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shell.c
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shell.c
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#include<stdlib.h>
#include<stdio.h>
#include<unistd.h>
#include<sys/wait.h>
#include<string.h>
#include<ctype.h>
#define IN 1
#define OUT 0
void do_exec(int argc, char* argv[])
{
pid_t id;
if( (id=fork()) == 0)
{
execvp(argv[0],argv);
printf("command %s not found\n",argv[0]);
exit(1);
}
int s;
waitpid(id, &s, 0);
}
void do_prase(char *buf)
{
char* argv[8];
int argc = 0;
int flag = OUT;
int i = 0;
for(i = 0; buf[i] !='\0'; i++)
{
if(!isspace(buf[i]) && flag == OUT){
flag = IN;
argv[argc++] = &buf[i];
}else if(isspace(buf[i])){
flag = OUT;
buf[i] = '\0';
}
}
argv[argc] = NULL;
do_exec(argc, argv);
}
int main()
{
char buf[100];
while(1)
{
printf("冰可乐>");
memset(buf, 0x00, sizeof(buf));
scanf("%[^\n]%*c",buf);
if( strncmp(buf, "exit", 4) == 0)
exit(0);
do_prase(buf);
}
return 0;
}