source: branches/2.2.2/mindi-busybox/libbb/copyfd.c @ 1247

Last change on this file since 1247 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
8 */
9
10#include <errno.h>
11#include <stdlib.h>
12#include <string.h>
13#include <unistd.h>
14
15#include "libbb.h"
16
17
18#if BUFSIZ < 4096
19#undef BUFSIZ
20#define BUFSIZ 4096
21#endif
22
23
24static ssize_t bb_full_fd_action(int src_fd, int dst_fd, size_t size)
25{
26    int status = -1;
27    size_t total = 0;
28    RESERVE_CONFIG_BUFFER(buffer,BUFSIZ);
29
30    if (src_fd < 0) goto out;
31    while (!size || total < size)
32    {
33        ssize_t wrote, xread;
34
35        xread = safe_read(src_fd, buffer,
36                (!size || size - total > BUFSIZ) ? BUFSIZ : size - total);
37
38        if (xread > 0) {
39            /* A -1 dst_fd means we need to fake it... */
40            wrote = (dst_fd < 0) ? xread : bb_full_write(dst_fd, buffer, xread);
41            if (wrote < xread) {
42                bb_perror_msg(bb_msg_write_error);
43                break;
44            }
45            total += wrote;
46            if (total == size) status = 0;
47        } else if (xread < 0) {
48            bb_perror_msg(bb_msg_read_error);
49            break;
50        } else if (xread == 0) {
51            /* All done. */
52            status = 0;
53            break;
54        }
55    }
56
57out:
58    RELEASE_CONFIG_BUFFER(buffer);
59
60    return status ? status : (ssize_t)total;
61}
62
63
64int bb_copyfd_size(int fd1, int fd2, const off_t size)
65{
66    if (size) {
67        return(bb_full_fd_action(fd1, fd2, size));
68    }
69    return(0);
70}
71
72int bb_copyfd_eof(int fd1, int fd2)
73{
74    return(bb_full_fd_action(fd1, fd2, 0));
75}
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