hexl-mode doesn't seem to allow me to create a binary file.
1. Open Emacs
2. Create a new file using C-x C-f /tmp/boot-sect.bin
3. M-x hexl-mode
4. M-x hexl-insert-hex-char
5. e
6. Nothing is written into the buffer and the message buffer says "Point is not on a character file".
I took a brief look at the source code and it appears that (hexl-current-address) expected the cursor to not be in the top left (0,0) location of the buffer. Normally in hexl-mode those columns are going to be occupied by addresses. Yet, that's exactly where the cursor is because that's an empty file.
I tried on my two Macs and on a Linux box too.
It works as expected if I do "echo 0 > /tmp/boot-sect.bin" first so that the file isn't empty.
In GNU Emacs 27.1 (build 1, x86_64-apple-darwin18.7.0, NS appkit-1671.60 Version 10.14.6 (Build 18G95))
of 2020-08-11 built on
builder10-14.porkrind.orgWindowing system distributor 'Apple', version 10.3.1894
System Description: Mac OS X 10.15.6
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hexl-current-address: Point is not on a character in the file
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