tilde.c
2.93 KB
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/* GNU Mailutils -- a suite of utilities for electronic mail
Copyright (C) 1999-2003, 2005-2007, 2009-2012, 2014-2017 Free
Software Foundation, Inc.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General
Public License along with this library. If not, see
<http://www.gnu.org/licenses/>. */
#if HAVE_CONFIG_H
# include <config.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <mailutils/types.h>
#include <mailutils/cctype.h>
#include <mailutils/util.h>
#include <mailutils/mu_auth.h>
/* NOTE: Allocates Memory. */
/* Expand: ~ --> /home/user and to ~guest --> /home/guest. */
char *
mu_tilde_expansion (const char *ref, int delim, const char *homedir)
{
char *base = strdup (ref);
char *home = NULL;
char *proto = NULL;
size_t proto_len = 0;
char *p;
if (!base)
return NULL;
for (p = base; *p && mu_isascii (*p) && mu_isalnum (*p); p++)
;
if (*p == ':')
{
p++;
proto_len = p - base;
proto = malloc (proto_len + 1);
if (!proto)
return NULL;
memcpy (proto, base, proto_len);
proto[proto_len] = 0;
/* Allow for extra pair of slashes after the protocol specifier */
if (*p == delim)
p++;
if (*p == delim)
p++;
}
else
p = base;
if (*p == '~')
{
p++;
if (*p == delim || *p == '\0')
{
char *s;
if (!homedir)
{
home = mu_get_homedir ();
if (!home)
return base;
homedir = home;
}
s = calloc (proto_len + strlen (homedir) + strlen (p) + 1, 1);
if (proto_len)
strcpy (s, proto);
else
s[0] = 0;
strcat (s, homedir);
strcat (s, p);
free (base);
base = s;
}
else
{
struct mu_auth_data *auth;
char *s = p;
char *name;
while (*s && *s != delim)
s++;
name = calloc (s - p + 1, 1);
memcpy (name, p, s - p);
name[s - p] = '\0';
auth = mu_get_auth_by_name (name);
free (name);
if (auth)
{
char *buf = calloc (proto_len + strlen (auth->dir)
+ strlen (s) + 1, 1);
if (proto_len)
strcpy (buf, proto);
else
buf[0] = 0;
strcat (buf, auth->dir);
strcat (buf, s);
free (base);
base = buf;
mu_auth_data_free (auth);
}
}
}
if (home)
free (home);
return base;
}