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-rw-r--r--git-compat-util.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/git-compat-util.h b/git-compat-util.h
index d6d269f..9c23622 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -31,6 +31,9 @@
#define maximum_signed_value_of_type(a) \
(INTMAX_MAX >> (bitsizeof(intmax_t) - bitsizeof(a)))
+#define maximum_unsigned_value_of_type(a) \
+ (UINTMAX_MAX >> (bitsizeof(uintmax_t) - bitsizeof(a)))
+
/*
* Signed integer overflow is undefined in C, so here's a helper macro
* to detect if the sum of two integers will overflow.
@@ -40,6 +43,9 @@
#define signed_add_overflows(a, b) \
((b) > maximum_signed_value_of_type(a) - (a))
+#define unsigned_add_overflows(a, b) \
+ ((b) > maximum_unsigned_value_of_type(a) - (a))
+
#ifdef __GNUC__
#define TYPEOF(x) (__typeof__(x))
#else