projects/linux·blob master · refs

203 lines · 4.0 KiB

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