1 // Copyright (c) 2008, Google Inc. 2 // All rights reserved. 3 // 4 // Redistribution and use in source and binary forms, with or without 5 // modification, are permitted provided that the following conditions are 6 // met: 7 // 8 // * Redistributions of source code must retain the above copyright 9 // notice, this list of conditions and the following disclaimer. 10 // * Redistributions in binary form must reproduce the above 11 // copyright notice, this list of conditions and the following disclaimer 12 // in the documentation and/or other materials provided with the 13 // distribution. 14 // * Neither the name of Google Inc. nor the names of its 15 // contributors may be used to endorse or promote products derived from 16 // this software without specific prior written permission. 17 // 18 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 30 // --- 31 // Author: sanjay (at) google.com (Sanjay Ghemawat) 32 33 #include <config.h> 34 #include <stdarg.h> 35 #include <stdio.h> 36 #include "raw_printer.h" 37 #include "base/logging.h" 38 39 namespace base { 40 41 RawPrinter::RawPrinter(char* buf, int length) 42 : base_(buf), 43 ptr_(buf), 44 limit_(buf + length - 1) { 45 RAW_DCHECK(length > 0, ""); 46 *ptr_ = '\0'; 47 *limit_ = '\0'; 48 } 49 50 void RawPrinter::Printf(const char* format, ...) { 51 if (limit_ > ptr_) { 52 va_list ap; 53 va_start(ap, format); 54 int avail = limit_ - ptr_; 55 // We pass avail+1 to vsnprintf() since that routine needs room 56 // to store the trailing \0. 57 const int r = perftools_vsnprintf(ptr_, avail+1, format, ap); 58 va_end(ap); 59 if (r < 0) { 60 // Perhaps an old glibc that returns -1 on truncation? 61 ptr_ = limit_; 62 } else if (r > avail) { 63 // Truncation 64 ptr_ = limit_; 65 } else { 66 ptr_ += r; 67 } 68 } 69 } 70 71 } 72
