| // Ceres Solver - A fast non-linear least squares minimizer |
| // Copyright 2015 Google Inc. All rights reserved. |
| // http://ceres-solver.org/ |
| // |
| // 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. |
| // |
| // Author: Sanjay Ghemawat |
| |
| #include "ceres/stringprintf.h" |
| |
| #include <cerrno> |
| #include <cstdarg> // For va_list and related operations |
| #include <cstdio> // MSVC requires this for _vsnprintf |
| #include <string> |
| #include <vector> |
| |
| #include "ceres/internal/port.h" |
| |
| namespace ceres { |
| namespace internal { |
| |
| using std::string; |
| |
| // va_copy() was defined in the C99 standard. However, it did not appear in the |
| // C++ standard until C++11. This means that if Ceres is being compiled with a |
| // strict pre-C++11 standard (e.g. -std=c++03), va_copy() will NOT be defined, |
| // as we are using the C++ compiler (it would however be defined if we were |
| // using the C compiler). Note however that both GCC & Clang will in fact |
| // define va_copy() when compiling for C++ if the C++ standard is not explicitly |
| // specified (i.e. no -std=c++<XX> arg), even though it should not strictly be |
| // defined unless -std=c++11 (or greater) was passed. |
| #if !defined(va_copy) |
| #if defined (__GNUC__) |
| // On GCC/Clang, if va_copy() is not defined (C++ standard < C++11 explicitly |
| // specified), use the internal __va_copy() version, which should be present |
| // in even very old GCC versions. |
| #define va_copy(d, s) __va_copy(d, s) |
| #else |
| // Some older versions of MSVC do not have va_copy(), in which case define it. |
| // Although this is required for older MSVC versions, it should also work for |
| // other non-GCC/Clang compilers which also do not defined va_copy(). |
| #define va_copy(d, s) ((d) = (s)) |
| #endif // defined (__GNUC__) |
| #endif // !defined(va_copy) |
| |
| void StringAppendV(string* dst, const char* format, va_list ap) { |
| // First try with a small fixed size buffer |
| char space[1024]; |
| |
| // It's possible for methods that use a va_list to invalidate |
| // the data in it upon use. The fix is to make a copy |
| // of the structure before using it and use that copy instead. |
| va_list backup_ap; |
| va_copy(backup_ap, ap); |
| int result = vsnprintf(space, sizeof(space), format, backup_ap); |
| va_end(backup_ap); |
| |
| if (result < sizeof(space)) { |
| if (result >= 0) { |
| // Normal case -- everything fit. |
| dst->append(space, result); |
| return; |
| } |
| |
| #if defined (_MSC_VER) |
| // Error or MSVC running out of space. MSVC 8.0 and higher |
| // can be asked about space needed with the special idiom below: |
| va_copy(backup_ap, ap); |
| result = vsnprintf(NULL, 0, format, backup_ap); |
| va_end(backup_ap); |
| #endif |
| |
| if (result < 0) { |
| // Just an error. |
| return; |
| } |
| } |
| |
| // Increase the buffer size to the size requested by vsnprintf, |
| // plus one for the closing \0. |
| int length = result+1; |
| char* buf = new char[length]; |
| |
| // Restore the va_list before we use it again |
| va_copy(backup_ap, ap); |
| result = vsnprintf(buf, length, format, backup_ap); |
| va_end(backup_ap); |
| |
| if (result >= 0 && result < length) { |
| // It fit |
| dst->append(buf, result); |
| } |
| delete[] buf; |
| } |
| |
| |
| string StringPrintf(const char* format, ...) { |
| va_list ap; |
| va_start(ap, format); |
| string result; |
| StringAppendV(&result, format, ap); |
| va_end(ap); |
| return result; |
| } |
| |
| const string& SStringPrintf(string* dst, const char* format, ...) { |
| va_list ap; |
| va_start(ap, format); |
| dst->clear(); |
| StringAppendV(dst, format, ap); |
| va_end(ap); |
| return *dst; |
| } |
| |
| void StringAppendF(string* dst, const char* format, ...) { |
| va_list ap; |
| va_start(ap, format); |
| StringAppendV(dst, format, ap); |
| va_end(ap); |
| } |
| |
| } // namespace internal |
| } // namespace ceres |