1 /* (c) 2007,2008 Andrei Nigmatulin */
2
3 #ifndef FPM_ARRAYS_H
4 #define FPM_ARRAYS_H 1
5
6 #include <stdlib.h>
7 #include <string.h>
8
9 struct fpm_array_s {
10 void *data;
11 size_t sz;
12 size_t used;
13 size_t allocated;
14 };
15
fpm_array_init(struct fpm_array_s * a,unsigned int sz,unsigned int initial_num)16 static inline struct fpm_array_s *fpm_array_init(struct fpm_array_s *a, unsigned int sz, unsigned int initial_num) /* {{{ */
17 {
18 void *allocated = 0;
19
20 if (!a) {
21 a = malloc(sizeof(struct fpm_array_s));
22
23 if (!a) {
24 return 0;
25 }
26
27 allocated = a;
28 }
29
30 a->sz = sz;
31
32 a->data = calloc(sz, initial_num);
33
34 if (!a->data) {
35 free(allocated);
36 return 0;
37 }
38
39 a->allocated = initial_num;
40 a->used = 0;
41
42 return a;
43 }
44 /* }}} */
45
fpm_array_item(struct fpm_array_s * a,unsigned int n)46 static inline void *fpm_array_item(struct fpm_array_s *a, unsigned int n) /* {{{ */
47 {
48 char *ret;
49
50 ret = (char *) a->data + a->sz * n;
51
52 return ret;
53 }
54 /* }}} */
55
fpm_array_item_last(struct fpm_array_s * a)56 static inline void *fpm_array_item_last(struct fpm_array_s *a) /* {{{ */
57 {
58 return fpm_array_item(a, a->used - 1);
59 }
60 /* }}} */
61
fpm_array_item_remove(struct fpm_array_s * a,unsigned int n)62 static inline int fpm_array_item_remove(struct fpm_array_s *a, unsigned int n) /* {{{ */
63 {
64 int ret = -1;
65
66 if (n < a->used - 1) {
67 void *last = fpm_array_item(a, a->used - 1);
68 void *to_remove = fpm_array_item(a, n);
69
70 memcpy(to_remove, last, a->sz);
71
72 ret = n;
73 }
74
75 --a->used;
76
77 return ret;
78 }
79 /* }}} */
80
fpm_array_push(struct fpm_array_s * a)81 static inline void *fpm_array_push(struct fpm_array_s *a) /* {{{ */
82 {
83 void *ret;
84
85 if (a->used == a->allocated) {
86 size_t new_allocated = a->allocated ? a->allocated * 2 : 20;
87 void *new_ptr = realloc(a->data, a->sz * new_allocated);
88
89 if (!new_ptr) {
90 return 0;
91 }
92
93 a->data = new_ptr;
94 a->allocated = new_allocated;
95 }
96
97 ret = fpm_array_item(a, a->used);
98
99 ++a->used;
100
101 return ret;
102 }
103 /* }}} */
104
fpm_array_free(struct fpm_array_s * a)105 static inline void fpm_array_free(struct fpm_array_s *a) /* {{{ */
106 {
107 free(a->data);
108 a->data = 0;
109 a->sz = 0;
110 a->used = a->allocated = 0;
111 }
112 /* }}} */
113
114 #endif
115
