CS 456 - Systems Programming Spring 2024

Displaying ./code/jan24/mycat.c

// a simple implentation of the cat command

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

int main(int argc, char **argv){

	//check if file was provided , otherwise print usage statement and exit
	if(argc < 2){
		fprintf(stderr, "Usage: %s file\n", argv[0]);
		exit(1);
	}	

	//read in a file from the command line
	int count = 0;
	FILE *fp = fopen(argv[1], "r");

	if (fp == NULL){
		fprintf(stderr, "File %s could not be opened\n", argv[1]);
		exit(1);
	}	

	int c;

	//count each character
	while((c =fgetc(fp))!= EOF){
		printf("%c", c);

	}	

	
	fclose(fp);

	//print the count and exit
	//printf("Characters in %s: %d\n", argv[1], count);
	return 0;

}