/*
* Utility routines.
*
- * Copyright (C) tons of folks. Tracking down who wrote what
- * isn't something I'm going to worry about... If you wrote something
- * here, please feel free to acknowledge your work.
+ * 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
+ * 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
- *
- * Based in part on code from sash, Copyright (c) 1999 by David I. Bell
- * Permission has been granted to redistribute this code under the GPL.
- *
+ * 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 between two file descriptors
- */
-int copy_file_chunk(int srcfd, int dstfd, size_t chunksize)
+/* 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 size;
- char buffer[BUFSIZ]; /* BUFSIZ is declared in stdio.h */
-
- while (chunksize > 0) {
- if (chunksize > BUFSIZ)
- size = BUFSIZ;
- else
- size = chunksize;
- if (full_write(dstfd, buffer, full_read(srcfd, buffer, size)) < size)
- return(FALSE);
- chunksize -= size;
- }
- return (TRUE);
-}
+ size_t nread, nwritten, size;
+ char buffer[BUFSIZ];
+ while (chunksize != 0) {
+ if (chunksize > BUFSIZ)
+ size = BUFSIZ;
+ else
+ size = chunksize;
-/* END CODE */
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
+ 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;
+}