source/common/appendable.cpp

   1 // Copyright (C) 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /*
   4 *******************************************************************************
   5 *   Copyright (C) 2011-2012, International Business Machines
   6 *   Corporation and others.  All Rights Reserved.
   7 *******************************************************************************
   8 *   file name:  appendable.cpp
   9 *   encoding:   US-ASCII
  10 *   tab size:   8 (not used)
  11 *   indentation:4
  12 *
  13 *   created on: 2010dec07
  14 *   created by: Markus W. Scherer
  15 */
  16
  17 #include "unicode/utypes.h"
  18 #include "unicode/appendable.h"
  19 #include "unicode/utf16.h"
  20
  21 U_NAMESPACE_BEGIN
  22
  23 Appendable::~Appendable() {}
  24
  25 UBool
  26 Appendable::appendCodePoint(UChar32 c) {
  27     if(c<=0xffff) {
  28         return appendCodeUnit((UChar)c);
  29     } else {
  30         return appendCodeUnit(U16_LEAD(c)) && appendCodeUnit(U16_TRAIL(c));
  31     }
  32 }
  33
  34 UBool
  35 Appendable::appendString(const UChar *s, int32_t length) {
  36     if(length<0) {
  37         UChar c;
  38         while((c=*s++)!=0) {
  39             if(!appendCodeUnit(c)) {
  40                 return FALSE;
  41             }
  42         }
  43     } else if(length>0) {
  44         const UChar *limit=s+length;
  45         do {
  46             if(!appendCodeUnit(*s++)) {
  47                 return FALSE;
  48             }
  49         } while(s<limit);
  50     }
  51     return TRUE;
  52 }
  53
  54 UBool
  55 Appendable::reserveAppendCapacity(int32_t /*appendCapacity*/) {
  56     return TRUE;
  57 }
  58
  59 UChar *
  60 Appendable::getAppendBuffer(int32_t minCapacity,
  61                             int32_t /*desiredCapacityHint*/,
  62                             UChar *scratch, int32_t scratchCapacity,
  63                             int32_t *resultCapacity) {
  64     if(minCapacity<1 || scratchCapacity<minCapacity) {
  65         *resultCapacity=0;
  66         return NULL;
  67     }
  68     *resultCapacity=scratchCapacity;
  69     return scratch;
  70 }
  71
  72 // UnicodeStringAppendable is implemented in unistr.cpp.
  73
  74 U_NAMESPACE_END