diff options
author | Nathan Angelacos <nangel@alpinelinux.org> | 2008-05-12 22:01:20 +0000 |
---|---|---|
committer | Nathan Angelacos <nangel@alpinelinux.org> | 2008-05-12 22:01:20 +0000 |
commit | bb899c9dda1b0e7d317b89ee5bdca96b3d499c4d (patch) | |
tree | f1f5bb52778093248719432c9f5a75b4564391d8 /src | |
parent | b91a4a4d1ac83161e78645a987fe168eb1df220b (diff) | |
download | haserl-bb899c9dda1b0e7d317b89ee5bdca96b3d499c4d.tar.bz2 haserl-bb899c9dda1b0e7d317b89ee5bdca96b3d499c4d.tar.xz |
llist from busybox
Diffstat (limited to 'src')
-rw-r--r-- | src/llist.c | 123 | ||||
-rw-r--r-- | src/llist.h | 9 | ||||
-rw-r--r-- | src/xmalloc.c | 45 | ||||
-rw-r--r-- | src/xmalloc.h | 8 |
4 files changed, 180 insertions, 5 deletions
diff --git a/src/llist.c b/src/llist.c new file mode 100644 index 0000000..48d01fa --- /dev/null +++ b/src/llist.c @@ -0,0 +1,123 @@ +/* vi: set sw=4 ts=4: */ +/* + * linked list helper functions. + * + * Copyright (C) 2003 Glenn McGrath + * Copyright (C) 2005 Vladimir Oleynik + * Copyright (C) 2005 Bernhard Fischer + * Copyright (C) 2006 Rob Landley <rob@landley.net> + * + * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. + * + * haserl uses busybox's libbb functions where appropriate because + * a (very long-term) goal is to get it to be a bb applet. + */ + +#include "llist.h" + +/* Add data to the start of the linked list. */ +void +llist_add_to (llist_t ** old_head, void *data) +{ + llist_t *new_head = xmalloc (sizeof (llist_t)); + + new_head->data = data; + new_head->link = *old_head; + *old_head = new_head; +} + +/* Add data to the end of the linked list. */ +void +llist_add_to_end (llist_t ** list_head, void *data) +{ + llist_t *new_item = xmalloc (sizeof (llist_t)); + + new_item->data = data; + new_item->link = NULL; + + if (!*list_head) + *list_head = new_item; + else + { + llist_t *tail = *list_head; + + while (tail->link) + tail = tail->link; + tail->link = new_item; + } +} + +/* Remove first element from the list and return it */ +void * +llist_pop (llist_t ** head) +{ + void *data, *next; + + if (!*head) + return NULL; + + data = (*head)->data; + next = (*head)->link; + free (*head); + *head = next; + + return data; +} + +/* Unlink arbitrary given element from the list */ +void +llist_unlink (llist_t ** head, llist_t * elm) +{ + llist_t *crt; + + if (!(elm && *head)) + return; + + if (elm == *head) + { + *head = (*head)->link; + return; + } + + for (crt = *head; crt; crt = crt->link) + { + if (crt->link == elm) + { + crt->link = elm->link; + return; + } + } +} + +/* Recursively free all elements in the linked list. If freeit != NULL + * call it on each datum in the list */ +void +llist_free (llist_t * elm, void (*freeit) (void *data)) +{ + while (elm) + { + void *data = llist_pop (&elm); + + if (freeit) + freeit (data); + } +} + +#ifdef UNUSED +/* Reverse list order. */ +llist_t * +llist_rev (llist_t * list) +{ + llist_t *rev = NULL; + + while (list) + { + llist_t *next = list->link; + + list->link = rev; + rev = list; + list = next; + } + return rev; +} +#endif diff --git a/src/llist.h b/src/llist.h index 03c4e88..0f75942 100644 --- a/src/llist.h +++ b/src/llist.h @@ -1,9 +1,8 @@ /* - * Linked List functions, should be api compatible with Busybox - * These are the function declarations from the libbb.h file + * Linked List functions from lib busybox */ -#ifndef _LLIST_H -#define _LLIST_H 1 +#ifndef X_LLIST_H +#define X_LLIST_H 1 typedef struct llist_t { char *data; @@ -17,4 +16,4 @@ void llist_unlink(llist_t **head, llist_t *elm); void llist_free(llist_t *elm, void (*freeit)(void *data)); -#endif /* LLIST_H */ +#endif /* X_LLIST_H */ diff --git a/src/xmalloc.c b/src/xmalloc.c new file mode 100644 index 0000000..ced7820 --- /dev/null +++ b/src/xmalloc.c @@ -0,0 +1,45 @@ +/* -------------------------------------------------------------------------- + * xmalloc definition - allocate or die + * Copyright (c) 2008 Nathan Angelacos (nangel@users.sourceforge.net) + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License, version 2, as published + * by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * + ------------------------------------------------------------------------- */ + +#include <stdlib.h> + +void * +xmalloc (size_t size) +{ + void *buf; + buf = malloc (size); + if ((buf == NULL) && (size > 0)) + { + abort (); + } + return buf; +} + + +void * +xrealloc (void *buf, size_t size) +{ + buf = realloc (buf, size); + if ((buf == NULL) && (size > 0)) + { + abort (); + } + return buf; +} diff --git a/src/xmalloc.h b/src/xmalloc.h new file mode 100644 index 0000000..dd26560 --- /dev/null +++ b/src/xmalloc.h @@ -0,0 +1,8 @@ +#ifndef XMALLOC_H +#define XMALLOC_H 1 + +void *xmalloc (size_t size); +void *xrealloc (void *buf, size_t size); + +#endif /* XMALLOC_H */ + |