3 /* config - Dictionary where the type of each cell is provided. */
5 /* This is useful to build named structs, like option or property sets. */
7 /* Copyright (c) 2001,2002,2003,2004 Martin Quinson. All rights reserved. */
9 /* This program is free software; you can redistribute it and/or modify it
10 * under the terms of the license (GNU LGPL) which comes with this package. */
12 #ifndef _XBT_CONFIG_H_
13 #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.
47 * \todo This great mechanism is not used in SimGrid yet...
50 * \section XBT_cfg_ex Example of use
52 * \dontinclude config.c
54 * First, let's create a configuration set with some registered variables.
55 * This must be done by the configurable library before the user interactions.
58 * \until end_of_make_set
60 * Now, set and get a single value
61 * \skip get_single_value
65 * And now, set and get a multiple value
66 * \skip get_multiple_value
70 * All those functions throws mismatch_error if asked to deal with an
71 * unregistered variable.
77 /** @defgroup XBT_cfg_use User interface: changing values
80 * This is the only interface you should use unless you want to let your
81 * own code become configurable with this.
83 * If the variable accept at most one value, those functions replace the
84 * current value with the provided one. If max>1, the provided value is
85 * appended to the list.
87 * string values are strdup'ed before use, so you can (and should) free
93 /** @brief Configuration set are only special dynars. But don't rely on it, it may change. */
94 typedef xbt_dynar_t xbt_cfg_t;
96 XBT_PUBLIC(void) xbt_cfg_set(xbt_cfg_t cfg, const char *name, ...);
97 XBT_PUBLIC(void) xbt_cfg_set_vargs(xbt_cfg_t cfg, const char *name, va_list pa);
98 XBT_PUBLIC(void) xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options);
102 Set the value of the cell \a name in \a cfg with the provided value.
104 XBT_PUBLIC(void) xbt_cfg_set_int (xbt_cfg_t cfg, const char *name,
106 XBT_PUBLIC(void) xbt_cfg_set_double(xbt_cfg_t cfg, const char *name,
108 XBT_PUBLIC(void) xbt_cfg_set_string(xbt_cfg_t cfg, const char *name,
110 XBT_PUBLIC(void) xbt_cfg_set_peer (xbt_cfg_t cfg, const char *name,
111 const char *peer,int port);
114 Remove the provided value from the cell @name in @cfg.
116 XBT_PUBLIC(void) xbt_cfg_rm_int (xbt_cfg_t cfg, const char *name,
118 XBT_PUBLIC(void) xbt_cfg_rm_double(xbt_cfg_t cfg, const char *name,
120 XBT_PUBLIC(void) xbt_cfg_rm_string(xbt_cfg_t cfg, const char *name,
122 XBT_PUBLIC(void) xbt_cfg_rm_peer (xbt_cfg_t cfg, const char *name,
123 const char *peer,int port);
126 Remove the value at position \e pos from the config \e cfg
128 XBT_PUBLIC(void) xbt_cfg_rm_at (xbt_cfg_t cfg, const char *name, int pos);
130 /* rm every values */
131 XBT_PUBLIC(void) xbt_cfg_empty(xbt_cfg_t cfg, const char *name);
135 /** @defgroup XBT_cfg_decl Configuration type declaration and memory management
136 * @ingroup XBT_config
141 /** @brief possible content of each configuration cell */
143 xbt_cfgelm_int=0, /**< int */
144 xbt_cfgelm_double, /**< double */
145 xbt_cfgelm_string, /**< char* */
146 xbt_cfgelm_peer, /**< both a char* (representing the peername) and an integer (representing the port) */
148 xbt_cfgelm_any, /* not shown to users to prevent errors */
149 xbt_cfgelm_type_count
150 } e_xbt_cfgelm_type_t;
152 /** \brief Callback types. They get the name of the modified entry, and the position of the changed value */
153 typedef void (*xbt_cfg_cb_t)(const char*, int);
155 XBT_PUBLIC(xbt_cfg_t) xbt_cfg_new (void);
156 XBT_PUBLIC(void) xbt_cfg_cpy(xbt_cfg_t tocopy, /* OUT */ xbt_cfg_t *whereto);
157 XBT_PUBLIC(void) xbt_cfg_free(xbt_cfg_t *cfg);
158 XBT_PUBLIC(void) xbt_cfg_dump(const char *name,const char*indent,xbt_cfg_t cfg);
162 /** @defgroup XBT_cfg_register Registering stuff
163 * @ingroup XBT_config
165 * This how to add new variables to an existing configuration set. Use it to make your code
170 XBT_PUBLIC(void) xbt_cfg_register(xbt_cfg_t cfg,
171 const char *name, e_xbt_cfgelm_type_t type,
173 xbt_cfg_cb_t cb_set, xbt_cfg_cb_t cb_rm);
174 XBT_PUBLIC(void) xbt_cfg_unregister(xbt_cfg_t cfg, const char *name);
175 XBT_PUBLIC(void) xbt_cfg_register_str(xbt_cfg_t cfg, const char *entry);
176 XBT_PUBLIC(void) xbt_cfg_check(xbt_cfg_t cfg);
177 XBT_PUBLIC(e_xbt_cfgelm_type_t) xbt_cfg_get_type(xbt_cfg_t cfg, const char *name);
179 /** @defgroup XBT_cfg_get Getting the stored values
180 * @ingroup XBT_config
182 * This is how to retrieve the values stored in the configuration set. This is only
183 * intended to configurable code, naturally.
185 * Note that those function return a pointer to the values actually stored
186 * in the set. Do not modify them unless you really know what you're doing.
187 * Likewise, do not free the strings after use, they are not copy of the data,
188 * but the data themselves.
193 XBT_PUBLIC(int) xbt_cfg_get_int (xbt_cfg_t cfg, const char *name);
194 XBT_PUBLIC(double) xbt_cfg_get_double(xbt_cfg_t cfg, const char *name);
195 XBT_PUBLIC(char*) xbt_cfg_get_string(xbt_cfg_t cfg, const char *name);
196 XBT_PUBLIC(void) xbt_cfg_get_peer (xbt_cfg_t cfg, const char *name, char **peer, int *port);
197 XBT_PUBLIC(xbt_dynar_t) xbt_cfg_get_dynar (xbt_cfg_t cfg, const char *name);
199 XBT_PUBLIC(int) xbt_cfg_get_int_at (xbt_cfg_t cfg, const char *name, int pos);
200 XBT_PUBLIC(double) xbt_cfg_get_double_at(xbt_cfg_t cfg, const char *name, int pos);
201 XBT_PUBLIC(char*) xbt_cfg_get_string_at(xbt_cfg_t cfg, const char *name, int pos);
202 XBT_PUBLIC(void) xbt_cfg_get_peer_at (xbt_cfg_t cfg, const char *name, int pos, char **peer, int *port);
208 #endif /* _XBT_CONFIG_H_ */