| // 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 |