vlalloc.c

sock5代理服务器源代码

/*                                                                           */
/*  * Copyright (c) 1989, 1990, 1991 by the University of Washington         */
/*  *                                                                        */
/*  * For copying and distribution information, please see the file          */
/*  * <copyright.h>.                                                         */

#include <stdio.h>

#include <pfs.h>
#include <pmachine.h>

static VLINK	lfree = NULL;
int		vlink_count = 0;
int		vlink_max = 0;

/*                                                                           */
/*  * vlalloc - allocate and initialize vlink structure                      */
/*  *                                                                        */
/*  * VLALLOC returns a pointer to an initialized structure of type          */
/*  * VLINK.  If it is unable to allocate such a structure, it               */
/*  * returns NULL.                                                          */
VLINK
vlalloc()
    {
	VLINK	vl;
	if(lfree) {
	    vl = lfree;
	    lfree = lfree->next;
	}
	else {
	    vl = (VLINK) malloc(sizeof(VLINK_ST));
	    if (!vl) return(NULL);
	    vlink_max++;
	}

	vlink_count++;

	/* Initialize and fill in default values Since all but four are set  */
	/* to a zero-value,                                                  */
	/* 	   why not just wipe it clean?                               */
	ZERO(vl);

	vl->linktype = 'L';
	vl->type = stcopy("FILE");
	vl->hosttype = stcopy("INTERNET-D");
	vl->nametype = stcopy("ASCII");

	return(vl);
    }

/*                                                                           */
/*  * vlfree - free a VLINK structure                                        */
/*  *                                                                        */
/*  * VLFREE takes a pointer to a VLINK structure and adds it to             */
/*  * the free list for later reuse.                                         */
void
vlfree(vl)
    VLINK	vl;
    {
        extern int string_count;

	if(vl->dontfree) return;
	/* many of these don't need to call stfree(); since a check for      */
	/* pointer validity's already done before even calling it, we can    */
	/* just call free() here then do one big decrement of string_count   */
	/* at the end.                                                       */
	if(vl->name) free(vl->name);
	stfree(vl->type);
	if(vl->replicas) vllfree(vl->replicas);
	stfree(vl->hosttype);
	if(vl->host) free(vl->host);
	stfree(vl->nametype);
	if(vl->filename) free(vl->filename);
	if(vl->args) free(vl->args);
	if(vl->lattrib) atlfree(vl->lattrib);

	/* No allocation routines for f_info yet                             */
	vl->f_info = NULL;
	vl->next = lfree;
	vl->previous = NULL;
	lfree = vl;
	vlink_count--;
	string_count -= 4; /* freed name, host, filename, and args           */
    }

/*                                                                           */
/*  * vllfree - free a VLINK structure                                       */
/*  *                                                                        */
/*  * VLLFREE takes a pointer to a VLINK structure frees it and any linked   */
/*  * VLINK structures.  It is used to free an entrie list of VLINK          */
/*  * structures.                                                            */
void
vllfree(vl)
    VLINK	vl;
    {
	VLINK	nxt;

	while((vl != NULL) && !vl->dontfree) {
	    nxt = vl->next;
	    vlfree(vl);
	    vl = nxt;
	}
    }