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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_
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