release/src/router/apcupsd/src/lib/apclist.c

   1 /*
   2  * apclist.c
   3  *
   4  * UPS linked list functions.
   5  */
   6
   7 /*
   8  * Copyright (C) 1996-99 Andre M. Hedrick <andre@suse.com>
   9  * Copyright (C) 1999-2001 Riccardo Facchetti <riccardo@master.oasi.gpa.it>
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of version 2 of the GNU General
  13  * Public License as published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the Free
  22  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  23  * MA 02111-1307, USA.
  24  */
  25
  26 #include "apc.h"
  27
  28 static UPSINFO *upshead = NULL;
  29
  30 /*
  31  * The linked list need to be defined in _all_ the forked processes.
  32  * The syncronization of data into this structure is done with the shared
  33  * memory area so this is made reentrant by the shm mechanics.
  34  */
  35
  36 int insertUps(UPSINFO *ups)
  37 {
  38    UPSINFO *ptr = upshead;
  39
  40    if (ptr == NULL) {
  41       upshead = ups;
  42    } else {
  43       while (ptr->next)
  44          ptr = ptr->next;
  45       ptr->next = ups;
  46    }
  47
  48    return SUCCESS;
  49 }
  50
  51 UPSINFO *getNextUps(UPSINFO *ups)
  52 {
  53    if (ups == NULL)
  54       return upshead;
  55
  56    return ups->next;
  57 }
  58
  59 UPSINFO *getUpsByname(char *name)
  60 {
  61    UPSINFO *ups = NULL;
  62
  63    for (ups = NULL; (ups = getNextUps(ups)) != NULL;) {
  64       if (strncmp(name, ups->upsname, strlen(ups->upsname)) == 0)
  65          return ups;
  66    }
  67
  68    return NULL;
  69 }