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#include <errno.h>

#include <sys/stat.h>

#include <dirent.h>

char *

ttyname(fd)

int   fd;

{

   static char dev[] = "/dev";

   struct stat st, dst;

   DIR  *fp;

   struct dirent *d;

   static char name[NAME_MAX];

   int noerr = errno;

   if (fstat(fd, &st) < 0)

      return 0;

   if (!isatty(fd))

   {

      errno = ENOTTY;

      return 0;

   }

   fp = opendir(dev);

   if (fp == 0)

      return 0;

   strcpy(name, dev);

   strcat(name, "/");

   while ((d = readdir(fp)) != 0)

   {

      strcpy(name + sizeof(dev), d->d_name);

      if (stat(name, &dst) == 0

         && st.st_dev == dst.st_dev && st.st_ino == dst.st_ino)

      {

         closedir(fp);

         errno = noerr;

         return name;

      }

   }

   closedir(fp);

   errno = noerr;

   return 0;

}