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/* strncpy_s( char *, rsize_t, const char *, rsize_t )
This file is part of the Public Domain C Library (PDCLib).
Permission is granted to use, modify, and / or redistribute at will.
*/
#define __STDC_WANT_LIB_EXT1__ 1
#include <string.h>
#include <stdint.h>
#include <stdlib.h>
#ifndef REGTEST
errno_t strncpy_s( char * _PDCLIB_restrict s1, rsize_t s1max, const char * _PDCLIB_restrict s2, rsize_t n )
{
char * dest = s1;
const char * src = s2;
if ( s1 != NULL && s2 != NULL && s1max <= RSIZE_MAX && n <= RSIZE_MAX && s1max != 0 )
{
while ( s1max-- )
{
if ( dest == s2 || src == s1 )
{
goto runtime_constraint_violation;
}
if ( n-- == 0 || ( *dest++ = *src++ ) == '\0' )
{
return 0;
}
}
}
runtime_constraint_violation:
if ( s1 != NULL && s1max > 0 && s1max <= RSIZE_MAX )
{
s1[0] = '\0';
}
_PDCLIB_constraint_handler( _PDCLIB_CONSTRAINT_VIOLATION( _PDCLIB_EINVAL ) );
return _PDCLIB_EINVAL;
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
#if ! defined( REGTEST ) || defined( __STDC_LIB_EXT1__ )
static int HANDLER_CALLS = 0;
static void test_handler( const char * _PDCLIB_restrict msg, void * _PDCLIB_restrict ptr, errno_t error )
{
++HANDLER_CALLS;
}
#endif
int main( void )
{
#if ! defined( REGTEST ) || defined( __STDC_LIB_EXT1__ )
char s[] = "xxxxxxx";
set_constraint_handler_s( test_handler );
TESTCASE( strncpy_s( s, 8, "", 1 ) == 0 );
TESTCASE( s[0] == '\0' );
TESTCASE( s[1] == 'x' );
TESTCASE( strncpy_s( s, 8, abcde, 6 ) == 0 );
TESTCASE( s[0] == 'a' );
TESTCASE( s[4] == 'e' );
TESTCASE( s[5] == '\0' );
TESTCASE( s[6] == 'x' );
TESTCASE( strncpy_s( s, 8, abcde, 7 ) == 0 );
/* Different from strncpy()! */
TESTCASE( s[5] == '\0' );
TESTCASE( s[6] == 'x' );
TESTCASE( strncpy_s( s, 8, "xxxx", 3 ) == 0 );
TESTCASE( s[0] == 'x' );
TESTCASE( s[2] == 'x' );
TESTCASE( s[3] == 'd' );
/* Overrun. */
TESTCASE( strncpy_s( s, 8, "abcdefgh", 9 ) != 0 );
TESTCASE( strncpy_s( s, 8, "abcdefgh", 9 ) != 0 );
TESTCASE( HANDLER_CALLS == 2 );
#endif
return TEST_RESULTS;
}
#endif
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