1 /* config - Dictionary where the type of each cell is provided. */
3 /* This is useful to build named structs, like option or property sets. */
5 /* Copyright (c) 2004, 2005, 2006, 2007, 2009, 2010. The SimGrid Team.
6 * All rights reserved. */
8 /* This program is free software; you can redistribute it and/or modify it
9 * under the terms of the license (GNU LGPL) which comes with this package. */
11 #ifndef _XBT_CONFIG_H_
12 #define _XBT_CONFIG_H_
15 #include "xbt/dynar.h"
19 /** @addtogroup XBT_config
20 * @brief Changing the configuration of SimGrid components (grounding feature)
22 * All modules of the SimGrid toolkit can be configured with this API.
23 * User modules and libraries can also use these facilities to handle
24 * their own configuration.
26 * A configuration set contain several \e variables which have a unique name
27 * in the set and can take a given type of value. For example, it may
28 * contain a \a size variable, accepting \e int values.
30 * It is impossible to set a value to a variable which has not been registered before.
31 * Usually, the module registers all the options it accepts in the configuration set,
32 * during its initialization and user code then set and unset values.
34 * The easiest way to register a variable is to use the xbt_str_register_str function,
35 * which accepts a string representation of the config element descriptor. The syntax
36 * is the following: \verbatim <name>:<min nb>_to_<max nb>_<type>\endverbatim
38 * For example, <tt>size:1_to_1_int</tt> describes a variable called \e size which
39 * must take exactly one value, and the value being an integer. Set the maximum to 0 to
40 * disable the upper bound on data count.
42 * Another example could be <tt>outputfiles:0_to_10_string</tt> which describes a variable
43 * called \e outputfiles and which can take between 0 and 10 strings as value.
45 * To some extend, configuration sets can be seen as typed hash structures.
48 * \section XBT_cfg_ex Example of use
50 * \dontinclude config.c
52 * First, let's create a configuration set with some registered variables.
53 * This must be done by the configurable library before the user interactions.
56 * \until end_of_make_set
58 * Now, set and get a single value
59 * \skip get_single_value
63 * And now, set and get a multiple value
64 * \skip get_multiple_value
68 * All those functions throws mismatch_error if asked to deal with an
69 * unregistered variable.
74 /** @defgroup XBT_cfg_use User interface: changing values
77 * This is the only interface you should use unless you want to let your
78 * own code become configurable with this.
80 * If the variable accept at most one value, those functions replace the
81 * current value with the provided one. If max>1, the provided value is
82 * appended to the list.
84 * string values are strdup'ed before use, so you can (and should) free
89 /** @brief Configuration set's data type is opaque. */
90 typedef void* xbt_cfg_t;
92 XBT_PUBLIC(void) xbt_cfg_set(xbt_cfg_t cfg, const char *name, ...);
93 XBT_PUBLIC(void) xbt_cfg_set_vargs(xbt_cfg_t cfg, const char *name,
95 XBT_PUBLIC(void) xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options);
99 Set the value of the cell \a name in \a cfg with the provided value.
101 XBT_PUBLIC(void) xbt_cfg_set_int(xbt_cfg_t cfg, const char *name, int val);
102 XBT_PUBLIC(void) xbt_cfg_set_double(xbt_cfg_t cfg, const char *name,
104 XBT_PUBLIC(void) xbt_cfg_set_string(xbt_cfg_t cfg, const char *name,
106 XBT_PUBLIC(void) xbt_cfg_set_peer(xbt_cfg_t cfg, const char *name,
107 const char *peer, int port);
108 XBT_PUBLIC(void*) xbt_cfg_set_as_string(xbt_cfg_t cfg, const char *name, const char *val);
111 Set the default value of the cell \a name in \a cfg with the provided value.
112 If it was already set to something (possibly from the command line), do nothing.
114 XBT_PUBLIC(void) xbt_cfg_setdefault_int(xbt_cfg_t cfg, const char *name,
116 XBT_PUBLIC(void) xbt_cfg_setdefault_double(xbt_cfg_t cfg, const char *name,
118 XBT_PUBLIC(void) xbt_cfg_setdefault_string(xbt_cfg_t cfg, const char *name,
120 XBT_PUBLIC(void) xbt_cfg_setdefault_peer(xbt_cfg_t cfg, const char *name,
121 const char *host, int port);
125 Remove the provided value from the cell @name in @cfg.
127 XBT_PUBLIC(void) xbt_cfg_rm_int(xbt_cfg_t cfg, const char *name, int val);
128 XBT_PUBLIC(void) xbt_cfg_rm_double(xbt_cfg_t cfg, const char *name,
130 XBT_PUBLIC(void) xbt_cfg_rm_string(xbt_cfg_t cfg, const char *name,
132 XBT_PUBLIC(void) xbt_cfg_rm_peer(xbt_cfg_t cfg, const char *name,
133 const char *peer, int port);
136 Remove the value at position \e pos from the config \e cfg
138 XBT_PUBLIC(void) xbt_cfg_rm_at(xbt_cfg_t cfg, const char *name, int pos);
140 /* rm every values */
141 XBT_PUBLIC(void) xbt_cfg_empty(xbt_cfg_t cfg, const char *name);
143 /* Return if configuration is set by default*/
144 XBT_PUBLIC(int) xbt_cfg_is_default_value(xbt_cfg_t cfg, const char *name);
148 /** @defgroup XBT_cfg_decl Configuration type declaration and memory management
149 * @ingroup XBT_config
154 /** @brief possible content of each configuration cell */
162 xbt_cfgelm_peer, /**< both a char* (representing the peername) and an integer (representing the port) */
164 xbt_cfgelm_any, /* not shown to users to prevent errors */
165 xbt_cfgelm_type_count
166 } e_xbt_cfgelm_type_t;
168 /** \brief Callback types. They get the name of the modified entry, and the position of the changed value */
169 typedef void (*xbt_cfg_cb_t) (const char *, int);
171 XBT_PUBLIC(xbt_cfg_t) xbt_cfg_new(void);
172 XBT_PUBLIC(void) xbt_cfg_cpy(xbt_cfg_t tocopy, /* OUT */
173 xbt_cfg_t * whereto);
174 XBT_PUBLIC(void) xbt_cfg_free(xbt_cfg_t * cfg);
175 XBT_PUBLIC(void) xbt_cfg_dump(const char *name, const char *indent,
180 /** @defgroup XBT_cfg_register Registering stuff
181 * @ingroup XBT_config
183 * This how to add new variables to an existing configuration set. Use it to make your code
188 XBT_PUBLIC(void) xbt_cfg_register(xbt_cfg_t * cfg,
190 const char *description,
191 e_xbt_cfgelm_type_t type,
192 void *default_value, int min, int max,
193 xbt_cfg_cb_t cb_set, xbt_cfg_cb_t cb_rm);
194 XBT_PUBLIC(void) xbt_cfg_unregister(xbt_cfg_t cfg, const char *name);
195 XBT_PUBLIC(void) xbt_cfg_register_str(xbt_cfg_t * cfg, const char *entry);
196 XBT_PUBLIC(void) xbt_cfg_help(xbt_cfg_t cfg);
197 XBT_PUBLIC(void) xbt_cfg_check(xbt_cfg_t cfg);
198 XBT_PUBLIC(e_xbt_cfgelm_type_t) xbt_cfg_get_type(xbt_cfg_t cfg,
201 /** @defgroup XBT_cfg_get Getting the stored values
202 * @ingroup XBT_config
204 * This is how to retrieve the values stored in the configuration set. This is only
205 * intended to configurable code, naturally.
207 * Note that those function return a pointer to the values actually stored
208 * in the set. Do not modify them unless you really know what you're doing.
209 * Likewise, do not free the strings after use, they are not copy of the data,
210 * but the data themselves.
215 XBT_PUBLIC(int) xbt_cfg_get_int(xbt_cfg_t cfg, const char *name);
216 XBT_PUBLIC(double) xbt_cfg_get_double(xbt_cfg_t cfg, const char *name);
217 XBT_PUBLIC(char *) xbt_cfg_get_string(xbt_cfg_t cfg, const char *name);
218 XBT_PUBLIC(void) xbt_cfg_get_peer(xbt_cfg_t cfg, const char *name,
219 char **peer, int *port);
220 XBT_PUBLIC(xbt_dynar_t) xbt_cfg_get_dynar(xbt_cfg_t cfg, const char *name);
222 XBT_PUBLIC(int) xbt_cfg_get_int_at(xbt_cfg_t cfg, const char *name,
224 XBT_PUBLIC(double) xbt_cfg_get_double_at(xbt_cfg_t cfg, const char *name,
226 XBT_PUBLIC(char *) xbt_cfg_get_string_at(xbt_cfg_t cfg, const char *name,
228 XBT_PUBLIC(void) xbt_cfg_get_peer_at(xbt_cfg_t cfg, const char *name,
229 int pos, char **peer, int *port);
234 #endif /* _XBT_CONFIG_H_ */