source: branches/stable/mindi-busybox/libbb/full_read.c @ 821

Last change on this file since 821 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: 775 bytes
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) 1999-2004 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 <stdio.h>
11#include <unistd.h>
12#include "libbb.h"
13
14/*
15 * Read all of the supplied buffer from a file.
16 * This does multiple reads as necessary.
17 * Returns the amount read, or -1 on an error.
18 * A short read is returned on an end of file.
19 */
20ssize_t bb_full_read(int fd, void *buf, size_t len)
21{
22    ssize_t cc;
23    ssize_t total;
24
25    total = 0;
26
27    while (len > 0) {
28        cc = safe_read(fd, buf, len);
29
30        if (cc < 0)
31            return cc;  /* read() returns -1 on failure. */
32
33        if (cc == 0)
34            break;
35
36        buf = ((char *)buf) + cc;
37        total += cc;
38        len -= cc;
39    }
40
41    return total;
42}
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