X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstring%2Fstrncmp.c;h=7f398fa9b2b9be4bce4763afabf4bf737e4bf2d2;hb=ba5eff8dd9b426485e1559b5d6204692d155d9e8;hp=ec9c56fb2a780e1a2a40efee5451c4c7836975df;hpb=0a5395faab237ba9008352b0f4bee9659bbd3d5f;p=pdclib

diff --git a/functions/string/strncmp.c b/functions/string/strncmp.c
index ec9c56f..7f398fa 100644
--- a/functions/string/strncmp.c
+++ b/functions/string/strncmp.c
@@ -1,27 +1,38 @@
-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// Public Domain C Library - http://pdclib.sourceforge.net
-// This code is Public Domain. Use, modify, and redistribute at will.
-// ----------------------------------------------------------------------------
+/* $Id$ */
 
-int strncmp( const char * s1, const char * s2, size_t n ) { /* TODO */ };
+/* Release $Name$ */
 
-/* PDPC code - unreviewed
+/* strncmp( const char *, const char *, size_t )
+
+   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>
+
+int strncmp( const char * s1, const char * s2, size_t n )
 {
-    const unsigned char *p1;
-    const unsigned char *p2;
-    size_t x = 0;
-    
-    p1 = (const unsigned char *)s1;
-    p2 = (const unsigned char *)s2;
-    while (x < n)
+    while ( n && ( *s1 == *s2 ) )
     {
-        if (p1[x] < p2[x]) return (-1);
-        else if (p1[x] > p2[x]) return (1);
-        else if (p1[x] == '\0') return (0);
-        x++;
+        ++s1;
+        ++s2;
+        --n;
+    }
+    if ( ( n == 0 ) )
+    {
+        return 0;
+    }
+    else
+    {
+        return ( *s1 - *s2 );
     }
-    return (0);
 }
-*/
+
+#warning Test driver missing.
+
+#ifdef TEST
+int main()
+{
+    return 0;
+}
+#endif