+++ /dev/null
-/*
- * This is an implementation of wcwidth() and wcswidth() (defined in
- * IEEE Std 1002.1-2001) for Unicode.
- *
- * http://www.opengroup.org/onlinepubs/007904975/functions/wcwidth.html
- * http://www.opengroup.org/onlinepubs/007904975/functions/wcswidth.html
- *
- * In fixed-width output devices, Latin characters all occupy a single
- * "cell" position of equal width, whereas ideographic CJK characters
- * occupy two such cells. Interoperability between terminal-line
- * applications and (teletype-style) character terminals using the
- * UTF-8 encoding requires agreement on which character should advance
- * the cursor by how many cell positions. No established formal
- * standards exist at present on which Unicode character shall occupy
- * how many cell positions on character terminals. These routines are
- * a first attempt of defining such behavior based on simple rules
- * applied to data provided by the Unicode Consortium.
- *
- * For some graphical characters, the Unicode standard explicitly
- * defines a character-cell width via the definition of the East Asian
- * FullWidth (F), Wide (W), Half-width (H), and Narrow (Na) classes.
- * In all these cases, there is no ambiguity about which width a
- * terminal shall use. For characters in the East Asian Ambiguous (A)
- * class, the width choice depends purely on a preference of backward
- * compatibility with either historic CJK or Western practice.
- * Choosing single-width for these characters is easy to justify as
- * the appropriate long-term solution, as the CJK practice of
- * displaying these characters as double-width comes from historic
- * implementation simplicity (8-bit encoded characters were displayed
- * single-width and 16-bit ones double-width, even for Greek,
- * Cyrillic, etc.) and not any typographic considerations.
- *
- * Much less clear is the choice of width for the Not East Asian
- * (Neutral) class. Existing practice does not dictate a width for any
- * of these characters. It would nevertheless make sense
- * typographically to allocate two character cells to characters such
- * as for instance EM SPACE or VOLUME INTEGRAL, which cannot be
- * represented adequately with a single-width glyph. The following
- * routines at present merely assign a single-cell width to all
- * neutral characters, in the interest of simplicity. This is not
- * entirely satisfactory and should be reconsidered before
- * establishing a formal standard in this area. At the moment, the
- * decision which Not East Asian (Neutral) characters should be
- * represented by double-width glyphs cannot yet be answered by
- * applying a simple rule from the Unicode database content. Setting
- * up a proper standard for the behavior of UTF-8 character terminals
- * will require a careful analysis not only of each Unicode character,
- * but also of each presentation form, something the author of these
- * routines has avoided to do so far.
- *
- * http://www.unicode.org/unicode/reports/tr11/
- *
- * Markus Kuhn -- 2003-05-20 (Unicode 4.0)
- *
- * Permission to use, copy, modify, and distribute this software
- * for any purpose and without fee is hereby granted. The author
- * disclaims all warranties with regard to this software.
- *
- * Latest version: http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c
- */
-
-#if HAVE_CONFIG_H
-# include "config.h"
-#endif
-
-#ifndef HAVE_WC_FUNCS
-
-#include "mutt.h"
-#include "mbyte.h"
-
-#include <ctype.h>
-
-struct interval {
- int first;
- int last;
-};
-
-/* auxiliary function for binary search in interval table */
-static int bisearch (wchar_t ucs, const struct interval *table, int max)
-{
- int min = 0;
- int mid;
-
- if (ucs < table[0].first || ucs > table[max].last)
- return 0;
- while (max >= min) {
- mid = (min + max) / 2;
- if (ucs > table[mid].last)
- min = mid + 1;
- else if (ucs < table[mid].first)
- max = mid - 1;
- else
- return 1;
- }
-
- return 0;
-}
-
-
-/* The following two functions define the column width of an ISO 10646
- * character as follows:
- *
- * - The null character (U+0000) has a column width of 0.
- *
- * - Other C0/C1 control characters and DEL will lead to a return
- * value of -1.
- *
- * - Non-spacing and enclosing combining characters (general
- * category code Mn or Me in the Unicode database) have a
- * column width of 0.
- *
- * - SOFT HYPHEN (U+00AD) has a column width of 1.
- *
- * - Other format characters (general category code Cf in the Unicode
- * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
- *
- * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
- * have a column width of 0.
- *
- * - Spacing characters in the East Asian Wide (W) or East Asian
- * Full-width (F) category as defined in Unicode Technical
- * Report #11 have a column width of 2.
- *
- * - All remaining characters (including all printable
- * 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
- * in ISO 10646.
- */
-
-int wcwidth_ucs (wchar_t ucs)
-{
- /* 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[] = {
- {0x0300, 0x0357}, {0x035D, 0x036F}, {0x0483, 0x0486},
- {0x0488, 0x0489}, {0x0591, 0x05A1}, {0x05A3, 0x05B9},
- {0x05BB, 0x05BD}, {0x05BF, 0x05BF}, {0x05C1, 0x05C2},
- {0x05C4, 0x05C4}, {0x0600, 0x0603}, {0x0610, 0x0615},
- {0x064B, 0x0658}, {0x0670, 0x0670}, {0x06D6, 0x06E4},
- {0x06E7, 0x06E8}, {0x06EA, 0x06ED}, {0x070F, 0x070F},
- {0x0711, 0x0711}, {0x0730, 0x074A}, {0x07A6, 0x07B0},
- {0x0901, 0x0902}, {0x093C, 0x093C}, {0x0941, 0x0948},
- {0x094D, 0x094D}, {0x0951, 0x0954}, {0x0962, 0x0963},
- {0x0981, 0x0981}, {0x09BC, 0x09BC}, {0x09C1, 0x09C4},
- {0x09CD, 0x09CD}, {0x09E2, 0x09E3}, {0x0A01, 0x0A02},
- {0x0A3C, 0x0A3C}, {0x0A41, 0x0A42}, {0x0A47, 0x0A48},
- {0x0A4B, 0x0A4D}, {0x0A70, 0x0A71}, {0x0A81, 0x0A82},
- {0x0ABC, 0x0ABC}, {0x0AC1, 0x0AC5}, {0x0AC7, 0x0AC8},
- {0x0ACD, 0x0ACD}, {0x0AE2, 0x0AE3}, {0x0B01, 0x0B01},
- {0x0B3C, 0x0B3C}, {0x0B3F, 0x0B3F}, {0x0B41, 0x0B43},
- {0x0B4D, 0x0B4D}, {0x0B56, 0x0B56}, {0x0B82, 0x0B82},
- {0x0BC0, 0x0BC0}, {0x0BCD, 0x0BCD}, {0x0C3E, 0x0C40},
- {0x0C46, 0x0C48}, {0x0C4A, 0x0C4D}, {0x0C55, 0x0C56},
- {0x0CBC, 0x0CBC}, {0x0CBF, 0x0CBF}, {0x0CC6, 0x0CC6},
- {0x0CCC, 0x0CCD}, {0x0D41, 0x0D43}, {0x0D4D, 0x0D4D},
- {0x0DCA, 0x0DCA}, {0x0DD2, 0x0DD4}, {0x0DD6, 0x0DD6},
- {0x0E31, 0x0E31}, {0x0E34, 0x0E3A}, {0x0E47, 0x0E4E},
- {0x0EB1, 0x0EB1}, {0x0EB4, 0x0EB9}, {0x0EBB, 0x0EBC},
- {0x0EC8, 0x0ECD}, {0x0F18, 0x0F19}, {0x0F35, 0x0F35},
- {0x0F37, 0x0F37}, {0x0F39, 0x0F39}, {0x0F71, 0x0F7E},
- {0x0F80, 0x0F84}, {0x0F86, 0x0F87}, {0x0F90, 0x0F97},
- {0x0F99, 0x0FBC}, {0x0FC6, 0x0FC6}, {0x102D, 0x1030},
- {0x1032, 0x1032}, {0x1036, 0x1037}, {0x1039, 0x1039},
- {0x1058, 0x1059}, {0x1160, 0x11FF}, {0x1712, 0x1714},
- {0x1732, 0x1734}, {0x1752, 0x1753}, {0x1772, 0x1773},
- {0x17B4, 0x17B5}, {0x17B7, 0x17BD}, {0x17C6, 0x17C6},
- {0x17C9, 0x17D3}, {0x17DD, 0x17DD}, {0x180B, 0x180D},
- {0x18A9, 0x18A9}, {0x1920, 0x1922}, {0x1927, 0x1928},
- {0x1932, 0x1932}, {0x1939, 0x193B}, {0x200B, 0x200F},
- {0x202A, 0x202E}, {0x2060, 0x2063}, {0x206A, 0x206F},
- {0x20D0, 0x20EA}, {0x302A, 0x302F}, {0x3099, 0x309A},
- {0xFB1E, 0xFB1E}, {0xFE00, 0xFE0F}, {0xFE20, 0xFE23},
- {0xFEFF, 0xFEFF}, {0xFFF9, 0xFFFB}, {0x1D167, 0x1D169},
- {0x1D173, 0x1D182}, {0x1D185, 0x1D18B}, {0x1D1AA, 0x1D1AD},
- {0xE0001, 0xE0001}, {0xE0020, 0xE007F}, {0xE0100, 0xE01EF}
- };
-
- /* test for 8-bit control characters */
- if (ucs == 0)
- return 0;
- if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
- return -1;
-
- /* binary search in table of non-spacing characters */
- if (bisearch (ucs, combining,
- sizeof (combining) / sizeof (struct interval) - 1))
- 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 || ucs == 0x232a || (ucs >= 0x2e80 && ucs <= 0xa4cf && ucs != 0x303f) || /* CJK ... Yi */
- (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
- (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
- (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
- (ucs >= 0xff00 && ucs <= 0xff60) || /* Fullwidth Forms */
- (ucs >= 0xffe0 && ucs <= 0xffe6) ||
- (ucs >= 0x20000 && ucs <= 0x2fffd) ||
- (ucs >= 0x30000 && ucs <= 0x3fffd)));
-}
-
-#endif /* !HAVE_WC_FUNCS */
projects / apps / madmutt.git / blobdiff