71 lines
1.7 KiB
C
71 lines
1.7 KiB
C
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/*
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tildexpand.c
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Author: Tatu Ylonen <ylo@cs.hut.fi>
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Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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All rights reserved
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Created: Wed Jul 12 01:07:36 1995 ylo
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*/
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#include "includes.h"
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RCSID("$Id: tildexpand.c,v 1.1 1999/10/27 03:42:46 damien Exp $");
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#include "xmalloc.h"
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#include "ssh.h"
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/* Expands tildes in the file name. Returns data allocated by xmalloc.
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Warning: this calls getpw*. */
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char *tilde_expand_filename(const char *filename, uid_t my_uid)
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{
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const char *cp;
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unsigned int userlen;
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char *expanded;
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struct passwd *pw;
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char user[100];
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/* Return immediately if no tilde. */
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if (filename[0] != '~')
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return xstrdup(filename);
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/* Skip the tilde. */
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filename++;
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/* Find where the username ends. */
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cp = strchr(filename, '/');
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if (cp)
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userlen = cp - filename; /* Have something after username. */
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else
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userlen = strlen(filename); /* Nothign after username. */
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if (userlen == 0)
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pw = getpwuid(my_uid); /* Own home directory. */
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else
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{
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/* Tilde refers to someone elses home directory. */
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if (userlen > sizeof(user) - 1)
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fatal("User name after tilde too long.");
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memcpy(user, filename, userlen);
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user[userlen] = 0;
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pw = getpwnam(user);
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}
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/* Check that we found the user. */
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if (!pw)
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fatal("Unknown user %100s.", user);
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/* If referring to someones home directory, return it now. */
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if (!cp)
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{ /* Only home directory specified */
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return xstrdup(pw->pw_dir);
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}
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/* Build a path combining the specified directory and path. */
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expanded = xmalloc(strlen(pw->pw_dir) + strlen(cp + 1) + 2);
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sprintf(expanded, "%s/%s", pw->pw_dir, cp + 1);
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return expanded;
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}
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