1 files changed, 86 insertions, 0 deletions
diff --git a/src/libs/libbib/map.c b/src/libs/libbib/map.c
new file mode 100644
index 0000000..9eae72b
--- /dev/null
+++ b/src/libs/libbib/map.c
@@ -0,0 +1,86 @@
+/* Copyright (C) 1989- 2014  Free Software Foundation, Inc.
+     Written by James Clark (jjc@jclark.com)
+
+This file is part of groff.
+
+groff is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+groff is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+
+#include <config.h>
+
+#include <stdlib.h>
+
+#ifdef HAVE_MMAP
+
+#include <sys/types.h>
+#include <sys/mman.h>
+
+/* The Net-2 man pages says that a MAP_FILE flag is required. */
+#ifndef MAP_FILE
+#define MAP_FILE 0
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Prototypes */
+char *mapread(int, int);
+int unmap(char *, int);
+
+char *mapread(int fd, int nbytes)
+{
+  char *p = (char *)mmap((void *)0, (size_t)nbytes, PROT_READ,
+			 MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
+  if (p == MAP_FAILED)
+    return 0;
+  /* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
+  if (p == 0)
+    abort();
+  return p;
+}
+
+int unmap(char *p, int len)
+{
+  return munmap((void *)p, len);
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#else /* not HAVE_MMAP */
+
+#include <errno.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+char *mapread(int fd, int nbytes)
+{
+  errno = ENODEV;
+  return 0;
+}
+
+int unmap(char *p, int len)
+{
+  errno = EINVAL;
+  return -1;
+}
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* not HAVE_MMAP */