* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
-#include <stdio.h>
-#include <unistd.h>
#include "libbb.h"
/*
* 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 FAST_FUNC full_write(int fd, const void *buf, size_t len)
{
ssize_t cc;
ssize_t total;
while (len) {
cc = safe_write(fd, buf, len);
- if (cc < 0)
- return cc; /* write() returns -1 on failure. */
+ 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;