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file 197 lines (171 sloc) 4.82 kb
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#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--;
}
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