source: set.c @ 71004a3

  /********************************************************************\
  * BitlBee -- An IRC to other IM-networks gateway                     *
  *                                                                    *
  * Copyright 2002-2013 Wilmer van der Gaast and others                *
  \********************************************************************/

/* Some stuff to register, handle and save user preferences             */

/*
  This program is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation; either version 2 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License with
  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
  Suite 330, Boston, MA  02111-1307  USA
*/

#define BITLBEE_CORE
#include "bitlbee.h"

/* Used to use NULL for this, but NULL is actually a "valid" value. */
char *SET_INVALID = "nee";

set_t *set_add( set_t **head, const char *key, const char *def, set_eval eval, void *data )
{
        set_t *s = set_find( head, key );
        
        /* Possibly the setting already exists. If it doesn't exist yet,
           we create it. If it does, we'll just change the default. */
        if( !s )
        {
                if( ( s = *head ) )
                {
                        /* Sorted insertion. Special-case insertion at the start. */
                        if( strcmp( key, s->key ) < 0 )
                        {
                                s = g_new0( set_t, 1 );
                                s->next = *head;
                                *head = s;
                        }
                        else
                        {
                                while( s->next && strcmp( key, s->next->key ) > 0 )
                                        s = s->next;
                                set_t *last_next = s->next;
                                s->next = g_new0( set_t, 1 );
                                s = s->next;
                                s->next = last_next;
                        }
                }
                else
                {
                        s = *head = g_new0( set_t, 1 );
                }
                s->key = g_strdup( key );
        }
        
        if( s->def )
        {
                g_free( s->def );
                s->def = NULL;
        }
        if( def ) s->def = g_strdup( def );
        
        s->eval = eval;
        s->data = data;
        
        return s;
}

set_t *set_find( set_t **head, const char *key )
{
        set_t *s = *head;
        
        while( s )
        {
                if( g_strcasecmp( s->key, key ) == 0 ||
                    ( s->old_key && g_strcasecmp( s->old_key, key ) == 0 ) )
                        break;
                s = s->next;
        }
        
        return s;
}

char *set_getstr( set_t **head, const char *key )
{
        set_t *s = set_find( head, key );
        
        if( !s || ( !s->value && !s->def ) )
                return NULL;
        
        return set_value( s );
}

int set_getint( set_t **head, const char *key )
{
        char *s = set_getstr( head, key );
        int i = 0;
        
        if( !s )
                return 0;
        
        if( sscanf( s, "%d", &i ) != 1 )
                return 0;
        
        return i;
}

int set_getbool( set_t **head, const char *key )
{
        char *s = set_getstr( head, key );
        
        if( !s )
                return 0;
        
        return bool2int( s );
}

int set_isvisible( set_t *set )
{
        /* the default value is not stored in value, only in def */
        return !( ( set->flags & SET_HIDDEN ) ||
                  ( ( set->flags & SET_HIDDEN_DEFAULT ) &&
                    ( set->value == NULL ) ) );
}

int set_setstr( set_t **head, const char *key, char *value )
{
        set_t *s = set_find( head, key );
        char *nv = value;
        
        if( !s )
                /*
                Used to do this, but it never really made sense.
                s = set_add( head, key, NULL, NULL, NULL );
                */
                return 0;
        
        if( value == NULL && ( s->flags & SET_NULL_OK ) == 0 )
                return 0;
        
        /* Call the evaluator. For invalid values, evaluators should now
           return SET_INVALID, but previously this was NULL. Try to handle
           that too if NULL is not an allowed value for this setting. */
        if( s->eval && ( ( nv = s->eval( s, value ) ) == SET_INVALID ||
                         ( ( s->flags & SET_NULL_OK ) == 0 && nv == NULL ) ) )
                return 0;
        
        if( s->value )
        {
                g_free( s->value );
                s->value = NULL;
        }
        
        /* If there's a default setting and it's equal to what we're trying to
           set, stick with s->value = NULL. Otherwise, remember the setting. */
        if( !s->def || ( strcmp( nv, s->def ) != 0 ) )
                s->value = g_strdup( nv );
        
        if( nv != value )
                g_free( nv );
        
        return 1;
}

int set_setint( set_t **head, const char *key, int value )
{
        char s[24];     /* Not quite 128-bit clean eh? ;-) */
        
        g_snprintf( s, sizeof( s ), "%d", value );
        return set_setstr( head, key, s );
}

void set_del( set_t **head, const char *key )
{
        set_t *s = *head, *t = NULL;
        
        while( s )
        {
                if( g_strcasecmp( s->key, key ) == 0 )
                        break;
                s = (t=s)->next;
        }
        if( s )
        {
                if( t )
                        t->next = s->next;
                else
                        *head = s->next;
                
                g_free( s->key );
                g_free( s->old_key );
                g_free( s->value );
                g_free( s->def );
                g_free( s );
        }
}

int set_reset( set_t **head, const char *key )
{
        set_t *s;
        
        s = set_find( head, key );
        if( s )
                return set_setstr( head, key, s->def );
        
        return 0;
}

char *set_eval_int( set_t *set, char *value )
{
        char *s = value;
        
        /* Allow a minus at the first position. */
        if( *s == '-' )
                s ++;
        
        for( ; *s; s ++ )
                if( !isdigit( *s ) )
                        return SET_INVALID;
        
        return value;
}

char *set_eval_bool( set_t *set, char *value )
{
        return is_bool( value ) ? value : SET_INVALID;
}

char *set_eval_list( set_t *set, char *value )
{
        GSList *options = set->eval_data, *opt;
        
        for( opt = options; opt; opt = opt->next )
                if( strcmp( value, opt->data ) == 0 )
                        return value;
        
        /* TODO: It'd be nice to show the user a list of allowed values,
                 but we don't have enough context here to do that. May
                 want to fix that. */
        
        return NULL;
}

char *set_eval_to_char( set_t *set, char *value )
{
        char *s = g_new( char, 3 );
        
        if( *value == ' ' )
                strcpy( s, " " );
        else
                sprintf( s, "%c ", *value );
        
        return s;
}

char *set_eval_oauth( set_t *set, char *value )
{
        account_t *acc = set->data;
        
        if( bool2int( value ) && strcmp( acc->pass, PASSWORD_PENDING ) == 0 )
                *acc->pass = '\0';
        
        return set_eval_bool( set, value );
}