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Avoid assertion violations in malformed Unicode escapes

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* src/lread.c (read_escape): Produce better diagnostic for
malformed \u Unicode escapes, while avoiding assertion violation
when READCHAR returns -1 because the input is exhausted.
(Bug#44084)
This commit is contained in:
Eli Zaretskii 2020-10-20 18:27:47 +03:00
parent 01e0357ba7
commit d3c3fe7814
1 changed files with 7 additions and 0 deletions
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7
src/lread.c
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@ -2573,6 +2573,13 @@ read_escape (Lisp_Object readcharfun, bool stringp)
while (++count <= unicode_hex_count)
{
c = READCHAR;
if (c < 0)
{
if (unicode_hex_count > 4)
error ("Malformed Unicode escape: \\U%x", i);
else
error ("Malformed Unicode escape: \\u%x", i);
}
/* `isdigit' and `isalpha' may be locale-specific, which we don't
want. */
int digit = char_hexdigit (c);