Rename path_list to string_list

[git.git] / string-list.c

diff --git a/string-list.c b/string-list.c
new file mode 100644 (file)
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;
+}
+