string-list.c

   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 */
   6 static 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 */
  29 static int add_entry(struct string_list *list, const char *string)
  30 {
  31         int exact_match;
  32         int index = get_entry_index(list, string, &exact_match);
  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
  54 struct string_list_item *string_list_insert(const char *string, struct string_list *list)
  55 {
  56         int index = add_entry(list, string);
  57
  58         if (index < 0)
  59                 index = -1 - index;
  60
  61         return list->items + index;
  62 }
  63
  64 int string_list_has_string(const struct string_list *list, const char *string)
  65 {
  66         int exact_match;
  67         get_entry_index(list, string, &exact_match);
  68         return exact_match;
  69 }
  70
  71 struct string_list_item *string_list_lookup(const char *string, struct string_list *list)
  72 {
  73         int exact_match, i = get_entry_index(list, string, &exact_match);
  74         if (!exact_match)
  75                 return NULL;
  76         return list->items + i;
  77 }
  78
  79 void string_list_clear(struct string_list *list, int free_util)
  80 {
  81         if (list->items) {
  82                 int i;
  83                 if (list->strdup_strings) {
  84                         for (i = 0; i < list->nr; i++)
  85                                 free(list->items[i].string);
  86                 }
  87                 if (free_util) {
  88                         for (i = 0; i < list->nr; i++)
  89                                 free(list->items[i].util);
  90                 }
  91                 free(list->items);
  92         }
  93         list->items = NULL;
  94         list->nr = list->alloc = 0;
  95 }
  96
  97 void print_string_list(const char *text, const struct string_list *p)
  98 {
  99         int i;
 100         if ( text )
 101                 printf("%s\n", text);
 102         for (i = 0; i < p->nr; i++)
 103                 printf("%s:%p\n", p->items[i].string, p->items[i].util);
 104 }
 105
 106 struct string_list_item *string_list_append(const char *string, struct string_list *list)
 107 {
 108         ALLOC_GROW(list->items, list->nr + 1, list->alloc);
 109         list->items[list->nr].string =
 110                 list->strdup_strings ? xstrdup(string) : (char *)string;
 111         return list->items + list->nr++;
 112 }
 113
 114 static int cmp_items(const void *a, const void *b)
 115 {
 116         const struct string_list_item *one = a;
 117         const struct string_list_item *two = b;
 118         return strcmp(one->string, two->string);
 119 }
 120
 121 void sort_string_list(struct string_list *list)
 122 {
 123         qsort(list->items, list->nr, sizeof(*list->items), cmp_items);
 124 }
 125
 126 int unsorted_string_list_has_string(struct string_list *list, const char *string)
 127 {
 128         int i;
 129         for (i = 0; i < list->nr; i++)
 130                 if (!strcmp(string, list->items[i].string))
 131                         return 1;
 132         return 0;
 133 }
 134