Subj : src/sbbs3/ansi_parser.cpp ansi_parser.h ansi_parser_test.cpp
To   : Git commit to main/sbbs/master
From : Rob Swindell (on Debian Linux)
Date : Thu Sep 24 2026 21:22:49

https://gitlab.synchro.net/main/sbbs/-/commit/2cbb0c02efb8a0cc02e14d6e
Modified Files:
	src/sbbs3/ansi_parser.cpp ansi_parser.h ansi_parser_test.cpp
Log Message:
ANSI_Parser: cap CSI parameters and intermediate bytes

ansi_sequence was already limited to max_sequence_len (1024) bytes, but
ansi_params and ansi_ibs grew without limit. The terminal output path
parses every byte sent to the user, and handle_SGR_sequence() calls
get_pval() once per parameter, each call copying and rescanning the whole
parameter string: cubic in the sequence length. A single 40 KB SGR
sequence in a message took about 53 seconds of CPU to display, per reader.

Parameter and intermediate bytes past the cap are now dropped and the
sequence completes normally. It isn't treated as broken, because putmsg()
prints the rest of a broken sequence as text. The filters putmsg() applies
look only at the final byte, the first parameter byte, exact intermediate
strings and the start of ansi_sequence, so truncation doesn't change what
it strips.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
--- SBBSecho 3.37-Linux
 * Origin: Vertrauen - [vert/cvs/bbs].synchro.net (1:103/705)

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