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dmolony-DiskBrowser
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debug for CP/M basic

This commit is contained in:
Denis Molony 2021-07-27 17:55:19 +10:00
parent f02c932d91
commit 0e40e25710
1 changed files with 69 additions and 5 deletions
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74
src/com/bytezone/diskbrowser/applefile/CPMBasicFile.java
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@ -5,7 +5,7 @@ import static com.bytezone.diskbrowser.utilities.Utility.getShort;
import com.bytezone.diskbrowser.utilities.HexFormatter;
// -----------------------------------------------------------------------------------//
public class CPMBasicFile extends TextFile
public class CPMBasicFile extends BasicProgram
// -----------------------------------------------------------------------------------//
{
String[] tokens = { //
@ -52,7 +52,7 @@ public class CPMBasicFile extends TextFile
{
StringBuilder text = new StringBuilder ();
if (textPreferences.showHeader)
if (basicPreferences.showHeader)
text.append ("Name : " + name + "\n\n");
int ptr = 5;
@ -60,6 +60,11 @@ public class CPMBasicFile extends TextFile
ptr++;
int loadAddress = getShort (buffer, 1) - ptr - 1;
if (!validate (buffer, loadAddress))
System.out.println ("Invalid load address");
if (showDebugText)
return debugText (loadAddress);
ptr = 1;
while (ptr < buffer.length)
@ -83,10 +88,10 @@ public class CPMBasicFile extends TextFile
{
if (val == 0xFF)
{
int next = buffer[ptr++] & 0xFF;
String token = functions[next & 0x7F];
val = buffer[ptr++] & 0xFF;
String token = functions[val & 0x7F];
if (token.length () == 0)
token = String.format ("<FF %02X>", next);
token = String.format ("<FF %02X>", val);
text.append (token);
}
else
@ -108,6 +113,10 @@ public class CPMBasicFile extends TextFile
text.append ("'");
ptr += 2;
}
else if (val == 0x3A && ptr < buffer.length && buffer[ptr] == (byte) 0x9E)
{
// ignore colon before ELSE
}
else
text.append (String.format ("%s", (char) val));
continue;
@ -180,4 +189,59 @@ public class CPMBasicFile extends TextFile
return text.toString ();
}
// ---------------------------------------------------------------------------------//
private String debugText (int loadAddress)
// ---------------------------------------------------------------------------------//
{
StringBuilder text = new StringBuilder ();
int ptr = 1;
int lastPtr;
while (ptr < buffer.length)
{
int nextAddress = getShort (buffer, ptr);
if (nextAddress == 0)
break;
int lineNumber = getShort (buffer, ptr + 2);
text.append (String.format (" %d ", lineNumber));
lastPtr = ptr;
ptr = nextAddress - loadAddress;
text.append (HexFormatter.getHexString (buffer, lastPtr + 4, ptr - lastPtr));
text.append ("\n");
if (ptr < 0 || ptr >= buffer.length)
break;
if (buffer[ptr - 1] != 0) // end of previous line
break;
}
return text.toString ();
}
// ---------------------------------------------------------------------------------//
private boolean validate (byte[] buffer, int loadAddress)
// ---------------------------------------------------------------------------------//
{
// System.out.printf ("Load Address: %04X%n", loadAddress);
int ptr = 1;
while (ptr < buffer.length)
{
int nextAddress = getShort (buffer, ptr);
// System.out.printf ("%04X%n", nextAddress);
if (nextAddress == 0)
return true;
ptr = nextAddress - loadAddress;
if (ptr < 0 || ptr >= buffer.length)
return false;
if (buffer[ptr - 1] != 0) // end of previous line
return false;
}
return false;
}
}