scummvm/engines/ags/shared/util/misc.cpp

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

/*
  Copyright (c) 2003, Shawn R. Walker
  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.
      * Neither the name of Shawn R. Walker nor names of contributors
        may be used to endorse or promote products derived from this software
        without specific prior written permission.

  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.
*/

#include "ags/shared/core/platform.h"

//include <stdio.h>
//include <sys/types.h>
//include <sys/stat.h>
//include <string.h>
#if !AGS_PLATFORM_OS_WINDOWS
//include <dirent.h>
#endif

#include "ags/lib/allegro.h"
#include "ags/shared/util/file.h"
#include "ags/shared/util/stream.h"

namespace AGS3 {

using namespace AGS::Shared;

#if !defined (AGS_CASE_SENSITIVE_FILESYSTEM)
/* File Name Concatenator basically on Windows / DOS */
char *ci_find_file(const char *dir_name, const char *file_name) {
	char *diamond = NULL;

	if (dir_name == NULL && file_name == NULL)
		return NULL;

	if (dir_name == NULL) {
		diamond = (char *)malloc(strlen(file_name) + 3);
		strcpy(diamond, file_name);
	} else {
		diamond = (char *)malloc(strlen(dir_name) + strlen(file_name) + 2);
		append_filename(diamond, dir_name, file_name, strlen(dir_name) + strlen(file_name) + 2);
	}
	fix_filename_case(diamond);
	fix_filename_slashes(diamond);
	return diamond;
}

#else
/* Case Insensitive File Find */
char *ci_find_file(const char *dir_name, const char *file_name) {
	struct stat   statbuf;
	struct dirent *entry = nullptr;
	DIR *rough = nullptr;
	DIR *prevdir = nullptr;
	char *diamond = nullptr;
	char *directory = nullptr;
	char *filename = nullptr;

	if (dir_name == nullptr && file_name == nullptr)
		return nullptr;

	if (dir_name != nullptr) {
		directory = (char *)malloc(strlen(dir_name) + 1);
		strcpy(directory, dir_name);

		fix_filename_case(directory);
		fix_filename_slashes(directory);
	}

	if (file_name != nullptr) {
		filename = (char *)malloc(strlen(file_name) + 1);
		strcpy(filename, file_name);

		fix_filename_case(filename);
		fix_filename_slashes(filename);
	}

	if (directory == nullptr) {
		char *match = nullptr;
		int   match_len = 0;
		int   dir_len = 0;

		match = get_filename(filename);
		if (match == nullptr)
			return nullptr;

		match_len = strlen(match);
		dir_len = (match - filename);

		if (dir_len == 0) {
			directory = (char *)malloc(2);
			strcpy(directory, ".");
		} else {
			directory = (char *)malloc(dir_len + 1);
			strncpy(directory, file_name, dir_len);
			directory[dir_len] = '\0';
		}

		filename = (char *)malloc(match_len + 1);
		strncpy(filename, match, match_len);
		filename[match_len] = '\0';
	}

	if ((prevdir = opendir(".")) == nullptr) {
		fprintf(stderr, "ci_find_file: cannot open current working directory\n");
		return nullptr;
	}

	if (chdir(directory) == -1) {
		fprintf(stderr, "ci_find_file: cannot change to directory: %s\n", directory);
		return nullptr;
	}

	if ((rough = opendir(directory)) == nullptr) {
		fprintf(stderr, "ci_find_file: cannot open directory: %s\n", directory);
		return nullptr;
	}

	while ((entry = readdir(rough)) != nullptr) {
		lstat(entry->d_name, &statbuf);
		if (S_ISREG(statbuf.st_mode) || S_ISLNK(statbuf.st_mode)) {
			if (strcasecmp(filename, entry->d_name) == 0) {
#if AGS_PLATFORM_DEBUG
				fprintf(stderr, "ci_find_file: Looked for %s in rough %s, found diamond %s.\n", filename, directory, entry->d_name);
#endif // AGS_PLATFORM_DEBUG
				diamond = (char *)malloc(strlen(directory) + strlen(entry->d_name) + 2);
				append_filename(diamond, directory, entry->d_name, strlen(directory) + strlen(entry->d_name) + 2);
				break;
			}
		}
	}
	closedir(rough);

	fchdir(dirfd(prevdir));
	closedir(prevdir);

	free(directory);
	free(filename);

	return diamond;
}
#endif


/* Case Insensitive fopen */
Stream *ci_fopen(const char *file_name, FileOpenMode open_mode, FileWorkMode work_mode) {
#if !defined (AGS_CASE_SENSITIVE_FILESYSTEM)
	return File::OpenFile(file_name, open_mode, work_mode);
#else
	Stream *fs = nullptr;
	char *fullpath = ci_find_file(nullptr, (char *)file_name);

	/* If I didn't find a file, this could be writing a new file,
		so use whatever file_name they passed */
	if (fullpath == nullptr) {
		fs = File::OpenFile(file_name, open_mode, work_mode);
	} else {
		fs = File::OpenFile(fullpath, open_mode, work_mode);
		free(fullpath);
	}

	return fs;
#endif
}

} // namespace AGS3