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-rw-r--r--libbb/copyfd.c84
1 files changed, 27 insertions, 57 deletions
diff --git a/libbb/copyfd.c b/libbb/copyfd.c
index 27d65a419..591548379 100644
--- a/libbb/copyfd.c
+++ b/libbb/copyfd.c
@@ -4,19 +4,7 @@
*
* Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
*
- * 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
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <errno.h>
@@ -34,59 +22,41 @@
#endif
-static size_t bb_full_fd_action(int src_fd, int dst_fd, const size_t size2)
+static ssize_t bb_full_fd_action(int src_fd, int dst_fd, size_t size)
{
- int status;
- size_t xread, wrote, total, size = size2;
-
- if (src_fd < 0) {
- return -1;
- }
+ int status = -1;
+ size_t total = 0;
+ RESERVE_CONFIG_BUFFER(buffer,BUFSIZ);
- if (size == 0) {
- /* If size is 0 copy until EOF */
- size = ULONG_MAX;
- }
+ if (src_fd < 0) goto out;
+ while (!size || total < size)
{
- RESERVE_CONFIG_BUFFER(buffer,BUFSIZ);
- total = 0;
- wrote = 0;
- status = -1;
- while (total < size)
- {
- xread = BUFSIZ;
- if (size < (total + BUFSIZ))
- xread = size - total;
- xread = bb_full_read(src_fd, buffer, xread);
- if (xread > 0) {
- if (dst_fd < 0) {
- /* A -1 dst_fd means we need to fake it... */
- wrote = xread;
- } else {
- wrote = bb_full_write(dst_fd, buffer, xread);
- }
- if (wrote < xread) {
- bb_perror_msg(bb_msg_write_error);
- break;
- }
- total += wrote;
- } else if (xread < 0) {
- bb_perror_msg(bb_msg_read_error);
- break;
- } else if (xread == 0) {
- /* All done. */
- status = 0;
+ ssize_t wrote, xread = (size && size < BUFSIZ) ? size : BUFSIZ;
+ xread = bb_full_read(src_fd, buffer, xread);
+ if (xread > 0) {
+ /* A -1 dst_fd means we need to fake it... */
+ wrote = (dst_fd < 0) ? xread : bb_full_write(dst_fd, buffer, xread);
+ if (wrote < xread) {
+ bb_perror_msg(bb_msg_write_error);
break;
}
+ total += wrote;
+ size -= wrote;
+ } else if (xread < 0) {
+ bb_perror_msg(bb_msg_read_error);
+ break;
+ } else if (xread == 0) {
+ /* All done. */
+ status = 0;
+ break;
}
- RELEASE_CONFIG_BUFFER(buffer);
}
+
+out:
+ RELEASE_CONFIG_BUFFER(buffer);
- if (status == 0 || total)
- return total;
- /* Some sortof error occured */
- return -1;
+ return status ? status : total;
}