snap_list.c

一个学习SNMP项目：tmoerlan.

/* snap-1.0. Copyright (C) 2000 by Jonathan T. Moore and Michael Hicks.
 *
 * list.c : routines for manipulating SNAP lists
 *
 * $Id: snap_list.c,v 1.2 2003/09/17 11:26:10 tmoerlan Exp $
 */

#ifdef __KERNEL__
#include <linux/slab.h>
#include <snap/list.h>
#else
#include "list.h"
#include "memalloc.h"
#endif /* __KERNEL__ */

#ifndef _SNAP_LIST_T
typedef struct l {
  void *v;
  struct l *next;
} list_t;
#define _SNAP_LIST_T
#endif /* !_SNAP_LIST_T */

list_t *cons(void *v, list_t *next) {
  list_t *cell;
  
#ifdef __KERNEL__
  cell = (list_t *)kmalloc(sizeof(list_t),GFP_ATOMIC);
  if (!cell) {
    printk(KERN_WARNING "%s:%d: kmalloc failed\n",__FILE__,__LINE__);
    return NULL;
  }
#else
  memalloc(cell,list_t *,sizeof(list_t));
#endif /* __KERNEL__ */
  cell->v = v;
  cell->next = next;
  return cell;
}

void free_list(list_t *list) {
  list_t *iter = list, *tmp;
  while (iter != NULL) {
    tmp = iter;
#ifdef __KERNEL__
    kfree(iter);
#else
    free(iter);
#endif /* __KERNEL__ */
    iter = tmp->next;
  }
}

int length_list(list_t *list) {
  int i = 0;
  list_t *iter = list;
  while (iter != NULL) {
    i++;
    iter = iter->next;
  }
  return i;
}