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 "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 FAST_FUNC 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) {
			if (total) {
				/* we already wrote some! */
				/* user can do another write to know the error code */
				return total;
			}
			return cc;	/* write() returns -1 on failure. */
		}

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

	return total;
}
1	niro	532	/* 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 "libbb.h"
11
12			/*
13			* Write all of the supplied buffer out to a file.
14			* This does multiple writes as necessary.
15			* Returns the amount written, or -1 on an error.
16			*/
17	niro	816	ssize_t FAST_FUNC full_write(int fd, const void *buf, size_t len)
18	niro	532	{
19			ssize_t cc;
20			ssize_t total;
21
22			total = 0;
23
24			while (len) {
25			cc = safe_write(fd, buf, len);
26
27	niro	816	if (cc < 0) {
28			if (total) {
29			/* we already wrote some! */
30			/* user can do another write to know the error code */
31			return total;
32			}
33	niro	532	return cc; /* write() returns -1 on failure. */
34	niro	816	}
35	niro	532
36			total += cc;
37			buf = ((const char *)buf) + cc;
38			len -= cc;
39			}
40
41			return total;
42			}