[PATCH v2 04/10] git-compat-util: introduce `cast_size_t_to_ssize_t()`

From

Patrick Steinhardt <ps@pks.im>

Date

Mar 3, 2026, 15:00 UTC

Message-ID

<20260303-pks-upload-pack-write-contention-v2-4-7321830f08fe@pks.im>

In-Reply-To

<20260303-pks-upload-pack-write-contention-v2-0-7321830f08fe@pks.im>

Signed-off-by: Patrick Steinhardt <ps@pks.im>
---
 git-compat-util.h | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/git-compat-util.h b/git-compat-util.h
index bebcf9f698..c6af04cd7a 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -665,6 +665,14 @@ static inline int cast_size_t_to_int(size_t a)
 	return (int)a;
 }
 
+static inline ssize_t cast_size_t_to_ssize_t(size_t a)
+{
+	if (a > maximum_signed_value_of_type(ssize_t))
+		die("number too large to represent as ssize_t on this platform: %"PRIuMAX,
+		    (uintmax_t)a);
+	return (ssize_t)a;
+}
+
 static inline uint64_t u64_mult(uint64_t a, uint64_t b)
 {
 	if (unsigned_mult_overflows(a, b))

-- 
2.53.0.697.g625c4fb2da.dirty