/*
- * This is an implementation of wcwidth() and wcswidth() as defined in
- * "The Single UNIX Specification, Version 2, The Open Group, 1997"
- * <http://www.UNIX-systems.org/online.html>
+ * This is an implementation of wcwidth() and wcswidth() (defined in
+ * IEEE Std 1002.1-2001) for Unicode.
*
- * Markus Kuhn -- 2000-02-08 -- public domain
+ * 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
*/
-/* Adapted for Mutt by Edmund Grimley Evans.
- */
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
#ifndef HAVE_WC_FUNCS
#include <ctype.h>
-/* These functions define the column width of an ISO 10646 character
- * as follows:
+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.
*
* 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
- * FullWidth (F) category as defined in Unicode Technical
+ * Full-width (F) category as defined in Unicode Technical
* Report #11 have a column width of 2.
*
* - All remaining characters (including all printable
* in ISO 10646.
*/
-int wcwidth_ucs(wchar_t ucs)
+int wcwidth_ucs (wchar_t ucs)
{
/* sorted list of non-overlapping intervals of non-spacing characters */
- static const struct interval {
- unsigned short first;
- unsigned short last;
- } combining[] = {
- { 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 },
- { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
- { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
- { 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 },
- { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
- { 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 }, { 0x0A02, 0x0A02 },
- { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 }, { 0x0A47, 0x0A48 },
- { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 }, { 0x0A81, 0x0A82 },
- { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 }, { 0x0AC7, 0x0AC8 },
- { 0x0ACD, 0x0ACD }, { 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 }, { 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 }, { 0x17B7, 0x17BD },
- { 0x17C6, 0x17C6 }, { 0x17C9, 0x17D3 }, { 0x18A9, 0x18A9 },
- { 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
- { 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }
+ /* 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}
};
- int min = 0;
- int max = sizeof(combining) / sizeof(struct interval) - 1;
- int mid;
+ /* test for 8-bit control characters */
if (ucs == 0)
return 0;
-
- /* test for 8-bit control characters */
if (ucs < 32 || (ucs >= 0x7f && ucs < 0xa0))
return -1;
- /* first quick check for Latin-1 etc. characters */
- if (ucs < combining[0].first)
- return 1;
-
/* binary search in table of non-spacing characters */
- while (max >= min) {
- mid = (min + max) / 2;
- if (combining[mid].last < ucs)
- min = mid + 1;
- else if (combining[mid].first > ucs)
- max = mid - 1;
- else if (combining[mid].first <= ucs && combining[mid].last >= ucs)
- return 0;
- }
+ 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 */
- /* fast test for majority of non-wide scripts */
- if (ucs < 0x1100)
- return 1;
-
- return 1 +
- ((ucs >= 0x1100 && ucs <= 0x115f) || /* Hangul Jamo */
- (ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a &&
- 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 <= 0xff5f) || /* Fullwidth Forms */
- (ucs >= 0xffe0 && ucs <= 0xffe6));
+ 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 */
-
-#if 0 /* original */
-int wcswidth(const wchar_t *pwcs, size_t n)
-{
- int w, width = 0;
-
- for (;*pwcs && n-- > 0; pwcs++)
- if ((w = wcwidth(*pwcs)) < 0)
- return -1;
- else
- width += w;
-
- return width;
-}
-#endif
projects / apps / madmutt.git / blobdiff