https://gitlab.synchro.net/main/sbbs/-/commit/16d0248e3cc9fa1e833acdf0
Modified Files:
docs/v322_new.md src/sbbs3/con_hi.cpp getstr.cpp writemsg.cpp
Log Message:
Accept Unicode (UTF-8) text in the internal message editor

On a UTF-8 terminal, the internal editor translated every typed
character to CP437 and dropped any with no CP437 equivalent (e.g.
"¨", "¨", "¨"), because its getstr() calls lacked K_UTF8. The subject
prompt has passed K_UTF8 since f68a24d61b (registry-20-rail,
2024-02-20), so a subject could hold emoji while the body could not.

getstr() now handles multi-byte UTF-8 input as characters: the bytes
of a sequence are collected per keystroke, byte-offsets and display
columns are tracked separately (via str_width/prev_char/next_char),
and all editing operations (word-wrap, insert/overwrite, backspace,
delete, Ctrl-W/Ctrl-D, Home/End, cursor keys, tab stops, centering)
work on characters and columns. The line-length limit remains a byte
limit (the caller's buffer size) while the wrap point is the terminal
width in columns. Edits go through two shared routines (insert_bytes/ delete_range) that print the same screen state as before for CP437
input.

redrwstr() moved to getstr.cpp (its only caller) and takes byte
offsets for both the cursor position and the length, converting to
columns itself. It previously compared a column count against a byte
count and so, after a multi-byte character was typed into a K_UTF8
field (e.g. an emoji in a subject), moved the cursor back to the start
of the field; text typed next overwrote the character on screen.

A CP437-translated high-bit character (e.g. "­") typed on a UTF-8
terminal was stored but never echoed, since the echo branch required
the buffer to be valid UTF-8. It is now echoed via outchar(), which
performs the CP437 to UTF-8 translation.

The editor's per-line byte budget (MAX_LINE_LEN) grows from cols+1 to (cols-1)*UTF8_MAX_LEN+3 to hold multi-byte lines. The old value also
left no room for the CR/LF of a full-width line: a 79-column line on
an 80-column terminal lost its LF when the lines were rejoined.

The "Export ASCII Characters Only" sub-board setting is an export-time conversion and does not restrict local input.

Fixes #1317

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
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