modules/luni/src/main/native/launcher/shared/strbuf.c

/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You under the Apache License, Version 2.0
 *  (the "License"); you may not use this file except in compliance with
 *  the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

#include <string.h>

#include "libhlp.h"

#define MIN_GROWTH 128

HyStringBuffer *
strBufferCat (struct HyPortLibrary * portLibrary, HyStringBuffer * buffer,
              const char *string)
{
  UDATA len = strlen (string);

  buffer = strBufferEnsure (portLibrary, buffer, len);
  if (buffer)
    {
      strcat ((char *)(buffer->data), string);
      buffer->remaining -= len;
    }

  return buffer;
}

HyStringBuffer *
strBufferEnsure (struct HyPortLibrary * portLibrary, HyStringBuffer * buffer,
                 UDATA len)
{

  if (buffer == NULL)
    {
      PORT_ACCESS_FROM_PORT (portLibrary);
      UDATA newSize = len > MIN_GROWTH ? len : MIN_GROWTH;
      buffer = hymem_allocate_memory (newSize + 1 + sizeof (UDATA));    /* 1 for null terminator */
      if (buffer != NULL)
        {
          buffer->remaining = newSize;
          buffer->data[0] = '\0';
        }
      return buffer;
    }

  if (len > buffer->remaining)
    {
      PORT_ACCESS_FROM_PORT (portLibrary);
      UDATA newSize = len > MIN_GROWTH ? len : MIN_GROWTH;
      HyStringBuffer *new =
        hymem_allocate_memory (strlen ((char *)(buffer->data)) + newSize +
                               sizeof (UDATA) + 1);
      if (new)
        {
          new->remaining = newSize;
          strcpy ((char *)(new->data), (char *)(buffer->data));
        }
      hymem_free_memory (buffer);
      return new;
    }

  return buffer;
}

HyStringBuffer *
strBufferPrepend (struct HyPortLibrary * portLibrary, HyStringBuffer * buffer,
                  char *string)
{
  UDATA len = strlen (string);

  buffer = strBufferEnsure (portLibrary, buffer, len);
  if (buffer)
    {
      memmove (buffer->data + len, buffer->data, strlen ((char *)(buffer->data)) + 1);
      strncpy ((char *)(buffer->data), string, len);
      buffer->remaining -= len;
    }

  return buffer;
}

char *
strBufferData (HyStringBuffer * buffer)
{
  return buffer ? (char *)(buffer->data) : NULL;
}