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(scm_with_current_input_port, scm_with_current_output_port,

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scm_with_current_error_port): New.
This commit is contained in:
Marius Vollmer 2004-01-04 23:40:14 +00:00
parent b57a0953fe
commit 185e369a7f
2 changed files with 60 additions and 2 deletions
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57
libguile/ports.c
View file

@ -1,4 +1,4 @@
/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003 Free Software Foundation, Inc.
/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004 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
@ -31,6 +31,7 @@
#include "libguile/objects.h"
#include "libguile/smob.h"
#include "libguile/chars.h"
#include "libguile/dynwind.h"
#include "libguile/keywords.h"
#include "libguile/root.h"
@ -425,6 +426,60 @@ SCM_DEFINE (scm_set_current_error_port, "set-current-error-port", 1, 0, 0,
}
#undef FUNC_NAME
typedef struct {
SCM value;
SCM (*getter) (void);
SCM (*setter) (SCM);
} swap_data;
static void
swap_port (void *data)
{
swap_data *d = (swap_data *)data;
SCM t;
t = d->getter ();
d->setter (d->value);
d->value = t;
}
static void
scm_with_current_foo_port (SCM port,
SCM (*getter) (void), SCM (*setter) (SCM))
{
swap_data data;
data.value = port;
data.getter = getter;
data.setter = setter;
scm_on_rewind (swap_port, &data, SCM_F_WIND_EXPLICITELY);
scm_on_unwind (swap_port, &data, SCM_F_WIND_EXPLICITELY);
}
void
scm_with_current_input_port (SCM port)
{
scm_with_current_foo_port (port,
scm_current_input_port,
scm_set_current_input_port);
}
void
scm_with_current_output_port (SCM port)
{
scm_with_current_foo_port (port,
scm_current_output_port,
scm_set_current_output_port);
}
void
scm_with_current_error_port (SCM port)
{
scm_with_current_foo_port (port,
scm_current_error_port,
scm_set_current_error_port);
}
/* The port table --- an array of pointers to ports. */

5
libguile/ports.h
View file

@ -3,7 +3,7 @@
#ifndef SCM_PORTS_H
#define SCM_PORTS_H
/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003 Free Software Foundation, Inc.
/* Copyright (C) 1995,1996,1997,1998,1999,2000,2001, 2003, 2004 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
@ -235,6 +235,9 @@ SCM_API SCM scm_current_load_port (void);
SCM_API SCM scm_set_current_input_port (SCM port);
SCM_API SCM scm_set_current_output_port (SCM port);
SCM_API SCM scm_set_current_error_port (SCM port);
SCM_API void scm_with_current_input_port (SCM port);
SCM_API void scm_with_current_output_port (SCM port);
SCM_API void scm_with_current_error_port (SCM port);
SCM_API SCM scm_new_port_table_entry (scm_t_bits tag);
SCM_API void scm_remove_from_port_table (SCM port);
SCM_API void scm_grow_port_cbuf (SCM port, size_t requested);