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Avoid crashes when a fontset has strange entries

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* src/fontset.c (reorder_font_vector): Skip nil entries in the
loop that assigns scores to rfont_def's.
(fontset_compare_rfontdef): Cope with nil.  This has the effect of
moving any nil entries to the end of the font-group, and avoids
crashing if an element other than the last in the font-group is
nil.  (Bug#39892)
This commit is contained in:
Eli Zaretskii 2020-03-05 17:57:21 +02:00
parent 1814c7e158
commit 88c6db9196
1 changed files with 10 additions and 2 deletions
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12
src/fontset.c
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@ -367,8 +367,14 @@ fontset_add (Lisp_Object fontset, Lisp_Object range, Lisp_Object elt, Lisp_Objec
static int
fontset_compare_rfontdef (const void *val1, const void *val2)
{
return (RFONT_DEF_SCORE (*(Lisp_Object *) val1)
- RFONT_DEF_SCORE (*(Lisp_Object *) val2));
Lisp_Object v1 = *(Lisp_Object *) val1, v2 = *(Lisp_Object *) val2;
if (NILP (v1) && NILP (v2))
return 0;
else if (NILP (v1))
return INT_MIN;
else if (NILP (v2))
return INT_MAX;
return (RFONT_DEF_SCORE (v1) - RFONT_DEF_SCORE (v2));
}
/* Update a cons cell which has this form:
@ -400,6 +406,8 @@ reorder_font_vector (Lisp_Object font_group, struct font *font)
for (i = 0; i < size; i++)
{
Lisp_Object rfont_def = AREF (vec, i);
if (NILP (rfont_def))
continue;
Lisp_Object font_def = RFONT_DEF_FONT_DEF (rfont_def);
Lisp_Object font_spec = FONT_DEF_SPEC (font_def);
int score = RFONT_DEF_SCORE (rfont_def) & 0xFF;