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