3 * Copyright (C) 2001-2004 A.J. van Os; Released under GPL
5 *====================================================================
6 * This part of the software is based on:
7 * An implementation of wcwidth() as defined in
8 * "The Single UNIX Specification, Version 2, The Open Group, 1997"
9 * <http://www.UNIX-systems.org/online.html>
10 * Markus Kuhn -- 2001-01-12 -- public domain
11 *====================================================================
12 * The credit should go to him, but all the bugs are mine.
23 /* Sorted list of non-overlapping intervals of non-spacing characters */
24 static const struct interval combining
[] = {
25 { 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 },
26 { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
27 { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
28 { 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 },
29 { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
30 { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
31 { 0x07A6, 0x07B0 }, { 0x0901, 0x0902 }, { 0x093C, 0x093C },
32 { 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0954 },
33 { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC },
34 { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 },
35 { 0x0A02, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 },
36 { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 },
37 { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 },
38 { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 },
39 { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 },
40 { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 },
41 { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
42 { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
43 { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
44 { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA },
45 { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 },
46 { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 },
47 { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD },
48 { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 },
49 { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 },
50 { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC },
51 { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, { 0x1032, 0x1032 },
52 { 0x1036, 0x1037 }, { 0x1039, 0x1039 }, { 0x1058, 0x1059 },
53 { 0x1160, 0x11FF }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 },
54 { 0x17C9, 0x17D3 }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 },
55 { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x206A, 0x206F },
56 { 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
57 { 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF },
61 /* Auxiliary function for binary search in interval table */
63 bIsZeroWidthChar(ULONG ucs
)
66 int high
= elementsof(combining
) - 1;
69 if (ucs
< (ULONG
)combining
[low
].first
||
70 ucs
> (ULONG
)combining
[high
].last
) {
75 mid
= (low
+ high
) / 2;
76 if (ucs
> (ULONG
)combining
[mid
].last
) {
78 } else if (ucs
< (ULONG
)combining
[mid
].first
) {
85 } /* end of bIsZeroWidthChar */
87 /* The following functions define the column width of an ISO 10646
88 * character as follows:
90 * - The null character (U+0000) has a column width of 0.
92 * - Other C0/C1 control characters and DEL will lead to a return
95 * - Non-spacing and enclosing combining characters (general
96 * category code Mn or Me in the Unicode database) have a
99 * - Other format characters (general category code Cf in the Unicode
100 * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
102 * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
103 * have a column width of 0.
105 * - Spacing characters in the East Asian Wide (W) or East Asian
106 * FullWidth (F) category as defined in Unicode Technical
107 * Report #11 have a column width of 2.
109 * - All remaining characters (including all printable
110 * ISO 8859-1 and WGL4 characters, Unicode control characters,
111 * etc.) have a column width of 1.
113 * This implementation assumes that all characters are encoded
116 * This function is not named wcwidth() to prevent name clashes
121 /* Test for 8-bit control characters */
125 if (ucs
< 0x20 || (ucs
>= 0x7f && ucs
< 0xa0)) {
130 /* Binary search in table of non-spacing characters */
131 if (bIsZeroWidthChar(ucs
)) {
135 /* Ucs is not a combining or C0/C1 control character */
139 (ucs
<= 0x115f || /* Hangul Jamo init. consonants */
140 (ucs
>= 0x2e80 && ucs
<= 0xa4cf && (ucs
& ~0x0011) != 0x300a &&
141 ucs
!= 0x303f) || /* CJK ... Yi */
142 (ucs
>= 0xac00 && ucs
<= 0xd7a3) || /* Hangul Syllables */
143 (ucs
>= 0xf900 && ucs
<= 0xfaff) || /* CJK Compatibility Ideographs */
144 (ucs
>= 0xfe30 && ucs
<= 0xfe6f) || /* CJK Compatibility Forms */
145 (ucs
>= 0xff00 && ucs
<= 0xff5f) || /* Fullwidth Forms */
146 (ucs
>= 0xffe0 && ucs
<= 0xffe6) ||
147 (ucs
>= 0x20000 && ucs
<= 0x2ffff)));
148 } /* end of iWcWidth */
151 * utf8_to_ucs - convert from UTF-8 to UCS
153 * Returns the UCS character,
154 * Fills in the number of bytes in the UTF-8 character
157 utf8_to_ucs(const char *p
, int iStrLen
, int *piUtfLen
)
160 int iIndex
, iCharLen
;
162 fail(p
== NULL
|| piUtfLen
== NULL
);
165 ulUcs
= (ULONG
)(UCHAR
)p
[0];
175 } else if (ulUcs
< 0xf0){
178 } else if (ulUcs
< 0xf8){
181 } else if (ulUcs
< 0xfc){
188 for (iIndex
= 1; iIndex
< iCharLen
; iIndex
++) {
190 if (iIndex
< iStrLen
) {
191 ulUcs
|= (ULONG
)(UCHAR
)p
[iIndex
] & 0x3f;
194 *piUtfLen
= iCharLen
;
196 } /* end of utf8_to_ucs */
199 * utf8_strwidth - compute the string width of an UTF-8 string
201 * Returns the string width in columns
204 utf8_strwidth(const char *pcString
, size_t tNumchars
)
208 int iToGo
, iWidth
, iUtflen
;
210 fail(pcString
== NULL
|| tNumchars
> (size_t)INT_MAX
);
213 iToGo
= (int)tNumchars
;
215 while (iToGo
> 0 && *pcString
!= '\0') {
216 ulUcs
= utf8_to_ucs(pcString
, iToGo
, &iUtflen
);
217 iWidth
= iWcWidth(ulUcs
);
226 } /* end of utf8_strwidth */
229 * utf8_chrlength - get the number of bytes in an UTF-8 character
231 * Returns the number of bytes
234 utf8_chrlength(const char *p
)
240 iUtflen
= -1; /* Just to make sure */
241 (void)utf8_to_ucs(p
, INT_MAX
, &iUtflen
);
244 } /* end of utf8_chrlength */
247 * is_locale_utf8 - return TRUE if the locale is UTF-8
255 if (!bGetNormalizedCodeset(szCodeset
, sizeof(szCodeset
), NULL
)) {
259 return STREQ(szCodeset
, "utf8");
260 } /* end of is_locale_utf8 */