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      1 /*
      2  * Copyright (C) 2009 The Android Open Source Project
      3  * All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      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 copyright
     11  *    notice, this list of conditions and the following disclaimer in
     12  *    the documentation and/or other materials provided with the
     13  *    distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     16  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     17  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     18  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
     19  * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
     22  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
     25  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <ios_pos_types.h>
     30 
     31 namespace std {
     32 // Implementation of the fpos class for streams.
     33 
     34 fpos& fpos::operator+=(streamoff offs)  {
     35     const streamoff new_offs = mOffs + offs;
     36     if (offs > 0) {
     37         if (new_offs > mOffs) {
     38             mOffs = new_offs;
     39         } // else overflow.
     40     } else {
     41         if (new_offs < mOffs) {
     42             mOffs = new_offs;
     43         } // else overflow or 0.
     44     }
     45     return *this;
     46 }
     47 
     48 fpos fpos::operator+(streamoff offs) const {
     49     fpos pos(*this);
     50     pos += offs;
     51     return pos;
     52 }
     53 
     54 fpos fpos::operator-(streamoff offs) const {
     55     fpos pos(*this);
     56     pos -= offs;
     57     return pos;
     58 }
     59 
     60 }  // namespace std
     61