Here's a start. It comes from here: http://www.pobox.com/~qed/pstdint.h Please note that the original file has a completely different mandate. To be an actual stdint.h this will probably need to be changed pretty substantially. For known missing parts and weaknesses look in the comments at the top.
/* A portable stdint.h * Copyright (c) 2006 Paul Hsieh * * Sublicensed under GNU FDL. * **************************************************************************** * * Version 0.1.5 * * The ANSI C standard committee, for the C99 standard, specified the * inclusion of a new standard include file called stdint.h. This is * a very useful and long desired include file which contains several * very precise definitions for integer scalar types that is * critically important for making portable several classes of * applications including cryptography, hashing, variable length * integer libraries and so on. But for most developers its likely * useful just for programming sanity. * * The problem is that most compiler vendors have decided not to * implement the C99 standard, and the next C++ language standard * (which has a lot more mindshare these days) will be a long time in * coming and its unknown whether or not it will include stdint.h or * how much adoption it will have. Either way, it will be a long time * before all compilers come with a stdint.h and it also does nothing * for the extremely large number of compilers available today which * do not include this file, or anything comparable to it. * * So that's what this file is all about. Its an attempt to build a * single universal include file that works on as many platforms as * possible to deliver what stdint.h is supposed to. A few things * that should be noted about this file: * * 1) It is not guaranteed to be portable and/or present an identical * interface on all platforms. The extreme variability of the * ANSI C standard makes this an impossibility right from the * very get go. Its really only meant to be useful for the vast * majority of platforms that possess the capability of * implementing usefully and precisely defined, standard sized * integer scalars. Systems which are not intrinsically 2s * complement may produce invalid constants. * * 2) There is an unavoidable use of non-reserved symbols. * * 3) Other standard include files are invoked. * * 4) This file may come in conflict with future platforms that do * include stdint.h. The hope is that one or the other can be * used with no real difference. * * 5) In the current verison, if your platform can't represent * int32_t, int16_t and int8_t, it just dumps out with a compiler * error. * * 6) 64 bit integers may or may not be defined. Test for their * presence with the test: #ifdef INT64_MAX or #ifdef UINT64_MAX. * Note that this is different from the C99 specification which * requires the existence of 64 bit support in the compiler. If * this is not defined for your platform, yet it is capable of * dealing with 64 bits then it is because this file has not yet * been extended to cover all of your system's capabilities. * * 7) (u)intptr_t may or may not be defined. Test for its presence * with the test: #ifdef PTRDIFF_MAX. If this is not defined * for your platform, then it is because this file has not yet * been extended to cover all of your system's capabilities, not * because its optional. * * 8) The following might not been defined even if your platform is * capable of defining it: * * WCHAR_MIN * WCHAR_MAX * (u)int64_t * PTRDIFF_MIN * PTRDIFF_MAX * (u)intptr_t * * 9) The following have not been defined: * * WINT_MIN * WINT_MAX * * 10) The criteria for defining (u)int_least(*)_t isn't clear, * except for systems which don't have a type that precisely * defined 8, 16, or 32 bit types (which this include file does * not support anyways). Default definitions have been given. * * 11) The criteria for defining (u)int_fast(*)_t isn't something I * would trust to any particular compiler vendor or the ANSI C * comittee. It is well known that "compatible systems" are * commonly created that have very different performance * characteristics from the systems they are compatible with, * especially those whose vendors make both the compiler and the * system. Default definitions have been given, but its strongly * recommended that users never use these definitions for any * reason (they do *NOT* deliver any serious guarantee of * improved performance -- not in this file, nor any vendor's * stdint.h). * * 12) The following macros: * * PRINTF_INTMAX_MODIFIER * PRINTF_INT64_MODIFIER * PRINTF_INT32_MODIFIER * PRINTF_INT16_MODIFIER * PRINTF_LEAST64_MODIFIER * PRINTF_LEAST32_MODIFIER * PRINTF_LEAST16_MODIFIER * PRINTF_INTPTR_MODIFIER * * are strings which have been defined as the modifiers required * for the "d", "u" and "x" printf formats to correctly output * (u)intmax_t, (u)int64_t, (u)int32_t, (u)int16_t, (u)least64_t, * (u)least32_t, (u)least16_t and (u)intptr_t types respectively. * PRINTF_INTPTR_MODIFIER is not defined for some systems which * provide their own stdint.h. PRINTF_INT64_MODIFIER is not * defined if INT64_MAX is not defined. These are an extension * beyond what C99 specifies must be in stdint.h. * * In addition, the following macros are defined: * * PRINTF_INTMAX_HEX_WIDTH * PRINTF_INT64_HEX_WIDTH * PRINTF_INT32_HEX_WIDTH * PRINTF_INT16_HEX_WIDTH * PRINTF_INT8_HEX_WIDTH * PRINTF_INTMAX_DEC_WIDTH * PRINTF_INT64_DEC_WIDTH * PRINTF_INT32_DEC_WIDTH * PRINTF_INT16_DEC_WIDTH * PRINTF_INT8_DEC_WIDTH * * Which specifies the maximum number of characters required to * print the number of that type in either hexadecimal or decimal. * These are an extension beyond what C99 specifies must be in * stdint.h. * * Compilers tested (all with 0 warnings at their highest respective * settings): Borland Turbo C 2.0, WATCOM C/C++ 11.0 (16 bits and 32 * bits), Microsoft Visual C++ 6.0 (32 bit), Microsoft Visual Studio * .net (VC7), Intel C++ 4.0, GNU gcc v3.3.3 * * This file should be considered a work in progress. Suggestions for * improvements, especially those which increase coverage are strongly * encouraged. * * Acknowledgements * * The following people have made significant contributions to the * development and testing of this file: * * Chris Howie * John Steele Scott * */ #include <stddef.h> #include <limits.h> #include <signal.h> /* * For gcc with _STDINT_H, fill in the PRINTF_INT*_MODIFIER macros, and * do nothing else. */ #if ((defined(__STDC__) && __STDC__ && __STDC_VERSION__ >= 199901L) || (defined(__GNUC__) && defined(_STDINT_H))) && !defined (_PSTDINT_H_INCLUDED) #include <stdint.h> #define _PSTDINT_H_INCLUDED # ifndef PRINTF_INT64_MODIFIER # define PRINTF_INT64_MODIFIER "ll" # endif # ifndef PRINTF_INT32_MODIFIER # define PRINTF_INT32_MODIFIER "l" # endif # ifndef PRINTF_INT16_MODIFIER # define PRINTF_INT16_MODIFIER "h" # endif # ifndef PRINTF_INTMAX_MODIFIER # define PRINTF_INTMAX_MODIFIER PRINTF_INT64_MODIFIER # endif # ifndef PRINTF_INT64_HEX_WIDTH # define PRINTF_INT64_HEX_WIDTH "16" # endif # ifndef PRINTF_INT32_HEX_WIDTH # define PRINTF_INT32_HEX_WIDTH "8" # endif # ifndef PRINTF_INT16_HEX_WIDTH # define PRINTF_INT16_HEX_WIDTH "4" # endif # ifndef PRINTF_INT8_HEX_WIDTH # define PRINTF_INT8_HEX_WIDTH "2" # endif # ifndef PRINTF_INT64_DEC_WIDTH # define PRINTF_INT64_DEC_WIDTH "20" # endif # ifndef PRINTF_INT32_DEC_WIDTH # define PRINTF_INT32_DEC_WIDTH "10" # endif # ifndef PRINTF_INT16_DEC_WIDTH # define PRINTF_INT16_DEC_WIDTH "5" # endif # ifndef PRINTF_INT8_DEC_WIDTH # define PRINTF_INT8_DEC_WIDTH "3" # endif # ifndef PRINTF_INTMAX_HEX_WIDTH # define PRINTF_INTMAX_HEX_WIDTH PRINTF_INT64_HEX_WIDTH # endif # ifndef PRINTF_INTMAX_DEC_WIDTH # define PRINTF_INTMAX_DEC_WIDTH PRINTF_INT64_DEC_WIDTH # endif #endif #ifndef _PSTDINT_H_INCLUDED #define _PSTDINT_H_INCLUDED #ifndef SIZE_MAX # define SIZE_MAX (~(size_t)0) #endif /* * Deduce the type assignments from limits.h under the assumption that * integer sizes in bits are powers of 2, and follow the ANSI * definitions. */ #ifndef UINT8_MAX # define UINT8_MAX 0xff #endif #ifndef uint8_t # if (UCHAR_MAX == UINT8_MAX) || defined (S_SPLINT_S) typedef unsigned char uint8_t; # define UINT8_C(v) ((uint8_t) v) # else # error "Platform not supported" # endif #endif #ifndef INT8_MAX # define INT8_MAX 0x7f #endif #ifndef INT8_MIN # define INT8_MIN INT8_C(0x80) #endif #ifndef int8_t # if (SCHAR_MAX == INT8_MAX) || defined (S_SPLINT_S) typedef signed char int8_t; # define INT8_C(v) ((int8_t) v) # else # error "Platform not supported" # endif #endif #ifndef UINT16_MAX # define UINT16_MAX 0xffff #endif #ifndef uint16_t #if (UINT_MAX == UINT16_MAX) || defined (S_SPLINT_S) typedef unsigned int uint16_t; # ifndef PRINTF_INT16_MODIFIER # define PRINTF_INT16_MODIFIER "" # endif # define UINT16_C(v) ((uint16_t) (v)) #elif (USHRT_MAX == UINT16_MAX) typedef unsigned short uint16_t; # define UINT16_C(v) ((uint16_t) (v)) # ifndef PRINTF_INT16_MODIFIER # define PRINTF_INT16_MODIFIER "h" # endif #else #error "Platform not supported" #endif #endif #ifndef INT16_MAX # define INT16_MAX 0x7fff #endif #ifndef INT16_MIN # define INT16_MIN INT16_C(0x8000) #endif #ifndef int16_t #if (INT_MAX == INT16_MAX) || defined (S_SPLINT_S) typedef signed int int16_t; # define INT16_C(v) ((int16_t) (v)) # ifndef PRINTF_INT16_MODIFIER # define PRINTF_INT16_MODIFIER "" # endif #elif (SHRT_MAX == INT16_MAX) typedef signed short int16_t; # define INT16_C(v) ((int16_t) (v)) # ifndef PRINTF_INT16_MODIFIER # define PRINTF_INT16_MODIFIER "h" # endif #else #error "Platform not supported" #endif #endif #ifndef UINT32_MAX # define UINT32_MAX (0xffffffffUL) #endif #ifndef uint32_t #if (ULONG_MAX == UINT32_MAX) || defined (S_SPLINT_S) typedef unsigned long uint32_t; # define UINT32_C(v) v ## UL # ifndef PRINTF_INT32_MODIFIER # define PRINTF_INT32_MODIFIER "l" # endif #elif (UINT_MAX == UINT32_MAX) typedef unsigned int uint32_t; # ifndef PRINTF_INT32_MODIFIER # define PRINTF_INT32_MODIFIER "" # endif # define UINT32_C(v) v ## U #elif (USHRT_MAX == UINT32_MAX) typedef unsigned short uint32_t; # define UINT32_C(v) ((unsigned short) (v)) # ifndef PRINTF_INT32_MODIFIER # define PRINTF_INT32_MODIFIER "" # endif #else #error "Platform not supported" #endif #endif #ifndef INT32_MAX # define INT32_MAX (0x7fffffffL) #endif #ifndef INT32_MIN # define INT32_MIN INT32_C(0x80000000) #endif #ifndef int32_t #if (LONG_MAX == INT32_MAX) || defined (S_SPLINT_S) typedef signed long int32_t; # define INT32_C(v) v ## L # ifndef PRINTF_INT32_MODIFIER # define PRINTF_INT32_MODIFIER "l" # endif #elif (INT_MAX == INT32_MAX) typedef signed int int32_t; # define INT32_C(v) v # ifndef PRINTF_INT32_MODIFIER # define PRINTF_INT32_MODIFIER "" # endif #elif (SHRT_MAX == INT32_MAX) typedef signed short int32_t; # define INT32_C(v) ((short) (v)) # ifndef PRINTF_INT32_MODIFIER # define PRINTF_INT32_MODIFIER "" # endif #else #error "Platform not supported" #endif #endif /* * The macro stdint_int64_defined is temporarily used to record * whether or not 64 integer support is available. It must be * defined for any 64 integer extensions for new platforms that are * added. */ #undef stdint_int64_defined #if (defined(__STDC__) && defined(__STDC_VERSION__)) || defined (S_SPLINT_S) # if (__STDC__ && __STDC_VERSION >= 199901L) || defined (S_SPLINT_S) # define stdint_int64_defined typedef long long int64_t; typedef unsigned long long uint64_t; # define UINT64_C(v) v ## ULL # define INT64_C(v) v ## LL # ifndef PRINTF_INT64_MODIFIER # define PRINTF_INT64_MODIFIER "ll" # endif # endif #endif #if !defined (stdint_int64_defined) # if defined(__GNUC__) # define stdint_int64_defined __extension__ typedef long long int64_t; __extension__ typedef unsigned long long uint64_t; # define UINT64_C(v) v ## ULL # define INT64_C(v) v ## LL # ifndef PRINTF_INT64_MODIFIER # define PRINTF_INT64_MODIFIER "ll" # endif # elif defined(__MWERKS__) || defined (__SUNPRO_C) || defined (__SUNPRO_CC) || defined (__APPLE_CC__) || defined (_LONG_LONG) || defined (_CRAYC) || defined (S_SPLINT_S) # define stdint_int64_defined typedef long long int64_t; typedef unsigned long long uint64_t;