Added test drivers.

[pdclib] / functions / string / strchr.c

diff --git a/functions/string/strchr.c b/functions/string/strchr.c
index fb169049e22171e7f7fb9200c44fdf3ebbe653ef..96ab0519aafbbdc8f4be004cf77929fabfc1914c 100644 (file)
--- a/functions/string/strchr.c
+++ b/functions/string/strchr.c
@@ -1,17 +1,39 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* $Id$ */
 
-// ----------------------------------------------------------------------------
-// C++
+/* Release $Name$ */
 
-const char * strchr( const char * s, int c ) { /* TODO */ };
-char * strchr( char * s, int c ) { /* TODO */ };
+/* strchr( const char *, int )
 
-// ----------------------------------------------------------------------------
-// Standard C
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
 
-char * strchr( const char * s, int c ) { /* TODO */ };
+#include <string.h>
+
+char * strchr( const char * s, int c )
+{
+    do
+    {
+        if ( *s == (char) c )
+        {
+            return (char *) s;
+        }
+    } while ( *s++ );
+    return NULL;
+}
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main()
+{
+    char abccd[] = "abccd";
+    BEGIN_TESTS;
+    TESTCASE( strchr( abccd, 'x' ) == NULL );
+    TESTCASE( strchr( abccd, 'a' ) == &abccd[0] );
+    TESTCASE( strchr( abccd, 'd' ) == &abccd[4] );
+    TESTCASE( strchr( abccd, '\0' ) == &abccd[5] );
+    TESTCASE( strchr( abccd, 'c' ) == &abccd[2] );
+    return TEST_RESULTS;
+}
+#endif