prism/util/pm_integer.h

   1 /**
   2  * @file pm_integer.h
   3  *
   4  * This module provides functions for working with arbitrary-sized integers.
   5  */
   6 #ifndef PRISM_NUMBER_H
   7 #define PRISM_NUMBER_H
   8
   9 #include "prism/defines.h"
  10 #include "prism/util/pm_buffer.h"
  11
  12 #include <assert.h>
  13 #include <stdbool.h>
  14 #include <stdint.h>
  15 #include <stdlib.h>
  16
  17 /**
  18  * A structure represents an arbitrary-sized integer.
  19  */
  20 typedef struct {
  21     /**
  22      * The number of allocated values. length is set to 0 if the integer fits
  23      * into uint32_t.
  24      */
  25     size_t length;
  26
  27     /**
  28      * List of 32-bit integers. Set to NULL if the integer fits into uint32_t.
  29      */
  30     uint32_t *values;
  31
  32     /**
  33      * Embedded value for small integer. This value is set to 0 if the value
  34      * does not fit into uint32_t.
  35      */
  36     uint32_t value;
  37
  38     /**
  39      * Whether or not the integer is negative. It is stored this way so that a
  40      * zeroed pm_integer_t is always positive zero.