#include <stdio.h>
#include <string.h>

int
main (int argc, char *argv[])
{
  char c;
  char urlflag, urlbuf[256];
  char *ext = strrchr(argv[1], '.');

  if (NULL == ext) { // plain text
    fputs("<pre>\n", stdout);
    urlflag = -1;
    while (EOF != (c = getchar())) {
      if (urlflag > -1) {
        if ((urlflag == 0 && c == 'h') ||
            (urlflag == 1 && c == 't') ||
            (urlflag == 2 && c == 't') ||
            (urlflag == 3 && c == 'p')) {
          urlbuf[urlflag++] = c;
        } else if (urlflag < 4) { // not an url
          urlbuf[urlflag++] = c;
          urlbuf[urlflag] = 0;
          fputs(urlbuf, stdout);
          urlflag = -1;
        } else { // indeed an url
          urlbuf[urlflag++] = c;
          while ('>' != (c = getchar())) {
            if (c == '\n') {
              fputs("BROKEN README\n</pre>", stdout);
              return 1;
            } else {
              urlbuf[urlflag++] = c;
            }
          }
          urlbuf[urlflag] = 0;
          printf("<a href=\"%s\">%s</a>&gt;", urlbuf, urlbuf);
          urlflag = -1;
        }
      } else {
        switch (c) {
        case '<':
          urlflag++;
          fputs("&lt;", stdout);
          break;
        case '>':
          fputs("&gt;", stdout);
          break;
        case '&':
          fputs("&amp;", stdout);
          break;
        case '"':
          fputs("&quot;", stdout);
          break;
        default:
          putchar(c);
        }
      }
    }
    fputs("\n</pre>", stdout);
  } else if (0 == strcmp(".html", ext)) { // html
    while (EOF != (c = getchar())) {
      putchar(c);
    }
  }

  return 0;
}