WINGs/findfile.c

   1 /*
   2  *  Window Maker miscelaneous function library
   3  *
   4  *  Copyright (c) 1997-2003 Alfredo K. Kojima
   5  *
   6  *  This program 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 2 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  This program 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 this program; if not, write to the Free Software
  18  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20
  21 #include "wconfig.h"
  22
  23 #include "WUtil.h"
  24
  25 #include <sys/stat.h>
  26 #include <errno.h>
  27 #include <stdio.h>
  28 #include <stdlib.h>
  29 #include <unistd.h>
  30 #include <string.h>
  31 #include <pwd.h>
  32 #include <limits.h>
  33
  34 #ifndef PATH_MAX
  35 #define PATH_MAX  1024
  36 #endif
  37
  38 #define RETRY( x ) do { x; } while (errno == EINTR);
  39
  40 char *wgethomedir()
  41 {
  42         static char *home = NULL;
  43         char *tmp;
  44         struct passwd *user;
  45
  46         if (home)
  47                 return home;
  48
  49         tmp = getenv("HOME");
  50         if (tmp) {
  51                 home = wstrdup(tmp);
  52                 return home;
  53         }
  54
  55         user = getpwuid(getuid());
  56         if (!user) {
  57                 werror(_("could not get password entry for UID %i"), getuid());
  58                 home = "/";
  59         }
  60
  61         if (!user->pw_dir)
  62                 home = "/";
  63         else
  64                 home = wstrdup(user->pw_dir);
  65
  66         return home;
  67 }
  68
  69 static char *getuserhomedir(const char *username)
  70 {
  71         static char *home = NULL;
  72         struct passwd *user;
  73
  74         if (home)
  75                 return home;
  76
  77         user = getpwnam(username);
  78         if (!user) {
  79                 werror(_("could not get password entry for user %s"), username);
  80                 return NULL;
  81         }
  82         if (!user->pw_dir)
  83                 home = "/";
  84         else
  85                 home = wstrdup(user->pw_dir);
  86
  87         return home;
  88 }
  89
  90 char *wexpandpath(char *path)
  91 {
  92         char *origpath = path;
  93         char buffer2[PATH_MAX + 2];
  94         char buffer[PATH_MAX + 2];
  95         int i;
  96
  97         memset(buffer, 0, PATH_MAX + 2);
  98
  99         if (*path == '~') {
 100                 char *home;
 101
 102                 path++;
 103                 if (*path == '/' || *path == 0) {
 104                         home = wgethomedir();
 105                         if (strlen(home) > PATH_MAX ||
 106                             wstrlcpy(buffer, home, sizeof(buffer)) >= sizeof(buffer))
 107                                 goto error;
 108                 } else {
 109                         int j;
 110                         j = 0;
 111                         while (*path != 0 && *path != '/') {
 112                                 if (j > PATH_MAX)
 113                                         goto error;
 114                                 buffer2[j++] = *path;
 115                                 buffer2[j] = 0;
 116                                 path++;
 117                         }
 118                         home = getuserhomedir(buffer2);
 119                         if (!home || wstrlcat(buffer, home, sizeof(buffer)) >= sizeof(buffer))
 120                                 goto error;
 121                 }
 122         }
 123
 124         i = strlen(buffer);
 125
 126         while (*path != 0 && i <= PATH_MAX) {
 127                 char *tmp;
 128
 129                 if (*path == '$') {
 130                         int j = 0;
 131                         path++;
 132                         /* expand $(HOME) or $HOME style environment variables */
 133                         if (*path == '(') {
 134                                 path++;
 135                                 while (*path != 0 && *path != ')') {
 136                                         if (j > PATH_MAX)
 137                                                 goto error;
 138                                         buffer2[j++] = *(path++);
 139                                         buffer2[j] = 0;
 140                                 }
 141                                 if (*path == ')') {
 142                                         path++;
 143                                         tmp = getenv(buffer2);
 144                                 } else {
 145                                         tmp = NULL;
 146                                 }
 147                                 if (!tmp) {
 148                                         if ((i += strlen(buffer2) + 2) > PATH_MAX)
 149                                                 goto error;
 150                                         buffer[i] = 0;
 151                                         if (wstrlcat(buffer, "$(", sizeof(buffer)) >= sizeof(buffer) ||
 152                                             wstrlcat(buffer, buffer2, sizeof(buffer)) >= sizeof(buffer))
 153                                                 goto error;
 154                                         if (*(path-1)==')') {
 155                                                 if (++i > PATH_MAX ||
 156                                                     wstrlcat(buffer, ")", sizeof(buffer)) >= sizeof(buffer))
 157                                                         goto error;
 158                                         }
 159                                 } else {
 160                                         if ((i += strlen(tmp)) > PATH_MAX ||
 161                                             wstrlcat(buffer, tmp, sizeof(buffer)) >= sizeof(buffer))
 162                                                 goto error;
 163                                 }
 164                         } else {
 165                                 while (*path != 0 && *path != '/') {
 166                                         if (j > PATH_MAX)
 167                                                 goto error;
 168                                         buffer2[j++] = *(path++);
 169                                         buffer2[j] = 0;
 170                                 }
 171                                 tmp = getenv(buffer2);
 172                                 if (!tmp) {
 173                                         if ((i += strlen(buffer2) + 1) > PATH_MAX ||
 174                                             wstrlcat(buffer, "$", sizeof(buffer)) >= sizeof(buffer) ||
 175                                             wstrlcat(buffer, buffer2, sizeof(buffer)) >= sizeof(buffer))
 176                                                 goto error;
 177                                 } else {
 178                                         if ((i += strlen(tmp)) > PATH_MAX ||
 179                                             wstrlcat(buffer, tmp, sizeof(buffer)) >= sizeof(buffer))
 180                                                 goto error;
 181                                 }
 182                         }
 183                 } else {
 184                         buffer[i++] = *path;
 185                         path++;
 186                 }
 187         }
 188
 189         if (*path!=0)
 190                 goto error;
 191
 192         return wstrdup(buffer);
 193
 194 error:
 195         errno = ENAMETOOLONG;
 196         werror(_("could not expand %s"), origpath);
 197
 198         return NULL;
 199 }
 200
 201 /* return address of next char != tok or end of string whichever comes first */
 202 static char *skipchar(char *string, char tok)
 203 {
 204         while (*string != 0 && *string == tok)
 205                 string++;
 206
 207         return string;
 208 }
 209
 210 /* return address of next char == tok or end of string whichever comes first */
 211 static char *nextchar(char *string, char tok)
 212 {
 213         while (*string != 0 && *string != tok)
 214                 string++;
 215
 216         return string;
 217 }
 218
 219 /*
 220  *----------------------------------------------------------------------
 221  * findfile--
 222  *      Finds a file in a : separated list of paths. ~ expansion is also
 223  * done.
 224  *
 225  * Returns:
 226  *      The complete path for the file (in a newly allocated string) or
 227  * NULL if the file was not found.
 228  *
 229  * Side effects:
 230  *      A new string is allocated. It must be freed later.
 231  *
 232  *----------------------------------------------------------------------
 233  */
 234 char *wfindfile(char *paths, char *file)
 235 {
 236         char *path;
 237         char *tmp, *tmp2;
 238         int len, flen;
 239         char *fullpath;
 240
 241         if (!file)
 242                 return NULL;
 243
 244         if (*file == '/' || *file == '~' || *file == '$' || !paths || *paths == 0) {
 245                 if (access(file, F_OK) < 0) {
 246                         fullpath = wexpandpath(file);
 247                         if (!fullpath)
 248                                 return NULL;
 249
 250                         if (access(fullpath, F_OK) < 0) {
 251                                 wfree(fullpath);
 252                                 return NULL;
 253                         } else {
 254                                 return fullpath;
 255                         }
 256                 } else {
 257                         return wstrdup(file);
 258                 }
 259         }
 260
 261         flen = strlen(file);
 262         tmp = paths;
 263         while (*tmp) {
 264                 tmp = skipchar(tmp, ':');
 265                 if (*tmp == 0)
 266                         break;
 267                 tmp2 = nextchar(tmp, ':');
 268                 len = tmp2 - tmp;
 269                 path = wmalloc(len + flen + 2);
 270                 path = memcpy(path, tmp, len);
 271                 path[len] = 0;
 272                 if (path[len - 1] != '/' &&
 273                     wstrlcat(path, "/", len + flen + 2) >= len + flen + 2) {
 274                         wfree(path);
 275                         return NULL;
 276                 }
 277
 278                 if (wstrlcat(path, file, len + flen + 2) >= len + flen + 2) {
 279                         wfree(path);
 280                         return NULL;
 281                 }
 282
 283                 fullpath = wexpandpath(path);
 284                 wfree(path);
 285
 286                 if (fullpath) {
 287                         if (access(fullpath, F_OK) == 0) {
 288                                 return fullpath;
 289                         }
 290                         wfree(fullpath);
 291                 }
 292                 tmp = tmp2;
 293         }
 294
 295         return NULL;
 296 }
 297
 298 char *wfindfileinlist(char **path_list, char *file)
 299 {
 300         int i;
 301         char *path;
 302         int len, flen;
 303         char *fullpath;
 304
 305         if (!file)
 306                 return NULL;
 307
 308         if (*file == '/' || *file == '~' || !path_list) {
 309                 if (access(file, F_OK) < 0) {
 310                         fullpath = wexpandpath(file);
 311                         if (!fullpath)
 312                                 return NULL;
 313
 314                         if (access(fullpath, F_OK) < 0) {
 315                                 wfree(fullpath);
 316                                 return NULL;
 317                         } else {
 318                                 return fullpath;
 319                         }
 320                 } else {
 321                         return wstrdup(file);
 322                 }
 323         }
 324
 325         flen = strlen(file);
 326         for (i = 0; path_list[i] != NULL; i++) {
 327                 len = strlen(path_list[i]);
 328                 path = wmalloc(len + flen + 2);
 329                 path = memcpy(path, path_list[i], len);
 330                 path[len] = 0;
 331                 if (wstrlcat(path, "/", len + flen + 2) >= len + flen + 2 ||
 332                     wstrlcat(path, file, len + flen + 2) >= len + flen + 2) {
 333                         wfree(path);
 334                         return NULL;
 335                 }
 336                 /* expand tilde */
 337                 fullpath = wexpandpath(path);
 338                 wfree(path);
 339                 if (fullpath) {
 340                         /* check if file exists */
 341                         if (access(fullpath, F_OK) == 0) {
 342                                 return fullpath;
 343                         }
 344                         wfree(fullpath);
 345                 }
 346         }
 347
 348         return NULL;
 349 }
 350
 351 char *wfindfileinarray(WMPropList * array, char *file)
 352 {
 353         int i;
 354         char *path;
 355         int len, flen;
 356         char *fullpath;
 357
 358         if (!file)
 359                 return NULL;
 360
 361         if (*file == '/' || *file == '~' || !array) {
 362                 if (access(file, F_OK) < 0) {
 363                         fullpath = wexpandpath(file);
 364                         if (!fullpath)
 365                                 return NULL;
 366
 367                         if (access(fullpath, F_OK) < 0) {
 368                                 wfree(fullpath);
 369                                 return NULL;
 370                         } else {
 371                                 return fullpath;
 372                         }
 373                 } else {
 374                         return wstrdup(file);
 375                 }
 376         }
 377
 378         flen = strlen(file);
 379         for (i = 0; i < WMGetPropListItemCount(array); i++) {
 380                 WMPropList *prop;
 381                 char *p;
 382
 383                 prop = WMGetFromPLArray(array, i);
 384                 if (!prop)
 385                         continue;
 386                 p = WMGetFromPLString(prop);
 387
 388                 len = strlen(p);
 389                 path = wmalloc(len + flen + 2);
 390                 path = memcpy(path, p, len);
 391                 path[len] = 0;
 392                 if (wstrlcat(path, "/", len + flen + 2) >= len + flen + 2 ||
 393                     wstrlcat(path, file, len + flen + 2) >= len + flen + 2) {
 394                         wfree(path);
 395                         return NULL;
 396                 }
 397                 /* expand tilde */
 398                 fullpath = wexpandpath(path);
 399                 wfree(path);
 400                 if (fullpath) {
 401                         /* check if file exists */
 402                         if (access(fullpath, F_OK) == 0) {
 403                                 return fullpath;
 404                         }
 405                         wfree(fullpath);
 406                 }
 407         }
 408         return NULL;
 409 }
 410
 411 int wcopy_file(char *dir, char *src_file, char *dest_file)
 412 {
 413         FILE *src, *dst;
 414         size_t nread, nwritten;
 415         char *dstpath;
 416         struct stat st;
 417         char buf[4096];
 418
 419         /* only to a directory */
 420         if (stat(dir, &st) != 0 || !S_ISDIR(st.st_mode))
 421                 return -1;
 422         /* only copy files */
 423         if (stat(src_file, &st) != 0 || !S_ISREG(st.st_mode))
 424                 return -1;
 425
 426         RETRY( src = fopen(src_file, "rb") )
 427         if (src == NULL) {
 428                 werror(_("Could not open %s"), src_file);
 429                 return -1;
 430         }
 431
 432         dstpath = wstrconcat(dir, dest_file);
 433         RETRY( dst = fopen(dstpath, "wb") )
 434         if (dst == NULL) {
 435                 werror(_("Could not create %s"), dstpath);
 436                 wfree(dstpath);
 437                 RETRY( fclose(src) )
 438                 return -1;
 439         }
 440
 441         do {
 442                 RETRY( nread = fread(buf, 1, sizeof(buf), src) )
 443                 if (ferror(src))
 444                         break;
 445
 446                 RETRY( nwritten = fwrite(buf, 1, nread, dst) )
 447                 if (ferror(dst) || feof(src) || nread != nwritten)
 448                         break;
 449
 450         } while (1);
 451
 452         if (ferror(src) || ferror(dst))
 453                 unlink(dstpath);
 454
 455         RETRY( fclose(src) )
 456         fchmod(fileno(dst), st.st_mode);
 457         fsync(fileno(dst));
 458         RETRY( fclose(dst) )
 459         wfree(dstpath);
 460
 461         return 0;
 462 }