#include <stdio.h>
#include <stdint.h>
#include <string.h>


void hello()
{
    puts(
        "Welcome to FoolShell v0.1"
    );
}

void prompt() 
{
    printf(
        "$ "
    );
}

int main(int argc, char **argv) 
{

//  hello();

    char *buf=malloc(256);

    while(1)
    {
	prompt();
        fgets(buf,255,stdin);
	buf[strlen(buf)-1]=0; // remove \n
	process(buf);
    }

    return 0;
}

char **tokenize(char *buf)
{

    char **token;
    token=malloc(10*sizeof(char*));

    int l=strlen(buf);

    int i;
    int c=0;

    for(i=0;i<l;i++)
    {  
	// init space for next token
	token[c]=malloc(256);

	//skip all the whitespace
	while(buf[i]==' '&&i<l)i++;
	if(i==l)break;

	//get token
	int t=0;

	while(buf[i]!=' '&&i<l)
	{
	    token[c][t]=buf[i];
	    t++;
	    i++;
	}
	token[c][t]=0;
	


//	printf("token %i : <%s>\n",c, token[c]);
	c++;
	token[c]=NULL;

    }

    return token;

}

int process(char *buf)
{
    
    char **token=tokenize(buf);
    char *command=token[0];
  //  puts(command);
    // copied from trottelshell

    if(!strcmp(command,"help"))
    {
	puts("foolshell: supported built-in commands: 'help', 'echo [string]', exec [inode_nr],'malloc [bytes]', 'free [address]', 'getenv [var]', 'putenv [var] [val]'");
    }
    else if(!strcmp(command,"exec"))
    {
	execve(atoi(token[1]),token,0);

    }
    else if(!strcmp(command,"echo"))
    {
	printf("\"%s\"\n",token[1]);

    }
    else if(!strcmp(command,"malloc"))
    {
	uint8_t *mall=malloc(atoi(token[1]));
	printf("allocated %d bytes at 0x%08X (%i).\n",atoi(token[1]),mall,mall);
    }
    else if(!strcmp(command,"free"))
    {
	free(atoi(token[1]));
	printf("called free(0x%08X).\n",atoi(token[1]));
    }
    else if(!strcmp(command,"getenv"))
    {
	printf("%s = %s \n",token[1],getenv(token[1]));
    }
    else if(!strcmp(command,"putenv"))
    {
	char buf[256];
	sprintf(buf,"%s=%s",token[1],token[2]);
	putenv(buf);
	printf("set: %s = %s \n",token[1],getenv(token[1]));
    }
    else
    {
	puts("foolshell: command not found");
    }

}