libc: move calloc() into its own compilation unit

move calloc() in its own compilation unit to avoid
code duplication. also, calloc() is used rarely in
plan9 programs.

1 files changed, 13 insertions, 0 deletions

diff --git a/sys/src/libc/port/calloc.c b/sys/src/libc/port/calloc.c
new file mode 100644
index 000000000..b8319128f
--- /dev/null
+++ b/sys/src/libc/port/calloc.c
@@ -0,0 +1,13 @@
+#include <u.h>
+#include <libc.h>
+
+void*
+calloc(ulong n, ulong s)
+{
+	void *v;
+	if(n > 1 && ((ulong)-1)/n < s)
+		return nil;
+	if(v = mallocz(n*s, 1))
+		setmalloctag(v, getcallerpc(&n));
+	return v;
+}