/*
 *	aegis - project change supervisor
 *	Copyright (C) 1999, 2001 Peter Miller;
 *	All rights reserved.
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program; if not, write to the Free Software
 *	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
 *
 * MANIFEST: functions to manipulate memorys
 */

#include <ac/string.h>

#include <error.h>
#include <mem.h>
#include <output/memory.h>
#include <output/private.h>
#include <str.h>
#include <trace.h>


typedef struct output_memory_ty output_memory_ty;
struct output_memory_ty
{
	output_ty	inherited;
	unsigned char	*buffer;
	size_t		size;
	size_t		maximum;
};


static void output_memory_destructor _((output_ty *));

static void
output_memory_destructor(fp)
	output_ty	*fp;
{
	output_memory_ty *this;

	trace(("output_memory_destructor(fp = %08lX)\n{\n", (long)fp));
	this = (output_memory_ty *)fp;
	if (this->buffer)
		mem_free(this->buffer);
	trace(("}\n"));
}


static string_ty *output_memory_filename _((output_ty *));

static string_ty *
output_memory_filename(fp)
	output_ty	*fp;
{
	static string_ty *s;

	if (!s)
		s = str_from_c("memory");
	return s;
}


static long output_memory_ftell _((output_ty *));

static long
output_memory_ftell(fp)
	output_ty	*fp;
{
	output_memory_ty *this;

	this = (output_memory_ty *)fp;
	return this->size;
}


static void output_memory_write _((output_ty *, const void *, size_t));

static void
output_memory_write(fp, data, len)
	output_ty	*fp;
	const void	*data;
	size_t		len;
{
	output_memory_ty *this;

	trace(("output_memory_write(fp = %08lX, data = %08lX, len = %ld)\n{\n",
		(long)fp, (long)data, (long)len));
	this = (output_memory_ty *)fp;
	while (this->size + len > this->maximum)
	{
		this->maximum = 2 * this->maximum + 32;
		this->buffer = mem_change_size(this->buffer, this->maximum);
	}
	memcpy(this->buffer + this->size, data, len);
	this->size += len;
	trace(("}\n"));
}


static void output_memory_eoln _((output_ty *));

static void
output_memory_eoln(fp)
	output_ty	*fp;
{
	output_memory_ty *this;

	trace(("output_memory_eol(fp = %08lX)\n{\n", (long)fp));
	this = (output_memory_ty *)fp;
	if (this->size && this->buffer[this->size - 1] != '\n')
		output_fputc(fp, '\n');
	trace(("}\n"));
}


static output_vtbl_ty vtbl =
{
	sizeof(output_memory_ty),
	output_memory_destructor,
	output_memory_filename,
	output_memory_ftell,
	output_memory_write,
	output_generic_flush,
	output_generic_page_width,
	output_generic_page_length,
	output_memory_eoln,
	"memory",
};


output_ty *
output_memory_open()
{
	output_ty	*result;
	output_memory_ty *this;

	trace(("output_memory_open()\n{\n"));
	result = output_new(&vtbl);
	this = (output_memory_ty *)result;
	this->buffer = 0;
	this->size = 0;
	this->maximum = 0;
	trace(("return %08lX\n", (long)this));
	trace(("}\n"));
	return result;
}


void
output_memory_forward(fp, deeper)
	output_ty	*fp;
	output_ty	*deeper;
{
	output_memory_ty *this;

	trace(("output_memory_forward(fp = %08lX, deeper = %08lX)\n{\n",
		(long)fp, (long)deeper));
	output_flush(fp);
	assert(fp->vptr == &vtbl);
	if (fp->vptr == &vtbl)
	{
		this = (output_memory_ty *)fp;
		if (this->size)
			output_write(deeper, this->buffer, this->size);
		else
			error_raw("%s: %d: nothing to forward", __FILE__, __LINE__);
	}
	trace(("}\n"));
}