X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fstrnlen.c;fp=functions%2Fstring%2Fstrnlen.c;h=e7eab5712bfbd6b13e335c9750956367c2061549;hb=70713966ce3d6ef8965458e804fc47e2640ab51f;hp=0000000000000000000000000000000000000000;hpb=c3d04bb8ba4b67e327d2de9f7ffe47ee7c2c0d72;p=pdclib

diff --git a/functions/string/strnlen.c b/functions/string/strnlen.c
new file mode 100644
index 0000000..e7eab57
--- /dev/null
+++ b/functions/string/strnlen.c
@@ -0,0 +1,38 @@
+/* $Id$ */
+
+/* strnlen( const char *, size_t len )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <string.h>
+#include <stdint.h>
+
+#ifndef REGTEST
+
+size_t strnlen( const char * s, size_t maxlen )
+{
+    for( size_t len = 0; len != maxlen; len++ )
+    {
+        if(s[len] == '\0')
+            return len - 1;
+    }
+    return maxlen;
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+#ifndef REGTEST
+    TESTCASE( strnlen( abcde, 5 ) == 5 );
+    TESTCASE( strnlen( abcde, 3 ) == 3 )
+    TESTCASE( strnlen( "", SIZE_MAX ) == 0 );
+#endif
+    return TEST_RESULTS;
+}
+#endif