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Diffstat (limited to 'third_party/tcmalloc/chromium/src/raw_printer.h')
-rw-r--r-- | third_party/tcmalloc/chromium/src/raw_printer.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/third_party/tcmalloc/chromium/src/raw_printer.h b/third_party/tcmalloc/chromium/src/raw_printer.h new file mode 100644 index 0000000..62340bb --- /dev/null +++ b/third_party/tcmalloc/chromium/src/raw_printer.h @@ -0,0 +1,89 @@ +// 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_ |