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Commit | Line | Data |
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82b27616 NB |
1 | |
2 | /* doubly linked lists */ | |
3 | /* This is free software. No strings attached. No copyright claimed */ | |
4 | ||
5 | #include <unistd.h> | |
6 | #include <stdlib.h> | |
7 | #include <string.h> | |
98c6faba NB |
8 | #ifdef __dietlibc__ |
9 | char *strncpy(char *dest, const char *src, size_t n) __THROW; | |
10 | #endif | |
503975b9 | 11 | void *xcalloc(size_t num, size_t size); |
82b27616 | 12 | #include "dlink.h" |
82b27616 NB |
13 | |
14 | void *dl_head() | |
15 | { | |
16 | void *h; | |
17 | h = dl_alloc(0); | |
18 | dl_next(h) = h; | |
19 | dl_prev(h) = h; | |
20 | return h; | |
21 | } | |
22 | ||
23 | void dl_free(void *v) | |
24 | { | |
25 | struct __dl_head *vv = v; | |
26 | free(vv-1); | |
27 | } | |
28 | ||
29 | void dl_init(void *v) | |
30 | { | |
31 | dl_next(v) = v; | |
32 | dl_prev(v) = v; | |
33 | } | |
34 | ||
35 | void dl_insert(void *head, void *val) | |
36 | { | |
37 | dl_next(val) = dl_next(head); | |
38 | dl_prev(val) = head; | |
39 | dl_next(dl_prev(val)) = val; | |
40 | dl_prev(dl_next(val)) = val; | |
41 | } | |
42 | ||
43 | void dl_add(void *head, void *val) | |
44 | { | |
45 | dl_prev(val) = dl_prev(head); | |
46 | dl_next(val) = head; | |
47 | dl_next(dl_prev(val)) = val; | |
48 | dl_prev(dl_next(val)) = val; | |
49 | } | |
50 | ||
51 | void dl_del(void *val) | |
52 | { | |
53 | if (dl_prev(val) == 0 || dl_next(val) == 0) | |
54 | return; | |
55 | dl_prev(dl_next(val)) = dl_prev(val); | |
56 | dl_next(dl_prev(val)) = dl_next(val); | |
57 | dl_prev(val) = dl_next(val) = 0; | |
58 | } | |
59 | ||
60 | char *dl_strndup(char *s, int l) | |
61 | { | |
62 | char *n; | |
63 | if (s == NULL) | |
64 | return NULL; | |
65 | n = dl_newv(char, l+1); | |
503975b9 N |
66 | strncpy(n, s, l); |
67 | n[l] = 0; | |
68 | return n; | |
82b27616 NB |
69 | } |
70 | ||
71 | char *dl_strdup(char *s) | |
72 | { | |
73 | return dl_strndup(s, (int)strlen(s)); | |
74 | } |