1 /* strncpy( char *, const char *, size_t )
3 This file is part of the Public Domain C Library (PDCLib).
4 Permission is granted to use, modify, and / or redistribute at will.
11 char * strncpy( char * _PDCLIB_restrict s1, const char * _PDCLIB_restrict s2, size_t n )
14 while ( ( n > 0 ) && ( *s1++ = *s2++ ) )
16 /* Cannot do "n--" in the conditional as size_t is unsigned and we have
17 to check it again for >0 in the next loop below, so we must not risk
22 /* Checking against 1 as we missed the last --n in the loop above. */
34 #include "_PDCLIB_test.h"
39 TESTCASE( strncpy( s, "", 1 ) == s );
40 TESTCASE( s[0] == '\0' );
41 TESTCASE( s[1] == 'x' );
42 TESTCASE( strncpy( s, abcde, 6 ) == s );
43 TESTCASE( s[0] == 'a' );
44 TESTCASE( s[4] == 'e' );
45 TESTCASE( s[5] == '\0' );
46 TESTCASE( s[6] == 'x' );
47 TESTCASE( strncpy( s, abcde, 7 ) == s );
48 TESTCASE( s[6] == '\0' );
49 TESTCASE( strncpy( s, "xxxx", 3 ) == s );
50 TESTCASE( s[0] == 'x' );
51 TESTCASE( s[2] == 'x' );
52 TESTCASE( s[3] == 'd' );