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	/* 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	ssize_t FAST_FUNC full_write(int fd, const void *buf, size_t len)
18	{
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	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	return cc; /* write() returns -1 on failure. */
34	}
35
36	total += cc;
37	buf = ((const char *)buf) + cc;
38	len -= cc;
39	}
40
41	return total;
42	}