newlib-2.4.0

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

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

@@ -0,0 +1,103 @@
+/*
+ * 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
+<<fgetpos>>---record position in a stream or file
+
+INDEX
+	fgetpos
+INDEX
+	_fgetpos_r
+
+ANSI_SYNOPSIS
+	#include <stdio.h>
+	int fgetpos(FILE *restrict <[fp]>, fpos_t *restrict <[pos]>);
+	int _fgetpos_r(struct _reent *<[ptr]>, FILE *restrict <[fp]>, fpos_t *restrict <[pos]>);
+
+TRAD_SYNOPSIS
+	#include <stdio.h>
+	int fgetpos(<[fp]>, <[pos]>)
+	FILE *<[fp]>;
+	fpos_t *<[pos]>;
+
+	int _fgetpos_r(<[ptr]>, <[fp]>, <[pos]>)
+	struct _reent *<[ptr]>;
+	FILE *<[fp]>;
+	fpos_t *<[pos]>;
+
+DESCRIPTION
+Objects of type <<FILE>> can have a ``position'' that records how much
+of the file your program has already read.  Many of the <<stdio>> functions
+depend on this position, and many change it as a side effect.
+
+You can use <<fgetpos>> to report on the current position for a file
+identified by <[fp]>; <<fgetpos>> will write a value
+representing that position at <<*<[pos]>>>.  Later, you can
+use this value with <<fsetpos>> to return the file to this
+position.
+
+In the current implementation, <<fgetpos>> simply uses a character
+count to represent the file position; this is the same number that
+would be returned by <<ftell>>.
+
+RETURNS
+<<fgetpos>> returns <<0>> when successful.  If <<fgetpos>> fails, the
+result is <<1>>.  Failure occurs on streams that do not support
+positioning; the global <<errno>> indicates this condition with the
+value <<ESPIPE>>.
+
+PORTABILITY
+<<fgetpos>> is required by the ANSI C standard, but the meaning of the
+value it records is not specified beyond requiring that it be
+acceptable as an argument to <<fsetpos>>.  In particular, other
+conforming C implementations may return a different result from
+<<ftell>> than what <<fgetpos>> writes at <<*<[pos]>>>.
+
+No supporting OS subroutines are required.
+*/
+
+#include <_ansi.h>
+#include <reent.h>
+#include <stdio.h>
+
+int
+_DEFUN(_fgetpos_r, (ptr, fp, pos),
+       struct _reent * ptr _AND
+       FILE *__restrict fp           _AND
+       _fpos_t *__restrict pos)
+{
+  *pos = _ftell_r (ptr, fp);
+
+  if (*pos != -1)
+    {
+      return 0;
+    }
+  return 1;
+}
+
+#ifndef _REENT_ONLY
+
+int
+_DEFUN(fgetpos, (fp, pos),
+       FILE *__restrict fp _AND
+       _fpos_t *__restrict pos)
+{
+  return _fgetpos_r (_REENT, fp, pos);
+}
+
+#endif /* !_REENT_ONLY */