1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Based on intlist.c by:
4 * (c) 2009 Arnaldo Carvalho de Melo <acme@redhat.com>
5 */
6
7 #include <errno.h>
8 #include <stdlib.h>
9 #include <linux/compiler.h>
10
11 #include "intlist.h"
12
13 static struct rb_node *intlist__node_new(struct rblist *rblist __maybe_unused,
14 const void *entry)
15 {
16 unsigned long i = (unsigned long)entry;
17 struct rb_node *rc = NULL;
18 struct int_node *node = malloc(sizeof(*node));
19
20 if (node != NULL) {
21 node->i = i;
22 node->priv = NULL;
23 rc = &node->rb_node;
24 }
25
26 return rc;
27 }
28
29 static void int_node__delete(struct int_node *ilist)
30 {
31 free(ilist);
32 }
33
34 static void intlist__node_delete(struct rblist *rblist __maybe_unused,
35 struct rb_node *rb_node)
36 {
37 struct int_node *node = container_of(rb_node, struct int_node, rb_node);
38
39 int_node__delete(node);
40 }
41
42 static int intlist__node_cmp(struct rb_node *rb_node, const void *entry)
43 {
44 unsigned long i = (unsigned long)entry;
45 struct int_node *node = container_of(rb_node, struct int_node, rb_node);
46
47 if (node->i > i)
48 return 1;
49 else if (node->i < i)
50 return -1;
51
52 return 0;
53 }
54
55 int intlist__add(struct intlist *ilist, unsigned long i)
56 {
57 return rblist__add_node(&ilist->rblist, (void *)i);
58 }
59
60 void intlist__remove(struct intlist *ilist, struct int_node *node)
61 {
62 rblist__remove_node(&ilist->rblist, &node->rb_node);
63 }
64
65 static struct int_node *__intlist__findnew(struct intlist *ilist,
66 unsigned long i, bool create)
67 {
68 struct int_node *node = NULL;
69 struct rb_node *rb_node;
70
71 if (ilist == NULL)
72 return NULL;
73
74 if (create)
75 rb_node = rblist__findnew(&ilist->rblist, (void *)i);
76 else
77 rb_node = rblist__find(&ilist->rblist, (void *)i);
78
79 if (rb_node)
80 node = container_of(rb_node, struct int_node, rb_node);
81
82 return node;
83 }
84
85 struct int_node *intlist__find(struct intlist *ilist, unsigned long i)
86 {
87 return __intlist__findnew(ilist, i, false);
88 }
89
90 struct int_node *intlist__findnew(struct intlist *ilist, unsigned long i)
91 {
92 return __intlist__findnew(ilist, i, true);
93 }
94
95 static int intlist__parse_list(struct intlist *ilist, const char *s)
96 {
97 char *sep;
98 int err;
99
100 do {
101 unsigned long value = strtol(s, &sep, 10);
102 err = -EINVAL;
103 if (*sep != ',' && *sep != '\0')
104 break;
105 err = intlist__add(ilist, value);
106 if (err)
107 break;
108 s = sep + 1;
109 } while (*sep != '\0');
110
111 return err;
112 }
113
114 struct intlist *intlist__new(const char *slist)
115 {
116 struct intlist *ilist = malloc(sizeof(*ilist));
117
118 if (ilist != NULL) {
119 rblist__init(&ilist->rblist);
120 ilist->rblist.node_cmp = intlist__node_cmp;
121 ilist->rblist.node_new = intlist__node_new;
122 ilist->rblist.node_delete = intlist__node_delete;
123
124 if (slist && intlist__parse_list(ilist, slist))
125 goto out_delete;
126 }
127
128 return ilist;
129 out_delete:
130 intlist__delete(ilist);
131 return NULL;
132 }
133
134 void intlist__delete(struct intlist *ilist)
135 {
136 if (ilist != NULL)
137 rblist__delete(&ilist->rblist);
138 }
139
140 struct int_node *intlist__entry(const struct intlist *ilist, unsigned int idx)
141 {
142 struct int_node *node = NULL;
143 struct rb_node *rb_node;
144
145 rb_node = rblist__entry(&ilist->rblist, idx);
146 if (rb_node)
147 node = container_of(rb_node, struct int_node, rb_node);
148
149 return node;
150 }
151
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