1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
/*
* Copyright (C) 2017 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <wchar.h>
#include "private/icu.h"
int wcwidth(wchar_t wc) {
// Fast-path ASCII.
if (wc >= 0x20 && wc < 0x7f) return 1;
// ASCII NUL is a special case.
if (wc == 0) return 0;
// C0.
if (wc < ' ' || (wc >= 0x7f && wc <= 0xa0)) return -1;
// Now for the i18n part. This isn't defined or standardized, so a lot of the choices are
// pretty arbitrary. See https://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c for more details.
// Fancy unicode control characters?
switch (__icu_charType(wc)) {
case -1:
// No icu4c available; give up.
return -1;
case U_CONTROL_CHAR:
return -1;
case U_NON_SPACING_MARK:
case U_ENCLOSING_MARK:
case U_FORMAT_CHAR:
return 0;
}
if (__icu_hasBinaryProperty(wc, UCHAR_DEFAULT_IGNORABLE_CODE_POINT, nullptr)) return 0;
// Medial and final jamo render as zero width when used correctly.
switch (__icu_getIntPropertyValue(wc, UCHAR_HANGUL_SYLLABLE_TYPE)) {
case U_HST_VOWEL_JAMO:
case U_HST_TRAILING_JAMO:
return 0;
case U_HST_LEADING_JAMO:
case U_HST_LV_SYLLABLE:
case U_HST_LVT_SYLLABLE:
return 2;
}
if (wc >= 0x3248 && wc <= 0x4dff) {
// Circled two-digit CJK "speed sign" numbers. EastAsianWidth is ambiguous,
// but wide makes more sense.
if (wc <= 0x324f) return 2;
// Hexagrams. EastAsianWidth is neutral, but wide seems better.
if (wc >= 0x4dc0) return 2;
}
// The EastAsianWidth property is at least defined by the Unicode standard!
switch (__icu_getIntPropertyValue(wc, UCHAR_EAST_ASIAN_WIDTH)) {
case U_EA_AMBIGUOUS:
case U_EA_HALFWIDTH:
case U_EA_NARROW:
case U_EA_NEUTRAL:
return 1;
case U_EA_FULLWIDTH:
case U_EA_WIDE:
return 2;
}
return 0;
}
|
