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
|
/* Copyright (C) 2004 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 "parse_output.h"
#include <my_global.h>
#include <my_sys.h>
#include <m_string.h>
#include <stdio.h>
#include "parse.h"
#include "portability.h"
void trim_space(const char **text, uint *word_len)
{
const char *start= *text;
while (*start != 0 && *start == ' ')
start++;
*text= start;
int len= strlen(start);
const char *end= start + len - 1;
while (end > start && my_isspace(&my_charset_latin1, *end))
end--;
*word_len= (end - start)+1;
}
/*
Parse output of the given command
SYNOPSIS
parse_output_and_get_value()
command the command to execue with popen.
word the word to look for (usually an option name)
result the buffer to store the next word (option value)
input_buffer_len self-explanatory
flag this equals to GET_LINE if we want to get all the line after
the matched word and GET_VALUE otherwise.
DESCRIPTION
Parse output of the "command". Find the "word" and return the next one
if flag is GET_VALUE. Return the rest of the parsed string otherwise.
RETURN
0 - ok, the word has been found
1 - error occured or the word is not found
*/
int parse_output_and_get_value(const char *command, const char *word,
char *result, size_t input_buffer_len,
uint flag)
{
FILE *output;
uint wordlen;
/* should be enough to store the string from the output */
enum { MAX_LINE_LEN= 512 };
char linebuf[MAX_LINE_LEN];
int rc= 1;
wordlen= strlen(word);
/*
Successful return of popen does not tell us whether the command has been
executed successfully: if the command was not found, we'll get EOF
when reading the output buffer below.
*/
if (!(output= popen(command, "r")))
goto err;
/*
We want fully buffered stream. We also want system to
allocate appropriate buffer.
*/
setvbuf(output, NULL, _IOFBF, 0);
while (fgets(linebuf, sizeof(linebuf) - 1, output))
{
uint found_word_len= 0;
char *linep= linebuf;
linebuf[sizeof(linebuf) - 1]= '\0'; /* safety */
/*
Find the word(s) we are looking for in the line
*/
if ((linep= strstr(linep, word)))
{
/*
If we have found our word(s), then move linep past the word(s)
*/
linep+= wordlen;
if (flag & GET_VALUE)
{
trim_space((const char**) &linep, &found_word_len);
if (input_buffer_len <= found_word_len)
goto err;
strmake(result, linep, found_word_len);
}
else /* currently there are only two options */
strmake(result, linep, input_buffer_len - 1);
rc= 0;
break;
}
}
/* we are not interested in the termination status */
pclose(output);
err:
return rc;
}
|
