source: trunk/lib/unicode/mbtowc.c@ 22016

Last change on this file since 22016 was 21927, checked in by dmik, 14 years ago

Fix build breaks with the newest GCC 4.4.6 from GIT.

In particular, GCC is now strict about matching the calling convention
of the prototype (argument) and the real function used.
File size: 8.4 KB
Line 
1/*
2 * MultiByteToWideChar implementation
3 *
4 * Copyright 2000 Alexandre Julliard
5 */
6
7#include <string.h>
8
9#include "winnls.h"
10#include "wine/unicode.h"
11
12/* get the decomposition of a Unicode char */
13static int get_decomposition( WCHAR src, WCHAR *dst, unsigned int dstlen )
14{
15 extern const WCHAR unicode_decompose_table[];
16 const WCHAR *ptr = unicode_decompose_table;
17 int res;
18
19 *dst = src;
20 ptr = unicode_decompose_table + ptr[src >> 8];
21 ptr = unicode_decompose_table + ptr[(src >> 4) & 0x0f] + 2 * (src & 0x0f);
22 if (!*ptr) return 1;
23 if (dstlen <= 1) return 0;
24 /* apply the decomposition recursively to the first char */
25 if ((res = get_decomposition( *ptr, dst, dstlen-1 ))) dst[res++] = ptr[1];
26 return res;
27}
28
29/* check src string for invalid chars; return non-zero if invalid char found */
30static inline int check_invalid_chars_sbcs( const struct sbcs_table *table,
31 const unsigned char *src, unsigned int srclen )
32{
33 const WCHAR * const cp2uni = table->cp2uni;
34 while (srclen)
35 {
36 if (cp2uni[*src] == table->info.def_unicode_char && *src != table->info.def_char)
37 break;
38 src++;
39 srclen--;
40 }
41 return srclen;
42}
43
44/* mbstowcs for single-byte code page */
45/* all lengths are in characters, not bytes */
46static inline int mbstowcs_sbcs( const struct sbcs_table *table,
47 const unsigned char *src, unsigned int srclen,
48 WCHAR *dst, unsigned int dstlen )
49{
50 const WCHAR * const cp2uni = table->cp2uni;
51 int ret = srclen;
52
53 if (dstlen < srclen)
54 {
55 /* buffer too small: fill it up to dstlen and return error */
56 srclen = dstlen;
57 ret = -1;
58 }
59
60 for (;;)
61 {
62 switch(srclen)
63 {
64 default:
65 case 16: dst[15] = cp2uni[src[15]];
66 case 15: dst[14] = cp2uni[src[14]];
67 case 14: dst[13] = cp2uni[src[13]];
68 case 13: dst[12] = cp2uni[src[12]];
69 case 12: dst[11] = cp2uni[src[11]];
70 case 11: dst[10] = cp2uni[src[10]];
71 case 10: dst[9] = cp2uni[src[9]];
72 case 9: dst[8] = cp2uni[src[8]];
73 case 8: dst[7] = cp2uni[src[7]];
74 case 7: dst[6] = cp2uni[src[6]];
75 case 6: dst[5] = cp2uni[src[5]];
76 case 5: dst[4] = cp2uni[src[4]];
77 case 4: dst[3] = cp2uni[src[3]];
78 case 3: dst[2] = cp2uni[src[2]];
79 case 2: dst[1] = cp2uni[src[1]];
80 case 1: dst[0] = cp2uni[src[0]];
81 case 0: break;
82 }
83 if (srclen < 16) return ret;
84 dst += 16;
85 src += 16;
86 srclen -= 16;
87 }
88}
89
90/* mbstowcs for single-byte code page with char decomposition */
91static int mbstowcs_sbcs_decompose( const struct sbcs_table *table,
92 const unsigned char *src, unsigned int srclen,
93 WCHAR *dst, unsigned int dstlen )
94{
95 const WCHAR * const cp2uni = table->cp2uni;
96 unsigned int len;
97
98 if (!dstlen) /* compute length */
99 {
100 WCHAR dummy[4]; /* no decomposition is larger than 4 chars */
101 for (len = 0; srclen; srclen--, src++)
102 len += get_decomposition( cp2uni[*src], dummy, 4 );
103 return len;
104 }
105
106 for (len = dstlen; srclen && len; srclen--, src++)
107 {
108 int res = get_decomposition( cp2uni[*src], dst, len );
109 if (!res) break;
110 len -= res;
111 dst += res;
112 }
113 if (srclen) return -1; /* overflow */
114 return dstlen - len;
115}
116
117/* query necessary dst length for src string */
118static inline int get_length_dbcs( const struct dbcs_table *table,
119 const unsigned char *src, unsigned int srclen )
120{
121 const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
122 int len;
123
124 for (len = 0; srclen; srclen--, src++, len++)
125 {
126 if (cp2uni_lb[*src])
127 {
128 if (!--srclen) break; /* partial char, ignore it */
129 src++;
130 }
131 }
132 return len;
133}
134
135/* check src string for invalid chars; return non-zero if invalid char found */
136static inline int check_invalid_chars_dbcs( const struct dbcs_table *table,
137 const unsigned char *src, unsigned int srclen )
138{
139 const WCHAR * const cp2uni = table->cp2uni;
140 const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
141
142 while (srclen)
143 {
144 unsigned char off = cp2uni_lb[*src];
145 if (off) /* multi-byte char */
146 {
147 if (srclen == 1) break; /* partial char, error */
148 if (cp2uni[(off << 8) + src[1]] == table->info.def_unicode_char &&
149 ((src[0] << 8) | src[1]) != table->info.def_char) break;
150 src++;
151 srclen--;
152 }
153 else if (cp2uni[*src] == table->info.def_unicode_char &&
154 *src != table->info.def_char) break;
155 src++;
156 srclen--;
157 }
158 return srclen;
159}
160
161/* mbstowcs for double-byte code page */
162/* all lengths are in characters, not bytes */
163static inline int mbstowcs_dbcs( const struct dbcs_table *table,
164 const unsigned char *src, unsigned int srclen,
165 WCHAR *dst, unsigned int dstlen )
166{
167 const WCHAR * const cp2uni = table->cp2uni;
168 const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
169 unsigned int len;
170
171 if (!dstlen) return get_length_dbcs( table, src, srclen );
172
173 for (len = dstlen; srclen && len; len--, srclen--, src++, dst++)
174 {
175 unsigned char off = cp2uni_lb[*src];
176 if (off)
177 {
178 if (!--srclen) break; /* partial char, ignore it */
179 src++;
180 *dst = cp2uni[(off << 8) + *src];
181 }
182 else *dst = cp2uni[*src];
183 }
184 if (srclen) return -1; /* overflow */
185 return dstlen - len;
186}
187
188
189/* mbstowcs for double-byte code page with character decomposition */
190static int mbstowcs_dbcs_decompose( const struct dbcs_table *table,
191 const unsigned char *src, unsigned int srclen,
192 WCHAR *dst, unsigned int dstlen )
193{
194 const WCHAR * const cp2uni = table->cp2uni;
195 const unsigned char * const cp2uni_lb = table->cp2uni_leadbytes;
196 unsigned int len;
197 WCHAR ch;
198 int res;
199
200 if (!dstlen) /* compute length */
201 {
202 WCHAR dummy[4]; /* no decomposition is larger than 4 chars */
203 for (len = 0; srclen; srclen--, src++)
204 {
205 unsigned char off = cp2uni_lb[*src];
206 if (off)
207 {
208 if (!--srclen) break; /* partial char, ignore it */
209 src++;
210 ch = cp2uni[(off << 8) + *src];
211 }
212 else ch = cp2uni[*src];
213 len += get_decomposition( ch, dummy, 4 );
214 }
215 return len;
216 }
217
218 for (len = dstlen; srclen && len; srclen--, src++)
219 {
220 unsigned char off = cp2uni_lb[*src];
221 if (off)
222 {
223 if (!--srclen) break; /* partial char, ignore it */
224 src++;
225 ch = cp2uni[(off << 8) + *src];
226 }
227 else ch = cp2uni[*src];
228 if (!(res = get_decomposition( ch, dst, len ))) break;
229 dst += res;
230 len -= res;
231 }
232 if (srclen) return -1; /* overflow */
233 return dstlen - len;
234}
235
236
237/* return -1 on dst buffer overflow, -2 on invalid input char */
238_K32CONV int cp_mbstowcs( const union cptable *table, int flags,
239 const char *src, int srclen,
240 WCHAR *dst, int dstlen )
241{
242 if (NULL == src) return -2;
243
244 if (table->info.char_size == 1)
245 {
246 if (flags & MB_ERR_INVALID_CHARS)
247 {
248 if (check_invalid_chars_sbcs( &table->sbcs, (const unsigned char *)src, srclen )) return -2;
249 }
250 if (!(flags & MB_COMPOSITE))
251 {
252 if (!dstlen) return srclen;
253 return mbstowcs_sbcs( &table->sbcs, (const unsigned char *)src, srclen, dst, dstlen );
254 }
255 return mbstowcs_sbcs_decompose( &table->sbcs, (const unsigned char *)src, srclen, dst, dstlen );
256 }
257 else /* mbcs */
258 {
259 if (flags & MB_ERR_INVALID_CHARS)
260 {
261 if (check_invalid_chars_dbcs( &table->dbcs, (const unsigned char *)src, srclen )) return -2;
262 }
263 if (!(flags & MB_COMPOSITE))
264 return mbstowcs_dbcs( &table->dbcs, (const unsigned char *)src, srclen, dst, dstlen );
265 else
266 return mbstowcs_dbcs_decompose( &table->dbcs, (const unsigned char *)src, srclen, dst, dstlen );
267 }
268}
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