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{
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{
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   // this function writes the content of data to a buffer's data at position write_index.
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   // this function writes the content of data to a buffer's data at position write_index.
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   // Returns 1 on success, 0 on error.
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   // Returns 1 on success, 0 on error.
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   char *new_data;
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   char *new_data;
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   char *dest;
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   // see if we need to grow the data
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   // see if we need to grow the data
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   if (write_index + data_size > buffer->size)
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   if (write_index + data_size > buffer->size)
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   {
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   {
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      // if so, reallocate data buffer at the right size
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      // if so, reallocate data buffer at the right size
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         return (0); // on failure, return an error value
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         return (0); // on failure, return an error value
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      buffer->data = new_data; // save pointer to reallocated data
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      buffer->data = new_data; // save pointer to reallocated data
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   }
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   }
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   // do dest and source overlap ?
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   dest = &buffer->data[write_index];
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   if (((data <= dest) && (data + data_size > dest)) || ((dest <= data) && (dest + data_size > data)))
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      memmove (&buffer->data[write_index], data, data_size); // if so, move data in place
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   else
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   memcpy (&buffer->data[write_index], data, data_size); // write data in place
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      memcpy (&buffer->data[write_index], data, data_size); // else write data in place (faster)
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   if (write_index + data_size > buffer->size)
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   if (write_index + data_size > buffer->size)
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      buffer->size = write_index + data_size; // update data size only if it growed
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      buffer->size = write_index + data_size; // update data size only if it growed
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   return (1); // buffer written successfully, return SUCCESS
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   return (1); // buffer written successfully, return SUCCESS
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}
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}