WINGs/findfile.c

   1 /*
   2  *  Window Maker miscelaneous function library
   3  *
   4  *  Copyright (c) 1997 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
  22 #include "../src/config.h"
  23
  24 #include "WUtil.h"
  25
  26 #include <stdlib.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <pwd.h>
  30 #include <limits.h>
  31
  32 #ifndef PATH_MAX
  33 #define PATH_MAX  1024
  34 #endif
  35
  36
  37 char*
  38 wgethomedir()
  39 {
  40     char *home = getenv("HOME");
  41     struct passwd *user;
  42
  43     if (home)
  44       return home;
  45
  46     user = getpwuid(getuid());
  47     if (!user) {
  48         wsyserror("could not get password entry for UID %i", getuid());
  49         return "/";
  50     }
  51     if (!user->pw_dir) {
  52         return "/";
  53     } else {
  54         return user->pw_dir;
  55     }
  56 }
  57
  58
  59 static char*
  60 getuserhomedir(char *username)
  61 {
  62     struct passwd *user;
  63
  64     user = getpwnam(username);
  65     if (!user) {
  66         wsyserror("could not get password entry for user %s", username);
  67         return NULL;
  68     }
  69     if (!user->pw_dir) {
  70         return "/";
  71     } else {
  72         return user->pw_dir;
  73     }
  74 }
  75
  76
  77
  78
  79 char*
  80 wexpandpath(char *path)
  81 {
  82     char buffer2[PATH_MAX+2];
  83     char buffer[PATH_MAX+2];
  84     int i;
  85
  86     memset(buffer, 0, PATH_MAX+2);
  87
  88     if (*path=='~') {
  89         char *home;
  90
  91         path++;
  92         if (*path=='/' || *path==0) {
  93             home = wgethomedir();
  94             strcat(buffer, home);
  95         } else {
  96             int j;
  97             j = 0;
  98             while (*path!=0 && *path!='/') {
  99                 buffer2[j++] = *path;
 100                 buffer2[j] = 0;
 101                 path++;
 102             }
 103             home = getuserhomedir(buffer2);
 104             if (!home)
 105                 return NULL;
 106             strcat(buffer, home);
 107         }
 108     }
 109
 110     i = strlen(buffer);
 111
 112     while (*path!=0) {
 113         char *tmp;
 114
 115         if (*path=='$') {
 116             int j = 0;
 117             path++;
 118             /* expand $(HOME) or $HOME style environment variables */
 119             if (*path=='(') {
 120                 path++;
 121                 while (*path!=0 && *path!=')') {
 122                     buffer2[j++] = *(path++);
 123                     buffer2[j] = 0;
 124                 }
 125                 if (*path==')')
 126                     path++;
 127                 tmp = getenv(buffer2);
 128                 if (!tmp) {
 129                     buffer[i] = 0;
 130                     strcat(buffer, "$(");
 131                     strcat(buffer, buffer2);
 132                     strcat(buffer, ")");
 133                     i += strlen(buffer2)+3;
 134                 } else {
 135                     strcat(buffer, tmp);
 136                     i += strlen(tmp);
 137                 }
 138             } else {
 139                 while (*path!=0 && *path!='/') {
 140                     buffer2[j++] = *(path++);
 141                     buffer2[j] = 0;
 142                 }
 143                 tmp = getenv(buffer2);
 144                 if (!tmp) {
 145                     strcat(buffer, "$");
 146                     strcat(buffer, buffer2);
 147                     i += strlen(buffer2)+1;
 148                 } else {
 149                     strcat(buffer, tmp);
 150                     i += strlen(tmp);
 151                 }
 152             }
 153         } else {
 154             buffer[i++] = *path;
 155             path++;
 156         }
 157     }
 158
 159     return wstrdup(buffer);
 160 }
 161
 162
 163
 164 /*
 165  *----------------------------------------------------------------------
 166  * findfile--
 167  *      Finds a file in a : separated list of paths. ~ expansion is also
 168  * done.
 169  *
 170  * Returns:
 171  *      The complete path for the file (in a newly allocated string) or
 172  * NULL if the file was not found.
 173  *
 174  * Side effects:
 175  *      A new string is allocated. It must be freed later.
 176  *
 177  *----------------------------------------------------------------------
 178  */
 179 char*
 180 wfindfile(char *paths, char *file)
 181 {
 182     char *path;
 183     char *tmp;
 184     int done;
 185     int len, flen;
 186     char *fullpath;
 187
 188     if (!file)
 189         return NULL;
 190
 191     if (*file=='/' || *file=='~' || *file=='$' || !paths) {
 192         if (access(file, R_OK)<0) {
 193             fullpath = wexpandpath(file);
 194             if (!fullpath)
 195                 return NULL;
 196
 197             if (access(fullpath, R_OK)<0) {
 198                 free(fullpath);
 199                 return NULL;
 200             } else {
 201                 return fullpath;
 202             }
 203         } else {
 204             return wstrdup(file);
 205         }
 206     }
 207
 208     flen = strlen(file);
 209     tmp = paths;
 210     done = 0;
 211     while (!done) {
 212         len = strcspn(tmp, ":");
 213         if (len==0) done=1;
 214         path = wmalloc(len+flen+2);
 215         path = memcpy(path, tmp, len);
 216         path[len]=0;
 217         strcat(path, "/");
 218         strcat(path, file);
 219         fullpath = wexpandpath(path);
 220         free(path);
 221         if (fullpath) {
 222             if (access(fullpath, R_OK)==0) {
 223                 return fullpath;
 224             }
 225             free(fullpath);
 226         }
 227         tmp=&(tmp[len+1]);
 228         if (*tmp==0) break;
 229     }
 230     return NULL;
 231 }
 232
 233
 234 char*
 235 wfindfileinlist(char **path_list, char *file)
 236 {
 237     int i;
 238     char *path;
 239     int len, flen;
 240     char *fullpath;
 241
 242     if (!file)
 243         return NULL;
 244
 245     if (*file=='/' || *file=='~' || !path_list) {
 246         if (access(file, R_OK)<0) {
 247             fullpath = wexpandpath(file);
 248             if (!fullpath)
 249                 return NULL;
 250
 251             if (access(fullpath, R_OK)<0) {
 252                 free(fullpath);
 253                 return NULL;
 254             } else {
 255                 return fullpath;
 256             }
 257         } else {
 258             return wstrdup(file);
 259         }
 260     }
 261
 262     flen = strlen(file);
 263     for (i=0; path_list[i]!=NULL; i++) {
 264         len = strlen(path_list[i]);
 265         path = wmalloc(len+flen+2);
 266         path = memcpy(path, path_list[i], len);
 267         path[len]=0;
 268         strcat(path, "/");
 269         strcat(path, file);
 270         /* expand tilde */
 271         fullpath = wexpandpath(path);
 272         free(path);
 273         if (fullpath) {
 274             /* check if file is readable */
 275             if (access(fullpath, R_OK)==0) {
 276                 return fullpath;
 277             }
 278             free(fullpath);
 279         }
 280     }
 281     return NULL;
 282 }
 283
 284
 285