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comparison: mfbt/IntegerPrintfMacros.h
mfbt/IntegerPrintfMacros.h
- branch
- TOR_BUG_9701
- changeset 8
- 97036ab72558
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| -1:000000000000 | 0:bac5bdd66157 |
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 4 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 /* Implements the C99 <inttypes.h> interface, minus the SCN* format macros. */ | |
| 7 | |
| 8 #ifndef mozilla_IntegerPrintfMacros_h_ | |
| 9 #define mozilla_IntegerPrintfMacros_h_ | |
| 10 | |
| 11 /* | |
| 12 * MSVC++ doesn't include <inttypes.h>, even in versions shipping <stdint.h>, so | |
| 13 * we have to reimplement it there. Note: <inttypes.h> #includes <stdint.h>. | |
| 14 * | |
| 15 * Note that this header DOES NOT implement <inttypes.h>'s scanf macros. MSVC's | |
| 16 * scanf doesn't have sufficient format specifier support to implement them | |
| 17 * (specifically, to implement scanning into an 8-bit location). | |
| 18 * | |
| 19 * http://stackoverflow.com/questions/3036396/scanfd-char-char-as-int-format-string | |
| 20 * | |
| 21 * Moreover, scanf is a footgun: if the input number exceeds the bounds of the | |
| 22 * target type, behavior is undefined (in the compiler sense: that is, this code | |
| 23 * could overwrite your hard drive with zeroes): | |
| 24 * | |
| 25 * uint8_t u; | |
| 26 * sscanf("256", "%" SCNu8, &u); // BAD | |
| 27 * | |
| 28 * This header will sometimes provide SCN* macros, by dint of being implemented | |
| 29 * using <inttypes.h>. But for these reasons, *never* use them! | |
| 30 */ | |
| 31 | |
| 32 #if defined(MOZ_CUSTOM_INTTYPES_H) | |
| 33 # include MOZ_CUSTOM_INTTYPES_H | |
| 34 #elif defined(_MSC_VER) | |
| 35 # include "mozilla/MSIntTypes.h" | |
| 36 #else | |
| 37 # include <inttypes.h> | |
| 38 #endif | |
| 39 | |
| 40 #endif /* mozilla_IntegerPrintfMacros_h_ */ |
