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/*===========================================================================
* Filename : scmport-str.c
* About : A ScmBytePort implementation for string
*
* Copyright (C) 2005-2006 YAMAMOTO Kengo <yamaken AT bp.iij4u.or.jp>
* Copyright (c) 2007-2008 SigScheme Project <uim-en AT googlegroups.com>
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of authors nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS
* IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
===========================================================================*/
/*
* - This file is intended to be portable. Don't depend on SigScheme.
* - To isolate and hide implementation-dependent things, don't merge this file
* into another
*/
#include <config.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "scmint.h"
#include "scmport-config.h"
#include "scmport.h"
#include "scmport-str.h"
/*=======================================
File Local Macro Definitions
=======================================*/
/*=======================================
File Local Type Definitions
=======================================*/
typedef struct ScmInputStrPort_ ScmInputStrPort;
typedef struct ScmOutputStrPort_ ScmOutputStrPort;
struct ScmInputStrPort_ { /* inherits ScmBytePort */
const ScmBytePortVTbl *vptr;
scm_byte_t *str;
const scm_byte_t *cur;
scm_bool has_str_ownership;
void *opaque; /* client-specific opaque information */
ScmInputStrPort_finalizer finalize;
};
struct ScmOutputStrPort_ { /* inherits ScmBytePort */
const ScmBytePortVTbl *vptr;
scm_byte_t *str;
size_t cur; /* offset to terminal '\0' */
size_t buf_size;
void *opaque; /* client-specific opaque information */
ScmOutputStrPort_finalizer finalize;
};
/*=======================================
File Local Function Declarations
=======================================*/
/* input port */
static ScmBytePort *istrport_new(scm_byte_t *str, scm_bool ownership,
ScmInputStrPort_finalizer finalize);
static void istrport_finalize(char **str, scm_bool ownership, void **opaque);
static ScmBytePort *istrport_dyn_cast(ScmBytePort *bport,
const ScmBytePortVTbl *dest_vptr);
static void istrport_close(ScmInputStrPort *port);
static char *istrport_inspect(ScmInputStrPort *port);
static scm_ichar_t istrport_get_byte(ScmInputStrPort *port);
static scm_ichar_t istrport_peek_byte(ScmInputStrPort *port);
static scm_bool istrport_byte_readyp(ScmInputStrPort *port);
static void istrport_puts(ScmInputStrPort *port, const char *str);
static void istrport_write(ScmInputStrPort *port,
size_t nbytes, const char *buf);
static void istrport_flush(ScmInputStrPort *port);
/* output port */
static void ostrport_finalize(char **str, size_t buf_size, void **opaque);
static ScmBytePort *ostrport_dyn_cast(ScmBytePort *bport,
const ScmBytePortVTbl *dest_vptr);
static void ostrport_close(ScmOutputStrPort *port);
static char *ostrport_inspect(ScmOutputStrPort *port);
static scm_ichar_t ostrport_get_byte(ScmOutputStrPort *port);
static scm_ichar_t ostrport_peek_byte(ScmOutputStrPort *port);
static scm_bool ostrport_byte_readyp(ScmOutputStrPort *port);
static void ostrport_puts(ScmOutputStrPort *port, const char *str);
static void ostrport_write(ScmOutputStrPort *port,
size_t nbytes, const char *buf);
static void ostrport_flush(ScmOutputStrPort *port);
static void ostrport_append(ScmOutputStrPort *port,
size_t len, const scm_byte_t *str);
/*=======================================
Variable Definitions
=======================================*/
static const ScmBytePortVTbl ScmInputStrPort_vtbl = {
(ScmBytePortMethod_dyn_cast) &istrport_dyn_cast,
(ScmBytePortMethod_close) &istrport_close,
(ScmBytePortMethod_inspect) &istrport_inspect,
(ScmBytePortMethod_get_byte) &istrport_get_byte,
(ScmBytePortMethod_peek_byte) &istrport_peek_byte,
(ScmBytePortMethod_byte_readyp)&istrport_byte_readyp,
(ScmBytePortMethod_puts) &istrport_puts,
(ScmBytePortMethod_write) &istrport_write,
(ScmBytePortMethod_flush) &istrport_flush
};
SCM_EXPORT const ScmBytePortVTbl *const ScmInputStrPort_vptr
= &ScmInputStrPort_vtbl;
static const ScmBytePortVTbl ScmOutputStrPort_vtbl = {
(ScmBytePortMethod_dyn_cast) &ostrport_dyn_cast,
(ScmBytePortMethod_close) &ostrport_close,
(ScmBytePortMethod_inspect) &ostrport_inspect,
(ScmBytePortMethod_get_byte) &ostrport_get_byte,
(ScmBytePortMethod_peek_byte) &ostrport_peek_byte,
(ScmBytePortMethod_byte_readyp)&ostrport_byte_readyp,
(ScmBytePortMethod_puts) &ostrport_puts,
(ScmBytePortMethod_write) &ostrport_write,
(ScmBytePortMethod_flush) &ostrport_flush
};
SCM_EXPORT const ScmBytePortVTbl *const ScmOutputStrPort_vptr
= &ScmOutputStrPort_vtbl;
/*=======================================
Function Definitions
=======================================*/
/*
* Client code must call this first even if current implementation does not
* contain actual code.
*/
SCM_EXPORT void
scm_strport_init(void)
{
}
static ScmBytePort *
istrport_new(scm_byte_t *str, scm_bool ownership,
ScmInputStrPort_finalizer finalize)
{
ScmInputStrPort *port;
SCM_PORT_ASSERT(str);
port = SCM_PORT_MALLOC(sizeof(ScmInputStrPort));
port->vptr = ScmInputStrPort_vptr;
port->cur = port->str = str;
port->has_str_ownership = ownership;
port->opaque = NULL;
port->finalize = (finalize) ? finalize : &istrport_finalize;
return (ScmBytePort *)port;
}
SCM_EXPORT ScmBytePort *
ScmInputStrPort_new(char *str, ScmInputStrPort_finalizer finalize)
{
return istrport_new((scm_byte_t *)str, scm_true, finalize);
}
SCM_EXPORT ScmBytePort *
ScmInputStrPort_new_copying(const char *str,
ScmInputStrPort_finalizer finalize)
{
return istrport_new((scm_byte_t *)SCM_PORT_STRDUP(str),
scm_true, finalize);
}
SCM_EXPORT ScmBytePort *
ScmInputStrPort_new_const(const char *str, ScmInputStrPort_finalizer finalize)
{
/* str is actually treated as const */
return istrport_new((scm_byte_t *)str, scm_false, finalize);
}
SCM_EXPORT void **
ScmInputStrPort_ref_opaque(ScmBytePort *bport)
{
ScmInputStrPort *port;
port = SCM_BYTEPORT_DYNAMIC_CAST(ScmInputStrPort, bport);
return &port->opaque;
}
static ScmBytePort *
istrport_dyn_cast(ScmBytePort *bport, const ScmBytePortVTbl *dst_vptr)
{
return (dst_vptr == ScmInputStrPort_vptr) ? bport : NULL;
}
/* default finalizer */
static void
istrport_finalize(char **str, scm_bool ownership, void **opaque)
{
if (ownership)
free(*str);
}
static void
istrport_close(ScmInputStrPort *port)
{
SCM_PORT_ASSERT(port->finalize);
/* To suppress the "dereferencing type-punned pointer will break
* strict-aliasing rules" warning on gcc, apply a reinterpret_cast
* here. This operation is safe on the case. -- YamaKen 2007-01-06 */
(*port->finalize)((char **)(uintptr_t)&port->str,
port->has_str_ownership, &port->opaque);
free(port);
}
static char *
istrport_inspect(ScmInputStrPort *port)
{
return SCM_PORT_STRDUP("string");
}
static scm_ichar_t
istrport_get_byte(ScmInputStrPort *port)
{
return (*port->cur) ? *port->cur++ : SCM_ICHAR_EOF;
}
static scm_ichar_t
istrport_peek_byte(ScmInputStrPort *port)
{
return (*port->cur) ? *port->cur : SCM_ICHAR_EOF;
}
static scm_bool
istrport_byte_readyp(ScmInputStrPort *port)
{
return scm_true;
}
static void
istrport_puts(ScmInputStrPort *port, const char *str)
{
SCM_PORT_ERROR_INVALID_OPERATION(BYTE, port, ScmInputStrPort);
/* NOTREACHED */
}
static void
istrport_write(ScmInputStrPort *port, size_t nbytes, const char *buf)
{
SCM_PORT_ERROR_INVALID_OPERATION(BYTE, port, ScmInputStrPort);
/* NOTREACHED */
}
static void
istrport_flush(ScmInputStrPort *port)
{
SCM_PORT_ERROR_INVALID_OPERATION(BYTE, port, ScmInputStrPort);
/* NOTREACHED */
}
SCM_EXPORT ScmBytePort *
ScmOutputStrPort_new(ScmOutputStrPort_finalizer finalize)
{
ScmOutputStrPort *port;
port = SCM_PORT_MALLOC(sizeof(ScmOutputStrPort));
port->vptr = ScmOutputStrPort_vptr;
port->str = NULL;
port->cur = 0;
port->buf_size = 0;
port->opaque = NULL;
port->finalize = (finalize) ? finalize : &ostrport_finalize;
return (ScmBytePort *)port;
}
SCM_EXPORT const char *
ScmOutputStrPort_str(ScmBytePort *bport)
{
ScmOutputStrPort *port;
port = SCM_BYTEPORT_DYNAMIC_CAST(ScmOutputStrPort, bport);
return (port->str) ? (const char *)port->str : "";
}
SCM_EXPORT size_t
ScmOutputStrPort_c_strlen(ScmBytePort *bport)
{
ScmOutputStrPort *port;
port = SCM_BYTEPORT_DYNAMIC_CAST(ScmOutputStrPort, bport);
return (port->buf_size) ? port->buf_size - sizeof("") : 0;
}
SCM_EXPORT void **
ScmOutputStrPort_ref_opaque(ScmBytePort *bport)
{
ScmOutputStrPort *port;
port = SCM_BYTEPORT_DYNAMIC_CAST(ScmOutputStrPort, bport);
return &port->opaque;
}
static ScmBytePort *
ostrport_dyn_cast(ScmBytePort *bport, const ScmBytePortVTbl *dst_vptr)
{
return (dst_vptr == ScmOutputStrPort_vptr) ? bport : NULL;
}
static void
ostrport_finalize(char **str, size_t buf_size, void **opaque)
{
free(*str);
}
static void
ostrport_close(ScmOutputStrPort *port)
{
SCM_PORT_ASSERT(port->finalize);
/* To suppress the "dereferencing type-punned pointer will break
* strict-aliasing rules" warning on gcc, apply a reinterpret_cast
* here. This operation is safe on the case. -- YamaKen 2007-01-06 */
(*port->finalize)((char **)(uintptr_t)&port->str,
port->buf_size, &port->opaque);
free(port);
}
static char *
ostrport_inspect(ScmOutputStrPort *port)
{
return SCM_PORT_STRDUP("string");
}
static scm_ichar_t
ostrport_get_byte(ScmOutputStrPort *port)
{
SCM_PORT_ERROR_INVALID_OPERATION(BYTE, port, ScmOutputStrPort);
/* NOTREACHED */
}
static scm_ichar_t
ostrport_peek_byte(ScmOutputStrPort *port)
{
SCM_PORT_ERROR_INVALID_OPERATION(BYTE, port, ScmOutputStrPort);
/* NOTREACHED */
}
static scm_bool
ostrport_byte_readyp(ScmOutputStrPort *port)
{
SCM_PORT_ERROR_INVALID_OPERATION(BYTE, port, ScmOutputStrPort);
/* NOTREACHED */
}
static void
ostrport_puts(ScmOutputStrPort *port, const char *str)
{
ostrport_append(port, strlen(str), (const scm_byte_t *)str);
}
static void
ostrport_write(ScmOutputStrPort *port, size_t nbytes, const char *buf)
{
ostrport_append(port, nbytes, (const scm_byte_t *)buf);
}
static void
ostrport_flush(ScmOutputStrPort *port)
{
}
static void
ostrport_append(ScmOutputStrPort *port, size_t len, const scm_byte_t *str)
{
SCM_PORT_ASSERT(str);
/* extend the buffer */
if (port->buf_size - port->cur < len + sizeof("")) {
if (!port->buf_size)
port->buf_size = sizeof("");
port->buf_size += len;
port->str = SCM_PORT_REALLOC(port->str, port->buf_size);
}
memcpy(port->str + port->cur, str, len);
port->cur += len;
port->str[port->cur] = '\0';
}
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