aboutsummaryrefslogtreecommitdiffstats
path: root/e2fsck/profile_helpers.c
blob: 9c9080a15503c1d8d43a7e76efe9e5a1116c30bf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
/*
 * profile_helpers.c -- Helper functions for the profile library
 *
 * These functions are not part of the "core" profile library, and do
 * not require access to the internal functions and data structures of
 * the profile library.  They are mainly convenience functions for
 * programs that want to do something unusual such as obtaining the
 * list of sections or relations, or accessing multiple values from a
 * relation that is listed more than once.  This functionality can all
 * be done using the profile_iterator abstraction, but it is less
 * convenient.
 *
 * Copyright (C) 2006 by Theodore Ts'o.
 *
 * %Begin-Header%
 * This file may be redistributed under the terms of the GNU Public
 * License.
 * %End-Header%
 */

#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include <et/com_err.h>
#include "profile.h"
#include "prof_err.h"

/*
 * These functions --- init_list(), end_list(), and add_to_list() are
 * internal functions used to build up a null-terminated char ** list
 * of strings to be returned by functions like profile_get_values.
 *
 * The profile_string_list structure is used for internal booking
 * purposes to build up the list, which is returned in *ret_list by
 * the end_list() function.
 *
 * The publicly exported interface for freeing char** list is
 * profile_free_list().
 */

struct profile_string_list {
	char	**list;
	int	num;
	int	max;
};

/*
 * Initialize the string list abstraction.
 */
static errcode_t init_list(struct profile_string_list *list)
{
	list->num = 0;
	list->max = 10;
	list->list = malloc(list->max * sizeof(char *));
	if (list->list == 0)
		return ENOMEM;
	list->list[0] = 0;
	return 0;
}

/*
 * Free any memory left over in the string abstraction, returning the
 * built up list in *ret_list if it is non-null.
 */
static void end_list(struct profile_string_list *list, char ***ret_list)
{
	char	**cp;

	if (list == 0)
		return;

	if (ret_list) {
		*ret_list = list->list;
		return;
	} else {
		for (cp = list->list; *cp; cp++)
			free(*cp);
		free(list->list);
	}
	list->num = list->max = 0;
	list->list = 0;
}

/*
 * Add a string to the list.
 */
static errcode_t add_to_list(struct profile_string_list *list, char *str)
{
	char 	**newlist;
	int	newmax;

	if (list->num+1 >= list->max) {
		newmax = list->max + 10;
		newlist = realloc(list->list, newmax * sizeof(char *));
		if (newlist == 0)
			return ENOMEM;
		list->max = newmax;
		list->list = newlist;
	}

	list->list[list->num++] = str;
	list->list[list->num] = 0;
	return 0;
}

/*
 * Return TRUE if the string is already a member of the list.
 */
static int is_list_member(struct profile_string_list *list, const char *str)
{
	char **cpp;

	if (!list->list)
		return 0;

	for (cpp = list->list; *cpp; cpp++) {
		if (!strcmp(*cpp, str))
			return 1;
	}
	return 0;
}

/*
 * This function frees a null-terminated list as returned by
 * profile_get_values.
 */
void profile_free_list(char **list)
{
    char	**cp;

    if (list == 0)
	    return;

    for (cp = list; *cp; cp++)
	free(*cp);
    free(list);
}

errcode_t
profile_get_values(profile_t profile, const char *const *names,
		   char ***ret_values)
{
	errcode_t		retval;
	void			*state;
	char			*value;
	struct profile_string_list values;

	if ((retval = profile_iterator_create(profile, names,
					      PROFILE_ITER_RELATIONS_ONLY,
					      &state)))
		return retval;

	if ((retval = init_list(&values)))
		return retval;

	do {
		if ((retval = profile_iterator(&state, 0, &value)))
			goto cleanup;
		if (value)
			add_to_list(&values, value);
	} while (state);

	if (values.num == 0) {
		retval = PROF_NO_RELATION;
		goto cleanup;
	}

	end_list(&values, ret_values);
	return 0;

cleanup:
	end_list(&values, 0);
	return retval;
}

/*
 * This function will return the list of the names of subections in the
 * under the specified section name.
 */
errcode_t
profile_get_subsection_names(profile_t profile, const char **names,
			     char ***ret_names)
{
	errcode_t		retval;
	void			*state;
	char			*name;
	struct profile_string_list values;

	if ((retval = profile_iterator_create(profile, names,
		   PROFILE_ITER_LIST_SECTION | PROFILE_ITER_SECTIONS_ONLY,
		   &state)))
		return retval;

	if ((retval = init_list(&values)))
		return retval;

	do {
		if ((retval = profile_iterator(&state, &name, 0)))
			goto cleanup;
		if (name)
			add_to_list(&values, name);
	} while (state);

	end_list(&values, ret_names);
	return 0;

cleanup:
	end_list(&values, 0);
	return retval;
}

/*
 * This function will return the list of the names of relations in the
 * under the specified section name.
 */
errcode_t
profile_get_relation_names(profile_t profile, const char **names,
			   char ***ret_names)
{
	errcode_t		retval;
	void			*state;
	char			*name;
	struct profile_string_list values;

	if ((retval = profile_iterator_create(profile, names,
		   PROFILE_ITER_LIST_SECTION | PROFILE_ITER_RELATIONS_ONLY,
		   &state)))
		return retval;

	if ((retval = init_list(&values)))
		return retval;

	do {
		if ((retval = profile_iterator(&state, &name, 0)))
			goto cleanup;
		if (name) {
			if (is_list_member(&values, name))
				free(name);
			else
				add_to_list(&values, name);
		}
	} while (state);

	end_list(&values, ret_names);
	return 0;

cleanup:
	end_list(&values, 0);
	return retval;
}


void
profile_release_string(char *str)
{
	free(str);
}

errcode_t
profile_init_path(const char * filepath,
		  profile_t *ret_profile)
{
	int n_entries, i;
	unsigned int ent_len;
	const char *s, *t;
	char **filenames;
	errcode_t retval;

	/* count the distinct filename components */
	for(s = filepath, n_entries = 1; *s; s++) {
		if (*s == ':')
			n_entries++;
	}

	/* the array is NULL terminated */
	filenames = (char **) malloc((n_entries+1) * sizeof(char*));
	if (filenames == 0)
		return ENOMEM;

	/* measure, copy, and skip each one */
	for(s = filepath, i=0; (t = strchr(s, ':')) || (t=s+strlen(s)); s=t+1, i++) {
		ent_len = t-s;
		filenames[i] = (char*) malloc(ent_len + 1);
		if (filenames[i] == 0) {
			/* if malloc fails, free the ones that worked */
			while(--i >= 0) free(filenames[i]);
                        free(filenames);
			return ENOMEM;
		}
		strncpy(filenames[i], s, ent_len);
		filenames[i][ent_len] = 0;
		if (*t == 0) {
			i++;
			break;
		}
	}
	/* cap the array */
	filenames[i] = 0;

	retval = profile_init((const char **) filenames,
			      ret_profile);

	/* count back down and free the entries */
	while(--i >= 0) free(filenames[i]);
	free(filenames);

	return retval;
}