mirror of
https://github.com/sheumann/hush.git
synced 2024-12-23 05:29:58 +00:00
71 lines
1.8 KiB
C
71 lines
1.8 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Utility routines.
|
|
*
|
|
* Copyright (C) many different people. If you wrote this, please
|
|
* acknowledge your work.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful, but
|
|
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
|
|
* USA
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <sys/stat.h>
|
|
#include "libbb.h"
|
|
|
|
/* Copy CHUNKSIZE bytes (or until EOF if CHUNKSIZE equals -1) from SRC_FILE
|
|
* to DST_FILE. */
|
|
extern int copy_file_chunk(FILE *src_file, FILE *dst_file, unsigned long long chunksize)
|
|
{
|
|
size_t nread, nwritten, size;
|
|
char buffer[BUFSIZ];
|
|
|
|
while (chunksize != 0) {
|
|
if (chunksize > BUFSIZ)
|
|
size = BUFSIZ;
|
|
else
|
|
size = chunksize;
|
|
|
|
nread = fread (buffer, 1, size, src_file);
|
|
|
|
if (nread != size && ferror (src_file)) {
|
|
perror_msg ("read");
|
|
return -1;
|
|
} else if (nread == 0) {
|
|
if (chunksize != -1) {
|
|
error_msg ("Unable to read all data");
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
nwritten = fwrite (buffer, 1, nread, dst_file);
|
|
|
|
if (nwritten != nread) {
|
|
if (ferror (dst_file))
|
|
perror_msg ("write");
|
|
else
|
|
error_msg ("Unable to write all data");
|
|
return -1;
|
|
}
|
|
|
|
if (chunksize != -1)
|
|
chunksize -= nwritten;
|
|
}
|
|
|
|
return 0;
|
|
}
|