/*
# open/close/ioctl/mmap/munmap library call wrapper doing format conversion
# for v4l2 applications which want to be able to simply capture bgr24 / yuv420
# from v4l2 devices with more exotic frame formats.

#             (C) 2008 Hans de Goede <hdegoede@redhat.com>

# This program 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 2.1 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
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA  02110-1335  USA
*/

/* prevent GCC 4.7 inlining error */
#undef _FORTIFY_SOURCE

#include <stdarg.h>
#include <stdlib.h>
#include <fcntl.h>
#include <string.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#if defined(__OpenBSD__)
#include <sys/videoio.h>
#else
#include <linux/videodev2.h>
#endif
#include <libv4l2.h>
#include "../libv4lconvert/libv4lsyscall-priv.h"

/* Check that open/read/mmap is not a define */
#if defined open || defined read || defined mmap
#error open/read/mmap is a prepocessor macro !!
#endif

#if HAVE_VISIBILITY
#define LIBV4L_PUBLIC __attribute__ ((visibility("default")))
#else
#define LIBV4L_PUBLIC
#endif

LIBV4L_PUBLIC int open(const char *file, int oflag, ...)
{
	int fd;
	int v4l_device = 0;

	/* check if we're opening a video4linux2 device */
	if (!strncmp(file, "/dev/video", 10) || !strncmp(file, "/dev/v4l/", 9)) {
		/* Some apps open the device read-only, but we need rw rights as the
		   buffers *MUST* be mapped rw */
		oflag = (oflag & ~O_ACCMODE) | O_RDWR;
		v4l_device = 1;
	}

	/* original open code */
	if (oflag & O_CREAT) {
		va_list ap;
		mode_t mode;

		va_start(ap, oflag);
		mode = va_arg(ap, PROMOTED_MODE_T);

		fd = SYS_OPEN(file, oflag, mode);

		va_end(ap);
	} else {
		fd = SYS_OPEN(file, oflag, 0);
	}
	/* end of original open code */

	if (fd == -1 || !v4l_device)
		return fd;

	/* Try to Register with libv4l2 (in case of failure pass the fd to the
	   application as is) */
	v4l2_fd_open(fd, 0);

	return fd;
}

#if defined(linux) && defined(__GLIBC__)
LIBV4L_PUBLIC int open64(const char *file, int oflag, ...)
{
	int fd;

	/* original open code */
	if (oflag & O_CREAT) {
		va_list ap;
		mode_t mode;

		va_start(ap, oflag);
		mode = va_arg(ap, PROMOTED_MODE_T);

		fd = open(file, oflag | O_LARGEFILE, mode);

		va_end(ap);
	} else {
		fd = open(file, oflag | O_LARGEFILE);
	}
	/* end of original open code */

	return fd;
}
#endif

#ifndef ANDROID
LIBV4L_PUBLIC int close(int fd)
{
	return v4l2_close(fd);
}

LIBV4L_PUBLIC int dup(int fd)
{
	return v4l2_dup(fd);
}

#ifdef HAVE_POSIX_IOCTL
LIBV4L_PUBLIC int ioctl(int fd, int request, ...)
#else
LIBV4L_PUBLIC int ioctl(int fd, unsigned long int request, ...)
#endif
{
	void *arg;
	va_list ap;

	va_start(ap, request);
	arg = va_arg(ap, void *);
	va_end(ap);

	return v4l2_ioctl(fd, request, arg);
}

LIBV4L_PUBLIC ssize_t read(int fd, void *buffer, size_t n)
{
	return v4l2_read(fd, buffer, n);
}

LIBV4L_PUBLIC void *mmap(void *start, size_t length, int prot, int flags, int fd,
		off_t offset)
{
	return v4l2_mmap(start, length, prot, flags, fd, offset);
}

#if defined(linux) && defined(__GLIBC__)
LIBV4L_PUBLIC void *mmap64(void *start, size_t length, int prot, int flags, int fd,
		off64_t offset)
{
	return v4l2_mmap(start, length, prot, flags, fd, offset);
}
#endif

LIBV4L_PUBLIC int munmap(void *start, size_t length)
{
	return v4l2_munmap(start, length);
}
#endif
