originalShell.c

/* file name : originalShell.c
 * Author    : 1517914 2EP2-31 Hayati Doi
 * Outline   : Operating System 1 , 2nd Report
 * Copyright (c) 2016, Hayato Doi
 */
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <dirent.h>
#include <time.h>
#include <sys/stat.h>
#define MAXDIRBUF 1024

int getarg(char *argv[], char *buf){
	int i;
	bool flag = false;
	for(i = 0; *buf != '\0';i++){
		while(*buf == ' ' || flag){
			*buf = '\0';
			buf++;
		}
		if(*buf == '\0'){
			break;
		}
		argv[i] = buf;
		while((*buf != '\0' && *buf != ' ') || flag){
			if(*buf == '\"' ){
				*buf = '\0';
				buf++;
				if(!flag){
					argv[i] = buf;
				}
				flag = !flag;
			}
			buf++;
		}
	}
	argv[i] = NULL;
	return i;
}

int main(int argc, char *argv[]){
	char dir[1024];
	char command[512];
	char line[512];
	char *largv[256];
	int largc;
	do{
		//output directory
		sprintf(line, "[%s]%% " ,getcwd(dir,MAXDIRBUF));
		fprintf(stdout, "%s", line);
		//read command
		fgets(command, 511, stdin);
		// skip to scan line.
		if( sscanf(command, "%[^\n]", command ) <= 0 ){
			continue;
		}
		largc = getarg(largv,command);

		// Built-in command
		if(strcmp(largv[0],"CD") == 0){
			// skip to scan line.
			if(largc < 2){
				continue;
			}
			//Change directory
			chdir(largv[1]);
		}
		else if(strcmp(largv[0],"LS") == 0){
			struct dirent **namelist;
			int n;

			if(largc < 2){
				largv[1] = ".";
			}
			n = scandir(largv[1], &namelist, NULL, alphasort);
			while (n--) {
				fprintf(stdout, "%s\n", namelist[n]->d_name);
				free(namelist[n]);
			}
			free(namelist);
		}
		else if(strcmp(largv[0],"STAT") == 0){
			char timestr[26];
			struct stat s0;
			//error
			if( stat(largv[1],&s0) == -1 ){
				continue;
			}
			ctime_r( &(s0.st_atime), timestr);
			fprintf(stdout," 最終アクセス日時        : %s", timestr );
			ctime_r( &(s0.st_mtime), timestr);
			fprintf(stdout," 最終更新日時            : %s", timestr );
			ctime_r( &(s0.st_ctime), timestr);
			fprintf(stdout," 最終ファイル状態変更日時: %s", timestr );
		}
		// Built-out command
		else{
			// make child prosess
			if(fork()==0){
				execvp(largv[0],largv);
				fprintf(stdout, "originalShell: command not found: %s\n",largv[0]);
				exit(1);
			}
			wait(NULL);
		}

	}while(true);
}