X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fstrncmp.c;h=ac9c10f38b51cf5397cd2caa98d5215ff5ec79c9;hb=a5d6aa23d413d22e6eed9c9d813b063f70cddb16;hp=f64984ebc1b9ec4f5fc3a2e396560029124e6b89;hpb=c2f1367984ba4153d892062759c3813020b65a9a;p=pdclib

diff --git a/functions/string/strncmp.c b/functions/string/strncmp.c
index f64984e..ac9c10f 100644
--- a/functions/string/strncmp.c
+++ b/functions/string/strncmp.c
@@ -1,7 +1,5 @@
 /* $Id$ */
 
-/* Release $Name$ */
-
 /* strncmp( const char *, const char *, size_t )
 
    This file is part of the Public Domain C Library (PDCLib).
@@ -10,9 +8,11 @@
 
 #include <string.h>
 
+#ifndef REGTEST
+
 int strncmp( const char * s1, const char * s2, size_t n )
 {
-    while ( n && ( *s1 == *s2 ) )
+    while ( *s1 && n && ( *s1 == *s2 ) )
     {
         ++s1;
         ++s2;
@@ -27,3 +27,26 @@ int strncmp( const char * s1, const char * s2, size_t n )
         return ( *s1 - *s2 );
     }
 }
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    char cmpabcde[] = "abcde\0f";
+    char empty[] = "";
+    char x[] = "x";
+    TESTCASE( strncmp( abcde, cmpabcde, 5 ) == 0 );
+    TESTCASE( strncmp( abcde, cmpabcde, 10 ) == 0 );
+    TESTCASE( strncmp( abcde, abcdx, 5 ) < 0 );
+    TESTCASE( strncmp( abcdx, abcde, 5 ) > 0 );
+    TESTCASE( strncmp( empty, abcde, 5 ) < 0 );
+    TESTCASE( strncmp( abcde, empty, 5 ) > 0 );
+    TESTCASE( strncmp( abcde, abcdx, 4 ) == 0 );
+    TESTCASE( strncmp( abcde, x, 0 ) == 0 );
+    TESTCASE( strncmp( abcde, x, 1 ) < 0 );
+    return TEST_RESULTS;
+}
+#endif