Add implementation of strnlen for systems without this function

Signed-off-by: Yaakov Selkowitz <yselkowitz@users.sourceforge.net>
Signed-off-by: Jeremy Huddleston <jeremyhu@freedesktop.org>

5 files changed, 76 insertions, 1 deletions

diff --git a/Makefile.am b/Makefile.am
index 59887e2..94f3111 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -22,7 +22,7 @@
 bin_PROGRAMS = xlsclients
 
 AM_CFLAGS = $(CWARNFLAGS) $(XLSCLIENTS_CFLAGS)
-xlsclients_LDADD = $(XLSCLIENTS_LIBS)
+xlsclients_LDADD = $(XLSCLIENTS_LIBS) $(LIBOBJS)
 
 xlsclients_SOURCES =	\
         xlsclients.c
diff --git a/configure.ac b/configure.ac
index f665380..3b28926 100644
--- a/configure.ac
+++ b/configure.ac
@@ -39,6 +39,9 @@ AC_PROG_INSTALL
 # Check for functional strnlen
 AC_USE_SYSTEM_EXTENSIONS
 AC_FUNC_STRNLEN
+if test "x$ac_cv_func_strnlen_working" = xyes; then
+  AC_DEFINE(HAVE_STRNLEN, 1, [Define to 1 if you have a working strnlen function.])
+fi
 
 XORG_DEFAULT_OPTIONS
 
diff --git a/strnlen.c b/strnlen.c
new file mode 100644
index 0000000..725e262
--- /dev/null
+++ b/strnlen.c
@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2009 Apple Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+ /*
+  * Author:  Jeremy Huddleston, Apple Inc.
+  */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <strnlen.h>
+#include <string.h>
+
+size_t strnlen(const char *s, size_t maxlen) {
+    const char *p = memchr(s, 0, maxlen);
+    return (size_t)(p ? (p - s) : maxlen);
+}
diff --git a/strnlen.h b/strnlen.h
new file mode 100644
index 0000000..e1cdb85
--- /dev/null
+++ b/strnlen.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2009 Apple Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+ /*
+  * Author:  Jeremy Huddleston, Apple Inc.
+  */
+
+#ifndef __STRNLEN_H__
+#define __STRNLEN_H__ 1
+#include <stdlib.h>
+
+extern size_t strnlen(const char *s, size_t maxlen);
+#endif /* __STRNLEN_H__ */
diff --git a/xlsclients.c b/xlsclients.c
index 049bc4c..2452352 100644
--- a/xlsclients.c
+++ b/xlsclients.c
@@ -37,6 +37,9 @@ in this Software without prior written authorization from The Open Group.
 #include <xcb/xcb.h>
 #include <xcb/xproto.h>
 #include <xcb/xcb_atom.h>
+#ifndef HAVE_STRNLEN
+#include "strnlen.h"
+#endif
 
 static char *ProgramName;