mirror of
https://github.com/git/git
synced 2024-08-24 18:26:02 +00:00
![Johannes Sixt](/assets/img/avatar_default.png)
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>
197 lines
4.7 KiB
C
197 lines
4.7 KiB
C
#include "cache.h"
|
|
#include "string-list.h"
|
|
|
|
/* if there is no exact match, point to the index where the entry could be
|
|
* inserted */
|
|
static int get_entry_index(const struct string_list *list, const char *string,
|
|
int *exact_match)
|
|
{
|
|
int left = -1, right = list->nr;
|
|
|
|
while (left + 1 < right) {
|
|
int middle = (left + right) / 2;
|
|
int compare = strcmp(string, list->items[middle].string);
|
|
if (compare < 0)
|
|
right = middle;
|
|
else if (compare > 0)
|
|
left = middle;
|
|
else {
|
|
*exact_match = 1;
|
|
return middle;
|
|
}
|
|
}
|
|
|
|
*exact_match = 0;
|
|
return right;
|
|
}
|
|
|
|
/* returns -1-index if already exists */
|
|
static int add_entry(int insert_at, struct string_list *list, const char *string)
|
|
{
|
|
int exact_match = 0;
|
|
int index = insert_at != -1 ? insert_at : get_entry_index(list, string, &exact_match);
|
|
|
|
if (exact_match)
|
|
return -1 - index;
|
|
|
|
if (list->nr + 1 >= list->alloc) {
|
|
list->alloc += 32;
|
|
list->items = xrealloc(list->items, list->alloc
|
|
* sizeof(struct string_list_item));
|
|
}
|
|
if (index < list->nr)
|
|
memmove(list->items + index + 1, list->items + index,
|
|
(list->nr - index)
|
|
* sizeof(struct string_list_item));
|
|
list->items[index].string = list->strdup_strings ?
|
|
xstrdup(string) : (char *)string;
|
|
list->items[index].util = NULL;
|
|
list->nr++;
|
|
|
|
return index;
|
|
}
|
|
|
|
struct string_list_item *string_list_insert(struct string_list *list, const char *string)
|
|
{
|
|
return string_list_insert_at_index(list, -1, string);
|
|
}
|
|
|
|
struct string_list_item *string_list_insert_at_index(struct string_list *list,
|
|
int insert_at, const char *string)
|
|
{
|
|
int index = add_entry(insert_at, list, string);
|
|
|
|
if (index < 0)
|
|
index = -1 - index;
|
|
|
|
return list->items + index;
|
|
}
|
|
|
|
int string_list_has_string(const struct string_list *list, const char *string)
|
|
{
|
|
int exact_match;
|
|
get_entry_index(list, string, &exact_match);
|
|
return exact_match;
|
|
}
|
|
|
|
int string_list_find_insert_index(const struct string_list *list, const char *string,
|
|
int negative_existing_index)
|
|
{
|
|
int exact_match;
|
|
int index = get_entry_index(list, string, &exact_match);
|
|
if (exact_match)
|
|
index = -1 - (negative_existing_index ? index : 0);
|
|
return index;
|
|
}
|
|
|
|
struct string_list_item *string_list_lookup(struct string_list *list, const char *string)
|
|
{
|
|
int exact_match, i = get_entry_index(list, string, &exact_match);
|
|
if (!exact_match)
|
|
return NULL;
|
|
return list->items + i;
|
|
}
|
|
|
|
int for_each_string_list(struct string_list *list,
|
|
string_list_each_func_t fn, void *cb_data)
|
|
{
|
|
int i, ret = 0;
|
|
for (i = 0; i < list->nr; i++)
|
|
if ((ret = fn(&list->items[i], cb_data)))
|
|
break;
|
|
return ret;
|
|
}
|
|
|
|
void string_list_clear(struct string_list *list, int free_util)
|
|
{
|
|
if (list->items) {
|
|
int i;
|
|
if (list->strdup_strings) {
|
|
for (i = 0; i < list->nr; i++)
|
|
free(list->items[i].string);
|
|
}
|
|
if (free_util) {
|
|
for (i = 0; i < list->nr; i++)
|
|
free(list->items[i].util);
|
|
}
|
|
free(list->items);
|
|
}
|
|
list->items = NULL;
|
|
list->nr = list->alloc = 0;
|
|
}
|
|
|
|
void string_list_clear_func(struct string_list *list, string_list_clear_func_t clearfunc)
|
|
{
|
|
if (list->items) {
|
|
int i;
|
|
if (clearfunc) {
|
|
for (i = 0; i < list->nr; i++)
|
|
clearfunc(list->items[i].util, list->items[i].string);
|
|
}
|
|
if (list->strdup_strings) {
|
|
for (i = 0; i < list->nr; i++)
|
|
free(list->items[i].string);
|
|
}
|
|
free(list->items);
|
|
}
|
|
list->items = NULL;
|
|
list->nr = list->alloc = 0;
|
|
}
|
|
|
|
|
|
void print_string_list(const struct string_list *p, const char *text)
|
|
{
|
|
int i;
|
|
if ( text )
|
|
printf("%s\n", text);
|
|
for (i = 0; i < p->nr; i++)
|
|
printf("%s:%p\n", p->items[i].string, p->items[i].util);
|
|
}
|
|
|
|
struct string_list_item *string_list_append(struct string_list *list, const char *string)
|
|
{
|
|
ALLOC_GROW(list->items, list->nr + 1, list->alloc);
|
|
list->items[list->nr].string =
|
|
list->strdup_strings ? xstrdup(string) : (char *)string;
|
|
list->items[list->nr].util = NULL;
|
|
return list->items + list->nr++;
|
|
}
|
|
|
|
static int cmp_items(const void *a, const void *b)
|
|
{
|
|
const struct string_list_item *one = a;
|
|
const struct string_list_item *two = b;
|
|
return strcmp(one->string, two->string);
|
|
}
|
|
|
|
void sort_string_list(struct string_list *list)
|
|
{
|
|
qsort(list->items, list->nr, sizeof(*list->items), cmp_items);
|
|
}
|
|
|
|
struct string_list_item *unsorted_string_list_lookup(struct string_list *list,
|
|
const char *string)
|
|
{
|
|
int i;
|
|
for (i = 0; i < list->nr; i++)
|
|
if (!strcmp(string, list->items[i].string))
|
|
return list->items + i;
|
|
return NULL;
|
|
}
|
|
|
|
int unsorted_string_list_has_string(struct string_list *list,
|
|
const char *string)
|
|
{
|
|
return unsorted_string_list_lookup(list, string) != NULL;
|
|
}
|
|
|
|
void unsorted_string_list_delete_item(struct string_list *list, int i, int free_util)
|
|
{
|
|
if (list->strdup_strings)
|
|
free(list->items[i].string);
|
|
if (free_util)
|
|
free(list->items[i].util);
|
|
list->items[i] = list->items[list->nr-1];
|
|
list->nr--;
|
|
}
|