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-rw-r--r--string-list.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/string-list.c b/string-list.c
new file mode 100644
index 0000000..ddd83c8
--- /dev/null
+++ b/string-list.c
@@ -0,0 +1,134 @@
+#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(struct string_list *list, const char *string)
+{
+ int exact_match;
+ int index = 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(const char *string, struct string_list *list)
+{
+ int index = add_entry(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;
+}
+
+struct string_list_item *string_list_lookup(const char *string, struct string_list *list)
+{
+ int exact_match, i = get_entry_index(list, string, &exact_match);
+ if (!exact_match)
+ return NULL;
+ return list->items + i;
+}
+
+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 print_string_list(const char *text, const struct string_list *p)
+{
+ 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(const char *string, struct string_list *list)
+{
+ ALLOC_GROW(list->items, list->nr + 1, list->alloc);
+ list->items[list->nr].string =
+ list->strdup_strings ? xstrdup(string) : (char *)string;
+ 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);
+}
+
+int unsorted_string_list_has_string(struct string_list *list, const char *string)
+{
+ int i;
+ for (i = 0; i < list->nr; i++)
+ if (!strcmp(string, list->items[i].string))
+ return 1;
+ return 0;
+}
+