X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fstrcmp.c;h=2edf7eef9043da27e1d0e330b27d4bc1d58d72aa;hb=b1fc26afebd4d557ff89a44bc21767a8704c3809;hp=9906f49aa07b140883fc420c0c2dd1b91e50c285;hpb=34893ecc2200dc7017c36a54cb6c5f4c2378b5ec;p=pdclib

diff --git a/functions/string/strcmp.c b/functions/string/strcmp.c
index 9906f49..2edf7ee 100644
--- a/functions/string/strcmp.c
+++ b/functions/string/strcmp.c
@@ -1,8 +1,39 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
-
-int strcmp( const char * s1, const char * s2 ) { /* TODO */ };
+/* strcmp( const char *, const char * )
+
+   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>
+
+#ifndef REGTEST
+
+int strcmp( const char * s1, const char * s2 )
+{
+    while ( ( *s1 ) && ( *s1 == *s2 ) )
+    {
+        ++s1;
+        ++s2;
+    }
+    return ( *(unsigned char *)s1 - *(unsigned char *)s2 );
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    char cmpabcde[] = "abcde";
+    char cmpabcd_[] = "abcd\xfc";
+    char empty[] = "";
+    TESTCASE( strcmp( abcde, cmpabcde ) == 0 );
+    TESTCASE( strcmp( abcde, abcdx ) < 0 );
+    TESTCASE( strcmp( abcdx, abcde ) > 0 );
+    TESTCASE( strcmp( empty, abcde ) < 0 );
+    TESTCASE( strcmp( abcde, empty ) > 0 );
+    TESTCASE( strcmp( abcde, cmpabcd_ ) < 0 );
+    return TEST_RESULTS;
+}
+#endif