintf(pathname,
293 			"getwd: Cannot stat \".\" (%s)", strerror(errno));
294 	return NULL;
295     }
296     nextpathptr = strrcpy(nextpathptr, "../");
297 
298     /* Descend to root */
299     for (;;) {
300 
301 	/* look if we found root yet */
302 	if (st_cur.st_ino == st_root.st_ino &&
303 	    DEV_DEV_COMPARE(st_cur.st_dev, st_root.st_dev)) {
304 	    (void)strcpy(pathname, *pathptr != '/' ? "/" : pathptr);
305 	    return (pathname);
306 	}
307 
308 	/* open the parent directory */
309 	if (stat(nextpathptr, &st_dotdot) == -1) {
310 	    (void)sprintf(pathname,
311 			    "getwd: Cannot stat directory \"%s\" (%s)",
312 			    nextpathptr, strerror(errno));
313 	    return NULL;
314 	}
315 	if ((dp = opendir(nextpathptr)) == NULL) {
316 	    (void)sprintf(pathname,
317 			    "getwd: Cannot open directory \"%s\" (%s)",
318 			    nextpathptr, strerror(errno));
319 	    return NULL;
320 	}
321 
322 	/* look in the parent for the entry with the same inode */
323 	if (DEV_DEV_COMPARE(st_dotdot.st_dev, st_cur.st_dev)) {
324 	    /* Parent has same device. No need to stat every member */
325 	    for (d = readdir(dp); d != NULL; d = readdir(dp))
326 		if (d->d_fileno == st_cur.st_ino)
327 		    break;
328 	}
329 	else {
330 	    /*
331 	     * Parent has a different device. This is a mount point so we
332 	     * need to stat every member
333 	     */
334 	    for (d = readdir(dp); d != NULL; d = readdir(dp)) {
335 		if (ISDOT(d->d_name) || ISDOTDOT(d->d_name))
336 		    continue;
337 		(void)strcpy(cur_name_add, d->d_name);
338 		if (lstat(nextpathptr, &st_next) == -1) {
339 		    (void)sprintf(pathname,
340 			"getwd: Cannot stat \"%s\" (%s)",
341 			d->d_name, strerror(errno));
342 		    (void)closedir(dp);
343 		    return NULL;
344 		}
345 		/* check if we found it yet */
346 		if (st_next.st_ino == st_cur.st_ino &&
347 		    DEV_DEV_COMPARE(st_next.st_dev, st_cur.st_dev))
348 		    break;
349 	    }
350 	}
351 	if (d == NULL) {
352 	    (void)sprintf(pathname,
353 		"getwd: Cannot find \".\" in \"..\"");
354 	    (void)closedir(dp);
355 	    return NULL;
356 	}
357 	st_cur = st_dotdot;
358 	pathptr = strrcpy(pathptr, d->d_name);
359 	pathptr = strrcpy(pathptr, "/");
360 	nextpathptr = strrcpy(nextpathptr, "../");
361 	(void)closedir(dp);
362 	*cur_name_add = '\0';
363     }
364 } /* end getwd */
365 
366 #endif /* __hpux */
367 
368 #if !defined(HAVE_GETCWD)
369 char *
370 getcwd(path, sz)
371      char *path;
372      int sz;
373 {
374 	return getwd(path);
375 }
376 #endif
377 
378 /* force posix signals */
379 void (*
380 bmake_signal(int s, void (*a)(int)))(int)
381 {
382     struct sigaction sa, osa;
383 
384     sa.sa_handler = a;
385     sigemptyset(&sa.sa_mask);
386     sa.sa_flags = SA_RESTART;
387 
388     if (sigaction(s, &sa, &osa) == -1)
389 	return SIG_ERR;
390     else
391 	return osa.sa_handler;
392 }
393 
394 #if !defined(HAVE_VSNPRINTF) || !defined(HAVE_VASPRINTF)
395 #include <stdarg.h>
396 #endif
397 
398 #if !defined(HAVE_VSNPRINTF)
399 #if !defined(__osf__)
400 #ifdef _IOSTRG
401 #define STRFLAG	(_IOSTRG|_IOWRT)	/* no _IOWRT: avoid stdio bug */
402 #else
403 #if 0
404 #define STRFLAG	(_IOREAD)		/* XXX: Assume svr4 stdio */
405 #endif
406 #endif /* _IOSTRG */
407 #endif /* __osf__ */
408 
409 int
410 vsnprintf(char *s, size_t n, const char *fmt, va_list args)
411 {
412 #ifdef STRFLAG
413 	FILE fakebuf;
414 
415 	fakebuf._flag = STRFLAG;
416 	/*
417 	 * Some os's are char * _ptr, others are unsigned char *_ptr...
418 	 * We cast to void * to make everyone happy.
419 	 */
420 	fakebuf._ptr = (void *)s;
421 	fakebuf._cnt = n-1;
422 	fakebuf._file = -1;
423 	_doprnt(fmt, args, &fakebuf);
424 	fakebuf._cnt++;
425 	putc('\0', &fakebuf);
426 	if (fakebuf._cnt<0)
427 	    fakebuf._cnt = 0;
428 	return (n-fakebuf._cnt-1);
429 #else
430 #ifndef _PATH_DEVNULL
431 # define _PATH_DEVNULL "/dev/null"
432 #endif
433 	/*
434 	 * Rats... we don't want to clobber anything...
435 	 * do a printf to /dev/null to see how much space we need.
436 	 */
437 	static FILE *nullfp;
438 	int need = 0;			/* XXX what's a useful error return? */
439 
440 	if (!nullfp)
441 		nullfp = fopen(_PATH_DEVNULL, "w");
442 	if (nullfp) {
443 		need = vfprintf(nullfp, fmt, args);
444 		if (need < n)
445 			(void)vsprintf(s, fmt, args);
446 	}
447 	return need;
448 #endif
449 }
450 #endif
451 
452 #if !defined(HAVE_SNPRINTF)
453 int
454 snprintf(char *s, size_t n, const char *fmt, ...)
455 {
456 	va_list ap;
457 	int rv;
458 
459 	va_start(ap, fmt);
460 	rv = vsnprintf(s, n, fmt, ap);
461 	va_end(ap);
462 	return rv;
463 }
464 #endif
465 
466 #if !defined(HAVE_STRFTIME)
467 size_t
468 strftime(char *buf, size_t len, const char *fmt, const struct tm *tm)
469 {
470 	static char months[][4] = {
471 		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
472 		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
473 	};
474 
475 	size_t s;
476 	char *b = buf;
477 
478 	while (*fmt) {
479 		if (len == 0)
480 			return buf - b;
481 		if (*fmt != '%') {
482 			*buf++ = *fmt++;
483 			len--;
484 			continue;
485 		}
486 		switch (*fmt++) {
487 		case '%':
488 			*buf++ = '%';
489 			len--;
490 			if (len == 0) return buf - b;
491 			/*FALLTHROUGH*/
492 		case '\0':
493 			*buf = '%';
494 			s = 1;
495 			break;
496 		case 'k':
497 			s = snprintf(buf, len, "%d", tm->tm_hour);
498 			break;
499 		case 'M':
500 			s = snprintf(buf, len, "%02d", tm->tm_min);
501 			break;
502 		case 'S':
503 			s = snprintf(buf, len, "%02d", tm->tm_sec);
504 			break;
505 		case 'b':
506 			if (tm->tm_mon >= 12)
507 				return buf - b;
508 			s = snprintf(buf, len, "%s", months[tm->tm_mon]);
509 			break;
510 		case 'd':
511 			s = snprintf(buf, len, "%02d", tm->tm_mday);
512 			break;
513 		case 'Y':
514 			s = snprintf(buf, len, "%d", 1900 + tm->tm_year);
515 			break;
516 		default:
517 			s = snprintf(buf, len, "Unsupported format %c",
518 			    fmt[-1]);
519 			break;
520 		}
521 		buf += s;
522 		len -= s;
523 	}
524 }
525 #endif
526 
527 #if !defined(HAVE_KILLPG)
528 #if !defined(__hpux__) && !defined(__hpux)
529 int
530 killpg(int pid, int sig)
531 {
532     return kill(-pid, sig);
533 }
534 #endif
535 #endif
536 
537 #if !defined(HAVE_WARNX)
538 static void
539 vwarnx(const char *fmt, va_list args)
540 {
541 	fprintf(stderr, "%s: ", progname);
542 	if ((fmt)) {
543 		vfprintf(stderr, fmt, args);
544 		fprintf(stderr, ": ");
545 	}
546 }
547 #endif
548 
549 #if !defined(HAVE_WARN)
550 static void
551 vwarn(const char *fmt, va_list args)
552 {
553 	vwarnx(fmt, args);
554 	fprintf(stderr, "%s\n", strerror(errno));
555 }
556 #endif
557 
558 #if !defined(HAVE_ERR)
559 static void
560 verr(int eval, const char *fmt, va_list args)
561 {
562 	vwarn(fmt, args);
563 	exit(eval);
564 }
565 #endif
566 
567 #if !defined(HAVE_ERRX)
568 static void
569 verrx(int eval, const char *fmt, va_list args)
570 {
571 	vwarnx(fmt, args);
572 	exit(eval);
573 }
574 #endif
575 
576 #if !defined(HAVE_ERR)
577 void
578 err(int eval, const char *fmt, ...)
579 {
580         va_list ap;
581 
582         va_start(ap, fmt);
583         verr(eval, fmt, ap);
584         va_end(ap);
585 }
586 #endif
587 
588 #if !defined(HAVE_ERRX)
589 void
590 errx(int eval, const char *fmt, ...)
591 {
592         va_list ap;
593 
594         va_start(ap, fmt);
595         verrx(eval, fmt, ap);
596         va_end(ap);
597 }
598 #endif
599 
600 #if !defined(HAVE_WARN)
601 void
602 warn(const char *fmt, ...)
603 {
604         va_list ap;
605 
606         va_start(ap, fmt);
607         vwarn(fmt, ap);
608         va_end(ap);
609 }
610 #endif
611 
612 #if !defined(HAVE_WARNX)
613 void
614 warnx(const char *fmt, ...)
615 {
616         va_list ap;
617 
618         va_start(ap, fmt);
619         vwarnx(fmt, ap);
620         va_end(ap);
621 }
622 #endif
623