4.3BSD - /usr/src/usr.lib/libU77/fseek_.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:  *	@(#)fseek_.c	5.1	6/7/85
   7:  */
   8: 
   9: /*
  10:  * position a file associated with a fortran logical unit
  11:  *
  12:  * calling sequence:
  13:  *	ierror = fseek(lunit, ioff, ifrom)
  14:  * where:
  15:  *	lunit is an open logical unit
  16:  *	ioff is an offset in bytes relative to the position specified by ifrom
  17:  *	ifrom	- 0 means 'beginning of the file'
  18:  *		- 1 means 'the current position'
  19:  *		- 2 means 'the end of the file'
  20:  *	ierror will be 0 if successful, a system error code otherwise.
  21:  */
  22: 
  23: #include    <stdio.h>
  24: #include    "../libI77/f_errno.h"
  25: #include    "../libI77/fiodefs.h"
  26: 
  27: extern unit units[];
  28: 
  29: long fseek_(lu, off, from)
  30: long *lu, *off, *from;
  31: {
  32:     if (*lu < 0 || *lu >= MXUNIT)
  33:         return((long)(errno=F_ERUNIT));
  34:     if (*from < 0 || *from > 2)
  35:         return((long)(errno=F_ERARG));
  36:     if (!units[*lu].ufd)
  37:         return((long)(errno=F_ERNOPEN));
  38:     if (fseek(units[*lu].ufd, *off, (int)*from) < 0)
  39:         return((long)errno);
  40:     return(0L);
  41: }

Defined functions