When creating a VICE label file, replace characters in labels that VICE

doesn't understand with '_'. Fixes #836.

src/ld65/dbgsyms.c

@@ -532,7 +532,7 @@ void PrintDbgSymLabels (FILE* F)
             if (GetDbgSym (D, Val) == 0) {
 
                 /* Emit the VICE label line */
-                fprintf (F, "al %06lX .%s\n", Val, GetString (D->Name));
+                PrintLabelLine (F, D->Name, Val);
 
                 /* Insert the symbol into the table */
                 InsertDbgSym (D, Val);

src/ld65/exports.c

@@ -39,6 +39,7 @@
 
 /* common */
 #include "addrsize.h"
+#include "chartype.h"
 #include "check.h"
 #include "hashfunc.h"
 #include "lidefs.h"
@@ -1006,6 +1007,36 @@ void PrintImportMap (FILE* F)
 
 
 
+void PrintLabelLine (FILE* F, unsigned NameId, long Val)
+/* Output one label into a vice label file doing some cleanup on the name. */
+{
+    /* Get the name */
+    const char* N = GetString (NameId);
+
+    /* Cleanup the name. It might be generated by the assembler when creating
+    ** internally used labels. Such names contain invalid characters to avoid
+    ** clashes with user input and cannot be read by VICE.
+    */
+    fprintf (F, "al %06lX .", Val);
+    if (IsAlpha (*N) || *N == '@' || *N == '?' || *N == '_') {
+        putc (*N, F);
+    } else {
+        putc ('_', F);
+    }
+    ++N;
+    while (*N) {
+        if (IsAlpha (*N) || IsDigit (*N) || *N == '_') {
+            putc (*N, F);
+        } else {
+            putc ('_', F);
+        }
+        ++N;
+    }
+    putc ('\n', F);
+}
+
+
+
 void PrintExportLabels (FILE* F)
 /* Print the exports in a VICE label file */
 {
@@ -1014,7 +1045,8 @@ void PrintExportLabels (FILE* F)
     /* Print all exports */
     for (I = 0; I < ExpCount; ++I) {
         const Export* E = ExpPool [I];
-        fprintf (F, "al %06lX .%s\n", GetExportVal (E), GetString (E->Name));
+        PrintLabelLine (F, E->Name, GetExportVal (E));
+
     }
 }
 

src/ld65/exports.h

@@ -195,6 +195,9 @@ void PrintExportMapByValue (FILE* F);
 void PrintImportMap (FILE* F);
 /* Print an import map to the given file */
 
+void PrintLabelLine (FILE* F, unsigned NameId, long Val);
+/* Output one label into a vice label file doing some cleanup on the name. */
+
 void PrintExportLabels (FILE* F);
 /* Print the exports in a VICE label file */