www.pudn.com > SimpleShell.zip > utility.c
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include "myshell.h"
void interDirectory(void);
void interPause(void);
void interEnvi(void);
void interEcho(void);
void interHelp(void);
void interMoveDic(void);
char *arg[MAX_ARG];
char *token;
int argv;
char firstToken[1000];
char check[1000];
extern char **environ;
int iterator;
int pid, cPid, status, tempPid;
int background = FALSE;
DIR *dp;
struct dirent *dirp;
char helpLine[MAX];
FILE *helpFileFp;
int lineCounter;
FILE *fpForExternal;
char readLine[MAX];
char *eToken;
void excuteCommand(char *command, char *desti, char *dDesti, char *source) {
background = FALSE;
token = (char*)strtok(command, DIVISION);
if(token == NULL) return;
else {
argv = 0;
strcpy(firstToken,token);
while(token){
arg[argv++] = token;
token = (char*)strtok(NULL, DIVISION);
}
arg[argv] = NULL;
}
if( argv > 1 ) {
if(!strcmp(arg[argv-1], "&")) {
background = TRUE;
argv--;
arg[argv] = NULL;
}
else {
strcpy(check, arg[argv-1]);
iterator = 0;
while(check[iterator] != (char)NULL) {
if(check[iterator] == '&' && check[iterator+1] == (char)NULL) {
background = TRUE;
check[iterator] = (char)NULL;
break;
}
iterator++;
}
strcpy(arg[argv-1], check);
}
}
if (!strcmp(firstToken, "quit"))
{
if ( argv > 1 ) {
for ( iterator=0;iterator 3) {
printf(FIND_ERROR_MSG);
}
else {
interMoveDic();
}
return;
}
if((pid=fork()) == -1) perror("process fork() failed\n");
else if(pid != 0) {
if(background)
cPid = waitpid(pid, &status, WNOHANG);
else
cPid = waitpid(pid, &status, 0);
}
else {
if(!strcmp(firstToken, "dir")) {
if( argv >= 3 || source[0] != (char)NULL) {
printf(ARGU_ERROR_MSG);
exit(1);
}
else {
if( desti[0] != (char)NULL){
freopen (desti,"w",stdout);
interDirectory();
fclose (stdout);
exit(0);
}
else if ( dDesti[0] != (char)NULL)
{
freopen (dDesti,"a",stdout);
interDirectory();
fclose (stdout);
exit(0);
}
}
interDirectory();
exit(0);
}
if(!strcmp(firstToken, "help")) {
if( argv > 1 || source[0] != (char)NULL) {
printf(FIND_ERROR_MSG);
exit(1);
}
else {
if( desti[0] != (char)NULL ) {
freopen (desti,"w",stdout);
interHelp();
fclose (stdout);
exit(0);
}
else if (dDesti[0] != (char)NULL) {
freopen (dDesti,"a",stdout);
interHelp();
fclose (stdout);
exit(0);
}
}
interHelp();
exit(0);
}
if(!strcmp(firstToken, "pause")) {
if( argv > 1) {
printf(FIND_ERROR_MSG);
exit(1);
}
else {
printf(" < PAUSE :: Please ENTER to release >\n");
interPause();
}
exit(0);
}
if(!strcmp(firstToken, "clr")){
if (argv > 1 ) {
printf(FIND_ERROR_MSG);
exit(1);
}
else {
system("clear");
}
exit(0);
}
if(!strcmp(firstToken, "environ")){
if (argv > 1 || source[0] != (char)NULL) {
printf(FIND_ERROR_MSG);
exit(1);
}
else {
if( desti[0] != (char)NULL) {
freopen (desti,"w",stdout);
interEnvi();
fclose (stdout);
exit(0);
}
else if( dDesti[0] != (char)NULL) {
freopen (dDesti,"a",stdout);
interEnvi();
fclose (stdout);
exit(0);
}
}
interEnvi();
exit(0);
}
if(!strcmp(firstToken, "echo")){
if( source[0] != (char)NULL) {
printf(FIND_ERROR_MSG);
exit(1);
}
else {
if ( desti[0] != (char)NULL) {
freopen (desti,"w",stdout);
interEcho();
fclose (stdout);
exit(0);
}
else if (dDesti[0] != (char)NULL) {
freopen (dDesti,"a",stdout);
interEcho();
fclose (stdout);
exit(0);
}
}
interEcho();
exit(0);
}
if( source[0] != (char)NULL ) {
fpForExternal = fopen(source, "r");
if (fpForExternal == NULL) {
perror(" myshell : ");
exit(1);
}
else {
while(!feof(fpForExternal)){
fgets(readLine,MAX,fpForExternal);
eToken = (char*)strtok(readLine, DIVISION);
while(eToken){
arg[argv++] = eToken;
eToken = (char*)strtok(NULL, DIVISION);
}
arg[argv] == NULL;
fclose(fpForExternal);
}
}
}
if( desti[0] != (char)NULL ) {
freopen (desti,"w",stdout);
}
else if( dDesti[0] != (char)NULL ) {
freopen (dDesti,"a",stdout);
}
if( execvp(firstToken, arg) == -1 ) {
printf(" myshell : command '%s' isn't the internal or the external command.\n", firstToken);
}
if( (desti[0] != (char)NULL) || (dDesti[0] != (char)NULL) ) {
fclose (stdout);
}
exit(1);
}
}
//////////////////////////////////////////////////////////////////////////////
// Function Name : interDirectory() //
// Brief Description : Display the contents of the inputed(or current) //
// directory to output stream //
// (primarily standard output stream is a monitor) //
//////////////////////////////////////////////////////////////////////////////
void interDirectory() {
int count;
if( arg[1] == NULL ) {
dp=opendir(".");
}
else if( arg[1] != NULL ) {
if( !(dp=opendir(arg[1])) ){
printf(" myshell : Inputed directory is not exist.\n");
exit(1);
}
}
count = 0;
printf("\n --- Directory contents --- \n");
while(dirp=readdir(dp)) {
printf("%s\t", dirp->d_name);
count++;
if( (count % 5) == 0) printf("\n");
}
printf("\n --- This is all of item(s) in directory --- \n\n");
closedir(dp);
}
//////////////////////////////////////////////////////////////////////////////
// Function Name : interPause() //
// Brief Description : Display the environment variable strings //
// to output stream //
// (primarily standard output stream is a monitor) //
//////////////////////////////////////////////////////////////////////////////
void interPause(void) {
char temp = 'X';
struct termios original_t, new_t;
do {
tcgetattr(fileno(stdin), &original_t);
new_t = original_t;
new_t.c_lflag &= ~(ICANON | ECHO);
tcsetattr(fileno(stdin), TCSAFLUSH, &new_t);
fflush(stdin);
temp = getchar();
tcsetattr(fileno(stdin), TCSANOW, &original_t);
} while(temp != '\n');
}
//////////////////////////////////////////////////////////////////////////////
// Function Name : interEnvi() //
// Brief Description : Display the environment variable strings //
// to output stream //
// (primarily standard output stream is a monitor) //
//////////////////////////////////////////////////////////////////////////////
void interEnvi(void) {
for(iterator = 0; environ[iterator] != NULL; iterator++)
printf("%s\n", environ[iterator]);
}
//////////////////////////////////////////////////////////////////////////////
// Function Name : interEcho() //
// Brief Description : Display some contents to output stream //
// (primarily standard output stream is a monitor) //
//////////////////////////////////////////////////////////////////////////////
void interEcho(void) {
iterator = 1;
while(arg[iterator]!= NULL)
printf("%s ", arg[iterator++]);
printf("\n");
}
//////////////////////////////////////////////////////////////////////////////
// Function Name : interHelp() //
// Brief Description : Display "readme.txt" files to output stream //
// (primarily standard output stream is a monitor) //
//////////////////////////////////////////////////////////////////////////////
void interHelp(void) {
helpFileFp = fopen("readme.txt", "r");
if (helpFileFp == NULL) {
perror(" myshell ");
exit(1);
}
else {
lineCounter = 0;
while(!feof(helpFileFp)) {
fgets(helpLine,MAX,helpFileFp);
printf("%s", helpLine);
lineCounter++;
if (lineCounter > 10) {
interPause();
}
}
fclose(helpFileFp);
}
}
//////////////////////////////////////////////////////////////////////////////
// Function Name : interMoveDic() //
// Brief Description : Move current directory to inputed path //
//////////////////////////////////////////////////////////////////////////////
void interMoveDic(void) {
char curDic2[MAX];
char *pwdForCh2;
int count = 0;
if(arg[1] == NULL) {
getcwd(curDic2, MAX);
printf(" Current directory : %s \n", curDic2);
}
else if( !(dp=opendir(arg[1])) ) {
perror(" myshell ");
}
else {
chdir(arg[1]);
getcwd(curDic2, MAX);
pwdForCh2 = (char *)malloc( 4 + strlen(curDic2) + 2);
strcat(pwdForCh2, "PWD=");
strcat(pwdForCh2, curDic2);
putenv(pwdForCh2);
}
}