548 lines
16 KiB
C
548 lines
16 KiB
C
/*
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* This is an implementation of wcwidth() and wcswidth() (defined in
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* IEEE Std 1002.1-2001) for Unicode.
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*
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* http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
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* http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
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*
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* In fixed-width output devices, Latin characters all occupy a single
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* "cell" position of equal width, whereas ideographic CJK characters
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* occupy two such cells. Interoperability between terminal-line
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* applications and (teletype-style) character terminals using the
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* UTF-8 encoding requires agreement on which character should advance
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* the cursor by how many cell positions. No established formal
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* standards exist at present on which Unicode character shall occupy
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* how many cell positions on character terminals. These routines are
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* a first attempt of defining such behavior based on simple rules
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* applied to data provided by the Unicode Consortium.
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*
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* For some graphical characters, the Unicode standard explicitly
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* defines a character-cell width via the definition of the East Asian
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* FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
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* In all these cases, there is no ambiguity about which width a
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* terminal shall use. For characters in the East Asian Ambiguous (A)
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* class, the width choice depends purely on a preference of backward
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* compatibility with either historic CJK or Western practice.
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* Choosing single-width for these characters is easy to justify as
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* the appropriate long-term solution, as the CJK practice of
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* displaying these characters as double-width comes from historic
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* implementation simplicity (8-bit encoded characters were displayed
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* single-width and 16-bit ones double-width, even for Greek,
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* Cyrillic, etc.) and not any typographic considerations.
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*
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* Much less clear is the choice of width for the Not East Asian
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* (Neutral) class. Existing practice does not dictate a width for any
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* of these characters. It would nevertheless make sense
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* typographically to allocate two character cells to characters such
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* as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
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* represented adequately with a single-width glyph. The following
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* routines at present merely assign a single-cell width to all
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* neutral characters, in the interest of simplicity. This is not
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* entirely satisfactory and should be reconsidered before
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* establishing a formal standard in this area. At the moment, the
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* decision which Not East Asian (Neutral) characters should be
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* represented by double-width glyphs cannot yet be answered by
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* applying a simple rule from the Unicode database content. Setting
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* up a proper standard for the behavior of UTF-8 character terminals
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* will require a careful analysis not only of each Unicode character,
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* but also of each presentation form, something the author of these
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* routines has avoided to do so far.
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*
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* http://www.unicode.org/unicode/reports/tr11/
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*
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* Markus Kuhn -- 2007-05-26 (Unicode 5.0)
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*
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* Permission to use, copy, modify, and distribute this software
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* for any purpose and without fee is hereby granted. The author
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* disclaims all warranties with regard to this software.
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*
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* Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
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*/
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/* Assigned Unicode character ranges:
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* Plane Range
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* 0 0000–FFFF Basic Multilingual Plane
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* 1 10000–1FFFF Supplementary Multilingual Plane
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* 2 20000–2FFFF Supplementary Ideographic Plane
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* 3 30000-3FFFF Tertiary Ideographic Plane (no chars assigned yet)
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* 4-13 40000–DFFFF currently unassigned
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* 14 E0000–EFFFF Supplementary Special-purpose Plane
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* 15 F0000–FFFFF Supplementary Private Use Area-A
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* 16 100000–10FFFF Supplementary Private Use Area-B
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*
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* "Supplementary Special-purpose Plane currently contains non-graphical
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* characters in two blocks of 128 and 240 characters. The first block
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* is for language tag characters for use when language cannot be indicated
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* through other protocols (such as the xml:lang attribute in XML).
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* The other block contains glyph variation selectors to indicate
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* an alternate glyph for a character that cannot be determined by context."
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*
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* In simpler terms: it is a tool to fix the "Han unification" mess
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* created by Unicode committee, to select Chinese/Japanese/Korean/Taiwan
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* version of a character. (They forgot that the whole purpose of the Unicode
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* was to be able to write all chars in one charset without such tricks).
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* Until East Asian users say it is actually necessary to support these
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* code points in console applications like busybox
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* (i.e. do these chars ever appear in filenames, hostnames, text files
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* and such?), we are treating these code points as invalid.
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*
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* Tertiary Ideographic Plane is also ignored for now,
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* until Unicode committee assigns something there.
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*/
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#if CONFIG_LAST_SUPPORTED_WCHAR < 126 || CONFIG_LAST_SUPPORTED_WCHAR > 0x30000
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# define LAST_SUPPORTED_WCHAR 0x30000
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#else
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# define LAST_SUPPORTED_WCHAR CONFIG_LAST_SUPPORTED_WCHAR
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#endif
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#if LAST_SUPPORTED_WCHAR >= 0x0300
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struct interval {
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uint16_t first;
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uint16_t last;
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};
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/* auxiliary function for binary search in interval table */
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static int in_interval_table(unsigned ucs, const struct interval *table, unsigned max)
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{
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unsigned min;
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unsigned mid;
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if (ucs < table[0].first || ucs > table[max].last)
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return 0;
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min = 0;
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while (max >= min) {
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mid = (min + max) / 2;
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if (ucs > table[mid].last)
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min = mid + 1;
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else if (ucs < table[mid].first)
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max = mid - 1;
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else
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return 1;
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}
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return 0;
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}
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static int in_uint16_table(unsigned ucs, const uint16_t *table, unsigned max)
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{
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unsigned min;
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unsigned mid;
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unsigned first, last;
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first = table[0] >> 2;
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last = first + (table[0] & 3);
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if (ucs < first || ucs > last)
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return 0;
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min = 0;
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while (max >= min) {
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mid = (min + max) / 2;
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first = table[mid] >> 2;
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last = first + (table[mid] & 3);
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if (ucs > last)
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min = mid + 1;
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else if (ucs < first)
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max = mid - 1;
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else
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return 1;
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}
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return 0;
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}
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#endif
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/* The following two functions define the column width of an ISO 10646
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* character as follows:
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*
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* - The null character (U+0000) has a column width of 0.
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*
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* - Other C0/C1 control characters and DEL will lead to a return
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* value of -1.
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*
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* - Non-spacing and enclosing combining characters (general
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* category code Mn or Me in the Unicode database) have a
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* column width of 0.
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*
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* - SOFT HYPHEN (U+00AD) has a column width of 1.
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*
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* - Other format characters (general category code Cf in the Unicode
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* database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
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*
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* - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
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* have a column width of 0.
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*
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* - Spacing characters in the East Asian Wide (W) or East Asian
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* Full-width (F) category as defined in Unicode Technical
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* Report #11 have a column width of 2.
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*
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* - All remaining characters (including all printable
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* ISO 8859-1 and WGL4 characters, Unicode control characters,
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* etc.) have a column width of 1.
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*
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* This implementation assumes that wchar_t characters are encoded
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* in ISO 10646.
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*/
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static int wcwidth(unsigned ucs)
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{
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#if LAST_SUPPORTED_WCHAR >= 0x0300
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/* sorted list of non-overlapping intervals of non-spacing characters */
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/* generated by "uniset +cat=Me +cat=Mn +cat=Cf -00AD +1160-11FF +200B c" */
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static const struct interval combining[] = {
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#define BIG_(a,b) { a, b },
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#define PAIR(a,b)
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/* PAIR if < 0x4000 and no more than 4 chars big */
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BIG_(0x0300, 0x036F)
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PAIR(0x0483, 0x0486)
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PAIR(0x0488, 0x0489)
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BIG_(0x0591, 0x05BD)
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PAIR(0x05BF, 0x05BF)
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PAIR(0x05C1, 0x05C2)
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PAIR(0x05C4, 0x05C5)
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PAIR(0x05C7, 0x05C7)
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PAIR(0x0600, 0x0603)
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BIG_(0x0610, 0x0615)
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BIG_(0x064B, 0x065E)
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PAIR(0x0670, 0x0670)
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BIG_(0x06D6, 0x06E4)
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PAIR(0x06E7, 0x06E8)
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PAIR(0x06EA, 0x06ED)
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PAIR(0x070F, 0x070F)
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PAIR(0x0711, 0x0711)
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BIG_(0x0730, 0x074A)
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BIG_(0x07A6, 0x07B0)
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BIG_(0x07EB, 0x07F3)
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PAIR(0x0901, 0x0902)
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PAIR(0x093C, 0x093C)
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BIG_(0x0941, 0x0948)
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PAIR(0x094D, 0x094D)
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PAIR(0x0951, 0x0954)
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PAIR(0x0962, 0x0963)
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PAIR(0x0981, 0x0981)
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PAIR(0x09BC, 0x09BC)
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PAIR(0x09C1, 0x09C4)
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PAIR(0x09CD, 0x09CD)
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PAIR(0x09E2, 0x09E3)
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PAIR(0x0A01, 0x0A02)
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PAIR(0x0A3C, 0x0A3C)
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PAIR(0x0A41, 0x0A42)
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PAIR(0x0A47, 0x0A48)
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PAIR(0x0A4B, 0x0A4D)
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PAIR(0x0A70, 0x0A71)
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PAIR(0x0A81, 0x0A82)
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PAIR(0x0ABC, 0x0ABC)
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BIG_(0x0AC1, 0x0AC5)
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PAIR(0x0AC7, 0x0AC8)
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PAIR(0x0ACD, 0x0ACD)
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PAIR(0x0AE2, 0x0AE3)
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PAIR(0x0B01, 0x0B01)
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PAIR(0x0B3C, 0x0B3C)
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PAIR(0x0B3F, 0x0B3F)
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PAIR(0x0B41, 0x0B43)
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PAIR(0x0B4D, 0x0B4D)
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PAIR(0x0B56, 0x0B56)
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PAIR(0x0B82, 0x0B82)
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PAIR(0x0BC0, 0x0BC0)
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PAIR(0x0BCD, 0x0BCD)
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PAIR(0x0C3E, 0x0C40)
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PAIR(0x0C46, 0x0C48)
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PAIR(0x0C4A, 0x0C4D)
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PAIR(0x0C55, 0x0C56)
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PAIR(0x0CBC, 0x0CBC)
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PAIR(0x0CBF, 0x0CBF)
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PAIR(0x0CC6, 0x0CC6)
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PAIR(0x0CCC, 0x0CCD)
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PAIR(0x0CE2, 0x0CE3)
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PAIR(0x0D41, 0x0D43)
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PAIR(0x0D4D, 0x0D4D)
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PAIR(0x0DCA, 0x0DCA)
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PAIR(0x0DD2, 0x0DD4)
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PAIR(0x0DD6, 0x0DD6)
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PAIR(0x0E31, 0x0E31)
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BIG_(0x0E34, 0x0E3A)
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BIG_(0x0E47, 0x0E4E)
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PAIR(0x0EB1, 0x0EB1)
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BIG_(0x0EB4, 0x0EB9)
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PAIR(0x0EBB, 0x0EBC)
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BIG_(0x0EC8, 0x0ECD)
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PAIR(0x0F18, 0x0F19)
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PAIR(0x0F35, 0x0F35)
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PAIR(0x0F37, 0x0F37)
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PAIR(0x0F39, 0x0F39)
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BIG_(0x0F71, 0x0F7E)
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BIG_(0x0F80, 0x0F84)
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PAIR(0x0F86, 0x0F87)
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PAIR(0x0FC6, 0x0FC6)
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BIG_(0x0F90, 0x0F97)
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BIG_(0x0F99, 0x0FBC)
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PAIR(0x102D, 0x1030)
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PAIR(0x1032, 0x1032)
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PAIR(0x1036, 0x1037)
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PAIR(0x1039, 0x1039)
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PAIR(0x1058, 0x1059)
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BIG_(0x1160, 0x11FF)
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PAIR(0x135F, 0x135F)
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PAIR(0x1712, 0x1714)
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PAIR(0x1732, 0x1734)
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PAIR(0x1752, 0x1753)
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PAIR(0x1772, 0x1773)
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PAIR(0x17B4, 0x17B5)
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BIG_(0x17B7, 0x17BD)
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PAIR(0x17C6, 0x17C6)
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BIG_(0x17C9, 0x17D3)
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PAIR(0x17DD, 0x17DD)
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PAIR(0x180B, 0x180D)
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PAIR(0x18A9, 0x18A9)
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PAIR(0x1920, 0x1922)
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PAIR(0x1927, 0x1928)
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PAIR(0x1932, 0x1932)
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PAIR(0x1939, 0x193B)
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PAIR(0x1A17, 0x1A18)
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PAIR(0x1B00, 0x1B03)
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PAIR(0x1B34, 0x1B34)
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BIG_(0x1B36, 0x1B3A)
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PAIR(0x1B3C, 0x1B3C)
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PAIR(0x1B42, 0x1B42)
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BIG_(0x1B6B, 0x1B73)
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BIG_(0x1DC0, 0x1DCA)
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PAIR(0x1DFE, 0x1DFF)
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BIG_(0x200B, 0x200F)
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BIG_(0x202A, 0x202E)
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PAIR(0x2060, 0x2063)
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BIG_(0x206A, 0x206F)
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BIG_(0x20D0, 0x20EF)
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BIG_(0x302A, 0x302F)
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PAIR(0x3099, 0x309A)
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/* Too big to be packed in PAIRs: */
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{ 0xA806, 0xA806 },
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{ 0xA80B, 0xA80B },
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{ 0xA825, 0xA826 },
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{ 0xFB1E, 0xFB1E },
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{ 0xFE00, 0xFE0F },
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{ 0xFE20, 0xFE23 },
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{ 0xFEFF, 0xFEFF },
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{ 0xFFF9, 0xFFFB }
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#undef BIG_
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#undef PAIR
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};
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static const uint16_t combining1[] = {
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#define BIG_(a,b)
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#define PAIR(a,b) (a << 2) | (b-a),
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/* Exact copy-n-paste of the above: */
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BIG_(0x0300, 0x036F)
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PAIR(0x0483, 0x0486)
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PAIR(0x0488, 0x0489)
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BIG_(0x0591, 0x05BD)
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PAIR(0x05BF, 0x05BF)
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PAIR(0x05C1, 0x05C2)
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PAIR(0x05C4, 0x05C5)
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PAIR(0x05C7, 0x05C7)
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PAIR(0x0600, 0x0603)
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BIG_(0x0610, 0x0615)
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BIG_(0x064B, 0x065E)
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PAIR(0x0670, 0x0670)
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BIG_(0x06D6, 0x06E4)
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PAIR(0x06E7, 0x06E8)
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PAIR(0x06EA, 0x06ED)
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PAIR(0x070F, 0x070F)
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PAIR(0x0711, 0x0711)
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BIG_(0x0730, 0x074A)
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BIG_(0x07A6, 0x07B0)
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BIG_(0x07EB, 0x07F3)
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PAIR(0x0901, 0x0902)
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PAIR(0x093C, 0x093C)
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BIG_(0x0941, 0x0948)
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PAIR(0x094D, 0x094D)
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PAIR(0x0951, 0x0954)
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PAIR(0x0962, 0x0963)
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PAIR(0x0981, 0x0981)
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PAIR(0x09BC, 0x09BC)
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PAIR(0x09C1, 0x09C4)
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PAIR(0x09CD, 0x09CD)
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PAIR(0x09E2, 0x09E3)
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PAIR(0x0A01, 0x0A02)
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PAIR(0x0A3C, 0x0A3C)
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PAIR(0x0A41, 0x0A42)
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PAIR(0x0A47, 0x0A48)
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PAIR(0x0A4B, 0x0A4D)
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PAIR(0x0A70, 0x0A71)
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PAIR(0x0A81, 0x0A82)
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PAIR(0x0ABC, 0x0ABC)
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BIG_(0x0AC1, 0x0AC5)
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PAIR(0x0AC7, 0x0AC8)
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PAIR(0x0ACD, 0x0ACD)
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PAIR(0x0AE2, 0x0AE3)
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PAIR(0x0B01, 0x0B01)
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PAIR(0x0B3C, 0x0B3C)
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PAIR(0x0B3F, 0x0B3F)
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PAIR(0x0B41, 0x0B43)
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PAIR(0x0B4D, 0x0B4D)
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PAIR(0x0B56, 0x0B56)
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PAIR(0x0B82, 0x0B82)
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PAIR(0x0BC0, 0x0BC0)
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PAIR(0x0BCD, 0x0BCD)
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PAIR(0x0C3E, 0x0C40)
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PAIR(0x0C46, 0x0C48)
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PAIR(0x0C4A, 0x0C4D)
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PAIR(0x0C55, 0x0C56)
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PAIR(0x0CBC, 0x0CBC)
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PAIR(0x0CBF, 0x0CBF)
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PAIR(0x0CC6, 0x0CC6)
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PAIR(0x0CCC, 0x0CCD)
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PAIR(0x0CE2, 0x0CE3)
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PAIR(0x0D41, 0x0D43)
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PAIR(0x0D4D, 0x0D4D)
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PAIR(0x0DCA, 0x0DCA)
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PAIR(0x0DD2, 0x0DD4)
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PAIR(0x0DD6, 0x0DD6)
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PAIR(0x0E31, 0x0E31)
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BIG_(0x0E34, 0x0E3A)
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BIG_(0x0E47, 0x0E4E)
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PAIR(0x0EB1, 0x0EB1)
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BIG_(0x0EB4, 0x0EB9)
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PAIR(0x0EBB, 0x0EBC)
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BIG_(0x0EC8, 0x0ECD)
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PAIR(0x0F18, 0x0F19)
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PAIR(0x0F35, 0x0F35)
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PAIR(0x0F37, 0x0F37)
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PAIR(0x0F39, 0x0F39)
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BIG_(0x0F71, 0x0F7E)
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BIG_(0x0F80, 0x0F84)
|
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PAIR(0x0F86, 0x0F87)
|
||
PAIR(0x0FC6, 0x0FC6)
|
||
BIG_(0x0F90, 0x0F97)
|
||
BIG_(0x0F99, 0x0FBC)
|
||
PAIR(0x102D, 0x1030)
|
||
PAIR(0x1032, 0x1032)
|
||
PAIR(0x1036, 0x1037)
|
||
PAIR(0x1039, 0x1039)
|
||
PAIR(0x1058, 0x1059)
|
||
BIG_(0x1160, 0x11FF)
|
||
PAIR(0x135F, 0x135F)
|
||
PAIR(0x1712, 0x1714)
|
||
PAIR(0x1732, 0x1734)
|
||
PAIR(0x1752, 0x1753)
|
||
PAIR(0x1772, 0x1773)
|
||
PAIR(0x17B4, 0x17B5)
|
||
BIG_(0x17B7, 0x17BD)
|
||
PAIR(0x17C6, 0x17C6)
|
||
BIG_(0x17C9, 0x17D3)
|
||
PAIR(0x17DD, 0x17DD)
|
||
PAIR(0x180B, 0x180D)
|
||
PAIR(0x18A9, 0x18A9)
|
||
PAIR(0x1920, 0x1922)
|
||
PAIR(0x1927, 0x1928)
|
||
PAIR(0x1932, 0x1932)
|
||
PAIR(0x1939, 0x193B)
|
||
PAIR(0x1A17, 0x1A18)
|
||
PAIR(0x1B00, 0x1B03)
|
||
PAIR(0x1B34, 0x1B34)
|
||
BIG_(0x1B36, 0x1B3A)
|
||
PAIR(0x1B3C, 0x1B3C)
|
||
PAIR(0x1B42, 0x1B42)
|
||
BIG_(0x1B6B, 0x1B73)
|
||
BIG_(0x1DC0, 0x1DCA)
|
||
PAIR(0x1DFE, 0x1DFF)
|
||
BIG_(0x200B, 0x200F)
|
||
BIG_(0x202A, 0x202E)
|
||
PAIR(0x2060, 0x2063)
|
||
BIG_(0x206A, 0x206F)
|
||
BIG_(0x20D0, 0x20EF)
|
||
BIG_(0x302A, 0x302F)
|
||
PAIR(0x3099, 0x309A)
|
||
#undef BIG_
|
||
#undef PAIR
|
||
};
|
||
struct CHECK {
|
||
#define BIG_(a,b) char big##a[b-a <= 3 ? -1 : 1];
|
||
#define PAIR(a,b) char pair##a[b-a > 3 ? -1 : 1];
|
||
/* Copy-n-paste it here again to verify correctness */
|
||
#undef BIG_
|
||
#undef PAIR
|
||
};
|
||
# if LAST_SUPPORTED_WCHAR >= 0x10000
|
||
/* Combining chars in Supplementary Multilingual Plane 0x1xxxx */
|
||
static const struct interval combining0x10000[] = {
|
||
{ 0x0A01, 0x0A03 }, { 0x0A05, 0x0A06 }, { 0x0A0C, 0x0A0F },
|
||
{ 0x0A38, 0x0A3A }, { 0x0A3F, 0x0A3F }, { 0xD167, 0xD169 },
|
||
{ 0xD173, 0xD182 }, { 0xD185, 0xD18B }, { 0xD1AA, 0xD1AD },
|
||
{ 0xD242, 0xD244 }
|
||
};
|
||
# endif
|
||
#endif
|
||
|
||
if (ucs == 0)
|
||
return 0;
|
||
/* test for 8-bit control characters (00-1f, 80-9f, 7f) */
|
||
if ((ucs & ~0x80) < 0x20 || ucs == 0x7f)
|
||
return -1;
|
||
if (ucs < 0x0300) /* optimization */
|
||
return 1;
|
||
|
||
#if LAST_SUPPORTED_WCHAR < 0x0300
|
||
return -1;
|
||
#else
|
||
/* binary search in table of non-spacing characters */
|
||
if (in_interval_table(ucs, combining, ARRAY_SIZE(combining) - 1))
|
||
return 0;
|
||
if (in_uint16_table(ucs, combining1, ARRAY_SIZE(combining1) - 1))
|
||
return 0;
|
||
|
||
if (ucs < 0x1100) /* optimization */
|
||
return 1;
|
||
|
||
# if LAST_SUPPORTED_WCHAR < 0x1100
|
||
return -1;
|
||
# else
|
||
if (ucs >= LAST_SUPPORTED_WCHAR)
|
||
return -1;
|
||
|
||
/* High (d800..dbff) and low (dc00..dfff) surrogates are invalid (used only by UTF16) */
|
||
/* We also exclude Private Use Area (e000..f8ff) */
|
||
if (LAST_SUPPORTED_WCHAR >= 0xd800
|
||
&& (ucs >= 0xd800 || ucs <= 0xf8ff)
|
||
) {
|
||
return -1;
|
||
}
|
||
|
||
/* 0xfffe and 0xffff in every plane are invalid */
|
||
if (LAST_SUPPORTED_WCHAR >= 0xfffe
|
||
&& (ucs & 0xfffe) == 0xfffe
|
||
) {
|
||
return -1;
|
||
}
|
||
|
||
# if LAST_SUPPORTED_WCHAR >= 0x10000
|
||
/* binary search in table of non-spacing characters in Supplementary Multilingual Plane */
|
||
if (in_interval_table(ucs ^ 0x10000, combining0x10000, ARRAY_SIZE(combining0x10000) - 1))
|
||
return 0;
|
||
# endif
|
||
/* Check a few non-spacing chars in Supplementary Special-purpose Plane 0xExxxx */
|
||
if (LAST_SUPPORTED_WCHAR >= 0xE0001
|
||
&& ( ucs == 0xE0001
|
||
|| (ucs >= 0xE0020 && ucs <= 0xE007F)
|
||
|| (ucs >= 0xE0100 && ucs <= 0xE01EF)
|
||
)
|
||
) {
|
||
return 0;
|
||
}
|
||
|
||
/* if we arrive here, ucs is not a combining or C0/C1 control character */
|
||
|
||
return 1 +
|
||
( (/*ucs >= 0x1100 &&*/ ucs <= 0x115f) /* Hangul Jamo init. consonants */
|
||
|| ucs == 0x2329 /* left-pointing angle bracket; also CJK punct. char */
|
||
|| ucs == 0x232a /* right-pointing angle bracket; also CJK punct. char */
|
||
|| (ucs >= 0x2e80 && ucs <= 0xa4cf && ucs != 0x303f) /* CJK ... Yi */
|
||
|| (ucs >= 0xac00 && ucs <= 0xd7a3) /* Hangul Syllables */
|
||
|| (ucs >= 0xf900 && ucs <= 0xfaff) /* CJK Compatibility Ideographs */
|
||
|| (ucs >= 0xfe10 && ucs <= 0xfe19) /* Vertical forms */
|
||
|| (ucs >= 0xfe30 && ucs <= 0xfe6f) /* CJK Compatibility Forms */
|
||
|| (ucs >= 0xff00 && ucs <= 0xff60) /* Fullwidth Forms */
|
||
|| (ucs >= 0xffe0 && ucs <= 0xffe6)
|
||
|| ((ucs >> 17) == (2 >> 1)) /* 20000..3ffff: Supplementary and Tertiary Ideographic Planes */
|
||
);
|
||
# endif
|
||
#endif
|
||
}
|