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/* SPDX-License-Identifier: LGPL-2.1+ */
/* gunicode.c - Unicode manipulation functions
*
* Copyright (C) 1999, 2000 Tom Tromey
* Copyright © 2000, 2005 Red Hat, Inc.
*/
#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)
{
for (;;)
{
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
};
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