Function set_field_buffer

Source/CursesDialog/form/frm_driver.c:3778–3865

--------------------------------------------------------------------------- | Facility : libnform | Function : int set_field_buffer(FIELD *field, | int buffer, char *value) | | Description : Set the given buffer of the field to the given value. | Buffer 0 stores the displayed content of the field. |

  Field-Buffer manipulation routines.
  The effects of setting a buffer is tightly coupled to the core of the form
  driver logic. This is especially true in the case of growable fields.
  So I don't separate this into an own module. 
  --------------------------------------------------------------------------*/

/*---------------------------------------------------------------------------
|   Facility      :  libnform  
|   Function      :  int set_field_buffer(FIELD *field,
|                                         int buffer, char *value)
|   
|   Description   :  Set the given buffer of the field to the given value.
|                    Buffer 0 stores the displayed content of the field.
|                    For dynamic fields this may grow the fieldbuffers if
|                    the length of the value exceeds the current buffer
|                    length. For buffer 0 only printable values are allowed.
|                    For static fields, the value needs not to be zero ter-
|                    minated. It is copied up to the length of the buffer.   
|
|   Return Values :  E_OK            - success
|                    E_BAD_ARGUMENT  - invalid argument
|                    E_SYSTEM_ERROR  - system error
+--------------------------------------------------------------------------*/
int set_field_buffer(FIELD * field, int buffer, const char * value)
{
  char *s, *p;
  int res = E_OK;
  unsigned int len;

  if ( !field || !value || ((buffer < 0)||(buffer > field->nbuf)) )
    RETURN(E_BAD_ARGUMENT);

  len  = Buffer_Length(field);

  if (buffer==0)
    {
      const char *v;
      unsigned int i = 0;

      for(v=value; *v && (i<len); v++,i++)
        {
          if (!isprint((unsigned char)*v))
            RETURN(E_BAD_ARGUMENT);
        }
    }

  if (Growable(field))
    {
      /* for a growable field we must assume zero terminated strings, because
         somehow we have to detect the length of what should be copied.
      */
      unsigned int vlen = strlen(value);
      if (vlen > len)
        {
          if (!Field_Grown(field,
                           (int)(1 + (vlen-len)/((field->rows+field->nrow)*field->cols))))
            RETURN(E_SYSTEM_ERROR);

          /* in this case we also have to check, whether or not the remaining
             characters in value are also printable for buffer 0. */