Function ipp_set_value

cups/ipp.c:6711–6837

 */

static _ipp_value_t *			/* O  - IPP value element or NULL on error */
ipp_set_value(ipp_t           *ipp,	/* IO - IPP message */
              ipp_attribute_t **attr,	/* IO - IPP attribute */
              int             element)	/* I  - Value number (0-based) */
{
  ipp_attribute_t	*temp,		/* New attribute pointer */
			*current,	/* Current attribute in list */
			*prev;		/* Previous attribute in list */
  int			alloc_values;	/* Allocated values */


 /*
  * If we are setting an existing value element, return it...
  */

  temp = *attr;

  if (temp->num_values <= 1)
    alloc_values = 1;
  else
    alloc_values = (temp->num_values + IPP_MAX_VALUES - 1) &
                   ~(IPP_MAX_VALUES - 1);

  if (element < alloc_values)
  {
    if (element >= temp->num_values)
      temp->num_values = element + 1;

    return (temp->values + element);
  }

 /*
  * Otherwise re-allocate the attribute - we allocate in groups of IPP_MAX_VALUE
  * values when num_values > 1.
  */

  if (alloc_values < IPP_MAX_VALUES)
    alloc_values = IPP_MAX_VALUES;
  else
    alloc_values += IPP_MAX_VALUES;

  DEBUG_printf(("4ipp_set_value: Reallocating for up to %d values.",
                alloc_values));

 /*
  * Reallocate memory...
  */

  if ((temp = realloc(temp, sizeof(ipp_attribute_t) + (size_t)(alloc_values - 1) * sizeof(_ipp_value_t))) == NULL)
  {
    _cupsSetError(IPP_STATUS_ERROR_INTERNAL, _("Unable to reallocate IPP attribute value."), 1);
    DEBUG_puts("4ipp_set_value: Unable to resize attribute.");
    return (NULL);
  }

 /*
  * Zero the new memory...
  */