Squashed 'third_party/protobuf/' content from commit e35e248
Change-Id: I6cbe123d09fe50fdcad0e51466665daeee7433c7
git-subtree-dir: third_party/protobuf
git-subtree-split: e35e24800fb8d694bdeea5fd63dc7d1b14d68723
diff --git a/src/google/protobuf/stubs/stringprintf.cc b/src/google/protobuf/stubs/stringprintf.cc
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+// Protocol Buffers - Google's data interchange format
+// Copyright 2012 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.
+
+// from google3/base/stringprintf.cc
+
+#include <google/protobuf/stubs/stringprintf.h>
+
+#include <errno.h>
+#include <stdarg.h> // For va_list and related operations
+#include <stdio.h> // MSVC requires this for _vsnprintf
+#include <vector>
+#include <google/protobuf/stubs/common.h>
+#include <google/protobuf/testing/googletest.h>
+
+namespace google {
+namespace protobuf {
+
+#ifdef _MSC_VER
+enum { IS_COMPILER_MSVC = 1 };
+#ifndef va_copy
+// Define va_copy for MSVC. This is a hack, assuming va_list is simply a
+// pointer into the stack and is safe to copy.
+#define va_copy(dest, src) ((dest) = (src))
+#endif
+#else
+enum { IS_COMPILER_MSVC = 0 };
+#endif
+
+void StringAppendV(string* dst, const char* format, va_list ap) {
+ // First try with a small fixed size buffer
+ static const int kSpaceLength = 1024;
+ char space[kSpaceLength];
+
+ // 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, kSpaceLength, format, backup_ap);
+ va_end(backup_ap);
+
+ if (result < kSpaceLength) {
+ if (result >= 0) {
+ // Normal case -- everything fit.
+ dst->append(space, result);
+ return;
+ }
+
+ if (IS_COMPILER_MSVC) {
+ // 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);
+ }
+
+ 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);
+}
+
+// Max arguments supported by StringPrintVector
+const int kStringPrintfVectorMaxArgs = 32;
+
+// An empty block of zero for filler arguments. This is const so that if
+// printf tries to write to it (via %n) then the program gets a SIGSEGV
+// and we can fix the problem or protect against an attack.
+static const char string_printf_empty_block[256] = { '\0' };
+
+string StringPrintfVector(const char* format, const vector<string>& v) {
+ GOOGLE_CHECK_LE(v.size(), kStringPrintfVectorMaxArgs)
+ << "StringPrintfVector currently only supports up to "
+ << kStringPrintfVectorMaxArgs << " arguments. "
+ << "Feel free to add support for more if you need it.";
+
+ // Add filler arguments so that bogus format+args have a harder time
+ // crashing the program, corrupting the program (%n),
+ // or displaying random chunks of memory to users.
+
+ const char* cstr[kStringPrintfVectorMaxArgs];
+ for (int i = 0; i < v.size(); ++i) {
+ cstr[i] = v[i].c_str();
+ }
+ for (int i = v.size(); i < GOOGLE_ARRAYSIZE(cstr); ++i) {
+ cstr[i] = &string_printf_empty_block[0];
+ }
+
+ // I do not know any way to pass kStringPrintfVectorMaxArgs arguments,
+ // or any way to build a va_list by hand, or any API for printf
+ // that accepts an array of arguments. The best I can do is stick
+ // this COMPILE_ASSERT right next to the actual statement.
+
+ GOOGLE_COMPILE_ASSERT(kStringPrintfVectorMaxArgs == 32, arg_count_mismatch);
+ return StringPrintf(format,
+ cstr[0], cstr[1], cstr[2], cstr[3], cstr[4],
+ cstr[5], cstr[6], cstr[7], cstr[8], cstr[9],
+ cstr[10], cstr[11], cstr[12], cstr[13], cstr[14],
+ cstr[15], cstr[16], cstr[17], cstr[18], cstr[19],
+ cstr[20], cstr[21], cstr[22], cstr[23], cstr[24],
+ cstr[25], cstr[26], cstr[27], cstr[28], cstr[29],
+ cstr[30], cstr[31]);
+}
+} // namespace protobuf
+} // namespace google