sal/rtl/strbuf.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <string.h>
  21
  22 #include <osl/interlck.h>
  23 #include <rtl/strbuf.hxx>
  24
  25 /*************************************************************************
  26  *  rtl_stringbuffer_newFromStr_WithLength
  27  */
  28 void SAL_CALL rtl_stringbuffer_newFromStr_WithLength( rtl_String ** newStr,
  29                                                       const sal_Char * value,
  30                                                       sal_Int32 count )
  31 {
  32     if (!value)
  33     {
  34         rtl_string_new_WithLength( newStr, 16 );
  35         return;
  36     }
  37
  38     rtl_string_new_WithLength( newStr, count + 16 );
  39     (*newStr)->length = count;
  40     memcpy( (*newStr)->buffer, value, count );
  41     return;
  42 }
  43
  44 /*************************************************************************
  45  *  rtl_stringbuffer_newFromStringBuffer
  46  */
  47 sal_Int32 SAL_CALL rtl_stringbuffer_newFromStringBuffer( rtl_String ** newStr,
  48                                                          sal_Int32 capacity,
  49                                                          rtl_String * oldStr )
  50 {
  51     sal_Int32 newCapacity = capacity;
  52
  53     if (newCapacity < oldStr->length)
  54         newCapacity = oldStr->length;
  55
  56     rtl_string_new_WithLength( newStr, newCapacity );
  57     if (oldStr->length > 0) {
  58         (*newStr)->length = oldStr->length;
  59         memcpy( (*newStr)->buffer, oldStr->buffer, oldStr->length );
  60     }
  61     return newCapacity;
  62 }
  63
  64 /*************************************************************************
  65  *  rtl_stringbuffer_ensureCapacity
  66  */
  67 void SAL_CALL rtl_stringbuffer_ensureCapacity
  68     (rtl_String ** This, sal_Int32* capacity, sal_Int32 minimumCapacity)
  69 {
  70     if (minimumCapacity > *capacity)
  71     {
  72         rtl_String * pTmp = *This;
  73         rtl_String * pNew = NULL;
  74         *capacity = ((*This)->length + 1) * 2;
  75         if (minimumCapacity > *capacity)
  76             /* still lower, set to the minimum capacity */
  77             *capacity = minimumCapacity;
  78
  79         rtl_string_new_WithLength(&pNew, *capacity);
  80         pNew->length = (*This)->length;
  81         *This = pNew;
  82
  83         memcpy( (*This)->buffer, pTmp->buffer, pTmp->length );
  84         rtl_string_release( pTmp );
  85     }
  86 }
  87
  88 /*************************************************************************
  89  *  rtl_stringbuffer_insert
  90  */
  91 void SAL_CALL rtl_stringbuffer_insert( rtl_String ** This,
  92                                        sal_Int32 * capacity,
  93                                        sal_Int32 offset,
  94                                        const sal_Char * str,
  95                                        sal_Int32 len )
  96 {
  97     sal_Int32 nOldLen;
  98     sal_Char * pBuf;
  99     sal_Int32 n;
 100     if( len != 0 )
 101     {
 102         if (*capacity < (*This)->length + len)
 103             rtl_stringbuffer_ensureCapacity( This, capacity, (*This)->length + len );
 104
 105         /*
 106         if( len == 1 )
 107             This->buffer
 108         */
 109         nOldLen = (*This)->length;
 110         pBuf = (*This)->buffer;
 111
 112         /* copy the tail */
 113         n = (nOldLen - offset);
 114         if( n == 1 )
 115             /* optimized for 1 character */
 116             pBuf[offset + len] = pBuf[offset];
 117         else if( n > 1 )
 118             memmove( pBuf + offset + len, pBuf + offset, n * sizeof(sal_Char) );
 119
 120         /* insert the new characters */
 121         n = len;
 122         if( len == 1 )
 123                             /* optimized for 1 character */
 124             pBuf[offset] = *str;
 125         else if( n > 1 )
 126             memcpy( pBuf + offset, str, len * sizeof(sal_Char) );
 127         (*This)->length = nOldLen + len;
 128         pBuf[ nOldLen + len ] = 0;
 129     }
 130 }
 131
 132 /*************************************************************************
 133  *  rtl_stringbuffer_remove
 134  */
 135 void SAL_CALL rtl_stringbuffer_remove( rtl_String ** This,
 136                                        sal_Int32 start,
 137                                        sal_Int32 len )
 138 {
 139     sal_Int32 nTailLen;
 140     sal_Char * pBuf;
 141
 142     if (len > (*This)->length - start)
 143         len = (*This)->length - start;
 144
 145     //remove nothing
 146     if (!len)
 147         return;
 148
 149     pBuf = (*This)->buffer;
 150     nTailLen = (*This)->length - ( start + len );
 151
 152     if (nTailLen)
 153     {
 154         /* move the tail */
 155         memmove(pBuf + start, pBuf + start + len, nTailLen * sizeof(sal_Char));
 156     }
 157
 158     (*This)->length-=len;
 159     pBuf[ (*This)->length ] = 0;
 160 }
 161
 162 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */