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
|
/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/*
Code for handling strings with can grow dynamicly.
Copyright Monty Program KB.
By monty.
*/
#include "mysys_priv.h"
#include <m_string.h>
my_bool init_dynamic_string(DYNAMIC_STRING *str, const char *init_str,
size_t init_alloc, size_t alloc_increment)
{
size_t length;
DBUG_ENTER("init_dynamic_string");
if (!alloc_increment)
alloc_increment=128;
length=1;
if (init_str && (length= strlen(init_str)+1) < init_alloc)
init_alloc=((length+alloc_increment-1)/alloc_increment)*alloc_increment;
if (!init_alloc)
init_alloc=alloc_increment;
if (!(str->str=(char*) my_malloc(init_alloc,MYF(MY_WME))))
DBUG_RETURN(TRUE);
str->length=length-1;
if (init_str)
memcpy(str->str,init_str,length);
str->max_length=init_alloc;
str->alloc_increment=alloc_increment;
DBUG_RETURN(FALSE);
}
my_bool dynstr_set(DYNAMIC_STRING *str, const char *init_str)
{
uint length=0;
DBUG_ENTER("dynstr_set");
if (init_str && (length= (uint) strlen(init_str)+1) > str->max_length)
{
str->max_length=((length+str->alloc_increment-1)/str->alloc_increment)*
str->alloc_increment;
if (!str->max_length)
str->max_length=str->alloc_increment;
if (!(str->str=(char*) my_realloc(str->str,str->max_length,MYF(MY_WME))))
DBUG_RETURN(TRUE);
}
if (init_str)
{
str->length=length-1;
memcpy(str->str,init_str,length);
}
else
str->length=0;
DBUG_RETURN(FALSE);
}
my_bool dynstr_realloc(DYNAMIC_STRING *str, size_t additional_size)
{
DBUG_ENTER("dynstr_realloc");
if (!additional_size) DBUG_RETURN(FALSE);
if (str->length + additional_size > str->max_length)
{
str->max_length=((str->length + additional_size+str->alloc_increment-1)/
str->alloc_increment)*str->alloc_increment;
if (!(str->str=(char*) my_realloc(str->str,str->max_length,MYF(MY_WME))))
DBUG_RETURN(TRUE);
}
DBUG_RETURN(FALSE);
}
my_bool dynstr_append(DYNAMIC_STRING *str, const char *append)
{
return dynstr_append_mem(str,append,(uint) strlen(append));
}
my_bool dynstr_append_mem(DYNAMIC_STRING *str, const char *append,
size_t length)
{
char *new_ptr;
DBUG_ENTER("dynstr_append_mem");
if (str->length+length >= str->max_length)
{
size_t new_length=(str->length+length+str->alloc_increment)/
str->alloc_increment;
new_length*=str->alloc_increment;
if (!(new_ptr=(char*) my_realloc(str->str,new_length,MYF(MY_WME))))
DBUG_RETURN(TRUE);
str->str=new_ptr;
str->max_length=new_length;
}
memcpy(str->str + str->length,append,length);
str->length+=length;
str->str[str->length]=0; /* Safety for C programs */
DBUG_RETURN(FALSE);
}
my_bool dynstr_trunc(DYNAMIC_STRING *str, size_t n)
{
str->length-=n;
str->str[str->length]= '\0';
return FALSE;
}
/*
Concatenates any number of strings, escapes any OS quote in the result then
surround the whole affair in another set of quotes which is finally appended
to specified DYNAMIC_STRING. This function is especially useful when
building strings to be executed with the system() function.
@param str Dynamic String which will have addtional strings appended.
@param append String to be appended.
@param ... Optional. Additional string(s) to be appended.
@note The final argument in the list must be NullS even if no additional
options are passed.
@return True = Success.
*/
my_bool dynstr_append_os_quoted(DYNAMIC_STRING *str, const char *append, ...)
{
#ifdef __WIN__
const char *quote_str= "\"";
const uint quote_len= 1;
#else
const char *quote_str= "\'";
const uint quote_len= 1;
#endif /* __WIN__ */
my_bool ret= TRUE;
va_list dirty_text;
ret&= dynstr_append_mem(str, quote_str, quote_len); /* Leading quote */
va_start(dirty_text, append);
while (append != NullS)
{
const char *cur_pos= append;
const char *next_pos= cur_pos;
/* Search for quote in each string and replace with escaped quote */
while(*(next_pos= strcend(cur_pos, quote_str[0])) != '\0')
{
ret&= dynstr_append_mem(str, cur_pos, (uint) (next_pos - cur_pos));
ret&= dynstr_append_mem(str ,"\\", 1);
ret&= dynstr_append_mem(str, quote_str, quote_len);
cur_pos= next_pos + 1;
}
ret&= dynstr_append_mem(str, cur_pos, (uint) (next_pos - cur_pos));
append= va_arg(dirty_text, char *);
}
va_end(dirty_text);
ret&= dynstr_append_mem(str, quote_str, quote_len); /* Trailing quote */
return ret;
}
my_bool dynstr_append_quoted(DYNAMIC_STRING *str,
const char *append, size_t len,
char quote)
{
uint additional= (str->alloc_increment ? str->alloc_increment : 10);
uint lim= additional;
uint i;
if (dynstr_realloc(str, len + additional + 2))
return TRUE;
str->str[str->length++]= quote;
for (i= 0; i < len; i++)
{
register char c= append[i];
if (c == quote || c == '\\')
{
if (!lim)
{
if (dynstr_realloc(str, additional))
return TRUE;
lim= additional;
}
lim--;
str->str[str->length++]= '\\';
}
str->str[str->length++]= c;
}
str->str[str->length++]= quote;
return FALSE;
}
void dynstr_free(DYNAMIC_STRING *str)
{
my_free(str->str);
str->str= NULL;
}
/* Give over the control of the dynamic string to caller */
void dynstr_reassociate(DYNAMIC_STRING *str, char **ptr, size_t *length,
size_t *alloc_length)
{
*ptr= str->str;
*length= str->length;
*alloc_length= str->max_length;
str->str=0;
}
|
