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-rw-r--r--src/malloc/calloc.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/src/malloc/calloc.c b/src/malloc/calloc.c
new file mode 100644
index 00000000..9d574562
--- /dev/null
+++ b/src/malloc/calloc.c
@@ -0,0 +1,23 @@
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+
+void *calloc(size_t m, size_t n)
+{
+ void *p;
+ size_t *z;
+ if (n && m > (size_t)-1/n) {
+ errno = ENOMEM;
+ return 0;
+ }
+ n *= m;
+ p = malloc(n);
+ if (!p) return 0;
+ /* Only do this for non-mmapped chunks */
+ if (((size_t *)p)[-1] & 7) {
+ /* Only write words that are not already zero */
+ m = (n + sizeof *z - 1)/sizeof *z;
+ for (z=p; m; m--, z++) if (*z) *z=0;
+ }
+ return p;
+}