1 /* vi: set sw=4 ts=4: */
5 * Copyright (C) tons of folks. Tracking down who wrote what
6 * isn't something I'm going to worry about... If you wrote something
7 * here, please feel free to acknowledge your work.
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
24 * Permission has been granted to redistribute this code under the GPL.
33 * Copy chunksize bytes between two file descriptors
35 * unsigned long is used so that if -1 is passed as chunksize it will read as
36 * much as possible, and it will work with off_t or off64_t
38 extern int copy_file_chunk(FILE *src_file, FILE *dst_file, unsigned long long chunksize)
40 off_t size, amount_written;
41 char buffer[BUFSIZ]; /* BUFSIZ is declared in stdio.h */
43 while (chunksize > 0) {
44 if (chunksize > BUFSIZ) {
49 amount_written = fwrite(buffer, 1, fread(buffer, 1, size, src_file), dst_file);
50 if (amount_written != size) {
51 error_msg("Couldnt write correct amount");
54 chunksize -= amount_written;