distr/util/texpand.c

   1 /* LINTLIBRARY */
   2
   3 #include <stdio.h>
   4 #include "util.h"
   5
   6 #ifdef BSD
   7 #include <pwd.h>
   8 #endif
   9
  10
  11 char *
  12 util_tilde_expand(char const *fname)
  13 {
  14 #ifdef BSD
  15     struct passwd *userRecord;
  16     char username[256], *filename;
  17     register int i, j;
  18
  19     filename = ALLOC(char, strlen(fname) + 256);
  20
  21     /* Clear the return string */
  22     i = 0;
  23     filename[0] = '\0';
  24
  25     /* Tilde? */
  26     if (fname[0] == '~') {
  27         j = 0;
  28         i = 1;
  29         while ((fname[i] != '\0') && (fname[i] != '/')) {
  30             username[j++] = fname[i++];
  31         }
  32         username[j] = '\0';
  33
  34         if (username[0] == '\0') {
  35             /* ~/ resolves to home directory of current user */
  36             if ((userRecord = getpwuid(getuid())) != 0) {
  37                 (void) strcat(filename, userRecord->pw_dir);
  38             } else {
  39                 i = 0;
  40             }
  41         } else {
  42             /* ~user/ resolves to home directory of 'user' */
  43             if ((userRecord = getpwnam(username)) != 0) {
  44                 (void) strcat(filename, userRecord->pw_dir);
  45             } else {
  46                 i = 0;
  47             }
  48         }
  49     }
  50
  51     /* Concantenate remaining portion of file name */
  52     (void) strcat(filename, fname + i);
  53     return filename;
  54 #else
  55     return strsav(fname);
  56 #endif
  57 }