config.c

SFC游戏模拟器 snes9x 1.43 的原代码

/*******************************************************************************
  Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
 
  (c) Copyright 1996 - 2002 Gary Henderson ([e-mail]) and
                            Jerremy Koot ([e-mail])

  (c) Copyright 2001 - 2004 John Weidman ([e-mail])

  (c) Copyright 2002 - 2004 Brad Jorsch ([e-mail]),
                            funkyass ([e-mail]),
                            Joel Yliluoma (http://iki.fi/bisqwit/)
                            Kris Bleakley ([e-mail]),
                            Matthew Kendora,
                            Nach ([e-mail]),
                            Peter Bortas ([e-mail]) and
                            zones ([e-mail])

  C4 x86 assembler and some C emulation code
  (c) Copyright 2000 - 2003 zsKnight ([e-mail]),
                            _Demo_ ([e-mail]), and Nach

  C4 C++ code
  (c) Copyright 2003 Brad Jorsch

  DSP-1 emulator code
  (c) Copyright 1998 - 2004 Ivar ([e-mail]), _Demo_, Gary Henderson,
                            John Weidman, neviksti ([e-mail]),
                            Kris Bleakley, Andreas Naive

  DSP-2 emulator code
  (c) Copyright 2003 Kris Bleakley, John Weidman, neviksti, Matthew Kendora, and
                     Lord Nightmare ([e-mail]

  OBC1 emulator code
  (c) Copyright 2001 - 2004 zsKnight, pagefault ([e-mail]) and
                            Kris Bleakley
  Ported from x86 assembler to C by sanmaiwashi

  SPC7110 and RTC C++ emulator code
  (c) Copyright 2002 Matthew Kendora with research by
                     zsKnight, John Weidman, and Dark Force

  S-DD1 C emulator code
  (c) Copyright 2003 Brad Jorsch with research by
                     Andreas Naive and John Weidman
 
  S-RTC C emulator code
  (c) Copyright 2001 John Weidman
  
  ST010 C++ emulator code
  (c) Copyright 2003 Feather, Kris Bleakley, John Weidman and Matthew Kendora

  Super FX x86 assembler emulator code 
  (c) Copyright 1998 - 2003 zsKnight, _Demo_, and pagefault 

  Super FX C emulator code 
  (c) Copyright 1997 - 1999 Ivar, Gary Henderson and John Weidman


  SH assembler code partly based on x86 assembler code
  (c) Copyright 2002 - 2004 Marcus Comstedt ([e-mail]) 

 
  Specific ports contains the works of other authors. See headers in
  individual files.
 
  Snes9x homepage: http://www.snes9x.com
 
  Permission to use, copy, modify and distribute Snes9x in both binary and
  source form, for non-commercial purposes, is hereby granted without fee,
  providing that this license information and copyright notice appear with
  all copies and any derived work.
 
  This software is provided 'as-is', without any express or implied
  warranty. In no event shall the authors be held liable for any damages
  arising from the use of this software.
 
  Snes9x is freeware for PERSONAL USE only. Commercial users should
  seek permission of the copyright holders first. Commercial use includes
  charging money for Snes9x or software derived from Snes9x.
 
  The copyright holders request that bug fixes and improvements to the code
  should be forwarded to them so everyone can benefit from the modifications
  in future versions.
 
  Super NES and Super Nintendo Entertainment System are trademarks of
  Nintendo Co., Limited and its subsidiary companies.
*******************************************************************************/
/*         ______   ___    ___ 
 *        /\  _  \ /\_ \  /\_ \ 
 *        \ \ \L\ \\//\ \ \//\ \      __     __   _ __   ___ 
 *         \ \  __ \ \ \ \  \ \ \   /'__`\ /'_ `\/\`'__\/ __`\
 *          \ \ \/\ \ \_\ \_ \_\ \_/\  __//\ \L\ \ \ \//\ \L\ \
 *           \ \_\ \_\/\____\/\____\ \____\ \____ \ \_\\ \____/
 *            \/_/\/_/\/____/\/____/\/____/\/___L\ \/_/ \/___/
 *                                           /\____/
 *                                           \_/__/
 *      By Shawn Hargreaves,
 *      1 Salisbury Road,
 *      Market Drayton,
 *      Shropshire,
 *      England, TF9 1AJ.
 *
 *      Configuration routines.
 *
 *      See readme.txt for copyright information.
 */


#include <stdlib.h>
#include <stdio.h>
#include <strings.h>
#include <ctype.h>
#include <dirent.h>
#include <unistd.h>

#include "snes9x.h"

#ifndef MIN
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#endif

typedef struct CONFIG_ENTRY
{
   char *name;                      /* variable name (NULL if comment) */
   char *data;                      /* variable value */
   struct CONFIG_ENTRY *next;       /* linked list */
} CONFIG_ENTRY;


typedef struct CONFIG
{
   CONFIG_ENTRY *head;              /* linked list of config entries */
   char *filename;                  /* where were we loaded from? */
   int dirty;                       /* has our data changed? */
} CONFIG;


#define MAX_CONFIGS     4

static CONFIG *config[MAX_CONFIGS] = { NULL, NULL, NULL, NULL };
static CONFIG *config_override = NULL;

/* static int config_installed = FALSE; */ /* Dead code */

char *get_filename(char *path)
{
    int pos;
   
    for (pos=0; path[pos]; pos++)
        ; /* do nothing */
	    
    while ((pos>0) && (path[pos-1] != '\\') && (path[pos-1] != '/'))
	pos--;
    return path+pos;
}

long file_size (char *filename)
{
    FILE *fs = fopen (filename, "r");

    if (fs)
    {
	long len;
	
	fseek (fs, 0, SEEK_END);
	len = ftell (fs);
	fclose (fs);

	return (len);
    }
    return (0);
}

/* destroy_config:
 *  Destroys a config structure, writing it out to disk if the contents
 *  have changed.
 */
static void destroy_config(CONFIG *cfg)
{
   CONFIG_ENTRY *pos, *prev;

   if (cfg) {
      if (cfg->filename) {
	 if (cfg->dirty) {
	    /* write changed data to disk */
	    FILE *f = fopen(cfg->filename, "w");

	    if (f) {
	       pos = cfg->head;

	       while (pos) {
		  if (pos->name) {
		     fputs(pos->name, f);
		     if (pos->name[0] != '[')
			fputs(" = ", f);
		  }
		  if (pos->data)
		     fputs(pos->data, f);

		  fputs("\n", f);
		  pos = pos->next;
	       }

	       fclose(f);
	    }
	 }

	 free(cfg->filename);
      }

      /* destroy the variable list */
      pos = cfg->head;

      while (pos) {
	 prev = pos;
	 pos = pos->next;

	 if (prev->name)
	    free(prev->name);

	 if (prev->data)
	    free(prev->data);

	 free(prev);
      }

      free(cfg);
   }
}



#if 0 /* Dead code */
/* config_cleanup:
 *  Called at shutdown time to free memory being used by the config routines,
 *  and write any changed data out to disk.
 */
static void config_cleanup()
{
   int i;

   for (i=0; i<MAX_CONFIGS; i++) {
      if (config[i]) {
	 destroy_config(config[i]);
	 config[i] = NULL;
      }
   }

   if (config_override) {
      destroy_config(config_override);
      config_override = NULL;
   }

/*   _remove_exit_func(config_cleanup);*/
   config_installed = FALSE;
}
#endif /* Dead code */

/* init_config:
 *  Sets up the configuration routines ready for use, also loading the
 *  default config file if the loaddata flag is set and no other config
 *  file is in memory.
 */
static void init_config(int loaddata)
{
#if 0
   char buf[4][1025];
   char *s;
   int i;

   if (!config_installed) {
/*      _add_exit_func(config_cleanup);*/
      config_installed = TRUE;
   }

   if ((loaddata) && (!config[0])) {
      /* look for allegro.cfg in the same directory as the program */
      strcpy(buf[0], __crt0_argv[0]);
      strlwr(buf[0]);
      *get_filename(buf[0]) = 0;
      put_backslash(buf[0]);
      strcat(buf[0], "allegro.cfg");

      /* if that fails, try sound.cfg */
      strcpy(buf[1], __crt0_argv[0]);
      strlwr(buf[1]);
      *get_filename(buf[1]) = 0;
      put_backslash(buf[1]);
      strcat(buf[1], "sound.cfg");

      /* no luck? try the ALLEGRO enviroment variable... */
      s = getenv("ALLEGRO");
      if (s) {
	 strcpy(buf[2], s);
	 strlwr(buf[2]);
	 put_backslash(buf[2]);
	 strcat(buf[2], "allegro.cfg");

	 strcpy(buf[3], s);
	 strlwr(buf[3]);
	 put_backslash(buf[3]);
	 strcat(buf[3], "sound.cfg");
      }
      else {
	 strcpy(buf[2], buf[0]);
	 strcpy(buf[3], buf[1]);
      }
      /* see which of these files actually exist */
      for (i=0; i<4; i++) {
	 if (access (buf[i], R_OK)) {
	    set_config_file(buf[i]);
	    break;
	 }
      }

      if (i >= 4)
	 set_config_file(buf[0]);
   }
#endif   
}

/* get_line: 
 *  Helper for splitting files up into individual lines.
 */
static int get_line(char *data, int length, char *name, char *val)
{
   char buf[256], buf2[256];
   int pos, i, j;

   for (pos=0; (pos<length) && (pos<255); pos++) {
      if ((data[pos] == '\r') || (data[pos] == '\n')) {
	 buf[pos] = 0;
	 if ((pos < length-1) && 
	     (((data[pos] == '\r') && (data[pos+1] == '\n')) ||
	      ((data[pos] == '\n') && (data[pos+1] == '\r')))) {
	    pos++;
	 }
	 pos++;
	 break;
      }

      buf[pos] = data[pos];
   }

   buf[MIN(pos,255)] = 0;

   /* skip leading spaces */
   i = 0;
   while ((buf[i]) && (isspace((int)buf[i])))
      i++;

   /* read name string */
   j = 0;
   while ((buf[i]) && (!isspace((int)buf[i])) && (buf[i] != '=') && (buf[i] != '#'))
      buf2[j++] = buf[i++];

   if (j) {
      /* got a variable */
      buf2[j] = 0;
      strcpy(name, buf2);

      while ((buf[i]) && ((isspace((int)buf[i])) || (buf[i] == '=')))
	 i++;

      strcpy(val, buf+i);

      /* strip trailing spaces */
      i = strlen(val) - 1;
      while ((i >= 0) && (isspace((int)val[i])))
	 val[i--] = 0;
   }
   else {
      /* blank line or comment */
      name[0] = 0;
      strcpy(val, buf);
   }

   return pos;
}



/* set_config:
 *  Does the work of setting up a config structure.
 */
static void set_config(CONFIG **config, char *data, int length, char *filename)
{
   char name[256];
   char val[256];
   CONFIG_ENTRY **prev, *p;
   int pos;

   init_config(FALSE);

   if (*config) {
      destroy_config(*config);
      *config = NULL;
   }

   *config = (CONFIG *) malloc(sizeof(CONFIG));
   (*config)->head = NULL;
   (*config)->dirty = FALSE;

   if (filename) {
      (*config)->filename = (char *) malloc(strlen(filename)+1);
      strcpy((*config)->filename, filename); 
   }
   else
      (*config)->filename = NULL;

   prev = &(*config)->head;
   pos = 0;

   while (pos < length) {
      pos += get_line(data+pos, length-pos, name, val);

      p = (CONFIG_ENTRY *) malloc(sizeof(CONFIG_ENTRY));

      if (name[0]) {
	 p->name = (char *) malloc(strlen(name)+1);
	 strcpy(p->name, name);
      }
      else
	 p->name = NULL;

      p->data = (char *) malloc(strlen(val)+1);
      strcpy(p->data, val);

      p->next = NULL;
      *prev = p;
      prev = &p->next;
   }
}



/* load_config_file: