62 lines
1.4 KiB
C
62 lines
1.4 KiB
C
/*
|
|
FUNCTION
|
|
<<wcpncpy>>---copy part of a wide-character string returning a pointer to its end
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <wchar.h>
|
|
wchar_t *wcpncpy(wchar_t *<[s1]>, const wchar_t *<[s2]>, size_t <[n]>);
|
|
|
|
TRAD_SYNOPSIS
|
|
wchar_t *wcpncpy(<[s1]>, <[s2]>, <[n]>
|
|
wchar_t *<[s1]>;
|
|
const wchar_t *<[s2]>;
|
|
size_t <[n]>;
|
|
|
|
DESCRIPTION
|
|
The <<wcpncpy>> function copies not more than n wide-character codes
|
|
(wide-character codes that follow a null wide-character code are not
|
|
copied) from the array pointed to by <[s2]> to the array pointed to
|
|
by <[s1]>. If copying takes place between objects that overlap, the
|
|
behaviour is undefined.
|
|
|
|
If the array pointed to by <[s2]> is a wide-character string that is
|
|
shorter than <[n]> wide-character codes, null wide-character codes are
|
|
appended to the copy in the array pointed to by <[s1]>, until <[n]>
|
|
wide-character codes in all are written.
|
|
|
|
RETURNS
|
|
The <<wcpncpy>> function returns <[s1]>; no return value is reserved to
|
|
indicate an error.
|
|
|
|
PORTABILITY
|
|
<<wcpncpy>> is ISO/IEC 9899/AMD1:1995 (ISO C).
|
|
|
|
No supporting OS subroutines are required.
|
|
*/
|
|
|
|
#include <_ansi.h>
|
|
#include <wchar.h>
|
|
|
|
wchar_t *
|
|
_DEFUN (wcpncpy, (dst, src, count),
|
|
wchar_t * dst _AND
|
|
_CONST wchar_t * src _AND
|
|
size_t count)
|
|
{
|
|
wchar_t *ret = NULL;
|
|
|
|
while (count > 0)
|
|
{
|
|
--count;
|
|
if ((*dst++ = *src++) == L'\0')
|
|
{
|
|
ret = dst - 1;
|
|
break;
|
|
}
|
|
}
|
|
while (count-- > 0)
|
|
*dst++ = L'\0';
|
|
|
|
return ret ? ret : dst;
|
|
}
|