/*************************************************************************
> File Name: Kris_shell.c
> Author: KrisChou
> Mail:zhoujx0219@163.com
> Created Time: Thu 21 Aug 2014 04:31:55 PM CST
************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/wait.h>
#define PROMPT ">>"
#define ARG_CNT 32
void command_to_arglist(char** arglist,char *cmd_line);
int main(int argc, char *argv[])
{
char cmd_line[1024];
char *arglist[ARG_CNT];
while(memset(cmd_line,0,1024), printf("%s",PROMPT), fgets(cmd_line,1024,stdin))
{
if(cmd_line[0] != '\n')
{
cmd_line[strlen(cmd_line) - 1] = '\0'; //将读进来的换行符变成'\0'
command_to_arglist(arglist,cmd_line);
if(fork() > 0)
{
wait(NULL);
}else
{
execvp(arglist[0],arglist);
exit(0);
}
}
}
return 0;
}
static int my_isspace(char c)
{
if(c == ' '|| c == '\n' || c == '\t' || c =='\v')
return 1;
else
return 0;
}
static void command_to_arglist(char** arglist,char *cmd_line)
{
int cnt = 0;
int bg,end;
bg = 0;
while(cmd_line[bg] != '\0')
{
while(my_isspace(cmd_line[bg]))
{
bg++;
}
if(cmd_line[bg] == '\0')
{
break;
}
end = bg;
while(cmd_line[end] != '\0' && !my_isspace(cmd_line[end]))
{
end++;
}
arglist[cnt] = (char*)calloc(1, (end-bg+1));
strncpy(arglist[cnt],cmd_line+bg,(end-bg));
cnt++;
bg = end;
}
arglist[cnt] = NULL;
}