util.c revision 1.72 1 /* $NetBSD: util.c,v 1.72 2020/12/15 20:39:15 rillig Exp $ */
2
3 /*
4 * Missing stuff from OS's
5 */
6 #if defined(__MINT__) || defined(__linux__)
7 #include <signal.h>
8 #endif
9
10 #include <sys/param.h>
11
12 #include <errno.h>
13 #include <time.h>
14 #include <signal.h>
15
16 #include "make.h"
17
18 MAKE_RCSID("$NetBSD: util.c,v 1.72 2020/12/15 20:39:15 rillig Exp $");
19
20 #if !defined(MAKE_NATIVE) && !defined(HAVE_STRERROR)
21 extern int errno, sys_nerr;
22 extern char *sys_errlist[];
23
24 char *
25 strerror(int e)
26 {
27 static char buf[100];
28 if (e < 0 || e >= sys_nerr) {
29 snprintf(buf, sizeof buf, "Unknown error %d", e);
30 return buf;
31 } else
32 return sys_errlist[e];
33 }
34 #endif
35
36 #if !defined(MAKE_NATIVE) && !defined(HAVE_SETENV)
37 extern char **environ;
38
39 static char *
40 findenv(const char *name, int *offset)
41 {
42 size_t i, len;
43 char *p, *q;
44
45 len = strlen(name);
46 for (i = 0; (q = environ[i]); i++) {
47 p = strchr(q, '=');
48 if (p == NULL || p - q != len)
49 continue;
50 if (strncmp(name, q, len) == 0) {
51 *offset = i;
52 return q + len + 1;
53 }
54 }
55 *offset = i;
56 return NULL;
57 }
58
59 char *
60 getenv(const char *name)
61 {
62 int offset;
63
64 return findenv(name, &offset);
65 }
66
67 int
68 unsetenv(const char *name)
69 {
70 char **p;
71 int offset;
72
73 if (name == NULL || *name == '\0' || strchr(name, '=') != NULL) {
74 errno = EINVAL;
75 return -1;
76 }
77
78 while (findenv(name, &offset)) { /* if set multiple times */
79 for (p = &environ[offset];; ++p)
80 if (!(*p = *(p + 1)))
81 break;
82 }
83 return 0;
84 }
85
86 int
87 setenv(const char *name, const char *value, int rewrite)
88 {
89 char *c, **newenv;
90 const char *cc;
91 size_t l_value, size;
92 int offset;
93
94 if (name == NULL || value == NULL) {
95 errno = EINVAL;
96 return -1;
97 }
98
99 if (*value == '=') /* no `=' in value */
100 value++;
101 l_value = strlen(value);
102
103 /* find if already exists */
104 if ((c = findenv(name, &offset))) {
105 if (!rewrite)
106 return 0;
107 if (strlen(c) >= l_value) /* old larger; copy over */
108 goto copy;
109 } else { /* create new slot */
110 size = sizeof(char *) * (offset + 2);
111 if (savedEnv == environ) { /* just increase size */
112 if ((newenv = realloc(savedEnv, size)) == NULL)
113 return -1;
114 savedEnv = newenv;
115 } else { /* get new space */
116 /*
117 * We don't free here because we don't know if
118 * the first allocation is valid on all OS's
119 */
120 if ((savedEnv = malloc(size)) == NULL)
121 return -1;
122 (void)memcpy(savedEnv, environ, size - sizeof(char *));
123 }
124 environ = savedEnv;
125 environ[offset + 1] = NULL;
126 }
127 for (cc = name; *cc && *cc != '='; ++cc) /* no `=' in name */
128 continue;
129 size = cc - name;
130 /* name + `=' + value */
131 if ((environ[offset] = malloc(size + l_value + 2)) == NULL)
132 return -1;
133 c = environ[offset];
134 (void)memcpy(c, name, size);
135 c += size;
136 *c++ = '=';
137 copy:
138 (void)memcpy(c, value, l_value + 1);
139 return 0;
140 }
141
142 #ifdef TEST
143 int
144 main(int argc, char *argv[])
145 {
146 setenv(argv[1], argv[2], 0);
147 printf("%s\n", getenv(argv[1]));
148 unsetenv(argv[1]);
149 printf("%s\n", getenv(argv[1]));
150 return 0;
151 }
152 #endif
153
154 #endif
155
156 #if defined(__hpux__) || defined(__hpux)
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 } /* end strrcpy */
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 #endif /* __hpux */
330
331 /* force posix signals */
332 SignalProc
333 bmake_signal(int s, SignalProc a)
334 {
335 struct sigaction sa, osa;
336
337 sa.sa_handler = a;
338 sigemptyset(&sa.sa_mask);
339 sa.sa_flags = SA_RESTART;
340
341 if (sigaction(s, &sa, &osa) == -1)
342 return SIG_ERR;
343 else
344 return osa.sa_handler;
345 }
346
347 #if !defined(MAKE_NATIVE) && !defined(HAVE_VSNPRINTF)
348 #include <stdarg.h>
349
350 #if !defined(__osf__)
351 #ifdef _IOSTRG
352 #define STRFLAG (_IOSTRG|_IOWRT) /* no _IOWRT: avoid stdio bug */
353 #else
354 #if 0
355 #define STRFLAG (_IOREAD) /* XXX: Assume svr4 stdio */
356 #endif
357 #endif /* _IOSTRG */
358 #endif /* __osf__ */
359
360 int
361 vsnprintf(char *s, size_t n, const char *fmt, va_list args)
362 {
363 #ifdef STRFLAG
364 FILE fakebuf;
365
366 fakebuf._flag = STRFLAG;
367 /*
368 * Some os's are char * _ptr, others are unsigned char *_ptr...
369 * We cast to void * to make everyone happy.
370 */
371 fakebuf._ptr = (void *)s;
372 fakebuf._cnt = n - 1;
373 fakebuf._file = -1;
374 _doprnt(fmt, args, &fakebuf);
375 fakebuf._cnt++;
376 putc('\0', &fakebuf);
377 if (fakebuf._cnt < 0)
378 fakebuf._cnt = 0;
379 return n - fakebuf._cnt - 1;
380 #else
381 ::: "error: vsnprintf must be available";
382 #endif
383 }
384
385 int
386 snprintf(char *s, size_t n, const char *fmt, ...)
387 {
388 va_list ap;
389 int rv;
390
391 va_start(ap, fmt);
392 rv = vsnprintf(s, n, fmt, ap);
393 va_end(ap);
394 return rv;
395 }
396
397 #endif
398