count

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/wait.h>
#include <fcntl.h>

char cmd[100];
char tokenOne[20];
char tokenTwo[20];
char tokenThree[20];
char tokenFour[20];
int numberOfTokens = 0;

void count(char option[],char fname[]);

int main(void)
{
while(1)
{
printf("MyShell$ ");
fgets(cmd,sizeof(cmd),stdin);

	numberOfTokens = sscanf(cmd,"%s%s%s%s",tokenOne,tokenTwo,tokenThree,tokenFour);
	
	if(strcmp(tokenOne,"exit") == 0)
	{
		printf("Exitting...\n\n");
		break;
	}

	switch(numberOfTokens)
	{
		case 1:

			if(fork() == 0)
			{
				execlp(tokenOne,tokenOne,NULL);
			}
			wait(0);
			break;

		case 2:
			if(fork() == 0)
			{
				execlp(tokenOne,tokenOne,tokenTwo,NULL);
			}
			wait(0);
			break;

		case 3:
			if(strcmp(tokenOne,"count") == 0)
			{
				count(tokenTwo,tokenThree);
			}
			else if(fork() == 0)
			{
				execlp(tokenOne,tokenOne,tokenTwo,tokenThree,NULL);
			}
			wait(0);
			break;

		case 4:

			if(fork() == 0)
			{
				execlp(tokenOne,tokenOne,tokenTwo,tokenThree,tokenFour,NULL);
			}
			wait(0);
			break;

		default:
			break;
	}
}

return(0);

}

void count(char option[], char fname[])
{

int charCount = 0;
int wordCount = 0;
int lineCount = 0;
char ch = '\0';

int handle = 0;

handle = open(fname,O_RDONLY);

if(handle == -1)
{
	printf("Error While Opening File '%s' !!!\n",fname);
	return;
}

while(read(handle,&ch,1))
{
	charCount++;

	if((ch == ' ') || (ch == '\t'))
	{
		wordCount++;
	}
	else if(ch == '\n')
	{
		wordCount++;
		lineCount++;
	}
}

if(strcmp(option,"c") == 0)
{
	// Character Count
	printf("\nNumber OF Character In '%s' File Is %d\n\n",fname,charCount);
}
else if(strcmp(option,"l") == 0)
{
	// line count
	printf("\nNumber Of Lines In '%s' File Is %d \n\n",fname,lineCount);
}
else if(strcmp(option,"w") == 0)
{
	// word count
	printf("\nNumber Of Words In '%s' File Is %d\n\n",fname,wordCount);
}

}