Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Utility routines. |
| 4 | * |
Eric Andersen | c7bda1c | 2004-03-15 08:29:22 +0000 | [diff] [blame] | 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 6 | * |
Bernhard Reutner-Fischer | b1629b1 | 2006-05-19 19:29:19 +0000 | [diff] [blame] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 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 | */ |
Rob Landley | 5343747 | 2006-07-16 08:14:35 +0000 | [diff] [blame] | 19 | ssize_t full_write(int fd, const void *buf, size_t len) |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 20 | { |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 21 | ssize_t cc; |
| 22 | ssize_t total; |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 23 | |
| 24 | total = 0; |
| 25 | |
| 26 | while (len > 0) { |
Eric Andersen | dae099b | 2003-10-09 08:35:42 +0000 | [diff] [blame] | 27 | cc = safe_write(fd, buf, len); |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 28 | |
| 29 | if (cc < 0) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 30 | return cc; /* write() returns -1 on failure. */ |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 31 | |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 32 | total += cc; |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 33 | buf = ((const char *)buf) + cc; |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 34 | len -= cc; |
| 35 | } |
| 36 | |
| 37 | return total; |
| 38 | } |