/*
 * This file is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2,
 * as published by the Free Software Foundation.
 *
 * In addition to the permissions in the GNU General Public License,
 * the authors give you unlimited permission to link the compiled
 * version of this file into combinations with other programs,
 * and to distribute those combinations without any restriction
 * coming from the use of this file.  (The General Public License
 * restrictions do apply in other respects; for example, they cover
 * modification of the file, and distribution when not linked into
 * a combined executable.)
 *
 * 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
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; see the file COPYING.  If not, write to
 * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 */

#include "git/common.h"

int git_fopen(git_file *out, const char *path, int flags)
{
	int r = open(path, flags);
	if (r < 0)
		return -1;
	*out = r;
	return GIT_SUCCESS;
}

int git_fread(git_file fd, void *buf, size_t cnt)
{
	char *b = buf;
	while (cnt) {
		ssize_t r = read(fd, b, cnt);
		if (r < 0) {
			if (errno == EINTR || errno == EAGAIN)
				continue;
			return -1;
		}
		if (!r) {
			errno = EPIPE;
			return -1;
		}
		cnt -= r;
		b += r;
	}
	return GIT_SUCCESS;
}

int git_fwrite(git_file fd, void *buf, size_t cnt)
{
	char *b = buf;
	while (cnt) {
		ssize_t r = write(fd, b, cnt);
		if (r < 0) {
			if (errno == EINTR || errno == EAGAIN)
				continue;
			return -1;
		}
		if (!r) {
			errno = EPIPE;
			return -1;
		}
		cnt -= r;
		b += r;
	}
	return GIT_SUCCESS;
}

off_t git_fsize(git_file fd)
{
	struct stat sb;
	if (fstat(fd, &sb))
		return -1;
	return sb.st_size;
}