initial check-in, version 0.5.0v0.5.0

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;
+}