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/*
tildexpand.c
Author: Tatu Ylonen <ylo@cs.hut.fi>
Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
All rights reserved
Created: Wed Jul 12 01:07:36 1995 ylo
*/
#include "includes.h"
RCSID("$Id: tildexpand.c,v 1.2 1999/09/30 16:48:48 deraadt Exp $");
#include "xmalloc.h"
#include "ssh.h"
/* Expands tildes in the file name. Returns data allocated by xmalloc.
Warning: this calls getpw*. */
char *tilde_expand_filename(const char *filename, uid_t my_uid)
{
const char *cp;
unsigned int userlen;
char *expanded;
struct passwd *pw;
char user[100];
/* Return immediately if no tilde. */
if (filename[0] != '~')
return xstrdup(filename);
/* Skip the tilde. */
filename++;
/* Find where the username ends. */
cp = strchr(filename, '/');
if (cp)
userlen = cp - filename; /* Have something after username. */
else
userlen = strlen(filename); /* Nothign after username. */
if (userlen == 0)
pw = getpwuid(my_uid); /* Own home directory. */
else
{
/* Tilde refers to someone elses home directory. */
if (userlen > sizeof(user) - 1)
fatal("User name after tilde too long.");
memcpy(user, filename, userlen);
user[userlen] = 0;
pw = getpwnam(user);
}
/* Check that we found the user. */
if (!pw)
fatal("Unknown user %100s.", user);
/* If referring to someones home directory, return it now. */
if (!cp)
{ /* Only home directory specified */
return xstrdup(pw->pw_dir);
}
/* Build a path combining the specified directory and path. */
expanded = xmalloc(strlen(pw->pw_dir) + strlen(cp + 1) + 2);
sprintf(expanded, "%s/%s", pw->pw_dir, cp + 1);
return expanded;
}
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