1 /* Utility functions for decompression helpers
2 *
3 * Copyright (c) 2009 Hans de Goede <hdegoede@redhat.com>
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <unistd.h>
30 #include <errno.h>
31 #include <string.h>
32
v4lconvert_helper_write(int fd,const void * b,size_t count,char * progname)33 static int v4lconvert_helper_write(int fd, const void *b, size_t count,
34 char *progname)
35 {
36 const unsigned char *buf = b;
37 size_t ret, written = 0;
38
39 while (written < count) {
40 ret = write(fd, buf + written, count - written);
41 if (ret == -1) {
42 if (errno == EINTR)
43 continue;
44
45 if (errno == EPIPE) /* Main program has quited */
46 exit(0);
47
48 fprintf(stderr, "%s: error writing: %s\n", progname, strerror(errno));
49 return -1;
50 }
51 written += ret;
52 }
53
54 return 0;
55 }
56
v4lconvert_helper_read(int fd,void * b,size_t count,char * progname)57 static int v4lconvert_helper_read(int fd, void *b, size_t count,
58 char *progname)
59 {
60 unsigned char *buf = b;
61 size_t ret, r = 0;
62
63 while (r < count) {
64 ret = read(fd, buf + r, count - r);
65 if (ret == -1) {
66 if (errno == EINTR)
67 continue;
68
69 fprintf(stderr, "%s: error reading: %s\n", progname, strerror(errno));
70 return -1;
71 }
72 if (ret == 0) /* EOF */
73 exit(0);
74
75 r += ret;
76 }
77
78 return 0;
79 }
80