1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
|
/* Copyright (C) 2003 MySQL AB
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* Some useful string utility functions used by the MySQL server */
#include <drizzled/server_includes.h>
/*
Return bitmap for strings used in a set
SYNOPSIS
find_set()
lib Strings in set
str Strings of set-strings separated by ','
err_pos If error, set to point to start of wrong set string
err_len If error, set to the length of wrong set string
set_warning Set to 1 if some string in set couldn't be used
NOTE
We delete all end space from str before comparison
RETURN
bitmap of all sets found in x.
set_warning is set to 1 if there was any sets that couldn't be set
*/
static const char field_separator=',';
uint64_t find_set(TYPELIB *lib, const char *str, uint32_t length,
const CHARSET_INFO * const cs,
char **err_pos, uint32_t *err_len, bool *set_warning)
{
const CHARSET_INFO * const strip= cs ? cs : &my_charset_utf8_general_ci;
const char *end= str + strip->cset->lengthsp(strip, str, length);
uint64_t found= 0;
*err_pos= 0; // No error yet
if (str != end)
{
const char *start= str;
for (;;)
{
const char *pos= start;
uint32_t var_len;
int mblen= 1;
if (cs && cs->mbminlen > 1)
{
for ( ; pos < end; pos+= mblen)
{
my_wc_t wc;
if ((mblen= cs->cset->mb_wc(cs, &wc, (const unsigned char *) pos,
(const unsigned char *) end)) < 1)
mblen= 1; // Not to hang on a wrong multibyte sequence
if (wc == (my_wc_t) field_separator)
break;
}
}
else
for (; pos != end && *pos != field_separator; pos++) ;
var_len= (uint32_t) (pos - start);
uint32_t find= cs ? find_type2(lib, start, var_len, cs) :
find_type(lib, start, var_len, (bool) 0);
if (!find)
{
*err_pos= (char*) start;
*err_len= var_len;
*set_warning= 1;
}
else
found|= ((int64_t) 1 << (find - 1));
if (pos >= end)
break;
start= pos + mblen;
}
}
return found;
}
/*
Function to find a string in a TYPELIB
(Same format as mysys/typelib.c)
SYNOPSIS
find_type()
lib TYPELIB (struct of pointer to values + count)
find String to find
length Length of string to find
part_match Allow part matching of value
RETURN
0 error
> 0 position in TYPELIB->type_names +1
*/
uint32_t find_type(const TYPELIB *lib, const char *find, uint32_t length,
bool part_match)
{
uint32_t found_count=0, found_pos=0;
const char *end= find+length;
const char *i;
const char *j;
for (uint32_t pos=0 ; (j=lib->type_names[pos++]) ; )
{
for (i=find ; i != end &&
my_toupper(system_charset_info,*i) ==
my_toupper(system_charset_info,*j) ; i++, j++) ;
if (i == end)
{
if (! *j)
return(pos);
found_count++;
found_pos= pos;
}
}
return(found_count == 1 && part_match ? found_pos : 0);
}
/*
Find a string in a list of strings according to collation
SYNOPSIS
find_type2()
lib TYPELIB (struct of pointer to values + count)
x String to find
length String length
cs Character set + collation to use for comparison
NOTES
RETURN
0 No matching value
>0 Offset+1 in typelib for matched string
*/
uint32_t find_type2(const TYPELIB *typelib, const char *x, uint32_t length,
const CHARSET_INFO * const cs)
{
int pos;
const char *j;
if (!typelib->count)
{
return(0);
}
for (pos=0 ; (j=typelib->type_names[pos]) ; pos++)
{
if (!my_strnncoll(cs, (const unsigned char*) x, length,
(const unsigned char*) j, typelib->type_lengths[pos]))
return(pos+1);
}
return(0);
} /* find_type */
/*
Un-hex all elements in a typelib
SYNOPSIS
unhex_type2()
interval TYPELIB (struct of pointer to values + lengths + count)
NOTES
RETURN
N/A
*/
void unhex_type2(TYPELIB *interval)
{
for (uint32_t pos= 0; pos < interval->count; pos++)
{
char *from, *to;
for (from= to= (char*) interval->type_names[pos]; *from; )
{
/*
Note, hexchar_to_int(*from++) doesn't work
one some compilers, e.g. IRIX. Looks like a compiler
bug in inline functions in combination with arguments
that have a side effect. So, let's use from[0] and from[1]
and increment 'from' by two later.
*/
*to++= (char) (hexchar_to_int(from[0]) << 4) +
hexchar_to_int(from[1]);
from+= 2;
}
interval->type_lengths[pos] /= 2;
}
}
/*
Check if the first word in a string is one of the ones in TYPELIB
SYNOPSIS
check_word()
lib TYPELIB
val String to check
end End of input
end_of_word Store value of last used byte here if we found word
RETURN
0 No matching value
> 1 lib->type_names[#-1] matched
end_of_word will point to separator character/end in 'val'
*/
uint32_t check_word(TYPELIB *lib, const char *val, const char *end,
const char **end_of_word)
{
int res;
const char *ptr;
/* Fiend end of word */
for (ptr= val ; ptr < end && my_isalpha(&my_charset_utf8_general_ci, *ptr) ; ptr++)
;
if ((res=find_type(lib, val, (uint32_t) (ptr - val), 1)) > 0)
*end_of_word= ptr;
return res;
}
/*
Converts a string between character sets
SYNOPSIS
strconvert()
from_cs source character set
from source, a null terminated string
to destination buffer
to_length destination buffer length
NOTES
'to' is always terminated with a '\0' character.
If there is no enough space to convert whole string,
only prefix is converted, and terminated with '\0'.
RETURN VALUES
result string length
*/
uint32_t strconvert(const CHARSET_INFO * const from_cs, const char *from,
const CHARSET_INFO * const to_cs, char *to, uint32_t to_length, uint32_t *errors)
{
int cnvres;
my_wc_t wc;
char *to_start= to;
unsigned char *to_end= (unsigned char*) to + to_length - 1;
my_charset_conv_mb_wc mb_wc= from_cs->cset->mb_wc;
my_charset_conv_wc_mb wc_mb= to_cs->cset->wc_mb;
uint32_t error_count= 0;
while (1)
{
/*
Using 'from + 10' is safe:
- it is enough to scan a single character in any character set.
- if remaining string is shorter than 10, then mb_wc will return
with error because of unexpected '\0' character.
*/
if ((cnvres= (*mb_wc)(from_cs, &wc,
(unsigned char*) from, (unsigned char*) from + 10)) > 0)
{
if (!wc)
break;
from+= cnvres;
}
else if (cnvres == MY_CS_ILSEQ)
{
error_count++;
from++;
wc= '?';
}
else
break; // Impossible char.
outp:
if ((cnvres= (*wc_mb)(to_cs, wc, (unsigned char*) to, to_end)) > 0)
to+= cnvres;
else if (cnvres == MY_CS_ILUNI && wc != '?')
{
error_count++;
wc= '?';
goto outp;
}
else
break;
}
*to= '\0';
*errors= error_count;
return (uint32_t) (to - to_start);
}
/*
Searches for a LEX_STRING in an LEX_STRING array.
SYNOPSIS
find_string_in_array()
heap The array
needle The string to search for
NOTE
The last LEX_STRING in the array should have str member set to NULL
RETURN VALUES
-1 Not found
>=0 Ordinal position
*/
int find_string_in_array(LEX_STRING * const haystack, LEX_STRING * const needle,
const CHARSET_INFO * const cs)
{
const LEX_STRING *pos;
for (pos= haystack; pos->str; pos++)
if (!cs->coll->strnncollsp(cs, (unsigned char *) pos->str, pos->length,
(unsigned char *) needle->str, needle->length, 0))
{
return (pos - haystack);
}
return -1;
}
|