1 files changed, 50 insertions, 0 deletions
diff --git a/contrib/nvi/clib/mmap.c b/contrib/nvi/clib/mmap.c
new file mode 100644
index 000000000000..7cea169650b4
--- /dev/null
+++ b/contrib/nvi/clib/mmap.c
@@ -0,0 +1,50 @@
+#include "config.h"
+
+#include <sys/types.h>
+
+#include <stdlib.h>
+#include <unistd.h>
+
+/*
+ * This function fakes mmap() by reading `len' bytes from the file descriptor
+ * `fd' and returning a pointer to that memory.  The "mapped" region can later
+ * be deallocated with munmap().
+ *
+ * Note: ONLY reading is supported and only reading of the exact size of the
+ * file will work.
+ *
+ * PUBLIC: #ifndef HAVE_MMAP
+ * PUBLIC: char *mmap __P((char *, size_t, int, int, int, off_t));
+ * PUBLIC: #endif
+ */
+char *
+mmap(addr, len, prot, flags, fd, off)
+	char *addr;
+	size_t len;
+	int prot, flags, fd;
+	off_t off;
+{
+	char *ptr;
+
+	if ((ptr = (char *)malloc(len)) == 0)
+		return ((char *)-1);
+	if (read(fd, ptr, len) < 0) {
+		free(ptr);
+		return ((char *)-1);
+	}
+	return (ptr);
+}
+
+/*
+ * PUBLIC: #ifndef HAVE_MMAP
+ * PUBLIC: int munmap __P((char *, size_t));
+ * PUBLIC: #endif
+ */
+int
+munmap(addr, len)
+	char *addr;
+	size_t len;
+{
+	free(addr);
+	return (0);
+}