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 * <center><table><tr><td><b>Top</b> <td> [\ref index]::[\ref XBT_API]
23 * <tr><td><b>Prev</b> <td> [\ref XBT_error]
24 * <tr><td><b>Next</b> <td> [\ref XBT_dynar]
25 * <tr><td><b>Down</b> <td> [\ref XBT_cfg_use] </table></center>
27 * All modules of the SimGrid toolkit can be configured with this API.
28 * User modules and libraries can also use these facilities to handle
29 * their own configuration.
31 * A configuration set contain several \e variables which have a unique name
32 * in the set and can take a given type of value. For example, it may
33 * contain a \a size variable, accepting \e int values.
35 * It is impossible to set a value to a variable which has not been registered before.
36 * Usually, the module registers all the options it accepts in the configuration set,
37 * during its initialization and user code then set and unset values.
39 * The easiest way to register a variable is to use the xbt_str_register_str function,
40 * which accepts a string representation of the config element descriptor. The syntax
41 * is the following: \verbatim <name>:<min nb>_to_<max nb>_<type>\endverbatim
43 * For example, <tt>size:1_to_1_int</tt> describes a variable called \e size which
44 * must take exactly one value, and the value being an integer. Set the maximum to 0 to
45 * disable the upper bound on data count.
47 * Another example could be <tt>outputfiles:0_to_10_string</tt> which describes a variable
48 * called \e outputfiles and which can take between 0 and 10 strings as value.
50 * To some extend, configuration sets can be seen as typed hash structures.
52 * \todo This great mechanism is not used in SimGrid yet...
55 * \section XBT_cfg_ex Example of use
57 * \dontinclude config_usage.c
59 * First, let's create a configuration set with some registered variables.
60 * This must be done by the configurable library before the user interactions.
63 * \until end_of_make_set
65 * Now, set and get a single value
66 * \skip get_single_value
70 * And now, set and get a multiple value
71 * \skip get_multiple_value
75 * All those functions throws mismatch_error if asked to deal with an
76 * unregistered variable.
82 /** @defgroup XBT_cfg_use User interface: changing values
85 * <center><table><tr><td><b>Top</b> <td> [\ref index]::[\ref XBT_API]::[\ref XBT_config]
87 * <tr><td><b>Next</b> <td> [\ref XBT_cfg_decl] </table></center>
89 * This is the only interface you should use unless you want to let your
90 * own code become configurable with this.
92 * If the variable accept at most one value, those functions replace the
93 * current value with the provided one. If max>1, the provided value is
94 * appended to the list.
96 * string values are strdup'ed before use, so you can (and should) free
102 void xbt_cfg_set(xbt_cfg_t cfg, const char *name, ...);
103 void xbt_cfg_set_vargs(xbt_cfg_t cfg, const char *name, va_list pa);
104 void xbt_cfg_set_parse(xbt_cfg_t cfg, const char *options);
108 Set the value of the cell \a name in \a cfg with the provided value.
110 void xbt_cfg_set_int (xbt_cfg_t cfg, const char *name,
112 void xbt_cfg_set_double(xbt_cfg_t cfg, const char *name,
114 void xbt_cfg_set_string(xbt_cfg_t cfg, const char *name,
116 void xbt_cfg_set_host (xbt_cfg_t cfg, const char *name,
117 const char *host,int port);
120 Remove the provided value from the cell @name in @cfg.
122 void xbt_cfg_rm_int (xbt_cfg_t cfg, const char *name,
124 void xbt_cfg_rm_double(xbt_cfg_t cfg, const char *name,
126 void xbt_cfg_rm_string(xbt_cfg_t cfg, const char *name,
128 void xbt_cfg_rm_host (xbt_cfg_t cfg, const char *name,
129 const char *host,int port);
132 Remove the value at position \e pos from the config \e cfg
134 void xbt_cfg_rm_at (xbt_cfg_t cfg, const char *name, int pos);
136 /* rm every values */
137 void xbt_cfg_empty(xbt_cfg_t cfg, const char *name);
141 /** @defgroup XBT_cfg_decl Type declaration and memory management
142 * @ingroup XBT_config
144 * <center><table><tr><td><b>Top</b> <td> [\ref index]::[\ref XBT_API]::[\ref XBT_config]
145 * <tr><td><b>Prev</b> <td> [\ref XBT_cfg_use]
146 * <tr><td><b>Next</b> <td> [\ref XBT_cfg_register] </table></center>
150 /** @brief Configuration set are only special dynars. But don't rely on it, it may change. */
151 typedef xbt_dynar_t xbt_cfg_t;
153 /** @brief possible content of each configuration cell */
155 xbt_cfgelm_int=0, /**< int */
156 xbt_cfgelm_double, /**< double */
157 xbt_cfgelm_string, /**< char* */
158 xbt_cfgelm_host, /**< both a char* (representing the hostname) and an integer (representing the port) */
160 xbt_cfgelm_any, /* not shown to users to prevent errors */
161 xbt_cfgelm_type_count
162 } e_xbt_cfgelm_type_t;
164 /** \brief Callback types. They get the name of the modified entry, and the position of the changed value */
165 typedef void (*xbt_cfg_cb_t)(const char*, int);
167 xbt_cfg_t xbt_cfg_new (void);
168 void xbt_cfg_cpy(xbt_cfg_t tocopy, /* OUT */ xbt_cfg_t *whereto);
169 void xbt_cfg_free(xbt_cfg_t *cfg);
170 void xbt_cfg_dump(const char *name,const char*indent,xbt_cfg_t cfg);
174 /** @defgroup XBT_cfg_register Registering stuff
175 * @ingroup XBT_config
177 * <center><table><tr><td><b>Top</b> <td> [\ref index]::[\ref XBT_API]::[\ref XBT_config]
178 * <tr><td><b>Prev</b> <td> [\ref XBT_cfg_decl]
179 * <tr><td><b>Next</b> <td> [\ref XBT_cfg_get] </table></center>
181 * This how to add new variables to an existing configuration set. Use it to make your code
186 void xbt_cfg_register(xbt_cfg_t cfg,
187 const char *name, e_xbt_cfgelm_type_t type,
189 xbt_cfg_cb_t cb_set, xbt_cfg_cb_t cb_rm);
190 void xbt_cfg_unregister(xbt_cfg_t cfg, const char *name);
191 void xbt_cfg_register_str(xbt_cfg_t cfg, const char *entry);
192 void xbt_cfg_check(xbt_cfg_t cfg);
193 e_xbt_cfgelm_type_t xbt_cfg_get_type(xbt_cfg_t cfg, const char *name);
195 /** @defgroup XBT_cfg_get Getting the stored values
196 * @ingroup XBT_config
198 * <center><table><tr><td><b>Top</b> <td> [\ref index]::[\ref XBT_API]::[\ref XBT_config]
199 * <tr><td><b>Prev</b> <td> [\ref XBT_cfg_register]
200 * <tr><td> Next <td> </table></center>
202 * This is how to retrieve the values stored in the configuration set. This is only
203 * intended to configurable code, naturally.
205 * Note that those function return a pointer to the values actually stored
206 * in the set. Do not modify them unless you really know what you're doing.
207 * Likewise, do not free the strings after use, they are not copy of the data,
208 * but the data themselves.
213 int xbt_cfg_get_int (xbt_cfg_t cfg, const char *name);
214 double xbt_cfg_get_double(xbt_cfg_t cfg, const char *name);
215 char* xbt_cfg_get_string(xbt_cfg_t cfg, const char *name);
216 void xbt_cfg_get_host (xbt_cfg_t cfg, const char *name, char **host, int *port);
217 xbt_dynar_t xbt_cfg_get_dynar (xbt_cfg_t cfg, const char *name);
219 int xbt_cfg_get_int_at (xbt_cfg_t cfg, const char *name, int pos);
220 double xbt_cfg_get_double_at(xbt_cfg_t cfg, const char *name, int pos);
221 char* xbt_cfg_get_string_at(xbt_cfg_t cfg, const char *name, int pos);
222 void xbt_cfg_get_host_at (xbt_cfg_t cfg, const char *name, int pos, char **host, int *port);
228 #endif /* _XBT_CONFIG_H_ */