X-Git-Url: https://pd.if.org/git/?p=pdclib;a=blobdiff_plain;f=functions%2Fstring%2Fstrrchr.c;h=2a41874b64833dd9953b0ee2213f728b1ecf7a4e;hp=4249de3b17489863468b9735ac679978d97459e4;hb=da0f3f353d417fed71f358a48d5d5394145e460d;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec

diff --git a/functions/string/strrchr.c b/functions/string/strrchr.c
index 4249de3..2a41874 100644
--- a/functions/string/strrchr.c
+++ b/functions/string/strrchr.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.
-// ----------------------------------------------------------------------------
+/* strrchr( const char *, int c )
 
-// ----------------------------------------------------------------------------
-// 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 * strrchr( const char * s, int c ) { /* TODO */ };
-char * strrchr( char * s, int c ) { /* TODO */ };
+#include <string.h>
 
-// ----------------------------------------------------------------------------
-// Standard C
+#ifndef REGTEST
 
-char * strrchr( const char * s, int c ) { /* TODO */ };
+char * strrchr( const char * s, int c )
+{
+    size_t i = 0;
+    while ( s[i++] );
+    do
+    {
+        if ( s[--i] == (char) c )
+        {
+            return (char *) s + i;
+        }
+    } while ( i );
+    return NULL;
+}
+
+#endif
+
+#ifdef TEST
+#include "_PDCLIB_test.h"
+
+int main( void )
+{
+    char abccd[] = "abccd";
+    TESTCASE( strrchr( abcde, '\0' ) == &abcde[5] );
+    TESTCASE( strrchr( abcde, 'e' ) == &abcde[4] );
+    TESTCASE( strrchr( abcde, 'a' ) == &abcde[0] );
+    TESTCASE( strrchr( abccd, 'c' ) == &abccd[3] );
+    return TEST_RESULTS;
+}
+#endif