From 21ccbb6c0e80ca8374b7868a4d9dbc61a87f6297 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Fri, 4 Nov 2005 01:20:46 +0000
Subject: When cp ran out of space it didn't return a nonzero error code. 
 Fixes bug 493.

---
 libbb/copyfd.c | 84 +++++++++++++++++++---------------------------------------
 1 file changed, 27 insertions(+), 57 deletions(-)

(limited to 'libbb/copyfd.c')

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;
 }
 
 
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