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// Protocol Buffers - Google's data interchange format
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// Copyright 2008 Google Inc. All rights reserved.
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// http://code.google.com/p/protobuf/
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <google/protobuf/io/strtod.h>
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#include <google/protobuf/stubs/common.h>
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// ----------------------------------------------------------------------
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// This code will make you cry.
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// ----------------------------------------------------------------------
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// Returns a string identical to *input except that the character pointed to
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// by radix_pos (which should be '.') is replaced with the locale-specific
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string LocalizeRadix(const char* input, const char* radix_pos) {
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// Determine the locale-specific radix character by calling sprintf() to
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// print the number 1.5, then stripping off the digits. As far as I can
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// tell, this is the only portable, thread-safe way to get the C library
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// to divuldge the locale's radix character. No, localeconv() is NOT
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int size = sprintf(temp, "%.1f", 1.5);
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GOOGLE_CHECK_EQ(temp[0], '1');
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GOOGLE_CHECK_EQ(temp[size-1], '5');
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GOOGLE_CHECK_LE(size, 6);
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// Now replace the '.' in the input with it.
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result.reserve(strlen(input) + size - 3);
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result.append(input, radix_pos);
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result.append(temp + 1, size - 2);
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result.append(radix_pos + 1);
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double NoLocaleStrtod(const char* text, char** original_endptr) {
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// We cannot simply set the locale to "C" temporarily with setlocale()
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// as this is not thread-safe. Instead, we try to parse in the current
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// locale first. If parsing stops at a '.' character, then this is a
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// pretty good hint that we're actually in some other locale in which
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// '.' is not the radix character.
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double result = strtod(text, &temp_endptr);
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if (original_endptr != NULL) *original_endptr = temp_endptr;
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if (*temp_endptr != '.') return result;
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// Parsing halted on a '.'. Perhaps we're in a different locale? Let's
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// try to replace the '.' with a locale-specific radix character and
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string localized = LocalizeRadix(text, temp_endptr);
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const char* localized_cstr = localized.c_str();
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char* localized_endptr;
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result = strtod(localized_cstr, &localized_endptr);
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if ((localized_endptr - localized_cstr) >
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(temp_endptr - text)) {
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// This attempt got further, so replacing the decimal must have helped.
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// Update original_endptr to point at the right location.
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if (original_endptr != NULL) {
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// size_diff is non-zero if the localized radix has multiple bytes.
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int size_diff = localized.size() - strlen(text);
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// const_cast is necessary to match the strtod() interface.
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*original_endptr = const_cast<char*>(
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text + (localized_endptr - localized_cstr - size_diff));
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} // namespace protobuf
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} // namespace google
added
removed
src/google/protobuf/io/strtod.cc
