string-list: new for_each_string_list() function
[git/git.git] / string-list.c
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1#include "cache.h"
2#include "string-list.h"
3
4/* if there is no exact match, point to the index where the entry could be
5 * inserted */
6static int get_entry_index(const struct string_list *list, const char *string,
7 int *exact_match)
8{
9 int left = -1, right = list->nr;
10
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;
21 }
22 }
23
24 *exact_match = 0;
25 return right;
26}
27
28/* returns -1-index if already exists */
cfa1ee6b 29static int add_entry(int insert_at, struct string_list *list, const char *string)
c455c87c 30{
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31 int exact_match = 0;
32 int index = insert_at != -1 ? insert_at : get_entry_index(list, string, &exact_match);
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33
34 if (exact_match)
35 return -1 - index;
36
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));
41 }
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++;
50
51 return index;
52}
53
54struct string_list_item *string_list_insert(const char *string, struct string_list *list)
55{
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56 return string_list_insert_at_index(-1, string, list);
57}
58
59struct string_list_item *string_list_insert_at_index(int insert_at,
60 const char *string, struct string_list *list)
61{
62 int index = add_entry(insert_at, list, string);
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63
64 if (index < 0)
65 index = -1 - index;
66
67 return list->items + index;
68}
69
70int string_list_has_string(const struct string_list *list, const char *string)
71{
72 int exact_match;
73 get_entry_index(list, string, &exact_match);
74 return exact_match;
75}
76
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77int string_list_find_insert_index(const struct string_list *list, const char *string,
78 int negative_existing_index)
79{
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;
85}
86
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87struct string_list_item *string_list_lookup(const char *string, struct string_list *list)
88{
89 int exact_match, i = get_entry_index(list, string, &exact_match);
90 if (!exact_match)
91 return NULL;
92 return list->items + i;
93}
94
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95int for_each_string_list(string_list_each_func_t fn,
96 struct string_list *list, void *cb_data)
97{
98 int i, ret = 0;
99 for (i = 0; i < list->nr; i++)
100 if ((ret = fn(&list->items[i], cb_data)))
101 break;
102 return ret;
103}
104
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105void string_list_clear(struct string_list *list, int free_util)
106{
107 if (list->items) {
108 int i;
109 if (list->strdup_strings) {
110 for (i = 0; i < list->nr; i++)
111 free(list->items[i].string);
112 }
113 if (free_util) {
114 for (i = 0; i < list->nr; i++)
115 free(list->items[i].util);
116 }
117 free(list->items);
118 }
119 list->items = NULL;
120 list->nr = list->alloc = 0;
121}
122
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123void string_list_clear_func(struct string_list *list, string_list_clear_func_t clearfunc)
124{
125 if (list->items) {
126 int i;
127 if (clearfunc) {
128 for (i = 0; i < list->nr; i++)
129 clearfunc(list->items[i].util, list->items[i].string);
130 }
131 if (list->strdup_strings) {
132 for (i = 0; i < list->nr; i++)
133 free(list->items[i].string);
134 }
135 free(list->items);
136 }
137 list->items = NULL;
138 list->nr = list->alloc = 0;
139}
140
141
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142void print_string_list(const char *text, const struct string_list *p)
143{
144 int i;
145 if ( text )
146 printf("%s\n", text);
147 for (i = 0; i < p->nr; i++)
148 printf("%s:%p\n", p->items[i].string, p->items[i].util);
149}
150
151struct string_list_item *string_list_append(const char *string, struct string_list *list)
152{
153 ALLOC_GROW(list->items, list->nr + 1, list->alloc);
154 list->items[list->nr].string =
155 list->strdup_strings ? xstrdup(string) : (char *)string;
156 return list->items + list->nr++;
157}
158
159static int cmp_items(const void *a, const void *b)
160{
161 const struct string_list_item *one = a;
162 const struct string_list_item *two = b;
163 return strcmp(one->string, two->string);
164}
165
166void sort_string_list(struct string_list *list)
167{
168 qsort(list->items, list->nr, sizeof(*list->items), cmp_items);
169}
170
171int unsorted_string_list_has_string(struct string_list *list, const char *string)
172{
173 int i;
174 for (i = 0; i < list->nr; i++)
175 if (!strcmp(string, list->items[i].string))
176 return 1;
177 return 0;
178}
179