1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mfbt/IntegerPrintfMacros.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,40 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.7 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +/* Implements the C99 <inttypes.h> interface, minus the SCN* format macros. */
1.10 +
1.11 +#ifndef mozilla_IntegerPrintfMacros_h_
1.12 +#define mozilla_IntegerPrintfMacros_h_
1.13 +
1.14 +/*
1.15 + * MSVC++ doesn't include <inttypes.h>, even in versions shipping <stdint.h>, so
1.16 + * we have to reimplement it there. Note: <inttypes.h> #includes <stdint.h>.
1.17 + *
1.18 + * Note that this header DOES NOT implement <inttypes.h>'s scanf macros. MSVC's
1.19 + * scanf doesn't have sufficient format specifier support to implement them
1.20 + * (specifically, to implement scanning into an 8-bit location).
1.21 + *
1.22 + * http://stackoverflow.com/questions/3036396/scanfd-char-char-as-int-format-string
1.23 + *
1.24 + * Moreover, scanf is a footgun: if the input number exceeds the bounds of the
1.25 + * target type, behavior is undefined (in the compiler sense: that is, this code
1.26 + * could overwrite your hard drive with zeroes):
1.27 + *
1.28 + * uint8_t u;
1.29 + * sscanf("256", "%" SCNu8, &u); // BAD
1.30 + *
1.31 + * This header will sometimes provide SCN* macros, by dint of being implemented
1.32 + * using <inttypes.h>. But for these reasons, *never* use them!
1.33 + */
1.34 +
1.35 +#if defined(MOZ_CUSTOM_INTTYPES_H)
1.36 +# include MOZ_CUSTOM_INTTYPES_H
1.37 +#elif defined(_MSC_VER)
1.38 +# include "mozilla/MSIntTypes.h"
1.39 +#else
1.40 +# include <inttypes.h>
1.41 +#endif
1.42 +
1.43 +#endif /* mozilla_IntegerPrintfMacros_h_ */
