write-full.c revision 0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834
5e0ce63bb65db34d7f48b34bbb5545fa791781c4Timo Sirainen/* Copyright (c) 2002-2003 Timo Sirainen */
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen
d2f5aacd3d549c3d39dae41b6522d585244b016dTimo Sirainen#include "lib.h"
ca8863af6ce6b695a369dfb7b50e909420dc45dfTimo Sirainen#include "write-full.h"
d2f5aacd3d549c3d39dae41b6522d585244b016dTimo Sirainen
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen#include <unistd.h>
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainenint write_full(int fd, const void *data, size_t size)
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen{
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen ssize_t ret;
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen
279184dd3ab877f8f08c05f81a5570b20c6c215eTimo Sirainen while (size > 0) {
d2f5aacd3d549c3d39dae41b6522d585244b016dTimo Sirainen ret = write(fd, data, size < SSIZE_T_MAX ? size : SSIZE_T_MAX);
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen if (ret < 0)
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen return -1;
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen if (ret == 0) {
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen /* nothing was written, only reason for this should
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen be out of disk space */
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen errno = ENOSPC;
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen return -1;
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen }
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen size -= ret;
279184dd3ab877f8f08c05f81a5570b20c6c215eTimo Sirainen }
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen return 0;
c27c55fe2c083c7573cde51e366ef689c1a69708Timo Sirainen}
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainenint pwrite_full(int fd, const void *data, size_t size, off_t offset)
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen{
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen ssize_t ret;
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen while (size > 0) {
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen ret = pwrite(fd, data, size < SSIZE_T_MAX ?
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen size : SSIZE_T_MAX, offset);
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen if (ret < 0)
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen return -1;
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen if (ret == 0) {
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen /* nothing was written, only reason for this should
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen be out of disk space */
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen errno = ENOSPC;
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen return -1;
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen }
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen size -= ret;
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen offset += ret;
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen }
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen return 0;
0cb2e8eb55e70f8ebe1e8349bdf49e4cbe5d8834Timo Sirainen}