toolchain/gcc/newlib/libc/stdio/rewind.c

   1 /*
   2  * Copyright (c) 1990 The Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms are permitted
   6  * provided that the above copyright notice and this paragraph are
   7  * duplicated in all such forms and that any documentation,
   8  * advertising materials, and other materials related to such
   9  * distribution and use acknowledge that the software was developed
  10  * by the University of California, Berkeley.  The name of the
  11  * University may not be used to endorse or promote products derived
  12  * from this software without specific prior written permission.
  13  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
  14  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
  15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  16  */
  17
  18 /*
  19 FUNCTION
  20 <<rewind>>---reinitialize a file or stream
  21
  22 INDEX
  23         rewind
  24 INDEX
  25         _rewind_r
  26
  27 ANSI_SYNOPSIS
  28         #include <stdio.h>
  29         void rewind(FILE *<[fp]>);
  30         void _rewind_r(struct _reent *<[ptr]>, FILE *<[fp]>);
  31
  32 TRAD_SYNOPSIS
  33         #include <stdio.h>
  34         void rewind(<[fp]>)
  35         FILE *<[fp]>;
  36
  37         void _rewind_r(<[ptr]>, <[fp]>)
  38         struct _reent *<[ptr]>;
  39         FILE *<[fp]>;
  40
  41 DESCRIPTION
  42 <<rewind>> returns the file position indicator (if any) for the file
  43 or stream identified by <[fp]> to the beginning of the file.  It also
  44 clears any error indicator and flushes any pending output.
  45
  46 RETURNS
  47 <<rewind>> does not return a result.
  48
  49 PORTABILITY
  50 ANSI C requires <<rewind>>.
  51
  52 No supporting OS subroutines are required.
  53 */
  54
  55 #if defined(LIBC_SCCS) && !defined(lint)
  56 static char sccsid[] = "%W% (Berkeley) %G%";
  57 #endif /* LIBC_SCCS and not lint */
  58
  59 #include <stdio.h>
  60
  61 void
  62 _DEFUN (_rewind_r, (ptr, fp),
  63         struct _reent * ptr _AND
  64         register FILE * fp)
  65 {
  66         (void) _fseek_r (ptr, fp, 0L, SEEK_SET);
  67         clearerr(fp);
  68 }
  69
  70 #ifndef _REENT_ONLY
  71
  72 void
  73 _DEFUN (rewind, (fp),
  74         register FILE * fp)
  75 {
  76         (void) _fseek_r (_REENT, fp, 0L, SEEK_SET);
  77 }
  78
  79 #endif /* !_REENT_ONLY */