/* Copyright (c) 2013-2015 Jeffrey Pfau
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "vfs.h"

ssize_t VFileReadline(struct VFile* vf, char* buffer, size_t size) {
	size_t bytesRead = 0;
	while (bytesRead < size - 1) {
		size_t newRead = vf->read(vf, &buffer[bytesRead], 1);
		bytesRead += newRead;
		if (!newRead || buffer[bytesRead] == '\n') {
			break;
		}
	}
	return buffer[bytesRead] = '\0';
}

struct VFile* VDirOptionalOpenFile(struct VDir* dir, const char* realPath, const char* prefix, const char* suffix, int mode) {
	char path[PATH_MAX];
	path[PATH_MAX - 1] = '\0';
	struct VFile* vf;
	if (!dir) {
		if (!realPath) {
			return 0;
		}
		char* dotPoint = strrchr(realPath, '.');
		if (dotPoint - realPath + 1 >= PATH_MAX - 1) {
			return 0;
		}
		if (dotPoint > strrchr(realPath, '/')) {
			int len = dotPoint - realPath;
			strncpy(path, realPath, len);
			path[len] = 0;
			strncat(path + len, suffix, PATH_MAX - len - 1);
		} else {
			snprintf(path, PATH_MAX - 1, "%s%s", realPath, suffix);
		}
		vf = VFileOpen(path, mode);
	} else {
		snprintf(path, PATH_MAX - 1, "%s%s", prefix, suffix);
		vf = dir->openFile(dir, path, mode);
	}
	return vf;
}