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From: | Juri Linkov |
Subject: | bug#13084: boyer_moore crashes with certain characters in the case table |
Date: | Wed, 05 Dec 2012 02:34:39 +0200 |
User-agent: | Gnus/5.13 (Gnus v5.13) Emacs/24.3.50 (x86_64-pc-linux-gnu) |
The minimal reproducible recipe for crashes in boyer_moore noticed in bug#13041: 1. emacs -Q 2. Eval in *scratch*: (let ((table (standard-case-table)) canon) (setq canon (copy-sequence table)) (aset canon #xff59 ?y) (set-char-table-extra-slot table 1 canon) (set-char-table-extra-slot table 2 nil) (set-standard-case-table table)) 3. Start an activity that includes a search, e.g. `C-x 8 RET TAB' The crash in boyer_moore is caused by fullwidth characters like #xff59 whose Unicode properties are: name: FULLWIDTH LATIN SMALL LETTER Y decomposition: (wide 121) (wide 'y') However, the crash doesn't occur when the same fullwidth characters are set to their downcase counterparts in lisp/international/characters.el: ;; Fullwidth Latin (setq c #xff21) (while (<= c #xff3a) (set-case-syntax-pair c (+ c #x20) tbl) (modify-category-entry c ?l) (modify-category-entry (+ c #x20) ?l) (setq c (1+ c)))
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