Linux基础6--MyShell

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


void do_shell(int argc,char *argv[])
{
        pid_t pid = fork();
        if(pid == 0){
                if(execvp(argv[0],argv) == -1)
                        {
                                perror("execvp");
                                exit(1);
                        }
                }else
                        wait(NULL);
}

void do_parse(char *buf)

{
        int argc = 0;
        char *argv[8];
        int i;
        int status = 0;
        for(i=0;buf[i]!=0;i++){
                if(!isspace(buf[i]) && status ==0){
                        argv[argc++] = &buf[i];
                        status =1;
                }else if(isspace(buf[i])){
                        status = 0;
                        buf[i] = 0;
                }
        }
        argv[argc] = NULL;
        do_shell(argc,argv);
}


int main()
{
        char buf[1024] = {};
 while(1){
        memset(buf,0x00,sizeof(buf));


        printf("TSL_shell:");
        scanf("%[^\n]%*c",buf);
        if(strncmp(buf,"exit",4) == 0)
                exit(0);
        do_parse(buf);
        }
}