john_maloney / SmallVM / issues / #422 - unicode error in Boardie — Bitbucket

Issue #422 resolved

Wenjie Wu created an issue 2023-09-16

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Connect esp32 board, works well

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this is the test project

Comments (8)

Wenjie Wu reporter
- edited description
- 2023-09-16T13:05:16+00:00
John Maloney repo owner
Thanks for reporting this. Will investigate.
- 2023-09-18T02:56:21+00:00
John Maloney repo owner
- changed status to open
- 2023-09-18T20:34:49+00:00
John Maloney repo owner
Found the problem. Fix will be in the next Pilot release.
- 2023-09-18T20:54:06+00:00
Wenjie Wu reporter
👍
- 2023-09-18T23:09:11+00:00
John Maloney repo owner
FYI, the underlying cause of this bug is an explicit ambiguity in the C language spec.

The C language does not specify whether an 8-bit char datatype is signed or unsigned; that choice is left up to the implementation. Thus, the C code for primUnicodeAt() had different behavior depending on whether it was compiled for a microcontroller or for Boardie.

I've been using C for decades but I did not know about this particular design flaw...
- 2023-09-19T10:46:22+00:00
Wenjie Wu reporter
Thanks for the explanation and your work on microblocks, we happily program the hardware bypassing C 😄
- 2023-09-25T00:17:03+00:00
Wenjie Wu reporter
- changed status to resolved
- 2023-09-25T00:17:20+00:00
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Assignee: –

Type: bug

Priority: major

Status: resolved

Votes: 0

Watchers: 1

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