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| /*************************************************************************
> File Name: shell.c
> Author:perrynzhou
> Mail:perrynzhou@gmail.com
> Created Time: Thu 20 Jun 2019 09:15:59 PM CST
************************************************************************/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <glob.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/wait.h>
static const char *delimiter = " \t\n";
typedef struct
{
glob_t gt;
int (*cmd_cd_fn)(char **argv);
int (*cmd_exit_fn)(char **argv);
int (*cmd_help_fn)(char **argv);
} cmd_t;
static void prompt()
{
fprintf(stdout, "zsh-0.1$ ");
}
void parsed_cmd(char *line, cmd_t *cmd)
{
char *token;
int flag = 0;
while (1)
{
token = strsep(&line, delimiter);
if (token == NULL)
{
break;
}
if (*token == '\0')
{
continue;
}
glob(token, GLOB_NOCHECK | GLOB_APPEND * flag, NULL, &cmd->gt);
flag = 1;
}
}
int main(int argc, char *argv[])
{
char *line = NULL;
size_t line_size = 0;
cmd_t cmd;
pid_t pid;
while (1)
{
prompt();
if (getline(&line, &line_size, stdin) < 0)
{
break;
}
parsed_cmd(line, &cmd);
pid = fork();
switch (pid)
{
case -1:
perror("fork()");
exit(1);
case 0:
execvp(cmd.gt.gl_pathv[0], cmd.gt.gl_pathv);
exit(0);
default:
wait(NULL);
}
}
}
|