1 files changed, 67 insertions, 0 deletions

diff --git a/libetpan/src/data-types/mapping.c b/libetpan/src/data-types/mapping.c
new file mode 100644
index 0000000..5f2c4a4
--- a/dev/null
+++ b/libetpan/src/data-types/mapping.c
@@ -0,0 +1,67 @@
+/*
+ * libEtPan! -- a mail stuff library
+ *
+ * Copyright (C) 2001, 2005 - DINH Viet Hoa
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the libEtPan! project nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * $Id$
+ */
+
+#include "mapping.h"
+
+#include <unistd.h>
+#include <sys/mman.h>
+
+int get_mapping(size_t length, int prot, int flags,
+                int fd, off_t offset,
+                void ** presult, void ** pmapping, size_t * pmapping_size)
+{
+  void * mapping;
+  size_t mapping_size;
+  void * result;
+  size_t page_size;
+  off_t delta;
+
+  page_size = getpagesize();
+  delta = offset % page_size;
+
+  mapping = mmap(NULL, length + offset, prot, flags, fd, offset - delta);
+  if (mapping == MAP_FAILED)
+    return -1;
+
+  result = ((char *) mapping) + delta;
+
+  mapping_size = length + offset;
+
+  * pmapping = mapping;
+  * pmapping_size = mapping_size;
+  * presult = result;
+
+  return 0;
+}