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Add scm_t_off' type so that scm_t_port' has a fixed layout.

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* libguile/gen-scmconfig.c (main): Produce a definition for
  `scm_t_off'.

* libguile/ports.h (scm_t_port)[read_buf_size, saved_read_buf_size,
  write_buf_size, seek, truncate]: Use `scm_t_off' instead of `off_t' so
  that the layout and size of the structure does not depend on the
  application's `_FILE_OFFSET_BITS' value.  Reported by Bill
  Schottstaedt, see
  http://lists.gnu.org/archive/html/bug-guile/2009-06/msg00018.html.
  (scm_set_port_seek, scm_set_port_truncate): Update.

* libguile/ports.c (scm_set_port_seek, scm_set_port_truncate): Use
  `scm_t_off' and `off_t_or_off64_t'.

* libguile/fports.c (fport_seek, fport_truncate): Use `scm_t_off'
  instead of `off_t'.

* libguile/r6rs-ports.c (bip_seek, cbp_seek, bop_seek): Use `scm_t_off'
  instead of `off_t'.

* libguile/rw.c (scm_write_string_partial): Likewise.

* libguile/strports.c (st_resize_port, st_seek, st_truncate): Likewise.

* doc/ref/api-io.texi (Port Implementation): Update prototype of
  `scm_set_port_seek ()' and `scm_set_port_truncate ()'.

* NEWS: Update.
This commit is contained in:
Ludovic Courtès 2009-06-25 23:32:44 +02:00
parent 376b6bd7a2
commit f1ce919933
9 changed files with 66 additions and 46 deletions
Download patch file Download diff file Expand all files Collapse all files

5
NEWS
View file

@ -511,6 +511,11 @@ This procedure corresponds to Scheme's `module-public-interface'.
** `scm_stat' has an additional argument, `exception_on_error'
** `scm_primitive_load_path' has an additional argument `exception_on_not_found'
** `scm_set_port_seek' and `scm_set_port_truncate' use the `scm_t_off' type
Previously they would use the `off_t' type, which is fragile since its
definition depends on the application's value for `_FILE_OFFSET_BITS'.
* Changes to the distribution
** Guile's license is now LGPLv3+

4
doc/ref/api-io.texi
View file

@ -1531,7 +1531,7 @@ implementations take care to avoid this problem.
The procedure is set using
@deftypefun void scm_set_port_seek (scm_t_bits tc, off_t (*seek) (SCM port, off_t offset, int whence))
@deftypefun void scm_set_port_seek (scm_t_bits tc, scm_t_off (*seek) (SCM port, scm_t_off offset, int whence))
@end deftypefun
@item truncate
@ -1539,7 +1539,7 @@ Truncate the port data to be specified length. It can be assumed that the
current state of @code{rw_active} is @code{SCM_PORT_NEITHER}.
Set using
@deftypefun void scm_set_port_truncate (scm_t_bits tc, void (*truncate) (SCM port, off_t length))
@deftypefun void scm_set_port_truncate (scm_t_bits tc, void (*truncate) (SCM port, scm_t_off length))
@end deftypefun
@end table

12
libguile/fports.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2003, 2004, 2006, 2007, 2008 Free Software Foundation, Inc.
/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2002, 2003, 2004, 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@ -671,8 +671,8 @@ fport_seek_or_seek64 (SCM port, off_t_or_off64_t offset, int whence)
fport_seek already. */
#if GUILE_USE_64_CALLS && HAVE_STAT64 && SIZEOF_OFF_T != SIZEOF_OFF64_T
static off_t
fport_seek (SCM port, off_t offset, int whence)
static scm_t_off
fport_seek (SCM port, scm_t_off offset, int whence)
{
off64_t rv = fport_seek_or_seek64 (port, (off64_t) offset, whence);
if (rv > OFF_T_MAX || rv < OFF_T_MIN)
@ -680,7 +680,7 @@ fport_seek (SCM port, off_t offset, int whence)
errno = EOVERFLOW;
scm_syserror ("fport_seek");
}
return (off_t) rv;
return (scm_t_off) rv;
}
#else
@ -696,7 +696,7 @@ scm_i_fport_seek (SCM port, SCM offset, int how)
}
static void
fport_truncate (SCM port, off_t length)
fport_truncate (SCM port, scm_t_off length)
{
scm_t_fport *fp = SCM_FSTREAM (port);
@ -748,7 +748,7 @@ fport_write (SCM port, const void *data, size_t size)
}
{
off_t space = pt->write_end - pt->write_pos;
scm_t_off space = pt->write_end - pt->write_pos;
if (size <= space)
{

18
libguile/gen-scmconfig.c
View file

@ -400,6 +400,24 @@ main (int argc, char *argv[])
pf ("#define SCM_HAVE_READDIR64_R 0 /* 0 or 1 */\n");
#endif
/* Arrange so that we have a file offset type that reflects the one
used when compiling Guile, regardless of what the application's
`_FILE_OFFSET_BITS' says. See
http://lists.gnu.org/archive/html/bug-guile/2009-06/msg00018.html
for the original bug report.
Note that we can't define `scm_t_off' in terms of `off_t' or
`off64_t' because they may or may not be available depending on
how the application that uses Guile is compiled. */
#if defined GUILE_USE_64_CALLS && defined HAVE_STAT64
pf ("typedef scm_t_int64 scm_t_off;\n");
#elif SIZEOF_OFF_T == SIZEOF_INT
pf ("typedef int scm_t_off;\n");
#else
pf ("typedef long int scm_t_off;\n");
#endif
#if USE_DLL_IMPORT
pf ("\n");
pf ("/* Define some additional CPP macros on Win32 platforms. */\n");

15
libguile/ports.c
View file

@ -222,15 +222,14 @@ scm_set_port_close (scm_t_bits tc, int (*close) (SCM))
}
void
scm_set_port_seek (scm_t_bits tc, off_t (*seek) (SCM port,
off_t OFFSET,
int WHENCE))
scm_set_port_seek (scm_t_bits tc,
scm_t_off (*seek) (SCM, scm_t_off, int))
{
scm_ptobs[SCM_TC2PTOBNUM (tc)].seek = seek;
}
void
scm_set_port_truncate (scm_t_bits tc, void (*truncate) (SCM port, off_t length))
scm_set_port_truncate (scm_t_bits tc, void (*truncate) (SCM, scm_t_off))
{
scm_ptobs[SCM_TC2PTOBNUM (tc)].truncate = truncate;
}
@ -1399,15 +1398,15 @@ SCM_DEFINE (scm_seek, "seek", 3, 0, 0,
else if (SCM_OPPORTP (fd_port))
{
scm_t_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (fd_port);
off_t off = scm_to_off_t (offset);
off_t rv;
off_t_or_off64_t off = scm_to_off_t_or_off64_t (offset);
off_t_or_off64_t rv;
if (!ptob->seek)
SCM_MISC_ERROR ("port is not seekable",
scm_cons (fd_port, SCM_EOL));
else
rv = ptob->seek (fd_port, off, how);
return scm_from_off_t (rv);
return scm_from_off_t_or_off64_t (rv);
}
else /* file descriptor?. */
{
@ -1496,7 +1495,7 @@ SCM_DEFINE (scm_truncate_file, "truncate-file", 1, 1, 0,
}
else if (SCM_OPOUTPORTP (object))
{
off_t c_length = scm_to_off_t (length);
off_t_or_off64_t c_length = scm_to_off_t_or_off64_t (length);
scm_t_port *pt = SCM_PTAB_ENTRY (object);
scm_t_ptob_descriptor *ptob = scm_ptobs + SCM_PTOBNUM (object);

20
libguile/ports.h
View file

@ -29,8 +29,6 @@
#include "libguile/struct.h"
#include "libguile/threads.h"
/* Not sure if this is a good idea. We need it for off_t. */
#include <sys/types.h>
@ -70,7 +68,7 @@ typedef struct
unsigned char *read_buf; /* buffer start. */
const unsigned char *read_pos;/* the next unread char. */
unsigned char *read_end; /* pointer to last buffered char + 1. */
off_t read_buf_size; /* size of the buffer. */
scm_t_off read_buf_size; /* size of the buffer. */
/* when chars are put back into the buffer, e.g., using peek-char or
unread-string, the read-buffer pointers are switched to cbuf.
@ -79,7 +77,7 @@ typedef struct
unsigned char *saved_read_buf;
const unsigned char *saved_read_pos;
unsigned char *saved_read_end;
off_t saved_read_buf_size;
scm_t_off saved_read_buf_size;
/* write requests are saved into this buffer at write_pos until it
reaches write_buf + write_buf_size, then the ptob flush is
@ -88,7 +86,7 @@ typedef struct
unsigned char *write_buf; /* buffer start. */
unsigned char *write_pos; /* pointer to last buffered char + 1. */
unsigned char *write_end; /* pointer to end of buffer + 1. */
off_t write_buf_size; /* size of the buffer. */
scm_t_off write_buf_size; /* size of the buffer. */
unsigned char shortbuf; /* buffer for "unbuffered" streams. */
@ -185,8 +183,8 @@ typedef struct scm_t_ptob_descriptor
int (*fill_input) (SCM port);
int (*input_waiting) (SCM port);
off_t (*seek) (SCM port, off_t OFFSET, int WHENCE);
void (*truncate) (SCM port, off_t length);
scm_t_off (*seek) (SCM port, scm_t_off OFFSET, int WHENCE);
void (*truncate) (SCM port, scm_t_off length);
} scm_t_ptob_descriptor;
@ -224,12 +222,12 @@ SCM_API void scm_set_port_end_input (scm_t_bits tc,
void (*end_input) (SCM port,
int offset));
SCM_API void scm_set_port_seek (scm_t_bits tc,
off_t (*seek) (SCM port,
off_t OFFSET,
int WHENCE));
scm_t_off (*seek) (SCM port,
scm_t_off OFFSET,
int WHENCE));
SCM_API void scm_set_port_truncate (scm_t_bits tc,
void (*truncate) (SCM port,
off_t length));
scm_t_off length));
SCM_API void scm_set_port_input_waiting (scm_t_bits tc, int (*input_waiting) (SCM));
SCM_API SCM scm_char_ready_p (SCM port);
size_t scm_take_from_input_buffers (SCM port, char *dest, size_t read_len);

18
libguile/r6rs-ports.c
View file

@ -125,11 +125,11 @@ bip_fill_input (SCM port)
return result;
}
static off_t
bip_seek (SCM port, off_t offset, int whence)
static scm_t_off
bip_seek (SCM port, scm_t_off offset, int whence)
#define FUNC_NAME "bip_seek"
{
off_t c_result = 0;
scm_t_off c_result = 0;
scm_t_port *c_port = SCM_PTAB_ENTRY (port);
switch (whence)
@ -217,12 +217,12 @@ cbp_mark (SCM port)
return SCM_BOOL_F;
}
static off_t
cbp_seek (SCM port, off_t offset, int whence)
static scm_t_off
cbp_seek (SCM port, scm_t_off offset, int whence)
#define FUNC_NAME "cbp_seek"
{
SCM result;
off_t c_result = 0;
scm_t_off c_result = 0;
switch (whence)
{
@ -885,8 +885,8 @@ bop_write (SCM port, const void *data, size_t size)
buf->len = (buf->len > buf->pos) ? buf->len : buf->pos;
}
static off_t
bop_seek (SCM port, off_t offset, int whence)
static scm_t_off
bop_seek (SCM port, scm_t_off offset, int whence)
#define FUNC_NAME "bop_seek"
{
scm_t_bop_buffer *buf;
@ -895,7 +895,7 @@ bop_seek (SCM port, off_t offset, int whence)
switch (whence)
{
case SEEK_CUR:
offset += (off_t) buf->pos;
offset += (scm_t_off) buf->pos;
/* Fall through. */
case SEEK_SET:

6
libguile/rw.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 2001, 2006 Free Software Foundation, Inc.
/* Copyright (C) 2001, 2006, 2009 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@ -207,7 +207,7 @@ SCM_DEFINE (scm_write_string_partial, "write-string/partial", 1, 3, 0,
#define FUNC_NAME s_scm_write_string_partial
{
const char *src;
long write_len;
scm_t_off write_len;
int fdes;
{
@ -232,7 +232,7 @@ SCM_DEFINE (scm_write_string_partial, "write-string/partial", 1, 3, 0,
SCM port = (SCM_UNBNDP (port_or_fdes)?
scm_current_output_port () : port_or_fdes);
scm_t_port *pt;
off_t space;
scm_t_off space;
SCM_VALIDATE_OPFPORT (2, port);
SCM_VALIDATE_OUTPUT_PORT (2, port);

14
libguile/strports.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 1995,1996,1998,1999,2000,2001,2002, 2003, 2005, 2006 Free Software Foundation, Inc.
/* Copyright (C) 1995,1996,1998,1999,2000,2001,2002, 2003, 2005, 2006, 2009 Free Software Foundation, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
@ -108,7 +108,7 @@ stfill_buffer (SCM port)
/* change the size of a port's string to new_size. this doesn't
change read_buf_size. */
static void
st_resize_port (scm_t_port *pt, off_t new_size)
st_resize_port (scm_t_port *pt, scm_t_off new_size)
{
SCM old_stream = SCM_PACK (pt->stream);
const char *src = scm_i_string_chars (old_stream);
@ -118,7 +118,7 @@ st_resize_port (scm_t_port *pt, off_t new_size)
unsigned long int min_size = min (old_size, new_size);
unsigned long int i;
off_t index = pt->write_pos - pt->write_buf;
scm_t_off index = pt->write_pos - pt->write_buf;
pt->write_buf_size = new_size;
@ -199,11 +199,11 @@ st_end_input (SCM port, int offset)
pt->rw_active = SCM_PORT_NEITHER;
}
static off_t
st_seek (SCM port, off_t offset, int whence)
static scm_t_off
st_seek (SCM port, scm_t_off offset, int whence)
{
scm_t_port *pt = SCM_PTAB_ENTRY (port);
off_t target;
scm_t_off target;
if (pt->rw_active == SCM_PORT_READ && offset == 0 && whence == SEEK_CUR)
/* special case to avoid disturbing the unread-char buffer. */
@ -272,7 +272,7 @@ st_seek (SCM port, off_t offset, int whence)
}
static void
st_truncate (SCM port, off_t length)
st_truncate (SCM port, scm_t_off length)
{
scm_t_port *pt = SCM_PTAB_ENTRY (port);