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
|
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with this library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA */
/*
More functions to be used with IO_CACHE files
*/
#define MAP_TO_USE_RAID
#include "mysys_priv.h"
#include <m_string.h>
#include <stdarg.h>
#include <m_ctype.h>
/*
** Fix that next read will be made at certain position
** For write cache, make next write happen at a certain position
*/
void my_b_seek(IO_CACHE *info,my_off_t pos)
{
if (info->type == READ_CACHE)
{
info->rc_pos=info->rc_end=info->buffer;
}
else if (info->type == WRITE_CACHE)
{
byte* try_rc_pos;
try_rc_pos = info->rc_pos + (pos - info->pos_in_file);
if (try_rc_pos >= info->buffer && try_rc_pos <= info->rc_end)
info->rc_pos = try_rc_pos;
else
flush_io_cache(info);
}
info->pos_in_file=pos;
info->seek_not_done=1;
}
/*
** Fill buffer. Note that this assumes that you have already used
** all characters in the CACHE, independent of the rc_pos value!
** return: 0 on error or EOF (info->error = -1 on error)
** number of characters
*/
uint my_b_fill(IO_CACHE *info)
{
my_off_t pos_in_file=info->pos_in_file+(uint) (info->rc_end - info->buffer);
my_off_t max_length;
uint diff_length,length;
if (info->seek_not_done)
{ /* File touched, do seek */
if (my_seek(info->file,pos_in_file,MY_SEEK_SET,MYF(0)) ==
MY_FILEPOS_ERROR)
{
info->error= 0;
return 0;
}
info->seek_not_done=0;
}
diff_length=(uint) (pos_in_file & (IO_SIZE-1));
max_length= (my_off_t) (info->end_of_file - pos_in_file);
if (max_length > (my_off_t) (info->read_length-diff_length))
max_length=(my_off_t) (info->read_length-diff_length);
if (!max_length)
{
info->error= 0;
return 0; /* EOF */
}
else if ((length=my_read(info->file,info->buffer,(uint) max_length,
info->myflags)) == (uint) -1)
{
info->error= -1;
return 0;
}
info->rc_pos=info->buffer;
info->rc_end=info->buffer+length;
info->pos_in_file=pos_in_file;
return length;
}
/*
** Read a string ended by '\n' into a buffer of 'max_length' size.
** Returns number of characters read, 0 on error.
** last byte is set to '\0'
*/
uint my_b_gets(IO_CACHE *info, char *to, uint max_length)
{
char *start = to;
uint length;
max_length--; /* Save place for end \0 */
/* Calculate number of characters in buffer */
if (!(length= my_b_bytes_in_cache(info)) &&
!(length= my_b_fill(info)))
return 0;
for (;;)
{
char *pos,*end;
if (length > max_length)
length=max_length;
for (pos=info->rc_pos,end=pos+length ; pos < end ;)
{
if ((*to++ = *pos++) == '\n')
{
info->rc_pos=pos;
*to='\0';
return (uint) (to-start);
}
}
if (!(max_length-=length))
{
/* Found enough charcters; Return found string */
info->rc_pos=pos;
*to='\0';
return (uint) (to-start);
}
if (!(length=my_b_fill(info)))
return 0;
}
}
/*
Simple printf version. Supports '%s', '%d', '%u', "%ld" and "%lu"
Used for logging in MySQL
returns number of written character, or (uint) -1 on error
*/
uint my_b_printf(IO_CACHE *info, const char* fmt, ...)
{
int result;
va_list args;
va_start(args,fmt);
result=my_b_vprintf(info, fmt, args);
va_end(args);
return result;
}
uint my_b_vprintf(IO_CACHE *info, const char* fmt, va_list args)
{
uint out_length=0;
for (; *fmt ; fmt++)
{
if (*fmt++ != '%')
{
/* Copy everything until '%' or end of string */
const char *start=fmt-1;
uint length;
for (; *fmt && *fmt != '%' ; fmt++ ) ;
length= (uint) (fmt - start);
out_length+=length;
if (my_b_write(info, start, length))
goto err;
if (!*fmt) /* End of format */
{
return out_length;
}
fmt++;
/* Found one '%' */
}
/* Skipp if max size is used (to be compatible with printf) */
while (isdigit(*fmt) || *fmt == '.' || *fmt == '-')
fmt++;
if (*fmt == 's') /* String parameter */
{
reg2 char *par = va_arg(args, char *);
uint length = (uint) strlen(par);
out_length+=length;
if (my_b_write(info, par, length))
goto err;
}
else if (*fmt == 'd' || *fmt == 'u') /* Integer parameter */
{
register int iarg;
uint length;
char buff[17];
iarg = va_arg(args, int);
if (*fmt == 'd')
length= (uint) (int10_to_str((long) iarg,buff, -10) - buff);
else
length= (uint) (int10_to_str((long) (uint) iarg,buff,10)- buff);
out_length+=length;
if (my_b_write(info, buff, length))
goto err;
}
else if ((*fmt == 'l' && fmt[1] == 'd') || fmt[1] == 'u')
/* long parameter */
{
register long iarg;
uint length;
char buff[17];
iarg = va_arg(args, long);
if (*++fmt == 'd')
length= (uint) (int10_to_str(iarg,buff, -10) - buff);
else
length= (uint) (int10_to_str(iarg,buff,10)- buff);
out_length+=length;
if (my_b_write(info, buff, length))
goto err;
}
else
{
/* %% or unknown code */
if (my_b_write(info, "%", 1))
goto err;
out_length++;
}
}
return out_length;
err:
return (uint) -1;
}
|
