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/* 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 <string.h>
#ifndef REGTEST
char * strncpy( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n )
{
char * rc = s1;
while ( n && ( *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 below, so we must not risk
underflow.
*/
--n;
}
/* Checking against 1 as we missed the last --n in the loop above. */
while ( n-- > 1 )
{
*s1++ = '\0';
}
return rc;
}
#endif
#ifdef TEST
#include "_PDCLIB_test.h"
int main( void )
{
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
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