diff options
Diffstat (limited to 'bas.c')
| -rw-r--r-- | bas.c | 8 |
1 files changed, 6 insertions, 2 deletions
@@ -115,13 +115,17 @@ void parse_header(void) { vvstart = vvtp - TBL_OFFSET; code_end = starp - TBL_OFFSET; - if(lomem) die("This doesn't look like an Atari BASIC program (no $0000 signature)."); - if(filelen < code_end) { fprintf(stderr, "Warning: file is truncated: %d bytes, should be %d.\n", filelen, code_end); } if(verbose) dump_header_vars(); + + /* these checks are actually kind of conservative. */ + if(lomem) die("Not an Atari BASIC program (no $0000 signature)."); + if(vntp < 0x100) die("Not an Atari BASIC program (invalid VNTP)."); + if(vvtp < vntd) die("Not an Atari BASIC program (invalid VVTP)."); + if(starp < vvtp) die("Not an Atari BASIC program (invalid STARP)."); } void update_header(void) { |