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-rw-r--r--lib/libalpm/alpm_list.c429
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diff --git a/lib/libalpm/alpm_list.c b/lib/libalpm/alpm_list.c
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+/*
+ * alpm_list.c
+ *
+ * Copyright (c) 2002-2006 by Judd Vinet <jvinet@zeroflux.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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 "config.h"
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <assert.h>
+
+#include "alpm_list.h"
+#include "util.h"
+
+/** \defgroup alpm_list functions */
+/*\@{*/
+
+/* Allocation */
+
+/** Allocate a new alpm_list_t
+ * @return a new alpm_list_t item, or NULL on failure
+ */
+alpm_list_t *alpm_list_new()
+{
+ alpm_list_t *list = NULL;
+
+ list = (alpm_list_t *)malloc(sizeof(alpm_list_t));
+ if(list) {
+ list->data = NULL;
+ list->prev = NULL;
+ list->next = NULL;
+ }
+ return(list);
+}
+
+/** Free a list structure and possibly the internal data as well
+ * @param list the list to free
+ * @param fn a free function for the internal data, or NULL for none
+ */
+void alpm_list_free(alpm_list_t *list, alpm_list_fn_free fn)
+{
+ alpm_list_t *it = list;
+
+ while(it) {
+ alpm_list_t *ptr = it->next;
+ if(fn && it->data) {
+ fn(it->data);
+ }
+ FREE(it);
+ it = ptr;
+ }
+}
+
+/** Free the outer list, but not the contained data
+ * A minor simplification of alpm_list_free
+ * @param list the list to free
+ */
+void alpm_list_free_outer(alpm_list_t *list)
+{
+ alpm_list_free(list, NULL);
+}
+
+/* Mutators */
+
+/** Add a new item to the list
+ * @param list the list to add to
+ * @param data the new item to be added to the list
+ * @return the resultant list, or NULL on failure
+ */
+alpm_list_t *alpm_list_add(alpm_list_t *list, void *data)
+{
+ alpm_list_t *ptr, *lp;
+
+ ptr = list;
+ if(ptr == NULL) {
+ ptr = alpm_list_new();
+ if(ptr == NULL) {
+ return(NULL);
+ }
+ }
+
+ lp = alpm_list_last(ptr);
+ if(lp == ptr && lp->data == NULL) {
+ /* nada */
+ } else {
+ lp->next = alpm_list_new();
+ if(lp->next == NULL) {
+ return(NULL);
+ }
+ lp->next->prev = lp;
+ lp = lp->next;
+ }
+
+ lp->data = data;
+
+ return(ptr);
+}
+
+/** Add items to a list in sorted order.
+ * @param list the list to add to
+ * @param data the new item to be added to the list
+ * @param fn the comparison function to use to determine order
+ * @return the resultant list, or NULL on failure
+ */
+alpm_list_t *alpm_list_add_sorted(alpm_list_t *list, void *data, alpm_list_fn_cmp fn)
+{
+ if(!fn) {
+ return alpm_list_add(list, data);
+ } else {
+ alpm_list_t *add = NULL, *prev = NULL, *next = list;
+
+ add = alpm_list_new();
+ add->data = data;
+
+ /* Find insertion point. */
+ while(next) {
+ if(fn(add->data, next->data) <= 0) break;
+ prev = next;
+ next = next->next;
+ }
+
+ /* Insert node before insertion point. */
+ add->prev = prev;
+ add->next = next;
+
+ if(next != NULL) {
+ next->prev = add; /* Not at end. */
+ }
+
+ if(prev != NULL) {
+ prev->next = add; /* In middle. */
+ }
+
+ return(list);
+ }
+}
+
+/** Merge the two sorted sublists into one sorted list
+ * @param left the first list
+ * @param right the second list
+ * @param fn comparison function for determining merge order
+ */
+alpm_list_t *alpm_list_mmerge(alpm_list_t *left, alpm_list_t *right, alpm_list_fn_cmp fn)
+{
+ alpm_list_t *newlist, *lp;
+
+ if (left == NULL)
+ return right;
+ if (right == NULL)
+ return left;
+
+ if (fn(left->data, right->data) <= 0) {
+ newlist = left;
+ left = left->next;
+ }
+ else {
+ newlist = right;
+ right = right->next;
+ }
+ newlist->prev = NULL;
+ newlist->next = NULL;
+ lp = newlist;
+
+ while ((left != NULL) && (right != NULL)) {
+ if (fn(left->data, right->data) <= 0) {
+ lp->next = left;
+ left->prev = lp;
+ left = left->next;
+ }
+ else {
+ lp->next = right;
+ right->prev = lp;
+ right = right->next;
+ }
+ lp = lp->next;
+ lp->next = NULL;
+ }
+ if (left != NULL) {
+ lp->next = left;
+ left->prev = lp;
+ }
+ else if (right != NULL) {
+ lp->next = right;
+ right->prev = lp;
+ }
+ return(newlist);
+}
+
+/** Sort a list of size `n` using mergesort algorithm
+ * @param list the list to sort
+ * @param n the size of the list
+ * @param fn the comparison function for determining order
+ */
+alpm_list_t* alpm_list_msort(alpm_list_t *list, int n, alpm_list_fn_cmp fn)
+{
+ if (n > 1) {
+ alpm_list_t *left = list;
+ alpm_list_t *lastleft = alpm_list_nth(list, n/2 - 1);
+ alpm_list_t *right = lastleft->next;
+ /* terminate first list */
+ lastleft->next = NULL;
+
+ left = alpm_list_msort(left, n/2, fn);
+ right = alpm_list_msort(right, n - (n/2), fn);
+ list = alpm_list_mmerge(left, right, fn);
+ }
+ return(list);
+}
+
+/** Remove an item from the list
+ * @param haystack the list to remove the item from
+ * @param needle the data member of the item we're removing
+ * @param fn the comparison function for searching
+ * @param data output parameter containing the data member of the item removed
+ * @return the resultant list, or NULL on failure
+ */
+alpm_list_t *alpm_list_remove(alpm_list_t *haystack, void *needle, alpm_list_fn_cmp fn, void **data)
+{ /* TODO I modified this to remove ALL matching items. Do we need a remove_first? */
+ alpm_list_t *i = haystack, *tmp = NULL;
+
+ if(data) {
+ *data = NULL;
+ }
+
+ while(i) {
+ if(i->data == NULL) {
+ continue;
+ }
+ tmp = i->next;
+ if(fn(needle, i->data) == 0) {
+ /* we found a matching item */
+ if(i->next) {
+ i->next->prev = i->prev;
+ }
+ if(i->prev) {
+ i->prev->next = i->next;
+ }
+
+ if(i == haystack) {
+ /* The item found is the first in the chain */
+ haystack = haystack->next;
+ }
+
+ if(data) {
+ *data = i->data;
+ }
+ i->data = NULL;
+ free(i);
+ }
+ i = tmp;
+ }
+
+ return(haystack);
+}
+
+/** Create a new list without any duplicates
+ * @note DOES NOT copy data members
+ * @param list the list to copy
+ * @return a NEW list containing non-duplicated items
+ */
+alpm_list_t *alpm_list_remove_dupes(alpm_list_t *list)
+{ /* TODO does removing the strdup here cause invalid free's anywhere? */
+ alpm_list_t *lp = list, *newlist = NULL;
+ while(lp) {
+ if(!alpm_list_is_in(lp->data, newlist)) {
+ newlist = alpm_list_add(newlist, lp->data);
+ }
+ lp = lp->next;
+ }
+ return(newlist);
+}
+
+/** Copy a string list, including data
+ * @note this is gross, assumes string data members
+ * @param list the list to copy
+ * @return a copy of the original list
+ */
+alpm_list_t *alpm_list_strdup(alpm_list_t *list)
+{
+ alpm_list_t *lp = list, *newlist = NULL;
+ while(lp) {
+ newlist = alpm_list_add(newlist, strdup(lp->data));
+ lp = lp->next;
+ }
+ return(newlist);
+}
+
+/** Create a new list in reverse order
+ * @param list the list to copy
+ * @return a NEW list in reverse order of the first
+ */
+alpm_list_t *alpm_list_reverse(alpm_list_t *list)
+{ /* TODO any invalid free's from NOT duplicating data here? */
+ alpm_list_t *lp, *newlist = NULL;
+
+ lp = alpm_list_last(list);
+ while(lp) {
+ newlist = alpm_list_add(newlist, lp->data);
+ lp = lp->prev;
+ }
+ return(newlist);
+}
+
+/* Accessors */
+
+/** Get the first element of a list.
+ * @param list the list
+ * @return the first element in the list
+ */
+alpm_list_t *alpm_list_first(alpm_list_t *list)
+{
+ return(list);
+}
+
+/** Return nth element from list (starting with 0)
+ * @param list the list to access
+ * @param n the index of the item to find
+ * @return an alpm_list_t node for index `n`
+ */
+alpm_list_t *alpm_list_nth(alpm_list_t *list, int n)
+{
+ alpm_list_t *i = list;
+ while(n--) {
+ i = i->next;
+ }
+ return(i);
+}
+
+/** Get the next element of a list.
+ * @param entry the list entry
+ * @return the next element, or NULL when no more elements exist
+ */
+alpm_list_t *alpm_list_next(alpm_list_t *entry)
+{
+ return(entry->next);
+}
+/** Get the last item in the list.
+ * @param list the list to operate on
+ * @return the last element in the list
+ */
+alpm_list_t *alpm_list_last(alpm_list_t *list)
+{
+ alpm_list_t *i = list;
+ while(i && i->next) {
+ i = i->next;
+ }
+ return(i);
+}
+
+/** Get the data member of a list entry.
+ * @param entry the list entry
+ * @return the contained data, or NULL if none
+ */
+void *alpm_list_getdata(const alpm_list_t *entry)
+{
+ return(entry->data);
+}
+
+/* Misc */
+
+/** Count the list items
+ * @param list the list to operate on
+ * @return the number of list items
+ */
+int alpm_list_count(const alpm_list_t *list)
+{
+ unsigned int i = 0;
+ const alpm_list_t *lp = list;
+ while(lp) {
+ ++i;
+ lp = lp->next;
+ }
+ return(i);
+}
+
+/** Is an item in the list
+ * @param needle the data to compare to (== comparison)
+ * @param haystack the list to search
+ * @return 1 if `needle` is found, 0 otherwise
+ */
+int alpm_list_is_in(const void *needle, alpm_list_t *haystack)
+{
+ alpm_list_t *lp = haystack;
+ while(lp) {
+ if(lp->data == needle) {
+ return(1);
+ }
+ lp = lp->next;
+ }
+ return(0);
+}
+
+/* Test for existence of a string in a alpm_list_t
+*/
+/** Is a _string_ in the list (optimization of alpm_list_is_in for strings)
+ * @param needle the string to compare
+ * @param haystack the list to search
+ * @return 1 if `needle` is found, 0 otherwise
+ */
+int alpm_list_is_strin(const char *needle, alpm_list_t *haystack)
+{
+ alpm_list_t *lp = haystack;
+ while(lp) {
+ if(lp->data && strcmp((const char *)lp->data, needle) == 0) {
+ return(1);
+ }
+ }
+ return(0);
+}
+
+/** @} */
+
+/* vim: set ts=2 sw=2 noet: */