Add map.c with shared p_mmap param validation Forgot to add this file in the previous commit
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diff --git a/src/map.c b/src/map.c
new file mode 100644
index 0000000..56a37f3
--- /dev/null
+++ b/src/map.c
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2009-2012 the libgit2 contributors
+ *
+ * This file is part of libgit2, distributed under the GNU GPL v2 with
+ * a Linking Exception. For full terms see the included COPYING file.
+ */
+#include <git2/common.h>
+#include "map.h"
+
+int validate_map_args(
+ git_map *out, size_t len, int prot, int flags, int fd, git_off_t offset)
+{
+ GIT_UNUSED(fd);
+ GIT_UNUSED(offset);
+
+ if (out == NULL || len == 0) {
+ errno = EINVAL;
+ giterr_set(GITERR_OS, "Failed to mmap. No map or zero length");
+ return -1;
+ }
+
+ if (!(prot & GIT_PROT_WRITE) && !(prot & GIT_PROT_READ)) {
+ errno = EINVAL;
+ giterr_set(GITERR_OS, "Failed to mmap. Invalid protection parameters");
+ return -1;
+ }
+
+ if (flags & GIT_MAP_FIXED) {
+ errno = EINVAL;
+ giterr_set(GITERR_OS, "Failed to mmap. FIXED not set");
+ return -1;
+ }
+
+ return 0;
+}
+