conf.c

/*
    DeaDBeeF - ultimate music player for GNU/Linux systems with X11
    Copyright (C) 2009-2011 Alexey Yakovenko <waker@users.sourceforge.net>

    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
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
#include <inttypes.h>
#include "conf.h"
#include "threading.h"

#define min(x,y) ((x)<(y)?(x):(y))

static DB_conf_item_t *conf_items;
static int changed = 0;
static uintptr_t mutex;

void
conf_init (void) {
    mutex = mutex_create ();
}

void
conf_lock (void) {
    mutex_lock (mutex);
}

void
conf_unlock (void) {
    mutex_unlock (mutex);
}

void
conf_free (void) {
    mutex_lock (mutex);
    DB_conf_item_t *next = NULL;
    for (DB_conf_item_t *it = conf_items; it; it = next) {
        next = it->next;
        conf_item_free (it);
    }
    conf_items = NULL;
    changed = 0;
    mutex_free (mutex);
    mutex = 0;
}

int
conf_load (void) {
    extern char dbconfdir[1024]; // $HOME/.config/deadbeef
    char str[1024];
    snprintf (str, 1024, "%s/config", dbconfdir);
    FILE *fp = fopen (str, "rt");
    if (!fp) {
        fprintf (stderr, "failed to load config file\n");
        return -1;
    }
    conf_lock ();
    int line = 0;
    while (fgets (str, 1024, fp) != NULL) {
        line++;
        if (str[0] == '#' || str[0] <= 0x20) {
            continue;
        }
        uint8_t *p = (uint8_t *)str;
        while (*p && *p > 0x20) {
            p++;
        }
        if (!*p) {
            fprintf (stderr, "error in config file line %d\n", line);
            continue;
        }
        *p = 0;
        p++;
        // skip whitespace
        while (*p && *p <= 0x20) {
            p++;
        }
        if (!*p) {
            fprintf (stderr, "error in config file line %d\n", line);
            continue;
        }
        char *value = p;
        // remove trailing trash
        while (*p && *p >= 0x20) {
            p++;
        }
        *p = 0;
        // new items are appended, to preserve order
        conf_set_str (str, value);
    }
    fclose (fp);
    changed = 0;
    conf_unlock ();
    return 0;
}

int
conf_save (void) {
    extern char dbconfdir[1024]; // $HOME/.config/deadbeef
    char str[1024];
    snprintf (str, 1024, "%s/config", dbconfdir);
    FILE *fp = fopen (str, "w+t");
    if (!fp) {
        fprintf (stderr, "failed to open config file for writing\n");
        return -1;
    }
    conf_lock ();
    for (DB_conf_item_t *it = conf_items; it; it = it->next) {
        fprintf (fp, "%s %s\n", it->key, it->value);
    }
    fclose (fp);
    conf_unlock ();
    return 0;
}

void
conf_item_free (DB_conf_item_t *it) {
    conf_lock ();
    if (it) {
        if (it->key) {
            free (it->key);
        }
        if (it->value) {
            free (it->value);
        }
        free (it);
    }
    conf_unlock ();
}

const char *
conf_get_str_fast (const char *key, const char *def) {
    for (DB_conf_item_t *it = conf_items; it; it = it->next) {
        if (!strcasecmp (key, it->key)) {
            return it->value;
        }
    }
    return def;
}

void
conf_get_str (const char *key, const char *def, char *buffer, int buffer_size) {
    conf_lock ();
    const char *out = conf_get_str_fast (key, def);
    if (out) {
        int n = strlen (out)+1;
        n = min (n, buffer_size);
        memcpy (buffer, out, n);
        buffer[buffer_size-1] = 0;
    }
    else {
        *buffer = 0;
    }
    conf_unlock ();
}

float
conf_get_float (const char *key, float def) {
    conf_lock ();
    const char *v = conf_get_str_fast (key, NULL);
    conf_unlock ();
    return v ? atof (v) : def;
}

int
conf_get_int (const char *key, int def) {
    conf_lock ();
    const char *v = conf_get_str_fast (key, NULL);
    conf_unlock ();
    return v ? atoi (v) : def;
}

int64_t
conf_get_int64 (const char *key, int64_t def) {
    conf_lock ();
    const char *v = conf_get_str_fast (key, NULL);
    conf_unlock ();
    return v ? atoll (v) : def;
}

DB_conf_item_t *
conf_find (const char *group, DB_conf_item_t *prev) {
    int l = strlen (group);
    for (DB_conf_item_t *it = prev ? prev->next : conf_items; it; it = it->next) {
        if (!strncasecmp (group, it->key, l)) {
            return it;
        }
    }
    return NULL;
}

void
conf_set_str (const char *key, const char *val) {
    conf_lock ();
    changed = 1;
    DB_conf_item_t *prev = NULL;
    for (DB_conf_item_t *it = conf_items; it; it = it->next) {
        int cmp = strcasecmp (key, it->key);
        if (!cmp) {
            free (it->value);
            it->value = strdup (val);
            conf_unlock ();
            return;
        }
        else if (cmp < 0) {
            break;
        }
        prev = it;
    }
    if (!val) {
        conf_unlock ();
        return;
    }
    DB_conf_item_t *it = malloc (sizeof (DB_conf_item_t));
    memset (it, 0, sizeof (DB_conf_item_t));
    it->key = strdup (key);
    it->value = strdup (val);
    if (prev) {
        DB_conf_item_t *next = prev->next;
        prev->next = it;
        it->next = next;
    }
    else {
        it->next = conf_items;
        conf_items = it;
    }
    conf_unlock ();
}

void
conf_set_int (const char *key, int val) {
    char s[10];
    snprintf (s, sizeof (s), "%d", val);
    conf_set_str (key, s);
}

void
conf_set_int64 (const char *key, int64_t val) {
    char s[20];
    snprintf (s, sizeof (s), PRId64, val);
    conf_set_str (key, s);
}

void
conf_set_float (const char *key, float val) {
    char s[10];
    snprintf (s, sizeof (s), "%0.7f", val);
    conf_set_str (key, s);
}

int
conf_ischanged (void) {
    return changed;
}

void
conf_setchanged (int c) {
    changed = c;
}

void
conf_remove_items (const char *key) {
    int l = strlen (key);
    conf_lock ();
    DB_conf_item_t *prev = NULL;
    DB_conf_item_t *it;
    for (it = conf_items; it; prev = it, it = it->next) {
        if (!strncasecmp (key, it->key, l)) {
            break;
        }
    }
    DB_conf_item_t *next = NULL;
    while (it) {
        next = it->next;
        conf_item_free (it);
        it = next;
        if (!it || strncasecmp (key, it->key, l)) {
            break;
        }
    }
    if (prev) {
        prev->next = next;
    }
    else {
        conf_items = next;
    }
    conf_unlock ();
}