rem: if (c != *(unsigned char *)p)
add: unsigned char pc = *p; if (c != pc)
context: get_prefix (FILE *f){  register int c;  in_column = 0;  c = get_space (f, getc (f));  if (prefix_length == 0)    next_prefix_indent = prefix_lead_space < in_column ?      prefix_lead_space : in_column;  else    {      const char *p;      next_prefix_indent = in_column;      for (p = prefix; *p != '\0'; p++)	{	  if (c != *(unsigned char *)p)	    return c;	  in_column++;	  c = getc (f);	}      c = get_space (f, c);    }  return c;}