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
|
/* Copyright (C) 2000 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; either version 2 of the License, or
(at your option) any later version.
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 */
#include "mysys_priv.h"
#include "mysys_err.h"
#include <m_string.h>
#include <stdarg.h>
#include <m_ctype.h>
/* Define some external variables for error handling */
/*
WARNING!
my_error family functions have to be used according following rules:
- if message have not parameters use my_message(ER_CODE, ER(ER_CODE), MYF(N))
- if message registered use my_error(ER_CODE, MYF(N), ...).
- With some special text of errror message use:
my_printf_error(ER_CODE, format, MYF(N), ...)
*/
char NEAR errbuff[NRERRBUFFS][ERRMSGSIZE];
/*
Message texts are registered into a linked list of 'my_err_head' structs.
Each struct contains (1.) an array of pointers to C character strings with
'\0' termination, (2.) the error number for the first message in the array
(array index 0) and (3.) the error number for the last message in the array
(array index (last - first)).
The array may contain gaps with NULL pointers and pointers to empty strings.
Both kinds of gaps will be translated to "Unknown error %d.", if my_error()
is called with a respective error number.
The list of header structs is sorted in increasing order of error numbers.
Negative error numbers are allowed. Overlap of error numbers is not allowed.
Not registered error numbers will be translated to "Unknown error %d.".
*/
static struct my_err_head
{
struct my_err_head *meh_next; /* chain link */
const char **meh_errmsgs; /* error messages array */
int meh_first; /* error number matching array slot 0 */
int meh_last; /* error number matching last slot */
} my_errmsgs_globerrs = {NULL, globerrs, EE_ERROR_FIRST, EE_ERROR_LAST};
static struct my_err_head *my_errmsgs_list= &my_errmsgs_globerrs;
/*
Error message to user
SYNOPSIS
my_error()
nr Errno
MyFlags Flags
... variable list
RETURN
What (*error_handler_hook)() returns:
0 OK
*/
int my_error(int nr, myf MyFlags, ...)
{
const char *format;
struct my_err_head *meh_p;
va_list args;
char ebuff[ERRMSGSIZE + 20];
DBUG_ENTER("my_error");
DBUG_PRINT("my", ("nr: %d MyFlags: %d errno: %d", nr, MyFlags, errno));
/* Search for the error messages array, which could contain the message. */
for (meh_p= my_errmsgs_list; meh_p; meh_p= meh_p->meh_next)
if (nr <= meh_p->meh_last)
break;
#ifdef SHARED_LIBRARY
if ((meh_p == &my_errmsgs_globerrs) && ! globerrs[0])
init_glob_errs();
#endif
/* get the error message string. Default, if NULL or empty string (""). */
if (! (format= (meh_p && (nr >= meh_p->meh_first)) ?
meh_p->meh_errmsgs[nr - meh_p->meh_first] : NULL) || ! *format)
(void) my_snprintf (ebuff, sizeof(ebuff), "Unknown error %d", nr);
else
{
va_start(args,MyFlags);
(void) my_vsnprintf (ebuff, sizeof(ebuff), format, args);
va_end(args);
}
DBUG_RETURN((*error_handler_hook)(nr, ebuff, MyFlags));
}
/*
Error as printf
SYNOPSIS
my_printf_error()
error Errno
format Format string
MyFlags Flags
... variable list
*/
int my_printf_error(uint error, const char *format, myf MyFlags, ...)
{
va_list args;
char ebuff[ERRMSGSIZE+20];
DBUG_ENTER("my_printf_error");
DBUG_PRINT("my", ("nr: %d MyFlags: %d errno: %d Format: %s",
error, MyFlags, errno, format));
va_start(args,MyFlags);
(void) my_vsnprintf (ebuff, sizeof(ebuff), format, args);
va_end(args);
DBUG_RETURN((*error_handler_hook)(error, ebuff, MyFlags));
}
/*
Give message using error_handler_hook
SYNOPSIS
my_message()
error Errno
str Error message
MyFlags Flags
*/
int my_message(uint error, const char *str, register myf MyFlags)
{
return (*error_handler_hook)(error, str, MyFlags);
}
/*
Register error messages for use with my_error().
SYNOPSIS
my_error_register()
errmsgs array of pointers to error messages
first error number of first message in the array
last error number of last message in the array
DESCRIPTION
The pointer array is expected to contain addresses to NUL-terminated
C character strings. The array contains (last - first + 1) pointers.
NULL pointers and empty strings ("") are allowed. These will be mapped to
"Unknown error" when my_error() is called with a matching error number.
This function registers the error numbers 'first' to 'last'.
No overlapping with previously registered error numbers is allowed.
RETURN
0 OK
!= 0 Error
*/
int my_error_register(const char **errmsgs, int first, int last)
{
struct my_err_head *meh_p;
struct my_err_head **search_meh_pp;
/* Allocate a new header structure. */
if (! (meh_p= (struct my_err_head*) my_malloc(sizeof(struct my_err_head),
MYF(MY_WME))))
return 1;
meh_p->meh_errmsgs= errmsgs;
meh_p->meh_first= first;
meh_p->meh_last= last;
/* Search for the right position in the list. */
for (search_meh_pp= &my_errmsgs_list;
*search_meh_pp;
search_meh_pp= &(*search_meh_pp)->meh_next)
{
if ((*search_meh_pp)->meh_last > first)
break;
}
/* Error numbers must be unique. No overlapping is allowed. */
if (*search_meh_pp && ((*search_meh_pp)->meh_first <= last))
{
my_free((gptr)meh_p, MYF(0));
return 1;
}
/* Insert header into the chain. */
meh_p->meh_next= *search_meh_pp;
*search_meh_pp= meh_p;
return 0;
}
/*
Unregister formerly registered error messages.
SYNOPSIS
my_error_unregister()
first error number of first message
last error number of last message
DESCRIPTION
This function unregisters the error numbers 'first' to 'last'.
These must have been previously registered by my_error_register().
'first' and 'last' must exactly match the registration.
If a matching registration is present, the header is removed from the
list and the pointer to the error messages pointers array is returned.
Otherwise, NULL is returned.
RETURN
non-NULL OK, returns address of error messages pointers array.
NULL Error, no such number range registered.
*/
const char **my_error_unregister(int first, int last)
{
struct my_err_head *meh_p;
struct my_err_head **search_meh_pp;
const char **errmsgs;
/* Search for the registration in the list. */
for (search_meh_pp= &my_errmsgs_list;
*search_meh_pp;
search_meh_pp= &(*search_meh_pp)->meh_next)
{
if (((*search_meh_pp)->meh_first == first) &&
((*search_meh_pp)->meh_last == last))
break;
}
if (! *search_meh_pp)
return NULL;
/* Remove header from the chain. */
meh_p= *search_meh_pp;
*search_meh_pp= meh_p->meh_next;
/* Save the return value and free the header. */
errmsgs= meh_p->meh_errmsgs;
my_free((gptr) meh_p, MYF(0));
return errmsgs;
}
|
