ref: f4f19cdf1a8f0d2aa5f9fce10c896201528b5347
dir: /sys/src/cmd/aux/antiword/utf8.c/
/*
* utf8.c
* Copyright (C) 2001-2004 A.J. van Os; Released under GPL
*
*====================================================================
* This part of the software is based on:
* An implementation of wcwidth() as defined in
* "The Single UNIX Specification, Version 2, The Open Group, 1997"
* <http://www.UNIX-systems.org/online.html>
* Markus Kuhn -- 2001-01-12 -- public domain
*====================================================================
* The credit should go to him, but all the bugs are mine.
*/
#include <stdlib.h>
#include <string.h>
#include "antiword.h"
struct interval {
USHORT first;
USHORT last;
};
/* Sorted list of non-overlapping intervals of non-spacing characters */
static const struct interval 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 },
{ 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 },
{ 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 },
{ 0x1160, 0x11FF }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 },
{ 0x17C9, 0x17D3 }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 },
{ 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x206A, 0x206F },
{ 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
{ 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF },
{ 0xFFF9, 0xFFFB }
};
/* Auxiliary function for binary search in interval table */
static BOOL
bIsZeroWidthChar(ULONG ucs)
{
int low = 0;
int high = elementsof(combining) - 1;
int mid;
if (ucs < (ULONG)combining[low].first ||
ucs > (ULONG)combining[high].last) {
return FALSE;
}
while (high >= low) {
mid = (low + high) / 2;
if (ucs > (ULONG)combining[mid].last) {
low = mid + 1;
} else if (ucs < (ULONG)combining[mid].first) {
high = mid - 1;
} else {
return TRUE;
}
}
return FALSE;
} /* end of bIsZeroWidthChar */
/* The following 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.
*
* - 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
* 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 all characters are encoded
* in ISO 10646.
*
* This function is not named wcwidth() to prevent name clashes
*/
static int
iWcWidth(ULONG ucs)
{
/* Test for 8-bit control characters */
if (ucs == 0) {
return 0;
}
if (ucs < 0x20 || (ucs >= 0x7f && ucs < 0xa0)) {
NO_DBG_HEX(ucs);
return -1;
}
/* Binary search in table of non-spacing characters */
if (bIsZeroWidthChar(ucs)) {
return 0;
}
/* Ucs is not a combining or C0/C1 control character */
return 1 +
(ucs >= 0x1100 &&
(ucs <= 0x115f || /* Hangul Jamo init. consonants */
(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) ||
(ucs >= 0x20000 && ucs <= 0x2ffff)));
} /* end of iWcWidth */
/*
* utf8_to_ucs - convert from UTF-8 to UCS
*
* Returns the UCS character,
* Fills in the number of bytes in the UTF-8 character
*/
static ULONG
utf8_to_ucs(const char *p, int iStrLen, int *piUtfLen)
{
ULONG ulUcs;
int iIndex, iCharLen;
fail(p == NULL || piUtfLen == NULL);
fail(iStrLen < 1);
ulUcs = (ULONG)(UCHAR)p[0];
if (ulUcs < 0x80) {
*piUtfLen = 1;
return ulUcs;
}
if (ulUcs < 0xe0){
iCharLen = 2;
ulUcs &= 0x1f;
} else if (ulUcs < 0xf0){
iCharLen = 3;
ulUcs &= 0x0f;
} else if (ulUcs < 0xf8){
iCharLen = 4;
ulUcs &= 0x07;
} else if (ulUcs < 0xfc){
iCharLen = 5;
ulUcs &= 0x03;
} else {
iCharLen = 6;
ulUcs &= 0x01;
}
for (iIndex = 1; iIndex < iCharLen; iIndex++) {
ulUcs <<= 6;
if (iIndex < iStrLen) {
ulUcs |= (ULONG)(UCHAR)p[iIndex] & 0x3f;
}
}
*piUtfLen = iCharLen;
return ulUcs;
} /* end of utf8_to_ucs */
/*
* utf8_strwidth - compute the string width of an UTF-8 string
*
* Returns the string width in columns
*/
long
utf8_strwidth(const char *pcString, size_t tNumchars)
{
ULONG ulUcs;
long lTotal;
int iToGo, iWidth, iUtflen;
fail(pcString == NULL || tNumchars > (size_t)INT_MAX);
lTotal = 0;
iToGo = (int)tNumchars;
while (iToGo > 0 && *pcString != '\0') {
ulUcs = utf8_to_ucs(pcString, iToGo, &iUtflen);
iWidth = iWcWidth(ulUcs);
if (iWidth > 0) {
lTotal += iWidth;
}
pcString += iUtflen;
iToGo -= iUtflen;
}
NO_DBG_DEC(lTotal);
return lTotal;
} /* end of utf8_strwidth */
/*
* utf8_chrlength - get the number of bytes in an UTF-8 character
*
* Returns the number of bytes
*/
int
utf8_chrlength(const char *p)
{
int iUtflen;
fail(p == NULL);
iUtflen = -1; /* Just to make sure */
(void)utf8_to_ucs(p, INT_MAX, &iUtflen);
NO_DBG_DEC(iUtflen);
return iUtflen;
} /* end of utf8_chrlength */
/*
* is_locale_utf8 - return TRUE if the locale is UTF-8
*/
BOOL
is_locale_utf8(void)
{
char szCodeset[20];
szCodeset[0] = '\0';
if (!bGetNormalizedCodeset(szCodeset, sizeof(szCodeset), NULL)) {
return FALSE;
}
DBG_MSG(szCodeset);
return STREQ(szCodeset, "utf8");
} /* end of is_locale_utf8 */