newlib/libc/stdio/putchar.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  * and/or 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 <<putchar>>---write a character (macro)
  21
  22 INDEX
  23         putchar
  24 INDEX
  25         _putchar_r
  26
  27 SYNOPSIS
  28         #include <stdio.h>
  29         int putchar(int <[ch]>);
  30
  31         int _putchar_r(struct _reent *<[reent]>, int <[ch]>);
  32
  33 DESCRIPTION
  34 <<putchar>> is a macro, defined in <<stdio.h>>.  <<putchar>>
  35 writes its argument to the standard output stream,
  36 after converting it from an <<int>> to an <<unsigned char>>.
  37
  38 The alternate function <<_putchar_r>> is a reentrant version.  The
  39 extra argument <[reent]> is a pointer to a reentrancy structure.
  40
  41 RETURNS
  42 If successful, <<putchar>> returns its argument <[ch]>.  If an error
  43 intervenes, the result is <<EOF>>.  You can use `<<ferror(stdin)>>' to
  44 query for errors.
  45
  46 PORTABILITY
  47 ANSI C requires <<putchar>>; it suggests, but does not require, that
  48 <<putchar>> be implemented as a macro.
  49
  50 Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
  51 <<lseek>>, <<read>>, <<sbrk>>, <<write>>.
  52 */
  53
  54 #if defined(LIBC_SCCS) && !defined(lint)
  55 static char sccsid[] = "%W% (Berkeley) %G%";
  56 #endif /* LIBC_SCCS and not lint */
  57
  58 /*
  59  * A subroutine version of the macro putchar.
  60  */
  61
  62 #include <_ansi.h>
  63 #include <reent.h>
  64 #include <stdio.h>
  65 #include "local.h"
  66
  67 #undef putchar
  68
  69 int
  70 _putchar_r (struct _reent *ptr,
  71        int c)
  72 {
  73   _REENT_SMALL_CHECK_INIT (ptr);
  74   return _putc_r (ptr, c, _stdout_r (ptr));
  75 }
  76
  77 #ifndef _REENT_ONLY
  78
  79 int
  80 putchar (int c)
  81 {
  82   struct _reent *reent = _REENT;
  83
  84   _REENT_SMALL_CHECK_INIT (reent);
  85   return _putc_r (reent, c, _stdout_r (reent));
  86 }
  87
  88 #endif