/*
 * Version of countchars.c that reads and writes files.
 *
 * Filenames are specified as command-line arguments.
 */
#include <stdio.h>
#include <ctype.h>

int main(int argc, char* argv[]) {
	if (argc < 3) {
		fprintf(stderr, "usage %s infile outfile\n", argv[0]);
		return 1;
	}
	FILE * infile = fopen(argv[1], "r");
	if (infile == NULL) {
		fprintf(stderr, "infile could not be opened\n");
		return 1;
	}
	FILE * outfile = fopen(argv[2], "w");
	if (outfile == NULL) {
		fprintf(stderr, "outfile could not be opened\n");
		return 1;
	}

	int inchar;
	int count = 0;
	while ((inchar = fgetc(infile)) != EOF) {
		count += 1;
		fputc(toupper(inchar), outfile);
	}
	fclose(infile);
	fclose(outfile);
	printf("%d chars\n", count);
	return 0;
}