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(uxnasm) Raise error when memory is overwritten.

This commit is contained in:
Andrew Alderwick 2022-02-19 00:27:28 +00:00
parent da4f0e70a5
commit 8b84813c6e
1 changed files with 5 additions and 0 deletions
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5
src/uxnasm.c
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@ -193,6 +193,10 @@ writebyte(Uint8 b)
fprintf(stderr, "-- Writing in zero-page: %02x\n", b); fprintf(stderr, "-- Writing in zero-page: %02x\n", b);
return 0; return 0;
} }
else if(p.ptr < p.length) {
fprintf(stderr, "-- Memory overwrite: %04x -> %04x\n", p.length, p.ptr);
return 0;
}
p.data[p.ptr++] = b; p.data[p.ptr++] = b;
p.length = p.ptr; p.length = p.ptr;
litlast = 0; litlast = 0;
@ -213,6 +217,7 @@ writelitbyte(Uint8 b)
if(litlast) { /* combine literals */ if(litlast) { /* combine literals */
Uint8 hb = p.data[p.ptr - 1]; Uint8 hb = p.data[p.ptr - 1];
p.ptr -= 2; p.ptr -= 2;
p.length = p.ptr;
return writeshort((hb << 8) + b, 1); return writeshort((hb << 8) + b, 1);
} }
if(!writebyte(findopcode("LIT"))) return 0; if(!writebyte(findopcode("LIT"))) return 0;