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