Function extractStr

wiringPi/wpiExtensions.c:147–193

 */

static char *extractStr (char *progName, char *p, char **str)
{
  char *q, *r ;
  int quoted = false ;

  if (*p != ':')
  {
    verbError ("%s: colon expected", progName) ;
    return NULL ;
  }

  ++p ;

  if (*p == '[')
  {
    quoted = true ;
    ++p ;
  }

  if (!isprint (*p))	// Is this needed?
  {
    verbError ("%s: character expected", progName) ;
    return NULL ;
  }

  q = p ;
  if (quoted)
  {
    while ((*q != 0) && (*q != ']'))
      ++q ;
  }
  else
  {
    while ((*q != 0) && (*q != ':'))
      ++q ;
  }

  *str = r = calloc (q - p + 2, 1) ;	// Zeros it

  while (p != q)
    *r++ = *p++ ;

  if (quoted)				// Skip over the ] to the :
    ++p ;

  return p ;
}