util: add realloc_multiply() helper

[elogind.git] / src / shared / util.h

diff --git a/src/shared/util.h b/src/shared/util.h
index e8552410c06114377232191b1155090083be117d..8ddd1a5daf600f49a9e94249a2735e514a2b90ed 100644 (file)
--- a/src/shared/util.h
+++ b/src/shared/util.h
@@ -666,14 +666,21 @@ DEFINE_TRIVIAL_CLEANUP_FUNC(FILE*, endmntent);
 #define _cleanup_close_pair_ _cleanup_(close_pairp)
 
 _malloc_  _alloc_(1, 2) static inline void *malloc_multiply(size_t a, size_t b) {
-        if (_unlikely_(b == 0 || a > ((size_t) -1) / b))
+        if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
                 return NULL;
 
         return malloc(a * b);
 }
 
+_alloc_(2, 3) static inline void *realloc_multiply(void *p, size_t a, size_t b) {
+        if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
+                return NULL;
+
+        return realloc(p, a * b);
+}
+
 _alloc_(2, 3) static inline void *memdup_multiply(const void *p, size_t a, size_t b) {
-        if (_unlikely_(b == 0 || a > ((size_t) -1) / b))
+        if (_unlikely_(b != 0 && a > ((size_t) -1) / b))
                 return NULL;
 
         return memdup(p, a * b);