YTHT源码nju09下的bbsicon.c,程序如下，我想问一下，这个程序指明如果不需要版面图片
，那么应该怎么做？感谢!!!
#include "bbslib.h"

int
bbsicon_main()
{
        char board[40], buf[STRLEN * 2];
        struct boardmem *x1;
        struct mmapfile mf = { ptr:NULL };
        getparmboard(board, sizeof (board));
        x1 = getboard2(board);
        if (!x1 || !x1->wwwicon) {
                html_header(1);
                http_fatal("无法打开文件");
                return 0;
        }
        sprintf(buf, "ftphome/root/boards/%s/html/icon.gif", board);

        if (cache_header(file_time(buf), 10000)) {
                return 0;
        }
        if (file_size(buf) > 1024 * 20) {
                html_header(1);
                http_fatal("文件过大，请用 ftp 下载");
        }
        MMAP_TRY {
                if (mmapfile(buf, &mf)) {
                        MMAP_UNTRY;
                        http_fatal("错误的文件名");
                }
                printf("Content-type: %s\n\n", get_mime_type("icon.gif"));
                //printf("Content-Length: %d\n\n", mf.size);
                fwrite(mf.ptr, 1, mf.size, stdout);
        }
        MMAP_CATCH {
        }
        MMAP_END {
                mmapfile(NULL, &mf);
        }
        return 0;
}
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