reintroduce calloc elison of memset for direct-mmapped allocations

[musl] / src / malloc / calloc.c

diff --git a/src/malloc/calloc.c b/src/malloc/calloc.c
index 322193c..bf6bddc 100644 (file)
--- a/src/malloc/calloc.c
+++ b/src/malloc/calloc.c
@@ -2,6 +2,7 @@
 #include <stdint.h>
 #include <string.h>
 #include <errno.h>
+#include "dynlink.h"
 
 static size_t mal0_clear(char *p, size_t n)
 {
@@ -23,6 +24,12 @@ static size_t mal0_clear(char *p, size_t n)
        }
 }
 
+static int allzerop(void *p)
+{
+       return 0;
+}
+weak_alias(allzerop, __malloc_allzerop);
+
 void *calloc(size_t m, size_t n)
 {
        if (n && m > (size_t)-1/n) {
@@ -31,7 +38,8 @@ void *calloc(size_t m, size_t n)
        }
        n *= m;
        void *p = malloc(n);
-       if (!p) return p;
+       if (!p || (!__malloc_replaced && __malloc_allzerop(p)))
+               return p;
        n = mal0_clear(p, n);
        return memset(p, 0, n);
 }