icuSources/common/appendable.cpp

   1 /*
   2 *******************************************************************************
   3 *   Copyright (C) 2011-2012, International Business Machines
   4 *   Corporation and others.  All Rights Reserved.
   5 *******************************************************************************
   6 *   file name:  appendable.cpp
   7 *   encoding:   US-ASCII
   8 *   tab size:   8 (not used)
   9 *   indentation:4
  10 *
  11 *   created on: 2010dec07
  12 *   created by: Markus W. Scherer
  13 */
  14
  15 #include "unicode/utypes.h"
  16 #include "unicode/appendable.h"
  17 #include "unicode/utf16.h"
  18
  19 U_NAMESPACE_BEGIN
  20
  21 Appendable::~Appendable() {}
  22
  23 UBool
  24 Appendable::appendCodePoint(UChar32 c) {
  25     if(c<=0xffff) {
  26         return appendCodeUnit((UChar)c);
  27     } else {
  28         return appendCodeUnit(U16_LEAD(c)) && appendCodeUnit(U16_TRAIL(c));
  29     }
  30 }
  31
  32 UBool
  33 Appendable::appendString(const UChar *s, int32_t length) {
  34     if(length<0) {
  35         UChar c;
  36         while((c=*s++)!=0) {
  37             if(!appendCodeUnit(c)) {
  38                 return FALSE;
  39             }
  40         }
  41     } else if(length>0) {
  42         const UChar *limit=s+length;
  43         do {
  44             if(!appendCodeUnit(*s++)) {
  45                 return FALSE;
  46             }
  47         } while(s<limit);
  48     }
  49     return TRUE;
  50 }
  51
  52 UBool
  53 Appendable::reserveAppendCapacity(int32_t /*appendCapacity*/) {
  54     return TRUE;
  55 }
  56
  57 UChar *
  58 Appendable::getAppendBuffer(int32_t minCapacity,
  59                             int32_t /*desiredCapacityHint*/,
  60                             UChar *scratch, int32_t scratchCapacity,
  61                             int32_t *resultCapacity) {
  62     if(minCapacity<1 || scratchCapacity<minCapacity) {
  63         *resultCapacity=0;
  64         return NULL;
  65     }
  66     *resultCapacity=scratchCapacity;
  67     return scratch;
  68 }
  69
  70 // UnicodeStringAppendable is implemented in unistr.cpp.
  71
  72 U_NAMESPACE_END