string-list.h

   1 #ifndef STRING_LIST_H
   2 #define STRING_LIST_H
   3
   4 struct string_list_item {
   5         char *string;
   6         void *util;
   7 };
   8
   9 typedef int (*compare_strings_fn)(const char *, const char *);
  10
  11 struct string_list {
  12         struct string_list_item *items;
  13         unsigned int nr, alloc;
  14         unsigned int strdup_strings:1;
  15         compare_strings_fn cmp; /* NULL uses strcmp() */
  16 };
  17
  18 #define STRING_LIST_INIT_NODUP { NULL, 0, 0, 0 }
  19 #define STRING_LIST_INIT_DUP   { NULL, 0, 0, 1 }
  20
  21 void print_string_list(const struct string_list *p, const char *text);
  22 void string_list_clear(struct string_list *list, int free_util);
  23
  24 /* Use this function to call a custom clear function on each util pointer */
  25 /* The string associated with the util pointer is passed as the second argument */
  26 typedef void (*string_list_clear_func_t)(void *p, const char *str);
  27 void string_list_clear_func(struct string_list *list, string_list_clear_func_t clearfunc);
  28
  29 /* Use this function or the macro below to iterate over each item */
  30 typedef int (*string_list_each_func_t)(struct string_list_item *, void *);
  31 int for_each_string_list(struct string_list *list,
  32                          string_list_each_func_t, void *cb_data);
  33 #define for_each_string_list_item(item,list) \
  34         for (item = (list)->items; item < (list)->items + (list)->nr; ++item)
  35
  36 /*
  37  * Apply want to each item in list, retaining only the ones for which
  38  * the function returns true.  If free_util is true, call free() on
  39  * the util members of any items that have to be deleted.  Preserve
  40  * the order of the items that are retained.
  41  */
  42 void filter_string_list(struct string_list *list, int free_util,
  43                         string_list_each_func_t want, void *cb_data);
  44
  45 /*
  46  * Remove any empty strings from the list.  If free_util is true, call
  47  * free() on the util members of any items that have to be deleted.
  48  * Preserve the order of the items that are retained.
  49  */
  50 void string_list_remove_empty_items(struct string_list *list, int free_util);
  51
  52 /*
  53  * Return the longest string in prefixes that is a prefix (in the
  54  * sense of prefixcmp()) of string, or NULL if no such prefix exists.
  55  * This function does not require the string_list to be sorted (it
  56  * does a linear search).
  57  */
  58 char *string_list_longest_prefix(const struct string_list *prefixes, const char *string);
  59
  60
  61 /* Use these functions only on sorted lists: */
  62 int string_list_has_string(const struct string_list *list, const char *string);
  63 int string_list_find_insert_index(const struct string_list *list, const char *string,
  64                                   int negative_existing_index);
  65 struct string_list_item *string_list_insert(struct string_list *list, const char *string);
  66 struct string_list_item *string_list_insert_at_index(struct string_list *list,
  67                                                      int insert_at, const char *string);
  68 struct string_list_item *string_list_lookup(struct string_list *list, const char *string);
  69
  70 /*
  71  * Remove all but the first of consecutive entries with the same
  72  * string value.  If free_util is true, call free() on the util
  73  * members of any items that have to be deleted.
  74  */
  75 void string_list_remove_duplicates(struct string_list *sorted_list, int free_util);
  76
  77
  78 /* Use these functions only on unsorted lists: */
  79
  80 /*
  81  * Add string to the end of list.  If list->strdup_string is set, then
  82  * string is copied; otherwise the new string_list_entry refers to the
  83  * input string.
  84  */
  85 struct string_list_item *string_list_append(struct string_list *list, const char *string);
  86
  87 /*
  88  * Like string_list_append(), except string is never copied.  When
  89  * list->strdup_strings is set, this function can be used to hand
  90  * ownership of a malloc()ed string to list without making an extra
  91  * copy.
  92  */
  93 struct string_list_item *string_list_append_nodup(struct string_list *list, char *string);
  94
  95 void sort_string_list(struct string_list *list);
  96 int unsorted_string_list_has_string(struct string_list *list, const char *string);
  97 struct string_list_item *unsorted_string_list_lookup(struct string_list *list,
  98                                                      const char *string);
  99
 100 void unsorted_string_list_delete_item(struct string_list *list, int i, int free_util);
 101
 102 /*
 103  * Split string into substrings on character delim and append the
 104  * substrings to list.  The input string is not modified.
 105  * list->strdup_strings must be set, as new memory needs to be
 106  * allocated to hold the substrings.  If maxsplit is non-negative,
 107  * then split at most maxsplit times.  Return the number of substrings
 108  * appended to list.
 109  *
 110  * Examples:
 111  *   string_list_split(l, "foo:bar:baz", ':', -1) -> ["foo", "bar", "baz"]
 112  *   string_list_split(l, "foo:bar:baz", ':', 0) -> ["foo:bar:baz"]
 113  *   string_list_split(l, "foo:bar:baz", ':', 1) -> ["foo", "bar:baz"]
 114  *   string_list_split(l, "foo:bar:", ':', -1) -> ["foo", "bar", ""]
 115  *   string_list_split(l, "", ':', -1) -> [""]
 116  *   string_list_split(l, ":", ':', -1) -> ["", ""]
 117  */
 118 int string_list_split(struct string_list *list, const char *string,
 119                       int delim, int maxsplit);
 120
 121 /*
 122  * Like string_list_split(), except that string is split in-place: the
 123  * delimiter characters in string are overwritten with NULs, and the
 124  * new string_list_items point into string (which therefore must not
 125  * be modified or freed while the string_list is in use).
 126  * list->strdup_strings must *not* be set.
 127  */
 128 int string_list_split_in_place(struct string_list *list, char *string,
 129                                int delim, int maxsplit);
 130 #endif /* STRING_LIST_H */