Move estimate_bisect_steps to libgit.a
[git/jnareb-git.git] / string-list.c
blobc54b816244f69614c67c532d20719081a4b34bd4
1 #include "cache.h"
2 #include "string-list.h"
4 /* if there is no exact match, point to the index where the entry could be
5 * inserted */
6 static int get_entry_index(const struct string_list *list, const char *string,
7 int *exact_match)
9 int left = -1, right = list->nr;
11 while (left + 1 < right) {
12 int middle = (left + right) / 2;
13 int compare = strcmp(string, list->items[middle].string);
14 if (compare < 0)
15 right = middle;
16 else if (compare > 0)
17 left = middle;
18 else {
19 *exact_match = 1;
20 return middle;
24 *exact_match = 0;
25 return right;
28 /* returns -1-index if already exists */
29 static int add_entry(int insert_at, struct string_list *list, const char *string)
31 int exact_match = 0;
32 int index = insert_at != -1 ? insert_at : get_entry_index(list, string, &exact_match);
34 if (exact_match)
35 return -1 - index;
37 if (list->nr + 1 >= list->alloc) {
38 list->alloc += 32;
39 list->items = xrealloc(list->items, list->alloc
40 * sizeof(struct string_list_item));
42 if (index < list->nr)
43 memmove(list->items + index + 1, list->items + index,
44 (list->nr - index)
45 * sizeof(struct string_list_item));
46 list->items[index].string = list->strdup_strings ?
47 xstrdup(string) : (char *)string;
48 list->items[index].util = NULL;
49 list->nr++;
51 return index;
54 struct string_list_item *string_list_insert(struct string_list *list, const char *string)
56 return string_list_insert_at_index(list, -1, string);
59 struct string_list_item *string_list_insert_at_index(struct string_list *list,
60 int insert_at, const char *string)
62 int index = add_entry(insert_at, list, string);
64 if (index < 0)
65 index = -1 - index;
67 return list->items + index;
70 int string_list_has_string(const struct string_list *list, const char *string)
72 int exact_match;
73 get_entry_index(list, string, &exact_match);
74 return exact_match;
77 int string_list_find_insert_index(const struct string_list *list, const char *string,
78 int negative_existing_index)
80 int exact_match;
81 int index = get_entry_index(list, string, &exact_match);
82 if (exact_match)
83 index = -1 - (negative_existing_index ? index : 0);
84 return index;
87 struct string_list_item *string_list_lookup(struct string_list *list, const char *string)
89 int exact_match, i = get_entry_index(list, string, &exact_match);
90 if (!exact_match)
91 return NULL;
92 return list->items + i;
95 void string_list_remove_duplicates(struct string_list *list, int free_util)
97 if (list->nr > 1) {
98 int src, dst;
99 for (src = dst = 1; src < list->nr; src++) {
100 if (!strcmp(list->items[dst - 1].string, list->items[src].string)) {
101 if (list->strdup_strings)
102 free(list->items[src].string);
103 if (free_util)
104 free(list->items[src].util);
105 } else
106 list->items[dst++] = list->items[src];
108 list->nr = dst;
112 int for_each_string_list(struct string_list *list,
113 string_list_each_func_t fn, void *cb_data)
115 int i, ret = 0;
116 for (i = 0; i < list->nr; i++)
117 if ((ret = fn(&list->items[i], cb_data)))
118 break;
119 return ret;
122 void filter_string_list(struct string_list *list, int free_util,
123 string_list_each_func_t want, void *cb_data)
125 int src, dst = 0;
126 for (src = 0; src < list->nr; src++) {
127 if (want(&list->items[src], cb_data)) {
128 list->items[dst++] = list->items[src];
129 } else {
130 if (list->strdup_strings)
131 free(list->items[src].string);
132 if (free_util)
133 free(list->items[src].util);
136 list->nr = dst;
139 char *string_list_longest_prefix(const struct string_list *prefixes,
140 const char *string)
142 int i, max_len = -1;
143 char *retval = NULL;
145 for (i = 0; i < prefixes->nr; i++) {
146 char *prefix = prefixes->items[i].string;
147 if (!prefixcmp(string, prefix)) {
148 int len = strlen(prefix);
149 if (len > max_len) {
150 retval = prefix;
151 max_len = len;
156 return retval;
159 void string_list_clear(struct string_list *list, int free_util)
161 if (list->items) {
162 int i;
163 if (list->strdup_strings) {
164 for (i = 0; i < list->nr; i++)
165 free(list->items[i].string);
167 if (free_util) {
168 for (i = 0; i < list->nr; i++)
169 free(list->items[i].util);
171 free(list->items);
173 list->items = NULL;
174 list->nr = list->alloc = 0;
177 void string_list_clear_func(struct string_list *list, string_list_clear_func_t clearfunc)
179 if (list->items) {
180 int i;
181 if (clearfunc) {
182 for (i = 0; i < list->nr; i++)
183 clearfunc(list->items[i].util, list->items[i].string);
185 if (list->strdup_strings) {
186 for (i = 0; i < list->nr; i++)
187 free(list->items[i].string);
189 free(list->items);
191 list->items = NULL;
192 list->nr = list->alloc = 0;
196 void print_string_list(const struct string_list *p, const char *text)
198 int i;
199 if ( text )
200 printf("%s\n", text);
201 for (i = 0; i < p->nr; i++)
202 printf("%s:%p\n", p->items[i].string, p->items[i].util);
205 struct string_list_item *string_list_append_nodup(struct string_list *list,
206 char *string)
208 struct string_list_item *retval;
209 ALLOC_GROW(list->items, list->nr + 1, list->alloc);
210 retval = &list->items[list->nr++];
211 retval->string = string;
212 retval->util = NULL;
213 return retval;
216 struct string_list_item *string_list_append(struct string_list *list,
217 const char *string)
219 return string_list_append_nodup(
220 list,
221 list->strdup_strings ? xstrdup(string) : (char *)string);
224 static int cmp_items(const void *a, const void *b)
226 const struct string_list_item *one = a;
227 const struct string_list_item *two = b;
228 return strcmp(one->string, two->string);
231 void sort_string_list(struct string_list *list)
233 qsort(list->items, list->nr, sizeof(*list->items), cmp_items);
236 struct string_list_item *unsorted_string_list_lookup(struct string_list *list,
237 const char *string)
239 int i;
240 for (i = 0; i < list->nr; i++)
241 if (!strcmp(string, list->items[i].string))
242 return list->items + i;
243 return NULL;
246 int unsorted_string_list_has_string(struct string_list *list,
247 const char *string)
249 return unsorted_string_list_lookup(list, string) != NULL;
252 void unsorted_string_list_delete_item(struct string_list *list, int i, int free_util)
254 if (list->strdup_strings)
255 free(list->items[i].string);
256 if (free_util)
257 free(list->items[i].util);
258 list->items[i] = list->items[list->nr-1];
259 list->nr--;
262 int string_list_split(struct string_list *list, const char *string,
263 int delim, int maxsplit)
265 int count = 0;
266 const char *p = string, *end;
268 if (!list->strdup_strings)
269 die("internal error in string_list_split(): "
270 "list->strdup_strings must be set");
271 for (;;) {
272 count++;
273 if (maxsplit >= 0 && count > maxsplit) {
274 string_list_append(list, p);
275 return count;
277 end = strchr(p, delim);
278 if (end) {
279 string_list_append_nodup(list, xmemdupz(p, end - p));
280 p = end + 1;
281 } else {
282 string_list_append(list, p);
283 return count;
288 int string_list_split_in_place(struct string_list *list, char *string,
289 int delim, int maxsplit)
291 int count = 0;
292 char *p = string, *end;
294 if (list->strdup_strings)
295 die("internal error in string_list_split_in_place(): "
296 "list->strdup_strings must not be set");
297 for (;;) {
298 count++;
299 if (maxsplit >= 0 && count > maxsplit) {
300 string_list_append(list, p);
301 return count;
303 end = strchr(p, delim);
304 if (end) {
305 *end = '\0';
306 string_list_append(list, p);
307 p = end + 1;
308 } else {
309 string_list_append(list, p);
310 return count;