-// ----------------------------------------------------------------------------
-// $Id$
-// ----------------------------------------------------------------------------
-// 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 */ };
+/* strncmp( const char *, const char *, size_t )
-/* PDPC code - unreviewed
+ 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 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 ( *s1 && n && ( *s1 == *s2 ) )
+ {
+ ++s1;
+ ++s2;
+ --n;
+ }
+ if ( n == 0 )
+ {
+ return 0;
+ }
+ else
{
- if (p1[x] < p2[x]) return (-1);
- else if (p1[x] > p2[x]) return (1);
- else if (p1[x] == '\0') return (0);
- x++;
+ return ( *(unsigned char *)s1 - *(unsigned char *)s2 );
}
- return (0);
}
-*/
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+ char cmpabcde[] = "abcde\0f";
+ char cmpabcd_[] = "abcde\xfc";
+ 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 );
+ TESTCASE( strncmp( abcde, cmpabcd_, 10 ) < 0 );
+ return TEST_RESULTS;
+}
+#endif