void save_into_file(){
	
	STRING* read_str = ""; STRING* write_str = ""; 
	STRING* before_str = ""; STRING* after_str = "";
	
	var fhandle = file_open_read("map.dat");
	if(fhandle == NULL){ error("File wasn't found!"); return; }
	
	var len_var = file_length(fhandle);	
	file_str_readto(fhandle, read_str, ";", len_var);	
	file_close(fhandle);
	
	// BEFORE string:
	var start_var = str_stri(read_str, "[ROOM 2]");
	str_cut(before_str, read_str, 0, start_var + 7);
	
	// AFTER string:
	var end_var = str_stri(read_str, "[ROOM 3]");
	str_cut(after_str, read_str, end_var, len_var);
	
	// get the part of the string, where we need to change stuff:
	str_cut(write_str, read_str, start_var + 8, end_var - 1);
	str_cpy(write_str, "THIS IS NOT THE SECOND ROOM!");
	
	// add empty space:
	str_cat(before_str, " ");
	// use that empty space to move pointer to the next line:
	str_setchr(before_str, str_len(before_str), 10);
	
	// add empty space to the stuff we've changed:
	str_cat(write_str, " ");
	// add changes to BEFORE string:
	str_cat(before_str, write_str);
	// use empty space at the end to move pointer to the next line:
	str_setchr(before_str, str_len(before_str), 10);
	// add AFTER str (so the whole string is complete now)
	str_cat(before_str, after_str);
	
	// write this all into the file:
	var fhandle = file_open_write("map.dat");
	file_str_write(fhandle, before_str);
	file_close(fhandle);
}

while (loop through every txt line of your save file) {
  1) get the current line and convert it to a lite-c string
  
  2) use the str_parse functions to get the value of that line

  3) use str_cmpni's to compare it content/description in some big nested if's to determine what to do with the value
}

#include <acknex.h>

#define LEVEL_COUNT        20
#define OBJECTS_MAX        10

FONT *fntArial = "Arial#20";

typedef struct OBJECT
{
	var x;
	var y;
	var z;
	var pan;
	var tilt;
	var roll;
	// and so...
} OBJECT;

OBJECT objects[LEVEL_COUNT][OBJECTS_MAX];

void objects_save ()
{
	file_save ( "saved.dat", objects, sizeof(OBJECT) * LEVEL_COUNT * OBJECTS_MAX );
}

void objects_load ()
{
	if ( !file_exists ( "saved.dat" ) )
		return;
	long size = 0;
	void *buffer = file_load ( "saved.dat", NULL, &size );
	memcpy ( objects, buffer, sizeof(OBJECT) * LEVEL_COUNT * OBJECTS_MAX );
	file_load ( NULL, buffer, &size );
}

void objects_zero ()
{
	memset ( objects, 0, sizeof(OBJECT) * LEVEL_COUNT * OBJECTS_MAX );
}

void evnPan ()
{
	var indexX = floor ( LEVEL_COUNT * mouse_pos.x / screen_size.x );
	var indexY = floor ( OBJECTS_MAX * mouse_pos.y / screen_size.y );
	if ( event_type == EVENT_CLICK )
		objects[indexX][indexY].x += 1;
	else if ( event_type == EVENT_RIGHTCLICK )
		objects[indexX][indexY].x -= 1;
}

void main ()
{
	video_mode = 10;
	mouse_mode = 4;
	enable_mouse = 2;
	wait(1);
	
	PANEL *pan = pan_create ( "", 1 );
	pan->size_x = screen_size.x;
	pan->size_y = screen_size.y;
	var stepX = pan->size_x / LEVEL_COUNT;
	var stepY = pan->size_y / OBJECTS_MAX;
	var y = 0;
	for ( ; y<OBJECTS_MAX; y+=1 )
	{
		var x = 0;
		for ( ; x<LEVEL_COUNT; x+=1 )
		{
			pan_setdigits ( pan, 0, (stepX/2)+x*stepX, (stepY/2)+y*stepY, "%.0f", fntArial, 1, &objects[x][y].x );
		}
	}
	pan->event = evnPan;
	pan->flags |= SHOW;
	
	on_s = objects_save;
	on_l = objects_load;
	on_r = objects_zero;
	
	while ( !key_esc )
		wait (1);
	
	pan_remove ( pan );
	sys_exit ( NULL );
}