1 /**
2 * collectd - src/utils_parse_option.c
3 * Copyright (C) 2008 Florian Forster
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Florian octo Forster <octo at collectd.org>
25 **/
27 #include "collectd.h"
28 #include "utils_parse_option.h"
30 int parse_string (char **ret_buffer, char **ret_string)
31 {
32 char *buffer;
33 char *string;
35 buffer = *ret_buffer;
37 /* Eat up leading spaces. */
38 string = buffer;
39 while (isspace ((int) *string))
40 string++;
41 if (*string == 0)
42 return (1);
44 /* A quoted string */
45 if (*string == '"')
46 {
47 char *dst;
49 string++;
50 if (*string == 0)
51 return (1);
53 dst = string;
54 buffer = string;
55 while ((*buffer != '"') && (*buffer != 0))
56 {
57 /* Un-escape backslashes */
58 if (*buffer == '\\')
59 {
60 buffer++;
61 /* Catch a backslash at the end of buffer */
62 if (*buffer == 0)
63 return (-1);
64 }
65 *dst = *buffer;
66 buffer++;
67 dst++;
68 }
69 /* No quote sign has been found */
70 if (*buffer == 0)
71 return (-1);
73 *dst = 0;
74 dst++;
75 *buffer = 0;
76 buffer++;
78 /* Check for trailing spaces. */
79 if ((*buffer != 0) && !isspace ((int) *buffer))
80 return (-1);
81 }
82 else /* an unquoted string */
83 {
84 buffer = string;
85 while ((*buffer != 0) && !isspace ((int) *buffer))
86 buffer++;
87 if (*buffer != 0)
88 {
89 *buffer = 0;
90 buffer++;
91 }
92 }
94 /* Eat up trailing spaces */
95 while (isspace ((int) *buffer))
96 buffer++;
98 *ret_buffer = buffer;
99 *ret_string = string;
101 return (0);
102 } /* int parse_string */
104 /*
105 * parse_option
106 * ------------
107 * Parses an ``option'' as used with the unixsock and exec commands. An
108 * option is of the form:
109 * name0="value"
110 * name1="value with \"quotes\""
111 * name2="value \\ backslash"
112 * However, if the value does *not* contain a space character, you can skip
113 * the quotes.
114 */
115 int parse_option (char **ret_buffer, char **ret_key, char **ret_value)
116 {
117 char *buffer;
118 char *key;
119 char *value;
120 int status;
122 buffer = *ret_buffer;
124 /* Eat up leading spaces */
125 key = buffer;
126 while (isspace ((int) *key))
127 key++;
128 if (*key == 0)
129 return (1);
131 /* Look for the equal sign */
132 buffer = key;
133 while (isalnum ((int) *buffer) || *buffer == '_' || *buffer == ':')
134 buffer++;
135 if ((*buffer != '=') || (buffer == key))
136 return (1);
137 *buffer = 0;
138 buffer++;
139 /* Empty values must be written as "" */
140 if (isspace ((int) *buffer) || (*buffer == 0))
141 return (-1);
143 status = parse_string (&buffer, &value);
144 if (status != 0)
145 return (-1);
147 /* NB: parse_string will have eaten up all trailing spaces. */
149 *ret_buffer = buffer;
150 *ret_key = key;
151 *ret_value = value;
153 return (0);
154 } /* int parse_option */
156 /* vim: set sw=2 ts=8 tw=78 et : */