| 1 | /********************************************************************\ |
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| 2 | * BitlBee -- An IRC to other IM-networks gateway * |
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| 3 | * * |
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| 4 | * Copyright 2002-2006 Wilmer van der Gaast and others * |
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| 5 | \********************************************************************/ |
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| 6 | |
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| 7 | /* Some stuff to register, handle and save user preferences */ |
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| 8 | |
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| 9 | /* |
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| 10 | This program is free software; you can redistribute it and/or modify |
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| 11 | it under the terms of the GNU General Public License as published by |
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| 12 | the Free Software Foundation; either version 2 of the License, or |
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| 13 | (at your option) any later version. |
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| 14 | |
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| 15 | This program is distributed in the hope that it will be useful, |
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| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 18 | GNU General Public License for more details. |
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| 19 | |
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| 20 | You should have received a copy of the GNU General Public License with |
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| 21 | the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; |
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| 22 | if not, write to the Free Software Foundation, Inc., 59 Temple Place, |
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| 23 | Suite 330, Boston, MA 02111-1307 USA |
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| 24 | */ |
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| 25 | |
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| 26 | /* This used to be specific to irc_t structures, but it's more generic now |
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| 27 | (so it can also be used for account_t structs). It's pretty simple, but |
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| 28 | so far pretty useful. |
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| 29 | |
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| 30 | In short, it just keeps a linked list of settings/variables and it also |
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| 31 | remembers a default value for every setting. And to prevent the user |
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| 32 | from setting invalid values, you can write an evaluator function for |
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| 33 | every setting, which can check a new value and block it by returning |
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| 34 | NULL, or replace it by returning a new value. See struct set.eval. |
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| 35 | One thing that is really missing here is additional data for the |
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| 36 | evaluator. This could be useful to add minimum and maximum values for |
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| 37 | integers, for example. */ |
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| 38 | |
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| 39 | typedef char *(*set_eval) ( struct set *set, char *value ); |
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| 40 | |
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| 41 | typedef struct set |
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| 42 | { |
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| 43 | void *data; /* Here you can save a pointer to the |
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| 44 | object this settings belongs to. */ |
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| 45 | |
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| 46 | char *key; |
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| 47 | char *value; |
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| 48 | char *def; /* Default value. If the set_setstr() function |
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| 49 | notices a new value is exactly the same as |
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| 50 | the default, value gets set to NULL. So when |
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| 51 | you read a setting, don't forget about this! |
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| 52 | In fact, you should only read values using |
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| 53 | set_getstr/int(). */ |
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| 54 | |
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| 55 | int flags; /* See account.h, for example. set.c doesn't use |
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| 56 | this (yet?). */ |
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| 57 | |
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| 58 | /* Eval: Returns NULL if the value is incorrect or exactly the |
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| 59 | passed value variable. When returning a corrected value, |
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| 60 | set_setstr() should be able to free() the returned string! */ |
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| 61 | set_eval eval; |
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| 62 | struct set *next; |
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| 63 | } set_t; |
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| 64 | |
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| 65 | /* Should be pretty clear. */ |
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| 66 | set_t *set_add( set_t **head, char *key, char *def, set_eval eval, void *data ); |
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| 67 | |
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| 68 | /* Returns the raw set_t. Might be useful sometimes. */ |
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| 69 | set_t *set_find( set_t **head, char *key ); |
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| 70 | |
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| 71 | /* Returns a pointer to the string value of this setting. Don't modify the |
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| 72 | returned string, and don't free() it! */ |
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| 73 | G_MODULE_EXPORT char *set_getstr( set_t **head, char *key ); |
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| 74 | |
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| 75 | /* Get an integer. In previous versions set_getint() was also used to read |
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| 76 | boolean values, but this SHOULD be done with set_getbool() now! */ |
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| 77 | G_MODULE_EXPORT int set_getint( set_t **head, char *key ); |
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| 78 | G_MODULE_EXPORT int set_getbool( set_t **head, char *key ); |
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| 79 | |
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| 80 | /* set_setstr() strdup()s the given value, so after using this function |
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| 81 | you can free() it, if you want. */ |
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| 82 | int set_setstr( set_t **head, char *key, char *value ); |
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| 83 | int set_setint( set_t **head, char *key, int value ); |
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| 84 | void set_del( set_t **head, char *key ); |
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| 85 | |
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| 86 | /* Two very useful generic evaluators. */ |
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| 87 | char *set_eval_int( set_t *set, char *value ); |
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| 88 | char *set_eval_bool( set_t *set, char *value ); |
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| 89 | |
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| 90 | /* Some not very generic evaluators that really shouldn't be here... */ |
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| 91 | char *set_eval_to_char( set_t *set, char *value ); |
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| 92 | char *set_eval_ops( set_t *set, char *value ); |
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| 93 | char *set_eval_charset( set_t *set, char *value ); |
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