When cp ran out of space it didn't return a nonzero error code. Fixes bug 493.

git-svn-id: svn://busybox.net/trunk/busybox@12146 69ca8d6d-28ef-0310-b511-8ec308f3f277

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;
 }