fceux/drivers/common/config.cpp

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/* FCE Ultra - NES/Famicom Emulator
*
* Copyright notice for this file:
* Copyright (C) 2002 Xodnizel
*
* 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/****************************************************************/
/* FCE Ultra */
/* */
/* This file contains routines for reading/writing the */
/* configuration file. */
/* */
/****************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../../types.h"
#include "config.h"
static int FReadString(FILE *fp, char *str, int n)
{
int x=0,z;
for(;;)
{
z=fgetc(fp);
str[x]=z;
x++;
if(z<=0) break;
if(x>=n) return 0;
}
if(z<0) return 0;
return 1;
}
static void GetValueR(FILE *fp, char *str, void *v, int c)
{
char buf[256];
int s;
while(FReadString(fp,buf,256))
{
fread(&s,1,4,fp);
if(!strcmp(str, buf))
{
if(!c) // String, allocate some memory.
{
if(!(*(char **)v=(char*)malloc(s)))
goto gogl;
fread(*(char **)v,1,s,fp);
continue;
}
else if(s>c || s<c)
{
gogl:
fseek(fp,s,SEEK_CUR);
continue;
}
fread((uint8*)v,1,c,fp);
}
else
fseek(fp,s,SEEK_CUR);
}
fseek(fp,4,SEEK_SET);
}
static void SetValueR(FILE *fp, char *str, void *v, int c)
{
fwrite(str,1,strlen(str)+1,fp);
fwrite((uint8*)&c,1,4,fp);
fwrite((uint8*)v,1,c,fp);
}
static void SaveParse(CFGSTRUCT *cfgst, FILE *fp)
{
int x=0;
while(cfgst[x].ptr)
{
if(!cfgst[x].name) // Link to new config structure
{
SaveParse((CFGSTRUCT*)cfgst[x].ptr,fp); // Recursion is sexy. I could
// save a little stack space if I made
// the file pointer a non-local
// variable...
x++;
continue;
}
if(cfgst[x].len) // Plain data
SetValueR(fp,cfgst[x].name,cfgst[x].ptr,cfgst[x].len);
else // String
if(*(char **)cfgst[x].ptr) // Only save it if there IS a string.
SetValueR(fp,cfgst[x].name,*(char **)cfgst[x].ptr,
strlen(*(char **)cfgst[x].ptr)+1);
x++;
}
}
void SaveFCEUConfig(char *filename, CFGSTRUCT *cfgst)
{
FILE *fp;
fp=fopen(filename,"wb");
if(fp==NULL) return;
SaveParse(cfgst,fp);
fclose(fp);
}
static void LoadParse(CFGSTRUCT *cfgst, FILE *fp)
{
int x=0;
while(cfgst[x].ptr)
{
if(!cfgst[x].name) // Link to new config structure
{
LoadParse((CFGSTRUCT*)cfgst[x].ptr,fp);
x++;
continue;
}
GetValueR(fp,cfgst[x].name,cfgst[x].ptr,cfgst[x].len);
x++;
}
}
void LoadFCEUConfig(char *filename, CFGSTRUCT *cfgst)
{
FILE *fp;
fp=fopen(filename,"rb");
if(fp==NULL) return;
LoadParse(cfgst,fp);
fclose(fp);
}