Protocol Buffers - Google's data interchange format (grpc依赖)
https://developers.google.com/protocol-buffers/
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57 lines
1.7 KiB
57 lines
1.7 KiB
// Protocol Buffers - Google's data interchange format |
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// Copyright 2023 Google LLC. All rights reserved. |
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// |
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// Use of this source code is governed by a BSD-style |
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// license that can be found in the LICENSE file or at |
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// https://developers.google.com/open-source/licenses/bsd |
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#include "upb/lex/round_trip.h" |
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#include <float.h> |
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#include <math.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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// Must be last. |
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#include "upb/port/def.inc" |
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/* Miscellaneous utilities ****************************************************/ |
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static void upb_FixLocale(char* p) { |
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/* printf() is dependent on locales; sadly there is no easy and portable way |
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* to avoid this. This little post-processing step will translate 1,2 -> 1.2 |
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* since JSON needs the latter. Arguably a hack, but it is simple and the |
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* alternatives are far more complicated, platform-dependent, and/or larger |
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* in code size. */ |
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for (; *p; p++) { |
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if (*p == ',') *p = '.'; |
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} |
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} |
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void _upb_EncodeRoundTripDouble(double val, char* buf, size_t size) { |
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assert(size >= kUpb_RoundTripBufferSize); |
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if (isnan(val)) { |
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snprintf(buf, size, "%s", "nan"); |
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return; |
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} |
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snprintf(buf, size, "%.*g", DBL_DIG, val); |
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if (strtod(buf, NULL) != val) { |
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snprintf(buf, size, "%.*g", DBL_DIG + 2, val); |
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assert(strtod(buf, NULL) == val); |
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} |
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upb_FixLocale(buf); |
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} |
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void _upb_EncodeRoundTripFloat(float val, char* buf, size_t size) { |
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assert(size >= kUpb_RoundTripBufferSize); |
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if (isnan(val)) { |
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snprintf(buf, size, "%s", "nan"); |
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return; |
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} |
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snprintf(buf, size, "%.*g", FLT_DIG, val); |
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if (strtof(buf, NULL) != val) { |
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snprintf(buf, size, "%.*g", FLT_DIG + 3, val); |
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assert(strtof(buf, NULL) == val); |
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} |
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upb_FixLocale(buf); |
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}
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