/* gunicode.c - Unicode manipulation functions * * Copyright (C) 1999, 2000 Tom Tromey * Copyright 2000, 2005 Red Hat, Inc. */ #include <stdlib.h> #include "gunicode.h" #define unichar uint32_t /** * g_utf8_prev_char: * @p: a pointer to a position within a UTF-8 encoded string * * Finds the previous UTF-8 character in the string before @p. * * @p does not have to be at the beginning of a UTF-8 character. No check * is made to see if the character found is actually valid other than * it starts with an appropriate byte. If @p might be the first * character of the string, you must use g_utf8_find_prev_char() instead. * * Return value: a pointer to the found character. **/ char * utf8_prev_char (const char *p) { while (1) { p--; if ((*p & 0xc0) != 0x80) return (char *)p; } } struct Interval { unichar start, end; }; static int interval_compare (const void *key, const void *elt) { unichar c = (unichar) (long) (key); struct Interval *interval = (struct Interval *)elt; if (c < interval->start) return -1; if (c > interval->end) return +1; return 0; } /* * NOTE: * * The tables for g_unichar_iswide() and g_unichar_iswide_cjk() are * generated from the Unicode Character Database's file * extracted/DerivedEastAsianWidth.txt using the gen-iswide-table.py * in this way: * * ./gen-iswide-table.py < path/to/ucd/extracted/DerivedEastAsianWidth.txt | fmt * * Last update for Unicode 6.0. */ /** * g_unichar_iswide: * @c: a Unicode character * * Determines if a character is typically rendered in a double-width * cell. * * Return value: %TRUE if the character is wide **/ bool unichar_iswide (unichar c) { /* See NOTE earlier for how to update this table. */ static const struct Interval wide[] = { {0x1100, 0x115F}, {0x2329, 0x232A}, {0x2E80, 0x2E99}, {0x2E9B, 0x2EF3}, {0x2F00, 0x2FD5}, {0x2FF0, 0x2FFB}, {0x3000, 0x303E}, {0x3041, 0x3096}, {0x3099, 0x30FF}, {0x3105, 0x312D}, {0x3131, 0x318E}, {0x3190, 0x31BA}, {0x31C0, 0x31E3}, {0x31F0, 0x321E}, {0x3220, 0x3247}, {0x3250, 0x32FE}, {0x3300, 0x4DBF}, {0x4E00, 0xA48C}, {0xA490, 0xA4C6}, {0xA960, 0xA97C}, {0xAC00, 0xD7A3}, {0xF900, 0xFAFF}, {0xFE10, 0xFE19}, {0xFE30, 0xFE52}, {0xFE54, 0xFE66}, {0xFE68, 0xFE6B}, {0xFF01, 0xFF60}, {0xFFE0, 0xFFE6}, {0x1B000, 0x1B001}, {0x1F200, 0x1F202}, {0x1F210, 0x1F23A}, {0x1F240, 0x1F248}, {0x1F250, 0x1F251}, {0x1F300, 0x1F567}, /* Miscellaneous Symbols and Pictographs */ {0x20000, 0x2FFFD}, {0x30000, 0x3FFFD}, }; if (bsearch ((void *)(uintptr_t)c, wide, (sizeof (wide) / sizeof ((wide)[0])), sizeof wide[0], interval_compare)) return true; return false; } const char utf8_skip_data[256] = { 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,4,4,4,4,4,4,4,4,5,5,5,5,6,6,1,1 };