/* $Id$ */
-/* Release $Name$ */
-
/* strncpy( 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 <_PDCLIB_aux.h>
#include <string.h>
+#ifndef REGTEST
+
char * strncpy( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n )
{
char * rc = s1;
while ( ( n > 0 ) && ( *s1++ = *s2++ ) )
{
/* Cannot do "n--" in the conditional as size_t is unsigned and we have
- to check it again for >0 in the next loop.
+ to check it again for >0 in the next loop below, so we must not risk
+ underflow.
*/
--n;
}
- while ( n-- )
+ /* Checking against 1 as we missed the last --n in the loop above. */
+ while ( n-- > 1 )
{
*s1++ = '\0';
}
return rc;
}
-#warning Test driver missing.
+#endif
#ifdef TEST
-int main()
+#include <_PDCLIB_test.h>
+
+int main( void )
{
- return 0;
+ char s[] = "xxxxxxx";
+ TESTCASE( strncpy( s, "", 1 ) == s );
+ TESTCASE( s[0] == '\0' );
+ TESTCASE( s[1] == 'x' );
+ TESTCASE( strncpy( s, abcde, 6 ) == s );
+ TESTCASE( s[0] == 'a' );
+ TESTCASE( s[4] == 'e' );
+ TESTCASE( s[5] == '\0' );
+ TESTCASE( s[6] == 'x' );
+ TESTCASE( strncpy( s, abcde, 7 ) == s );
+ TESTCASE( s[6] == '\0' );
+ TESTCASE( strncpy( s, "xxxx", 3 ) == s );
+ TESTCASE( s[0] == 'x' );
+ TESTCASE( s[2] == 'x' );
+ TESTCASE( s[3] == 'd' );
+ return TEST_RESULTS;
}
#endif