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      1 /*---------------------------------------------------------------------------*
      2  *  LStringImpl.c  *
      3  *                                                                           *
      4  *  Copyright 2007, 2008 Nuance Communciations, Inc.                               *
      5  *                                                                           *
      6  *  Licensed under the Apache License, Version 2.0 (the 'License');          *
      7  *  you may not use this file except in compliance with the License.         *
      8  *                                                                           *
      9  *  You may obtain a copy of the License at                                  *
     10  *      http://www.apache.org/licenses/LICENSE-2.0                           *
     11  *                                                                           *
     12  *  Unless required by applicable law or agreed to in writing, software      *
     13  *  distributed under the License is distributed on an 'AS IS' BASIS,        *
     14  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. *
     15  *  See the License for the specific language governing permissions and      *
     16  *  limitations under the License.                                           *
     17  *                                                                           *
     18  *---------------------------------------------------------------------------*/
     19 
     20 #include "lstring.h"
     21 #include "LStringImpl.h"
     22 #include "plog.h"
     23 #include "pmemory.h"
     24 
     25 #define MTAG NULL
     26 #define INITIAL_SIZE 32
     27 
     28 ESR_ReturnCode LStringCreate(LString** self)
     29 {
     30   LStringImpl* impl;
     31 
     32   impl = NEW(LStringImpl, MTAG);
     33   if (impl == NULL)
     34     return ESR_OUT_OF_MEMORY;
     35   impl->Interface.append = &LString_Append;
     36   impl->Interface.toLCHAR = &LString_ToLCHAR;
     37   impl->Interface.reset = &LString_Reset;
     38   impl->Interface.destroy = &LString_Destroy;
     39   impl->size = INITIAL_SIZE;
     40   impl->value = MALLOC(sizeof(LCHAR) * INITIAL_SIZE, MTAG);
     41   if (impl->value == NULL)
     42   {
     43     PLogError(L("ESR_OUT_OF_MEMORY"));
     44     return ESR_OUT_OF_MEMORY;
     45   }
     46   LSTRCPY(impl->value, L(""));
     47   if (impl->value == NULL)
     48     return ESR_OUT_OF_MEMORY;
     49   *self = (LString*) impl;
     50   return ESR_SUCCESS;
     51 }
     52 
     53 ESR_ReturnCode LString_Append(LString* self, const LCHAR* value)
     54 {
     55   LStringImpl* impl = (LStringImpl*) self;
     56   size_t needed;
     57 
     58   needed = LSTRLEN(impl->value) + LSTRLEN(value) + 1;
     59 
     60   if (needed > impl->size)
     61   {
     62     LCHAR* temp = REALLOC(impl->value, sizeof(LCHAR) * (needed + (impl->size / 2)));
     63     if (temp == NULL)
     64       return ESR_OUT_OF_MEMORY;
     65     impl->size = sizeof(LCHAR) * (needed + (impl->size / 2));
     66     impl->value = temp;
     67   }
     68   LSTRCAT(impl->value, value);
     69   return ESR_SUCCESS;
     70 }
     71 
     72 ESR_ReturnCode LString_Reset(LString* self)
     73 {
     74   LStringImpl* impl = (LStringImpl*) self;
     75 
     76   LSTRCPY(impl->value, L(""));
     77   return ESR_SUCCESS;
     78 }
     79 
     80 ESR_ReturnCode LString_ToLCHAR(LString* self, LCHAR** result)
     81 {
     82   LStringImpl* impl = (LStringImpl*) self;
     83 
     84   if (result == NULL)
     85     return ESR_INVALID_ARGUMENT;
     86   *result = impl->value;
     87   impl->value = NULL;
     88   return self->destroy(self);
     89 }
     90 
     91 ESR_ReturnCode LString_Destroy(LString* self)
     92 {
     93   LStringImpl* impl = (LStringImpl*) self;
     94 
     95   FREE(impl->value);
     96   FREE(impl);
     97   return ESR_SUCCESS;
     98 }
     99