/*

  * Copyright (C) 2016  J. Ali Harlow <ali@juiblex.co.uk>

  *

  * This program is free software; you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation; either version 2 of the License, or

  * (at your option) any later version.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License along

  * with this program; if not, write to the Free Software Foundation, Inc.,

  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

  */

 #define is_alpha(c)	  ((c) >= 'a' && (c) <= 'z' || (c) >= 'A' && (c) <= 'Z')

 #define is_alnum(c)	  (is_alpha(c) || (c) >= '0' && (c) <= '9')

 #define is_xdigit(c)	  ((c) >= '0' && (c) <= '9' || \

 			   (c) >= 'a' && (c) <= 'f' || \

 			   (c) >= 'A' && (c) <= 'F')

 #define is_unreserved(c)  (is_alnum(c) || (c) == '-' || (c) == '.' || \

 			   (c) == '_' || (c) == '~')

 #define is_sub_delim(c)	  strchr("!$&'()*+,;=", c)

 #define is_pchar(c)	  (is_unreserved(c) || (c) == '%' || \

 			   is_sub_delim(c) || (c) == ':' || (c) == '@')

 #define xdigit_value(c)	  ((c) >= '0' && (c) <= '9' ? (c) - '0' : \

 			   (c) >= 'a' && (c) <= 'f' ? (c) - 'a' + 10 : \

 			   (c) >= 'A' && (c) <= 'F' ? (c) - 'A' + 10 : -1)

 #define pchar_get_char(p) ((p)[0] == '%' ? \

 			   xdigit_value((p)[1]) * 16 + xdigit_value((p)[2]) : \

 			   (p)[0])

 #define pchar_next_char(p) \

 	    do { \

 		    if ((p)[0] == '%') \

 			    (p) += 3; \

 		    else \

 			    (p)++; \

 	    } while(0)