newlib-2.4.0

git-svn-id: svn://kolibrios.org@6536 a494cfbc-eb01-0410-851d-a64ba20cac60

contrib/sdk/sources/newlib/libc/stdio/getchar.c

@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 1990 The Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley.  The name of the
+ * University may not be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
+ */
+
+/*
+FUNCTION
+<<getchar>>---read a character (macro)
+
+INDEX
+	getchar
+INDEX
+	_getchar_r
+
+ANSI_SYNOPSIS
+	#include <stdio.h>
+	int getchar(void);
+
+	int _getchar_r(struct _reent *<[reent]>);
+
+TRAD_SYNOPSIS
+	#include <stdio.h>
+	int getchar();
+
+	int _getchar_r(<[reent]>)
+	char * <[reent]>;
+
+DESCRIPTION
+<<getchar>> is a macro, defined in <<stdio.h>>.  You can use <<getchar>>
+to get the next single character from the standard input stream.
+As a side effect, <<getchar>> advances the standard input's
+current position indicator.
+
+The alternate function <<_getchar_r>> is a reentrant version.  The
+extra argument <[reent]> is a pointer to a reentrancy structure.
+
+
+RETURNS
+The next character (read as an <<unsigned char>>, and cast to
+<<int>>), unless there is no more data, or the host system reports a
+read error; in either of these situations, <<getchar>> returns <<EOF>>.
+
+You can distinguish the two situations that cause an <<EOF>> result by
+using `<<ferror(stdin)>>' and `<<feof(stdin)>>'.
+
+PORTABILITY
+ANSI C requires <<getchar>>; it suggests, but does not require, that
+<<getchar>> be implemented as a macro.
+
+Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
+<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
+*/
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "%W% (Berkeley) %G%";
+#endif /* LIBC_SCCS and not lint */
+
+/*
+ * A subroutine version of the macro getchar.
+ */
+
+#include <_ansi.h>
+#include <reent.h>
+#include <stdio.h>
+#include "local.h"
+
+#undef getchar
+
+int
+_DEFUN(_getchar_r, (reent),
+       struct _reent *reent)
+{
+  _REENT_SMALL_CHECK_INIT (reent);
+  return _getc_r (reent, _stdin_r (reent));
+}
+
+#ifndef _REENT_ONLY
+
+int
+_DEFUN_VOID(getchar)
+{
+  struct _reent *reent = _REENT;
+
+  /* CHECK_INIT is called (eventually) by __srefill_r.  */
+  _REENT_SMALL_CHECK_INIT (reent);
+  return _getc_r (reent, _stdin_r (reent));
+}
+
+#endif