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/*
casm - Simple, portable assembler
Copyright (C) 2003-2015 Ian Cowburn (ianc@noddybox.demon.co.uk)
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 3 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, see <http://www.gnu.org/licenses/>.
-------------------------------------------------------------------------
Commodore T64 tape output handler.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "global.h"
#include "codepage.h"
#include "t64out.h"
/* ---------------------------------------- MACROS & TYPES
*/
#define NOT_USED 0
/* ---------------------------------------- PRIVATE FUNCTIONS
*/
static int PokeB(Byte *mem, int addr, Byte b)
{
mem[addr++] = b;
return (addr % 0x10000);
}
static int PokeW(Byte *mem, int addr, int w)
{
addr = PokeB(mem, addr, w & 0xff);
return PokeB(mem, addr, (w & 0xff00) >> 8);
}
static int PokeS(Byte *mem, int addr, const char *str)
{
while(*str)
{
addr = PokeB(mem, addr, CodeFromNative(CP_CBM, *str++));
}
return addr;
}
static void WriteByte(FILE *fp, Byte b)
{
putc(b, fp);
}
static void WriteWord(FILE *fp, int w)
{
WriteByte(fp, w & 0xff);
WriteByte(fp, (w & 0xff00) >> 8);
}
static void WriteLong(FILE *fp, unsigned long l)
{
int f;
for(f = 0; f < 4; f++)
{
WriteByte(fp, l & 0xff);
l >>= 8u;
}
}
static void WriteString(FILE *fp, const char *p, int len,
Byte fill, Codepage cp)
{
while(len--)
{
WriteByte(fp, *p ? CodeFromNative(cp, *p++) : CodeFromNative(cp, fill));
}
}
/* ---------------------------------------- INTERFACES
*/
const ValueTable *T64OutputOptions(void)
{
return NULL;
}
CommandStatus T64OutputSetOption(int opt, int argc, char *argv[],
int quoted[],
char *error, size_t error_size)
{
return CMD_NOT_KNOWN;
}
int T64Output(const char *filename, const char *filename_bank,
MemoryBank **bank, int count, char *error, size_t error_size)
{
FILE *fp = fopen(filename, "wb");
int f;
int offset;
if (!fp)
{
snprintf(error, error_size, "Failed to create %s", filename);
return FALSE;
}
/* Write signature
*/
WriteString(fp, "C64 tape image file", 32, 0, CP_ASCII);
/* Write directory header
*/
WriteWord(fp, 0x200);
WriteWord(fp, count);
WriteWord(fp, count);
WriteWord(fp, NOT_USED);
WriteString(fp, filename, 24, ' ', CP_ASCII);
/* Offset to tape data
*/
offset = 64 + 32 * count;
/* Write directory entries
*/
for(f = 0; f < count; f++)
{
int min, max, len;
min = bank[f]->min_address_used;
max = bank[f]->max_address_used;
/* If this is the first bank, we're going to prepend some BASIC
*/
if (f == 0)
{
if (min < 0x810)
{
snprintf(error, error_size, "First bank starts below a safe "
"area to add BASIC loader");
return FALSE;
}
min = 0x801; /* Start of BASIC */
}
len = max - min + 1;
WriteByte(fp, 1);
WriteByte(fp, 0x82);
WriteWord(fp, min);
WriteWord(fp, max + 1);
WriteWord(fp, NOT_USED);
WriteLong(fp, offset);
WriteWord(fp, NOT_USED);
WriteWord(fp, NOT_USED);
if (count == 1)
{
WriteString(fp, filename, 16, ' ', CP_CBM);
}
else
{
char fn[16];
snprintf(fn, sizeof fn, filename_bank, bank[f]->number);
WriteString(fp, fn, 16, ' ', CP_CBM);
}
/* +2 is to include the 2-byte PRG header
offset += len + 2;
*/
offset += len;
}
/* Write actual contents
*/
for(f = 0; f < count; f++)
{
Byte *mem;
int min, max, len;
mem = bank[f]->memory;
min = bank[f]->min_address_used;
max = bank[f]->max_address_used;
/* If this is the first bank, we're going to prepend some BASIC.
Note that output drivers are allowed to manipulate memory directly.
*/
if (f == 0)
{
char sys[16];
int a = 0x803;
int next;
snprintf(sys, sizeof sys, "%u", min);
a = PokeW(mem, a, 10);
a = PokeB(mem, a, 0x9e);
a = PokeS(mem, a, sys);
a = PokeB(mem, a, 0x00);
next = a;
a = PokeW(mem, a, 0x00);
PokeW(mem, 0x801, next);
min = 0x801;
}
len = max - min + 1;
fwrite(mem + min, len, 1, fp);
}
fclose(fp);
return TRUE;
}
/*
vim: ai sw=4 ts=8 expandtab
*/
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