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* libc/string/wcwidth.c: Optimize for speed.

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* libc/locale/locale.c (lc_ctype_cjk_lang): New static int.
	(loadlocale): In case of setting LC_CTYPE, set lc_ctype_cjk_lang
	to 1 if the language is "jp", "ko", or "zh", to 0 otherwise.
	(__locale_cjk_lang): New function.
	* libc/string/local.h (__locale_cjk_lang): Declare.
	* libc/string/wcwidth.c: Fix comments.
	(__wcwidth): Handle CJK Ambiguous Width characters according
	to setting returned by __locale_cjk_lang.
This commit is contained in:
Corinna Vinschen
2009-06-03 19:28:22 +00:00
parent b8c9d44669
commit c801709ed5
4 changed files with 112 additions and 4 deletions
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15
newlib/ChangeLog
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@ -1,3 +1,18 @@
2009-06-03 IWAMURO Motonori <deenheart@gmail.com>
* libc/string/wcwidth.c: Optimize for speed.
2009-06-03 Corinna Vinschen <corinna@vinschen.de>
* libc/locale/locale.c (lc_ctype_cjk_lang): New static int.
(loadlocale): In case of setting LC_CTYPE, set lc_ctype_cjk_lang
to 1 if the language is "jp", "ko", or "zh", to 0 otherwise.
(__locale_cjk_lang): New function.
* libc/string/local.h (__locale_cjk_lang): Declare.
* libc/string/wcwidth.c: Fix comments.
(__wcwidth): Handle CJK Ambiguous Width characters according
to setting returned by __locale_cjk_lang.
2009-06-02 Richard Earnshaw <rearnsha@arm.com>
* libc/include/sys/config.h: Remove specification of _REENT_SMALL for

15
newlib/libc/locale/locale.c
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@ -204,6 +204,7 @@ static const char *__get_locale_env(struct _reent *, int);
static char lc_ctype_charset[ENCODING_LEN + 1] = "ASCII";
static char lc_message_charset[ENCODING_LEN + 1] = "ASCII";
static int lc_ctype_cjk_lang = 0;
char *
_DEFUN(_setlocale_r, (p, category, locale),
@ -602,6 +603,14 @@ loadlocale(struct _reent *p, int category)
__wctomb = l_wctomb;
__mbtowc = l_mbtowc;
__set_ctype (charset);
/* Check for the language part of the locale specifier. In case
of "ja", "ko", or "zh", assume the use of CJK fonts. This is
stored in lc_ctype_cjk_lang and tested in wcwidth() to figure
out the width to return (1 or 2) for the "CJK Ambiguous Width"
category of characters. */
lc_ctype_cjk_lang = (strncmp (locale, "ja", 2) == 0
|| strncmp (locale, "ko", 2) == 0
|| strncmp (locale, "zh", 2) == 0);
#endif
}
else if (category == LC_MESSAGES)
@ -645,6 +654,12 @@ _DEFUN_VOID(__locale_msgcharset)
return lc_message_charset;
}
int
_DEFUN_VOID(__locale_cjk_lang)
{
return lc_ctype_cjk_lang;
}
struct lconv *
_DEFUN(_localeconv_r, (data),
struct _reent *data)

4
newlib/libc/string/local.h
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@ -3,3 +3,7 @@
/* internal function to compute width of wide char. */
int _EXFUN (__wcwidth, (wint_t));
/* Defined in locale/locale.c. Returns a value != 0 if the current
language is assumed to use CJK fonts. */
int __locale_cjk_lang ();

82
newlib/libc/string/wcwidth.c
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@ -127,7 +127,7 @@ bisearch(wint_t ucs, const struct interval *table, int max)
}
#endif /* _MB_CAPABLE */
/* The following two functions define the column width of an ISO 10646
/* The following function defines the column width of an ISO 10646
* character as follows:
*
* - The null character (U+0000) has a column width of 0.
@ -135,6 +135,11 @@ bisearch(wint_t ucs, const struct interval *table, int max)
* - Other C0/C1 control characters and DEL will lead to a return
* value of -1.
*
* - If the current language is recognized as a language usually using
* CJK fonts, spacing characters in the East Asian Ambiguous (A)
* category as defined in Unicode Technical Report #11 have a column
* width of 2.
*
* - Non-spacing and enclosing combining characters (general
* category code Mn or Me in the Unicode database) have a
* column width of 0.
@ -155,7 +160,7 @@ bisearch(wint_t ucs, const struct interval *table, int max)
* ISO 8859-1 and WGL4 characters, Unicode control characters,
* etc.) have a column width of 1.
*
* This implementation assumes that wchar_t characters are encoded
* This implementation assumes that wint_t characters are encoded
* in ISO 10646.
*/
@ -164,6 +169,62 @@ _DEFUN (__wcwidth, (ucs),
_CONST wint_t ucs)
{
#ifdef _MB_CAPABLE
/* sorted list of non-overlapping intervals of East Asian Ambiguous
* characters, generated by "uniset +WIDTH-A -cat=Me -cat=Mn -cat=Cf c" */
static const struct interval ambiguous[] = {
{ 0x00A1, 0x00A1 }, { 0x00A4, 0x00A4 }, { 0x00A7, 0x00A8 },
{ 0x00AA, 0x00AA }, { 0x00AE, 0x00AE }, { 0x00B0, 0x00B4 },
{ 0x00B6, 0x00BA }, { 0x00BC, 0x00BF }, { 0x00C6, 0x00C6 },
{ 0x00D0, 0x00D0 }, { 0x00D7, 0x00D8 }, { 0x00DE, 0x00E1 },
{ 0x00E6, 0x00E6 }, { 0x00E8, 0x00EA }, { 0x00EC, 0x00ED },
{ 0x00F0, 0x00F0 }, { 0x00F2, 0x00F3 }, { 0x00F7, 0x00FA },
{ 0x00FC, 0x00FC }, { 0x00FE, 0x00FE }, { 0x0101, 0x0101 },
{ 0x0111, 0x0111 }, { 0x0113, 0x0113 }, { 0x011B, 0x011B },
{ 0x0126, 0x0127 }, { 0x012B, 0x012B }, { 0x0131, 0x0133 },
{ 0x0138, 0x0138 }, { 0x013F, 0x0142 }, { 0x0144, 0x0144 },
{ 0x0148, 0x014B }, { 0x014D, 0x014D }, { 0x0152, 0x0153 },
{ 0x0166, 0x0167 }, { 0x016B, 0x016B }, { 0x01CE, 0x01CE },
{ 0x01D0, 0x01D0 }, { 0x01D2, 0x01D2 }, { 0x01D4, 0x01D4 },
{ 0x01D6, 0x01D6 }, { 0x01D8, 0x01D8 }, { 0x01DA, 0x01DA },
{ 0x01DC, 0x01DC }, { 0x0251, 0x0251 }, { 0x0261, 0x0261 },
{ 0x02C4, 0x02C4 }, { 0x02C7, 0x02C7 }, { 0x02C9, 0x02CB },
{ 0x02CD, 0x02CD }, { 0x02D0, 0x02D0 }, { 0x02D8, 0x02DB },
{ 0x02DD, 0x02DD }, { 0x02DF, 0x02DF }, { 0x0391, 0x03A1 },
{ 0x03A3, 0x03A9 }, { 0x03B1, 0x03C1 }, { 0x03C3, 0x03C9 },
{ 0x0401, 0x0401 }, { 0x0410, 0x044F }, { 0x0451, 0x0451 },
{ 0x2010, 0x2010 }, { 0x2013, 0x2016 }, { 0x2018, 0x2019 },
{ 0x201C, 0x201D }, { 0x2020, 0x2022 }, { 0x2024, 0x2027 },
{ 0x2030, 0x2030 }, { 0x2032, 0x2033 }, { 0x2035, 0x2035 },
{ 0x203B, 0x203B }, { 0x203E, 0x203E }, { 0x2074, 0x2074 },
{ 0x207F, 0x207F }, { 0x2081, 0x2084 }, { 0x20AC, 0x20AC },
{ 0x2103, 0x2103 }, { 0x2105, 0x2105 }, { 0x2109, 0x2109 },
{ 0x2113, 0x2113 }, { 0x2116, 0x2116 }, { 0x2121, 0x2122 },
{ 0x2126, 0x2126 }, { 0x212B, 0x212B }, { 0x2153, 0x2154 },
{ 0x215B, 0x215E }, { 0x2160, 0x216B }, { 0x2170, 0x2179 },
{ 0x2190, 0x2199 }, { 0x21B8, 0x21B9 }, { 0x21D2, 0x21D2 },
{ 0x21D4, 0x21D4 }, { 0x21E7, 0x21E7 }, { 0x2200, 0x2200 },
{ 0x2202, 0x2203 }, { 0x2207, 0x2208 }, { 0x220B, 0x220B },
{ 0x220F, 0x220F }, { 0x2211, 0x2211 }, { 0x2215, 0x2215 },
{ 0x221A, 0x221A }, { 0x221D, 0x2220 }, { 0x2223, 0x2223 },
{ 0x2225, 0x2225 }, { 0x2227, 0x222C }, { 0x222E, 0x222E },
{ 0x2234, 0x2237 }, { 0x223C, 0x223D }, { 0x2248, 0x2248 },
{ 0x224C, 0x224C }, { 0x2252, 0x2252 }, { 0x2260, 0x2261 },
{ 0x2264, 0x2267 }, { 0x226A, 0x226B }, { 0x226E, 0x226F },
{ 0x2282, 0x2283 }, { 0x2286, 0x2287 }, { 0x2295, 0x2295 },
{ 0x2299, 0x2299 }, { 0x22A5, 0x22A5 }, { 0x22BF, 0x22BF },
{ 0x2312, 0x2312 }, { 0x2460, 0x24E9 }, { 0x24EB, 0x254B },
{ 0x2550, 0x2573 }, { 0x2580, 0x258F }, { 0x2592, 0x2595 },
{ 0x25A0, 0x25A1 }, { 0x25A3, 0x25A9 }, { 0x25B2, 0x25B3 },
{ 0x25B6, 0x25B7 }, { 0x25BC, 0x25BD }, { 0x25C0, 0x25C1 },
{ 0x25C6, 0x25C8 }, { 0x25CB, 0x25CB }, { 0x25CE, 0x25D1 },
{ 0x25E2, 0x25E5 }, { 0x25EF, 0x25EF }, { 0x2605, 0x2606 },
{ 0x2609, 0x2609 }, { 0x260E, 0x260F }, { 0x2614, 0x2615 },
{ 0x261C, 0x261C }, { 0x261E, 0x261E }, { 0x2640, 0x2640 },
{ 0x2642, 0x2642 }, { 0x2660, 0x2661 }, { 0x2663, 0x2665 },
{ 0x2667, 0x266A }, { 0x266C, 0x266D }, { 0x266F, 0x266F },
{ 0x273D, 0x273D }, { 0x2776, 0x277F }, { 0xE000, 0xF8FF },
{ 0xFFFD, 0xFFFD }, { 0xF0000, 0xFFFFD }, { 0x100000, 0x10FFFD }
};
/* sorted list of non-overlapping intervals of non-spacing characters */
/* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
static const struct interval combining[] = {
@ -217,15 +278,28 @@ _DEFUN (__wcwidth, (ucs),
{ 0xE0100, 0xE01EF }
};
/* test for 8-bit control characters */
/* Test for NUL character */
if (ucs == 0)
return 0;
if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
/* Test for printable ASCII characters */
if (ucs >= 0x20 && ucs < 0x7f)
return 1;
/* Test for control characters */
if (ucs < 0xa0)
return -1;
/* Test for surrogate pair values. */
if (ucs >= 0xd800 && ucs <= 0xdfff)
return -1;
/* binary search in table of ambiguous characters */
if (__locale_cjk_lang ()
&& bisearch(ucs, ambiguous,
sizeof(ambiguous) / sizeof(struct interval) - 1))
return 2;
/* binary search in table of non-spacing characters */
if (bisearch(ucs, combining,
sizeof(combining) / sizeof(struct interval) - 1))