Commit | Line | Data |
---|---|---|
c627d613 AT |
1 | /* |
2 | Copyright (C) Andrew Tridgell 1996 | |
3 | Copyright (C) Paul Mackerras 1996 | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
18 | */ | |
19 | ||
20 | /* | |
21 | Utilities used in rsync | |
22 | ||
23 | tridge, June 1996 | |
24 | */ | |
25 | #include "rsync.h" | |
26 | ||
720b47f2 | 27 | int num_waiting(int fd) |
94481d91 AT |
28 | { |
29 | int len=0; | |
94481d91 | 30 | ioctl(fd,FIONREAD,&len); |
94481d91 AT |
31 | return(len); |
32 | } | |
33 | ||
d9bea2dd | 34 | |
bcacc18b | 35 | struct map_struct *map_file(int fd,OFF_T len) |
c627d613 | 36 | { |
c6e7fcb4 AT |
37 | struct map_struct *ret; |
38 | ret = (struct map_struct *)malloc(sizeof(*ret)); | |
39 | if (!ret) out_of_memory("map_file"); | |
40 | ||
41 | ret->map = NULL; | |
42 | ret->fd = fd; | |
43 | ret->size = len; | |
44 | ret->p = NULL; | |
45 | ret->p_size = 0; | |
46 | ret->p_offset = 0; | |
47 | ret->p_len = 0; | |
48 | ||
d9bea2dd | 49 | #ifdef HAVE_MMAP |
94c9ef1f AT |
50 | if (len < MAX_MAP_SIZE) { |
51 | ret->map = (char *)mmap(NULL,len,PROT_READ,MAP_SHARED,fd,0); | |
52 | if (ret->map == (char *)-1) { | |
53 | ret->map = NULL; | |
54 | } | |
55 | } | |
d9bea2dd | 56 | #endif |
c627d613 AT |
57 | return ret; |
58 | } | |
59 | ||
0b910560 | 60 | |
bcacc18b | 61 | char *map_ptr(struct map_struct *map,OFF_T offset,int len) |
d9bea2dd | 62 | { |
3e607d23 AT |
63 | int nread; |
64 | ||
65 | if (map->map) | |
66 | return map->map+offset; | |
67 | ||
68 | if (len == 0) | |
69 | return NULL; | |
70 | ||
71 | if (len > (map->size-offset)) | |
72 | len = map->size-offset; | |
73 | ||
74 | if (offset >= map->p_offset && | |
75 | offset+len <= map->p_offset+map->p_len) { | |
76 | return (map->p + (offset - map->p_offset)); | |
77 | } | |
78 | ||
79 | len = MAX(len,CHUNK_SIZE); | |
80 | if (len > (map->size-offset)) | |
81 | len = map->size-offset; | |
82 | ||
83 | if (len > map->p_size) { | |
84 | if (map->p) free(map->p); | |
85 | map->p = (char *)malloc(len); | |
86 | if (!map->p) out_of_memory("map_ptr"); | |
87 | map->p_size = len; | |
88 | } | |
89 | ||
90 | map->p_offset = offset; | |
91 | map->p_len = len; | |
92 | ||
93 | if (do_lseek(map->fd,offset,SEEK_SET) != offset) { | |
94 | rprintf(FERROR,"lseek failed in map_ptr\n"); | |
95 | exit_cleanup(1); | |
96 | } | |
97 | ||
98 | if ((nread=read(map->fd,map->p,len)) != len) { | |
99 | if (nread < 0) nread = 0; | |
100 | /* the best we can do is zero the buffer - the file | |
101 | has changed mid transfer! */ | |
102 | memset(map->p+nread, 0, len - nread); | |
103 | } | |
104 | ||
105 | return map->p; | |
d9bea2dd AT |
106 | } |
107 | ||
108 | ||
c6e7fcb4 | 109 | void unmap_file(struct map_struct *map) |
c627d613 | 110 | { |
7bec6a5c | 111 | #ifdef HAVE_MMAP |
c6e7fcb4 AT |
112 | if (map->map) |
113 | munmap(map->map,map->size); | |
7bec6a5c | 114 | #endif |
c6e7fcb4 AT |
115 | if (map->p) free(map->p); |
116 | free(map); | |
c627d613 AT |
117 | } |
118 | ||
119 | ||
c627d613 AT |
120 | /* this is taken from CVS */ |
121 | int piped_child(char **command,int *f_in,int *f_out) | |
122 | { | |
123 | int pid; | |
124 | int to_child_pipe[2]; | |
125 | int from_child_pipe[2]; | |
126 | ||
127 | if (pipe(to_child_pipe) < 0 || | |
128 | pipe(from_child_pipe) < 0) { | |
9486289c | 129 | rprintf(FERROR,"pipe: %s\n",strerror(errno)); |
34ccb63e | 130 | exit_cleanup(1); |
c627d613 AT |
131 | } |
132 | ||
133 | ||
3ba62a83 | 134 | pid = do_fork(); |
c627d613 | 135 | if (pid < 0) { |
9486289c | 136 | rprintf(FERROR,"fork: %s\n",strerror(errno)); |
34ccb63e | 137 | exit_cleanup(1); |
c627d613 AT |
138 | } |
139 | ||
140 | if (pid == 0) | |
141 | { | |
6574b4f7 | 142 | extern int orig_umask; |
c627d613 AT |
143 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || |
144 | close(to_child_pipe[1]) < 0 || | |
145 | close(from_child_pipe[0]) < 0 || | |
146 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { | |
9486289c | 147 | rprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno)); |
34ccb63e | 148 | exit_cleanup(1); |
c627d613 | 149 | } |
773f2bd4 AT |
150 | if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]); |
151 | if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]); | |
6574b4f7 | 152 | umask(orig_umask); |
c627d613 | 153 | execvp(command[0], command); |
9486289c | 154 | rprintf(FERROR,"Failed to exec %s : %s\n", |
c627d613 | 155 | command[0],strerror(errno)); |
34ccb63e | 156 | exit_cleanup(1); |
c627d613 AT |
157 | } |
158 | ||
159 | if (close(from_child_pipe[1]) < 0 || | |
160 | close(to_child_pipe[0]) < 0) { | |
9486289c | 161 | rprintf(FERROR,"Failed to close : %s\n",strerror(errno)); |
34ccb63e | 162 | exit_cleanup(1); |
c627d613 AT |
163 | } |
164 | ||
165 | *f_in = from_child_pipe[0]; | |
166 | *f_out = to_child_pipe[1]; | |
167 | ||
168 | return pid; | |
169 | } | |
170 | ||
366345fe AT |
171 | int local_child(int argc, char **argv,int *f_in,int *f_out) |
172 | { | |
173 | int pid; | |
174 | int to_child_pipe[2]; | |
175 | int from_child_pipe[2]; | |
176 | ||
177 | if (pipe(to_child_pipe) < 0 || | |
178 | pipe(from_child_pipe) < 0) { | |
9486289c | 179 | rprintf(FERROR,"pipe: %s\n",strerror(errno)); |
366345fe AT |
180 | exit_cleanup(1); |
181 | } | |
182 | ||
183 | ||
184 | pid = do_fork(); | |
185 | if (pid < 0) { | |
9486289c | 186 | rprintf(FERROR,"fork: %s\n",strerror(errno)); |
366345fe AT |
187 | exit_cleanup(1); |
188 | } | |
189 | ||
190 | if (pid == 0) { | |
191 | extern int am_sender; | |
192 | extern int am_server; | |
193 | ||
194 | am_sender = !am_sender; | |
195 | am_server = 1; | |
196 | ||
197 | if (dup2(to_child_pipe[0], STDIN_FILENO) < 0 || | |
198 | close(to_child_pipe[1]) < 0 || | |
199 | close(from_child_pipe[0]) < 0 || | |
200 | dup2(from_child_pipe[1], STDOUT_FILENO) < 0) { | |
9486289c | 201 | rprintf(FERROR,"Failed to dup/close : %s\n",strerror(errno)); |
366345fe AT |
202 | exit_cleanup(1); |
203 | } | |
204 | if (to_child_pipe[0] != STDIN_FILENO) close(to_child_pipe[0]); | |
205 | if (from_child_pipe[1] != STDOUT_FILENO) close(from_child_pipe[1]); | |
9486289c | 206 | start_server(STDIN_FILENO, STDOUT_FILENO, argc, argv); |
366345fe AT |
207 | } |
208 | ||
209 | if (close(from_child_pipe[1]) < 0 || | |
210 | close(to_child_pipe[0]) < 0) { | |
9486289c | 211 | rprintf(FERROR,"Failed to close : %s\n",strerror(errno)); |
366345fe AT |
212 | exit_cleanup(1); |
213 | } | |
214 | ||
215 | *f_in = from_child_pipe[0]; | |
216 | *f_out = to_child_pipe[1]; | |
217 | ||
218 | return pid; | |
219 | } | |
220 | ||
221 | ||
c627d613 AT |
222 | |
223 | void out_of_memory(char *str) | |
224 | { | |
9486289c | 225 | rprintf(FERROR,"ERROR: out of memory in %s\n",str); |
575f2fca AT |
226 | exit_cleanup(1); |
227 | } | |
228 | ||
229 | void overflow(char *str) | |
230 | { | |
9486289c | 231 | rprintf(FERROR,"ERROR: buffer overflow in %s\n",str); |
34ccb63e | 232 | exit_cleanup(1); |
c627d613 AT |
233 | } |
234 | ||
235 | ||
c627d613 AT |
236 | |
237 | int set_modtime(char *fname,time_t modtime) | |
238 | { | |
31e12522 AT |
239 | extern int dry_run; |
240 | if (dry_run) return 0; | |
241 | { | |
1e9f155a | 242 | #ifdef HAVE_UTIMBUF |
31e12522 AT |
243 | struct utimbuf tbuf; |
244 | tbuf.actime = time(NULL); | |
245 | tbuf.modtime = modtime; | |
246 | return utime(fname,&tbuf); | |
c627d613 | 247 | #elif defined(HAVE_UTIME) |
31e12522 AT |
248 | time_t t[2]; |
249 | t[0] = time(NULL); | |
250 | t[1] = modtime; | |
251 | return utime(fname,t); | |
c627d613 | 252 | #else |
31e12522 AT |
253 | struct timeval t[2]; |
254 | t[0].tv_sec = time(NULL); | |
255 | t[0].tv_usec = 0; | |
256 | t[1].tv_sec = modtime; | |
257 | t[1].tv_usec = 0; | |
258 | return utimes(fname,t); | |
c627d613 | 259 | #endif |
31e12522 | 260 | } |
c627d613 | 261 | } |
94481d91 | 262 | |
720b47f2 AT |
263 | |
264 | ||
265 | /**************************************************************************** | |
266 | Set a fd into blocking/nonblocking mode. Uses POSIX O_NONBLOCK if available, | |
267 | else | |
268 | if SYSV use O_NDELAY | |
269 | if BSD use FNDELAY | |
270 | ****************************************************************************/ | |
271 | int set_blocking(int fd, int set) | |
272 | { | |
273 | int val; | |
274 | #ifdef O_NONBLOCK | |
275 | #define FLAG_TO_SET O_NONBLOCK | |
276 | #else | |
277 | #ifdef SYSV | |
278 | #define FLAG_TO_SET O_NDELAY | |
279 | #else /* BSD */ | |
280 | #define FLAG_TO_SET FNDELAY | |
281 | #endif | |
282 | #endif | |
283 | ||
284 | if((val = fcntl(fd, F_GETFL, 0)) == -1) | |
285 | return -1; | |
286 | if(set) /* Turn blocking on - ie. clear nonblock flag */ | |
287 | val &= ~FLAG_TO_SET; | |
288 | else | |
289 | val |= FLAG_TO_SET; | |
290 | return fcntl( fd, F_SETFL, val); | |
291 | #undef FLAG_TO_SET | |
292 | } | |
6574b4f7 AT |
293 | |
294 | /**************************************************************************** | |
295 | create any necessary directories in fname. Unfortunately we don't know | |
296 | what perms to give the directory when this is called so we need to rely | |
297 | on the umask | |
298 | ****************************************************************************/ | |
299 | int create_directory_path(char *fname) | |
300 | { | |
301 | extern int orig_umask; | |
302 | char *p; | |
303 | ||
304 | while (*fname == '/') fname++; | |
305 | while (strncmp(fname,"./",2)==0) fname += 2; | |
306 | ||
307 | p = fname; | |
308 | while ((p=strchr(p,'/'))) { | |
309 | *p = 0; | |
1b2d733a | 310 | do_mkdir(fname,0777 & ~orig_umask); |
6574b4f7 AT |
311 | *p = '/'; |
312 | p++; | |
313 | } | |
314 | return 0; | |
315 | } | |
950ab32d AT |
316 | |
317 | ||
318 | /* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted. | |
319 | Return LEN upon success, write's (negative) error code otherwise. | |
320 | ||
321 | derived from GNU C's cccp.c. | |
322 | */ | |
323 | int full_write(int desc, char *ptr, int len) | |
324 | { | |
325 | int total_written; | |
326 | ||
327 | total_written = 0; | |
328 | while (len > 0) { | |
329 | int written = write (desc, ptr, len); | |
330 | if (written < 0) { | |
331 | #ifdef EINTR | |
332 | if (errno == EINTR) | |
333 | continue; | |
334 | #endif | |
335 | return written; | |
336 | } | |
337 | total_written += written; | |
338 | ptr += written; | |
339 | len -= written; | |
340 | } | |
341 | return total_written; | |
342 | } | |
343 | ||
344 | /* Read LEN bytes at PTR from descriptor DESC, retrying if interrupted. | |
345 | Return the actual number of bytes read, zero for EOF, or negative | |
346 | for an error. | |
347 | ||
348 | derived from GNU C's cccp.c. */ | |
349 | int safe_read(int desc, char *ptr, int len) | |
350 | { | |
351 | int n_chars; | |
352 | ||
353 | if (len <= 0) | |
354 | return len; | |
355 | ||
356 | #ifdef EINTR | |
357 | do { | |
358 | n_chars = read(desc, ptr, len); | |
359 | } while (n_chars < 0 && errno == EINTR); | |
360 | #else | |
361 | n_chars = read(desc, ptr, len); | |
362 | #endif | |
363 | ||
364 | return n_chars; | |
365 | } | |
366 | ||
367 | ||
368 | /* copy a file - this is used in conjunction with the --temp-dir option */ | |
369 | int copy_file(char *source, char *dest, mode_t mode) | |
370 | { | |
371 | int ifd; | |
372 | int ofd; | |
373 | char buf[1024 * 8]; | |
374 | int len; /* Number of bytes read into `buf'. */ | |
375 | ||
376 | ifd = open(source, O_RDONLY); | |
377 | if (ifd == -1) { | |
9486289c | 378 | rprintf(FERROR,"open %s: %s\n", |
950ab32d AT |
379 | source,strerror(errno)); |
380 | return -1; | |
381 | } | |
382 | ||
31e12522 | 383 | if (do_unlink(dest) && errno != ENOENT) { |
9486289c | 384 | rprintf(FERROR,"unlink %s: %s\n", |
950ab32d AT |
385 | dest,strerror(errno)); |
386 | return -1; | |
387 | } | |
388 | ||
31e12522 | 389 | ofd = do_open(dest, O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, mode); |
950ab32d | 390 | if (ofd < 0) { |
9486289c | 391 | rprintf(FERROR,"open %s: %s\n", |
950ab32d AT |
392 | dest,strerror(errno)); |
393 | close(ifd); | |
394 | return -1; | |
395 | } | |
396 | ||
397 | while ((len = safe_read(ifd, buf, sizeof(buf))) > 0) { | |
398 | if (full_write(ofd, buf, len) < 0) { | |
9486289c | 399 | rprintf(FERROR,"write %s: %s\n", |
950ab32d AT |
400 | dest,strerror(errno)); |
401 | close(ifd); | |
402 | close(ofd); | |
403 | return -1; | |
404 | } | |
405 | } | |
406 | ||
407 | close(ifd); | |
408 | close(ofd); | |
409 | ||
410 | if (len < 0) { | |
9486289c | 411 | rprintf(FERROR,"read %s: %s\n", |
950ab32d AT |
412 | source,strerror(errno)); |
413 | return -1; | |
414 | } | |
415 | ||
416 | return 0; | |
417 | } | |
feaa89c4 AT |
418 | |
419 | /* sleep for a while via select */ | |
420 | void u_sleep(int usec) | |
421 | { | |
422 | struct timeval tv; | |
423 | ||
424 | tv.tv_sec = 0; | |
425 | tv.tv_usec = usec; | |
426 | select(0, NULL, NULL, NULL, &tv); | |
427 | } | |
3ba62a83 AT |
428 | |
429 | ||
430 | static pid_t all_pids[10]; | |
431 | static int num_pids; | |
432 | ||
433 | /* fork and record the pid of the child */ | |
434 | pid_t do_fork(void) | |
435 | { | |
436 | pid_t newpid = fork(); | |
437 | ||
438 | if (newpid) { | |
439 | all_pids[num_pids++] = newpid; | |
440 | } | |
441 | return newpid; | |
442 | } | |
443 | ||
444 | /* kill all children */ | |
445 | void kill_all(int sig) | |
446 | { | |
447 | int i; | |
448 | for (i=0;i<num_pids;i++) { | |
449 | if (all_pids[i] != getpid()) | |
450 | kill(all_pids[i], sig); | |
451 | } | |
452 | } | |
9486289c | 453 | |
7a6421fa AT |
454 | /* like strncpy but does not 0 fill the buffer and always null |
455 | terminates (thus it can use maxlen+1 space in d) */ | |
456 | void strlcpy(char *d, char *s, int maxlen) | |
457 | { | |
458 | int len = strlen(s); | |
459 | if (len > maxlen) len = maxlen; | |
460 | memcpy(d, s, len); | |
461 | d[len] = 0; | |
462 | } | |
8ef4ffd6 | 463 | |
e42c9458 AT |
464 | /* like strncat but does not 0 fill the buffer and always null |
465 | terminates (thus it can use maxlen+1 space in d) */ | |
466 | void strlcat(char *d, char *s, int maxlen) | |
467 | { | |
468 | int len1 = strlen(d); | |
469 | int len2 = strlen(s); | |
470 | if (len1+len2 > maxlen) { | |
471 | len2 = maxlen-len1; | |
472 | } | |
473 | if (len2 > 0) { | |
474 | memcpy(d+len1, s, len2); | |
475 | d[len1+len2] = 0; | |
476 | } | |
477 | } | |
478 | ||
8ef4ffd6 AT |
479 | /* turn a user name into a uid */ |
480 | int name_to_uid(char *name, uid_t *uid) | |
481 | { | |
482 | struct passwd *pass; | |
483 | if (!name || !*name) return 0; | |
484 | pass = getpwnam(name); | |
485 | if (pass) { | |
486 | *uid = pass->pw_uid; | |
487 | return 1; | |
488 | } | |
489 | return 0; | |
490 | } | |
491 | ||
492 | /* turn a group name into a gid */ | |
493 | int name_to_gid(char *name, gid_t *gid) | |
494 | { | |
495 | struct group *grp; | |
496 | if (!name || !*name) return 0; | |
497 | grp = getgrnam(name); | |
498 | if (grp) { | |
499 | *gid = grp->gr_gid; | |
500 | return 1; | |
501 | } | |
502 | return 0; | |
503 | } | |
504 | ||
ff8b29b8 | 505 | |
0c515f17 AT |
506 | /**************************************************************************** |
507 | check if a process exists. | |
508 | ****************************************************************************/ | |
509 | int process_exists(int pid) | |
510 | { | |
511 | return(kill(pid,0) == 0 || errno != ESRCH); | |
512 | } | |
513 | ||
31593dd6 AT |
514 | /* lock a byte range in a open file */ |
515 | int lock_range(int fd, int offset, int len) | |
0c515f17 | 516 | { |
31593dd6 | 517 | struct flock lock; |
0c515f17 | 518 | |
31593dd6 AT |
519 | lock.l_type = F_WRLCK; |
520 | lock.l_whence = SEEK_SET; | |
521 | lock.l_start = offset; | |
522 | lock.l_len = len; | |
523 | lock.l_pid = 0; | |
524 | ||
525 | return fcntl(fd,F_SETLK,&lock) == 0; | |
0c515f17 | 526 | } |
874895d5 AT |
527 | |
528 | ||
087bf010 | 529 | static void glob_expand_one(char *s, char **argv, int *argc, int maxargs) |
874895d5 AT |
530 | { |
531 | #ifndef HAVE_GLOB | |
e42c9458 | 532 | if (!*s) s = "."; |
087bf010 | 533 | argv[*argc] = strdup(s); |
874895d5 AT |
534 | (*argc)++; |
535 | return; | |
536 | #else | |
537 | glob_t globbuf; | |
538 | int i; | |
539 | ||
e42c9458 AT |
540 | if (!*s) s = "."; |
541 | ||
087bf010 AT |
542 | argv[*argc] = strdup(s); |
543 | ||
874895d5 AT |
544 | memset(&globbuf, 0, sizeof(globbuf)); |
545 | glob(argv[*argc], 0, NULL, &globbuf); | |
546 | if (globbuf.gl_pathc == 0) { | |
547 | (*argc)++; | |
548 | globfree(&globbuf); | |
549 | return; | |
550 | } | |
551 | for (i=0; i<(maxargs - (*argc)) && i<globbuf.gl_pathc;i++) { | |
552 | if (i == 0) free(argv[*argc]); | |
553 | argv[(*argc) + i] = strdup(globbuf.gl_pathv[i]); | |
554 | if (!argv[(*argc) + i]) out_of_memory("glob_expand"); | |
555 | } | |
556 | globfree(&globbuf); | |
557 | (*argc) += i; | |
558 | #endif | |
559 | } | |
5a96ee05 | 560 | |
087bf010 AT |
561 | void glob_expand(char *base, char **argv, int *argc, int maxargs) |
562 | { | |
563 | char *s = argv[*argc]; | |
564 | char *p, *q; | |
565 | ||
566 | if (!s || !*s) return; | |
567 | ||
e42c9458 AT |
568 | if (strncmp(s, base, strlen(base)) == 0) { |
569 | s += strlen(base); | |
570 | } | |
571 | ||
087bf010 AT |
572 | s = strdup(s); |
573 | if (!s) out_of_memory("glob_expand"); | |
574 | ||
575 | q = s; | |
576 | while ((p = strstr(q,base)) && ((*argc) < maxargs)) { | |
577 | if (p != q && *(p-1) == ' ' && p[strlen(base)] == '/') { | |
578 | /* split it at this point */ | |
579 | *(p-1) = 0; | |
580 | glob_expand_one(q, argv, argc, maxargs); | |
e42c9458 | 581 | q = p+strlen(base)+1; |
087bf010 AT |
582 | } else { |
583 | q++; | |
584 | } | |
585 | } | |
586 | ||
587 | if (*q && (*argc < maxargs)) glob_expand_one(q, argv, argc, maxargs); | |
588 | ||
589 | free(s); | |
590 | } | |
5a96ee05 AT |
591 | |
592 | /******************************************************************* | |
593 | convert a string to lower case | |
594 | ********************************************************************/ | |
595 | void strlower(char *s) | |
596 | { | |
597 | while (*s) { | |
598 | if (isupper(*s)) *s = tolower(*s); | |
599 | s++; | |
600 | } | |
601 | } | |
e42c9458 AT |
602 | |
603 | /* this is like vsnprintf but the 'n' limit does not include | |
604 | the terminating null. So if you have a 1024 byte buffer then | |
605 | pass 1023 for n */ | |
606 | int vslprintf(char *str, int n, const char *format, va_list ap) | |
607 | { | |
608 | #ifdef HAVE_VSNPRINTF | |
609 | int ret = vsnprintf(str, n, format, ap); | |
610 | if (ret > n || ret < 0) { | |
611 | str[n] = 0; | |
612 | return -1; | |
613 | } | |
614 | str[ret] = 0; | |
615 | return ret; | |
616 | #else | |
617 | static char *buf; | |
618 | static int len=MAXPATHLEN*8; | |
619 | int ret; | |
620 | ||
621 | /* this code is NOT a proper vsnprintf() implementation. It | |
622 | relies on the fact that all calls to slprintf() in rsync | |
623 | pass strings which have already been checked to be less | |
624 | than MAXPATHLEN in length and never more than 2 strings are | |
625 | concatenated. This means the above buffer is absolutely | |
626 | ample and can never be overflowed. | |
627 | ||
628 | In the future we would like to replace this with a proper | |
629 | vsnprintf() implementation but right now we need a solution | |
630 | that is secure and portable. This is it. */ | |
631 | ||
632 | if (!buf) { | |
633 | buf = malloc(len); | |
634 | if (!buf) { | |
635 | /* can't call debug or we would recurse */ | |
8d9dc9f9 | 636 | exit_cleanup(1); |
e42c9458 AT |
637 | } |
638 | } | |
639 | ||
f72399f8 AT |
640 | vsprintf(buf, format, ap); |
641 | ret = strlen(buf); | |
642 | if (ret > n) { | |
643 | /* yikes! */ | |
8d9dc9f9 | 644 | exit_cleanup(1); |
e42c9458 | 645 | } |
f72399f8 | 646 | buf[ret] = 0; |
e42c9458 | 647 | |
f72399f8 | 648 | memcpy(str, buf, ret+1); |
e42c9458 AT |
649 | |
650 | return ret; | |
651 | #endif | |
652 | } | |
653 | ||
654 | ||
655 | /* like snprintf but always null terminates */ | |
656 | int slprintf(char *str, int n, char *format, ...) | |
657 | { | |
658 | va_list ap; | |
659 | int ret; | |
660 | ||
661 | va_start(ap, format); | |
662 | ret = vslprintf(str,n,format,ap); | |
663 | va_end(ap); | |
664 | return ret; | |
665 | } | |
8d9dc9f9 | 666 |