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Avoid segfaults in 'bidi_mirror_char' during startup

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* src/bidi.c (bidi_mirror_char): Make sure 'bidi_mirror_table' is
initialized before accessing it.  (Bug#80668)
This commit is contained in:
Eli Zaretskii 2026-03-24 19:09:52 +02:00
parent 7b8a38e053
commit 70fae75629
1 changed files with 10 additions and 0 deletions
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10
src/bidi.c
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@ -367,6 +367,8 @@ bidi_isolate_fmt_char (bidi_type_t ch_type)
return (ch_type == LRI || ch_type == RLI || ch_type == PDI || ch_type == FSI);
}
static void bidi_initialize (void);
/* Return the mirrored character of C, if it has one. If C has no
mirrored counterpart, return C.
Note: The conditions in UAX#9 clause L4 regarding the surrounding
@ -381,6 +383,14 @@ bidi_mirror_char (int c)
if (c < 0 || c > MAX_CHAR)
emacs_abort ();
/* We can be called at the very beginning of init_iterator, via
produce_special_glyphs, and the first such call in a session might
happen when the bidi-mirroring table was not yet initialized. Make
sure we do this now. */
if (!CHAR_TABLE_P (bidi_mirror_table)
&& !bidi_initialized)
bidi_initialize ();
val = CHAR_TABLE_REF (bidi_mirror_table, c);
if (FIXNUMP (val))
{