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86d4b528d8
Teach the string-list API how to remove an entry in O(1) runtime by moving the last entry to the vacated spot. As such, the routine works only for unsorted lists. Signed-off-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Elijah Newren <newren@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
196 lines
4.7 KiB
C
196 lines
4.7 KiB
C
#include "cache.h"
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#include "string-list.h"
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/* if there is no exact match, point to the index where the entry could be
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* inserted */
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static int get_entry_index(const struct string_list *list, const char *string,
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int *exact_match)
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{
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int left = -1, right = list->nr;
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while (left + 1 < right) {
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int middle = (left + right) / 2;
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int compare = strcmp(string, list->items[middle].string);
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if (compare < 0)
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right = middle;
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else if (compare > 0)
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left = middle;
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else {
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*exact_match = 1;
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return middle;
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}
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}
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*exact_match = 0;
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return right;
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}
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/* returns -1-index if already exists */
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static int add_entry(int insert_at, struct string_list *list, const char *string)
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{
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int exact_match = 0;
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int index = insert_at != -1 ? insert_at : get_entry_index(list, string, &exact_match);
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if (exact_match)
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return -1 - index;
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if (list->nr + 1 >= list->alloc) {
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list->alloc += 32;
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list->items = xrealloc(list->items, list->alloc
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* sizeof(struct string_list_item));
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}
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if (index < list->nr)
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memmove(list->items + index + 1, list->items + index,
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(list->nr - index)
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* sizeof(struct string_list_item));
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list->items[index].string = list->strdup_strings ?
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xstrdup(string) : (char *)string;
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list->items[index].util = NULL;
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list->nr++;
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return index;
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}
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struct string_list_item *string_list_insert(struct string_list *list, const char *string)
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{
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return string_list_insert_at_index(list, -1, string);
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}
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struct string_list_item *string_list_insert_at_index(struct string_list *list,
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int insert_at, const char *string)
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{
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int index = add_entry(insert_at, list, string);
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if (index < 0)
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index = -1 - index;
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return list->items + index;
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}
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int string_list_has_string(const struct string_list *list, const char *string)
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{
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int exact_match;
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get_entry_index(list, string, &exact_match);
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return exact_match;
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}
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int string_list_find_insert_index(const struct string_list *list, const char *string,
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int negative_existing_index)
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{
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int exact_match;
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int index = get_entry_index(list, string, &exact_match);
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if (exact_match)
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index = -1 - (negative_existing_index ? index : 0);
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return index;
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}
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struct string_list_item *string_list_lookup(struct string_list *list, const char *string)
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{
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int exact_match, i = get_entry_index(list, string, &exact_match);
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if (!exact_match)
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return NULL;
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return list->items + i;
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}
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int for_each_string_list(struct string_list *list,
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string_list_each_func_t fn, void *cb_data)
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{
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int i, ret = 0;
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for (i = 0; i < list->nr; i++)
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if ((ret = fn(&list->items[i], cb_data)))
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break;
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return ret;
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}
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void string_list_clear(struct string_list *list, int free_util)
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{
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if (list->items) {
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int i;
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if (list->strdup_strings) {
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for (i = 0; i < list->nr; i++)
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free(list->items[i].string);
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}
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if (free_util) {
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for (i = 0; i < list->nr; i++)
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free(list->items[i].util);
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}
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free(list->items);
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}
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list->items = NULL;
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list->nr = list->alloc = 0;
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}
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void string_list_clear_func(struct string_list *list, string_list_clear_func_t clearfunc)
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{
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if (list->items) {
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int i;
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if (clearfunc) {
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for (i = 0; i < list->nr; i++)
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clearfunc(list->items[i].util, list->items[i].string);
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}
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if (list->strdup_strings) {
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for (i = 0; i < list->nr; i++)
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free(list->items[i].string);
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}
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free(list->items);
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}
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list->items = NULL;
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list->nr = list->alloc = 0;
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}
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void print_string_list(const struct string_list *p, const char *text)
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{
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int i;
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if ( text )
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printf("%s\n", text);
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for (i = 0; i < p->nr; i++)
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printf("%s:%p\n", p->items[i].string, p->items[i].util);
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}
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struct string_list_item *string_list_append(struct string_list *list, const char *string)
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{
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ALLOC_GROW(list->items, list->nr + 1, list->alloc);
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list->items[list->nr].string =
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list->strdup_strings ? xstrdup(string) : (char *)string;
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list->items[list->nr].util = NULL;
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return list->items + list->nr++;
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}
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static int cmp_items(const void *a, const void *b)
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{
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const struct string_list_item *one = a;
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const struct string_list_item *two = b;
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return strcmp(one->string, two->string);
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}
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void sort_string_list(struct string_list *list)
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{
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qsort(list->items, list->nr, sizeof(*list->items), cmp_items);
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}
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struct string_list_item *unsorted_string_list_lookup(struct string_list *list,
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const char *string)
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{
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int i;
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for (i = 0; i < list->nr; i++)
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if (!strcmp(string, list->items[i].string))
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return list->items + i;
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return NULL;
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}
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int unsorted_string_list_has_string(struct string_list *list,
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const char *string)
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{
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return unsorted_string_list_lookup(list, string) != NULL;
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}
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void unsorted_string_list_delete_item(struct string_list *list, int i, int free_util)
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{
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if (list->strdup_strings)
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free(list->items[i].string);
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if (free_util)
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free(list->items[i].util);
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list->items[i] = list->items[list->nr-1];
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list->nr--;
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}
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