2 * UCW Library -- Parsing of configuration and command-line options
4 * (c) 2001--2006 Robert Spalek <robert@ucw.cz>
5 * (c) 2003--2006 Martin Mares <mj@ucw.cz>
7 * This software may be freely distributed and used according to the terms
8 * of the GNU Lesser General Public License.
14 #ifdef CONFIG_OWN_GETOPT
15 #include "ucw/getopt/getopt-sh.h"
20 void reset_getopt(void); /** If you want to start parsing of the arguments from the first one again. **/
24 * Safe configuration loading
25 * ~~~~~~~~~~~~~~~~~~~~~~~~~~
27 * These functions can be used to to safely load or reload configuration.
31 * The default config (DEFAULT_CONFIG config option) or NULL if already loaded.
32 * You can set it to something else manually.
34 extern char *cf_def_file;
36 * Name of environment variable that can override what configuration
39 extern char *cf_env_file;
40 int cf_reload(const char *file); /** Reload configuration from @file, replace the old one. **/
41 int cf_load(const char *file); /** Load configuration from @file. **/
43 * Parse some part of configuration passed in @string.
44 * The syntax is the same as in the <<config:,configuration file>>.
46 int cf_set(const char *string);
53 * Direct access to configuration items.
54 * You probably should not need this.
58 * List of operations used on items.
59 * This macro is used to generate internal source code,
60 * but you may be interested in the actions it creates.
62 #define CF_OPERATIONS T(CLOSE) T(SET) T(CLEAR) T(ALL) \
63 T(APPEND) T(PREPEND) T(REMOVE) T(EDIT) T(AFTER) T(BEFORE) T(COPY)
64 /* Closing brace finishes previous block.
65 * Basic attributes (static, dynamic, parsed) can be used with SET.
66 * Dynamic arrays can be used with SET, APPEND, PREPEND.
67 * Sections can be used with SET.
68 * Lists can be used with everything. */
70 enum cf_operation { CF_OPERATIONS }; /** Allowed operations on items. See <<def_CF_OPERATIONS,`CF_OPERATIONS`>>. **/
75 * Searches for a configuration item called @name.
76 * If it is found, it is copied into @item and NULL is returned.
77 * Otherwise, an error is returned and @item is zeroed.
79 char *cf_find_item(const char *name, struct cf_item *item);
81 * Performs a single operation on a given item.
83 char *cf_modify_item(struct cf_item *item, enum cf_operation op, int number, char **pars);
93 * Take everything and write it into @fb.
95 void cf_dump_sections(struct fastbuf *fb);
102 * The configuration system uses journaling to safely reload
103 * configuration. It begins a transaction and tries to load the
104 * configuration. If it fails, it restores the original state.
106 * The behaviour of journal is described in <<reload,reloading configuration>>.
109 struct cf_journal_item; /** Opaque identifier of the journal state. **/
111 * Starts a new transaction. It returns the current state so you can
112 * get back to it. The @new_pool parameter tells if a new memory pool
113 * should be created and used from now.
115 struct cf_journal_item *cf_journal_new_transaction(uns new_pool);
117 * Marks current state as a complete transaction. The @new_pool
118 * parameter tells if the transaction was created with new memory pool
119 * (the parameter must be the same as the one with
120 * @cf_journal_new_transaction() was called with). The @oldj parameter
121 * is the journal state returned from last
122 * @cf_journal_new_transaction() call.
124 void cf_journal_commit_transaction(uns new_pool, struct cf_journal_item *oldj);
126 * Returns to an old journal state, reverting anything the current
127 * transaction did. The @new_pool parameter must be the same as the
128 * one you used when you created the transaction. The @oldj parameter
129 * is the journal state you got from @cf_journal_new_transaction() --
130 * it is the state to return to.
132 void cf_journal_rollback_transaction(uns new_pool, struct cf_journal_item *oldj);
136 * Loading by @cf_getopt()
137 * ~~~~~~~~~~~~~~~~~~~~~~~
141 * Short options for loading configuration by @cf_getopt().
142 * Prepend to your own options.
144 #define CF_SHORT_OPTS "C:S:"
146 * Long options for loading configuration by @cf_getopt().
147 * Prepend to your own options.
149 #define CF_LONG_OPTS {"config", 1, 0, 'C'}, {"set", 1, 0, 'S'}, CF_LONG_OPTS_DEBUG
151 * Use this constant as @long_opts parameter of @cf_getopt() if you do
152 * not have any long options in your program.
154 #define CF_NO_LONG_OPTS (const struct option []) { CF_LONG_OPTS { NULL, 0, 0, 0 } }
156 #define CF_USAGE_TAB ""
159 * This macro provides text describing usage of the configuration
160 * loading options. Concatenate with description of your options and
161 * write to the user, if he/she provides invalid options.
164 "-C, --config filename\t" CF_USAGE_TAB "Override the default configuration file\n\
165 -S, --set sec.item=val\t" CF_USAGE_TAB "Manual setting of a configuration item\n" CF_USAGE_DEBUG
168 #define CF_LONG_OPTS_DEBUG { "dumpconfig", 0, 0, 0x64436667 } ,
169 #define CF_USAGE_DEBUG " --dumpconfig\t" CF_USAGE_TAB "Dump program configuration\n"
171 #define CF_LONG_OPTS_DEBUG
172 #define CF_USAGE_DEBUG
176 * Takes care of parsing the command-line arguments, loading the
177 * default configuration file (<<var_cf_def_file,`cf_def_file`>>) and processing
178 * configuration options. The calling convention is the same as with GNU getopt_long(),
179 * but you must prefix your own short/long options by the
180 * <<def_CF_LONG_OPTS,`CF_LONG_OPTS`>> or <<def_CF_SHORT_OPTS,`CF_SHORT_OPTS`>> or
181 * pass <<def_CF_NO_LONG_OPTS,`CF_NO_LONG_OPTS`>> if there are no long options.
183 * The default configuration file can be overwritten by the --config options,
184 * which must come first. During parsing of all other options, the configuration
185 * is already available.
187 int cf_getopt(int argc, char * const argv[], const char *short_opts, const struct option *long_opts, int *long_index);