#include <stdio.h>
#include <unistd.h>
#include <sys/wait.h>
#include <stdlib.h>
#include <string.h>

char **parse_cmdline( const char *cmdlin );

int main(){

	while(1){

	    write(1,"$ ",2);
	    ssize_t size=0;
	    char *input;
	    getline(&input,&size,stdin);
	    if(feof(stdin))break;
	    char **array = parse_cmdline(input);
	    free(input);
	    //char *pointer = array[0];
        //if(pointer==NULL){continue;}
        pid_t pid = fork();
        if(pid < 0){
            perror("fork");
            free(array[0]);
            free(array);
            continue;
        }
        if(pid == 0){
            int p = execv(array[0],array);
        	if(p < 0){
	            perror(array[0]);
	            free(array[0]);
                free(array);
	            exit(0);
            }
            exit(0);
        }else{
            waitpid(pid, 0 ,0);
        }
        free(array[0]);
        free(array);
	}
return 0;
}
char **parse_cmdline( const char *cmdlin ){
    int str_sym=0, last_sym=0, word=0, current_symbol, word_symbol;
    char *str = malloc(strlen(cmdlin) * sizeof(char));
    strcpy(str,cmdlin);
    char **new_str=malloc((word+1)*sizeof(char*));

    for(;str_sym<strlen(str);str_sym++)
    {
        if(str[str_sym]==' ' || str[str_sym]=='\n')
        {
            if(last_sym!=0) last_sym++;
            new_str[word] = malloc((str_sym - last_sym)*sizeof(char));
            for(current_symbol=last_sym,word_symbol=0;current_symbol<str_sym;current_symbol++,word_symbol++)
            {
                new_str[word][word_symbol]=str[current_symbol];
            }

            last_sym=str_sym;
            word++;
            new_str= realloc(new_str,(word+1)*sizeof(char*));
        }
    }
    return new_str;
}