busybox/libbb/full_write.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include <stdio.h>
#include <unistd.h>
#include "libbb.h"

/*
 * Write all of the supplied buffer out to a file.
 * This does multiple writes as necessary.
 * Returns the amount written, or -1 on an error.
 */
ssize_t full_write(int fd, const void *buf, size_t len)
{
	ssize_t cc;
	ssize_t total;

	total = 0;

	while (len) {
		cc = safe_write(fd, buf, len);

		if (cc < 0)
			return cc;	/* write() returns -1 on failure. */

		total += cc;
		buf = ((const char *)buf) + cc;
		len -= cc;
	}

	return total;
}
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	* Write all of the supplied buffer out to a file.
16	* This does multiple writes as necessary.
17	* Returns the amount written, or -1 on an error.
18	*/
19	ssize_t full_write(int fd, const void *buf, size_t len)
20	{
21	ssize_t cc;
22	ssize_t total;
23
24	total = 0;
25
26	while (len) {
27	cc = safe_write(fd, buf, len);
28
29	if (cc < 0)
30	return cc; /* write() returns -1 on failure. */
31
32	total += cc;
33	buf = ((const char *)buf) + cc;
34	len -= cc;
35	}
36
37	return total;
38	}