fsm_code_gen.c

#include<stdio.h>
#include<stdlib.h>

/* This is a simple FSM Generator */

/* Note :
 This program can be executed as part of Make file or separately
 when you compile and run the required .c and .h are generated automatically 
 fsm.txt is the input file to this script 
 
 Just fill the action routines , you are good to go.
 
 This script generates two files as output
 1) auto_gen_fsm.h
 2) auto_gen_fsm.c"
*/

/*constant definitions*/
#define NL	"\n"
#define OPEN_BRCKT       "{"
#define OPEN_BRCKT_NL    "{\n"
#define CLOSE_BRCKT      "}"
#define CLOSE_BRCKT_NL   "}\n"
#define SEMI_COLON   ";"
#define TYPEDEF    "typedef enum"
#define ENUM_EVENT  "gen_event_t"
#define ENUM_STATE  "gen_state_t"

#define EVENT_PFX "FSM_EVENT" 
#define STATE_PFX "FSM__STATE" 

FILE *IN = NULL ;
FILE *OUTFILE_SRC = NULL;
FILE *OUTFILE_HDR = NULL;

void open_files()
{
    IN= fopen("fsm.txt", "w");
    OUTFILE_SRC = fopen("auto_gen_fsm.h", "w");
    OUTFILE_HDR = fopen("auto_gen_fsm.c", "w");
    return;
}


void print_events_enum() 
{
    fprintf( OUTFILE_HDR, NL);
    fprintf( OUTFILE_HDR, NL);
    fprintf( OUTFILE_HDR, "/* These are the enums for events of the FSM */\n");
    fprintf( OUTFILE_HDR, TYPEDEF);
    fprintf( OUTFILE_HDR, NL);
    fprintf( OUTFILE_HDR, OPEN_BRCKT_NL);
    fprintf( OUTFILE_HDR, "\t$tmp\n");
    fprintf( OUTFILE_HDR, "\t$tmp\n");
    fprintf( OUTFILE_HDR, CLOSE_BRCKT);
    fprintf( OUTFILE_HDR, ENUM_EVENT);
    fprintf( OUTFILE_HDR, SEMI_COLON);
    fprintf( OUTFILE_HDR, NL);
}

void print_events() 
{
    fprintf( OUTFILE_SRC, NL);
    fprintf( OUTFILE_SRC, NL);
    fprintf( OUTFILE_SRC, "/* These are the events of the FSM */\n");
    fprintf( OUTFILE_SRC, "/* This enum should match the event enums */\n");
    fprintf( OUTFILE_SRC, " char* gen_fsm_event_string[]= \n");
    fprintf( OUTFILE_SRC, OPEN_BRCKT_NL);
	fprintf( OUTFILE_SRC, "\t\"MAX_EVENT\"\n");
	fprintf( OUTFILE_SRC, CLOSE_BRCKT);
	fprintf( OUTFILE_SRC, SEMI_COLON);
	fprintf( OUTFILE_SRC, NL);
}

void print_states_enum() 
{
	fprintf( OUTFILE_HDR, NL);
	fprintf( OUTFILE_HDR, NL);
	fprintf( OUTFILE_HDR, "/* These are the enums for states of the FSM */\n");
	fprintf( OUTFILE_HDR, TYPEDEF);
	fprintf( OUTFILE_HDR, NL);
	fprintf( OUTFILE_HDR, OPEN_BRCKT_NL);
	fprintf( OUTFILE_HDR, "\t$tmp\n");
	fprintf( OUTFILE_HDR, CLOSE_BRCKT);
	fprintf( OUTFILE_HDR, ENUM_STATE);
	fprintf( OUTFILE_HDR, SEMI_COLON);
	fprintf( OUTFILE_HDR, NL);
}


void print_states() 
{
	fprintf( OUTFILE_SRC, NL);
	fprintf( OUTFILE_SRC, NL);
	fprintf( OUTFILE_SRC, "/* These are the states of the FSM */\n");
	fprintf( OUTFILE_SRC, "/* This enum should match the state enums */\n");
	fprintf( OUTFILE_SRC, "char* gen_fsm_state_string[] = \n" );
	fprintf( OUTFILE_SRC, OPEN_BRCKT_NL);
    {
		fprintf( OUTFILE_SRC, "\t\"$k\",\n");
	}
	fprintf( OUTFILE_SRC, "\t\"MAX_STATE\"\n");
	fprintf( OUTFILE_SRC, CLOSE_BRCKT);
	fprintf( OUTFILE_SRC, SEMI_COLON);
	fprintf( OUTFILE_SRC, NL);
}


void print_state_table() 
{
	fprintf( OUTFILE_SRC, NL);
	fprintf( OUTFILE_SRC, NL);
	fprintf( OUTFILE_SRC, "/* This is the init function of the fsm*/\n");
	fprintf( OUTFILE_SRC, "void gen_fsm_register_handles()\n");
	fprintf( OUTFILE_SRC, OPEN_BRCKT_NL);
    {
      fprintf( OUTFILE_SRC,  "\t$k\n");
      fprintf( OUTFILE_SRC, NL);
	}
	fprintf( OUTFILE_SRC, CLOSE_BRCKT_NL);
}


void print_comments() 
{
}

void print_header_file() 
{
    fprintf( OUTFILE_HDR,  "#ifndef _AUTO_GEN_FSM_\n");
    fprintf( OUTFILE_HDR,   "#define _AUTO_GEN_FSM_\n");
    fprintf( OUTFILE_HDR,   "\n");
    fprintf( OUTFILE_HDR,   "\n");
    fprintf( OUTFILE_HDR,   "/***** Auto generated C file  ********************/\n");
    /*fprintf( OUTFILE_HDR,   "***** Generated at $time  ****\n");*/
    fprintf( OUTFILE_HDR,   "/***** DO NOT EDIT THIS FILE EVER MANUALLY *******/\n");
}

void close_header_file() 
{
	fprintf( OUTFILE_HDR,   "#endif");
	close (OUTFILE_HDR);
}

void close_src_file() 
{
	close (OUTFILE_SRC);
}

/*generate files*/
void generate_header_file() 
{
    print_header_file();
    fprintf( OUTFILE_HDR, "void gen_fsm_register_handles(void);\n");
    /*print_states_enum();*/
    print_events_enum();
    close_header_file();
}

void generate_source_file() 
{
	fprintf(OUTFILE_SRC, "#include \"auto_gen_fsm.h\"\n");
	fprintf(OUTFILE_SRC, "#include  \"gen_fsm.h\"\n");
	fprintf(OUTFILE_SRC, "#include  \"gen_proto.h\"\n");
	fprintf(OUTFILE_SRC, "\n");
	fprintf(OUTFILE_SRC, "\n");
	print_comments();
	/*print_states(); */
	print_events();
	print_state_table();
	close_src_file();
}


void parse_file() 
{

     /* TODO */

}


/*main function*/
int main()
{
    open_files();
    parse_file();
    /*print file headers*/
    generate_header_file();
    generate_source_file();
    print_state_table();
    close_src_file();
    printf( "FSM generation completed ! \n\n");
}