fix append mode; mason@primenet.com.au

1 files changed, 12 insertions, 1 deletions

diff --git a/lib/libc/stdio/freopen.c b/lib/libc/stdio/freopen.c
index ddf92115f1c..35f92d47cf1 100644
--- a/lib/libc/stdio/freopen.c
+++ b/lib/libc/stdio/freopen.c
@@ -35,7 +35,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: freopen.c,v 1.3 1996/08/19 08:32:45 tholo Exp $";
+static char rcsid[] = "$OpenBSD: freopen.c,v 1.4 1998/11/10 22:10:21 deraadt Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/types.h>
@@ -151,5 +151,16 @@ freopen(file, mode, fp)
 	fp->_write = __swrite;
 	fp->_seek = __sseek;
 	fp->_close = __sclose;
+
+	/*
+	 * When opening in append mode, even though we use O_APPEND,
+	 * we need to seek to the end so that ftell() gets the right
+	 * answer.  If the user then alters the seek pointer, or
+	 * the file extends, this will fail, but there is not much
+	 * we can do about this.  (We could set __SAPP and check in
+	 * fseek and ftell.)
+	 */
+	if (oflags & O_APPEND)
+		(void) __sseek((void *)fp, (fpos_t)0, SEEK_END);
 	return (fp);
 }