Contents of /trunk/mkinitrd-magellan/busybox/libbb/xfuncs_printf.c
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
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Wed Aug 18 21:56:57 2010 UTC (14 years, 1 month ago) by niro
File MIME type: text/plain
File size: 14685 byte(s)
-updated to busybox-1.17.1
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
6 | * Copyright (C) 2006 Rob Landley |
7 | * Copyright (C) 2006 Denys Vlasenko |
8 | * |
9 | * Licensed under GPL version 2, see file LICENSE in this tarball for details. |
10 | */ |
11 | |
12 | /* We need to have separate xfuncs.c and xfuncs_printf.c because |
13 | * with current linkers, even with section garbage collection, |
14 | * if *.o module references any of XXXprintf functions, you pull in |
15 | * entire printf machinery. Even if you do not use the function |
16 | * which uses XXXprintf. |
17 | * |
18 | * xfuncs.c contains functions (not necessarily xfuncs) |
19 | * which do not pull in printf, directly or indirectly. |
20 | * xfunc_printf.c contains those which do. |
21 | */ |
22 | |
23 | #include "libbb.h" |
24 | |
25 | |
26 | /* All the functions starting with "x" call bb_error_msg_and_die() if they |
27 | * fail, so callers never need to check for errors. If it returned, it |
28 | * succeeded. */ |
29 | |
30 | #ifndef DMALLOC |
31 | /* dmalloc provides variants of these that do abort() on failure. |
32 | * Since dmalloc's prototypes overwrite the impls here as they are |
33 | * included after these prototypes in libbb.h, all is well. |
34 | */ |
35 | // Warn if we can't allocate size bytes of memory. |
36 | void* FAST_FUNC malloc_or_warn(size_t size) |
37 | { |
38 | void *ptr = malloc(size); |
39 | if (ptr == NULL && size != 0) |
40 | bb_error_msg(bb_msg_memory_exhausted); |
41 | return ptr; |
42 | } |
43 | |
44 | // Die if we can't allocate size bytes of memory. |
45 | void* FAST_FUNC xmalloc(size_t size) |
46 | { |
47 | void *ptr = malloc(size); |
48 | if (ptr == NULL && size != 0) |
49 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
50 | return ptr; |
51 | } |
52 | |
53 | // Die if we can't resize previously allocated memory. (This returns a pointer |
54 | // to the new memory, which may or may not be the same as the old memory. |
55 | // It'll copy the contents to a new chunk and free the old one if necessary.) |
56 | void* FAST_FUNC xrealloc(void *ptr, size_t size) |
57 | { |
58 | ptr = realloc(ptr, size); |
59 | if (ptr == NULL && size != 0) |
60 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
61 | return ptr; |
62 | } |
63 | #endif /* DMALLOC */ |
64 | |
65 | // Die if we can't allocate and zero size bytes of memory. |
66 | void* FAST_FUNC xzalloc(size_t size) |
67 | { |
68 | void *ptr = xmalloc(size); |
69 | memset(ptr, 0, size); |
70 | return ptr; |
71 | } |
72 | |
73 | // Die if we can't copy a string to freshly allocated memory. |
74 | char* FAST_FUNC xstrdup(const char *s) |
75 | { |
76 | char *t; |
77 | |
78 | if (s == NULL) |
79 | return NULL; |
80 | |
81 | t = strdup(s); |
82 | |
83 | if (t == NULL) |
84 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
85 | |
86 | return t; |
87 | } |
88 | |
89 | // Die if we can't allocate n+1 bytes (space for the null terminator) and copy |
90 | // the (possibly truncated to length n) string into it. |
91 | char* FAST_FUNC xstrndup(const char *s, int n) |
92 | { |
93 | int m; |
94 | char *t; |
95 | |
96 | if (ENABLE_DEBUG && s == NULL) |
97 | bb_error_msg_and_die("xstrndup bug"); |
98 | |
99 | /* We can just xmalloc(n+1) and strncpy into it, */ |
100 | /* but think about xstrndup("abc", 10000) wastage! */ |
101 | m = n; |
102 | t = (char*) s; |
103 | while (m) { |
104 | if (!*t) break; |
105 | m--; |
106 | t++; |
107 | } |
108 | n -= m; |
109 | t = xmalloc(n + 1); |
110 | t[n] = '\0'; |
111 | |
112 | return memcpy(t, s, n); |
113 | } |
114 | |
115 | // Die if we can't open a file and return a FILE* to it. |
116 | // Notice we haven't got xfread(), This is for use with fscanf() and friends. |
117 | FILE* FAST_FUNC xfopen(const char *path, const char *mode) |
118 | { |
119 | FILE *fp = fopen(path, mode); |
120 | if (fp == NULL) |
121 | bb_perror_msg_and_die("can't open '%s'", path); |
122 | return fp; |
123 | } |
124 | |
125 | // Die if we can't open a file and return a fd. |
126 | int FAST_FUNC xopen3(const char *pathname, int flags, int mode) |
127 | { |
128 | int ret; |
129 | |
130 | ret = open(pathname, flags, mode); |
131 | if (ret < 0) { |
132 | bb_perror_msg_and_die("can't open '%s'", pathname); |
133 | } |
134 | return ret; |
135 | } |
136 | |
137 | // Die if we can't open an existing file and return a fd. |
138 | int FAST_FUNC xopen(const char *pathname, int flags) |
139 | { |
140 | return xopen3(pathname, flags, 0666); |
141 | } |
142 | |
143 | /* Die if we can't open an existing file readonly with O_NONBLOCK |
144 | * and return the fd. |
145 | * Note that for ioctl O_RDONLY is sufficient. |
146 | */ |
147 | int FAST_FUNC xopen_nonblocking(const char *pathname) |
148 | { |
149 | return xopen(pathname, O_RDONLY | O_NONBLOCK); |
150 | } |
151 | |
152 | // Warn if we can't open a file and return a fd. |
153 | int FAST_FUNC open3_or_warn(const char *pathname, int flags, int mode) |
154 | { |
155 | int ret; |
156 | |
157 | ret = open(pathname, flags, mode); |
158 | if (ret < 0) { |
159 | bb_perror_msg("can't open '%s'", pathname); |
160 | } |
161 | return ret; |
162 | } |
163 | |
164 | // Warn if we can't open a file and return a fd. |
165 | int FAST_FUNC open_or_warn(const char *pathname, int flags) |
166 | { |
167 | return open3_or_warn(pathname, flags, 0666); |
168 | } |
169 | |
170 | void FAST_FUNC xunlink(const char *pathname) |
171 | { |
172 | if (unlink(pathname)) |
173 | bb_perror_msg_and_die("can't remove file '%s'", pathname); |
174 | } |
175 | |
176 | void FAST_FUNC xrename(const char *oldpath, const char *newpath) |
177 | { |
178 | if (rename(oldpath, newpath)) |
179 | bb_perror_msg_and_die("can't move '%s' to '%s'", oldpath, newpath); |
180 | } |
181 | |
182 | int FAST_FUNC rename_or_warn(const char *oldpath, const char *newpath) |
183 | { |
184 | int n = rename(oldpath, newpath); |
185 | if (n) |
186 | bb_perror_msg("can't move '%s' to '%s'", oldpath, newpath); |
187 | return n; |
188 | } |
189 | |
190 | void FAST_FUNC xpipe(int filedes[2]) |
191 | { |
192 | if (pipe(filedes)) |
193 | bb_perror_msg_and_die("can't create pipe"); |
194 | } |
195 | |
196 | void FAST_FUNC xdup2(int from, int to) |
197 | { |
198 | if (dup2(from, to) != to) |
199 | bb_perror_msg_and_die("can't duplicate file descriptor"); |
200 | } |
201 | |
202 | // "Renumber" opened fd |
203 | void FAST_FUNC xmove_fd(int from, int to) |
204 | { |
205 | if (from == to) |
206 | return; |
207 | xdup2(from, to); |
208 | close(from); |
209 | } |
210 | |
211 | // Die with an error message if we can't write the entire buffer. |
212 | void FAST_FUNC xwrite(int fd, const void *buf, size_t count) |
213 | { |
214 | if (count) { |
215 | ssize_t size = full_write(fd, buf, count); |
216 | if ((size_t)size != count) |
217 | bb_error_msg_and_die("short write"); |
218 | } |
219 | } |
220 | void FAST_FUNC xwrite_str(int fd, const char *str) |
221 | { |
222 | xwrite(fd, str, strlen(str)); |
223 | } |
224 | |
225 | void FAST_FUNC xclose(int fd) |
226 | { |
227 | if (close(fd)) |
228 | bb_perror_msg_and_die("close failed"); |
229 | } |
230 | |
231 | // Die with an error message if we can't lseek to the right spot. |
232 | off_t FAST_FUNC xlseek(int fd, off_t offset, int whence) |
233 | { |
234 | off_t off = lseek(fd, offset, whence); |
235 | if (off == (off_t)-1) { |
236 | if (whence == SEEK_SET) |
237 | bb_perror_msg_and_die("lseek(%"OFF_FMT"u)", offset); |
238 | bb_perror_msg_and_die("lseek"); |
239 | } |
240 | return off; |
241 | } |
242 | |
243 | // Die with supplied filename if this FILE* has ferror set. |
244 | void FAST_FUNC die_if_ferror(FILE *fp, const char *fn) |
245 | { |
246 | if (ferror(fp)) { |
247 | /* ferror doesn't set useful errno */ |
248 | bb_error_msg_and_die("%s: I/O error", fn); |
249 | } |
250 | } |
251 | |
252 | // Die with an error message if stdout has ferror set. |
253 | void FAST_FUNC die_if_ferror_stdout(void) |
254 | { |
255 | die_if_ferror(stdout, bb_msg_standard_output); |
256 | } |
257 | |
258 | int FAST_FUNC fflush_all(void) |
259 | { |
260 | return fflush(NULL); |
261 | } |
262 | |
263 | |
264 | int FAST_FUNC bb_putchar(int ch) |
265 | { |
266 | return putchar(ch); |
267 | } |
268 | |
269 | /* Die with an error message if we can't copy an entire FILE* to stdout, |
270 | * then close that file. */ |
271 | void FAST_FUNC xprint_and_close_file(FILE *file) |
272 | { |
273 | fflush_all(); |
274 | // copyfd outputs error messages for us. |
275 | if (bb_copyfd_eof(fileno(file), STDOUT_FILENO) == -1) |
276 | xfunc_die(); |
277 | |
278 | fclose(file); |
279 | } |
280 | |
281 | // Die with an error message if we can't malloc() enough space and do an |
282 | // sprintf() into that space. |
283 | char* FAST_FUNC xasprintf(const char *format, ...) |
284 | { |
285 | va_list p; |
286 | int r; |
287 | char *string_ptr; |
288 | |
289 | va_start(p, format); |
290 | r = vasprintf(&string_ptr, format, p); |
291 | va_end(p); |
292 | |
293 | if (r < 0) |
294 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
295 | return string_ptr; |
296 | } |
297 | |
298 | void FAST_FUNC xsetenv(const char *key, const char *value) |
299 | { |
300 | if (setenv(key, value, 1)) |
301 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
302 | } |
303 | |
304 | /* Handles "VAR=VAL" strings, even those which are part of environ |
305 | * _right now_ |
306 | */ |
307 | void FAST_FUNC bb_unsetenv(const char *var) |
308 | { |
309 | char *tp = strchr(var, '='); |
310 | |
311 | if (!tp) { |
312 | unsetenv(var); |
313 | return; |
314 | } |
315 | |
316 | /* In case var was putenv'ed, we can't replace '=' |
317 | * with NUL and unsetenv(var) - it won't work, |
318 | * env is modified by the replacement, unsetenv |
319 | * sees "VAR" instead of "VAR=VAL" and does not remove it! |
320 | * horror :( */ |
321 | tp = xstrndup(var, tp - var); |
322 | unsetenv(tp); |
323 | free(tp); |
324 | } |
325 | |
326 | void FAST_FUNC bb_unsetenv_and_free(char *var) |
327 | { |
328 | bb_unsetenv(var); |
329 | free(var); |
330 | } |
331 | |
332 | // Die with an error message if we can't set gid. (Because resource limits may |
333 | // limit this user to a given number of processes, and if that fills up the |
334 | // setgid() will fail and we'll _still_be_root_, which is bad.) |
335 | void FAST_FUNC xsetgid(gid_t gid) |
336 | { |
337 | if (setgid(gid)) bb_perror_msg_and_die("setgid"); |
338 | } |
339 | |
340 | // Die with an error message if we can't set uid. (See xsetgid() for why.) |
341 | void FAST_FUNC xsetuid(uid_t uid) |
342 | { |
343 | if (setuid(uid)) bb_perror_msg_and_die("setuid"); |
344 | } |
345 | |
346 | // Die if we can't chdir to a new path. |
347 | void FAST_FUNC xchdir(const char *path) |
348 | { |
349 | if (chdir(path)) |
350 | bb_perror_msg_and_die("chdir(%s)", path); |
351 | } |
352 | |
353 | void FAST_FUNC xchroot(const char *path) |
354 | { |
355 | if (chroot(path)) |
356 | bb_perror_msg_and_die("can't change root directory to %s", path); |
357 | } |
358 | |
359 | // Print a warning message if opendir() fails, but don't die. |
360 | DIR* FAST_FUNC warn_opendir(const char *path) |
361 | { |
362 | DIR *dp; |
363 | |
364 | dp = opendir(path); |
365 | if (!dp) |
366 | bb_perror_msg("can't open '%s'", path); |
367 | return dp; |
368 | } |
369 | |
370 | // Die with an error message if opendir() fails. |
371 | DIR* FAST_FUNC xopendir(const char *path) |
372 | { |
373 | DIR *dp; |
374 | |
375 | dp = opendir(path); |
376 | if (!dp) |
377 | bb_perror_msg_and_die("can't open '%s'", path); |
378 | return dp; |
379 | } |
380 | |
381 | // Die with an error message if we can't open a new socket. |
382 | int FAST_FUNC xsocket(int domain, int type, int protocol) |
383 | { |
384 | int r = socket(domain, type, protocol); |
385 | |
386 | if (r < 0) { |
387 | /* Hijack vaguely related config option */ |
388 | #if ENABLE_VERBOSE_RESOLUTION_ERRORS |
389 | const char *s = "INET"; |
390 | if (domain == AF_PACKET) s = "PACKET"; |
391 | if (domain == AF_NETLINK) s = "NETLINK"; |
392 | IF_FEATURE_IPV6(if (domain == AF_INET6) s = "INET6";) |
393 | bb_perror_msg_and_die("socket(AF_%s,%d,%d)", s, type, protocol); |
394 | #else |
395 | bb_perror_msg_and_die("socket"); |
396 | #endif |
397 | } |
398 | |
399 | return r; |
400 | } |
401 | |
402 | // Die with an error message if we can't bind a socket to an address. |
403 | void FAST_FUNC xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen) |
404 | { |
405 | if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind"); |
406 | } |
407 | |
408 | // Die with an error message if we can't listen for connections on a socket. |
409 | void FAST_FUNC xlisten(int s, int backlog) |
410 | { |
411 | if (listen(s, backlog)) bb_perror_msg_and_die("listen"); |
412 | } |
413 | |
414 | /* Die with an error message if sendto failed. |
415 | * Return bytes sent otherwise */ |
416 | ssize_t FAST_FUNC xsendto(int s, const void *buf, size_t len, const struct sockaddr *to, |
417 | socklen_t tolen) |
418 | { |
419 | ssize_t ret = sendto(s, buf, len, 0, to, tolen); |
420 | if (ret < 0) { |
421 | if (ENABLE_FEATURE_CLEAN_UP) |
422 | close(s); |
423 | bb_perror_msg_and_die("sendto"); |
424 | } |
425 | return ret; |
426 | } |
427 | |
428 | // xstat() - a stat() which dies on failure with meaningful error message |
429 | void FAST_FUNC xstat(const char *name, struct stat *stat_buf) |
430 | { |
431 | if (stat(name, stat_buf)) |
432 | bb_perror_msg_and_die("can't stat '%s'", name); |
433 | } |
434 | |
435 | // selinux_or_die() - die if SELinux is disabled. |
436 | void FAST_FUNC selinux_or_die(void) |
437 | { |
438 | #if ENABLE_SELINUX |
439 | int rc = is_selinux_enabled(); |
440 | if (rc == 0) { |
441 | bb_error_msg_and_die("SELinux is disabled"); |
442 | } else if (rc < 0) { |
443 | bb_error_msg_and_die("is_selinux_enabled() failed"); |
444 | } |
445 | #else |
446 | bb_error_msg_and_die("SELinux support is disabled"); |
447 | #endif |
448 | } |
449 | |
450 | int FAST_FUNC ioctl_or_perror_and_die(int fd, unsigned request, void *argp, const char *fmt,...) |
451 | { |
452 | int ret; |
453 | va_list p; |
454 | |
455 | ret = ioctl(fd, request, argp); |
456 | if (ret < 0) { |
457 | va_start(p, fmt); |
458 | bb_verror_msg(fmt, p, strerror(errno)); |
459 | /* xfunc_die can actually longjmp, so be nice */ |
460 | va_end(p); |
461 | xfunc_die(); |
462 | } |
463 | return ret; |
464 | } |
465 | |
466 | int FAST_FUNC ioctl_or_perror(int fd, unsigned request, void *argp, const char *fmt,...) |
467 | { |
468 | va_list p; |
469 | int ret = ioctl(fd, request, argp); |
470 | |
471 | if (ret < 0) { |
472 | va_start(p, fmt); |
473 | bb_verror_msg(fmt, p, strerror(errno)); |
474 | va_end(p); |
475 | } |
476 | return ret; |
477 | } |
478 | |
479 | #if ENABLE_IOCTL_HEX2STR_ERROR |
480 | int FAST_FUNC bb_ioctl_or_warn(int fd, unsigned request, void *argp, const char *ioctl_name) |
481 | { |
482 | int ret; |
483 | |
484 | ret = ioctl(fd, request, argp); |
485 | if (ret < 0) |
486 | bb_simple_perror_msg(ioctl_name); |
487 | return ret; |
488 | } |
489 | int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp, const char *ioctl_name) |
490 | { |
491 | int ret; |
492 | |
493 | ret = ioctl(fd, request, argp); |
494 | if (ret < 0) |
495 | bb_simple_perror_msg_and_die(ioctl_name); |
496 | return ret; |
497 | } |
498 | #else |
499 | int FAST_FUNC bb_ioctl_or_warn(int fd, unsigned request, void *argp) |
500 | { |
501 | int ret; |
502 | |
503 | ret = ioctl(fd, request, argp); |
504 | if (ret < 0) |
505 | bb_perror_msg("ioctl %#x failed", request); |
506 | return ret; |
507 | } |
508 | int FAST_FUNC bb_xioctl(int fd, unsigned request, void *argp) |
509 | { |
510 | int ret; |
511 | |
512 | ret = ioctl(fd, request, argp); |
513 | if (ret < 0) |
514 | bb_perror_msg_and_die("ioctl %#x failed", request); |
515 | return ret; |
516 | } |
517 | #endif |
518 | |
519 | char* FAST_FUNC xmalloc_ttyname(int fd) |
520 | { |
521 | char *buf = xzalloc(128); |
522 | int r = ttyname_r(fd, buf, 127); |
523 | if (r) { |
524 | free(buf); |
525 | buf = NULL; |
526 | } |
527 | return buf; |
528 | } |
529 | |
530 | void FAST_FUNC generate_uuid(uint8_t *buf) |
531 | { |
532 | /* http://www.ietf.org/rfc/rfc4122.txt |
533 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
534 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
535 | * | time_low | |
536 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
537 | * | time_mid | time_hi_and_version | |
538 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
539 | * |clk_seq_and_variant | node (0-1) | |
540 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
541 | * | node (2-5) | |
542 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
543 | * IOW, uuid has this layout: |
544 | * uint32_t time_low (big endian) |
545 | * uint16_t time_mid (big endian) |
546 | * uint16_t time_hi_and_version (big endian) |
547 | * version is a 4-bit field: |
548 | * 1 Time-based |
549 | * 2 DCE Security, with embedded POSIX UIDs |
550 | * 3 Name-based (MD5) |
551 | * 4 Randomly generated |
552 | * 5 Name-based (SHA-1) |
553 | * uint16_t clk_seq_and_variant (big endian) |
554 | * variant is a 3-bit field: |
555 | * 0xx Reserved, NCS backward compatibility |
556 | * 10x The variant specified in rfc4122 |
557 | * 110 Reserved, Microsoft backward compatibility |
558 | * 111 Reserved for future definition |
559 | * uint8_t node[6] |
560 | * |
561 | * For version 4, these bits are set/cleared: |
562 | * time_hi_and_version & 0x0fff | 0x4000 |
563 | * clk_seq_and_variant & 0x3fff | 0x8000 |
564 | */ |
565 | pid_t pid; |
566 | int i; |
567 | |
568 | i = open("/dev/urandom", O_RDONLY); |
569 | if (i >= 0) { |
570 | read(i, buf, 16); |
571 | close(i); |
572 | } |
573 | /* Paranoia. /dev/urandom may be missing. |
574 | * rand() is guaranteed to generate at least [0, 2^15) range, |
575 | * but lowest bits in some libc are not so "random". */ |
576 | srand(monotonic_us()); /* pulls in printf */ |
577 | pid = getpid(); |
578 | while (1) { |
579 | for (i = 0; i < 16; i++) |
580 | buf[i] ^= rand() >> 5; |
581 | if (pid == 0) |
582 | break; |
583 | srand(pid); |
584 | pid = 0; |
585 | } |
586 | |
587 | /* version = 4 */ |
588 | buf[4 + 2 ] = (buf[4 + 2 ] & 0x0f) | 0x40; |
589 | /* variant = 10x */ |
590 | buf[4 + 2 + 2] = (buf[4 + 2 + 2] & 0x3f) | 0x80; |
591 | } |
592 | |
593 | #if BB_MMU |
594 | pid_t FAST_FUNC xfork(void) |
595 | { |
596 | pid_t pid; |
597 | pid = fork(); |
598 | if (pid < 0) /* wtf? */ |
599 | bb_perror_msg_and_die("vfork"+1); |
600 | return pid; |
601 | } |
602 | #endif |