tinystdio: added fgetpos and fsetpos files

added fgetpos.c and fsetpos.c files to resolve compilation error of:
undefined symbol: fgetpos
undefined symbol: fsetpos

changed the prototype of these functions in the file stdio.h to match
with the ISO/IEC 9899_1999

Signed-off-by: Hana Ashour <[email protected]>

newlib/libc/tinystdio/fgetpos.c

@@ -0,0 +1,77 @@
+/*
+ * 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,
+ * and/or 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
+
+SYNOPSIS
+	#include <stdio.h>
+	int fgetpos(FILE *restrict <[fp]>, fpos_t *restrict <[pos]>);
+	int fgetpos( FILE *restrict <[fp]>, fpos_t *restrict <[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 <stdio_private.h>
+
+int
+fgetpos (
+       FILE *__restrict fp,
+       _fpos_t *__restrict pos)
+{
+  *pos = ftell ( fp);
+
+  if (*pos != -1)
+    {
+      return 0;
+    }
+  return 1;
+}

newlib/libc/tinystdio/fsetpos.c

@@ -0,0 +1,69 @@
+/*
+ * 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,
+ * and/or 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
+<<fsetpos>>---restore position of a stream or file
+
+INDEX
+	fsetpos
+INDEX
+	_fsetpos_r
+
+SYNOPSIS
+	#include <stdio.h>
+	int fsetpos(FILE *<[fp]>, const fpos_t *<[pos]>);
+	int fsetpos( FILE *<[fp]>,
+	               const 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 <<fsetpos>> to return the file identified by <[fp]> to a previous
+position <<*<[pos]>>> (after first recording it with <<fgetpos>>).
+
+See <<fseek>> for a similar facility.
+
+RETURNS
+<<fgetpos>> returns <<0>> when successful.  If <<fgetpos>> fails, the
+result is <<1>>.  The reason for failure is indicated in <<errno>>:
+either <<ESPIPE>> (the stream identified by <[fp]> doesn't support
+repositioning) or <<EINVAL>> (invalid file position).
+
+PORTABILITY
+ANSI C requires <<fsetpos>>, but does not specify the nature of
+<<*<[pos]>>> beyond identifying it as written by <<fgetpos>>.
+
+Supporting OS subroutines required: <<close>>, <<fstat>>, <<isatty>>,
+<<lseek>>, <<read>>, <<sbrk>>, <<write>>.
+*/
+
+#include <stdio_private.h>
+
+int
+fsetpos (
+       FILE * iop,
+       const _fpos_t * pos)
+{
+  int x = fseek ( iop, *pos, SEEK_SET);
+
+  if (x != 0)
+    return 1;
+  return 0;
+}

newlib/libc/tinystdio/meson.build

@@ -56,6 +56,7 @@ srcs_tinystdio = [
   'ferror.c',
   'fflush.c',
   'fgetc.c',
+  'fgetpos.c',
   'fgets.c',
   'fgetwc.c',
   'fgetws.c',
@@ -74,6 +75,7 @@ srcs_tinystdio = [
   'fscanf.c',
   'fseek.c',
   'fseeko.c',
+  'fsetpos.c',
   'ftell.c',
   'ftello.c',
   'ftox_engine.c',

newlib/libc/tinystdio/stdio.h

@@ -300,14 +300,14 @@ int	ferror(FILE *__stream);
 #endif
 
 __extension__ typedef _fpos_t fpos_t;
-int fgetpos(FILE *stream, fpos_t *pos);
+int fgetpos(FILE * restrict stream, fpos_t * restrict pos);
 FILE *fopen(const char *path, const char *mode) __malloc_like_with_free(fclose, 1);
 FILE *freopen(const char *path, const char *mode, FILE *stream);
 FILE *fdopen(int, const char *) __malloc_like_with_free(fclose, 1);
 FILE *fmemopen(void *buf, size_t size, const char *mode) __malloc_like_with_free(fclose, 1);
 int fseek(FILE *stream, long offset, int whence);
 int fseeko(FILE *stream, __off_t offset, int whence);
-int fsetpos(FILE *stream, fpos_t *pos);
+int fsetpos(FILE *stream, const fpos_t *pos);
 long ftell(FILE *stream);
 __off_t ftello(FILE *stream);
 int fileno(FILE *);