genericopenlibs/cstdlib/LSTDIO/GETCHAR.C
changeset 0 e4d67989cc36
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/genericopenlibs/cstdlib/LSTDIO/GETCHAR.C	Tue Feb 02 02:01:42 2010 +0200
@@ -0,0 +1,110 @@
+/* GETCHAR.C
+ * 
+ * Portions Copyright (c) 1990-2006 Nokia Corporation and/or its subsidiary(-ies).
+ * All rights reserved.
+ */
+
+/*
+ * 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(void *<[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>>.
+*/
+
+/*
+ * A subroutine version of the macro getchar.
+ */
+
+#include <stdio_r.h>
+#include <reent.h>
+
+#undef getchar
+
+/**
+A reentrant version of getchar().
+*/
+EXPORT_C int
+_getchar_r (struct _reent *f)
+{
+  return getc (_stdin_r (f));
+}
+
+#ifndef _REENT_ONLY
+
+/**
+Get the next character from stdin.Returns the next character from the
+standard input.
+
+@return On Success, the character read is returned as an int. 
+		On Failure, returns EOF, if the 'End Of File' is reached or there has
+		been an error reading and errno may be set.
+*/
+EXPORT_C int
+getchar (void)
+{
+  /* CHECK_INIT is called (eventually) by __srefill.  */
+  struct _reent *r = _REENT2;
+  if (!r)
+	return EOF; // Memory for library globals is not allocated (errno not set).
+  return _getchar_r (r);
+}
+
+#endif