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authorRoland McGrath <roland@gnu.org>1996-03-14 11:20:23 +0000
committerRoland McGrath <roland@gnu.org>1996-03-14 11:20:23 +0000
commit8d71c7b0e4f76dce251a121e07dff8212bed73f8 (patch)
treea90fd3140fbd2922cb6006150f8a89f4be0c888d /string/strnlen.c
parent52e9a9d1187e1a2a7357f3a0f353058e14667d62 (diff)
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Thu Mar 14 06:01:07 1996 Roland McGrath <roland@charlie-brown.gnu.ai.mit.edu>
	* string/strnlen.c: New file.
	* string/Makefile (routines): Add strnlen.
	* string/string.h [__USE_GNU] (strnlen): Declare new function.
	[__OPTIMIZE__]: Define extern inline implementation of it.
Diffstat (limited to 'string/strnlen.c')
-rw-r--r--string/strnlen.c30
1 files changed, 30 insertions, 0 deletions
diff --git a/string/strnlen.c b/string/strnlen.c
new file mode 100644
index 0000000000..eb01a63692
--- /dev/null
+++ b/string/strnlen.c
@@ -0,0 +1,30 @@
+/* Find the length of STRING, but scan at most MAXLEN characters.
+Copyright (C) 1996 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <string.h>
+
+/* Find the length of STRING, but scan at most MAXLEN characters.
+   If no '\0' terminator is found in that many characters, return MAXLEN.  */
+
+size_t
+strnlen (const char *string, size_t maxlen)
+{
+  const char *end = memchr (string, '\0', maxlen);
+  return end ? end - string : maxlen;
+}