lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 source tree. |
| 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 | } |