integers.h

   1 /*
   2  * integers.h:
   3  * This header file ensures that we have u_int<n>_t types of the proper width,
   4  * using a rather convoluted set of conditionals generated by configure. This
   5  * is an almighty pain in the arse, and is completely irrelevant on most
   6  * systems which already define this stuff.
   7  *
   8  * $Id: integers.h,v 1.1 2002/11/04 12:28:43 chris Exp $
   9  *
  10  */
  11
  12 #ifndef __INTEGERS_H_ /* include guard */
  13 #define __INTEGERS_H_
  14
  15 #include <sys/types.h>
  16 #include "config.h"
  17
  18 #if SIZEOF_U_INT8_T != 1 || SIZEOF_U_INT16_T != 2 || SIZEOF_U_INT32_T != 4
  19
  20 #   if defined(HAVE_C99_INTS)
  21
  22         /*
  23          * Use the C99 standard-width integers, defined in some appropriate
  24          * header file.
  25          */
  26
  27 #       if defined(HAVE_STDINT_H)
  28 #           include <stdint.h>
  29 #       elif defined(HAVE_SYS_INTTYPES_H)
  30 #           include <sys/inttypes.h>
  31 #       endif
  32
  33         /* Don't replace existing u_int<n>_t types. */
  34 #       if SIZEOF_U_INT8_T != 1
  35             typedef uint8_t u_int8_t;
  36 #       endif
  37
  38 #       if SIZEOF_U_INT16_T != 2
  39             typedef uint16_t u_int16_t;
  40 #       endif
  41
  42 #       if SIZEOF_U_INT32_T != 4
  43             typedef uint32_t u_int32_t;
  44 #       endif
  45
  46 #   elif (SIZEOF_UNSIGNED_SHORT_INT == 2 || SIZEOF_UNSIGNED_INT == 2)    \
  47           && (SIZEOF_UNSIGNED_INT == 4 || SIZEOF_UNSIGNED_LONG_INT == 4)
  48
  49         /*
  50          * Use an appropriately-sized basic type.
  51          */
  52
  53 #       if SIZEOF_U_INT8_T != 1
  54             typedef unsigned char u_int8_t;         /* By definition. */
  55 #       endif
  56
  57 #       if SIZEOF_U_INT16_T != 2
  58 #           if SIZEOF_UNSIGNED_SHORT_INT == 2
  59                 typedef unsigned short int u_int16_t;
  60 #           elif SIZEOF_UNSIGNED_INT == 2
  61                 typedef unsigned int u_int16_t;     /* Not likely. */
  62 #           endif
  63 #       endif
  64
  65 #       if SIZEOF_U_INT32_T != 4
  66 #           if SIZEOF_UNSIGNED_INT == 4
  67                 typedef unsigned int u_int32_t;
  68 #           elif SIZEOF_UNSIGNED_LONG_INT == 4
  69                 typedef unsigned long int u_int32_t;
  70 #           endif
  71 #       endif
  72
  73         /* Whew. */
  74
  75 #   else
  76 #       error "Your C compiler seems to lack 16 and 32 bit unsigned integer types"
  77 #   endif
  78
  79 #endif /* No existing u_int<n>_t types. */
  80
  81 #endif /* __INTEGERS_H_ */