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// Protocol Buffers - Google's data interchange format // Copyright 2008 Google Inc. All rights reserved. // https://developers.google.com/protocol-buffers/ // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. #include <google/protobuf/io/strtod.h> #include <cstdio> #include <cstring> #include <string> #include <google/protobuf/stubs/common.h> namespace google { namespace protobuf { namespace io { // ---------------------------------------------------------------------- // NoLocaleStrtod() // This code will make you cry. // ---------------------------------------------------------------------- namespace { // Returns a string identical to *input except that the character pointed to // by radix_pos (which should be '.') is replaced with the locale-specific // radix character. string LocalizeRadix(const char* input, const char* radix_pos) { // Determine the locale-specific radix character by calling sprintf() to // print the number 1.5, then stripping off the digits. As far as I can // tell, this is the only portable, thread-safe way to get the C library // to divuldge the locale's radix character. No, localeconv() is NOT // thread-safe. char temp[16]; int size = sprintf(temp, "%.1f", 1.5); GOOGLE_CHECK_EQ(temp[0], '1'); GOOGLE_CHECK_EQ(temp[size-1], '5'); GOOGLE_CHECK_LE(size, 6); // Now replace the '.' in the input with it. string result; result.reserve(strlen(input) + size - 3); result.append(input, radix_pos); result.append(temp + 1, size - 2); result.append(radix_pos + 1); return result; } } // namespace double NoLocaleStrtod(const char* text, char** original_endptr) { // We cannot simply set the locale to "C" temporarily with setlocale() // as this is not thread-safe. Instead, we try to parse in the current // locale first. If parsing stops at a '.' character, then this is a // pretty good hint that we're actually in some other locale in which // '.' is not the radix character. char* temp_endptr; double result = strtod(text, &temp_endptr); if (original_endptr != NULL) *original_endptr = temp_endptr; if (*temp_endptr != '.') return result; // Parsing halted on a '.'. Perhaps we're in a different locale? Let's // try to replace the '.' with a locale-specific radix character and // try again. string localized = LocalizeRadix(text, temp_endptr); const char* localized_cstr = localized.c_str(); char* localized_endptr; result = strtod(localized_cstr, &localized_endptr); if ((localized_endptr - localized_cstr) > (temp_endptr - text)) { // This attempt got further, so replacing the decimal must have helped. // Update original_endptr to point at the right location. if (original_endptr != NULL) { // size_diff is non-zero if the localized radix has multiple bytes. int size_diff = localized.size() - strlen(text); // const_cast is necessary to match the strtod() interface. *original_endptr = const_cast<char*>( text + (localized_endptr - localized_cstr - size_diff)); } } return result; } } // namespace io } // namespace protobuf } // namespace google