sl@0: /* GETCHAR.C
sl@0:  * 
sl@0:  * Portions Copyright (c) 1990-2006 Nokia Corporation and/or its subsidiary(-ies).
sl@0:  * All rights reserved.
sl@0:  */
sl@0: 
sl@0: /*
sl@0:  * Copyright (c) 1990 The Regents of the University of California.
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms are permitted
sl@0:  * provided that the above copyright notice and this paragraph are
sl@0:  * duplicated in all such forms and that any documentation,
sl@0:  * advertising materials, and other materials related to such
sl@0:  * distribution and use acknowledge that the software was developed
sl@0:  * by the University of California, Berkeley.  The name of the
sl@0:  * University may not be used to endorse or promote products derived
sl@0:  * from this software without specific prior written permission.
sl@0:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
sl@0:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
sl@0:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
sl@0:  */
sl@0: 
sl@0: /*
sl@0: FUNCTION
sl@0: <<getchar>>---read a character (macro)
sl@0: 
sl@0: INDEX
sl@0: 	getchar
sl@0: INDEX
sl@0: 	_getchar_r
sl@0: 
sl@0: ANSI_SYNOPSIS
sl@0: 	#include <stdio.h>
sl@0: 	int getchar(void);
sl@0: 
sl@0: 	int _getchar_r(void *<[reent]>);
sl@0: 
sl@0: TRAD_SYNOPSIS
sl@0: 	#include <stdio.h>
sl@0: 	int getchar();
sl@0: 
sl@0: 	int _getchar_r(<[reent]>)
sl@0: 	char * <[reent]>;
sl@0: 
sl@0: DESCRIPTION
sl@0: <<getchar>> is a macro, defined in <<stdio.h>>.  You can use <<getchar>>
sl@0: to get the next single character from the standard input stream.
sl@0: As a side effect, <<getchar>> advances the standard input's
sl@0: current position indicator.
sl@0: 
sl@0: The alternate function <<_getchar_r>> is a reentrant version.  The
sl@0: extra argument <[reent]> is a pointer to a reentrancy structure.
sl@0: 
sl@0: 
sl@0: RETURNS
sl@0: The next character (read as an <<unsigned char>>, and cast to
sl@0: <<int>>), unless there is no more data, or the host system reports a
sl@0: read error; in either of these situations, <<getchar>> returns <<EOF>>.
sl@0: 
sl@0: You can distinguish the two situations that cause an <<EOF>> result by
sl@0: using `<<ferror(stdin)>>' and `<<feof(stdin)>>'.
sl@0: 
sl@0: PORTABILITY
sl@0: ANSI C requires <<getchar>>; it suggests, but does not require, that
sl@0: <<getchar>> be implemented as a macro.
sl@0: 
sl@0: Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
sl@0: <<lseek>>, <<read>>, <<sbrk>>, <<write>>.
sl@0: */
sl@0: 
sl@0: /*
sl@0:  * A subroutine version of the macro getchar.
sl@0:  */
sl@0: 
sl@0: #include <stdio_r.h>
sl@0: #include <reent.h>
sl@0: 
sl@0: #undef getchar
sl@0: 
sl@0: /**
sl@0: A reentrant version of getchar().
sl@0: */
sl@0: EXPORT_C int
sl@0: _getchar_r (struct _reent *f)
sl@0: {
sl@0:   return getc (_stdin_r (f));
sl@0: }
sl@0: 
sl@0: #ifndef _REENT_ONLY
sl@0: 
sl@0: /**
sl@0: Get the next character from stdin.Returns the next character from the
sl@0: standard input.
sl@0: 
sl@0: @return On Success, the character read is returned as an int. 
sl@0: 		On Failure, returns EOF, if the 'End Of File' is reached or there has
sl@0: 		been an error reading and errno may be set.
sl@0: */
sl@0: EXPORT_C int
sl@0: getchar (void)
sl@0: {
sl@0:   /* CHECK_INIT is called (eventually) by __srefill.  */
sl@0:   struct _reent *r = _REENT2;
sl@0:   if (!r)
sl@0: 	return EOF; // Memory for library globals is not allocated (errno not set).
sl@0:   return _getchar_r (r);
sl@0: }
sl@0: 
sl@0: #endif