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[/] [openrisc/] [tags/] [gnu-src/] [newlib-1.18.0/] [newlib-1.18.0-or32-1.0rc1/] [newlib/] [libc/] [string/] [wcswidth.c] - Rev 345
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/* FUNCTION <<wcswidth>>---number of column positions of a wide-character string INDEX wcswidth ANSI_SYNOPSIS #include <wchar.h> int wcswidth(const wchar_t *<[pwcs]>, size_t <[n]>); TRAD_SYNOPSIS #include <wchar.h> int wcswidth(<[pwcs]>, <[n]>) wchar_t *<[wc]>; size_t <[n]>; DESCRIPTION The <<wcswidth>> function shall determine the number of column positions required for <[n]> wide-character codes (or fewer than <[n]> wide-character codes if a null wide-character code is encountered before <[n]> wide-character codes are exhausted) in the string pointed to by <[pwcs]>. RETURNS The <<wcswidth>> function either shall return 0 (if <[pwcs]> points to a null wide-character code), or return the number of column positions to be occupied by the wide-character string pointed to by <[pwcs]>, or return -1 (if any of the first <[n]> wide-character codes in the wide-character string pointed to by <[pwcs]> is not a printable wide-character code). PORTABILITY <<wcswidth>> has been introduced in the Single UNIX Specification Volume 2. <<wcswidth>> has been marked as an extension in the Single UNIX Specification Volume 3. */ #include <_ansi.h> #include <wchar.h> #include "local.h" int _DEFUN (wcswidth, (pwcs, n), _CONST wchar_t *pwcs _AND size_t n) { int w, len = 0; if (!pwcs || n == 0) return 0; do { wint_t wi = *pwcs; #ifdef _MB_CAPABLE wi = _jp2uc (wi); /* First half of a surrogate pair? */ if (sizeof (wchar_t) == 2 && wi >= 0xd800 && wi <= 0xdbff) { wint_t wi2; /* Extract second half and check for validity. */ if (--n == 0 || (wi2 = _jp2uc (*++pwcs)) < 0xdc00 || wi2 > 0xdfff) return -1; /* Compute actual unicode value to use in call to __wcwidth. */ wi = (((wi & 0x3ff) << 10) | (wi2 & 0x3ff)) + 0x10000; } #endif /* _MB_CAPABLE */ if ((w = __wcwidth (wi)) < 0) return -1; len += w; } while (*pwcs++ && --n > 0); return len; }