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62 lines
2.3 KiB
C
62 lines
2.3 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Implements the C99 <inttypes.h> interface, minus the SCN* format macros. */
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#ifndef mozilla_IntegerPrintfMacros_h_
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#define mozilla_IntegerPrintfMacros_h_
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/*
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* MSVC++ doesn't include <inttypes.h>, even in versions shipping <stdint.h>, so
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* we have to reimplement it there. Note: <inttypes.h> #includes <stdint.h>.
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*
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* Note that this header DOES NOT implement <inttypes.h>'s scanf macros. MSVC's
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* scanf doesn't have sufficient format specifier support to implement them
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* (specifically, to implement scanning into an 8-bit location).
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*
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* http://stackoverflow.com/questions/3036396/scanfd-char-char-as-int-format-string
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*
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* Moreover, scanf is a footgun: if the input number exceeds the bounds of the
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* target type, behavior is undefined (in the compiler sense: that is, this code
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* could overwrite your hard drive with zeroes):
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*
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* uint8_t u;
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* sscanf("256", "%" SCNu8, &u); // BAD
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*
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* This header will sometimes provide SCN* macros, by dint of being implemented
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* using <inttypes.h>. But for these reasons, *never* use them!
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*/
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#if defined(MOZ_CUSTOM_INTTYPES_H)
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# include MOZ_CUSTOM_INTTYPES_H
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#elif defined(_MSC_VER)
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# include "mozilla/MSIntTypes.h"
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#else
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# include <inttypes.h>
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#endif
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/*
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* Fix up Android's broken [u]intptr_t inttype macros. Android's PRI*PTR
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* macros are defined as "ld", but sizeof(long) is 8 and sizeof(intptr_t)
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* is 4 on 32-bit Android. TestTypeTraits.cpp asserts that these new macro
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* definitions match the actual type sizes seen at compile time.
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*/
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#if defined(ANDROID) && !defined(__LP64__)
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# undef PRIdPTR /* intptr_t */
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# define PRIdPTR "d" /* intptr_t */
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# undef PRIiPTR /* intptr_t */
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# define PRIiPTR "i" /* intptr_t */
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# undef PRIoPTR /* uintptr_t */
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# define PRIoPTR "o" /* uintptr_t */
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# undef PRIuPTR /* uintptr_t */
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# define PRIuPTR "u" /* uintptr_t */
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# undef PRIxPTR /* uintptr_t */
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# define PRIxPTR "x" /* uintptr_t */
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# undef PRIXPTR /* uintptr_t */
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# define PRIXPTR "X" /* uintptr_t */
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#endif
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#endif /* mozilla_IntegerPrintfMacros_h_ */
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