rockbox/apps/plugins/lib/highscore.c

/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 * $Id$
 *
 * Copyright (C) 2005 Linus Nielsen Feltzing
 *
 * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/
#include "plugin.h"
#include "highscore.h"

int highscore_save(char *filename, struct highscore *scores, int num_scores)
{
    int i;
    int fd;
    int rc;
    char buf[80];

    fd = rb->open(filename, O_WRONLY|O_CREAT);
    if(fd < 0)
        return -1;
    
    for(i = 0;i < num_scores;i++)
    {
        rb->snprintf(buf, sizeof(buf), "%d:%d:%s\n",
                     scores[i].score, scores[i].level, scores[i].name);
        rc = rb->write(fd, buf, rb->strlen(buf));
        if(rc < 0)
        {
            rb->close(fd);
            return -2;
        }
    }
    rb->close(fd);
    return 0;
}

int highscore_load(char *filename, struct highscore *scores, int num_scores)
{
    int i;
    int fd;
    char buf[80];
    char *score, *level, *name;

    rb->memset(scores, 0, sizeof(struct highscore)*num_scores);

    fd = rb->open(filename, O_RDONLY);
    if(fd < 0)
        return -1;

    i = 0;
    while(rb->read_line(fd, buf, sizeof(buf)) > 0 && i < num_scores)
    {
        DEBUGF("%s\n", buf);

        if ( !rb->settings_parseline(buf, &score, &level) )
            continue;
        if ( !rb->settings_parseline(level, &level, &name) )
            continue;

        scores[i].score = rb->atoi(score);
        scores[i].level = rb->atoi(level);
        rb->strlcpy(scores[i].name, name, sizeof(scores[i].name));
        i++;
    }
    rb->close(fd);
    return 0;
}

int highscore_update(int score, int level, const char *name,
                     struct highscore *scores, int num_scores)
{
    int pos;
    struct highscore *entry;
    
    if (!highscore_would_update(score, scores, num_scores))
        return -1;

    pos = num_scores-1;
    while (pos > 0 && score > scores[pos-1].score)
    {
        /* move down one */
        rb->memcpy((void *)&scores[pos], (void *)&scores[pos-1],
                   sizeof(struct highscore));
        pos--;
    }
    
    entry = scores + pos;
    entry->score = score;
    entry->level = level;
    rb->strlcpy(entry->name, name, sizeof(entry->name));

    return pos;
}

bool highscore_would_update(int score, struct highscore *scores,
                            int num_scores)
{
    return (num_scores > 0) && (score > scores[num_scores-1].score);
}