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7#include "strlist.h"
8#include <errno.h>
9#include <stdio.h>
10#include <stdlib.h>
11#include <string.h>
12
13static struct str_node *str_node__new(const char *s, bool dupstr)
14{
15 struct str_node *self = malloc(sizeof(*self));
16
17 if (self != NULL) {
18 if (dupstr) {
19 s = strdup(s);
20 if (s == NULL)
21 goto out_delete;
22 }
23 self->s = s;
24 }
25
26 return self;
27
28out_delete:
29 free(self);
30 return NULL;
31}
32
33static void str_node__delete(struct str_node *self, bool dupstr)
34{
35 if (dupstr)
36 free((void *)self->s);
37 free(self);
38}
39
40int strlist__add(struct strlist *self, const char *new_entry)
41{
42 struct rb_node **p = &self->entries.rb_node;
43 struct rb_node *parent = NULL;
44 struct str_node *sn;
45
46 while (*p != NULL) {
47 int rc;
48
49 parent = *p;
50 sn = rb_entry(parent, struct str_node, rb_node);
51 rc = strcmp(sn->s, new_entry);
52
53 if (rc > 0)
54 p = &(*p)->rb_left;
55 else if (rc < 0)
56 p = &(*p)->rb_right;
57 else
58 return -EEXIST;
59 }
60
61 sn = str_node__new(new_entry, self->dupstr);
62 if (sn == NULL)
63 return -ENOMEM;
64
65 rb_link_node(&sn->rb_node, parent, p);
66 rb_insert_color(&sn->rb_node, &self->entries);
67 ++self->nr_entries;
68
69 return 0;
70}
71
72int strlist__load(struct strlist *self, const char *filename)
73{
74 char entry[1024];
75 int err;
76 FILE *fp = fopen(filename, "r");
77
78 if (fp == NULL)
79 return errno;
80
81 while (fgets(entry, sizeof(entry), fp) != NULL) {
82 const size_t len = strlen(entry);
83
84 if (len == 0)
85 continue;
86 entry[len - 1] = '\0';
87
88 err = strlist__add(self, entry);
89 if (err != 0)
90 goto out;
91 }
92
93 err = 0;
94out:
95 fclose(fp);
96 return err;
97}
98
99void strlist__remove(struct strlist *self, struct str_node *sn)
100{
101 rb_erase(&sn->rb_node, &self->entries);
102 str_node__delete(sn, self->dupstr);
103}
104
105bool strlist__has_entry(struct strlist *self, const char *entry)
106{
107 struct rb_node **p = &self->entries.rb_node;
108 struct rb_node *parent = NULL;
109
110 while (*p != NULL) {
111 struct str_node *sn;
112 int rc;
113
114 parent = *p;
115 sn = rb_entry(parent, struct str_node, rb_node);
116 rc = strcmp(sn->s, entry);
117
118 if (rc > 0)
119 p = &(*p)->rb_left;
120 else if (rc < 0)
121 p = &(*p)->rb_right;
122 else
123 return true;
124 }
125
126 return false;
127}
128
129static int strlist__parse_list_entry(struct strlist *self, const char *s)
130{
131 if (strncmp(s, "file://", 7) == 0)
132 return strlist__load(self, s + 7);
133
134 return strlist__add(self, s);
135}
136
137int strlist__parse_list(struct strlist *self, const char *s)
138{
139 char *sep;
140 int err;
141
142 while ((sep = strchr(s, ',')) != NULL) {
143 *sep = '\0';
144 err = strlist__parse_list_entry(self, s);
145 *sep = ',';
146 if (err != 0)
147 return err;
148 s = sep + 1;
149 }
150
151 return *s ? strlist__parse_list_entry(self, s) : 0;
152}
153
154struct strlist *strlist__new(bool dupstr, const char *slist)
155{
156 struct strlist *self = malloc(sizeof(*self));
157
158 if (self != NULL) {
159 self->entries = RB_ROOT;
160 self->dupstr = dupstr;
161 self->nr_entries = 0;
162 if (slist && strlist__parse_list(self, slist) != 0)
163 goto out_error;
164 }
165
166 return self;
167out_error:
168 free(self);
169 return NULL;
170}
171
172void strlist__delete(struct strlist *self)
173{
174 if (self != NULL) {
175 struct str_node *pos;
176 struct rb_node *next = rb_first(&self->entries);
177
178 while (next) {
179 pos = rb_entry(next, struct str_node, rb_node);
180 next = rb_next(&pos->rb_node);
181 strlist__remove(self, pos);
182 }
183 self->entries = RB_ROOT;
184 free(self);
185 }
186}
187
188struct str_node *strlist__entry(const struct strlist *self, unsigned int idx)
189{
190 struct rb_node *nd;
191
192 for (nd = rb_first(&self->entries); nd; nd = rb_next(nd)) {
193 struct str_node *pos = rb_entry(nd, struct str_node, rb_node);
194
195 if (!idx--)
196 return pos;
197 }
198
199 return NULL;
200}
201
