2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
5 * Created: Wed Jul 12 01:07:36 1995 ylo
15 * Expands tildes in the file name. Returns data allocated by xmalloc.
16 * Warning: this calls getpw*.
19 tilde_expand_filename(const char *filename, uid_t my_uid)
28 /* Return immediately if no tilde. */
29 if (filename[0] != '~')
30 return xstrdup(filename);
35 /* Find where the username ends. */
36 cp = strchr(filename, '/');
38 userlen = cp - filename; /* Something after username. */
40 userlen = strlen(filename); /* Nothing after username. */
42 pw = getpwuid(my_uid); /* Own home directory. */
44 /* Tilde refers to someone elses home directory. */
45 if (userlen > sizeof(user) - 1)
46 fatal("User name after tilde too long.");
47 memcpy(user, filename, userlen);
52 fatal("Unknown user %100s.", user);
54 /* If referring to someones home directory, return it now. */
56 /* Only home directory specified */
57 return xstrdup(pw->pw_dir);
59 /* Build a path combining the specified directory and path. */
60 len = strlen(pw->pw_dir) + strlen(cp + 1) + 2;
62 fatal("Home directory too long (%d > %d", len-1, MAXPATHLEN-1);
63 expanded = xmalloc(len);
64 snprintf(expanded, len, "%s/%s", pw->pw_dir, cp + 1);