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      1 /*	$NetBSD: tok822_node.c,v 1.2 2017/02/14 01:16:45 christos Exp $	*/
      2 
      3 /*++
      4 /* NAME
      5 /*	tok822_node 3
      6 /* SUMMARY
      7 /*	token memory management
      8 /* SYNOPSIS
      9 /*	#include <tok822.h>
     10 /*
     11 /*	TOK822	*tok822_alloc(type, strval)
     12 /*	int	type;
     13 /*	const char *strval;
     14 /*
     15 /*	TOK822	*tok822_free(tp)
     16 /*	TOK822	*tp;
     17 /* DESCRIPTION
     18 /*	This module implements memory management for token
     19 /*	structures. A distinction is made between single-character
     20 /*	tokens that have no string value, and string-valued tokens.
     21 /*
     22 /*	tok822_alloc() allocates memory for a token structure of
     23 /*	the named type, and initializes it properly. In case of
     24 /*	a single-character token, no string memory is allocated.
     25 /*	Otherwise, \fIstrval\fR is a null pointer or provides
     26 /*	string data to initialize the token with.
     27 /*
     28 /*	tok822_free() releases the memory used for the specified token
     29 /*	and conveniently returns a null pointer value.
     30 /* LICENSE
     31 /* .ad
     32 /* .fi
     33 /*	The Secure Mailer license must be distributed with this software.
     34 /* AUTHOR(S)
     35 /*	Wietse Venema
     36 /*	IBM T.J. Watson Research
     37 /*	P.O. Box 704
     38 /*	Yorktown Heights, NY 10598, USA
     39 /*--*/
     40 
     41 /* System library. */
     42 
     43 #include <sys_defs.h>
     44 #include <string.h>
     45 
     46 /* Utility library. */
     47 
     48 #include <mymalloc.h>
     49 #include <vstring.h>
     50 
     51 /* Global library. */
     52 
     53 #include "tok822.h"
     54 
     55 /* tok822_alloc - allocate and initialize token */
     56 
     57 TOK822 *tok822_alloc(int type, const char *strval)
     58 {
     59     TOK822 *tp;
     60 
     61 #define CONTAINER_TOKEN(x) \
     62 	((x) == TOK822_ADDR || (x) == TOK822_STARTGRP)
     63 
     64     tp = (TOK822 *) mymalloc(sizeof(*tp));
     65     tp->type = type;
     66     tp->next = tp->prev = tp->head = tp->tail = tp->owner = 0;
     67     tp->vstr = (type < TOK822_MINTOK || CONTAINER_TOKEN(type) ? 0 :
     68 		strval == 0 ? vstring_alloc(10) :
     69 		vstring_strcpy(vstring_alloc(strlen(strval) + 1), strval));
     70     return (tp);
     71 }
     72 
     73 /* tok822_free - destroy token */
     74 
     75 TOK822 *tok822_free(TOK822 *tp)
     76 {
     77     if (tp->vstr)
     78 	vstring_free(tp->vstr);
     79     myfree((void *) tp);
     80     return (0);
     81 }
     82