main.c

一个实现基本功能的shell命令解释器

/*********************************************************/
//Company: SunPlus APP CO.LTD
//Author : Moxudong
//Func   : main.c
//Verison: V1.0
/*********************************************************/

/*********************************************************/
//Founction file name: main.c myfun.h mysh.h
//Args: void
//Return: none
//Author: Moxudong
//Verison: V1.0
/*********************************************************/
#include "myfun.h"
pid_t pid = 1;
int status;

int main(void)
{
//	pid_t pid = 1;
//	signal(SIGTSTP, ctrl_z);
//	signal(SIGCHLD, sig_child);
	int wt, sig, num[1];
	num[0] = 0;
	char  buff[MAX/4] = "\0"
		 ,first[MAX/4] = "\0"
		 ,temp[MAX/8] = "\0"
	     ,*argv[5]
		 ,cmd_histry[50][50]
		 ,*path_rec[10] /*store all path var in pointer[]*/
		 ,path[MAX/8] = "\0";
	char app;
	strcpy(path, getenv("PATH"));
	
	if(is_founded() < 0)/* make my_profile file, and create the PATH env */
	{
		printf("My_profile not found! Creat it now!\n");
		init_enveriment(path, path_rec);
	}
	else
	{
		read_enveriment(path, path_rec);/*this func cut PATH to *path_rec[]*/
	}
	
	while(1)/* main loop */
	{
		if(pid == 0) /* child ID */
		{	
			execv(temp, argv);
			printf("No such command: %s\n", argv[0]);
			exit(ERROR_EXIT);
		}/* child ID */
		else if(pid > 0)/* parent ID */
		{
			p_info();/* print [user@ root]# */
			if((app = getch()) < 0)
			{
				strcpy(buff, histry_cmd(cmd_histry, &app, num, path_rec));
			}
			else
			{
				printf("%c", app);
				first[0] = app;
				first[1] = '\0';
				fgets(buff, MAX/8, stdin);
				buff[strlen(buff)-1] = '\0';
				strcat(first, buff);
				strcpy(buff, first);
				add_histry(buff, cmd_histry, num);
			}
			if(strncmp(buff, "cd", 2) == 0)
			{
				cmd_cut(buff, argv);
				if(chdir(argv[1]) < 0)
					printf("No such dir: %s\n", argv[1]);
				continue;
			}
			else if(strncmp(buff, "exit", 4) == 0)
			{
				printf("Bye bye !\n");
				exit(NORMAL_EXIT);
			}
			else if(strchr(buff, '|') != NULL)
			{
				my_pipe(buff, path_rec);/* pipe function */
				continue;
			}
			else if(strchr(buff, '>') != NULL)
			{
				redirect(buff);/* redirect function */
				continue;
			}
			else if(strchr(buff, '&') != NULL)
			{
				background(buff, path_rec);
				continue;
			}
			else if(strncmp(buff, "./", 2) == 0 || strncmp(buff, "fg", 2) == 0
												|| strncmp(buff, "bg", 2) == 0)
			{
				jobs(buff);
				continue;
			}
			else if(strcmp(buff, "jobs") == 0)
			{
				show_job();
				continue;
			}
			else
			{
				if((sig = cmd_cut(buff, argv)) < 0)
				{
					continue;
				}
				if(bin_founded(temp, path_rec, argv[0]) == -1)/* find the input cmd */
				{
					printf("Command not found!\n");
					continue;
				}
				if((pid = fork()) < 0)
				{
					perror("fork()");
					continue;
				}
				wait(&wt);
			}
		}/* parent ID */
	}/* main loop (while) */
	return 0;
}/* main */