myshell

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

void FenliCanshu(int *argc,char argv[100][256], char *arg[100]);//分离参数

void Exec_cmd(char *arg[100]);//执行命令


void FenliCanshu(int *argc,char argv[100][256], char *arg[100])
{
    char commod[256], ch;
    int i;
    int j,k;
    j = 0;
    k = 0;
    memset(commod, '\0', 256);
    while(1)
    {
        printf("myshell$$ ");
        while((ch = getchar()) != '\n'){
                commod[strlen(commod)] = ch;
        }
        if(commod[0] == '\0')
            continue;
        if(commod[0] == ' ' ){
            printf("The commmod is Error!\n");
            memset(commod, '\0', 256);
            continue;
        }
        if(commod[strlen(commod) - 1] == ' '){
            commod[strlen(commod) - 1] = '\0';
        }
        for(i = 0; commod[i] != '\0'; i++){
            argv[j][k++] = commod[i];
            if(commod[i] == ' '){
                argv[j][strlen(argv[j]) - 1] = '\0';
                j++;
                k = 0;
            }
        }
        *argc = j + 1;
        for(j = 0; j < *argc; j++)
        {
            arg[j] = (char *)argv[j];
        }
        arg[*argc] = NULL;

        if(strcmp(commod, "exit") == 0)
                    exit(0);
            if(strlen(commod) > 256){
                    printf("The commod is Error!\n");
                    memset(commod, '\0', 256);
                    continue;
            }
        Exec_cmd(arg);
        memset(commod, '\0', 256);
        j = 0;
        k = 0;
        for(i = 0; i < 100; i++)
            memset(argv[i], '\0', 256);
        for(i = 0; i < 100; i++)
            arg[j] = (char *)argv[j];
        }
}
void Exec_cmd(char *arg[100])
{
        pid_t pid;
        pid = fork();
        if(pid == 0){
            if(execvp(arg[0], arg) == -1)
            {
                printf("Failed!\n");
                exit(0);
            }
        }
        else if(pid > 0){
            wait(NULL);
        }
}

int main()
{
    int argc;
    char *arg[100];
    char argv[100][256];
    FenliCanshu(&argc, argv, arg);
        return 0;
}