From cda4527cefc55f4d9ade17cca717f60214b82062 Mon Sep 17 00:00:00 2001
From: Jakob Kaivo <jkk@ung.org>
Date: Mon, 29 Jun 2020 12:20:31 -0400
Subject: outline functions

---
 src/mapalloc.c | 35 +++++++++++++++++++++++++++++++++++
 src/mapalloc.h | 11 +++++++++++
 2 files changed, 46 insertions(+)
 create mode 100644 src/mapalloc.c
 create mode 100644 src/mapalloc.h

diff --git a/src/mapalloc.c b/src/mapalloc.c
new file mode 100644
index 0000000..bde39f9
--- /dev/null
+++ b/src/mapalloc.c
@@ -0,0 +1,35 @@
+#define _POSIX_C_SOURCE 200809L
+#include <sys/mman.h>
+#include <string.h>
+
+#include "mapalloc.h"
+
+void *map_calloc(size_t nelem, size_t elsize)
+{
+	size_t n = nelem * elsize;
+	if (n < nelem || n < elsize) {
+		/* overflow */
+		return NULL;
+	}
+	void *ptr = map_malloc(n);
+	memset(ptr, 0, n);
+	return ptr;
+}
+
+void *map_malloc(size_t n)
+{
+}
+
+void *map_realloc(void *ptr, size_t n)
+{
+	if (ptr == NULL) {
+		return map_malloc(n);
+	}
+}
+
+void map_free(void *ptr)
+{
+	if (ptr == NULL) {
+		return;
+	}
+}
diff --git a/src/mapalloc.h b/src/mapalloc.h
new file mode 100644
index 0000000..f4a4434
--- /dev/null
+++ b/src/mapalloc.h
@@ -0,0 +1,11 @@
+#ifndef MAPALLOC_H
+#define MAPALLOC_H
+
+#include <stddef.h>		/* for the definition of size_t */
+
+void *map_malloc(size_t n);
+void *map_calloc(size_t nelem, size_t elsize);
+void *map_realloc(void *ptr, size_t n);
+void map_free(void *ptr);
+
+#endif
-- 
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