xref: /freebsd/contrib/bmake/util.c (revision b077aed33b7b6aefca7b17ddb250cf521f938613) 
1 /*	$NetBSD: util.c,v 1.78 2021/12/15 12:58:01 rillig Exp $	*/
2 
3 /*
4  * Missing stuff from OS's
5  *
6  *	$Id: util.c,v 1.50 2021/12/21 18:47:24 sjg Exp $
7  */
8 
9 #include <sys/param.h>
10 #include <errno.h>
11 #include <time.h>
12 #include <signal.h>
13 
14 #include "make.h"
15 
16 MAKE_RCSID("$NetBSD: util.c,v 1.78 2021/12/15 12:58:01 rillig Exp $");
17 
18 #if !defined(MAKE_NATIVE) && !defined(HAVE_STRERROR)
19 extern int errno, sys_nerr;
20 extern char *sys_errlist[];
21 
22 char *
23 strerror(int e)
24 {
25 	static char buf[100];
26 	if (e < 0 || e >= sys_nerr) {
27 		snprintf(buf, sizeof buf, "Unknown error %d", e);
28 		return buf;
29 	} else
30 		return sys_errlist[e];
31 }
32 #endif
33 
34 #if !defined(HAVE_GETENV) || !defined(HAVE_SETENV) || !defined(HAVE_UNSETENV)
35 extern char **environ;
36 
37 static char *
38 findenv(const char *name, int *offset)
39 {
40 	size_t i, len;
41 	char *p, *q;
42 
43 	len = strlen(name);
44 	for (i = 0; (q = environ[i]); i++) {
45 		p = strchr(q, '=');
46 		if (p == NULL || p - q != len)
47 			continue;
48 		if (strncmp(name, q, len) == 0) {
49 			*offset = i;
50 			return q + len + 1;
51 		}
52 	}
53 	*offset = i;
54 	return NULL;
55 }
56 
57 char *
58 getenv(const char *name)
59 {
60 	int offset;
61 
62 	return findenv(name, &offset);
63 }
64 
65 int
66 unsetenv(const char *name)
67 {
68 	char **p;
69 	int offset;
70 
71 	if (name == NULL || *name == '\0' || strchr(name, '=') != NULL) {
72 		errno = EINVAL;
73 		return -1;
74 	}
75 
76 	while (findenv(name, &offset)) {	/* if set multiple times */
77 		for (p = &environ[offset];; p++)
78 			if (!(*p = *(p + 1)))
79 				break;
80 	}
81 	return 0;
82 }
83 
84 int
85 setenv(const char *name, const char *value, int rewrite)
86 {
87 	char *c, **newenv;
88 	const char *cc;
89 	size_t l_value, size;
90 	int offset;
91 
92 	if (name == NULL || value == NULL) {
93 		errno = EINVAL;
94 		return -1;
95 	}
96 
97 	if (*value == '=')	/* no `=' in value */
98 		value++;
99 	l_value = strlen(value);
100 
101 	/* find if already exists */
102 	if ((c = findenv(name, &offset))) {
103 		if (!rewrite)
104 			return 0;
105 		if (strlen(c) >= l_value)	/* old larger; copy over */
106 			goto copy;
107 	} else {					/* create new slot */
108 		size = sizeof(char *) * (offset + 2);
109 		if (savedEnv == environ) {		/* just increase size */
110 			if ((newenv = realloc(savedEnv, size)) == NULL)
111 				return -1;
112 			savedEnv = newenv;
113 		} else {				/* get new space */
114 			/*
115 			 * We don't free here because we don't know if
116 			 * the first allocation is valid on all OS's
117 			 */
118 			if ((savedEnv = malloc(size)) == NULL)
119 				return -1;
120 			(void)memcpy(savedEnv, environ, size - sizeof(char *));
121 		}
122 		environ = savedEnv;
123 		environ[offset + 1] = NULL;
124 	}
125 	for (cc = name; *cc && *cc != '='; cc++)	/* no `=' in name */
126 		continue;
127 	size = cc - name;
128 	/* name + `=' + value */
129 	if ((environ[offset] = malloc(size + l_value + 2)) == NULL)
130 		return -1;
131 	c = environ[offset];
132 	(void)memcpy(c, name, size);
133 	c += size;
134 	*c++ = '=';
135 copy:
136 	(void)memcpy(c, value, l_value + 1);
137 	return 0;
138 }
139 
140 #ifdef TEST
141 int
142 main(int argc, char *argv[])
143 {
144 	setenv(argv[1], argv[2], 0);
145 	printf("%s\n", getenv(argv[1]));
146 	unsetenv(argv[1]);
147 	printf("%s\n", getenv(argv[1]));
148 	return 0;
149 }
150 #endif
151 
152 #endif
153 
154 
155 #if defined(__hpux__) || defined(__hpux)
156 /*
157  * strrcpy():
158  *	Like strcpy, going backwards and returning the new pointer
159  */
160 static char *
161 strrcpy(char *ptr, char *str)
162 {
163 	int len = strlen(str);
164 
165 	while (len != 0)
166 		*--ptr = str[--len];
167 
168 	return ptr;
169 }
170 
171 char *sys_siglist[] = {
172 	"Signal 0",
173 	"Hangup",			/* SIGHUP    */
174 	"Interrupt",			/* SIGINT    */
175 	"Quit",				/* SIGQUIT   */
176 	"Illegal instruction",		/* SIGILL    */
177 	"Trace/BPT trap",		/* SIGTRAP   */
178 	"IOT trap",			/* SIGIOT    */
179 	"EMT trap",			/* SIGEMT    */
180 	"Floating point exception",	/* SIGFPE    */
181 	"Killed",			/* SIGKILL   */
182 	"Bus error",			/* SIGBUS    */
183 	"Segmentation fault",		/* SIGSEGV   */
184 	"Bad system call",		/* SIGSYS    */
185 	"Broken pipe",			/* SIGPIPE   */
186 	"Alarm clock",			/* SIGALRM   */
187 	"Terminated",			/* SIGTERM   */
188 	"User defined signal 1",	/* SIGUSR1   */
189 	"User defined signal 2",	/* SIGUSR2   */
190 	"Child exited",			/* SIGCLD    */
191 	"Power-fail restart",		/* SIGPWR    */
192 	"Virtual timer expired",	/* SIGVTALRM */
193 	"Profiling timer expired",	/* SIGPROF   */
194 	"I/O possible",			/* SIGIO     */
195 	"Window size changes",		/* SIGWINDOW */
196 	"Stopped (signal)",		/* SIGSTOP   */
197 	"Stopped",			/* SIGTSTP   */
198 	"Continued",			/* SIGCONT   */
199 	"Stopped (tty input)",		/* SIGTTIN   */
200 	"Stopped (tty output)",		/* SIGTTOU   */
201 	"Urgent I/O condition",		/* SIGURG    */
202 	"Remote lock lost (NFS)",	/* SIGLOST   */
203 	"Signal 31",			/* reserved  */
204 	"DIL signal"			/* SIGDIL    */
205 };
206 #endif /* __hpux__ || __hpux */
207 
208 #if defined(__hpux__) || defined(__hpux)
209 #include <sys/types.h>
210 #include <sys/syscall.h>
211 #include <sys/signal.h>
212 #include <sys/stat.h>
213 #include <dirent.h>
214 #include <sys/time.h>
215 #include <unistd.h>
216 
217 int
218 killpg(int pid, int sig)
219 {
220 	return kill(-pid, sig);
221 }
222 
223 #if !defined(BSD) && !defined(d_fileno)
224 # define d_fileno d_ino
225 #endif
226 
227 #ifndef DEV_DEV_COMPARE
228 # define DEV_DEV_COMPARE(a, b) ((a) == (b))
229 #endif
230 #define ISDOT(c) ((c)[0] == '.' && (((c)[1] == '\0') || ((c)[1] == '/')))
231 #define ISDOTDOT(c) ((c)[0] == '.' && ISDOT(&((c)[1])))
232 
233 char *
234 getwd(char *pathname)
235 {
236     DIR    *dp;
237     struct dirent *d;
238     extern int errno;
239 
240     struct stat st_root, st_cur, st_next, st_dotdot;
241     char    pathbuf[MAXPATHLEN], nextpathbuf[MAXPATHLEN * 2];
242     char   *pathptr, *nextpathptr, *cur_name_add;
243 
244     /* find the inode of root */
245     if (stat("/", &st_root) == -1) {
246 	(void)sprintf(pathname,
247 			"getwd: Cannot stat \"/\" (%s)", strerror(errno));
248 	return NULL;
249     }
250     pathbuf[MAXPATHLEN - 1] = '\0';
251     pathptr = &pathbuf[MAXPATHLEN - 1];
252     nextpathbuf[MAXPATHLEN - 1] = '\0';
253     cur_name_add = nextpathptr = &nextpathbuf[MAXPATHLEN - 1];
254 
255     /* find the inode of the current directory */
256     if (lstat(".", &st_cur) == -1) {
257 	(void)sprintf(pathname,
258 			"getwd: Cannot stat \".\" (%s)", strerror(errno));
259 	return NULL;
260     }
261     nextpathptr = strrcpy(nextpathptr, "../");
262 
263     /* Descend to root */
264     for (;;) {
265 
266 	/* look if we found root yet */
267 	if (st_cur.st_ino == st_root.st_ino &&
268 	    DEV_DEV_COMPARE(st_cur.st_dev, st_root.st_dev)) {
269 	    (void)strcpy(pathname, *pathptr != '/' ? "/" : pathptr);
270 	    return pathname;
271 	}
272 
273 	/* open the parent directory */
274 	if (stat(nextpathptr, &st_dotdot) == -1) {
275 	    (void)sprintf(pathname,
276 			    "getwd: Cannot stat directory \"%s\" (%s)",
277 			    nextpathptr, strerror(errno));
278 	    return NULL;
279 	}
280 	if ((dp = opendir(nextpathptr)) == NULL) {
281 	    (void)sprintf(pathname,
282 			    "getwd: Cannot open directory \"%s\" (%s)",
283 			    nextpathptr, strerror(errno));
284 	    return NULL;
285 	}
286 
287 	/* look in the parent for the entry with the same inode */
288 	if (DEV_DEV_COMPARE(st_dotdot.st_dev, st_cur.st_dev)) {
289 	    /* Parent has same device. No need to stat every member */
290 	    for (d = readdir(dp); d != NULL; d = readdir(dp))
291 		if (d->d_fileno == st_cur.st_ino)
292 		    break;
293 	} else {
294 	    /*
295 	     * Parent has a different device. This is a mount point so we
296 	     * need to stat every member
297 	     */
298 	    for (d = readdir(dp); d != NULL; d = readdir(dp)) {
299 		if (ISDOT(d->d_name) || ISDOTDOT(d->d_name))
300 		    continue;
301 		(void)strcpy(cur_name_add, d->d_name);
302 		if (lstat(nextpathptr, &st_next) == -1) {
303 		    (void)sprintf(pathname,
304 			"getwd: Cannot stat \"%s\" (%s)",
305 			d->d_name, strerror(errno));
306 		    (void)closedir(dp);
307 		    return NULL;
308 		}
309 		/* check if we found it yet */
310 		if (st_next.st_ino == st_cur.st_ino &&
311 		    DEV_DEV_COMPARE(st_next.st_dev, st_cur.st_dev))
312 		    break;
313 	    }
314 	}
315 	if (d == NULL) {
316 	    (void)sprintf(pathname,
317 		"getwd: Cannot find \".\" in \"..\"");
318 	    (void)closedir(dp);
319 	    return NULL;
320 	}
321 	st_cur = st_dotdot;
322 	pathptr = strrcpy(pathptr, d->d_name);
323 	pathptr = strrcpy(pathptr, "/");
324 	nextpathptr = strrcpy(nextpathptr, "../");
325 	(void)closedir(dp);
326 	*cur_name_add = '\0';
327     }
328 } /* end getwd */
329 
330 #endif /* __hpux */
331 
332 #if !defined(HAVE_GETCWD)
333 char *
334 getcwd(path, sz)
335      char *path;
336      int sz;
337 {
338 	return getwd(path);
339 }
340 #endif
341 
342 #if !defined(HAVE_SIGACTION)
343 #include "sigact.h"
344 #endif
345 
346 /* force posix signals */
347 SignalProc
348 bmake_signal(int s, SignalProc a)
349 {
350 	struct sigaction sa, osa;
351 
352 	sa.sa_handler = a;
353 	sigemptyset(&sa.sa_mask);
354 	sa.sa_flags = SA_RESTART;
355 
356 	if (sigaction(s, &sa, &osa) == -1)
357 		return SIG_ERR;
358 	else
359 		return osa.sa_handler;
360 }
361 
362 #if !defined(HAVE_VSNPRINTF) || !defined(HAVE_VASPRINTF)
363 #include <stdarg.h>
364 #endif
365 
366 #if !defined(HAVE_VSNPRINTF)
367 #if !defined(__osf__)
368 #ifdef _IOSTRG
369 #define STRFLAG	(_IOSTRG|_IOWRT)	/* no _IOWRT: avoid stdio bug */
370 #else
371 #if 0
372 #define STRFLAG	(_IOREAD)		/* XXX: Assume svr4 stdio */
373 #endif
374 #endif /* _IOSTRG */
375 #endif /* __osf__ */
376 
377 int
378 vsnprintf(char *s, size_t n, const char *fmt, va_list args)
379 {
380 #ifdef STRFLAG
381 	FILE fakebuf;
382 
383 	fakebuf._flag = STRFLAG;
384 	/*
385 	 * Some os's are char * _ptr, others are unsigned char *_ptr...
386 	 * We cast to void * to make everyone happy.
387 	 */
388 	fakebuf._ptr = (void *)s;
389 	fakebuf._cnt = n - 1;
390 	fakebuf._file = -1;
391 	_doprnt(fmt, args, &fakebuf);
392 	fakebuf._cnt++;
393 	putc('\0', &fakebuf);
394 	if (fakebuf._cnt < 0)
395 		fakebuf._cnt = 0;
396 	return n - fakebuf._cnt - 1;
397 #else
398 #ifndef _PATH_DEVNULL
399 # define _PATH_DEVNULL "/dev/null"
400 #endif
401 	/*
402 	 * Rats... we don't want to clobber anything...
403 	 * do a printf to /dev/null to see how much space we need.
404 	 */
405 	static FILE *nullfp;
406 	int need = 0;			/* XXX what's a useful error return? */
407 
408 	if (!nullfp)
409 		nullfp = fopen(_PATH_DEVNULL, "w");
410 	if (nullfp) {
411 		need = vfprintf(nullfp, fmt, args);
412 		if (need < n)
413 			(void)vsprintf(s, fmt, args);
414 	}
415 	return need;
416 #endif
417 }
418 #endif
419 
420 #if !defined(HAVE_SNPRINTF)
421 int
422 snprintf(char *s, size_t n, const char *fmt, ...)
423 {
424 	va_list ap;
425 	int rv;
426 
427 	va_start(ap, fmt);
428 	rv = vsnprintf(s, n, fmt, ap);
429 	va_end(ap);
430 	return rv;
431 }
432 #endif
433 
434 #if !defined(HAVE_STRFTIME)
435 size_t
436 strftime(char *buf, size_t len, const char *fmt, const struct tm *tm)
437 {
438 	static char months[][4] = {
439 		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
440 		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
441 	};
442 
443 	size_t s;
444 	char *b = buf;
445 
446 	while (*fmt) {
447 		if (len == 0)
448 			return buf - b;
449 		if (*fmt != '%') {
450 			*buf++ = *fmt++;
451 			len--;
452 			continue;
453 		}
454 		switch (*fmt++) {
455 		case '%':
456 			*buf++ = '%';
457 			len--;
458 			if (len == 0) return buf - b;
459 			/*FALLTHROUGH*/
460 		case '\0':
461 			*buf = '%';
462 			s = 1;
463 			break;
464 		case 'k':
465 			s = snprintf(buf, len, "%d", tm->tm_hour);
466 			break;
467 		case 'M':
468 			s = snprintf(buf, len, "%02d", tm->tm_min);
469 			break;
470 		case 'S':
471 			s = snprintf(buf, len, "%02d", tm->tm_sec);
472 			break;
473 		case 'b':
474 			if (tm->tm_mon >= 12)
475 				return buf - b;
476 			s = snprintf(buf, len, "%s", months[tm->tm_mon]);
477 			break;
478 		case 'd':
479 			s = snprintf(buf, len, "%02d", tm->tm_mday);
480 			break;
481 		case 'Y':
482 			s = snprintf(buf, len, "%d", 1900 + tm->tm_year);
483 			break;
484 		default:
485 			s = snprintf(buf, len, "Unsupported format %c",
486 			    fmt[-1]);
487 			break;
488 		}
489 		buf += s;
490 		len -= s;
491 	}
492 	return buf - b;
493 }
494 #endif
495 
496 #if !defined(HAVE_KILLPG)
497 #if !defined(__hpux__) && !defined(__hpux)
498 int
499 killpg(int pid, int sig)
500 {
501     return kill(-pid, sig);
502 }
503 #endif
504 #endif
505 
506 #if !defined(HAVE_WARNX)
507 static void
508 vwarnx(const char *fmt, va_list args)
509 {
510 	fprintf(stderr, "%s: ", progname);
511 	if ((fmt)) {
512 		vfprintf(stderr, fmt, args);
513 		fprintf(stderr, ": ");
514 	}
515 }
516 #endif
517 
518 #if !defined(HAVE_WARN)
519 static void
520 vwarn(const char *fmt, va_list args)
521 {
522 	vwarnx(fmt, args);
523 	fprintf(stderr, "%s\n", strerror(errno));
524 }
525 #endif
526 
527 #if !defined(HAVE_ERR)
528 static void
529 verr(int eval, const char *fmt, va_list args)
530 {
531 	vwarn(fmt, args);
532 	exit(eval);
533 }
534 #endif
535 
536 #if !defined(HAVE_ERRX)
537 static void
538 verrx(int eval, const char *fmt, va_list args)
539 {
540 	vwarnx(fmt, args);
541 	exit(eval);
542 }
543 #endif
544 
545 #if !defined(HAVE_ERR)
546 void
547 err(int eval, const char *fmt, ...)
548 {
549         va_list ap;
550 
551         va_start(ap, fmt);
552         verr(eval, fmt, ap);
553         va_end(ap);
554 }
555 #endif
556 
557 #if !defined(HAVE_ERRX)
558 void
559 errx(int eval, const char *fmt, ...)
560 {
561         va_list ap;
562 
563         va_start(ap, fmt);
564         verrx(eval, fmt, ap);
565         va_end(ap);
566 }
567 #endif
568 
569 #if !defined(HAVE_WARN)
570 void
571 warn(const char *fmt, ...)
572 {
573         va_list ap;
574 
575         va_start(ap, fmt);
576         vwarn(fmt, ap);
577         va_end(ap);
578 }
579 #endif
580 
581 #if !defined(HAVE_WARNX)
582 void
583 warnx(const char *fmt, ...)
584 {
585         va_list ap;
586 
587         va_start(ap, fmt);
588         vwarnx(fmt, ap);
589         va_end(ap);
590 }
591 #endif
592 
593 #ifdef HAVE_INTTYPES_H
594 #include <inttypes.h>
595 #elif defined(HAVE_STDINT_H)
596 #include <stdint.h>
597 #endif
598 #ifdef HAVE_LIMITS_H
599 #include <limits.h>
600 #endif
601 
602 #ifndef NUM_TYPE
603 # ifdef HAVE_LONG_LONG_INT
604 #   define NUM_TYPE long long
605 # elif defined(_INT64_T_DECLARED) || defined(int64_t)
606 #   define NUM_TYPE int64_t
607 # endif
608 #endif
609 
610 #ifdef NUM_TYPE
611 #if !defined(HAVE_STRTOLL)
612 #define BCS_ONLY
613 #define _FUNCNAME strtoll
614 #define __INT NUM_TYPE
615 #undef __INT_MIN
616 #undef __INT_MAX
617 #ifdef LLONG_MAX
618 # define __INT_MIN LLONG_MIN
619 # define __INT_MAX LLONG_MAX
620 #elif defined(INT64_MAX)
621 # define __INT_MIN INT64_MIN
622 # define __INT_MAX INT64_MAX
623 #endif
624 #ifndef _DIAGASSERT
625 # define _DIAGASSERT(e)
626 #endif
627 #ifndef __UNCONST
628 # define __UNCONST(a)      ((void *)(unsigned long)(const void *)(a))
629 #endif
630 #include "_strtol.h"
631 #endif
632 
633 #endif
634 
635 #if !defined(HAVE_STRTOL)
636 #define BCS_ONLY
637 #define _FUNCNAME strtol
638 #define __INT long
639 #undef __INT_MIN
640 #undef __INT_MAX
641 #define __INT_MIN LONG_MIN
642 #define __INT_MAX LONG_MAX
643 #ifndef _DIAGASSERT
644 # define _DIAGASSERT(e)
645 #endif
646 #ifndef __UNCONST
647 # define __UNCONST(a)      ((void *)(unsigned long)(const void *)(a))
648 #endif
649 #include "_strtol.h"
650 #endif
651 
652 #if !defined(HAVE_STRTOUL)
653 #define BCS_ONLY
654 #define _FUNCNAME strtoul
655 #define __INT unsigned long
656 #undef __INT_MIN
657 #undef __INT_MAX
658 #define __INT_MIN 0
659 #define __INT_MAX ULONG_MAX
660 #ifndef _DIAGASSERT
661 # define _DIAGASSERT(e)
662 #endif
663 #ifndef __UNCONST
664 # define __UNCONST(a)      ((void *)(unsigned long)(const void *)(a))
665 #endif
666 #include "_strtol.h"
667 #endif
668