1 /* GNU Mailutils -- a suite of utilities for electronic mail 2 Copyright (C) 1999-2021 Free Software Foundation, Inc. 3 4 This library is free software; you can redistribute it and/or 5 modify it under the terms of the GNU Lesser General Public 6 License as published by the Free Software Foundation; either 7 version 3 of the License, or (at your option) any later version. 8 9 This library is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 Lesser General Public License for more details. 13 14 You should have received a copy of the GNU Lesser General 15 Public License along with this library. If not, see 16 <http://www.gnu.org/licenses/>. */ 17 18 #ifdef HAVE_CONFIG_H 19 # include <config.h> 20 #endif 21 22 #include <stdlib.h> 23 #include <mailutils/sys/list.h> 24 #include <mailutils/errno.h> 25 26 int mu_list_prepend(mu_list_t list,void * item)27mu_list_prepend (mu_list_t list, void *item) 28 { 29 struct list_data *ldata; 30 struct list_data *first; 31 32 if (list == NULL) 33 return EINVAL; 34 first = list->head.next; 35 ldata = calloc (sizeof (*ldata), 1); 36 if (ldata == NULL) 37 return ENOMEM; 38 ldata->item = item; 39 mu_monitor_wrlock (list->monitor); 40 ldata->prev = &list->head; 41 ldata->next = list->head.next; 42 first->prev = ldata; 43 list->head.next = ldata; 44 list->count++; 45 mu_monitor_unlock (list->monitor); 46 return 0; 47 } 48