1 files changed, 75 insertions, 0 deletions
diff --git a/gnu/usr.bin/groff/libbib/map.c b/gnu/usr.bin/groff/libbib/map.c
new file mode 100644
index 0000000..9d0f13f
--- /dev/null
+++ b/gnu/usr.bin/groff/libbib/map.c
@@ -0,0 +1,75 @@
+/* Copyright (C) 1989, 1990, 1991, 1992 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 2, 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 groff; see the file COPYING.  If not, write to the Free Software
+Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
+
+#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
+
+char *mapread(fd, nbytes)
+     int fd;
+     int nbytes;
+{
+  char *p = (char *)mmap((caddr_t)0, (size_t)nbytes, PROT_READ,
+			 MAP_FILE|MAP_PRIVATE, fd, (off_t)0);
+  if (p == (char *)-1)
+    return 0;
+  /* mmap() shouldn't return 0 since MAP_FIXED wasn't specified. */
+  if (p == 0)
+    abort();
+  return p;
+}
+
+int unmap(p, len)
+     char *p;
+     int len;
+{
+  return munmap((caddr_t)p, len);
+}
+
+#else /* not HAVE_MMAP */
+
+#include <errno.h>
+
+#ifndef errno
+extern int errno;
+#endif
+
+char *mapread(fd, nbytes)
+     int fd;
+     int nbytes;
+{
+  errno = ENODEV;
+  return 0;
+}
+
+int unmap(p, len)
+     char *p;
+     int len;
+{
+  errno = EINVAL;
+  return -1;
+}
+
+#endif /* not HAVE_MMAP */