1 /*
2 * utf8.c
3 * Copyright (C) 2001-2004 A.J. van Os; Released under GPL
4 *
5 *====================================================================
6 * This part of the software is based on:
7 * An implementation of wcwidth() as defined in
8 * "The Single UNIX Specification, Version 2, The Open Group, 1997"
9 * <http://www.UNIX-systems.org/online.html>
10 * Markus Kuhn -- 2001-01-12 -- public domain
11 *====================================================================
12 * The credit should go to him, but all the bugs are mine.
13 */
14
15 #include <stdlib.h>
16 #include <string.h>
17 #include "antiword.h"
18
19 struct interval {
20 USHORT first;
21 USHORT last;
22 };
23 /* Sorted list of non-overlapping intervals of non-spacing characters */
24 static const struct interval combining[] = {
25 { 0x0300, 0x034E }, { 0x0360, 0x0362 }, { 0x0483, 0x0486 },
26 { 0x0488, 0x0489 }, { 0x0591, 0x05A1 }, { 0x05A3, 0x05B9 },
27 { 0x05BB, 0x05BD }, { 0x05BF, 0x05BF }, { 0x05C1, 0x05C2 },
28 { 0x05C4, 0x05C4 }, { 0x064B, 0x0655 }, { 0x0670, 0x0670 },
29 { 0x06D6, 0x06E4 }, { 0x06E7, 0x06E8 }, { 0x06EA, 0x06ED },
30 { 0x070F, 0x070F }, { 0x0711, 0x0711 }, { 0x0730, 0x074A },
31 { 0x07A6, 0x07B0 }, { 0x0901, 0x0902 }, { 0x093C, 0x093C },
32 { 0x0941, 0x0948 }, { 0x094D, 0x094D }, { 0x0951, 0x0954 },
33 { 0x0962, 0x0963 }, { 0x0981, 0x0981 }, { 0x09BC, 0x09BC },
34 { 0x09C1, 0x09C4 }, { 0x09CD, 0x09CD }, { 0x09E2, 0x09E3 },
35 { 0x0A02, 0x0A02 }, { 0x0A3C, 0x0A3C }, { 0x0A41, 0x0A42 },
36 { 0x0A47, 0x0A48 }, { 0x0A4B, 0x0A4D }, { 0x0A70, 0x0A71 },
37 { 0x0A81, 0x0A82 }, { 0x0ABC, 0x0ABC }, { 0x0AC1, 0x0AC5 },
38 { 0x0AC7, 0x0AC8 }, { 0x0ACD, 0x0ACD }, { 0x0B01, 0x0B01 },
39 { 0x0B3C, 0x0B3C }, { 0x0B3F, 0x0B3F }, { 0x0B41, 0x0B43 },
40 { 0x0B4D, 0x0B4D }, { 0x0B56, 0x0B56 }, { 0x0B82, 0x0B82 },
41 { 0x0BC0, 0x0BC0 }, { 0x0BCD, 0x0BCD }, { 0x0C3E, 0x0C40 },
42 { 0x0C46, 0x0C48 }, { 0x0C4A, 0x0C4D }, { 0x0C55, 0x0C56 },
43 { 0x0CBF, 0x0CBF }, { 0x0CC6, 0x0CC6 }, { 0x0CCC, 0x0CCD },
44 { 0x0D41, 0x0D43 }, { 0x0D4D, 0x0D4D }, { 0x0DCA, 0x0DCA },
45 { 0x0DD2, 0x0DD4 }, { 0x0DD6, 0x0DD6 }, { 0x0E31, 0x0E31 },
46 { 0x0E34, 0x0E3A }, { 0x0E47, 0x0E4E }, { 0x0EB1, 0x0EB1 },
47 { 0x0EB4, 0x0EB9 }, { 0x0EBB, 0x0EBC }, { 0x0EC8, 0x0ECD },
48 { 0x0F18, 0x0F19 }, { 0x0F35, 0x0F35 }, { 0x0F37, 0x0F37 },
49 { 0x0F39, 0x0F39 }, { 0x0F71, 0x0F7E }, { 0x0F80, 0x0F84 },
50 { 0x0F86, 0x0F87 }, { 0x0F90, 0x0F97 }, { 0x0F99, 0x0FBC },
51 { 0x0FC6, 0x0FC6 }, { 0x102D, 0x1030 }, { 0x1032, 0x1032 },
52 { 0x1036, 0x1037 }, { 0x1039, 0x1039 }, { 0x1058, 0x1059 },
53 { 0x1160, 0x11FF }, { 0x17B7, 0x17BD }, { 0x17C6, 0x17C6 },
54 { 0x17C9, 0x17D3 }, { 0x180B, 0x180E }, { 0x18A9, 0x18A9 },
55 { 0x200B, 0x200F }, { 0x202A, 0x202E }, { 0x206A, 0x206F },
56 { 0x20D0, 0x20E3 }, { 0x302A, 0x302F }, { 0x3099, 0x309A },
57 { 0xFB1E, 0xFB1E }, { 0xFE20, 0xFE23 }, { 0xFEFF, 0xFEFF },
58 { 0xFFF9, 0xFFFB }
59 };
60
61 /* Auxiliary function for binary search in interval table */
62 static BOOL
bIsZeroWidthChar(ULONG ucs)63 bIsZeroWidthChar(ULONG ucs)
64 {
65 int low = 0;
66 int high = elementsof(combining) - 1;
67 int mid;
68
69 if (ucs < (ULONG)combining[low].first ||
70 ucs > (ULONG)combining[high].last) {
71 return FALSE;
72 }
73
74 while (high >= low) {
75 mid = (low + high) / 2;
76 if (ucs > (ULONG)combining[mid].last) {
77 low = mid + 1;
78 } else if (ucs < (ULONG)combining[mid].first) {
79 high = mid - 1;
80 } else {
81 return TRUE;
82 }
83 }
84 return FALSE;
85 } /* end of bIsZeroWidthChar */
86
87 /* The following functions define the column width of an ISO 10646
88 * character as follows:
89 *
90 * - The null character (U+0000) has a column width of 0.
91 *
92 * - Other C0/C1 control characters and DEL will lead to a return
93 * value of -1.
94 *
95 * - Non-spacing and enclosing combining characters (general
96 * category code Mn or Me in the Unicode database) have a
97 * column width of 0.
98 *
99 * - Other format characters (general category code Cf in the Unicode
100 * database) and ZERO WIDTH SPACE (U+200B) have a column width of 0.
101 *
102 * - Hangul Jamo medial vowels and final consonants (U+1160-U+11FF)
103 * have a column width of 0.
104 *
105 * - Spacing characters in the East Asian Wide (W) or East Asian
106 * FullWidth (F) category as defined in Unicode Technical
107 * Report #11 have a column width of 2.
108 *
109 * - All remaining characters (including all printable
110 * ISO 8859-1 and WGL4 characters, Unicode control characters,
111 * etc.) have a column width of 1.
112 *
113 * This implementation assumes that all characters are encoded
114 * in ISO 10646.
115 *
116 * This function is not named wcwidth() to prevent name clashes
117 */
118 static int
iWcWidth(ULONG ucs)119 iWcWidth(ULONG ucs)
120 {
121 /* Test for 8-bit control characters */
122 if (ucs == 0) {
123 return 0;
124 }
125 if (ucs < 0x20 || (ucs >= 0x7f && ucs < 0xa0)) {
126 NO_DBG_HEX(ucs);
127 return -1;
128 }
129
130 /* Binary search in table of non-spacing characters */
131 if (bIsZeroWidthChar(ucs)) {
132 return 0;
133 }
134
135 /* Ucs is not a combining or C0/C1 control character */
136
137 return 1 +
138 (ucs >= 0x1100 &&
139 (ucs <= 0x115f || /* Hangul Jamo init. consonants */
140 (ucs >= 0x2e80 && ucs <= 0xa4cf && (ucs & ~0x0011) != 0x300a &&
141 ucs != 0x303f) || /* CJK ... Yi */
142 (ucs >= 0xac00 && ucs <= 0xd7a3) || /* Hangul Syllables */
143 (ucs >= 0xf900 && ucs <= 0xfaff) || /* CJK Compatibility Ideographs */
144 (ucs >= 0xfe30 && ucs <= 0xfe6f) || /* CJK Compatibility Forms */
145 (ucs >= 0xff00 && ucs <= 0xff5f) || /* Fullwidth Forms */
146 (ucs >= 0xffe0 && ucs <= 0xffe6) ||
147 (ucs >= 0x20000 && ucs <= 0x2ffff)));
148 } /* end of iWcWidth */
149
150 /*
151 * utf8_to_ucs - convert from UTF-8 to UCS
152 *
153 * Returns the UCS character,
154 * Fills in the number of bytes in the UTF-8 character
155 */
156 static ULONG
utf8_to_ucs(const char * p,int iStrLen,int * piUtfLen)157 utf8_to_ucs(const char *p, int iStrLen, int *piUtfLen)
158 {
159 ULONG ulUcs;
160 int iIndex, iCharLen;
161
162 fail(p == NULL || piUtfLen == NULL);
163 fail(iStrLen < 1);
164
165 ulUcs = (ULONG)(UCHAR)p[0];
166
167 if (ulUcs < 0x80) {
168 *piUtfLen = 1;
169 return ulUcs;
170 }
171
172 if (ulUcs < 0xe0){
173 iCharLen = 2;
174 ulUcs &= 0x1f;
175 } else if (ulUcs < 0xf0){
176 iCharLen = 3;
177 ulUcs &= 0x0f;
178 } else if (ulUcs < 0xf8){
179 iCharLen = 4;
180 ulUcs &= 0x07;
181 } else if (ulUcs < 0xfc){
182 iCharLen = 5;
183 ulUcs &= 0x03;
184 } else {
185 iCharLen = 6;
186 ulUcs &= 0x01;
187 }
188 for (iIndex = 1; iIndex < iCharLen; iIndex++) {
189 ulUcs <<= 6;
190 if (iIndex < iStrLen) {
191 ulUcs |= (ULONG)(UCHAR)p[iIndex] & 0x3f;
192 }
193 }
194 *piUtfLen = iCharLen;
195 return ulUcs;
196 } /* end of utf8_to_ucs */
197
198 /*
199 * utf8_strwidth - compute the string width of an UTF-8 string
200 *
201 * Returns the string width in columns
202 */
203 long
utf8_strwidth(const char * pcString,size_t tNumchars)204 utf8_strwidth(const char *pcString, size_t tNumchars)
205 {
206 ULONG ulUcs;
207 long lTotal;
208 int iToGo, iWidth, iUtflen;
209
210 fail(pcString == NULL || tNumchars > (size_t)INT_MAX);
211
212 lTotal = 0;
213 iToGo = (int)tNumchars;
214
215 while (iToGo > 0 && *pcString != '\0') {
216 ulUcs = utf8_to_ucs(pcString, iToGo, &iUtflen);
217 iWidth = iWcWidth(ulUcs);
218 if (iWidth > 0) {
219 lTotal += iWidth;
220 }
221 pcString += iUtflen;
222 iToGo -= iUtflen;
223 }
224 NO_DBG_DEC(lTotal);
225 return lTotal;
226 } /* end of utf8_strwidth */
227
228 /*
229 * utf8_chrlength - get the number of bytes in an UTF-8 character
230 *
231 * Returns the number of bytes
232 */
233 int
utf8_chrlength(const char * p)234 utf8_chrlength(const char *p)
235 {
236 int iUtflen;
237
238 fail(p == NULL);
239
240 iUtflen = -1; /* Just to make sure */
241 (void)utf8_to_ucs(p, INT_MAX, &iUtflen);
242 NO_DBG_DEC(iUtflen);
243 return iUtflen;
244 } /* end of utf8_chrlength */
245
246 /*
247 * is_locale_utf8 - return TRUE if the locale is UTF-8
248 */
249 BOOL
is_locale_utf8(void)250 is_locale_utf8(void)
251 {
252 char szCodeset[20];
253
254 szCodeset[0] = '\0';
255 if (!bGetNormalizedCodeset(szCodeset, sizeof(szCodeset), NULL)) {
256 return FALSE;
257 }
258 DBG_MSG(szCodeset);
259 return STREQ(szCodeset, "utf8");
260 } /* end of is_locale_utf8 */
261