1 // Ceres Solver - A fast non-linear least squares minimizer
2 // Copyright 2015 Google Inc. All rights reserved.
3 // http://ceres-solver.org/
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are met:
8 // * Redistributions of source code must retain the above copyright notice,
9 // this list of conditions and the following disclaimer.
10 // * Redistributions in binary form must reproduce the above copyright notice,
11 // this list of conditions and the following disclaimer in the documentation
12 // and/or other materials provided with the distribution.
13 // * Neither the name of Google Inc. nor the names of its contributors may be
14 // used to endorse or promote products derived from this software without
15 // specific prior written permission.
17 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
18 // AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 // IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 // ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
21 // LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
22 // CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
23 // SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24 // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
25 // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
26 // ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
27 // POSSIBILITY OF SUCH DAMAGE.
29 // Author: Sanjay Ghemawat
31 #include "ceres/stringprintf.h"
34 #include <cstdarg> // For va_list and related operations
35 #include <cstdio> // MSVC requires this for _vsnprintf
39 #include "ceres/internal/port.h"
46 // va_copy() was defined in the C99 standard. However, it did not appear in the
47 // C++ standard until C++11. This means that if Ceres is being compiled with a
48 // strict pre-C++11 standard (e.g. -std=c++03), va_copy() will NOT be defined,
49 // as we are using the C++ compiler (it would however be defined if we were
50 // using the C compiler). Note however that both GCC & Clang will in fact
51 // define va_copy() when compiling for C++ if the C++ standard is not explicitly
52 // specified (i.e. no -std=c++<XX> arg), even though it should not strictly be
53 // defined unless -std=c++11 (or greater) was passed.
55 #if defined (__GNUC__)
56 // On GCC/Clang, if va_copy() is not defined (C++ standard < C++11 explicitly
57 // specified), use the internal __va_copy() version, which should be present
58 // in even very old GCC versions.
59 #define va_copy(d, s) __va_copy(d, s)
61 // Some older versions of MSVC do not have va_copy(), in which case define it.
62 // Although this is required for older MSVC versions, it should also work for
63 // other non-GCC/Clang compilers which also do not defined va_copy().
64 #define va_copy(d, s) ((d) = (s))
65 #endif // defined (__GNUC__)
66 #endif // !defined(va_copy)
68 void StringAppendV(string* dst, const char* format, va_list ap) {
69 // First try with a small fixed size buffer
72 // It's possible for methods that use a va_list to invalidate
73 // the data in it upon use. The fix is to make a copy
74 // of the structure before using it and use that copy instead.
76 va_copy(backup_ap, ap);
77 int result = vsnprintf(space, sizeof(space), format, backup_ap);
80 if (result < sizeof(space)) {
82 // Normal case -- everything fit.
83 dst->append(space, result);
87 #if defined (_MSC_VER)
88 // Error or MSVC running out of space. MSVC 8.0 and higher
89 // can be asked about space needed with the special idiom below:
90 va_copy(backup_ap, ap);
91 result = vsnprintf(NULL, 0, format, backup_ap);
101 // Increase the buffer size to the size requested by vsnprintf,
102 // plus one for the closing \0.
103 int length = result+1;
104 char* buf = new char[length];
106 // Restore the va_list before we use it again
107 va_copy(backup_ap, ap);
108 result = vsnprintf(buf, length, format, backup_ap);
111 if (result >= 0 && result < length) {
113 dst->append(buf, result);
119 string StringPrintf(const char* format, ...) {
121 va_start(ap, format);
123 StringAppendV(&result, format, ap);
128 const string& SStringPrintf(string* dst, const char* format, ...) {
130 va_start(ap, format);
132 StringAppendV(dst, format, ap);
137 void StringAppendF(string* dst, const char* format, ...) {
139 va_start(ap, format);
140 StringAppendV(dst, format, ap);
144 } // namespace internal