X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fstrchr.c;h=621100e04828860d931194276520020469f3168c;hb=d865c4403fc91d1f1ac95ba76febcee9f429bb97;hp=fb169049e22171e7f7fb9200c44fdf3ebbe653ef;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/string/strchr.c b/functions/string/strchr.c
index fb16904..621100e 100644
--- a/functions/string/strchr.c
+++ b/functions/string/strchr.c
@@ -1,17 +1,40 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* strchr( const char *, int )
 
-// ----------------------------------------------------------------------------
-// C++
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
 
-const char * strchr( const char * s, int c ) { /* TODO */ };
-char * strchr( char * s, int c ) { /* TODO */ };
+#include <string.h>
 
-// ----------------------------------------------------------------------------
-// Standard C
+#ifndef REGTEST
 
-char * strchr( const char * s, int c ) { /* TODO */ };
+char * strchr( const char * s, int c )
+{
+    do
+    {
+        if ( *s == (char) c )
+        {
+            return (char *) s;
+        }
+    } while ( *s++ );
+    return NULL;
+}
+
+#endif
+
+#ifdef TEST
+
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+    char abccd[] = "abccd";
+    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