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32 .Nd configuration file parsing library
39 .Fa "struct figpar_config options[]"
40 .Fa "const char *path"
41 .Fa "int \*[lp]*unknown\*[rp]\*[lp]struct figpar_config *option"
44 .Fa "char *value\*[rp]"
45 .Fa "uint8_t processing_options"
47 .Ft "struct figpar_config *"
49 .Fa "struct figpar_config options[]"
50 .Fa "const char *directive"
56 .Fa "const char *find"
57 .Fa "const char *replace"
61 .Fa "const char *source"
62 .Fa "const char *find"
79 library provides a light-weight,
80 portable framework for parsing configuration
87 within the file pointed to by
89 to find directives and values which are then made available to the application.
91 Due to the fact that configuration files may have basic syntax differences,
92 the library does not attempt to impose any structure on the data but instead
93 provides raw data to a set of callback functions.
94 These callback functions can in-turn initiate abort through their return value,
95 allowing custom syntax validation during parsing.
97 Configuration directives,
99 and callback functions are provided through data structures defined in
101 .Bd -literal -offset indent
102 struct figpar_config {
103 enum figpar_cfgtype type; /* value type */
104 const char *directive; /* keyword */
105 union figpar_cfgvalue value; /* value */
107 /* Pointer to function used when directive is found */
108 int (*action)(struct figpar_config *option, uint32_t line,
109 char *directive, char *value);
112 enum figpar_cfgtype {
113 FIGPAR_TYPE_NONE = 0x0000, /* directives with no value */
114 FIGPAR_TYPE_BOOL = 0x0001, /* boolean */
115 FIGPAR_TYPE_INT = 0x0002, /* signed 32 bit integer */
116 FIGPAR_TYPE_UINT = 0x0004, /* unsigned 32 bit integer */
117 FIGPAR_TYPE_STR = 0x0008, /* string pointer */
118 FIGPAR_TYPE_STRARRAY = 0x0010, /* string array pointer */
119 FIGPAR_TYPE_DATA1 = 0x0020, /* void data type-1 (open) */
120 FIGPAR_TYPE_DATA2 = 0x0040, /* void data type-2 (open) */
121 FIGPAR_TYPE_DATA3 = 0x0080, /* void data type-3 (open) */
122 FIGPAR_TYPE_RESERVED1 = 0x0100, /* reserved data type-1 */
123 FIGPAR_TYPE_RESERVED2 = 0x0200, /* reserved data type-2 */
124 FIGPAR_TYPE_RESERVED3 = 0x0400, /* reserved data type-3 */
127 union figpar_cfgvalue {
128 void *data; /* Pointer to NUL-terminated string */
129 char *str; /* Pointer to NUL-terminated string */
130 char **strarray; /* Pointer to an array of strings */
131 int32_t num; /* Signed 32-bit integer value */
132 uint32_t u_num; /* Unsigned 32-bit integer value */
133 uint32_t boolean:1; /* Boolean integer value (0 or 1) */
138 .Fa processing_options
141 is a mask of bit fields which indicate various
143 The possible flags are:
144 .Bl -tag -width FIGPAR_BREAK_ON_SEMICOLON
145 .It Dv FIGPAR_BREAK_ON_EQUALS
148 is normally considered part of the directive.
149 This flag enables terminating the directive at the equals sign.
150 Also makes equals sign optional and transient.
151 .It Dv FIGPAR_BREAK_ON_SEMICOLON
154 is normally considered part of the value.
155 This flag enables terminating the value at the semicolon.
156 Also allows multiple statements on a single line separated by semicolon.
157 .It Dv FIGPAR_CASE_SENSITIVE
158 Normally directives are matched case insensitively using
160 This flag enables directive matching to be case sensitive.
161 .It Dv FIGPAR_REQUIRE_EQUALS
162 If a directive is not followed by an equals,
163 processing is aborted.
164 .It Dv FIGPAR_STRICT_EQUALS
165 Equals must be part of the directive to be considered a delimiter between
171 struct array pointer can be NULL and every directive will run the
175 The directive for each figpar_config item in the
177 options argument is matched against each parsed directive using
179 until a match is found.
183 function for that figpar_config directive is run with the line number,
186 Otherwise if no match,
190 .Pq with the same arguments .
198 aborts reading the file and returns the error value to its caller.
200 .Fn get_config_option
201 traverses the options-array and returns the option that matches via
203 or if no match a pointer to a static dummy struct is returned
204 .Pq whose values are all zero or NULL .
207 .Fa "struct figpar_config"
208 is entirely optional as-is the use of
209 .Fa "enum figpar_cfgtype"
211 .Fa "union figpar_cfgvalue" .
213 a NULL pointer can be passed to
215 for the first argument while providing a simple
219 that populates a singly-linked list of a struct containing the
225 miscellaneous string manipulation routines are provided by
227 .Bl -tag -width strexpandnl()
229 Replace all occurrences of
236 Count the number of occurrences of one string that appear in the
239 Return value is the total count.
240 An example use would be to show how large a block of memory needs to be for a
244 Expand escape sequences in a buffer pointed to by
247 Expand only the escaped newlines in a buffer pointed to by
250 Convert a string to lower case.
257 library first appeared in
260 .An Devin Teske Aq dteske@FreeBSD.org
262 This is the first implementation of the library,
263 and the interface may be subject to refinement.