/*
 * q2.c - display the size in bytes of the largest file in each directory
 * specified as command-line argument.
 *
 * Alan J Rosenthal, October 2000.
 */

#include <stdio.h>
#include <string.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>

int main(int argc, char **argv)
{
    DIR *dp;
    struct dirent *p;
    int i, status = 0, len;
    long max;
    char buf[200];
    struct stat statbuf;

    for (i = 1; i < argc; i++) {
	if ((len = strlen(argv[i])) + 2 > sizeof buf) {
	    fprintf(stderr, "%s: directory name too long\n", argv[i]);
	    status++;
	} else if ((dp = opendir(argv[i])) == NULL) {
	    perror(argv[i]);
	    status++;
	} else {
	    sprintf(buf, "%s/", argv[i]);
	    len++;  /* now buf[len] is the first byte after that slash */
	    max = 0;
	    while ((p = readdir(dp))) {
		if (strlen(p->d_name) + len + 1 > sizeof buf) {
		    buf[len] = '\0';
		    fprintf(stderr, "%s%s: filename too long\n", buf,
			    p->d_name);
		    /*
		     * use status=1 instead of status++ in case we have a lot
		     * of these
		     */
		    status = 1;
		} else {
		    strcpy(buf + len, p->d_name);  /* a concatenation */
		    if (stat(buf, &statbuf)) {
			perror(buf);
			status++;
		    } else if (statbuf.st_size > max) {
			max = statbuf.st_size;
		    }
		}
	    }
	    closedir(dp);
	    printf("%s: %ld\n", argv[i], max);
	}
    }

    return(status);
}