Replace RE2 import with a dependency

third_party/re2/util/stringprintf.cc

-// Copyright 2002 The RE2 Authors.  All Rights Reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-#include "util/util.h"
-
-namespace re2 {
-
-static 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 >= 0) && (static_cast<unsigned long>(result) < sizeof(space))) {
-    // It fit
-    dst->append(space, result);
-    return;
-  }
-
-  // Repeatedly increase buffer size until it fits
-  int length = sizeof(space);
-  while (true) {
-    if (result < 0) {
-      // Older behavior: just try doubling the buffer size
-      length *= 2;
-    } else {
-      // We need exactly "result+1" characters
-      length = result+1;
-    }
-    char* buf = new char[length];
-
-    // Restore the va_list before we use it again
-    va_copy(backup_ap, ap);
-#if !defined(_WIN32)
-    result = vsnprintf(buf, length, format, backup_ap);
-#else
-    // On Windows, the function takes five arguments, not four. With an array,
-    // the buffer size will be inferred, but not with a pointer. C'est la vie.
-    // (See https://github.com/google/re2/issues/40 for more details.)
-    result = vsnprintf(buf, length, _TRUNCATE, format, backup_ap);
-#endif
-    va_end(backup_ap);
-
-    if ((result >= 0) && (result < length)) {
-      // It fit
-      dst->append(buf, result);
-      delete[] buf;
-      return;
-    }
-    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;
-}
-
-void SStringPrintf(string* dst, const char* format, ...) {
-  va_list ap;
-  va_start(ap, format);
-  dst->clear();
-  StringAppendV(dst, format, ap);
-  va_end(ap);
-}
-
-void StringAppendF(string* dst, const char* format, ...) {
-  va_list ap;
-  va_start(ap, format);
-  StringAppendV(dst, format, ap);
-  va_end(ap);
-}
-
-}  // namespace re2