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/* Utility functions for decompression helpers
*
* Copyright (c) 2009 Hans de Goede <hdegoede@redhat.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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 AUTHOR 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 AUTHOR 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 <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
static int v4lconvert_helper_write(int fd, const void *b, size_t count,
char *progname)
{
const unsigned char *buf = b;
size_t ret, written = 0;
while (written < count) {
ret = write(fd, buf + written, count - written);
if (ret == -1) {
if (errno == EINTR)
continue;
if (errno == EPIPE) /* Main program has quited */
exit(0);
fprintf(stderr, "%s: error writing: %s\n", progname, strerror(errno));
return -1;
}
written += ret;
}
return 0;
}
static int v4lconvert_helper_read(int fd, void *b, size_t count,
char *progname)
{
unsigned char *buf = b;
size_t ret, r = 0;
while (r < count) {
ret = read(fd, buf + r, count - r);
if (ret == -1) {
if (errno == EINTR)
continue;
fprintf(stderr, "%s: error reading: %s\n", progname, strerror(errno));
return -1;
}
if (ret == 0) /* EOF */
exit(0);
r += ret;
}
return 0;
}
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