2 * profile_helpers.c -- Helper functions for the profile library
4 * These functions are not part of the "core" profile library, and do
5 * not require access to the internal functions and data structures of
6 * the profile library. They are mainly convenience functions for
7 * programs that want to do something unusual such as obtaining the
8 * list of sections or relations, or accessing multiple values from a
9 * relation that is listed more than once. This functionality can all
10 * be done using the profile_iterator abstraction, but it is less
13 * Copyright (C) 2006 by Theodore Ts'o.
16 * This file may be redistributed under the terms of the GNU Public
26 #include <et/com_err.h>
28 #include "profile_helpers.h"
32 * These functions --- init_list(), end_list(), and add_to_list() are
33 * internal functions used to build up a null-terminated char ** list
34 * of strings to be returned by functions like profile_get_values.
36 * The profile_string_list structure is used for internal booking
37 * purposes to build up the list, which is returned in *ret_list by
38 * the end_list() function.
40 * The publicly exported interface for freeing char** list is
41 * profile_free_list().
44 struct profile_string_list {
51 * Initialize the string list abstraction.
53 static errcode_t init_list(struct profile_string_list *list)
57 list->list = malloc(list->max * sizeof(char *));
65 * Free any memory left over in the string abstraction, returning the
66 * built up list in *ret_list if it is non-null.
68 static void end_list(struct profile_string_list *list, char ***ret_list)
76 *ret_list = list->list;
79 for (cp = list->list; *cp; cp++)
83 list->num = list->max = 0;
88 * Add a string to the list.
90 static errcode_t add_to_list(struct profile_string_list *list, char *str)
95 if (list->num+1 >= list->max) {
96 newmax = list->max + 10;
97 newlist = realloc(list->list, newmax * sizeof(char *));
101 list->list = newlist;
104 list->list[list->num++] = str;
105 list->list[list->num] = 0;
110 * Return TRUE if the string is already a member of the list.
112 static int is_list_member(struct profile_string_list *list, const char *str)
119 for (cpp = list->list; *cpp; cpp++) {
120 if (!strcmp(*cpp, str))
127 * This function frees a null-terminated list as returned by
128 * profile_get_values.
130 void profile_free_list(char **list)
137 for (cp = list; *cp; cp++)
143 profile_get_values(profile_t profile, const char *const *names,
149 struct profile_string_list values;
151 if ((retval = profile_iterator_create(profile, names,
152 PROFILE_ITER_RELATIONS_ONLY,
156 if ((retval = init_list(&values)))
157 goto cleanup_iterator;
160 if ((retval = profile_iterator(&state, 0, &value)))
163 add_to_list(&values, value);
166 if (values.num == 0) {
167 retval = PROF_NO_RELATION;
171 end_list(&values, ret_values);
175 end_list(&values, 0);
177 profile_iterator_free(&state);
182 * This function will return the list of the names of subsections in the
183 * under the specified section name.
186 profile_get_subsection_names(profile_t profile, const char **names,
192 struct profile_string_list values;
194 if ((retval = profile_iterator_create(profile, names,
195 PROFILE_ITER_LIST_SECTION | PROFILE_ITER_SECTIONS_ONLY,
199 if ((retval = init_list(&values)))
200 goto cleanup_iterator;
203 if ((retval = profile_iterator(&state, &name, 0)))
206 add_to_list(&values, name);
209 end_list(&values, ret_names);
213 end_list(&values, 0);
215 profile_iterator_free(&state);
220 * This function will return the list of the names of relations in the
221 * under the specified section name.
224 profile_get_relation_names(profile_t profile, const char **names,
230 struct profile_string_list values;
232 if ((retval = profile_iterator_create(profile, names,
233 PROFILE_ITER_LIST_SECTION | PROFILE_ITER_RELATIONS_ONLY,
237 if ((retval = init_list(&values)))
238 goto cleanup_iterator;
241 if ((retval = profile_iterator(&state, &name, 0)))
244 if (is_list_member(&values, name))
247 add_to_list(&values, name);
251 end_list(&values, ret_names);
255 end_list(&values, 0);
257 profile_iterator_free(&state);
263 profile_release_string(char *str)
269 profile_init_path(const char * filepath,
270 profile_t *ret_profile)
273 unsigned int ent_len;
278 /* count the distinct filename components */
279 for(s = filepath, n_entries = 1; *s; s++) {
284 /* the array is NULL terminated */
285 filenames = (char **) malloc((n_entries+1) * sizeof(char*));
289 /* measure, copy, and skip each one */
290 for(s = filepath, i=0; (t = strchr(s, ':')) || (t=s+strlen(s)); s=t+1, i++) {
292 filenames[i] = (char*) malloc(ent_len + 1);
293 if (filenames[i] == 0) {
294 /* if malloc fails, free the ones that worked */
295 while(--i >= 0) free(filenames[i]);
299 strncpy(filenames[i], s, ent_len);
300 filenames[i][ent_len] = 0;
309 retval = profile_init((const char * const *) filenames,
312 /* count back down and free the entries */
313 while(--i >= 0) free(filenames[i]);