1 /* 2 * $OpenBSD: util.c,v 1.32 2006/03/11 19:41:30 otto Exp $ 3 * $DragonFly: src/usr.bin/patch/util.c,v 1.9 2007/09/29 23:11:10 swildner Exp $ 4 */ 5 6 /* 7 * patch - a program to apply diffs to original files 8 * 9 * Copyright 1986, Larry Wall 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following condition is met: 13 * 1. Redistributions of source code must retain the above copyright notice, 14 * this condition and the following disclaimer. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY 17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 18 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 19 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR 20 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 22 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER 23 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 * 28 * -C option added in 1998, original code by Marc Espie, based on FreeBSD 29 * behaviour 30 */ 31 32 #include <sys/param.h> 33 #include <sys/stat.h> 34 35 #include <ctype.h> 36 #include <errno.h> 37 #include <fcntl.h> 38 #include <libgen.h> 39 #include <paths.h> 40 #include <signal.h> 41 #include <stdarg.h> 42 #include <stdlib.h> 43 #include <stdio.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include "common.h" 48 #include "util.h" 49 #include "backupfile.h" 50 #include "pathnames.h" 51 52 /* Rename a file, copying it if necessary. */ 53 54 int 55 move_file(const char *from, const char *to) 56 { 57 int fromfd; 58 ssize_t i; 59 60 /* to stdout? */ 61 62 if (strEQ(to, "-")) { 63 #ifdef DEBUGGING 64 if (debug & 4) 65 say("Moving %s to stdout.\n", from); 66 #endif 67 fromfd = open(from, O_RDONLY); 68 if (fromfd < 0) 69 pfatal("internal error, can't reopen %s", from); 70 while ((i = read(fromfd, buf, buf_len)) > 0) 71 if (write(STDOUT_FILENO, buf, i) != i) 72 pfatal("write failed"); 73 close(fromfd); 74 return 0; 75 } 76 if (backup_file(to) < 0) { 77 say("Can't backup %s, output is in %s: %s\n", to, from, 78 strerror(errno)); 79 return -1; 80 } 81 #ifdef DEBUGGING 82 if (debug & 4) 83 say("Moving %s to %s.\n", from, to); 84 #endif 85 if (rename(from, to) < 0) { 86 if (errno != EXDEV || copy_file(from, to) < 0) { 87 say("Can't create %s, output is in %s: %s\n", 88 to, from, strerror(errno)); 89 return -1; 90 } 91 } 92 return 0; 93 } 94 95 /* Backup the original file. */ 96 97 int 98 backup_file(const char *orig) 99 { 100 struct stat filestat; 101 char bakname[MAXPATHLEN], *s, *simplename; 102 dev_t orig_device; 103 ino_t orig_inode; 104 105 if (backup_type == none || stat(orig, &filestat) != 0) 106 return 0; /* nothing to do */ 107 /* 108 * If the user used zero prefixes or suffixes, then 109 * he doesn't want backups. Yet we have to remove 110 * orig to break possible hardlinks. 111 */ 112 if ((origprae && *origprae == 0) || *simple_backup_suffix == 0) { 113 unlink(orig); 114 return 0; 115 } 116 orig_device = filestat.st_dev; 117 orig_inode = filestat.st_ino; 118 119 if (origprae) { 120 if (strlcpy(bakname, origprae, sizeof(bakname)) >= sizeof(bakname) || 121 strlcat(bakname, orig, sizeof(bakname)) >= sizeof(bakname)) 122 fatal("filename %s too long for buffer\n", origprae); 123 } else { 124 if ((s = find_backup_file_name(orig)) == NULL) 125 fatal("out of memory\n"); 126 if (strlcpy(bakname, s, sizeof(bakname)) >= sizeof(bakname)) 127 fatal("filename %s too long for buffer\n", s); 128 free(s); 129 } 130 131 if ((simplename = strrchr(bakname, '/')) != NULL) 132 simplename = simplename + 1; 133 else 134 simplename = bakname; 135 136 /* 137 * Find a backup name that is not the same file. Change the 138 * first lowercase char into uppercase; if that isn't 139 * sufficient, chop off the first char and try again. 140 */ 141 while (stat(bakname, &filestat) == 0 && 142 orig_device == filestat.st_dev && orig_inode == filestat.st_ino) { 143 /* Skip initial non-lowercase chars. */ 144 for (s = simplename; *s && !islower((unsigned char)*s); s++) 145 ; 146 if (*s) 147 *s = toupper((unsigned char)*s); 148 else 149 memmove(simplename, simplename + 1, 150 strlen(simplename + 1) + 1); 151 } 152 #ifdef DEBUGGING 153 if (debug & 4) 154 say("Moving %s to %s.\n", orig, bakname); 155 #endif 156 if (rename(orig, bakname) < 0) { 157 if (errno != EXDEV || copy_file(orig, bakname) < 0) 158 return -1; 159 } 160 return 0; 161 } 162 163 /* 164 * Copy a file. 165 */ 166 int 167 copy_file(const char *from, const char *to) 168 { 169 int tofd, fromfd; 170 ssize_t i; 171 172 tofd = open(to, O_CREAT|O_TRUNC|O_WRONLY, 0666); 173 if (tofd < 0) 174 return -1; 175 fromfd = open(from, O_RDONLY, 0); 176 if (fromfd < 0) 177 pfatal("internal error, can't reopen %s", from); 178 while ((i = read(fromfd, buf, buf_len)) > 0) 179 if (write(tofd, buf, i) != i) 180 pfatal("write to %s failed", to); 181 close(fromfd); 182 close(tofd); 183 return 0; 184 } 185 186 /* 187 * Allocate a unique area for a string. 188 */ 189 char * 190 savestr(const char *s) 191 { 192 char *rv; 193 194 if (!s) 195 s = "Oops"; 196 rv = strdup(s); 197 if (rv == NULL) { 198 if (using_plan_a) 199 out_of_mem = true; 200 else 201 fatal("out of memory\n"); 202 } 203 return rv; 204 } 205 206 /* 207 * Vanilla terminal output (buffered). 208 */ 209 void 210 say(const char *fmt, ...) 211 { 212 va_list ap; 213 214 va_start(ap, fmt); 215 vfprintf(stderr, fmt, ap); 216 va_end(ap); 217 fflush(stderr); 218 } 219 220 /* 221 * Terminal output, pun intended. 222 */ 223 void 224 fatal(const char *fmt, ...) 225 { 226 va_list ap; 227 228 va_start(ap, fmt); 229 fprintf(stderr, "patch: **** "); 230 vfprintf(stderr, fmt, ap); 231 va_end(ap); 232 my_exit(2); 233 } 234 235 /* 236 * Say something from patch, something from the system, then silence . . . 237 */ 238 void 239 pfatal(const char *fmt, ...) 240 { 241 va_list ap; 242 int errnum = errno; 243 244 fprintf(stderr, "patch: **** "); 245 va_start(ap, fmt); 246 vfprintf(stderr, fmt, ap); 247 va_end(ap); 248 fprintf(stderr, ": %s\n", strerror(errnum)); 249 my_exit(2); 250 } 251 252 /* 253 * Get a response from the user via /dev/tty 254 */ 255 void 256 ask(const char *fmt, ...) 257 { 258 va_list ap; 259 ssize_t nr = 0; 260 static int ttyfd = -1; 261 262 va_start(ap, fmt); 263 vfprintf(stdout, fmt, ap); 264 va_end(ap); 265 fflush(stdout); 266 if (ttyfd < 0) 267 ttyfd = open(_PATH_TTY, O_RDONLY); 268 if (ttyfd >= 0) { 269 if ((nr = read(ttyfd, buf, buf_len)) > 0 && 270 buf[nr - 1] == '\n') 271 buf[nr - 1] = '\0'; 272 } 273 if (ttyfd < 0 || nr <= 0) { 274 /* no tty or error reading, pretend user entered 'return' */ 275 putchar('\n'); 276 buf[0] = '\0'; 277 } 278 } 279 280 /* 281 * How to handle certain events when not in a critical region. 282 */ 283 void 284 set_signals(int reset) 285 { 286 static sig_t hupval, intval; 287 288 if (!reset) { 289 hupval = signal(SIGHUP, SIG_IGN); 290 if (hupval != SIG_IGN) 291 hupval = my_exit; 292 intval = signal(SIGINT, SIG_IGN); 293 if (intval != SIG_IGN) 294 intval = my_exit; 295 } 296 signal(SIGHUP, hupval); 297 signal(SIGINT, intval); 298 } 299 300 /* 301 * How to handle certain events when in a critical region. 302 */ 303 void 304 ignore_signals(void) 305 { 306 signal(SIGHUP, SIG_IGN); 307 signal(SIGINT, SIG_IGN); 308 } 309 310 /* 311 * Make sure we'll have the directories to create a file. If `striplast' is 312 * true, ignore the last element of `filename'. 313 */ 314 315 void 316 makedirs(const char *filename, bool striplast) 317 { 318 char *tmpbuf; 319 320 if ((tmpbuf = strdup(filename)) == NULL) 321 fatal("out of memory\n"); 322 323 if (striplast) { 324 char *s = strrchr(tmpbuf, '/'); 325 if (s == NULL) { 326 free(tmpbuf); 327 return; /* nothing to be done */ 328 } 329 *s = '\0'; 330 } 331 if (mkpath(tmpbuf) != 0) 332 pfatal("creation of %s failed", tmpbuf); 333 free(tmpbuf); 334 } 335 336 /* 337 * Make filenames more reasonable. 338 */ 339 char * 340 fetchname(const char *at, bool *exists, int strip_leading) 341 { 342 char *fullname, *name, *t; 343 int sleading, tab; 344 struct stat filestat; 345 346 if (at == NULL || *at == '\0') 347 return NULL; 348 while (isspace((unsigned char)*at)) 349 at++; 350 #ifdef DEBUGGING 351 if (debug & 128) 352 say("fetchname %s %d\n", at, strip_leading); 353 #endif 354 /* So files can be created by diffing against /dev/null. */ 355 if (strnEQ(at, _PATH_DEVNULL, sizeof(_PATH_DEVNULL) - 1)) 356 return NULL; 357 name = fullname = t = savestr(at); 358 359 tab = strchr(t, '\t') != NULL; 360 /* Strip off up to `strip_leading' path components and NUL terminate. */ 361 for (sleading = strip_leading; *t != '\0' && ((tab && *t != '\t') || 362 !isspace((unsigned char)*t)); t++) { 363 if (t[0] == '/' && t[1] != '/' && t[1] != '\0') 364 if (--sleading >= 0) 365 name = t + 1; 366 } 367 *t = '\0'; 368 369 /* 370 * If no -p option was given (957 is the default value!), we were 371 * given a relative pathname, and the leading directories that we 372 * just stripped off all exist, put them back on. 373 */ 374 if (strip_leading == 957 && name != fullname && *fullname != '/') { 375 name[-1] = '\0'; 376 if (stat(fullname, &filestat) == 0 && S_ISDIR(filestat.st_mode)) { 377 name[-1] = '/'; 378 name = fullname; 379 } 380 } 381 name = savestr(name); 382 free(fullname); 383 384 *exists = stat(name, &filestat) == 0; 385 return name; 386 } 387 388 /* 389 * Takes the name returned by fetchname and looks in RCS/SCCS directories 390 * for a checked in version. 391 */ 392 char * 393 checked_in(char *file) 394 { 395 char *filebase, *filedir, tmpbuf[MAXPATHLEN]; 396 struct stat filestat; 397 398 filebase = basename(file); 399 filedir = dirname(file); 400 401 #define try(f, a1, a2, a3) \ 402 (snprintf(tmpbuf, sizeof tmpbuf, f, a1, a2, a3), stat(tmpbuf, &filestat) == 0) 403 404 if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) || 405 try("%s/RCS/%s%s", filedir, filebase, "") || 406 try("%s/%s%s", filedir, filebase, RCSSUFFIX) || 407 try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) || 408 try("%s/%s%s", filedir, SCCSPREFIX, filebase)) 409 return file; 410 411 return NULL; 412 } 413 414 void 415 version(void) 416 { 417 fprintf(stderr, "Patch version 2.0-12u8-OpenBSD\n"); 418 my_exit(EXIT_SUCCESS); 419 } 420 421 /* 422 * Exit with cleanup. 423 */ 424 void 425 my_exit(int status) 426 { 427 unlink(TMPINNAME); 428 if (!toutkeep) 429 unlink(TMPOUTNAME); 430 if (!trejkeep) 431 unlink(TMPREJNAME); 432 unlink(TMPPATNAME); 433 exit(status); 434 } 435