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authorJim Meyering <jim@meyering.net>2003-01-06 13:08:59 +0000
committerJim Meyering <jim@meyering.net>2003-01-06 13:08:59 +0000
commit685ac06eef12d077777b5cac60e23d6123b9cf84 (patch)
tree0b690f3063b6bf83169f2141ae787e82b7d5efb0 /lib/full-read.c
parentdd020962346fe5952e3628df0bd7f7a16659a079 (diff)
downloadcoreutils-685ac06eef12d077777b5cac60e23d6123b9cf84.tar.xz
.
Diffstat (limited to 'lib/full-read.c')
-rw-r--r--lib/full-read.c65
1 files changed, 65 insertions, 0 deletions
diff --git a/lib/full-read.c b/lib/full-read.c
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+++ b/lib/full-read.c
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+/* An interface to read() that reads all it is asked to read.
+
+ Copyright (C) 1993, 1994, 1997, 1998, 1999, 2000, 2001, 2002 Free Software
+ Foundation, Inc.
+
+ 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, 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, read to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+/* Specification. */
+#include "full-read.h"
+
+#include <errno.h>
+#ifndef errno
+extern int errno;
+#endif
+
+#include "safe-read.h"
+
+/* Read COUNT bytes at BUF to descriptor FD, retrying if interrupted
+ or if partial reads occur. Return the number of bytes successfully
+ read, setting errno if that is less than COUNT. errno = 0 means EOF. */
+size_t
+full_read (int fd, void *buf, size_t count)
+{
+ size_t total_read = 0;
+
+ if (count > 0)
+ {
+ char *ptr = buf;
+
+ do
+ {
+ size_t nread = safe_read (fd, ptr, count);
+ if (nread == (size_t)-1)
+ break;
+ if (nread == 0)
+ {
+ /* EOF. */
+ errno = 0;
+ break;
+ }
+ total_read += nread;
+ ptr += nread;
+ count -= nread;
+ }
+ while (count > 0);
+ }
+
+ return total_read;
+}