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paths.c
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paths.c
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/*
* paths.c - Path manipulation routines
*/
/*
* Copyright (C) 2012, 2013 Eric Biggers
*
* This file 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 file 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 file; if not, see https://www.gnu.org/licenses/.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <string.h>
#include "wimlib.h"
#include "wimlib/paths.h"
#include "wimlib/util.h"
/* Like the basename() function, but does not modify @path; it just returns a
* pointer to it. This assumes the path separator is the
* OS_PREFERRED_PATH_SEPARATOR. */
const tchar *
path_basename(const tchar *path)
{
return path_basename_with_len(path, tstrlen(path));
}
/* Like path_basename(), but take an explicit string length. */
const tchar *
path_basename_with_len(const tchar *path, size_t len)
{
const tchar *p = &path[len];
do {
if (p == path)
return &path[len];
} while (*--p == OS_PREFERRED_PATH_SEPARATOR);
do {
if (p == path)
return &path[0];
} while (*--p != OS_PREFERRED_PATH_SEPARATOR);
return ++p;
}
/* Returns a pointer to the part of @path following the first colon in the last
* path component, or NULL if the last path component does not contain a colon
* or has no characters following the first colon. */
const tchar *
path_stream_name(const tchar *path)
{
const tchar *base = path_basename(path);
const tchar *stream_name = tstrchr(base, T(':'));
if (stream_name == NULL || *(stream_name + 1) == T('\0'))
return NULL;
else
return stream_name + 1;
}
/* Collapse and translate path separators, and strip trailing slashes. Doesn't
* add or delete a leading slash.
*
* @in may alias @out.
*/
void
do_canonicalize_path(const tchar *in, tchar *out)
{
tchar *orig_out = out;
while (*in) {
if (is_any_path_separator(*in)) {
/* Collapse multiple path separators into one */
*out++ = WIM_PATH_SEPARATOR;
do {
in++;
} while (is_any_path_separator(*in));
} else {
/* Copy non-path-separator character */
*out++ = *in++;
}
}
/* Remove trailing slash if existent */
if (out - orig_out > 1 && *(out - 1) == WIM_PATH_SEPARATOR)
--out;
*out = T('\0');
}
/*
* canonicalize_wim_path() - Given a user-provided path to a file within a WIM
* image, translate it into a "canonical" path.
*
* - Translate both types of slash into a consistent type (WIM_PATH_SEPARATOR).
* - Collapse path separators.
* - Add leading slash if missing.
* - Strip trailing slashes.
*
* Examples (with WIM_PATH_SEPARATOR == '/'):
*
* => / [ either NULL or empty string ]
* / => /
* \ => /
* hello => /hello
* \hello => /hello
* \hello => /hello
* /hello/ => /hello
* \hello/ => /hello
* /hello//1 => /hello/1
* \\hello\\1\\ => /hello/1
*/
tchar *
canonicalize_wim_path(const tchar *wim_path)
{
const tchar *in;
tchar *out;
tchar *result;
in = wim_path;
if (!in)
in = T("");
result = MALLOC((1 + tstrlen(in) + 1) * sizeof(result[0]));
if (!result)
return NULL;
out = result;
/* Add leading slash if missing */
if (!is_any_path_separator(*in))
*out++ = WIM_PATH_SEPARATOR;
do_canonicalize_path(in, out);
return result;
}