Started adding CBM tape file support. Still the bulk of it to do, butHEADmaster

framework is there.

1 files changed, 282 insertions, 0 deletions

diff --git a/src/cbmtapout.c b/src/cbmtapout.c
new file mode 100644
index 0000000..b220794
--- /dev/null
+++ b/src/cbmtapout.c
@@ -0,0 +1,282 @@
+/*
+
+    casm - Simple, portable assembler
+
+    Copyright (C) 2003-2024  Ian Cowburn (ianc@noddybox.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 TAP output handler.
+
+*/
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#include "global.h"
+#include "codepage.h"
+#include "cbmtapout.h"
+#include "expr.h"
+
+
+/* ---------------------------------------- MACROS & TYPES
+*/
+
+/* ---------------------------------------- PRIVATE TYPES AND VARS
+*/
+enum option_t
+{
+    OPT_START_ADDR,
+    OPT_SYSTEM_TYPE
+};
+
+static const ValueTable option_set[]=
+{
+    {"cbm-tap-start", OPT_START_ADDR},
+    {"cbm-tap-system", OPT_SYSTEM_TYPE},
+    {NULL}
+};
+
+typedef enum
+{
+    SYS_C64,
+    SYS_VIC20,
+    SYS_VIC20_8K
+} system_t;
+
+static ValueTable system_table[]=
+{
+    {"c64",     SYS_C64},
+    {"vic20",   SYS_VIC20},
+    {"vic20+8k",SYS_VIC20_8K},
+    {NULL}
+};
+
+typedef struct
+{
+    int		start_addr;
+    system_t    system;
+} Options;
+
+static Options options =
+{
+    -1,
+    SYS_C64
+};
+
+
+/* ---------------------------------------- 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 WriteLongWord(FILE *fp, unsigned long l)
+{
+    WriteByte(fp, l & 0xfflu);
+    WriteByte(fp, (l & 0xff00lu) >> 8);
+    WriteByte(fp, (l & 0xff0000lu) >> 16);
+    WriteByte(fp, (l & 0xff000000lu) >> 24);
+}
+
+static void WriteASCII(FILE *fp, const char *str)
+{
+    while(*str)
+    {
+        WriteByte(fp, CodeFromNative(CP_ASCII, *str++));
+    }
+}
+
+
+/* ---------------------------------------- INTERFACES
+*/
+const ValueTable *CBMTAPOutputOptions(void)
+{
+    return option_set;
+}
+
+CommandStatus CBMTAPOutputSetOption(int opt, int argc, char *argv[],
+                                    int quoted[], char *err, size_t errsize)
+{
+    const ValueTable *val;
+    CommandStatus stat = CMD_OK;
+
+    CMD_ARGC_CHECK(1);
+
+    switch(opt)
+    {
+        case OPT_START_ADDR:
+            CMD_EXPR(argv[0], options.start_addr);
+            break;
+
+        case OPT_SYSTEM_TYPE:
+            CMD_TABLE(argv[0], system_table, val);
+            options.system = val->value;
+            break;
+
+        default:
+            break;
+    }
+
+    return stat;
+}
+
+int CBMTAPOutput(const char *filename, const char *filename_bank,
+                 MemoryBank **bank, int count, char *error, size_t error_size)
+{
+    int f;
+
+    for(f = 0; f < count; f++)
+    {
+        FILE *fp;
+        char buff[4096];
+        const char *name;
+        Byte *mem;
+        int min, max;
+        unsigned long len;
+        char sys[16];
+        int addr;
+        int start_addr;
+        int next;
+        int i;
+
+        if (count == 1)
+        {
+            name = filename;
+        }
+        else
+        {
+            snprintf(buff, sizeof buff, filename_bank, bank[f]->number);
+            name = buff;
+        }
+
+        if (!(fp = fopen(name, "wb")))
+        {
+            snprintf(error, error_size, "Failed to open %s", name);
+            return FALSE;
+        }
+
+        switch(options.system)
+        {
+            case SYS_C64:
+                addr = 0x803;
+                start_addr = 0x801;
+                break;
+            case SYS_VIC20:
+                addr = 0x1003;
+                start_addr = 0x1001;
+                break;
+            case SYS_VIC20_8K:
+                addr = 0x1203;
+                start_addr = 0x1201;
+                break;
+        }
+
+        mem = bank[f]->memory;
+        min = bank[f]->min_address_used;
+        max = bank[f]->max_address_used;
+
+        if (min < (addr + 0x10))
+        {
+            snprintf(error, error_size, "Bank starts below a safe "
+                                        "area to add BASIC loader");
+
+            return FALSE;
+        }
+
+        /* We're going to prepend some BASIC
+        */
+        if (options.start_addr == -1)
+        {
+            snprintf(sys, sizeof sys, "%d", bank[f]->min_address_used);
+        }
+        else
+        {
+            snprintf(sys, sizeof sys, "%d", options.start_addr);
+        }
+
+        addr = PokeW(mem, addr, 10);
+        addr = PokeB(mem, addr, 0x9e);
+        addr = PokeS(mem, addr, sys);
+        addr = PokeB(mem, addr, 0x00);
+
+        next = addr;
+
+        addr = PokeW(mem, addr, 0x00);
+
+        PokeW(mem, start_addr, next);
+
+        min = start_addr;        /* Start of BASIC */
+
+        len = max - min + 1;
+
+        /* Write out TAP file header
+        */
+        WriteASCII(fp, "C64-TAPE-RAW");
+        WriteByte(fp, 0);
+        WriteByte(fp, 0);
+        WriteByte(fp, 0);
+        WriteByte(fp, 0);
+        WriteLongWord(fp, len);
+
+        /* Output file data
+        */
+        fwrite(mem + min, len, 1, fp);
+
+        fclose(fp);
+    }
+
+    return TRUE;
+}
+
+
+/*
+vim: ai sw=4 ts=8 expandtab
+*/