source: set.c @ 90417ce

/********************************************************************\
  * 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., 51 Franklin St.,
  Fifth Floor, Boston, MA  02110-1301  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 || (g_strcmp0(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 = g_strdup_printf("%d", value);
        int retval = set_setstr(head, key, s);

        g_free(s);
        return retval;
}

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 (!g_ascii_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);
}