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undo: fix off-by-one when prepending to inline string

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This fixes the conditional in istring_prepend() to match other uses,
notably to match istring_append().

Fixes #6684
This commit is contained in:
Christian Hergert 2024-05-01 11:28:55 -07:00
parent a8fcde11de
commit d3c20c3269
1 changed files with 1 additions and 1 deletions
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2
gtk/gtkistringprivate.h
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@ -117,7 +117,7 @@ static inline void
istring_prepend (IString *str,
IString *other)
{
if G_LIKELY (str->n_bytes + other->n_bytes < sizeof str->u.buf - 1)
if G_LIKELY (str->n_bytes + other->n_bytes <= (sizeof str->u.buf - 1))
{
memmove (str->u.buf + other->n_bytes, str->u.buf, str->n_bytes);
memcpy (str->u.buf, other->u.buf, other->n_bytes);