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Diffstat (limited to 'app/tools/halibut/wcwidth.c')
| -rw-r--r-- | app/tools/halibut/wcwidth.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/app/tools/halibut/wcwidth.c b/app/tools/halibut/wcwidth.c new file mode 100644 index 0000000..269359f --- /dev/null +++ b/app/tools/halibut/wcwidth.c @@ -0,0 +1,184 @@ +/* + * A wrapper around wcswidth() to have it ignore characters which + * are not represented in a particular output charset. + */ + +#include <assert.h> +#include <stdlib.h> +#include "halibut.h" + +#ifndef HAS_WCSWIDTH + +/* + * Markus Kuhn's public domain wcwidth() implementation, cribbed + * from + * + * http://www.cl.cam.ac.uk/~mgk25/ucs/wcwidth.c + */ + +#define wcswidth mk_wcswidth + +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; +} + +int mk_wcwidth(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))); +} + + +int mk_wcswidth(const wchar_t *pwcs, size_t n) +{ + int w, width = 0; + + for (;*pwcs && n-- > 0; pwcs++) + if ((w = mk_wcwidth(*pwcs)) < 0) + return -1; + else + width += w; + + return width; +} + +#endif + +int ustrwid(wchar_t const *s, int charset) +{ + char buf[256]; + int wid, len = ustrlen(s); + charset_state state = CHARSET_INIT_STATE; + + wid = 0; + + while (len > 0) { + int err, ret; + wchar_t const *s_orig; + + err = 0; + s_orig = s; + ret = charset_from_unicode(&s, &len, buf, lenof(buf), + charset, &state, &err); + wid += wcswidth(s_orig, s - s_orig); + if (err) { + assert(len > 0 && *s); + s++; + len--; + } + } + + return wid; +} + +int strwid(char const *s, int charset) +{ + wchar_t buf[256]; + int wid, len = strlen(s); + charset_state state = CHARSET_INIT_STATE; + + wid = 0; + + while (len > 0) { + int ret; + + ret = charset_to_unicode(&s, &len, buf, lenof(buf), + charset, &state, NULL, 0); + + if (ret > 0) + wid += wcswidth(buf, ret); + } + + return wid; +} |