Squashed 'third_party/gperftools/' content from commit 54505f1
Change-Id: Id02e833828732b0efe7dac722b8485279e67c5fa
git-subtree-dir: third_party/gperftools
git-subtree-split: 54505f1d50c2d1f4676f5e87090b64a117fd980e
diff --git a/src/raw_printer.h b/src/raw_printer.h
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+// -*- Mode: C++; c-basic-offset: 2; indent-tabs-mode: nil -*-
+// Copyright (c) 2008, Google Inc.
+// All rights reserved.
+//
+// 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
+//
+// A printf() wrapper that writes into a fixed length buffer.
+// Useful in low-level code that does not want to use allocating
+// routines like StringPrintf().
+//
+// The implementation currently uses vsnprintf(). This seems to
+// be fine for use in many low-level contexts, but we may need to
+// rethink this decision if we hit a problem with it calling
+// down into malloc() etc.
+
+#ifndef BASE_RAW_PRINTER_H_
+#define BASE_RAW_PRINTER_H_
+
+#include <config.h>
+#include "base/basictypes.h"
+
+namespace base {
+
+class RawPrinter {
+ public:
+ // REQUIRES: "length > 0"
+ // Will printf any data added to this into "buf[0,length-1]" and
+ // will arrange to always keep buf[] null-terminated.
+ RawPrinter(char* buf, int length);
+
+ // Return the number of bytes that have been appended to the string
+ // so far. Does not count any bytes that were dropped due to overflow.
+ int length() const { return (ptr_ - base_); }
+
+ // Return the number of bytes that can be added to this.
+ int space_left() const { return (limit_ - ptr_); }
+
+ // Format the supplied arguments according to the "format" string
+ // and append to this. Will silently truncate the output if it does
+ // not fit.
+ void Printf(const char* format, ...)
+#ifdef HAVE___ATTRIBUTE__
+ __attribute__ ((__format__ (__printf__, 2, 3)))
+#endif
+;
+
+ private:
+ // We can write into [ptr_ .. limit_-1].
+ // *limit_ is also writable, but reserved for a terminating \0
+ // in case we overflow.
+ //
+ // Invariants: *ptr_ == \0
+ // Invariants: *limit_ == \0
+ char* base_; // Initial pointer
+ char* ptr_; // Where should we write next
+ char* limit_; // One past last non-\0 char we can write
+
+ DISALLOW_COPY_AND_ASSIGN(RawPrinter);
+};
+
+}
+
+#endif // BASE_RAW_PRINTER_H_