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

#define HTML_DIR "/home/jskim/public_html/animal/EngNames"
#define URL_HEADER "http://AnimalPicturesArchive.com/animal/EngNames"

#define FILE_NAME_LEN 100
#define MAX_FILE_NUM 8192

char fname[MAX_FILE_NUM][FILE_NAME_LEN];

main()
{
    DIR *dirp;
    struct dirent *direntp;
    
    char *ptr;
    
    int cnt;
    time_t curTime;

    int idx;	/* general purposes */

/*
    printf("Content-type: text/html\n\n");
*/
    
    cnt = 0;
    dirp = opendir( HTML_DIR );
    while ( (direntp = readdir( dirp )) != NULL ) {
	if (!strcmp(direntp->d_name, ".html")) continue;
	if (!strncmp(direntp->d_name, "index", 5)) continue;
	ptr = (char *) strstr(direntp->d_name, ".");
	if (!strcmp(ptr+1, "html")) {
	    strcpy(fname[cnt], direntp->d_name);
	    cnt++;
	}
    }
    closedir( dirp );
    
    time(&curTime);
    idx = curTime%cnt;

    printf("Location: %s/%s\n\n", URL_HEADER, fname[idx]);
    
    exit(0);
}