60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
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FUNCTION
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<<wcsncpy>>---copy part of a wide-character string
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ANSI_SYNOPSIS
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#include <wchar.h>
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wchar_t *wcsncpy(wchar_t *__restrict <[s1]>,
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const wchar_t *__restrict <[s2]>, size_t <[n]>);
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TRAD_SYNOPSIS
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wchar_t *wcsncpy(<[s1]>, <[s2]>, <[n]>
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wchar_t *__restrict <[s1]>;
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const wchar_t *__restrict <[s2]>;
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size_t <[n]>;
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DESCRIPTION
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The <<wcsncpy>> 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. Note that if <[s1]> contains more than <[n]>
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wide characters before its terminating null, the result is not
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null-terminated.
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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 <<wcsncpy>> 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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ISO/IEC 9899; POSIX.1.
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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 (wcsncpy, (s1, s2, n),
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wchar_t *__restrict s1 _AND
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_CONST wchar_t *__restrict s2 _AND
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size_t n)
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{
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wchar_t *dscan=s1;
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while(n > 0)
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{
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--n;
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if((*dscan++ = *s2++) == L'\0') break;
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}
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while(n-- > 0) *dscan++ = L'\0';
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return s1;
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}
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