1 files changed, 37 insertions, 0 deletions
diff --git a/alloc.c b/alloc.c
new file mode 100644
index 0000000..34058b3
--- /dev/null
+++ b/alloc.c
@@ -0,0 +1,37 @@
+/* uuterm, Copyright (C) 2006 Rich Felker; licensed under GNU GPL v2 only */
+
+#include <stdlib.h>
+#include <sys/mman.h>
+
+#include "uuterm.h"
+
+void *uuterm_alloc(size_t len)
+{
+#ifdef MAP_ANONYMOUS
+	size_t *mem = mmap(0, len+sizeof(size_t),
+		PROT_READ|PROT_WRITE,
+		MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
+	if (mem == MAP_FAILED) return 0;
+	*mem++ = len;
+	return mem;
+#else
+	return malloc(len);
+#endif
+}
+
+void uuterm_free(void *buf)
+{
+#ifdef MAP_ANONYMOUS
+	size_t *mem = buf;
+	mem--;
+	munmap(mem, *mem);
+#else
+	free(buf);
+#endif
+}
+
+void *uuterm_buf_alloc(int w, int h)
+{
+	/* FIXME: do we care about overflows? */
+	return uuterm_alloc(UU_BUF_SIZE(w, h));
+}