X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=git-compat-util.h;h=9c23622ed5ee9b60d40921ae74dd1149e1d68b8c;hb=c7934306d1504325d26950f35759ad478772e9c3;hp=d6d269f138b06791ba6e8712b06036f00a73c7e3;hpb=6a79be3e30a8682064ef91b9598642198cddef44;p=git.git

diff --git a/git-compat-util.h b/git-compat-util.h
index d6d269f13..9c23622ed 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