X-Git-Url: https://git.tokkee.org/?a=blobdiff_plain;f=git-compat-util.h;h=2af8d3edbe35dce35e940c5cccb91f9e06ebeff8;hb=ae5e97ec40a36408a8f90973c23e6143741ec732;hp=877096ecb09e524174ff22db3722d6428f43bcf4;hpb=c208e05bd9880028c980fafbc5dda3d17a603ac1;p=git.git

diff --git a/git-compat-util.h b/git-compat-util.h
index 877096ecb..2af8d3edb 100644
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -28,6 +28,18 @@
 #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
 #define bitsizeof(x)  (CHAR_BIT * sizeof(x))
 
+#define maximum_signed_value_of_type(a) \
+    (INTMAX_MAX >> (bitsizeof(intmax_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.
+ *
+ * Requires: a >= 0, typeof(a) equals typeof(b)
+ */
+#define signed_add_overflows(a, b) \
+    ((b) > maximum_signed_value_of_type(a) - (a))
+
 #ifdef __GNUC__
 #define TYPEOF(x) (__typeof__(x))
 #else
@@ -160,6 +172,10 @@ extern char *gitbasename(char *);
 #define PRIx32 "x"
 #endif
 
+#ifndef PRIo32
+#define PRIo32 "o"
+#endif
+
 #ifndef PATH_SEP
 #define PATH_SEP ':'
 #endif