Commit | Line | Data |
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f87489ac WJ |
1 | /* Supporting routines which may sometimes be missing. |
2 | Copyright (C) 1988 Free Software Foundation | |
3 | ||
4 | This file is part of GNU Tar. | |
5 | ||
6 | GNU Tar is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 1, or (at your option) | |
9 | any later version. | |
10 | ||
11 | GNU Tar is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GNU Tar; see the file COPYING. If not, write to | |
18 | the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
19 | ||
20 | /* | |
21 | * @(#)port.c 1.15 87/11/05 by John Gilmore, 1986 | |
22 | * | |
23 | * These are routines not available in all environments. | |
24 | * | |
25 | * I know this introduces an extra level of subroutine calls and is | |
26 | * slightly slower. Frankly, my dear, I don't give a damn. Let the | |
27 | * Missed-Em Vee losers suffer a little. This software is proud to | |
28 | * have been written on a BSD system. | |
29 | */ | |
30 | #include <stdio.h> | |
31 | #include <sys/types.h> | |
32 | #include <sys/stat.h> | |
33 | #include <signal.h> | |
34 | #include <errno.h> | |
35 | ||
36 | #if defined(__MSDOS__) || defined(USG) | |
37 | #include <fcntl.h> | |
38 | #else | |
39 | #include <sys/file.h> | |
40 | #endif | |
41 | ||
42 | #include "tar.h" | |
43 | #include "port.h" | |
44 | ||
45 | #ifdef USG | |
46 | #include <string.h> | |
47 | #else | |
48 | extern size_t strlen(); | |
49 | #endif | |
50 | ||
51 | extern long baserec; | |
52 | /* | |
53 | * Some people (e.g. V7) don't have a #define for these. | |
54 | */ | |
55 | #ifndef O_BINARY | |
56 | #define O_BINARY 0 | |
57 | #endif | |
58 | #ifndef O_RDONLY | |
59 | #define O_RDONLY 0 | |
60 | #endif | |
61 | #ifndef NULL | |
62 | #define NULL 0 | |
63 | #endif | |
64 | ||
65 | /* JF: modified so all configuration information can appear here, instead of | |
66 | being scattered through the file. Add all the machine-dependent #ifdefs | |
67 | here */ | |
68 | #undef WANT_DUMB_GET_DATE/* WANT_DUMB_GET_DATE --> get_date() */ | |
69 | #undef WANT_VALLOC /* WANT_VALLOC --> valloc() */ | |
70 | #undef WANT_MKDIR /* WANT_MKDIR --> mkdir() rmdir() */ | |
71 | #undef WANT_STRING /* WANT_STRING --> index() bcopy() bzero() bcmp() */ | |
72 | #undef WANT_BZERO /* WANT_BZERO --> bzero() bcmp() execlp() */ | |
73 | /* EMUL_OPEN3 --> open3() */ | |
74 | #undef WANT_MKNOD /* WANT_MKNOD --> mknod() link() chown() geteuid() */ | |
75 | #undef WANT_UTILS /* WANT_UTILS --> panic() ck_*() *_buffer() | |
76 | merge_sort() quote_copy_string() un_quote_string() */ | |
77 | #undef WANT_CK_PIPE /* WANT_CK_PIPE --> ck_pipe() */ | |
78 | #undef WANT_GETWD /* WANT_GETWD --> getwd() */ | |
79 | #undef WANT_STRSTR /* WANT_STRSTR --> strstr() */ | |
80 | #undef WANT_FTRUNCATE /* WANT_FTRUNCATE --> frtruncate() */ | |
81 | ||
82 | /* Define only ONE of these four . . . */ | |
83 | /* #undef DOPRNT_MSG /* Define this one if you have _doprnt() and | |
84 | no varargs support */ | |
85 | /* #undef VARARGS_MSG /* Define this one if you have varargs.h and | |
86 | vfprintf() */ | |
87 | /* #undef STDC_MSG /* Define this one if you are using ANSI C and | |
88 | and have vfprintf() */ | |
89 | /* #undef LOSING_MSG /* Define this one if you don't have any of the | |
90 | above */ | |
91 | #ifdef USG | |
92 | #define WANT_STRING | |
93 | #define WANT_VALLOC | |
94 | ||
95 | #if defined(sgi) && defined(mips) | |
96 | #define WANT_GETWD | |
97 | #endif | |
98 | ||
99 | #if defined(i386) | |
100 | #define WANT_FTRUNCATE | |
101 | #endif | |
102 | ||
103 | #endif | |
104 | ||
105 | #ifdef hpux | |
106 | #define WANT_VALLOC | |
107 | #endif | |
108 | ||
109 | #ifdef MINIX | |
110 | #define WANT_BZERO | |
111 | #endif | |
112 | ||
113 | #ifdef __MSDOS__ | |
114 | char TTY_NAME[] = "con"; | |
115 | ||
116 | #define WANT_STRING | |
117 | #define WANT_MKNOD | |
118 | #define WANT_UTILS | |
119 | #define WANT_VALLOC | |
120 | ||
121 | #if (!defined(STDC_MSG) && !defined(DOPRNT_MSG) && !defined(VARARGS_MSG) && !defined(LOSING_MSG)) | |
122 | #ifdef __STDC__ | |
123 | #define STDC_MSG | |
124 | #else | |
125 | #define LOSING_MSG | |
126 | #endif | |
127 | #endif | |
128 | ||
129 | #else /* not MSDOS */ | |
130 | char TTY_NAME[] ="/dev/tty"; | |
131 | ||
132 | #define WANT_UTILS | |
133 | #define WANT_CK_PIPE | |
134 | #ifndef HAVE_STRSTR | |
135 | #define WANT_STRSTR | |
136 | #endif | |
137 | ||
138 | #if (!defined(STDC_MSG) && !defined(DOPRNT_MSG) && !defined(VARARGS_MSG) && !defined(LOSING_MSG)) | |
139 | #ifdef BSD42 | |
140 | /* BSD systems should do this even if __STDC__, because | |
141 | we might be using an ANSI compiler without an ANSI library. (sigh) */ | |
142 | #ifdef sparc | |
143 | #define LOSING_MSG | |
144 | #else | |
145 | #define DOPRNT_MSG | |
146 | #endif | |
147 | #else /* not BSD */ | |
148 | #ifdef __STDC__ | |
149 | #define STDC_MSG | |
150 | #else /* not ANSI C */ | |
151 | #define LOSING_MSG | |
152 | #endif /* not ANSI C */ | |
153 | #endif /* not BSD */ | |
154 | #endif /* Need to define some form of _MSG */ | |
155 | #endif /* not MSDOS */ | |
156 | ||
157 | /* End of system-dependent #ifdefs */ | |
158 | ||
159 | #ifdef WANT_DUMB_GET_DATE | |
160 | /* JF a get_date() routine takes a date/time/etc and turns it into a time_t */ | |
161 | /* This one is a quick hack I wrote in about five minutes to see if the N | |
162 | option works. Someone should replace it with one that works */ | |
163 | ||
164 | /* This get_date takes an arg of the form mm/dd/yyyy hh:mm:ss and turns it | |
165 | into a time_t . Its not well tested or anything. . . */ | |
166 | /* In general, you should use the get_date() supplied in getdate.y */ | |
167 | ||
168 | #define OFF_FROM GMT 18000 /* Change for your time zone! */ | |
169 | ||
170 | time_t | |
171 | get_date(str) | |
172 | char *str; | |
173 | { | |
174 | int month,day,year,hour,minute,second; | |
175 | time_t ret; | |
176 | int n; | |
177 | ||
178 | #define SECS_PER_YEAR (365L*SECS_PER_DAY) | |
179 | #define SECS_PER_LEAP_YEAR (366L*SECS_PER_DAY) | |
180 | ||
181 | #define SECS_PER_DAY (24L*60*60) | |
182 | static int days_per_month[2][12] = { | |
183 | 31,28,31,30,31,30,31,31,30,31,30,31, | |
184 | 31,29,31,30,31,30,31,31,30,31,30,31 | |
185 | }; | |
186 | ||
187 | static int days_per_year[2]={365,366}; | |
188 | ||
189 | month=day=year=hour=minute=second=0; | |
190 | n=sscanf(str,"%d/%d/%d %d:%d:%d",&month,&day,&year,&hour,&minute,&second); | |
191 | if(n<3) | |
192 | return 0; | |
193 | if(year<100) | |
194 | year+=1900; | |
195 | if(year<1970) | |
196 | return 0; | |
197 | ret=0; | |
198 | ||
199 | ret+=OFF_FROM_GMT; | |
200 | ||
201 | for(n=1970;n<year;n++) | |
202 | if(n%4==0 && n%400!=0) | |
203 | ret+=SECS_PER_LEAP_YEAR; | |
204 | else | |
205 | ret+=SECS_PER_YEAR; | |
206 | ||
207 | month--; | |
208 | for(n=0;n<month;n++) { | |
209 | if(year%4==0 && year%400!=0) | |
210 | ret+=SECS_PER_DAY*days_per_month[1][n]; | |
211 | else | |
212 | ret+=SECS_PER_DAY*days_per_month[0][n]; | |
213 | } | |
214 | ret+=SECS_PER_DAY*(day-1); | |
215 | ret+=second+minute*60+hour*60*60; | |
216 | return ret; | |
217 | } | |
218 | #endif | |
219 | ||
220 | #ifdef WANT_VALLOC | |
221 | /* | |
222 | * valloc() does a malloc() on a page boundary. On some systems, | |
223 | * this can make large block I/O more efficient. | |
224 | */ | |
225 | char * | |
226 | valloc (size) | |
227 | unsigned size; | |
228 | { | |
229 | extern char *malloc (); | |
230 | return (malloc (size)); | |
231 | } | |
232 | #endif | |
233 | /* | |
234 | * NMKDIR.C | |
235 | * | |
236 | * Written by Robert Rother, Mariah Corporation, August 1985. | |
237 | * | |
238 | * I wrote this out of shear disgust with myself because I couldn't | |
239 | * figure out how to do this in /bin/sh. | |
240 | * | |
241 | * If you want it, it's yours. All I ask in return is that if you | |
242 | * figure out how to do this in a Bourne Shell script you send me | |
243 | * a copy. | |
244 | * sdcsvax!rmr or rmr@uscd | |
245 | * | |
246 | * Severely hacked over by John Gilmore to make a 4.2BSD compatible | |
247 | * subroutine. 11Mar86; hoptoad!gnu | |
248 | * | |
249 | * Modified by rmtodd@uokmax 6-28-87 -- when making an already existing dir, | |
250 | * subroutine didn't return EEXIST. It does now. | |
251 | */ | |
252 | ||
253 | /* | |
254 | * Make a directory. Compatible with the mkdir() system call on 4.2BSD. | |
255 | */ | |
256 | #ifdef WANT_MKDIR | |
257 | int | |
258 | mkdir(dpath, dmode) | |
259 | char *dpath; | |
260 | int dmode; | |
261 | { | |
262 | int cpid, status; | |
263 | struct stat statbuf; | |
264 | extern int errno; | |
265 | ||
266 | if (stat(dpath,&statbuf) == 0) { | |
267 | errno = EEXIST; /* Stat worked, so it already exists */ | |
268 | return -1; | |
269 | } | |
270 | ||
271 | /* If stat fails for a reason other than non-existence, return error */ | |
272 | if (errno != ENOENT) return -1; | |
273 | ||
274 | switch (cpid = fork()) { | |
275 | ||
276 | case -1: /* Error in fork() */ | |
277 | return(-1); /* Errno is set already */ | |
278 | ||
279 | case 0: /* Child process */ | |
280 | /* | |
281 | * Cheap hack to set mode of new directory. Since this | |
282 | * child process is going away anyway, we zap its umask. | |
283 | * FIXME, this won't suffice to set SUID, SGID, etc. on this | |
284 | * directory. Does anybody care? | |
285 | */ | |
286 | status = umask(0); /* Get current umask */ | |
287 | status = umask(status | (0777 & ~dmode)); /* Set for mkdir */ | |
288 | execl("/bin/mkdir", "mkdir", dpath, (char *)0); | |
289 | _exit(-1); /* Can't exec /bin/mkdir */ | |
290 | ||
291 | default: /* Parent process */ | |
292 | while (cpid != wait(&status)) ; /* Wait for kid to finish */ | |
293 | } | |
294 | ||
295 | if (TERM_SIGNAL(status) != 0 || TERM_VALUE(status) != 0) { | |
296 | errno = EIO; /* We don't know why, but */ | |
297 | return -1; /* /bin/mkdir failed */ | |
298 | } | |
299 | ||
300 | return 0; | |
301 | } | |
302 | int | |
303 | rmdir(dpath) | |
304 | char *dpath; | |
305 | { | |
306 | int cpid, status; | |
307 | struct stat statbuf; | |
308 | extern int errno; | |
309 | ||
310 | if (stat(dpath,&statbuf) != 0) { | |
311 | /* Stat just set errno. We don't have to */ | |
312 | return -1; | |
313 | } | |
314 | ||
315 | switch (cpid = fork()) { | |
316 | ||
317 | case -1: /* Error in fork() */ | |
318 | return(-1); /* Errno is set already */ | |
319 | ||
320 | case 0: /* Child process */ | |
321 | execl("/bin/rmdir", "rmdir", dpath, (char *)0); | |
322 | _exit(-1); /* Can't exec /bin/mkdir */ | |
323 | ||
324 | default: /* Parent process */ | |
325 | while (cpid != wait(&status)) ; /* Wait for kid to finish */ | |
326 | } | |
327 | ||
328 | if (TERM_SIGNAL(status) != 0 || TERM_VALUE(status) != 0) { | |
329 | errno = EIO; /* We don't know why, but */ | |
330 | return -1; /* /bin/mkdir failed */ | |
331 | } | |
332 | ||
333 | return 0; | |
334 | } | |
335 | #endif | |
336 | ||
337 | #ifdef WANT_STRING | |
338 | /* | |
339 | * Translate V7 style into Sys V style. | |
340 | */ | |
341 | #include <string.h> | |
342 | #ifndef __MSDOS__ | |
343 | #include <memory.h> | |
344 | #endif | |
345 | ||
346 | char * | |
347 | index (s, c) | |
348 | char *s; | |
349 | int c; | |
350 | { | |
351 | return (strchr (s, c)); | |
352 | } | |
353 | ||
354 | char * | |
355 | rindex(s,c) | |
356 | char *s; | |
357 | int c; | |
358 | { | |
359 | return strrchr(s,c); | |
360 | } | |
361 | ||
362 | void | |
363 | bcopy (s1, s2, n) | |
364 | char *s1, *s2; | |
365 | int n; | |
366 | { | |
367 | (void) memcpy (s2, s1, n); | |
368 | } | |
369 | ||
370 | void | |
371 | bzero (s1, n) | |
372 | char *s1; | |
373 | int n; | |
374 | { | |
375 | (void) memset(s1, 0, n); | |
376 | } | |
377 | ||
378 | int | |
379 | bcmp(s1, s2, n) | |
380 | char *s1, *s2; | |
381 | int n; | |
382 | { | |
383 | return memcmp(s1, s2, n); | |
384 | } | |
385 | #endif | |
386 | ||
387 | #ifdef WANT_BZERO | |
388 | /* Minix has bcopy but not bzero, and no memset. Thanks, Andy. */ | |
389 | void | |
390 | bzero (s1, n) | |
391 | register char *s1; | |
392 | register int n; | |
393 | { | |
394 | while (n--) *s1++ = '\0'; | |
395 | } | |
396 | ||
397 | /* It also has no bcmp() */ | |
398 | int | |
399 | bcmp (s1, s2, n) | |
400 | register char *s1,*s2; | |
401 | register int n; | |
402 | { | |
403 | for ( ; n-- ; ++s1, ++s2) { | |
404 | if (*s1 != *s2) return *s1 - *s2; | |
405 | } | |
406 | return 0; | |
407 | } | |
408 | ||
409 | /* | |
410 | * Groan, Minix doesn't have execlp either! | |
411 | * | |
412 | * execlp(file,arg0,arg1...argn,(char *)NULL) | |
413 | * exec a program, automatically searching for the program through | |
414 | * all the directories on the PATH. | |
415 | * | |
416 | * This version is naive about variable argument lists, it assumes | |
417 | * a straightforward C calling sequence. If your system has odd stacks | |
418 | * *and* doesn't have execlp, YOU get to fix it. | |
419 | */ | |
420 | int | |
421 | execlp(filename, arg0) | |
422 | char *filename, *arg0; | |
423 | { | |
424 | register char *p, *path; | |
425 | register char *fnbuffer; | |
426 | char **argstart = &arg0; | |
427 | struct stat statbuf; | |
428 | extern char **environ; | |
429 | extern int errno; | |
430 | extern char *malloc(), *getenv(), *index(); | |
431 | ||
432 | if ((p = getenv("PATH")) == NULL) { | |
433 | /* couldn't find path variable -- try to exec given filename */ | |
434 | return execve(filename, argstart, environ); | |
435 | } | |
436 | ||
437 | /* | |
438 | * make a place to build the filename. We malloc larger than we | |
439 | * need, but we know it will fit in this. | |
440 | */ | |
441 | fnbuffer = malloc( strlen(p) + 1 + strlen(filename) ); | |
442 | if (fnbuffer == NULL) { | |
443 | errno = ENOMEM; | |
444 | return -1; | |
445 | } | |
446 | ||
447 | /* | |
448 | * try each component of the path to see if the file's there | |
449 | * and executable. | |
450 | */ | |
451 | for (path = p ; path ; path = p) { | |
452 | /* construct full path name to try */ | |
453 | if ((p = index(path,':')) == NULL) { | |
454 | strcpy(fnbuffer, path); | |
455 | } else { | |
456 | strncpy(fnbuffer, path, p-path); | |
457 | fnbuffer[p-path] = '\0'; | |
458 | p++; /* Skip : for next time */ | |
459 | } | |
460 | if (strlen(fnbuffer) != 0) | |
461 | strcat(fnbuffer,"/"); | |
462 | strcat(fnbuffer,filename); | |
463 | ||
464 | /* check to see if file is there and is a normal file */ | |
465 | if (stat(fnbuffer, &statbuf) < 0) { | |
466 | if (errno == ENOENT) | |
467 | continue; /* file not there,keep on looking */ | |
468 | else | |
469 | goto fail; /* failed for some reason, return */ | |
470 | } | |
471 | if ( (statbuf.st_mode & S_IFMT) != S_IFREG) continue; | |
472 | ||
473 | if (execve(fnbuffer, argstart, environ) < 0 | |
474 | && errno != ENOENT | |
475 | && errno != ENOEXEC) { | |
476 | /* failed, for some other reason besides "file | |
477 | * not found" or "not a.out format" | |
478 | */ | |
479 | goto fail; | |
480 | } | |
481 | ||
482 | /* | |
483 | * If we got error ENOEXEC, the file is executable but is | |
484 | * not an object file. Try to execute it as a shell script, | |
485 | * returning error if we can't execute /bin/sh. | |
486 | * | |
487 | * FIXME, this code is broken in several ways. Shell | |
488 | * scripts should not in general be executed by the user's | |
489 | * SHELL variable program. On more mature systems, the | |
490 | * script can specify with #!/bin/whatever. Also, this | |
491 | * code clobbers argstart[-1] if the exec of the shell | |
492 | * fails. | |
493 | */ | |
494 | if (errno == ENOEXEC) { | |
495 | char *shell; | |
496 | ||
497 | /* Try to execute command "sh arg0 arg1 ..." */ | |
498 | if ((shell = getenv("SHELL")) == NULL) | |
499 | shell = "/bin/sh"; | |
500 | argstart[-1] = shell; | |
501 | argstart[0] = fnbuffer; | |
502 | execve(shell, &argstart[-1], environ); | |
503 | goto fail; /* Exec didn't work */ | |
504 | } | |
505 | ||
506 | /* | |
507 | * If we succeeded, the execve() doesn't return, so we | |
508 | * can only be here is if the file hasn't been found yet. | |
509 | * Try the next place on the path. | |
510 | */ | |
511 | } | |
512 | ||
513 | /* all attempts failed to locate the file. Give up. */ | |
514 | errno = ENOENT; | |
515 | ||
516 | fail: | |
517 | free(fnbuffer); | |
518 | return -1; | |
519 | } | |
520 | #endif | |
521 | ||
522 | ||
523 | #ifdef EMUL_OPEN3 | |
524 | #include "open3.h" | |
525 | /* | |
526 | * open3 -- routine to emulate the 3-argument open system | |
527 | * call that is present in most modern Unix systems. | |
528 | * This version attempts to support all the flag bits except for O_NDELAY | |
529 | * and O_APPEND, which are silently ignored. The emulation is not as efficient | |
530 | * as the real thing (at worst, 4 system calls instead of one), but there's | |
531 | * not much I can do about that. | |
532 | * | |
533 | * Written 6/10/87 by rmtodd@uokmax | |
534 | * | |
535 | * open3(path, flag, mode) | |
536 | * Attempts to open the file specified by | |
537 | * the given pathname. The following flag bits (#defined in tar.h) | |
538 | * specify options to the routine: | |
539 | * O_RDONLY file open for read only | |
540 | * O_WRONLY file open for write only | |
541 | * O_RDWR file open for both read & write | |
542 | * (Needless to say, you should only specify one of the above). | |
543 | * O_CREAT file is created with specified mode if it needs to be. | |
544 | * O_TRUNC if file exists, it is truncated to 0 bytes | |
545 | * O_EXCL used with O_CREAT--routine returns error if file exists | |
546 | * Function returns file descriptor if successful, -1 and errno if not. | |
547 | */ | |
548 | ||
549 | /* | |
550 | * array to give arguments to access for various modes | |
551 | * FIXME, this table depends on the specific integer values of O_XXX, | |
552 | * and also contains integers (args to 'access') that should be #define's. | |
553 | */ | |
554 | static int modes[] = | |
555 | { | |
556 | 04, /* O_RDONLY */ | |
557 | 02, /* O_WRONLY */ | |
558 | 06, /* O_RDWR */ | |
559 | 06, /* invalid but we'd better cope -- O_WRONLY+O_RDWR */ | |
560 | }; | |
561 | ||
562 | /* Shut off the automatic emulation of open(), we'll need it. */ | |
563 | #undef open | |
564 | ||
565 | int | |
566 | open3(path, flags, mode) | |
567 | char *path; | |
568 | int flags, mode; | |
569 | { | |
570 | extern int errno; | |
571 | int exists = 1; | |
572 | int call_creat = 0; | |
573 | int fd; | |
574 | /* | |
575 | * We actually do the work by calling the open() or creat() system | |
576 | * call, depending on the flags. Call_creat is true if we will use | |
577 | * creat(), false if we will use open(). | |
578 | */ | |
579 | ||
580 | /* | |
581 | * See if the file exists and is accessible in the requested mode. | |
582 | * | |
583 | * Strictly speaking we shouldn't be using access, since access checks | |
584 | * against real uid, and the open call should check against euid. | |
585 | * Most cases real uid == euid, so it won't matter. FIXME. | |
586 | * FIXME, the construction "flags & 3" and the modes table depends | |
587 | * on the specific integer values of the O_XXX #define's. Foo! | |
588 | */ | |
589 | if (access(path,modes[flags & 3]) < 0) { | |
590 | if (errno == ENOENT) { | |
591 | /* the file does not exist */ | |
592 | exists = 0; | |
593 | } else { | |
594 | /* probably permission violation */ | |
595 | if (flags & O_EXCL) { | |
596 | /* Oops, the file exists, we didn't want it. */ | |
597 | /* No matter what the error, claim EEXIST. */ | |
598 | errno = EEXIST; | |
599 | } | |
600 | return -1; | |
601 | } | |
602 | } | |
603 | ||
604 | /* if we have the O_CREAT bit set, check for O_EXCL */ | |
605 | if (flags & O_CREAT) { | |
606 | if ((flags & O_EXCL) && exists) { | |
607 | /* Oops, the file exists and we didn't want it to. */ | |
608 | errno = EEXIST; | |
609 | return -1; | |
610 | } | |
611 | /* | |
612 | * If the file doesn't exist, be sure to call creat() so that | |
613 | * it will be created with the proper mode. | |
614 | */ | |
615 | if (!exists) call_creat = 1; | |
616 | } else { | |
617 | /* If O_CREAT isn't set and the file doesn't exist, error. */ | |
618 | if (!exists) { | |
619 | errno = ENOENT; | |
620 | return -1; | |
621 | } | |
622 | } | |
623 | ||
624 | /* | |
625 | * If the O_TRUNC flag is set and the file exists, we want to call | |
626 | * creat() anyway, since creat() guarantees that the file will be | |
627 | * truncated and open()-for-writing doesn't. | |
628 | * (If the file doesn't exist, we're calling creat() anyway and the | |
629 | * file will be created with zero length.) | |
630 | */ | |
631 | if ((flags & O_TRUNC) && exists) call_creat = 1; | |
632 | /* actually do the call */ | |
633 | if (call_creat) { | |
634 | /* | |
635 | * call creat. May have to close and reopen the file if we | |
636 | * want O_RDONLY or O_RDWR access -- creat() only gives | |
637 | * O_WRONLY. | |
638 | */ | |
639 | fd = creat(path,mode); | |
640 | if (fd < 0 || (flags & O_WRONLY)) return fd; | |
641 | if (close(fd) < 0) return -1; | |
642 | /* Fall out to reopen the file we've created */ | |
643 | } | |
644 | ||
645 | /* | |
646 | * calling old open, we strip most of the new flags just in case. | |
647 | */ | |
648 | return open(path, flags & (O_RDONLY|O_WRONLY|O_RDWR|O_BINARY)); | |
649 | } | |
650 | #endif | |
651 | ||
652 | #ifdef WANT_MKNOD | |
653 | #ifdef __MSDOS__ | |
654 | typedef int dev_t; | |
655 | #endif | |
656 | /* Fake mknod by complaining */ | |
657 | int | |
658 | mknod(path, mode, dev) | |
659 | char *path; | |
660 | unsigned short mode; | |
661 | dev_t dev; | |
662 | { | |
663 | extern int errno; | |
664 | int fd; | |
665 | ||
666 | errno = ENXIO; /* No such device or address */ | |
667 | return -1; /* Just give an error */ | |
668 | } | |
669 | ||
670 | /* Fake links by copying */ | |
671 | int | |
672 | link(path1, path2) | |
673 | char *path1; | |
674 | char *path2; | |
675 | { | |
676 | char buf[256]; | |
677 | int ifd, ofd; | |
678 | int nrbytes; | |
679 | int nwbytes; | |
680 | ||
681 | fprintf(stderr, "%s: %s: cannot link to %s, copying instead\n", | |
682 | tar, path1, path2); | |
683 | if ((ifd = open(path1, O_RDONLY|O_BINARY)) < 0) | |
684 | return -1; | |
685 | if ((ofd = creat(path2, 0666)) < 0) | |
686 | return -1; | |
687 | setmode(ofd, O_BINARY); | |
688 | while ((nrbytes = read(ifd, buf, sizeof(buf))) > 0) { | |
689 | if ((nwbytes = write(ofd, buf, nrbytes)) != nrbytes) { | |
690 | nrbytes = -1; | |
691 | break; | |
692 | } | |
693 | } | |
694 | /* Note use of "|" rather than "||" below: we want to close | |
695 | * the files even if an error occurs. | |
696 | */ | |
697 | if ((nrbytes < 0) | (0 != close(ifd)) | (0 != close(ofd))) { | |
698 | unlink(path2); | |
699 | return -1; | |
700 | } | |
701 | return 0; | |
702 | } | |
703 | ||
704 | /* everyone owns everything on MS-DOS (or is it no one owns anything?) */ | |
705 | int | |
706 | chown(path, uid, gid) | |
707 | char *path; | |
708 | int uid; | |
709 | int gid; | |
710 | { | |
711 | return 0; | |
712 | } | |
713 | ||
714 | int | |
715 | geteuid() | |
716 | { | |
717 | return 0; | |
718 | } | |
719 | #endif /* WANT_MKNOD */ | |
720 | ||
721 | #ifdef WANT_UTILS | |
722 | /* Stash argv[0] here so panic will know what the program is called */ | |
723 | char *myname = 0; | |
724 | ||
725 | void | |
726 | panic(s) | |
727 | char *s; | |
728 | { | |
729 | if(myname) | |
730 | fprintf(stderr,"%s:",myname); | |
731 | fprintf(stderr,s); | |
732 | putc('\n',stderr); | |
733 | exit(12); | |
734 | } | |
735 | ||
736 | ||
737 | char * | |
738 | ck_malloc(size) | |
739 | size_t size; | |
740 | { | |
741 | char *ret; | |
742 | char *malloc(); | |
743 | ||
744 | if(!size) | |
745 | size++; | |
746 | ret=malloc(size); | |
747 | if(ret==0) | |
748 | panic("Couldn't allocate memory"); | |
749 | return ret; | |
750 | } | |
751 | ||
752 | char * | |
753 | ck_realloc(ptr,size) | |
754 | char *ptr; | |
755 | size_t size; | |
756 | { | |
757 | char *ret; | |
758 | char *realloc(); | |
759 | ||
760 | if(!ptr) | |
761 | ret=ck_malloc(size); | |
762 | else | |
763 | ret=realloc(ptr,size); | |
764 | if(ret==0) | |
765 | panic("Couldn't re-allocate memory"); | |
766 | return ret; | |
767 | } | |
768 | ||
769 | /* Implement a variable sized buffer of 'stuff'. We don't know what it is, | |
770 | nor do we care, as long as it doesn't mind being aligned on a char boundry. | |
771 | */ | |
772 | ||
773 | struct buffer { | |
774 | int allocated; | |
775 | int length; | |
776 | char *b; | |
777 | }; | |
778 | ||
779 | #define MIN_ALLOCATE 50 | |
780 | ||
781 | char * | |
782 | init_buffer() | |
783 | { | |
784 | struct buffer *b; | |
785 | ||
786 | b=(struct buffer *)ck_malloc(sizeof(struct buffer)); | |
787 | b->allocated=MIN_ALLOCATE; | |
788 | b->b=(char *)ck_malloc(MIN_ALLOCATE); | |
789 | b->length=0; | |
790 | return (char *)b; | |
791 | } | |
792 | ||
793 | void | |
794 | flush_buffer(bb) | |
795 | char *bb; | |
796 | { | |
797 | struct buffer *b; | |
798 | ||
799 | b=(struct buffer *)bb; | |
800 | free(b->b); | |
801 | b->b=0; | |
802 | b->allocated=0; | |
803 | b->length=0; | |
804 | free((void *)b); | |
805 | } | |
806 | ||
807 | void | |
808 | add_buffer(bb,p,n) | |
809 | char *bb; | |
810 | char *p; | |
811 | int n; | |
812 | { | |
813 | struct buffer *b; | |
814 | ||
815 | b=(struct buffer *)bb; | |
816 | if(b->length+n>b->allocated) { | |
817 | b->allocated=b->length+n+MIN_ALLOCATE; | |
818 | b->b=(char *)ck_realloc(b->b,b->allocated); | |
819 | } | |
820 | bcopy(p,b->b+b->length,n); | |
821 | b->length+=n; | |
822 | } | |
823 | ||
824 | char * | |
825 | get_buffer(bb) | |
826 | char *bb; | |
827 | { | |
828 | struct buffer *b; | |
829 | ||
830 | b=(struct buffer *)bb; | |
831 | return b->b; | |
832 | } | |
833 | ||
834 | char * | |
835 | merge_sort(list,n,off,cmp) | |
836 | char *list; | |
837 | int (*cmp)(); | |
838 | unsigned n; | |
839 | int off; | |
840 | { | |
841 | char *ret; | |
842 | ||
843 | char *alist,*blist; | |
844 | unsigned alength,blength; | |
845 | ||
846 | char *tptr; | |
847 | int tmp; | |
848 | char **prev; | |
849 | #define NEXTOF(ptr) (* ((char **)(((char *)(ptr))+off) ) ) | |
850 | if(n==1) | |
851 | return list; | |
852 | if(n==2) { | |
853 | if((*cmp)(list,NEXTOF(list))>0) { | |
854 | ret=NEXTOF(list); | |
855 | NEXTOF(ret)=list; | |
856 | NEXTOF(list)=0; | |
857 | return ret; | |
858 | } | |
859 | return list; | |
860 | } | |
861 | alist=list; | |
862 | alength=(n+1)/2; | |
863 | blength=n/2; | |
864 | for(tptr=list,tmp=(n-1)/2;tmp;tptr=NEXTOF(tptr),tmp--) | |
865 | ; | |
866 | blist=NEXTOF(tptr); | |
867 | NEXTOF(tptr)=0; | |
868 | ||
869 | alist=merge_sort(alist,alength,off,cmp); | |
870 | blist=merge_sort(blist,blength,off,cmp); | |
871 | prev = &ret; | |
872 | for(;alist && blist;) { | |
873 | if((*cmp)(alist,blist)<0) { | |
874 | tptr=NEXTOF(alist); | |
875 | *prev = alist; | |
876 | prev = &(NEXTOF(alist)); | |
877 | alist=tptr; | |
878 | } else { | |
879 | tptr=NEXTOF(blist); | |
880 | *prev = blist; | |
881 | prev = &(NEXTOF(blist)); | |
882 | blist=tptr; | |
883 | } | |
884 | } | |
885 | if(alist) | |
886 | *prev = alist; | |
887 | else | |
888 | *prev = blist; | |
889 | ||
890 | return ret; | |
891 | } | |
892 | ||
893 | void | |
894 | ck_close(fd) | |
895 | int fd; | |
896 | { | |
897 | if(close(fd)<0) { | |
898 | msg_perror("can't close a file #%d",fd); | |
899 | exit(EX_SYSTEM); | |
900 | } | |
901 | } | |
902 | ||
903 | #include <ctype.h> | |
904 | ||
905 | /* Quote_copy_string is like quote_string, but instead of modifying the | |
906 | string in place, it malloc-s a copy of the string, and returns that. | |
907 | If the string does not have to be quoted, it returns the NULL string. | |
908 | The allocated copy can, of course, be freed with free() after the | |
909 | caller is done with it. | |
910 | */ | |
911 | char * | |
912 | quote_copy_string(string) | |
913 | char *string; | |
914 | { | |
915 | char *from_here; | |
916 | char *to_there = 0; | |
917 | char *copy_buf = 0; | |
918 | int c; | |
919 | int copying = 0; | |
920 | ||
921 | from_here=string; | |
922 | while(*from_here) { | |
923 | c= *from_here++; | |
924 | if(c=='\\') { | |
925 | if(!copying) { | |
926 | int n; | |
927 | ||
928 | n=(from_here-string)-1; | |
929 | copying++; | |
930 | copy_buf=(char *)malloc(n+5+strlen(from_here)*4); | |
931 | if(!copy_buf) | |
932 | return 0; | |
933 | bcopy(string,copy_buf,n); | |
934 | to_there=copy_buf+n; | |
935 | } | |
936 | *to_there++='\\'; | |
937 | *to_there++='\\'; | |
938 | } else if(isprint(c)) { | |
939 | if(copying) | |
940 | *to_there++= c; | |
941 | } else { | |
942 | if(!copying) { | |
943 | int n; | |
944 | ||
945 | n=(from_here-string)-1; | |
946 | copying++; | |
947 | copy_buf=(char *)malloc(n+5+strlen(from_here)*4); | |
948 | if(!copy_buf) | |
949 | return 0; | |
950 | bcopy(string,copy_buf,n); | |
951 | to_there=copy_buf+n; | |
952 | } | |
953 | *to_there++='\\'; | |
954 | if(c=='\n') *to_there++='n'; | |
955 | else if(c=='\t') *to_there++='t'; | |
956 | else if(c=='\f') *to_there++='f'; | |
957 | else if(c=='\b') *to_there++='b'; | |
958 | else if(c=='\r') *to_there++='r'; | |
959 | else if(c=='\177') *to_there++='?'; | |
960 | else { | |
961 | to_there[0]=(c>>6)+'0'; | |
962 | to_there[1]=((c>>3)&07)+'0'; | |
963 | to_there[2]=(c&07)+'0'; | |
964 | to_there+=3; | |
965 | } | |
966 | } | |
967 | } | |
968 | if(copying) { | |
969 | *to_there='\0'; | |
970 | return copy_buf; | |
971 | } | |
972 | return (char *)0; | |
973 | } | |
974 | ||
975 | ||
976 | /* Un_quote_string takes a quoted c-string (like those produced by | |
977 | quote_string or quote_copy_string and turns it back into the | |
978 | un-quoted original. This is done in place. | |
979 | */ | |
980 | ||
981 | /* There is no un-quote-copy-string. Write it yourself */ | |
982 | ||
983 | char *un_quote_string(string) | |
984 | char *string; | |
985 | { | |
986 | char *ret; | |
987 | char *from_here; | |
988 | char *to_there; | |
989 | int tmp; | |
990 | ||
991 | ret=string; | |
992 | to_there=string; | |
993 | from_here=string; | |
994 | while(*from_here) { | |
995 | if(*from_here!='\\') { | |
996 | if(from_here!=to_there) | |
997 | *to_there++= *from_here++; | |
998 | else | |
999 | from_here++,to_there++; | |
1000 | continue; | |
1001 | } | |
1002 | switch(*++from_here) { | |
1003 | case '\\': | |
1004 | *to_there++= *from_here++; | |
1005 | break; | |
1006 | case 'n': | |
1007 | *to_there++= '\n'; | |
1008 | from_here++; | |
1009 | break; | |
1010 | case 't': | |
1011 | *to_there++= '\t'; | |
1012 | from_here++; | |
1013 | break; | |
1014 | case 'f': | |
1015 | *to_there++= '\f'; | |
1016 | from_here++; | |
1017 | break; | |
1018 | case 'b': | |
1019 | *to_there++= '\b'; | |
1020 | from_here++; | |
1021 | break; | |
1022 | case 'r': | |
1023 | *to_there++= '\r'; | |
1024 | from_here++; | |
1025 | break; | |
1026 | case '?': | |
1027 | *to_there++= 0177; | |
1028 | from_here++; | |
1029 | break; | |
1030 | case '0': | |
1031 | case '1': | |
1032 | case '2': | |
1033 | case '3': | |
1034 | case '4': | |
1035 | case '5': | |
1036 | case '6': | |
1037 | case '7': | |
1038 | tmp= *from_here - '0'; | |
1039 | from_here++; | |
1040 | if(*from_here<'0' || *from_here>'7') { | |
1041 | *to_there++= tmp; | |
1042 | break; | |
1043 | } | |
1044 | tmp= tmp*8 + *from_here-'0'; | |
1045 | from_here++; | |
1046 | if(*from_here<'0' || *from_here>'7') { | |
1047 | *to_there++= tmp; | |
1048 | break; | |
1049 | } | |
1050 | tmp=tmp*8 + *from_here-'0'; | |
1051 | from_here++; | |
1052 | *to_there=tmp; | |
1053 | break; | |
1054 | default: | |
1055 | ret=0; | |
1056 | *to_there++='\\'; | |
1057 | *to_there++= *from_here++; | |
1058 | break; | |
1059 | } | |
1060 | } | |
1061 | if(*to_there) | |
1062 | *to_there++='\0'; | |
1063 | return ret; | |
1064 | } | |
1065 | #endif | |
1066 | ||
1067 | #ifdef WANT_CK_PIPE | |
1068 | void ck_pipe(pipes) | |
1069 | int *pipes; | |
1070 | { | |
1071 | if(pipe(pipes)<0) { | |
1072 | msg_perror("can't open a pipe"); | |
1073 | exit(EX_SYSTEM); | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | #endif | |
1078 | ||
1079 | #ifdef WANT_GETWD | |
1080 | char * | |
1081 | getwd(path) | |
1082 | char *path; | |
1083 | { | |
1084 | FILE *fp; | |
1085 | FILE *popen(); | |
1086 | ||
1087 | fp=popen("pwd","r"); | |
1088 | if(!fp) | |
1089 | return 0; | |
1090 | if(!fgets(path,100,fp)) | |
1091 | return 0; | |
1092 | if(!pclose(fp)) | |
1093 | return 0; | |
1094 | return path; | |
1095 | } | |
1096 | #endif /* WANT_CK_PIPE */ | |
1097 | ||
1098 | ||
1099 | #ifdef WANT_STRSTR | |
1100 | ||
1101 | /* | |
1102 | * strstr - find first occurrence of wanted in s | |
1103 | */ | |
1104 | ||
1105 | char * /* found string, or NULL if none */ | |
1106 | strstr(s, wanted) | |
1107 | char *s; | |
1108 | char *wanted; | |
1109 | { | |
1110 | register char *scan; | |
1111 | register size_t len; | |
1112 | register char firstc; | |
1113 | extern int strcmp(); | |
1114 | ||
1115 | if (*wanted == '\0') | |
1116 | return (char *)0; | |
1117 | /* | |
1118 | * The odd placement of the two tests is so "" is findable. | |
1119 | * Also, we inline the first char for speed. | |
1120 | * The ++ on scan has been moved down for optimization. | |
1121 | */ | |
1122 | firstc = *wanted; | |
1123 | len = strlen(wanted); | |
1124 | for (scan = s; *scan != firstc || strncmp(scan, wanted, len) != 0; ) | |
1125 | if (*scan++ == '\0') | |
1126 | return (char *)0; | |
1127 | return scan; | |
1128 | } | |
1129 | #endif | |
1130 | ||
1131 | #ifdef WANT_FTRUNCATE | |
1132 | ||
1133 | #ifdef F_FREESP | |
1134 | /* code courtesy of William Kucharski */ | |
1135 | ||
1136 | int | |
1137 | ftruncate(fd, length) | |
1138 | int fd; /* file descriptor */ | |
1139 | off_t length; /* length to set file to */ | |
1140 | { | |
1141 | struct flock fl; | |
1142 | ||
1143 | fl.l_whence = 0; | |
1144 | fl.l_len = 0; | |
1145 | fl.l_start = length; | |
1146 | fl.l_type = F_WRLCK; /* write lock on file space */ | |
1147 | ||
1148 | /* | |
1149 | * This relies on the UNDOCUMENTED F_FREESP argument to | |
1150 | * fcntl(2), which truncates the file so that it ends at the | |
1151 | * position indicated by fl.l_start. | |
1152 | * | |
1153 | * Will minor miracles never cease? | |
1154 | */ | |
1155 | ||
1156 | if (fcntl(fd, F_FREESP, &fl) < 0) | |
1157 | return -1; | |
1158 | ||
1159 | return 0; | |
1160 | } | |
1161 | ||
1162 | ||
1163 | #else | |
1164 | int | |
1165 | ftruncate(fd, length) | |
1166 | int fd; | |
1167 | off_t length; | |
1168 | { | |
1169 | errno = EIO; | |
1170 | return -1; | |
1171 | } | |
1172 | #endif | |
1173 | ||
1174 | #endif | |
1175 | ||
1176 | ||
1177 | ||
1178 | ||
1179 | extern FILE *msg_file; | |
1180 | ||
1181 | #ifdef STDC_MSG | |
1182 | #include <stdarg.h> | |
1183 | ||
1184 | void | |
1185 | msg(char *str,...) | |
1186 | { | |
1187 | va_list args; | |
1188 | ||
1189 | va_start(args,str); | |
1190 | fflush(msg_file); | |
1191 | fprintf(stderr,"%s: ",tar); | |
1192 | if(f_sayblock) | |
1193 | fprintf(stderr,"rec %d: ",baserec + (ar_record - ar_block)); | |
1194 | vfprintf(stderr,str,args); | |
1195 | va_end(args); | |
1196 | putc('\n',stderr); | |
1197 | fflush(stderr); | |
1198 | } | |
1199 | ||
1200 | void | |
1201 | msg_perror(char *str,...) | |
1202 | { | |
1203 | va_list args; | |
1204 | int save_e; | |
1205 | extern int errno; | |
1206 | ||
1207 | save_e=errno; | |
1208 | fflush(msg_file); | |
1209 | fprintf(stderr,"%s: ",tar); | |
1210 | if(f_sayblock) | |
1211 | fprintf(stderr,"rec %d: ",baserec + (ar_record - ar_block)); | |
1212 | va_start(args,str); | |
1213 | vfprintf(stderr,str,args); | |
1214 | va_end(args); | |
1215 | errno=save_e; | |
1216 | perror(" "); | |
1217 | fflush(stderr); | |
1218 | } | |
1219 | #endif | |
1220 | ||
1221 | #ifdef VARARGS_MSG | |
1222 | #include <varargs.h> | |
1223 | void msg(str,va_alist) | |
1224 | char *str; | |
1225 | va_dcl | |
1226 | { | |
1227 | va_list args; | |
1228 | ||
1229 | fflush(msg_file); | |
1230 | fprintf(stderr,"%s: ",tar); | |
1231 | if(f_sayblock) | |
1232 | fprintf(stderr,"rec %d: ",baserec + (ar_record - ar_block)); | |
1233 | va_start(args); | |
1234 | vfprintf(stderr,str,args); | |
1235 | va_end(args); | |
1236 | putc('\n',stderr); | |
1237 | fflush(stderr); | |
1238 | } | |
1239 | ||
1240 | void msg_perror(str,va_alist) | |
1241 | char *str; | |
1242 | va_dcl | |
1243 | { | |
1244 | va_list args; | |
1245 | int save_e; | |
1246 | extern int errno; | |
1247 | ||
1248 | save_e=errno; | |
1249 | fflush(msg_file); | |
1250 | fprintf(stderr,"%s: ",tar); | |
1251 | if(f_sayblock) | |
1252 | fprintf(stderr,"rec %d: ",baserec + (ar_record - ar_block)); | |
1253 | va_start(args); | |
1254 | vfprintf(stderr,str,args); | |
1255 | va_end(args); | |
1256 | errno=save_e; | |
1257 | perror(" "); | |
1258 | fflush(stderr); | |
1259 | } | |
1260 | #endif | |
1261 | ||
1262 | #ifdef DOPRNT_MSG | |
1263 | void msg(str,args) | |
1264 | char *str; | |
1265 | int args; | |
1266 | { | |
1267 | fflush(msg_file); | |
1268 | fprintf(stderr,"%s: ",tar); | |
1269 | if(f_sayblock) | |
1270 | fprintf(stderr,"rec %d: ",baserec + (ar_record - ar_block)); | |
1271 | _doprnt(str, &args, stderr); | |
1272 | putc('\n',stderr); | |
1273 | fflush(stderr); | |
1274 | } | |
1275 | ||
1276 | void msg_perror(str,args) | |
1277 | char *str; | |
1278 | { | |
1279 | int save_e; | |
1280 | extern int errno; | |
1281 | ||
1282 | save_e=errno; | |
1283 | fflush(msg_file); | |
1284 | fprintf(stderr,"%s: ",tar); | |
1285 | if(f_sayblock) | |
1286 | fprintf(stderr,"rec %d: ",baserec + (ar_record - ar_block)); | |
1287 | _doprnt(str, &args, stderr); | |
1288 | errno=save_e; | |
1289 | perror(" "); | |
1290 | fflush(stderr); | |
1291 | } | |
1292 | ||
1293 | #endif | |
1294 | #ifdef LOSING_MSG | |
1295 | void msg(str,a1,a2,a3,a4,a5,a6) | |
1296 | char *str; | |
1297 | { | |
1298 | fflush(msg_file); | |
1299 | fprintf(stderr,"%s: ",tar); | |
1300 | if(f_sayblock) | |
1301 | fprintf(stderr,"rec %d: ",baserec + (ar_record - ar_block)); | |
1302 | fprintf(stderr,str,a1,a2,a3,a4,a5,a6); | |
1303 | putc('\n',stderr); | |
1304 | fflush(stderr); | |
1305 | } | |
1306 | ||
1307 | void msg_perror(str,a1,a2,a3,a4,a5,a6) | |
1308 | char *str; | |
1309 | { | |
1310 | int save_e; | |
1311 | extern int errno; | |
1312 | ||
1313 | save_e=errno; | |
1314 | fflush(msg_file); | |
1315 | fprintf(stderr,"%s: ",tar); | |
1316 | if(f_sayblock) | |
1317 | fprintf(stderr,"rec %d: ",baserec + (ar_record - ar_block)); | |
1318 | fprintf(stderr,str,a1,a2,a3,a4,a5,a6); | |
1319 | fprintf(stderr,": "); | |
1320 | errno=save_e; | |
1321 | perror(" "); | |
1322 | } | |
1323 | ||
1324 | #endif |