util.c revision 1.15
1 /* $NetBSD: util.c,v 1.15 2003/05/30 18:14:13 kristerw Exp $ */ 2 #include <sys/cdefs.h> 3 #ifndef lint 4 __RCSID("$NetBSD: util.c,v 1.15 2003/05/30 18:14:13 kristerw Exp $"); 5 #endif /* not lint */ 6 7 #include <sys/param.h> 8 9 #include "EXTERN.h" 10 #include "common.h" 11 #include "INTERN.h" 12 #include "util.h" 13 #include "backupfile.h" 14 15 #include <stdarg.h> 16 #include <stdlib.h> 17 #include <unistd.h> 18 #include <fcntl.h> 19 20 /* 21 * Rename a file, copying it if necessary. 22 */ 23 int 24 move_file(char *from, char *to) 25 { 26 char bakname[MAXPATHLEN]; 27 char *s; 28 size_t i; 29 int fromfd; 30 31 /* to stdout? */ 32 33 if (strEQ(to, "-")) { 34 #ifdef DEBUGGING 35 if (debug & 4) 36 say("Moving %s to stdout.\n", from); 37 #endif 38 fromfd = open(from, 0); 39 if (fromfd < 0) 40 pfatal("internal error, can't reopen %s", from); 41 while ((i = read(fromfd, buf, sizeof buf)) > 0) 42 if (write(1, buf, i) != 1) 43 pfatal("write failed"); 44 Close(fromfd); 45 return 0; 46 } 47 48 if (origprae) { 49 Strcpy(bakname, origprae); 50 Strcat(bakname, to); 51 } else { 52 #ifndef NODIR 53 char *backupname = find_backup_file_name(to); 54 Strcpy(bakname, backupname); 55 free(backupname); 56 #else /* NODIR */ 57 Strcpy(bakname, to); 58 Strcat(bakname, simple_backup_suffix); 59 #endif /* NODIR */ 60 } 61 62 if (stat(to, &filestat) == 0) { /* output file exists */ 63 dev_t to_device = filestat.st_dev; 64 ino_t to_inode = filestat.st_ino; 65 char *simplename = bakname; 66 67 for (s = bakname; *s; s++) { 68 if (*s == '/') 69 simplename = s + 1; 70 } 71 /* 72 * Find a backup name that is not the same file. 73 * Change the first lowercase char into uppercase; 74 * if that isn't sufficient, chop off the first char 75 * and try again. 76 */ 77 while (stat(bakname, &filestat) == 0 && 78 to_device == filestat.st_dev && 79 to_inode == filestat.st_ino) { 80 /* Skip initial non-lowercase chars. */ 81 for (s = simplename; 82 *s && !islower((unsigned char)*s); 83 s++) 84 ; 85 if (*s) 86 *s = toupper(*s); 87 else 88 Strcpy(simplename, simplename + 1); 89 } 90 while (unlink(bakname) >= 0) 91 ; /* while() is for benefit of Eunice */ 92 #ifdef DEBUGGING 93 if (debug & 4) 94 say("Moving %s to %s.\n", to, bakname); 95 #endif 96 if (link(to, bakname) < 0) { 97 /* 98 * Maybe `to' is a symlink into a different file 99 * system. Copying replaces the symlink with a file; 100 * using rename would be better. 101 */ 102 int tofd; 103 int bakfd; 104 105 bakfd = creat(bakname, 0666); 106 if (bakfd < 0) { 107 say("Can't backup %s, output is in %s: %s\n", 108 to, from, strerror(errno)); 109 return -1; 110 } 111 tofd = open(to, 0); 112 if (tofd < 0) 113 pfatal("internal error, can't open %s", to); 114 while ((i = read(tofd, buf, sizeof buf)) > 0) 115 if (write(bakfd, buf, i) != i) 116 pfatal("write failed"); 117 Close(tofd); 118 Close(bakfd); 119 } 120 while (unlink(to) >= 0) ; 121 } 122 #ifdef DEBUGGING 123 if (debug & 4) 124 say("Moving %s to %s.\n", from, to); 125 #endif 126 if (link(from, to) < 0) { /* different file system? */ 127 int tofd; 128 129 tofd = creat(to, 0666); 130 if (tofd < 0) { 131 say("Can't create %s, output is in %s: %s\n", 132 to, from, strerror(errno)); 133 return -1; 134 } 135 fromfd = open(from, 0); 136 if (fromfd < 0) 137 pfatal("internal error, can't reopen %s", from); 138 while ((i = read(fromfd, buf, sizeof buf)) > 0) 139 if (write(tofd, buf, i) != i) 140 pfatal("write failed"); 141 Close(fromfd); 142 Close(tofd); 143 } 144 Unlink(from); 145 return 0; 146 } 147 148 /* 149 * Copy a file. 150 */ 151 void 152 copy_file(char *from, char *to) 153 { 154 int tofd; 155 int fromfd; 156 size_t i; 157 158 tofd = creat(to, 0666); 159 if (tofd < 0) 160 pfatal("can't create %s", to); 161 fromfd = open(from, 0); 162 if (fromfd < 0) 163 pfatal("internal error, can't reopen %s", from); 164 while ((i = read(fromfd, buf, sizeof buf)) > 0) 165 if (write(tofd, buf, i) != i) 166 pfatal("write to %s failed", to); 167 Close(fromfd); 168 Close(tofd); 169 } 170 171 /* 172 * malloc with result test. 173 */ 174 void * 175 xmalloc(size_t size) 176 { 177 void *p; 178 179 if ((p = malloc(size)) == NULL) 180 fatal("out of memory\n"); 181 return p; 182 } 183 184 /* 185 * realloc with result test. 186 */ 187 void * 188 xrealloc(void *ptr, size_t size) 189 { 190 void *p; 191 192 if ((p = realloc(ptr, size)) == NULL) 193 fatal("out of memory\n"); 194 return p; 195 } 196 197 /* 198 * strdup with result test. 199 */ 200 char * 201 xstrdup(const char *s) 202 { 203 char *p; 204 205 if ((p = strdup(s)) == NULL) 206 fatal("out of memory\n"); 207 return p; 208 } 209 210 /* 211 * Vanilla terminal output. 212 */ 213 void 214 say(const char *pat, ...) 215 { 216 va_list ap; 217 va_start(ap, pat); 218 219 vfprintf(stderr, pat, ap); 220 va_end(ap); 221 Fflush(stderr); 222 } 223 224 /* 225 * Terminal output, pun intended. 226 */ 227 void /* very void */ 228 fatal(const char *pat, ...) 229 { 230 va_list ap; 231 va_start(ap, pat); 232 233 fprintf(stderr, "patch: **** "); 234 vfprintf(stderr, pat, ap); 235 va_end(ap); 236 my_exit(1); 237 } 238 239 /* 240 * Say something from patch, something from the system, then silence... 241 */ 242 void /* very void */ 243 pfatal(const char *pat, ...) 244 { 245 va_list ap; 246 int errnum = errno; 247 va_start(ap, pat); 248 249 fprintf(stderr, "patch: **** "); 250 vfprintf(stderr, pat, ap); 251 fprintf(stderr, ": %s\n", strerror(errnum)); 252 va_end(ap); 253 my_exit(1); 254 } 255 256 /* 257 * Get a response from the user, somehow or other. 258 */ 259 void 260 ask(const char *pat, ...) 261 { 262 int ttyfd; 263 int r; 264 bool tty2 = isatty(2); 265 va_list ap; 266 va_start(ap, pat); 267 268 (void)vsprintf(buf, pat, ap); 269 va_end(ap); 270 Fflush(stderr); 271 write(2, buf, strlen(buf)); 272 if (tty2) { /* might be redirected to a file */ 273 r = read(2, buf, sizeof buf); 274 } else if (isatty(1)) { /* this may be new file output */ 275 Fflush(stdout); 276 write(1, buf, strlen(buf)); 277 r = read(1, buf, sizeof buf); 278 } else if ((ttyfd = open("/dev/tty", 2)) >= 0 && isatty(ttyfd)) { 279 /* might be deleted or unwritable */ 280 write(ttyfd, buf, strlen(buf)); 281 r = read(ttyfd, buf, sizeof buf); 282 Close(ttyfd); 283 } else if (isatty(0)) { /* this is probably patch input */ 284 Fflush(stdin); 285 write(0, buf, strlen(buf)); 286 r = read(0, buf, sizeof buf); 287 } else { /* no terminal at all--default it */ 288 buf[0] = '\n'; 289 r = 1; 290 } 291 if (r <= 0) 292 buf[0] = 0; 293 else 294 buf[r] = '\0'; 295 if (!tty2) 296 say("%s", buf); 297 } 298 299 /* 300 * How to handle certain events when not in a critical region. 301 */ 302 void 303 set_signals(int reset) 304 { 305 static void (*hupval)(int); 306 static void (*intval)(int); 307 308 if (!reset) { 309 hupval = signal(SIGHUP, SIG_IGN); 310 if (hupval != SIG_IGN) 311 hupval = my_exit; 312 intval = signal(SIGINT, SIG_IGN); 313 if (intval != SIG_IGN) 314 intval = my_exit; 315 } 316 Signal(SIGHUP, hupval); 317 Signal(SIGINT, intval); 318 } 319 320 /* 321 * How to handle certain events when in a critical region. 322 */ 323 void 324 ignore_signals() 325 { 326 Signal(SIGHUP, SIG_IGN); 327 Signal(SIGINT, SIG_IGN); 328 } 329 330 /* 331 * Make sure we'll have the directories to create a file. 332 * If `striplast' is TRUE, ignore the last element of `filename'. 333 */ 334 void 335 makedirs(char *filename, bool striplast) 336 { 337 char tmpbuf[MAXPATHLEN]; 338 char *s = tmpbuf; 339 char *dirv[MAXPATHLEN]; /* Point to the NULs between elements. */ 340 int i; 341 int dirvp = 0; /* Number of finished entries in dirv. */ 342 343 /* 344 * Copy `filename' into `tmpbuf' with a NUL instead of a slash 345 * between the directories. 346 */ 347 while (*filename) { 348 if (*filename == '/') { 349 filename++; 350 dirv[dirvp++] = s; 351 *s++ = '\0'; 352 } else { 353 *s++ = *filename++; 354 } 355 } 356 *s = '\0'; 357 dirv[dirvp] = s; 358 if (striplast) 359 dirvp--; 360 if (dirvp < 0) 361 return; 362 363 strcpy(buf, "mkdir"); 364 s = buf; 365 for (i = 0; i <= dirvp; i++) { 366 struct stat sbuf; 367 368 if (stat(tmpbuf, &sbuf) && errno == ENOENT) { 369 while (*s) 370 s++; 371 *s++ = ' '; 372 strcpy(s, tmpbuf); 373 } 374 *dirv[i] = '/'; 375 } 376 if (s != buf) 377 system(buf); 378 } 379 380 /* 381 * Make filenames more reasonable. 382 */ 383 char * 384 fetchname(char *at, int strip_leading, int assume_exists) 385 { 386 char *fullname; 387 char *name; 388 char *t; 389 char tmpbuf[MAXPATHLEN]; 390 int sleading = strip_leading; 391 392 if (!at) 393 return NULL; 394 while (isspace((unsigned char)*at)) 395 at++; 396 #ifdef DEBUGGING 397 if (debug & 128) 398 say("fetchname %s %d %d\n", at, strip_leading, assume_exists); 399 #endif 400 filename_is_dev_null = FALSE; 401 if (strnEQ(at, "/dev/null", 9)) { 402 /* So files can be created by diffing against /dev/null. */ 403 filename_is_dev_null = TRUE; 404 return NULL; 405 } 406 name = fullname = t = xstrdup(at); 407 408 /* Strip off up to `sleading' leading slashes and null terminate. */ 409 for (; *t && !isspace((unsigned char)*t); t++) 410 if (*t == '/') 411 if (--sleading >= 0) 412 name = t + 1; 413 *t = '\0'; 414 415 /* 416 * If no -p option was given (957 is the default value!), 417 * we were given a relative pathname, 418 * and the leading directories that we just stripped off all exist, 419 * put them back on. 420 */ 421 if (strip_leading == 957 && name != fullname && *fullname != '/') { 422 name[-1] = '\0'; 423 if (stat(fullname, &filestat) == 0 && 424 S_ISDIR(filestat.st_mode)) { 425 name[-1] = '/'; 426 name = fullname; 427 } 428 } 429 430 name = xstrdup(name); 431 free(fullname); 432 433 if (stat(name, &filestat) && !assume_exists) { 434 char *filebase = basename(name); 435 size_t pathlen = filebase - name; 436 437 /* Put any leading path into `tmpbuf'. */ 438 strncpy(tmpbuf, name, pathlen); 439 440 #define try(f, a1, a2) \ 441 (Sprintf(tmpbuf + pathlen, f, a1, a2), stat(tmpbuf, &filestat) == 0) 442 #define try1(f, a1) \ 443 (Sprintf(tmpbuf + pathlen, f, a1), stat(tmpbuf, &filestat) == 0) 444 if (try("RCS/%s%s", filebase, RCSSUFFIX) || 445 try1("RCS/%s" , filebase) || 446 try( "%s%s", filebase, RCSSUFFIX) || 447 try("SCCS/%s%s", SCCSPREFIX, filebase) || 448 try( "%s%s", SCCSPREFIX, filebase)) 449 return name; 450 free(name); 451 name = NULL; 452 } 453 454 return name; 455 } 456
Indexes created Mon Sep 22 13:09:51 GMT 2025