#include <stdio.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <string.h>
char **parse_cmdline( const char *cmdlin );
int main(int argc,char **argv){
    int check_for_ending = 0;
    char string[2];
    string[0] = '$';
    string[1] = ' ';

    char new_line[1];
    new_line[0] = '\n';

	while(1){

	    write(1,string,2);
	    //printf("$ ");
	    int t=1,i=0;
	    char buffer[1];
	    char *suffer = malloc(t*sizeof(char));
	    //int size=0;

	   /* int vladi = getline(&suffer,&size,stdin);
	    if( feof(stdin) ) {
         break;
        }
	    suffer[vladi-1]='\0';
	    */
	    while(1){
	        int g = read(STDIN_FILENO,buffer,1);
	        if(g==0){
	            check_for_ending = 1;
	            break;
	        }
	        if(buffer[0]=='\n'){
	        suffer[i] = '\0';
	        break;
	        }
	        suffer[i] = buffer[0];
	        i++;
	        if(i==t)
	        {
	            t=t+1;
	            suffer = realloc(suffer,t*sizeof(char));
	        }
	    }
	    if(check_for_ending){
	        //write(STDIN_FILENO,new_line,1);
	        break;
	    }
	    char **masivche = parse_cmdline(suffer);
	    /*char *pointer = masivche[0];
	    char *pointer1 = masivche[1];
	    char *pointer2 = masivche[2];
	    char *pointer3 = masivche[3];
	    write(STDIN_FILENO,pointer,strlen(masivche[0]));
	    write(STDIN_FILENO,pointer1,strlen(masivche[1]));
	    write(STDIN_FILENO,pointer2,strlen(masivche[2]));
	    return 0;*/
	    char *pointer = masivche[0];
	    if(pointer==NULL){continue;}
        pid_t pid = fork();
        if(pid < 0){
        perror("fork");
        continue;
        }
        if(pid == 0){
	        int p = execv(masivche[0],masivche);
        	if(p < 0){
		        perror(masivche[0]);
		        exit(0);
	        }
	        exit(0);
        }else{
	        waitpid(pid, 0 ,0);
        }
        free(masivche[0]);
        free(masivche);
	}
return 0;
}
char **parse_cmdline( const char *cmdlin ){
       char *string = malloc(strlen(cmdlin)*sizeof(char));
       strcpy(string,cmdlin);
       int op=0;
       char **array_of_commands = NULL;
       char *token = strtok(string, " ");
       while(token != NULL )
       {
        op++;
        array_of_commands = realloc(array_of_commands,(op+1)*sizeof(char*));
        array_of_commands[op-1] = token;
        token = strtok(NULL, " ");
       }
       array_of_commands[op]=NULL;
       return array_of_commands;


    /*int i=2,j,y=0,help=0,k=2,array_counter=0;
    char **array_of_commands = malloc(k*sizeof(char*));
    char *command = malloc(i*sizeof(char*));
    for(j=0;;j++){
    if(cmdlin[j]!=' '){break;}
    }
    for(;;j++){
        if(cmdlin[j]=='\0'){break;}
    	while(cmdlin[j]!=' '){
        	command[y] = cmdlin[j];
	        j++;y++;
	        if(y == i){
	            i*=2;
	            command = realloc(command,i*sizeof(char));
	        }
	        help=1;
    	}
    	if(help == 1){
    	    command[y]='\0';
    	    y=0;
    	    array_of_commands[array_counter] = command;
    	    array_counter++;
    	    if(array_counter + 1 == k){
	            k*=2;
	            array_of_commands = realloc(array_of_commands,k*sizeof(char*));
	        }
    	}
    	help = 0;
    }*/
}