mfbt/IntegerPrintfMacros.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* Implements the C99 <inttypes.h> interface. */
   8
   9 #ifndef mozilla_IntegerPrintfMacros_h_
  10 #define mozilla_IntegerPrintfMacros_h_
  11
  12 /*
  13  * scanf is a footgun: if the input number exceeds the bounds of the target
  14  * type, behavior is undefined (in the compiler sense: that is, this code
  15  * could overwrite your hard drive with zeroes):
  16  *
  17  *   uint8_t u;
  18  *   sscanf("256", "%" SCNu8, &u); // BAD
  19  *
  20  * For this reason, *never* use the SCN* macros provided by this header!
  21  */
  22
  23 #include <inttypes.h>
  24
  25 /*
  26  * Fix up Android's broken [u]intptr_t inttype macros. Android's PRI*PTR
  27  * macros are defined as "ld", but sizeof(long) is 8 and sizeof(intptr_t)
  28  * is 4 on 32-bit Android. TestTypeTraits.cpp asserts that these new macro
  29  * definitions match the actual type sizes seen at compile time.
  30  */
  31 #if defined(ANDROID) && !defined(__LP64__)
  32 #  undef  PRIdPTR      /* intptr_t  */
  33 #  define PRIdPTR "d"  /* intptr_t  */
  34 #  undef  PRIiPTR      /* intptr_t  */
  35 #  define PRIiPTR "i"  /* intptr_t  */
  36 #  undef  PRIoPTR      /* uintptr_t */
  37 #  define PRIoPTR "o"  /* uintptr_t */
  38 #  undef  PRIuPTR      /* uintptr_t */
  39 #  define PRIuPTR "u"  /* uintptr_t */
  40 #  undef  PRIxPTR      /* uintptr_t */
  41 #  define PRIxPTR "x"  /* uintptr_t */
  42 #  undef  PRIXPTR      /* uintptr_t */
  43 #  define PRIXPTR "X"  /* uintptr_t */
  44 #endif
  45
  46 #endif  /* mozilla_IntegerPrintfMacros_h_ */