libite 2.6.1
fsendfile.c
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1/* Copy data between file streams
2 *
3 * Copyright (c) 2013 Tobias Waldekranz <tobias@waldekranz.com>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
21 * THE SOFTWARE.
22 */
23
30
31#include <errno.h>
32#include <stdio.h>
33#include <stdlib.h>
34
35
51ssize_t fsendfile(FILE *src, FILE *dst, size_t len)
52{
53 char *buf;
54 size_t tot = 0;
55 ssize_t blk = BUFSIZ, num = 0;
56
57 if (!src) {
58 errno = EINVAL;
59 return -1;
60 }
61
62 buf = malloc(BUFSIZ);
63 if (!buf)
64 return -1;
65
66 while (!len || tot < len) {
67 if (len && ((len - tot) < BUFSIZ))
68 blk = len - tot;
69
70 num = fread(buf, 1, blk, src);
71 if (num == 0)
72 break;
73
74 if (dst && (fwrite(buf, num, 1, dst) != 1)) {
75 num = -1;
76 break;
77 }
78
79 tot += num;
80 }
81
82 free(buf);
83
84 return (num == -1) ? -1 : (ssize_t)tot;
85}
86
ssize_t fsendfile(FILE *src, FILE *dst, size_t len)
Definition fsendfile.c:51