386 peculiar files touchup

[unix-history] / usr / src / lib / libc / gen / ttyname.c

/*
* Copyright (c) 1988 The Regents of the University of California.
* All rights reserved.
*
* %sccs.include.redist.c%
*/

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ttyname.c   5.6 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/dir.h>
#include <sys/stat.h>
#include <sgtty.h>
#include <paths.h>

char *
ttyname(fd)
       int fd;
{
       register struct direct *dirp;
       register DIR *dp;
       struct stat sb1, sb2;
       struct sgttyb ttyb;
       static char buf[sizeof(_PATH_DEV) + MAXNAMLEN] = _PATH_DEV;
       char *rval, *strcpy();

       if (ioctl(fd, TIOCGETP, &ttyb) < 0)
               return(NULL);
       if (fstat(fd, &sb1) < 0 || (sb1.st_mode&S_IFMT) != S_IFCHR)
               return(NULL);
       if ((dp = opendir(_PATH_DEV)) == NULL)
               return(NULL);
       for (rval = NULL; dirp = readdir(dp);) {
               if (dirp->d_ino != sb1.st_ino)
                       continue;
               (void)strcpy(buf + sizeof(_PATH_DEV) - 1, dirp->d_name);
               if (stat(buf, &sb2) < 0 || sb1.st_dev != sb2.st_dev ||
                   sb1.st_ino != sb2.st_ino)
                       continue;
               closedir(dp);
               rval = buf;
               break;
       }
       closedir(dp);
       return(rval);
}