openpty: Remove code that has been disabled for more than 20 years

The use of ptsname_r instead of the custom pts_name seems to have proven
in the field.

Signed-off-by: Marcus Haehnel <marcus.haehnel@kernkonzept.com>

libutil/openpty.c

@@ -26,61 +26,6 @@
 #include <unistd.h>
 #include <sys/types.h>
 
-/* BCS: the following function is, IMO, overkill */
-#if 0
-/* Return the result of ptsname_r in the buffer pointed to by PTS,
-   which should be of length BUF_LEN.  If it is too long to fit in
-   this buffer, a sufficiently long buffer is allocated using malloc,
-   and returned in PTS.  0 is returned upon success, -1 otherwise.  */
-static int
-pts_name (int fd, char **pts, size_t buf_len)
-{
-  int rv;
-  char *buf = *pts;
-
-  for (;;)
-    {
-      char *new_buf;
-
-      if (buf_len)
-	{
-	  rv = ptsname_r (fd, buf, buf_len);
-
-	  if (rv != 0 || memchr (buf, '\0', buf_len))
-	    /* We either got an error, or we succeeded and the
-	       returned name fit in the buffer.  */
-	    break;
-
-	  /* Try again with a longer buffer.  */
-	  buf_len += buf_len;	/* Double it */
-	}
-      else
-	/* No initial buffer; start out by mallocing one.  */
-	buf_len = 128;		/* First time guess.  */
-
-      if (buf != *pts)
-	/* We've already malloced another buffer at least once.  */
-	new_buf = realloc (buf, buf_len);
-      else
-	new_buf = malloc (buf_len);
-      if (! new_buf)
-	{
-	  rv = -1;
-	  __set_errno (ENOMEM);
-	  break;
-	}
-      buf = new_buf;
-    }
-
-  if (rv == 0)
-    *pts = buf;		/* Return buffer to the user.  */
-  else if (buf != *pts)
-    free (buf);		/* Free what we malloced when returning an error.  */
-
-  return rv;
-}
-#endif
-
 /* Create pseudo tty master slave pair and set terminal attributes
    according to TERMP and WINP.  Return handles for both ends in
    AMASTER and ASLAVE, and return the name of the slave end in NAME.  */
@@ -88,19 +33,10 @@ int
 openpty (int *amaster, int *aslave, char *name, const struct termios *termp,
 	 const struct winsize *winp)
 {
-#if 0
-#ifdef PATH_MAX
-  char _buf[PATH_MAX];
-#else
-  char _buf[512];
-#endif
-  char *buf = _buf;
-#else
 #ifdef PATH_MAX
   char buf[PATH_MAX];
 #else
   char buf[512];
-#endif
 #endif
   int master, slave;
 
@@ -114,20 +50,12 @@ openpty (int *amaster, int *aslave, char *name, const struct termios *termp,
   if (unlockpt (master))
     goto fail;
 
-#if 0
-  if (pts_name (master, &buf, sizeof (_buf)))
-#else
   if (ptsname_r (master, buf, sizeof buf))
-#endif
     goto fail;
 
   slave = open (buf, O_RDWR | O_NOCTTY);
   if (slave == -1)
     {
-#if 0
-      if (buf != _buf)
-	free (buf);
-#endif
       goto fail;
     }
 
@@ -142,10 +70,6 @@ openpty (int *amaster, int *aslave, char *name, const struct termios *termp,
   if (name != NULL)
     strcpy (name, buf);
 
-#if 0
-  if (buf != _buf)
-    free (buf);
-#endif
   return 0;
 
  fail: