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Avoid assertion violations in 'char-syntax'

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* src/syntax.c (Fchar_syntax): Handle multibyte characters even if
the current buffer is unibyte.  Doc fix.  (Bug#81717)
This commit is contained in:
Eli Zaretskii 2026-08-29 19:19:08 +03:00
parent 8c18e3d4e8
commit b115e349e3
1 changed files with 6 additions and 1 deletions
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7
src/syntax.c
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@ -1102,6 +1102,10 @@ character `w' (119) is returned.
The characters that correspond to various syntax codes The characters that correspond to various syntax codes
are listed in the documentation of `modify-syntax-entry'. are listed in the documentation of `modify-syntax-entry'.
Caveat: if the current buffer is unibyte, this function interprets
values between 128 and 255 as raw bytes, and returns the syntax of
the correspoinding `eight-bit' character.
If you're trying to determine the syntax of characters in the buffer, If you're trying to determine the syntax of characters in the buffer,
this is probably the wrong function to use, because it can't take this is probably the wrong function to use, because it can't take
`syntax-table' text properties into account. Consider using `syntax-table' text properties into account. Consider using
@ -1111,7 +1115,8 @@ this is probably the wrong function to use, because it can't take
CHECK_CHARACTER (character); CHECK_CHARACTER (character);
int char_int = XFIXNAT (character); int char_int = XFIXNAT (character);
SETUP_BUFFER_SYNTAX_TABLE (); SETUP_BUFFER_SYNTAX_TABLE ();
if (NILP (BVAR (current_buffer, enable_multibyte_characters))) if (NILP (BVAR (current_buffer, enable_multibyte_characters))
&& SINGLE_BYTE_CHAR_P (char_int))
char_int = make_char_multibyte (char_int); char_int = make_char_multibyte (char_int);
return make_fixnum (syntax_code_spec[SYNTAX (char_int)]); return make_fixnum (syntax_code_spec[SYNTAX (char_int)]);
} }