Changeset c739102 in mainline for uspace/lib/c/include/ieee_double.h

Timestamp:

2012-11-21T23:26:22Z (12 years ago)

Author:

Jan Vesely <jano.vesely@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

0f2c80a

Parents:

bebf97d (diff), 1f7753a (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Mainline changes.

File:

• uspace/lib/c/include/ieee_double.h (moved) (moved from uspace/lib/ext2/libext2_block_group.h ) (2 diffs)

uspace/lib/c/include/ieee_double.h

@@ -1 +1 @@
 /*
- * Copyright (c) 2011 Martin Sucha
+ * Copyright (c) 2012 Adam Hraska
  * All rights reserved.
  *
@@ -27 +27 @@
  */
 
-/** @addtogroup libext2
- * @{
- */
-/**
- * @file
- */
+#ifndef IEEE_DOUBLE_H_
+#define IEEE_DOUBLE_H_
 
-#ifndef LIBEXT2_LIBEXT2_BLOCK_GROUP_H_
-#define LIBEXT2_LIBEXT2_BLOCK_GROUP_H_
+#include <stdint.h>
+#include <bool.h>
 
-#include <block.h>
+/** Represents a non-negative floating point number: significand * 2^exponent */
+typedef struct fp_num_t_tag {
+        /** Significand (aka mantissa). */
+        uint64_t significand;
+        /** Binary exponent. */
+        int exponent;
+} fp_num_t;
 
-typedef struct ext2_block_group {
-        uint32_t block_bitmap_block; // Block ID for block bitmap
-        uint32_t inode_bitmap_block; // Block ID for inode bitmap
-        uint32_t inode_table_first_block; // Block ID of first block of inode table 
-        uint16_t free_block_count; // Count of free blocks
-        uint16_t free_inode_count; // Count of free inodes
-        uint16_t directory_inode_count; // Number of inodes allocated to directories
-} ext2_block_group_t;
+/** Double number description according to IEEE 754. */
+typedef struct ieee_double_t_tag {
+        /** The number is a NaN or infinity. */
+        bool is_special;
+        /** Not a number. */
+        bool is_nan;
+        bool is_negative;
+        /** The number denoted infinity. */
+        bool is_infinity;
+        /** The number could not be represented as a normalized double. */
+        bool is_denormal;
+        /**
+         * The predecessor double is closer than the successor. This happens 
+         * if a normal number is of the form 2^k and it is not the smallest
+         * normal number. 
+         */
+        bool is_accuracy_step;
+        /** 
+         * If !is_special the double's value is:
+         *   pos_val.significand * 2^pos_val.exponent
+         */
+        fp_num_t pos_val;
+} ieee_double_t;
 
-typedef struct ext2_block_group_ref {
-        block_t *block; // Reference to a block containing this block group descr
-        ext2_block_group_t *block_group;
-} ext2_block_group_ref_t;
-
-#define EXT2_BLOCK_GROUP_DESCRIPTOR_SIZE 32
-
-extern uint32_t ext2_block_group_get_block_bitmap_block(ext2_block_group_t *);
-extern uint32_t ext2_block_group_get_inode_bitmap_block(ext2_block_group_t *);
-extern uint32_t ext2_block_group_get_inode_table_first_block(ext2_block_group_t *);
-extern uint16_t ext2_block_group_get_free_block_count(ext2_block_group_t *);
-extern uint16_t ext2_block_group_get_free_inode_count(ext2_block_group_t *);
-extern uint16_t ext2_block_group_get_directory_inode_count(ext2_block_group_t *);
-
-extern void     ext2_block_group_set_free_block_count(ext2_block_group_t *, uint16_t);
+extern ieee_double_t extract_ieee_double(double);
 
 #endif
-
-/** @}
- */