2 * Author: Tatu Ylonen <ylo@cs.hut.fi>
3 * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
6 * As far as I am concerned, the code I have written for this software
7 * can be used freely for any purpose. Any derived versions of this
8 * software must be clearly marked as such, and if the derived work is
9 * incompatible with the protocol description in the RFC file, it must be
10 * called by a name other than "ssh" or "Secure Shell".
14 RCSID("$OpenBSD: tildexpand.c,v 1.15 2004/05/21 08:43:03 markus Exp $");
21 * Expands tildes in the file name. Returns data allocated by xmalloc.
22 * Warning: this calls getpw*.
25 tilde_expand_filename(const char *filename, uid_t my_uid)
34 /* Return immediately if no tilde. */
35 if (filename[0] != '~')
36 return xstrdup(filename);
41 /* Find where the username ends. */
42 cp = strchr(filename, '/');
44 userlen = cp - filename; /* Something after username. */
46 userlen = strlen(filename); /* Nothing after username. */
48 pw = getpwuid(my_uid); /* Own home directory. */
50 /* Tilde refers to someone elses home directory. */
51 if (userlen > sizeof(user) - 1)
52 fatal("User name after tilde too long.");
53 memcpy(user, filename, userlen);
58 fatal("Unknown user %100s.", user);
60 /* If referring to someones home directory, return it now. */
62 /* Only home directory specified */
63 return xstrdup(pw->pw_dir);
65 /* Build a path combining the specified directory and path. */
66 len = strlen(pw->pw_dir) + strlen(cp + 1) + 2;
68 fatal("Home directory too long (%d > %d", len-1, MAXPATHLEN-1);
69 expanded = xmalloc(len);
70 snprintf(expanded, len, "%s%s%s", pw->pw_dir,
71 strcmp(pw->pw_dir, "/") ? "/" : "", cp + 1);