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[wine/wine64.git] / libs / wine / mbtowc.c
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1 /*
2 * MultiByteToWideChar implementation
4 * Copyright 2000 Alexandre Julliard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
21 #include <string.h>
23 #include "wine/unicode.h"
25 /* get the decomposition of a Unicode char */
26 static int get_decomposition( WCHAR src, WCHAR *dst, unsigned int dstlen )
28 extern const WCHAR unicode_decompose_table[];
29 const WCHAR *ptr = unicode_decompose_table;
30 int res;
32 *dst = src;
33 ptr = unicode_decompose_table + ptr[src >> 8];
34 ptr = unicode_decompose_table + ptr[(src >> 4) & 0x0f] + 2 * (src & 0x0f);
35 if (!*ptr) return 1;
36 if (dstlen <= 1) return 0;
37 /* apply the decomposition recursively to the first char */
38 if ((res = get_decomposition( *ptr, dst, dstlen-1 ))) dst[res++] = ptr[1];
39 return res;
42 /* check src string for invalid chars; return non-zero if invalid char found */
43 static inline int check_invalid_chars_sbcs( const struct sbcs_table *table, int flags,
44 const unsigned char *src, unsigned int srclen )
46 const WCHAR * const cp2uni = (flags & MB_USEGLYPHCHARS) ? table->cp2uni_glyphs : table->cp2uni;
47 while (srclen)
49 if (cp2uni[*src] == table->info.def_unicode_char && *src != table->info.def_char)
50 break;
51 src++;
52 srclen--;
54 return srclen;
57 /* mbstowcs for single-byte code page */
58 /* all lengths are in characters, not bytes */
59 static inline int mbstowcs_sbcs( const struct sbcs_table *table, int flags,
60 const unsigned char *src, unsigned int srclen,
61 WCHAR *dst, unsigned int dstlen )
63 const WCHAR * const cp2uni = (flags & MB_USEGLYPHCHARS) ? table->cp2uni_glyphs : table->cp2uni;
64 int ret = srclen;
66 if (dstlen < srclen)
68 /* buffer too small: fill it up to dstlen and return error */
69 srclen = dstlen;
70 ret = -1;
73 for (;;)
75 switch(srclen)
77 default:
78 case 16: dst[15] = cp2uni[src[15]];
79 case 15: dst[14] = cp2uni[src[14]];
80 case 14: dst[13] = cp2uni[src[13]];
81 case 13: dst[12] = cp2uni[src[12]];
82 case 12: dst[11] = cp2uni[src[11]];
83 case 11: dst[10] = cp2uni[src[10]];
84 case 10: dst[9] = cp2uni[src[9]];
85 case 9: dst[8] = cp2uni[src[8]];
86 case 8: dst[7] = cp2uni[src[7]];
87 case 7: dst[6] = cp2uni[src[6]];
88 case 6: dst[5] = cp2uni[src[5]];
89 case 5: dst[4] = cp2uni[src[4]];
90 case 4: dst[3] = cp2uni[src[3]];
91 case 3: dst[2] = cp2uni[src[2]];
92 case 2: dst[1] = cp2uni[src[1]];
93 case 1: dst[0] = cp2uni[src[0]];
94 case 0: break;
96 if (srclen < 16) return ret;
97 dst += 16;
98 src += 16;
99 srclen -= 16;
103 /* mbstowcs for single-byte code page with char decomposition */
104 static int mbstowcs_sbcs_decompose( const struct sbcs_table *table, int flags,
105 const unsigned char *src, unsigned int srclen,
106 WCHAR *dst, unsigned int dstlen )
108 const WCHAR * const cp2uni = (flags & MB_USEGLYPHCHARS) ? table->cp2uni_glyphs : table->cp2uni;
109 unsigned int len;
111 if (!dstlen) /* compute length */
113 WCHAR dummy[4]; /* no decomposition is larger than 4 chars */
114 for (len = 0; srclen; srclen--, src++)
115 len += get_decomposition( cp2uni[*src], dummy, 4 );
116 return len;
119 for (len = dstlen; srclen && len; srclen--, src++)
121 int res = get_decomposition( cp2uni[*src], dst, len );
122 if (!res) break;
123 len -= res;
124 dst += res;
126 if (srclen) return -1; /* overflow */
127 return dstlen - len;
130 /* query necessary dst length for src string */
131 static inline int get_length_dbcs( const struct dbcs_table *table,
132 const unsigned char *src, unsigned int srclen )
134 const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
135 int len;
137 for (len = 0; srclen; srclen--, src++, len++)
139 if (cp2uni_lb[*src])
141 if (!--srclen) break; /* partial char, ignore it */
142 src++;
145 return len;
148 /* check src string for invalid chars; return non-zero if invalid char found */
149 static inline int check_invalid_chars_dbcs( const struct dbcs_table *table,
150 const unsigned char *src, unsigned int srclen )
152 const WCHAR * const cp2uni = table->cp2uni;
153 const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
155 while (srclen)
157 unsigned char off = cp2uni_lb[*src];
158 if (off) /* multi-byte char */
160 if (srclen == 1) break; /* partial char, error */
161 if (cp2uni[(off << 8) + src[1]] == table->info.def_unicode_char &&
162 ((src[0] << 8) | src[1]) != table->info.def_char) break;
163 src++;
164 srclen--;
166 else if (cp2uni[*src] == table->info.def_unicode_char &&
167 *src != table->info.def_char) break;
168 src++;
169 srclen--;
171 return srclen;
174 /* mbstowcs for double-byte code page */
175 /* all lengths are in characters, not bytes */
176 static inline int mbstowcs_dbcs( const struct dbcs_table *table,
177 const unsigned char *src, unsigned int srclen,
178 WCHAR *dst, unsigned int dstlen )
180 const WCHAR * const cp2uni = table->cp2uni;
181 const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
182 unsigned int len;
184 if (!dstlen) return get_length_dbcs( table, src, srclen );
186 for (len = dstlen; srclen && len; len--, srclen--, src++, dst++)
188 unsigned char off = cp2uni_lb[*src];
189 if (off)
191 if (!--srclen) break; /* partial char, ignore it */
192 src++;
193 *dst = cp2uni[(off << 8) + *src];
195 else *dst = cp2uni[*src];
197 if (srclen) return -1; /* overflow */
198 return dstlen - len;
202 /* mbstowcs for double-byte code page with character decomposition */
203 static int mbstowcs_dbcs_decompose( const struct dbcs_table *table,
204 const unsigned char *src, unsigned int srclen,
205 WCHAR *dst, unsigned int dstlen )
207 const WCHAR * const cp2uni = table->cp2uni;
208 const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
209 unsigned int len;
210 WCHAR ch;
211 int res;
213 if (!dstlen) /* compute length */
215 WCHAR dummy[4]; /* no decomposition is larger than 4 chars */
216 for (len = 0; srclen; srclen--, src++)
218 unsigned char off = cp2uni_lb[*src];
219 if (off)
221 if (!--srclen) break; /* partial char, ignore it */
222 src++;
223 ch = cp2uni[(off << 8) + *src];
225 else ch = cp2uni[*src];
226 len += get_decomposition( ch, dummy, 4 );
228 return len;
231 for (len = dstlen; srclen && len; srclen--, src++)
233 unsigned char off = cp2uni_lb[*src];
234 if (off)
236 if (!--srclen) break; /* partial char, ignore it */
237 src++;
238 ch = cp2uni[(off << 8) + *src];
240 else ch = cp2uni[*src];
241 if (!(res = get_decomposition( ch, dst, len ))) break;
242 dst += res;
243 len -= res;
245 if (srclen) return -1; /* overflow */
246 return dstlen - len;
250 /* return -1 on dst buffer overflow, -2 on invalid input char */
251 int wine_cp_mbstowcs( const union cptable *table, int flags,
252 const char *s, int srclen,
253 WCHAR *dst, int dstlen )
255 const unsigned char *src = (const unsigned char*) s;
257 if (table->info.char_size == 1)
259 if (flags & MB_ERR_INVALID_CHARS)
261 if (check_invalid_chars_sbcs( &table->sbcs, flags, src, srclen )) return -2;
263 if (!(flags & MB_COMPOSITE))
265 if (!dstlen) return srclen;
266 return mbstowcs_sbcs( &table->sbcs, flags, src, srclen, dst, dstlen );
268 return mbstowcs_sbcs_decompose( &table->sbcs, flags, src, srclen, dst, dstlen );
270 else /* mbcs */
272 if (flags & MB_ERR_INVALID_CHARS)
274 if (check_invalid_chars_dbcs( &table->dbcs, src, srclen )) return -2;
276 if (!(flags & MB_COMPOSITE))
277 return mbstowcs_dbcs( &table->dbcs, src, srclen, dst, dstlen );
278 else
279 return mbstowcs_dbcs_decompose( &table->dbcs, src, srclen, dst, dstlen );
283 /* CP_SYMBOL implementation */
284 /* return -1 on dst buffer overflow */
285 int wine_cpsymbol_mbstowcs( const char *src, int srclen, WCHAR *dst, int dstlen)
287 int len, i;
288 if( dstlen == 0) return srclen;
289 len = dstlen > srclen ? srclen : dstlen;
290 for( i = 0; i < len; i++)
292 unsigned char c = src [ i ];
293 if( c < 0x20 )
294 dst[i] = c;
295 else
296 dst[i] = c + 0xf000;
298 if( srclen > len) return -1;
299 return len;