path.c 38.9 KB
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/*
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 * Copyright (C) the libgit2 contributors. All rights reserved.
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 *
 * This file is part of libgit2, distributed under the GNU GPL v2 with
 * a Linking Exception. For full terms see the included COPYING file.
 */
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#include "path.h"
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#include "posix.h"
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#include "repository.h"
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#ifdef GIT_WIN32
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#include "win32/posix.h"
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#include "win32/w32_buffer.h"
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#include "win32/w32_util.h"
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#include "win32/version.h"
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#else
#include <dirent.h>
#endif
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#include <stdio.h>
#include <ctype.h>

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#define LOOKS_LIKE_DRIVE_PREFIX(S) (git__isalpha((S)[0]) && (S)[1] == ':')

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#ifdef GIT_WIN32
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static bool looks_like_network_computer_name(const char *path, int pos)
{
	if (pos < 3)
		return false;

	if (path[0] != '/' || path[1] != '/')
		return false;

	while (pos-- > 2) {
		if (path[pos] == '/')
			return false;
	}

	return true;
}
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#endif
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/*
 * Based on the Android implementation, BSD licensed.
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 * http://android.git.kernel.org/
 *
 * Copyright (C) 2008 The Android Open Source Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
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 */
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int git_path_basename_r(git_buf *buffer, const char *path)
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{
	const char *endp, *startp;
	int len, result;

	/* Empty or NULL string gets treated as "." */
	if (path == NULL || *path == '\0') {
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		startp = ".";
		len		= 1;
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		goto Exit;
	}

	/* Strip trailing slashes */
	endp = path + strlen(path) - 1;
	while (endp > path && *endp == '/')
		endp--;

	/* All slashes becomes "/" */
	if (endp == path && *endp == '/') {
		startp = "/";
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		len	= 1;
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		goto Exit;
	}

	/* Find the start of the base */
	startp = endp;
	while (startp > path && *(startp - 1) != '/')
		startp--;

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	/* Cast is safe because max path < max int */
	len = (int)(endp - startp + 1);
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Exit:
	result = len;

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	if (buffer != NULL && git_buf_set(buffer, startp, len) < 0)
		return -1;
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	return result;
}

/*
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 * Determine if the path is a Windows prefix and, if so, returns
 * its actual lentgh. If it is not a prefix, returns -1.
 */
static int win32_prefix_length(const char *path, int len)
{
#ifndef GIT_WIN32
	GIT_UNUSED(path);
	GIT_UNUSED(len);
#else
	/*
	 * Mimic unix behavior where '/.git' returns '/': 'C:/.git' will return
	 * 'C:/' here
	 */
	if (len == 2 && LOOKS_LIKE_DRIVE_PREFIX(path))
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		return 2;
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	/*
	 * Similarly checks if we're dealing with a network computer name
	 * '//computername/.git' will return '//computername/'
	 */
	if (looks_like_network_computer_name(path, len))
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		return len;
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#endif

	return -1;
}

/*
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 * Based on the Android implementation, BSD licensed.
 * Check http://android.git.kernel.org/
 */
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int git_path_dirname_r(git_buf *buffer, const char *path)
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{
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	const char *endp;
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	int is_prefix = 0, len;
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	/* Empty or NULL string gets treated as "." */
	if (path == NULL || *path == '\0') {
		path = ".";
		len = 1;
		goto Exit;
	}

	/* Strip trailing slashes */
	endp = path + strlen(path) - 1;
	while (endp > path && *endp == '/')
		endp--;

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	if ((len = win32_prefix_length(path, endp - path + 1)) > 0) {
		is_prefix = 1;
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		goto Exit;
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	}
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	/* Find the start of the dir */
	while (endp > path && *endp != '/')
		endp--;

	/* Either the dir is "/" or there are no slashes */
	if (endp == path) {
		path = (*endp == '/') ? "/" : ".";
		len = 1;
		goto Exit;
	}

	do {
		endp--;
	} while (endp > path && *endp == '/');

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	if ((len = win32_prefix_length(path, endp - path + 1)) > 0) {
		is_prefix = 1;
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		goto Exit;
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	}
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	/* Cast is safe because max path < max int */
	len = (int)(endp - path + 1);
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Exit:
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	if (buffer) {
		if (git_buf_set(buffer, path, len) < 0)
			return -1;
		if (is_prefix && git_buf_putc(buffer, '/') < 0)
			return -1;
	}
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	return len;
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}


char *git_path_dirname(const char *path)
{
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	git_buf buf = GIT_BUF_INIT;
	char *dirname;
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	git_path_dirname_r(&buf, path);
	dirname = git_buf_detach(&buf);
	git_buf_free(&buf); /* avoid memleak if error occurs */
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	return dirname;
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}

char *git_path_basename(const char *path)
{
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	git_buf buf = GIT_BUF_INIT;
	char *basename;
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	git_path_basename_r(&buf, path);
	basename = git_buf_detach(&buf);
	git_buf_free(&buf); /* avoid memleak if error occurs */
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	return basename;
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}

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size_t git_path_basename_offset(git_buf *buffer)
{
	ssize_t slash;

	if (!buffer || buffer->size <= 0)
		return 0;

	slash = git_buf_rfind_next(buffer, '/');

	if (slash >= 0 && buffer->ptr[slash] == '/')
		return (size_t)(slash + 1);

	return 0;
}
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const char *git_path_topdir(const char *path)
{
	size_t len;
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	ssize_t i;
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	assert(path);
	len = strlen(path);

	if (!len || path[len - 1] != '/')
		return NULL;

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	for (i = (ssize_t)len - 2; i >= 0; --i)
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		if (path[i] == '/')
			break;

	return &path[i + 1];
}

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int git_path_root(const char *path)
{
	int offset = 0;

	/* Does the root of the path look like a windows drive ? */
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	if (LOOKS_LIKE_DRIVE_PREFIX(path))
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		offset += 2;
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#ifdef GIT_WIN32
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	/* Are we dealing with a windows network path? */
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	else if ((path[0] == '/' && path[1] == '/' && path[2] != '/') ||
		(path[0] == '\\' && path[1] == '\\' && path[2] != '\\'))
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	{
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		offset += 2;
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		/* Skip the computer name segment */
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		while (path[offset] && path[offset] != '/' && path[offset] != '\\')
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			offset++;
	}
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#endif

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	if (path[offset] == '/' || path[offset] == '\\')
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		return offset;

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	return -1;	/* Not a real error - signals that path is not rooted */
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}

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void git_path_trim_slashes(git_buf *path)
{
	int ceiling = git_path_root(path->ptr) + 1;
	assert(ceiling >= 0);

	while (path->size > (size_t)ceiling) {
		if (path->ptr[path->size-1] != '/')
			break;

		path->ptr[path->size-1] = '\0';
		path->size--;
	}
}

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int git_path_join_unrooted(
	git_buf *path_out, const char *path, const char *base, ssize_t *root_at)
{
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	ssize_t root;
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	assert(path && path_out);

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	root = (ssize_t)git_path_root(path);
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	if (base != NULL && root < 0) {
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		if (git_buf_joinpath(path_out, base, path) < 0)
			return -1;
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		root = (ssize_t)strlen(base);
	} else {
		if (git_buf_sets(path_out, path) < 0)
			return -1;
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		if (root < 0)
			root = 0;
		else if (base)
			git_path_equal_or_prefixed(base, path, &root);
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	}

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	if (root_at)
		*root_at = root;

	return 0;
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}

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void git_path_squash_slashes(git_buf *path)
{
	char *p, *q;

	if (path->size == 0)
		return;

	for (p = path->ptr, q = path->ptr; *q; p++, q++) {
		*p = *q;

		while (*q == '/' && *(q+1) == '/') {
			path->size--;
			q++;
		}
	}

	*p = '\0';
}

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int git_path_prettify(git_buf *path_out, const char *path, const char *base)
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{
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	char buf[GIT_PATH_MAX];
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	assert(path && path_out);
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	/* construct path if needed */
	if (base != NULL && git_path_root(path) < 0) {
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		if (git_buf_joinpath(path_out, base, path) < 0)
			return -1;
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		path = path_out->ptr;
	}

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	if (p_realpath(path, buf) == NULL) {
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		/* giterr_set resets the errno when dealing with a GITERR_OS kind of error */
		int error = (errno == ENOENT || errno == ENOTDIR) ? GIT_ENOTFOUND : -1;
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		giterr_set(GITERR_OS, "failed to resolve path '%s'", path);
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		git_buf_clear(path_out);
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		return error;
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	}
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	return git_buf_sets(path_out, buf);
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}

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int git_path_prettify_dir(git_buf *path_out, const char *path, const char *base)
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{
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	int error = git_path_prettify(path_out, path, base);
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	return (error < 0) ? error : git_path_to_dir(path_out);
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}
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int git_path_to_dir(git_buf *path)
{
	if (path->asize > 0 &&
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		git_buf_len(path) > 0 &&
		path->ptr[git_buf_len(path) - 1] != '/')
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		git_buf_putc(path, '/');
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	return git_buf_oom(path) ? -1 : 0;
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}
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void git_path_string_to_dir(char* path, size_t size)
{
	size_t end = strlen(path);

	if (end && path[end - 1] != '/' && end < size) {
		path[end] = '/';
		path[end + 1] = '\0';
	}
}

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int git__percent_decode(git_buf *decoded_out, const char *input)
{
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	int len, hi, lo, i;
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	assert(decoded_out && input);

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	len = (int)strlen(input);
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	git_buf_clear(decoded_out);

	for(i = 0; i < len; i++)
	{
		char c = input[i];

		if (c != '%')
			goto append;

		if (i >= len - 2)
			goto append;

		hi = git__fromhex(input[i + 1]);
		lo = git__fromhex(input[i + 2]);

		if (hi < 0 || lo < 0)
			goto append;

		c = (char)(hi << 4 | lo);
		i += 2;

append:
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		if (git_buf_putc(decoded_out, c) < 0)
			return -1;
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	}

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	return 0;
}

static int error_invalid_local_file_uri(const char *uri)
{
	giterr_set(GITERR_CONFIG, "'%s' is not a valid local file URI", uri);
	return -1;
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}
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static int local_file_url_prefixlen(const char *file_url)
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{
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	int len = -1;
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	if (git__prefixcmp(file_url, "file://") == 0) {
		if (file_url[7] == '/')
			len = 8;
		else if (git__prefixcmp(file_url + 7, "localhost/") == 0)
			len = 17;
	}
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	return len;
}
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bool git_path_is_local_file_url(const char *file_url)
{
	return (local_file_url_prefixlen(file_url) > 0);
}
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int git_path_fromurl(git_buf *local_path_out, const char *file_url)
{
	int offset;
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	assert(local_path_out && file_url);

	if ((offset = local_file_url_prefixlen(file_url)) < 0 ||
		file_url[offset] == '\0' || file_url[offset] == '/')
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		return error_invalid_local_file_uri(file_url);
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#ifndef GIT_WIN32
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	offset--;	/* A *nix absolute path starts with a forward slash */
#endif

	git_buf_clear(local_path_out);
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	return git__percent_decode(local_path_out, file_url + offset);
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}
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int git_path_walk_up(
	git_buf *path,
	const char *ceiling,
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	int (*cb)(void *data, const char *),
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	void *data)
{
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	int error = 0;
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	git_buf iter;
	ssize_t stop = 0, scan;
	char oldc = '\0';

	assert(path && cb);

	if (ceiling != NULL) {
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		if (git__prefixcmp(path->ptr, ceiling) == 0)
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			stop = (ssize_t)strlen(ceiling);
		else
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			stop = git_buf_len(path);
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	}
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	scan = git_buf_len(path);
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	/* empty path: yield only once */
	if (!scan) {
		error = cb(data, "");
		if (error)
			giterr_set_after_callback(error);
		return error;
	}

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	iter.ptr = path->ptr;
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	iter.size = git_buf_len(path);
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	iter.asize = path->asize;
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	while (scan >= stop) {
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		error = cb(data, iter.ptr);
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		iter.ptr[scan] = oldc;
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		if (error) {
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			giterr_set_after_callback(error);
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			break;
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		}
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		scan = git_buf_rfind_next(&iter, '/');
		if (scan >= 0) {
			scan++;
			oldc = iter.ptr[scan];
			iter.size = scan;
			iter.ptr[scan] = '\0';
		}
	}

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	if (scan >= 0)
		iter.ptr[scan] = oldc;
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	/* relative path: yield for the last component */
	if (!error && stop == 0 && iter.ptr[0] != '/') {
		error = cb(data, "");
		if (error)
			giterr_set_after_callback(error);
	}

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	return error;
}
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bool git_path_exists(const char *path)
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{
	assert(path);
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	return p_access(path, F_OK) == 0;
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}

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bool git_path_isdir(const char *path)
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{
	struct stat st;
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	if (p_stat(path, &st) < 0)
		return false;
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	return S_ISDIR(st.st_mode) != 0;
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}

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bool git_path_isfile(const char *path)
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{
	struct stat st;

	assert(path);
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	if (p_stat(path, &st) < 0)
		return false;
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	return S_ISREG(st.st_mode) != 0;
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}

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bool git_path_islink(const char *path)
{
	struct stat st;

	assert(path);
	if (p_lstat(path, &st) < 0)
		return false;

	return S_ISLNK(st.st_mode) != 0;
}

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#ifdef GIT_WIN32

bool git_path_is_empty_dir(const char *path)
{
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	git_win32_path filter_w;
	bool empty = false;

	if (git_win32__findfirstfile_filter(filter_w, path)) {
		WIN32_FIND_DATAW findData;
		HANDLE hFind = FindFirstFileW(filter_w, &findData);

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		/* FindFirstFile will fail if there are no children to the given
		 * path, which can happen if the given path is a file (and obviously
		 * has no children) or if the given path is an empty mount point.
		 * (Most directories have at least directory entries '.' and '..',
		 * but ridiculously another volume mounted in another drive letter's
		 * path space do not, and thus have nothing to enumerate.)  If
		 * FindFirstFile fails, check if this is a directory-like thing
		 * (a mount point).
		 */
		if (hFind == INVALID_HANDLE_VALUE)
			return git_path_isdir(path);

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		/* If the find handle was created successfully, then it's a directory */
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		empty = true;

		do {
			/* Allow the enumeration to return . and .. and still be considered
			 * empty. In the special case of drive roots (i.e. C:\) where . and
			 * .. do not occur, we can still consider the path to be an empty
			 * directory if there's nothing there. */
			if (!git_path_is_dot_or_dotdotW(findData.cFileName)) {
				empty = false;
				break;
			}
		} while (FindNextFileW(hFind, &findData));

		FindClose(hFind);
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	}
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	return empty;
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}

#else

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static int path_found_entry(void *payload, git_buf *path)
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{
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	GIT_UNUSED(payload);
	return !git_path_is_dot_or_dotdot(path->ptr);
}
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bool git_path_is_empty_dir(const char *path)
{
	int error;
	git_buf dir = GIT_BUF_INIT;
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	if (!git_path_isdir(path))
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		return false;

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	if ((error = git_buf_sets(&dir, path)) != 0)
		giterr_clear();
	else
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		error = git_path_direach(&dir, 0, path_found_entry, NULL);
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	git_buf_free(&dir);

	return !error;
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}
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#endif

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int git_path_set_error(int errno_value, const char *path, const char *action)
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{
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	switch (errno_value) {
	case ENOENT:
	case ENOTDIR:
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		giterr_set(GITERR_OS, "could not find '%s' to %s", path, action);
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		return GIT_ENOTFOUND;

	case EINVAL:
	case ENAMETOOLONG:
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		giterr_set(GITERR_OS, "invalid path for filesystem '%s'", path);
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		return GIT_EINVALIDSPEC;

	case EEXIST:
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		giterr_set(GITERR_OS, "failed %s - '%s' already exists", action, path);
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		return GIT_EEXISTS;
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	case EACCES:
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		giterr_set(GITERR_OS, "failed %s - '%s' is locked", action, path);
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		return GIT_ELOCKED;

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	default:
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		giterr_set(GITERR_OS, "could not %s '%s'", action, path);
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		return -1;
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	}
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}

int git_path_lstat(const char *path, struct stat *st)
{
	if (p_lstat(path, st) == 0)
		return 0;
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	return git_path_set_error(errno, path, "stat");
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}

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static bool _check_dir_contents(
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	git_buf *dir,
	const char *sub,
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	bool (*predicate)(const char *))
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{
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	bool result;
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	size_t dir_size = git_buf_len(dir);
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	size_t sub_size = strlen(sub);
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	size_t alloc_size;
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	/* leave base valid even if we could not make space for subdir */
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	if (GIT_ADD_SIZET_OVERFLOW(&alloc_size, dir_size, sub_size) ||
		GIT_ADD_SIZET_OVERFLOW(&alloc_size, alloc_size, 2) ||
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		git_buf_try_grow(dir, alloc_size, false) < 0)
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		return false;

	/* save excursion */
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	if (git_buf_joinpath(dir, dir->ptr, sub) < 0)
		return false;
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	result = predicate(dir->ptr);
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	/* restore path */
	git_buf_truncate(dir, dir_size);
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	return result;
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}

714
bool git_path_contains(git_buf *dir, const char *item)
715
{
716
	return _check_dir_contents(dir, item, &git_path_exists);
717 718
}

719
bool git_path_contains_dir(git_buf *base, const char *subdir)
720
{
721
	return _check_dir_contents(base, subdir, &git_path_isdir);
722 723
}

724
bool git_path_contains_file(git_buf *base, const char *file)
725
{
726
	return _check_dir_contents(base, file, &git_path_isfile);
727 728 729 730
}

int git_path_find_dir(git_buf *dir, const char *path, const char *base)
{
731
	int error = git_path_join_unrooted(dir, path, base, NULL);
732

733
	if (!error) {
734 735 736 737 738 739
		char buf[GIT_PATH_MAX];
		if (p_realpath(dir->ptr, buf) != NULL)
			error = git_buf_sets(dir, buf);
	}

	/* call dirname if this is not a directory */
740
	if (!error) /* && git_path_isdir(dir->ptr) == false) */
741
		error = (git_path_dirname_r(dir, dir->ptr) < 0) ? -1 : 0;
742

743
	if (!error)
744 745 746 747 748
		error = git_path_to_dir(dir);

	return error;
}

749 750 751 752 753
int git_path_resolve_relative(git_buf *path, size_t ceiling)
{
	char *base, *to, *from, *next;
	size_t len;

754
	GITERR_CHECK_ALLOC_BUF(path);
755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780

	if (ceiling > path->size)
		ceiling = path->size;

	/* recognize drive prefixes, etc. that should not be backed over */
	if (ceiling == 0)
		ceiling = git_path_root(path->ptr) + 1;

	/* recognize URL prefixes that should not be backed over */
	if (ceiling == 0) {
		for (next = path->ptr; *next && git__isalpha(*next); ++next);
		if (next[0] == ':' && next[1] == '/' && next[2] == '/')
			ceiling = (next + 3) - path->ptr;
	}

	base = to = from = path->ptr + ceiling;

	while (*from) {
		for (next = from; *next && *next != '/'; ++next);

		len = next - from;

		if (len == 1 && from[0] == '.')
			/* do nothing with singleton dot */;

		else if (len == 2 && from[0] == '.' && from[1] == '.') {
781 782 783
			/* error out if trying to up one from a hard base */
			if (to == base && ceiling != 0) {
				giterr_set(GITERR_INVALID,
784
					"cannot strip root component off url");
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807
				return -1;
			}

			/* no more path segments to strip,
			 * use '../' as a new base path */
			if (to == base) {
				if (*next == '/')
					len++;

				if (to != from)
					memmove(to, from, len);

				to += len;
				/* this is now the base, can't back up from a
				 * relative prefix */
				base = to;
			} else {
				/* back up a path segment */
				while (to > base && to[-1] == '/') to--;
				while (to > base && to[-1] != '/') to--;
			}
		} else {
			if (*next == '/' && *from != '/')
808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829
				len++;

			if (to != from)
				memmove(to, from, len);

			to += len;
		}

		from += len;

		while (*from == '/') from++;
	}

	*to = '\0';

	path->size = to - path->ptr;

	return 0;
}

int git_path_apply_relative(git_buf *target, const char *relpath)
{
830 831
	return git_buf_joinpath(target, git_buf_cstr(target), relpath) ||
	    git_path_resolve_relative(target, 0);
832 833
}

834 835
int git_path_cmp(
	const char *name1, size_t len1, int isdir1,
836 837
	const char *name2, size_t len2, int isdir2,
	int (*compare)(const char *, const char *, size_t))
838
{
839
	unsigned char c1, c2;
840
	size_t len = len1 < len2 ? len1 : len2;
841 842
	int cmp;

843
	cmp = compare(name1, name2, len);
844 845 846 847 848 849 850 851 852 853 854 855 856 857 858
	if (cmp)
		return cmp;

	c1 = name1[len];
	c2 = name2[len];

	if (c1 == '\0' && isdir1)
		c1 = '/';

	if (c2 == '\0' && isdir2)
		c2 = '/';

	return (c1 < c2) ? -1 : (c1 > c2) ? 1 : 0;
}

859 860 861 862 863 864 865 866 867 868 869 870 871 872
size_t git_path_common_dirlen(const char *one, const char *two)
{
	const char *p, *q, *dirsep = NULL;

	for (p = one, q = two; *p && *q; p++, q++) {
		if (*p == '/' && *q == '/')
			dirsep = p;
		else if (*p != *q)
			break;
	}

	return dirsep ? (dirsep - one) + 1 : 0;
}

873 874 875
int git_path_make_relative(git_buf *path, const char *parent)
{
	const char *p, *q, *p_dirsep, *q_dirsep;
876
	size_t plen = path->size, newlen, alloclen, depth = 1, i, offset;
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913

	for (p_dirsep = p = path->ptr, q_dirsep = q = parent; *p && *q; p++, q++) {
		if (*p == '/' && *q == '/') {
			p_dirsep = p;
			q_dirsep = q;
		}
		else if (*p != *q)
			break;
	}

	/* need at least 1 common path segment */
	if ((p_dirsep == path->ptr || q_dirsep == parent) &&
		(*p_dirsep != '/' || *q_dirsep != '/')) {
		giterr_set(GITERR_INVALID,
			"%s is not a parent of %s", parent, path->ptr);
		return GIT_ENOTFOUND;
	}

	if (*p == '/' && !*q)
		p++;
	else if (!*p && *q == '/')
		q++;
	else if (!*p && !*q)
		return git_buf_clear(path), 0;
	else {
		p = p_dirsep + 1;
		q = q_dirsep + 1;
	}

	plen -= (p - path->ptr);

	if (!*q)
		return git_buf_set(path, p, plen);

	for (; (q = strchr(q, '/')) && *(q + 1); q++)
		depth++;

914 915 916 917
	GITERR_CHECK_ALLOC_MULTIPLY(&newlen, depth, 3);
	GITERR_CHECK_ALLOC_ADD(&newlen, newlen, plen);

	GITERR_CHECK_ALLOC_ADD(&alloclen, newlen, 1);
918

Erdur committed
919 920
	/* save the offset as we might realllocate the pointer */
	offset = p - path->ptr;
921
	if (git_buf_try_grow(path, alloclen, 1) < 0)
922
		return -1;
Erdur committed
923
	p = path->ptr + offset;
924 925 926 927 928 929 930 931 932 933

	memmove(path->ptr + (depth * 3), p, plen + 1);

	for (i = 0; i < depth; i++)
		memcpy(path->ptr + (i * 3), "../", 3);

	path->size = newlen;
	return 0;
}

934
bool git_path_has_non_ascii(const char *path, size_t pathlen)
935 936 937 938 939 940 941 942 943 944
{
	const uint8_t *scan = (const uint8_t *)path, *end;

	for (end = scan + pathlen; scan < end; ++scan)
		if (*scan & 0x80)
			return true;

	return false;
}

945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962
#ifdef GIT_USE_ICONV

int git_path_iconv_init_precompose(git_path_iconv_t *ic)
{
	git_buf_init(&ic->buf, 0);
	ic->map = iconv_open(GIT_PATH_REPO_ENCODING, GIT_PATH_NATIVE_ENCODING);
	return 0;
}

void git_path_iconv_clear(git_path_iconv_t *ic)
{
	if (ic) {
		if (ic->map != (iconv_t)-1)
			iconv_close(ic->map);
		git_buf_free(&ic->buf);
	}
}

963
int git_path_iconv(git_path_iconv_t *ic, const char **in, size_t *inlen)
964
{
965
	char *nfd = (char*)*in, *nfc;
966
	size_t nfdlen = *inlen, nfclen, wantlen = nfdlen, alloclen, rv;
967 968
	int retry = 1;

969 970
	if (!ic || ic->map == (iconv_t)-1 ||
		!git_path_has_non_ascii(*in, *inlen))
971 972
		return 0;

Russell Belfer committed
973
	git_buf_clear(&ic->buf);
974

975
	while (1) {
976 977
		GITERR_CHECK_ALLOC_ADD(&alloclen, wantlen, 1);
		if (git_buf_grow(&ic->buf, alloclen) < 0)
978 979
			return -1;

980 981
		nfc    = ic->buf.ptr   + ic->buf.size;
		nfclen = ic->buf.asize - ic->buf.size;
982

983
		rv = iconv(ic->map, &nfd, &nfdlen, &nfc, &nfclen);
984

985
		ic->buf.size = (nfc - ic->buf.ptr);
986 987 988 989

		if (rv != (size_t)-1)
			break;

990 991 992
		/* if we cannot convert the data (probably because iconv thinks
		 * it is not valid UTF-8 source data), then use original data
		 */
993
		if (errno != E2BIG)
994
			return 0;
995 996 997 998

		/* make space for 2x the remaining data to be converted
		 * (with per retry overhead to avoid infinite loops)
		 */
999
		wantlen = ic->buf.size + max(nfclen, nfdlen) * 2 + (size_t)(retry * 4);
1000 1001

		if (retry++ > 4)
1002
			goto fail;
1003 1004
	}

1005
	ic->buf.ptr[ic->buf.size] = '\0';
1006

1007 1008
	*in    = ic->buf.ptr;
	*inlen = ic->buf.size;
1009 1010

	return 0;
1011 1012

fail:
1013
	giterr_set(GITERR_OS, "unable to convert unicode path data");
1014
	return -1;
1015
}
1016

1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074
static const char *nfc_file = "\xC3\x85\x73\x74\x72\xC3\xB6\x6D.XXXXXX";
static const char *nfd_file = "\x41\xCC\x8A\x73\x74\x72\x6F\xCC\x88\x6D.XXXXXX";

/* Check if the platform is decomposing unicode data for us.  We will
 * emulate core Git and prefer to use precomposed unicode data internally
 * on these platforms, composing the decomposed unicode on the fly.
 *
 * This mainly happens on the Mac where HDFS stores filenames as
 * decomposed unicode.  Even on VFAT and SAMBA file systems, the Mac will
 * return decomposed unicode from readdir() even when the actual
 * filesystem is storing precomposed unicode.
 */
bool git_path_does_fs_decompose_unicode(const char *root)
{
	git_buf path = GIT_BUF_INIT;
	int fd;
	bool found_decomposed = false;
	char tmp[6];

	/* Create a file using a precomposed path and then try to find it
	 * using the decomposed name.  If the lookup fails, then we will mark
	 * that we should precompose unicode for this repository.
	 */
	if (git_buf_joinpath(&path, root, nfc_file) < 0 ||
		(fd = p_mkstemp(path.ptr)) < 0)
		goto done;
	p_close(fd);

	/* record trailing digits generated by mkstemp */
	memcpy(tmp, path.ptr + path.size - sizeof(tmp), sizeof(tmp));

	/* try to look up as NFD path */
	if (git_buf_joinpath(&path, root, nfd_file) < 0)
		goto done;
	memcpy(path.ptr + path.size - sizeof(tmp), tmp, sizeof(tmp));

	found_decomposed = git_path_exists(path.ptr);

	/* remove temporary file (using original precomposed path) */
	if (git_buf_joinpath(&path, root, nfc_file) < 0)
		goto done;
	memcpy(path.ptr + path.size - sizeof(tmp), tmp, sizeof(tmp));

	(void)p_unlink(path.ptr);

done:
	git_buf_free(&path);
	return found_decomposed;
}

#else

bool git_path_does_fs_decompose_unicode(const char *root)
{
	GIT_UNUSED(root);
	return false;
}

1075 1076 1077 1078 1079 1080 1081 1082
#endif

#if defined(__sun) || defined(__GNU__)
typedef char path_dirent_data[sizeof(struct dirent) + FILENAME_MAX + 1];
#else
typedef struct dirent path_dirent_data;
#endif

1083 1084
int git_path_direach(
	git_buf *path,
1085
	uint32_t flags,
1086 1087 1088
	int (*fn)(void *, git_buf *),
	void *arg)
{
1089
	int error = 0;
1090 1091
	ssize_t wd_len;
	DIR *dir;
1092
	struct dirent *de;
1093 1094

#ifdef GIT_USE_ICONV
1095
	git_path_iconv_t ic = GIT_PATH_ICONV_INIT;
1096
#endif
1097

1098 1099
	GIT_UNUSED(flags);

1100
	if (git_path_to_dir(path) < 0)
1101
		return -1;
1102

nulltoken committed
1103
	wd_len = git_buf_len(path);
1104

1105
	if ((dir = opendir(path->ptr)) == NULL) {
1106
		giterr_set(GITERR_OS, "failed to open directory '%s'", path->ptr);
1107 1108 1109
		if (errno == ENOENT)
			return GIT_ENOTFOUND;

1110 1111
		return -1;
	}
1112

1113
#ifdef GIT_USE_ICONV
1114
	if ((flags & GIT_PATH_DIR_PRECOMPOSE_UNICODE) != 0)
1115
		(void)git_path_iconv_init_precompose(&ic);
1116
#endif
1117

1118
	while ((de = readdir(dir)) != NULL) {
1119
		const char *de_path = de->d_name;
1120
		size_t de_len = strlen(de_path);
1121

1122
		if (git_path_is_dot_or_dotdot(de_path))
1123 1124
			continue;

1125 1126 1127 1128
#ifdef GIT_USE_ICONV
		if ((error = git_path_iconv(&ic, &de_path, &de_len)) < 0)
			break;
#endif
1129

1130
		if ((error = git_buf_put(path, de_path, de_len)) < 0)
1131 1132
			break;

1133
		giterr_clear();
1134
		error = fn(arg, path);
1135 1136 1137

		git_buf_truncate(path, wd_len); /* restore path */

1138
		/* Only set our own error if the callback did not set one already */
1139 1140 1141 1142
		if (error != 0) {
			if (!giterr_last())
				giterr_set_after_callback(error);

1143
			break;
1144
		}
1145 1146 1147
	}

	closedir(dir);
1148 1149

#ifdef GIT_USE_ICONV
1150
	git_path_iconv_clear(&ic);
1151
#endif
1152 1153

	return error;
1154
}
1155

1156 1157 1158
#if defined(GIT_WIN32) && !defined(__MINGW32__)

/* Using _FIND_FIRST_EX_LARGE_FETCH may increase performance in Windows 7
1159
 * and better.
1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171
 */
#ifndef FIND_FIRST_EX_LARGE_FETCH
# define FIND_FIRST_EX_LARGE_FETCH 2
#endif

int git_path_diriter_init(
	git_path_diriter *diriter,
	const char *path,
	unsigned int flags)
{
	git_win32_path path_filter;

1172 1173 1174 1175
	static int is_win7_or_later = -1;
	if (is_win7_or_later < 0)
		is_win7_or_later = git_has_win32_version(6, 1, 0);

1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186
	assert(diriter && path);

	memset(diriter, 0, sizeof(git_path_diriter));
	diriter->handle = INVALID_HANDLE_VALUE;

	if (git_buf_puts(&diriter->path_utf8, path) < 0)
		return -1;

	git_path_trim_slashes(&diriter->path_utf8);

	if (diriter->path_utf8.size == 0) {
1187
		giterr_set(GITERR_FILESYSTEM, "could not open directory '%s'", path);
1188 1189 1190 1191 1192
		return -1;
	}

	if ((diriter->parent_len = git_win32_path_from_utf8(diriter->path, diriter->path_utf8.ptr)) < 0 ||
			!git_win32__findfirstfile_filter(path_filter, diriter->path_utf8.ptr)) {
1193
		giterr_set(GITERR_OS, "could not parse the directory path '%s'", path);
1194 1195 1196 1197 1198
		return -1;
	}

	diriter->handle = FindFirstFileExW(
		path_filter,
1199
		is_win7_or_later ? FindExInfoBasic : FindExInfoStandard,
1200 1201 1202
		&diriter->current,
		FindExSearchNameMatch,
		NULL,
1203
		is_win7_or_later ? FIND_FIRST_EX_LARGE_FETCH : 0);
1204 1205

	if (diriter->handle == INVALID_HANDLE_VALUE) {
1206
		giterr_set(GITERR_OS, "could not open directory '%s'", path);
1207 1208 1209 1210 1211 1212 1213 1214
		return -1;
	}

	diriter->parent_utf8_len = diriter->path_utf8.size;
	diriter->flags = flags;
	return 0;
}

1215
static int diriter_update_paths(git_path_diriter *diriter)
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237
{
	size_t filename_len, path_len;

	filename_len = wcslen(diriter->current.cFileName);

	if (GIT_ADD_SIZET_OVERFLOW(&path_len, diriter->parent_len, filename_len) ||
		GIT_ADD_SIZET_OVERFLOW(&path_len, path_len, 2))
		return -1;

	if (path_len > GIT_WIN_PATH_UTF16) {
		giterr_set(GITERR_FILESYSTEM,
			"invalid path '%.*ls\\%ls' (path too long)",
			diriter->parent_len, diriter->path, diriter->current.cFileName);
		return -1;
	}

	diriter->path[diriter->parent_len] = L'\\';
	memcpy(&diriter->path[diriter->parent_len+1],
		diriter->current.cFileName, filename_len * sizeof(wchar_t));
	diriter->path[path_len-1] = L'\0';

	git_buf_truncate(&diriter->path_utf8, diriter->parent_utf8_len);
1238 1239 1240 1241 1242

	if (diriter->parent_utf8_len > 0 &&
		diriter->path_utf8.ptr[diriter->parent_utf8_len-1] != '/')
		git_buf_putc(&diriter->path_utf8, '/');

1243
	git_buf_put_w(&diriter->path_utf8, diriter->current.cFileName, filename_len);
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 1254 1255 1256 1257 1258 1259 1260 1261 1262 1263 1264

	if (git_buf_oom(&diriter->path_utf8))
		return -1;

	return 0;
}

int git_path_diriter_next(git_path_diriter *diriter)
{
	bool skip_dot = !(diriter->flags & GIT_PATH_DIR_INCLUDE_DOT_AND_DOTDOT);

	do {
		/* Our first time through, we already have the data from
		 * FindFirstFileW.  Use it, otherwise get the next file.
		 */
		if (!diriter->needs_next)
			diriter->needs_next = 1;
		else if (!FindNextFileW(diriter->handle, &diriter->current))
			return GIT_ITEROVER;
	} while (skip_dot && git_path_is_dot_or_dotdotW(diriter->current.cFileName));

1265
	if (diriter_update_paths(diriter) < 0)
1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310
		return -1;

	return 0;
}

int git_path_diriter_filename(
	const char **out,
	size_t *out_len,
	git_path_diriter *diriter)
{
	assert(out && out_len && diriter);

	assert(diriter->path_utf8.size > diriter->parent_utf8_len);

	*out = &diriter->path_utf8.ptr[diriter->parent_utf8_len+1];
	*out_len = diriter->path_utf8.size - diriter->parent_utf8_len - 1;
	return 0;
}

int git_path_diriter_fullpath(
	const char **out,
	size_t *out_len,
	git_path_diriter *diriter)
{
	assert(out && out_len && diriter);

	*out = diriter->path_utf8.ptr;
	*out_len = diriter->path_utf8.size;
	return 0;
}

int git_path_diriter_stat(struct stat *out, git_path_diriter *diriter)
{
	assert(out && diriter);

	return git_win32__file_attribute_to_stat(out,
		(WIN32_FILE_ATTRIBUTE_DATA *)&diriter->current,
		diriter->path);
}

void git_path_diriter_free(git_path_diriter *diriter)
{
	if (diriter == NULL)
		return;

1311 1312
	git_buf_free(&diriter->path_utf8);

1313 1314 1315 1316 1317 1318 1319 1320
	if (diriter->handle != INVALID_HANDLE_VALUE) {
		FindClose(diriter->handle);
		diriter->handle = INVALID_HANDLE_VALUE;
	}
}

#else

1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334
int git_path_diriter_init(
	git_path_diriter *diriter,
	const char *path,
	unsigned int flags)
{
	assert(diriter && path);

	memset(diriter, 0, sizeof(git_path_diriter));

	if (git_buf_puts(&diriter->path, path) < 0)
		return -1;

	git_path_trim_slashes(&diriter->path);

1335
	if (diriter->path.size == 0) {
1336
		giterr_set(GITERR_FILESYSTEM, "could not open directory '%s'", path);
1337 1338 1339
		return -1;
	}

1340 1341 1342
	if ((diriter->dir = opendir(diriter->path.ptr)) == NULL) {
		git_buf_free(&diriter->path);

1343
		giterr_set(GITERR_OS, "failed to open directory '%s'", path);
1344 1345 1346 1347 1348
		return -1;
	}

#ifdef GIT_USE_ICONV
	if ((flags & GIT_PATH_DIR_PRECOMPOSE_UNICODE) != 0)
1349
		(void)git_path_iconv_init_precompose(&diriter->ic);
1350 1351 1352 1353 1354 1355 1356 1357
#endif

	diriter->parent_len = diriter->path.size;
	diriter->flags = flags;

	return 0;
}

1358
int git_path_diriter_next(git_path_diriter *diriter)
1359 1360 1361 1362 1363 1364 1365
{
	struct dirent *de;
	const char *filename;
	size_t filename_len;
	bool skip_dot = !(diriter->flags & GIT_PATH_DIR_INCLUDE_DOT_AND_DOTDOT);
	int error = 0;

1366
	assert(diriter);
1367 1368 1369 1370 1371 1372 1373 1374 1375

	errno = 0;

	do {
		if ((de = readdir(diriter->dir)) == NULL) {
			if (!errno)
				return GIT_ITEROVER;

			giterr_set(GITERR_OS,
1376
				"could not read directory '%s'", diriter->path.ptr);
1377 1378 1379 1380 1381 1382 1383 1384
			return -1;
		}
	} while (skip_dot && git_path_is_dot_or_dotdot(de->d_name));

	filename = de->d_name;
	filename_len = strlen(filename);

#ifdef GIT_USE_ICONV
1385
	if ((diriter->flags & GIT_PATH_DIR_PRECOMPOSE_UNICODE) != 0 &&
1386
		(error = git_path_iconv(&diriter->ic, &filename, &filename_len)) < 0)
1387 1388 1389 1390
		return error;
#endif

	git_buf_truncate(&diriter->path, diriter->parent_len);
1391 1392 1393 1394 1395

	if (diriter->parent_len > 0 &&
		diriter->path.ptr[diriter->parent_len-1] != '/')
		git_buf_putc(&diriter->path, '/');

1396 1397 1398 1399 1400 1401 1402 1403
	git_buf_put(&diriter->path, filename, filename_len);

	if (git_buf_oom(&diriter->path))
		return -1;

	return error;
}

1404 1405 1406 1407 1408 1409 1410
int git_path_diriter_filename(
	const char **out,
	size_t *out_len,
	git_path_diriter *diriter)
{
	assert(out && out_len && diriter);

1411 1412
	assert(diriter->path.size > diriter->parent_len);

1413 1414 1415 1416 1417
	*out = &diriter->path.ptr[diriter->parent_len+1];
	*out_len = diriter->path.size - diriter->parent_len - 1;
	return 0;
}

1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441
int git_path_diriter_fullpath(
	const char **out,
	size_t *out_len,
	git_path_diriter *diriter)
{
	assert(out && out_len && diriter);

	*out = diriter->path.ptr;
	*out_len = diriter->path.size;
	return 0;
}

int git_path_diriter_stat(struct stat *out, git_path_diriter *diriter)
{
	assert(out && diriter);

	return git_path_lstat(diriter->path.ptr, out);
}

void git_path_diriter_free(git_path_diriter *diriter)
{
	if (diriter == NULL)
		return;

1442 1443 1444 1445
	if (diriter->dir) {
		closedir(diriter->dir);
		diriter->dir = NULL;
	}
1446 1447 1448 1449 1450 1451 1452 1453

#ifdef GIT_USE_ICONV
	git_path_iconv_clear(&diriter->ic);
#endif

	git_buf_free(&diriter->path);
}

1454 1455
#endif

1456 1457 1458 1459
int git_path_dirload(
	git_vector *contents,
	const char *path,
	size_t prefix_len,
1460
	uint32_t flags)
1461
{
1462
	git_path_diriter iter = GIT_PATH_DIRITER_INIT;
1463 1464 1465 1466 1467 1468 1469 1470 1471 1472
	const char *name;
	size_t name_len;
	char *dup;
	int error;

	assert(contents && path);

	if ((error = git_path_diriter_init(&iter, path, flags)) < 0)
		return error;

1473
	while ((error = git_path_diriter_next(&iter)) == 0) {
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
		if ((error = git_path_diriter_fullpath(&name, &name_len, &iter)) < 0)
			break;

		assert(name_len > prefix_len);

		dup = git__strndup(name + prefix_len, name_len - prefix_len);
		GITERR_CHECK_ALLOC(dup);

		if ((error = git_vector_insert(contents, dup)) < 0)
			break;
	}

	if (error == GIT_ITEROVER)
		error = 0;

	git_path_diriter_free(&iter);
	return error;
}

1493 1494
int git_path_from_url_or_path(git_buf *local_path_out, const char *url_or_path)
{
1495 1496 1497 1498
	if (git_path_is_local_file_url(url_or_path))
		return git_path_fromurl(local_path_out, url_or_path);
	else
		return git_buf_sets(local_path_out, url_or_path);
1499
}
1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514

/* Reject paths like AUX or COM1, or those versions that end in a dot or
 * colon.  ("AUX." or "AUX:")
 */
GIT_INLINE(bool) verify_dospath(
	const char *component,
	size_t len,
	const char dospath[3],
	bool trailing_num)
{
	size_t last = trailing_num ? 4 : 3;

	if (len < last || git__strncasecmp(component, dospath, 3) != 0)
		return true;

1515
	if (trailing_num && (component[3] < '1' || component[3] > '9'))
1516 1517 1518 1519 1520 1521 1522
		return true;

	return (len > last &&
		component[last] != '.' &&
		component[last] != ':');
}

1523
static int32_t next_hfs_char(const char **in, size_t *len)
1524
{
1525 1526 1527 1528 1529
	while (*len) {
		int32_t codepoint;
		int cp_len = git__utf8_iterate((const uint8_t *)(*in), (int)(*len), &codepoint);
		if (cp_len < 0)
			return -1;
1530

1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552
		(*in) += cp_len;
		(*len) -= cp_len;

		/* these code points are ignored completely */
		switch (codepoint) {
		case 0x200c: /* ZERO WIDTH NON-JOINER */
		case 0x200d: /* ZERO WIDTH JOINER */
		case 0x200e: /* LEFT-TO-RIGHT MARK */
		case 0x200f: /* RIGHT-TO-LEFT MARK */
		case 0x202a: /* LEFT-TO-RIGHT EMBEDDING */
		case 0x202b: /* RIGHT-TO-LEFT EMBEDDING */
		case 0x202c: /* POP DIRECTIONAL FORMATTING */
		case 0x202d: /* LEFT-TO-RIGHT OVERRIDE */
		case 0x202e: /* RIGHT-TO-LEFT OVERRIDE */
		case 0x206a: /* INHIBIT SYMMETRIC SWAPPING */
		case 0x206b: /* ACTIVATE SYMMETRIC SWAPPING */
		case 0x206c: /* INHIBIT ARABIC FORM SHAPING */
		case 0x206d: /* ACTIVATE ARABIC FORM SHAPING */
		case 0x206e: /* NATIONAL DIGIT SHAPES */
		case 0x206f: /* NOMINAL DIGIT SHAPES */
		case 0xfeff: /* ZERO WIDTH NO-BREAK SPACE */
			continue;
1553 1554
		}

1555 1556 1557 1558
		/* fold into lowercase -- this will only fold characters in
		 * the ASCII range, which is perfectly fine, because the
		 * git folder name can only be composed of ascii characters
		 */
1559
		return git__tolower(codepoint);
1560
	}
1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571
	return 0; /* NULL byte -- end of string */
}

static bool verify_dotgit_hfs(const char *path, size_t len)
{
	if (next_hfs_char(&path, &len) != '.' ||
		next_hfs_char(&path, &len) != 'g' ||
		next_hfs_char(&path, &len) != 'i' ||
		next_hfs_char(&path, &len) != 't' ||
		next_hfs_char(&path, &len) != 0)
		return true;
1572

1573
	return false;
1574 1575
}

1576 1577
GIT_INLINE(bool) verify_dotgit_ntfs(git_repository *repo, const char *path, size_t len)
{
1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595
	git_buf *reserved = git_repository__reserved_names_win32;
	size_t reserved_len = git_repository__reserved_names_win32_len;
	size_t start = 0, i;

	if (repo)
		git_repository__reserved_names(&reserved, &reserved_len, repo, true);

	for (i = 0; i < reserved_len; i++) {
		git_buf *r = &reserved[i];

		if (len >= r->size &&
			strncasecmp(path, r->ptr, r->size) == 0) {
			start = r->size;
			break;
		}
	}

	if (!start)
1596 1597
		return true;

1598
	/* Reject paths like ".git\" */
1599 1600 1601
	if (path[start] == '\\')
		return false;

1602
	/* Reject paths like '.git ' or '.git.' */
1603 1604 1605 1606 1607 1608 1609 1610
	for (i = start; i < len; i++) {
		if (path[i] != ' ' && path[i] != '.')
			return true;
	}

	return false;
}

1611 1612 1613 1614 1615
GIT_INLINE(bool) verify_char(unsigned char c, unsigned int flags)
{
	if ((flags & GIT_PATH_REJECT_BACKSLASH) && c == '\\')
		return false;

1616 1617 1618
	if ((flags & GIT_PATH_REJECT_SLASH) && c == '/')
		return false;

1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682
	if (flags & GIT_PATH_REJECT_NT_CHARS) {
		if (c < 32)
			return false;

		switch (c) {
		case '<':
		case '>':
		case ':':
		case '"':
		case '|':
		case '?':
		case '*':
			return false;
		}
	}

	return true;
}

/*
 * We fundamentally don't like some paths when dealing with user-inputted
 * strings (in checkout or ref names): we don't want dot or dot-dot
 * anywhere, we want to avoid writing weird paths on Windows that can't
 * be handled by tools that use the non-\\?\ APIs, we don't want slashes
 * or double slashes at the end of paths that can make them ambiguous.
 *
 * For checkout, we don't want to recurse into ".git" either.
 */
static bool verify_component(
	git_repository *repo,
	const char *component,
	size_t len,
	unsigned int flags)
{
	if (len == 0)
		return false;

	if ((flags & GIT_PATH_REJECT_TRAVERSAL) &&
		len == 1 && component[0] == '.')
		return false;

	if ((flags & GIT_PATH_REJECT_TRAVERSAL) &&
		len == 2 && component[0] == '.' && component[1] == '.')
		return false;

	if ((flags & GIT_PATH_REJECT_TRAILING_DOT) && component[len-1] == '.')
		return false;

	if ((flags & GIT_PATH_REJECT_TRAILING_SPACE) && component[len-1] == ' ')
		return false;

	if ((flags & GIT_PATH_REJECT_TRAILING_COLON) && component[len-1] == ':')
		return false;

	if (flags & GIT_PATH_REJECT_DOS_PATHS) {
		if (!verify_dospath(component, len, "CON", false) ||
			!verify_dospath(component, len, "PRN", false) ||
			!verify_dospath(component, len, "AUX", false) ||
			!verify_dospath(component, len, "NUL", false) ||
			!verify_dospath(component, len, "COM", true)  ||
			!verify_dospath(component, len, "LPT", true))
			return false;
	}

1683 1684 1685 1686
	if (flags & GIT_PATH_REJECT_DOT_GIT_HFS &&
		!verify_dotgit_hfs(component, len))
		return false;

1687 1688 1689 1690
	if (flags & GIT_PATH_REJECT_DOT_GIT_NTFS &&
		!verify_dotgit_ntfs(repo, component, len))
		return false;

1691 1692 1693
	/* don't bother rerunning the `.git` test if we ran the HFS or NTFS
	 * specific tests, they would have already rejected `.git`.
	 */
1694 1695
	if ((flags & GIT_PATH_REJECT_DOT_GIT_HFS) == 0 &&
		(flags & GIT_PATH_REJECT_DOT_GIT_NTFS) == 0 &&
1696
		(flags & GIT_PATH_REJECT_DOT_GIT_LITERAL) &&
1697 1698 1699 1700 1701 1702 1703
		len == 4 &&
		component[0] == '.' &&
		(component[1] == 'g' || component[1] == 'G') &&
		(component[2] == 'i' || component[2] == 'I') &&
		(component[3] == 't' || component[3] == 'T'))
		return false;

1704 1705 1706
	return true;
}

1707 1708 1709 1710 1711
GIT_INLINE(unsigned int) dotgit_flags(
	git_repository *repo,
	unsigned int flags)
{
	int protectHFS = 0, protectNTFS = 0;
1712
	int error = 0;
1713

1714 1715
	flags |= GIT_PATH_REJECT_DOT_GIT_LITERAL;

1716 1717 1718 1719 1720 1721 1722 1723 1724
#ifdef __APPLE__
	protectHFS = 1;
#endif

#ifdef GIT_WIN32
	protectNTFS = 1;
#endif

	if (repo && !protectHFS)
1725 1726
		error = git_repository__cvar(&protectHFS, repo, GIT_CVAR_PROTECTHFS);
	if (!error && protectHFS)
1727 1728 1729
		flags |= GIT_PATH_REJECT_DOT_GIT_HFS;

	if (repo && !protectNTFS)
1730 1731
		error = git_repository__cvar(&protectNTFS, repo, GIT_CVAR_PROTECTNTFS);
	if (!error && protectNTFS)
1732 1733 1734 1735 1736
		flags |= GIT_PATH_REJECT_DOT_GIT_NTFS;

	return flags;
}

1737 1738 1739 1740 1741 1742 1743
bool git_path_isvalid(
	git_repository *repo,
	const char *path,
	unsigned int flags)
{
	const char *start, *c;

1744 1745 1746 1747
	/* Upgrade the ".git" checks based on platform */
	if ((flags & GIT_PATH_REJECT_DOT_GIT))
		flags = dotgit_flags(repo, flags);

1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761
	for (start = c = path; *c; c++) {
		if (!verify_char(*c, flags))
			return false;

		if (*c == '/') {
			if (!verify_component(repo, start, (c - start), flags))
				return false;

			start = c+1;
		}
	}

	return verify_component(repo, start, (c - start), flags);
}
1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777

int git_path_normalize_slashes(git_buf *out, const char *path)
{
	int error;
	char *p;

	if ((error = git_buf_puts(out, path)) < 0)
		return error;

	for (p = out->ptr; *p; p++) {
		if (*p == '\\')
			*p = '/';
	}

	return 0;
}