136 lines
3.4 KiB
C
136 lines
3.4 KiB
C
/* list.c - Functions for manipulating linked lists of objects. */
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/* Copyright (C) 1996-2009 Free Software Foundation, Inc.
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This file is part of GNU Bash, the Bourne Again SHell.
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Bash is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Bash is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Bash. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#if defined (HAVE_UNISTD_H)
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# ifdef _MINIX
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# include <sys/types.h>
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# endif
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# include <unistd.h>
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#endif
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#include "shell.h"
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/* A global variable which acts as a sentinel for an `error' list return. */
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GENERIC_LIST global_error_list;
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#ifdef INCLUDE_UNUSED
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/* Call FUNCTION on every member of LIST, a generic list. */
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void
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list_walk (list, function)
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GENERIC_LIST *list;
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sh_glist_func_t *function;
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{
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for ( ; list; list = list->next)
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if ((*function) (list) < 0)
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return;
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}
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/* Call FUNCTION on every string in WORDS. */
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void
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wlist_walk (words, function)
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WORD_LIST *words;
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sh_icpfunc_t *function;
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{
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for ( ; words; words = words->next)
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if ((*function) (words->word->word) < 0)
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return;
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}
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#endif /* INCLUDE_UNUSED */
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/* Reverse the chain of structures in LIST. Output the new head
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of the chain. You should always assign the output value of this
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function to something, or you will lose the chain. */
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GENERIC_LIST *
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list_reverse (list)
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GENERIC_LIST *list;
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{
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register GENERIC_LIST *next, *prev;
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for (prev = (GENERIC_LIST *)NULL; list; )
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{
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next = list->next;
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list->next = prev;
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prev = list;
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list = next;
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}
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return (prev);
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}
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/* Return the number of elements in LIST, a generic list. */
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int
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list_length (list)
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GENERIC_LIST *list;
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{
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register int i;
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for (i = 0; list; list = list->next, i++);
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return (i);
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}
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/* Append TAIL to HEAD. Return the header of the list. */
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GENERIC_LIST *
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list_append (head, tail)
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GENERIC_LIST *head, *tail;
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{
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register GENERIC_LIST *t_head;
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if (head == 0)
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return (tail);
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for (t_head = head; t_head->next; t_head = t_head->next)
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;
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t_head->next = tail;
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return (head);
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}
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#ifdef INCLUDE_UNUSED
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/* Delete the element of LIST which satisfies the predicate function COMPARER.
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Returns the element that was deleted, so you can dispose of it, or -1 if
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the element wasn't found. COMPARER is called with the list element and
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then ARG. Note that LIST contains the address of a variable which points
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to the list. You might call this function like this:
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SHELL_VAR *elt = list_remove (&variable_list, check_var_has_name, "foo");
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dispose_variable (elt);
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*/
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GENERIC_LIST *
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list_remove (list, comparer, arg)
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GENERIC_LIST **list;
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Function *comparer;
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char *arg;
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{
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register GENERIC_LIST *prev, *temp;
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for (prev = (GENERIC_LIST *)NULL, temp = *list; temp; prev = temp, temp = temp->next)
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{
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if ((*comparer) (temp, arg))
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{
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if (prev)
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prev->next = temp->next;
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else
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*list = temp->next;
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return (temp);
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}
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}
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return ((GENERIC_LIST *)&global_error_list);
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}
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#endif
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