PR 78534, 83704 Handle large formatted I/O

In order to handle large characters when doing formatted I/O, use
size_t and ptrdiff_t for lengths.  Compared to the previous patch,
based on discussions on IRC use size_t for sizes that don't need to be
negative rather than ptrdiff_t everywhere.

Regtested on x86_64-pc-linux-gnu, approved as part of the PR 78534
approval, committed to trunk.

libgfortran/ChangeLog:

2018-01-07  Janne Blomqvist  <jb@gcc.gnu.org>

	PR fortran/78534
	PR fortran/83704
	* io/fbuf.c (fbuf_init): Use size_t instead of int for length.
	(fbuf_debug): Convert debug output to unsigned long.
	(fbuf_reset): Use ptrdiff_t for return value.
	(fbuf_alloc): Use size_t for length argument.
	(fbuf_flush): Handle large buffers.
	(fbuf_flush_list): Likewise.
	(fbuf_seek): Use ptrdiff_t for offset and return value.
	(fbuf_read): Use size_t for length argument.
	(fbuf_getc_refill): Use size_t to match fbuf_read.
	* io/fbuf.h (struct fbuf): Use size_t for lengths.
	(fbuf_init): Use size_t instead of int for length.
	(fbuf_reset): Use ptrdiff_t for return value.
	(fbuf_alloc): Use size_t for length argument.
	(fbuf_seek): Use ptrdiff_t for offset and return value.
	(fbuf_read): Use size_t for length argument.
	* io/io.h (read_block_form): Likewise.
	(read_block_form4): Likewise.
	(write_block): Likewise.
	(read_a): Likewise.
	(read_a_char4): Likewise.
	(read_x): Likewise.
	(write_a): Likewise.
	(write_a_char4): Likewise.
	* io/list_read.c (list_formatted_read_scalar): Use size_t to
	handle large buffers.
	* io/read.c (read_l): Likewise.
	(read_utf8): Likewise.
	(read_utf8_char1): Likewise.
	(read_default_char1): Likewise.
	(read_utf8_char4): Likewise.
	(read_default_char4): Likewise.
	(read_a): Likewise.
	(read_a_char4): Likewise.
	(eat_leading_spaces): Likewise.
	(next_char): Likewise.
	(read_decimal): Likewise.
	(read_radix): Likewise.
	(read_f): Likewise.
	(read_x): Likewise.
	* io/transfer.c (read_sf_internal): Likewise.
	(read_sf): Likewise.
	(read_block_form): Likewise.
	(read_block_form4): Likewise.
	(write_block): Likewise.
	(formatted_transfer_scalar_write): Likewise.
	(next_record_w): Likewise.
	* io/unix.c (mem_alloc_r): Likewise.
	(mem_alloc_r4): Likewise.
	(mem_alloc_w): Likewise.
	(mem_alloc_w4): Likewise.
	(mem_read): Likewise.
	(mem_read4): Likewise.
	(mem_write): Likewise.
	(mem_write4): Likewise.
	(open_internal): Likewise.
	(open_internal4): Likewise.
	* io/unix.h (open_internal): Likewise.
	(open_internal4): Likewise.
	(mem_alloc_w): Likewise.
	(mem_alloc_r): Likewise.
	(mem_alloc_w4): Likewise.
	(mem_alloc_r4): Likewise.
	* io/write.c (write_check_cc): Likewise.
	(write_cc): Likewise.
	(write_a): Likewise.
	(write_a_char4): Likewise.

From-SVN: r256322

1 files changed, 8 insertions, 8 deletions

diff --git a/libgfortran/io/fbuf.h b/libgfortran/io/fbuf.h
index 8dd94dbc08e..71b6d0fcccf 100644
--- a/libgfortran/io/fbuf.h
+++ b/libgfortran/io/fbuf.h
@@ -39,21 +39,21 @@ see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
 struct fbuf
 {
   char *buf;			/* Start of buffer.  */
-  int len;			/* Length of buffer.  */
-  int act;			/* Active bytes in buffer.  */
-  int pos;			/* Current position in buffer.  */
+  size_t len;			/* Length of buffer.  */
+  size_t act;			/* Active bytes in buffer.  */
+  size_t pos;			/* Current position in buffer.  */
 };
 
-extern void fbuf_init (gfc_unit *, int);
+extern void fbuf_init (gfc_unit *, size_t);
 internal_proto(fbuf_init);
 
 extern void fbuf_destroy (gfc_unit *);
 internal_proto(fbuf_destroy);
 
-extern int fbuf_reset (gfc_unit *);
+extern ptrdiff_t fbuf_reset (gfc_unit *);
 internal_proto(fbuf_reset);
 
-extern char *fbuf_alloc (gfc_unit *, int);
+extern char *fbuf_alloc (gfc_unit *, size_t);
 internal_proto(fbuf_alloc);
 
 extern int fbuf_flush (gfc_unit *, unit_mode);
@@ -62,10 +62,10 @@ internal_proto(fbuf_flush);
 extern int fbuf_flush_list (gfc_unit *, unit_mode);
 internal_proto(fbuf_flush_list);
 
-extern int fbuf_seek (gfc_unit *, int, int);
+extern ptrdiff_t fbuf_seek (gfc_unit *, ptrdiff_t, int);
 internal_proto(fbuf_seek);
 
-extern char *fbuf_read (gfc_unit *, int *);
+extern char *fbuf_read (gfc_unit *, size_t *);
 internal_proto(fbuf_read);
 
 /* Never call this function, only use fbuf_getc().  */