#include <stdio.h>

FILE *file_open(fname, mode)
	char *fname;
	char *mode;
{
	FILE *fp;
	if ((fp = fopen(fname, mode)) == NULL) {
		fprintf(stderr, "can't open %s\n", fname);
		return NULL;
	}
	else
		return fp;
}

main(argc, argv)
	int argc;
	char *argv[];
{
	FILE *fp;

	while(argc > 1) {
		if((fp = file_open(argv[1], "r")) != NULL) {
			printf("opening %s\n", argv[1]);
			fclose(fp);
		}
			argc--;
			argv++;
	}

	exit(0);
}