4.3BSD - /usr/src/usr.lib/libU77/ftell_.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  *
   6:  *	@(#)ftell_.c	5.1	6/7/85
   7:  */
   8: 
   9: /*
  10:  * return current file position
  11:  *
  12:  * calling sequence:
  13:  *	integer curpos, ftell
  14:  *	curpos = ftell(lunit)
  15:  * where:
  16:  *	lunit is an open logical unit
  17:  *	curpos will be the current offset in bytes from the start of the
  18:  *		file associated with that logical unit
  19:  *		or a (negative) system error code.
  20:  */
  21: 
  22: #include    "../libI77/fiodefs.h"
  23: #include    "../libI77/f_errno.h"
  24: 
  25: extern unit units[];
  26: 
  27: long ftell_(lu)
  28: long *lu;
  29: {
  30:     if (*lu < 0 || *lu >= MXUNIT)
  31:         return(-(long)(errno=F_ERUNIT));
  32:     if (!units[*lu].ufd)
  33:         return(-(long)(errno=F_ERNOPEN));
  34:     return(ftell(units[*lu].ufd));
  35: }

Defined functions