string-list.c

   1 #include "cache.h"
   2 #include "string-list.h"
   3
   4 void string_list_init(struct string_list *list, int strdup_strings)
   5 {
   6         memset(list, 0, sizeof(*list));
   7         list->strdup_strings = strdup_strings;
   8 }
   9
  10 /* if there is no exact match, point to the index where the entry could be
  11  * inserted */
  12 static int get_entry_index(const struct string_list *list, const char *string,
  13                 int *exact_match)
  14 {
  15         int left = -1, right = list->nr;
  16         compare_strings_fn cmp = list->cmp ? list->cmp : strcmp;
  17
  18         while (left + 1 < right) {
  19                 int middle = (left + right) / 2;
  20                 int compare = cmp(string, list->items[middle].string);
  21                 if (compare < 0)
  22                         right = middle;
  23                 else if (compare > 0)
  24                         left = middle;
  25                 else {
  26                         *exact_match = 1;
  27                         return middle;
  28                 }
  29         }
  30
  31         *exact_match = 0;
  32         return right;
  33 }
  34
  35 /* returns -1-index if already exists */
  36 static int add_entry(int insert_at, struct string_list *list, const char *string)
  37 {
  38         int exact_match = 0;
  39         int index = insert_at != -1 ? insert_at : get_entry_index(list, string, &exact_match);
  40
  41         if (exact_match)
  42                 return -1 - index;
  43
  44         if (list->nr + 1 >= list->alloc) {
  45                 list->alloc += 32;
  46                 REALLOC_ARRAY(list->items, list->alloc);
  47         }
  48         if (index < list->nr)
  49                 memmove(list->items + index + 1, list->items + index,
  50                                 (list->nr - index)
  51                                 * sizeof(struct string_list_item));
  52         list->items[index].string = list->strdup_strings ?
  53                 xstrdup(string) : (char *)string;
  54         list->items[index].util = NULL;
  55         list->nr++;
  56
  57         return index;
  58 }
  59
  60 struct string_list_item *string_list_insert(struct string_list *list, const char *string)
  61 {
  62         int index = add_entry(-1, list, string);
  63
  64         if (index < 0)
  65                 index = -1 - index;
  66
  67         return list->items + index;
  68 }
  69
  70 int 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
  77 int 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
  87 struct string_list_item *string_list_lookup(struct string_list *list, const char *string)
  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
  95 void string_list_remove_duplicates(struct string_list *list, int free_util)
  96 {
  97         if (list->nr > 1) {
  98                 int src, dst;
  99                 compare_strings_fn cmp = list->cmp ? list->cmp : strcmp;
 100                 for (src = dst = 1; src < list->nr; src++) {
 101                         if (!cmp(list->items[dst - 1].string, list->items[src].string)) {
 102                                 if (list->strdup_strings)
 103                                         free(list->items[src].string);
 104                                 if (free_util)
 105                                         free(list->items[src].util);
 106                         } else
 107                                 list->items[dst++] = list->items[src];
 108                 }
 109                 list->nr = dst;
 110         }
 111 }
 112
 113 int for_each_string_list(struct string_list *list,
 114                          string_list_each_func_t fn, void *cb_data)
 115 {
 116         int i, ret = 0;
 117         for (i = 0; i < list->nr; i++)
 118                 if ((ret = fn(&list->items[i], cb_data)))
 119                         break;
 120         return ret;
 121 }
 122
 123 void filter_string_list(struct string_list *list, int free_util,
 124                         string_list_each_func_t want, void *cb_data)
 125 {
 126         int src, dst = 0;
 127         for (src = 0; src < list->nr; src++) {
 128                 if (want(&list->items[src], cb_data)) {
 129                         list->items[dst++] = list->items[src];
 130                 } else {
 131                         if (list->strdup_strings)
 132                                 free(list->items[src].string);
 133                         if (free_util)
 134                                 free(list->items[src].util);
 135                 }
 136         }
 137         list->nr = dst;
 138 }
 139
 140 static int item_is_not_empty(struct string_list_item *item, void *unused)
 141 {
 142         return *item->string != '\0';
 143 }
 144
 145 void string_list_remove_empty_items(struct string_list *list, int free_util) {
 146         filter_string_list(list, free_util, item_is_not_empty, NULL);
 147 }
 148
 149 void string_list_clear(struct string_list *list, int free_util)
 150 {
 151         if (list->items) {
 152                 int i;
 153                 if (list->strdup_strings) {
 154                         for (i = 0; i < list->nr; i++)
 155                                 free(list->items[i].string);
 156                 }
 157                 if (free_util) {
 158                         for (i = 0; i < list->nr; i++)
 159                                 free(list->items[i].util);
 160                 }
 161                 free(list->items);
 162         }
 163         list->items = NULL;
 164         list->nr = list->alloc = 0;
 165 }
 166
 167 void string_list_clear_func(struct string_list *list, string_list_clear_func_t clearfunc)
 168 {
 169         if (list->items) {
 170                 int i;
 171                 if (clearfunc) {
 172                         for (i = 0; i < list->nr; i++)
 173                                 clearfunc(list->items[i].util, list->items[i].string);
 174                 }
 175                 if (list->strdup_strings) {
 176                         for (i = 0; i < list->nr; i++)
 177                                 free(list->items[i].string);
 178                 }
 179                 free(list->items);
 180         }
 181         list->items = NULL;
 182         list->nr = list->alloc = 0;
 183 }
 184
 185
 186 void print_string_list(const struct string_list *p, const char *text)
 187 {
 188         int i;
 189         if ( text )
 190                 printf("%s\n", text);
 191         for (i = 0; i < p->nr; i++)
 192                 printf("%s:%p\n", p->items[i].string, p->items[i].util);
 193 }
 194
 195 struct string_list_item *string_list_append_nodup(struct string_list *list,
 196                                                   char *string)
 197 {
 198         struct string_list_item *retval;
 199         ALLOC_GROW(list->items, list->nr + 1, list->alloc);
 200         retval = &list->items[list->nr++];
 201         retval->string = string;
 202         retval->util = NULL;
 203         return retval;
 204 }
 205
 206 struct string_list_item *string_list_append(struct string_list *list,
 207                                             const char *string)
 208 {
 209         return string_list_append_nodup(
 210                         list,
 211                         list->strdup_strings ? xstrdup(string) : (char *)string);
 212 }
 213
 214 /* Yuck */
 215 static compare_strings_fn compare_for_qsort;
 216
 217 /* Only call this from inside string_list_sort! */
 218 static int cmp_items(const void *a, const void *b)
 219 {
 220         const struct string_list_item *one = a;
 221         const struct string_list_item *two = b;
 222         return compare_for_qsort(one->string, two->string);
 223 }
 224
 225 void string_list_sort(struct string_list *list)
 226 {
 227         compare_for_qsort = list->cmp ? list->cmp : strcmp;
 228         qsort(list->items, list->nr, sizeof(*list->items), cmp_items);
 229 }
 230
 231 struct string_list_item *unsorted_string_list_lookup(struct string_list *list,
 232                                                      const char *string)
 233 {
 234         struct string_list_item *item;
 235         compare_strings_fn cmp = list->cmp ? list->cmp : strcmp;
 236
 237         for_each_string_list_item(item, list)
 238                 if (!cmp(string, item->string))
 239                         return item;
 240         return NULL;
 241 }
 242
 243 int unsorted_string_list_has_string(struct string_list *list,
 244                                     const char *string)
 245 {
 246         return unsorted_string_list_lookup(list, string) != NULL;
 247 }
 248
 249 void unsorted_string_list_delete_item(struct string_list *list, int i, int free_util)
 250 {
 251         if (list->strdup_strings)
 252                 free(list->items[i].string);
 253         if (free_util)
 254                 free(list->items[i].util);
 255         list->items[i] = list->items[list->nr-1];
 256         list->nr--;
 257 }
 258
 259 int string_list_split(struct string_list *list, const char *string,
 260                       int delim, int maxsplit)
 261 {
 262         int count = 0;
 263         const char *p = string, *end;
 264
 265         if (!list->strdup_strings)
 266                 die("internal error in string_list_split(): "
 267                     "list->strdup_strings must be set");
 268         for (;;) {
 269                 count++;
 270                 if (maxsplit >= 0 && count > maxsplit) {
 271                         string_list_append(list, p);
 272                         return count;
 273                 }
 274                 end = strchr(p, delim);
 275                 if (end) {
 276                         string_list_append_nodup(list, xmemdupz(p, end - p));
 277                         p = end + 1;
 278                 } else {
 279                         string_list_append(list, p);
 280                         return count;
 281                 }
 282         }
 283 }
 284
 285 int string_list_split_in_place(struct string_list *list, char *string,
 286                                int delim, int maxsplit)
 287 {
 288         int count = 0;
 289         char *p = string, *end;
 290
 291         if (list->strdup_strings)
 292                 die("internal error in string_list_split_in_place(): "
 293                     "list->strdup_strings must not be set");
 294         for (;;) {
 295                 count++;
 296                 if (maxsplit >= 0 && count > maxsplit) {
 297                         string_list_append(list, p);
 298                         return count;
 299                 }
 300                 end = strchr(p, delim);
 301                 if (end) {
 302                         *end = '\0';
 303                         string_list_append(list, p);
 304                         p = end + 1;
 305                 } else {
 306                         string_list_append(list, p);
 307                         return count;
 308                 }
 309         }
 310 }