1/* $NetBSD$ */ 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 57TOK822 *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 75TOK822 *tok822_free(TOK822 *tp) 76{ 77 if (tp->vstr) 78 vstring_free(tp->vstr); 79 myfree((char *) tp); 80 return (0); 81} 82