1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * (c) 2009 Arnaldo Carvalho de Melo <acme@redhat.com>
4 */
5
6#include "strlist.h"
7#include <errno.h>
8#include <stdio.h>
9#include <stdlib.h>
10#include <string.h>
11#include <unistd.h>
12#include <linux/zalloc.h>
13
14static
15struct rb_node *strlist__node_new(struct rblist *rblist, const void *entry)
16{
17	const char *s = entry;
18	struct rb_node *rc = NULL;
19	struct strlist *strlist = container_of(rblist, struct strlist, rblist);
20	struct str_node *snode = malloc(sizeof(*snode));
21
22	if (snode != NULL) {
23		if (strlist->dupstr) {
24			s = strdup(s);
25			if (s == NULL)
26				goto out_delete;
27		}
28		snode->s = s;
29		rc = &snode->rb_node;
30	}
31
32	return rc;
33
34out_delete:
35	free(snode);
36	return NULL;
37}
38
39static void str_node__delete(struct str_node *snode, bool dupstr)
40{
41	if (dupstr)
42		zfree((char **)&snode->s);
43	free(snode);
44}
45
46static
47void strlist__node_delete(struct rblist *rblist, struct rb_node *rb_node)
48{
49	struct strlist *slist = container_of(rblist, struct strlist, rblist);
50	struct str_node *snode = container_of(rb_node, struct str_node, rb_node);
51
52	str_node__delete(snode, slist->dupstr);
53}
54
55static int strlist__node_cmp(struct rb_node *rb_node, const void *entry)
56{
57	const char *str = entry;
58	struct str_node *snode = container_of(rb_node, struct str_node, rb_node);
59
60	return strcmp(snode->s, str);
61}
62
63int strlist__add(struct strlist *slist, const char *new_entry)
64{
65	return rblist__add_node(&slist->rblist, new_entry);
66}
67
68int strlist__load(struct strlist *slist, const char *filename)
69{
70	char entry[1024];
71	int err;
72	FILE *fp = fopen(filename, "r");
73
74	if (fp == NULL)
75		return -errno;
76
77	while (fgets(entry, sizeof(entry), fp) != NULL) {
78		const size_t len = strlen(entry);
79
80		if (len == 0)
81			continue;
82		entry[len - 1] = '\0';
83
84		err = strlist__add(slist, entry);
85		if (err != 0)
86			goto out;
87	}
88
89	err = 0;
90out:
91	fclose(fp);
92	return err;
93}
94
95void strlist__remove(struct strlist *slist, struct str_node *snode)
96{
97	rblist__remove_node(&slist->rblist, &snode->rb_node);
98}
99
100struct str_node *strlist__find(struct strlist *slist, const char *entry)
101{
102	struct str_node *snode = NULL;
103	struct rb_node *rb_node = rblist__find(&slist->rblist, entry);
104
105	if (rb_node)
106		snode = container_of(rb_node, struct str_node, rb_node);
107
108	return snode;
109}
110
111static int strlist__parse_list_entry(struct strlist *slist, const char *s,
112				     const char *subst_dir)
113{
114	int err;
115	char *subst = NULL;
116
117	if (strncmp(s, "file://", 7) == 0)
118		return strlist__load(slist, s + 7);
119
120	if (subst_dir) {
121		err = -ENOMEM;
122		if (asprintf(&subst, "%s/%s", subst_dir, s) < 0)
123			goto out;
124
125		if (access(subst, F_OK) == 0) {
126			err = strlist__load(slist, subst);
127			goto out;
128		}
129
130		if (slist->file_only) {
131			err = -ENOENT;
132			goto out;
133		}
134	}
135
136	err = strlist__add(slist, s);
137out:
138	free(subst);
139	return err;
140}
141
142static int strlist__parse_list(struct strlist *slist, const char *s, const char *subst_dir)
143{
144	char *sep;
145	int err;
146
147	while ((sep = strchr(s, ',')) != NULL) {
148		*sep = '\0';
149		err = strlist__parse_list_entry(slist, s, subst_dir);
150		*sep = ',';
151		if (err != 0)
152			return err;
153		s = sep + 1;
154	}
155
156	return *s ? strlist__parse_list_entry(slist, s, subst_dir) : 0;
157}
158
159struct strlist *strlist__new(const char *list, const struct strlist_config *config)
160{
161	struct strlist *slist = malloc(sizeof(*slist));
162
163	if (slist != NULL) {
164		bool dupstr = true;
165		bool file_only = false;
166		const char *dirname = NULL;
167
168		if (config) {
169			dupstr = !config->dont_dupstr;
170			dirname = config->dirname;
171			file_only = config->file_only;
172		}
173
174		rblist__init(&slist->rblist);
175		slist->rblist.node_cmp    = strlist__node_cmp;
176		slist->rblist.node_new    = strlist__node_new;
177		slist->rblist.node_delete = strlist__node_delete;
178
179		slist->dupstr	 = dupstr;
180		slist->file_only = file_only;
181
182		if (list && strlist__parse_list(slist, list, dirname) != 0)
183			goto out_error;
184	}
185
186	return slist;
187out_error:
188	free(slist);
189	return NULL;
190}
191
192void strlist__delete(struct strlist *slist)
193{
194	if (slist != NULL)
195		rblist__delete(&slist->rblist);
196}
197
198struct str_node *strlist__entry(const struct strlist *slist, unsigned int idx)
199{
200	struct str_node *snode = NULL;
201	struct rb_node *rb_node;
202
203	rb_node = rblist__entry(&slist->rblist, idx);
204	if (rb_node)
205		snode = container_of(rb_node, struct str_node, rb_node);
206
207	return snode;
208}
209