1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
#include "l2su.h"
#include <stdlib.h>
#include <string.h>
struct l2_subst__item {
char *name;
char *value;
struct l2_subst__item *next;
};
struct l2_subst {
struct l2_subst__item *items;
int status;
};
int l2_subst_init(l2_subst_t **sp)
{
l2_subst_t *ret = calloc(1, sizeof(struct l2_subst));
if (!ret) return -1;
*sp = ret;
ret->items = NULL;
ret->status = 0;
return 0;
}
int l2_subst_add(l2_subst_t *sp, const char *name, const char *value)
{
if (sp->status < 0) return sp->status;
char *namedup = strdup(name);
char *valdup = strdup(value);
struct l2_subst__item *item = calloc(1, sizeof(struct l2_subst__item));
if (!namedup || !valdup || !item) {
free(namedup);
free(valdup);
free(item);
sp->status = -1;
return -1;
}
item->name = namedup;
item->value = valdup;
item->next = sp->items;
sp->items = item;
return 0;
}
const char *l2_subst__find(l2_subst_t *sp, const char *name, size_t len)
{
for (struct l2_subst__item *item = sp->items; item; item = item->next) {
if (!strncmp(item->name, name, len)) return item->value;
}
return NULL;
}
int l2_subst__append(char **retbuf, size_t *sz, size_t *cap, const char *start, const char *end)
{
ptrdiff_t len = end - start;
if (len <= 0) return 0;
if (*sz + len > *cap) {
size_t newcap = *cap ? *cap : 16;
while (newcap && *sz + len > newcap) newcap <<= 1;
if (!newcap) {
goto cleanup;
}
char *newbuf = realloc(*retbuf, newcap);
if (!newbuf) {
goto cleanup;
}
*retbuf = newbuf;
*cap = newcap;
}
memcpy(*retbuf + *sz, start, len);
*sz += len;
return 0;
cleanup:
free(*retbuf);
return -1;
}
int l2_subst_apply(l2_subst_t *sp, const char *in, char **out)
{
if (sp->status < 0) return sp->status;
char *retbuf = NULL, *temp;
size_t size = 0;
size_t cap = 0;
const char *lastcpy = in;
const char *open = NULL;
const char *cur;
for (cur = in; *cur; ++cur) {
if (*cur == '$' && *(cur + 1) == '{') {
if (l2_subst__append(&retbuf, &size, &cap, lastcpy, cur) < 0)
return -1;
lastcpy = cur;
open = cur + 2;
continue;
} else if (*cur == '}' && open) {
const char *rep = l2_subst__find(sp, open, cur - open);
if (rep) {
if (l2_subst__append(&retbuf, &size, &cap, rep, rep + strlen(rep)) < 0)
return -1;
lastcpy = cur + 1;
}
open = NULL;
}
}
if (l2_subst__append(&retbuf, &size, &cap, lastcpy, cur + 1) < 0) return -1;
temp = realloc(retbuf, size);
if (temp) retbuf = temp;
*out = retbuf;
return 0;
}
void l2_subst_free(l2_subst_t *sp)
{
if (!sp) return;
for (struct l2_subst__item *cur = sp->items, *temp; cur; cur = temp) {
temp = cur->next;
free(cur->name);
free(cur->value);
free(cur);
}
free(sp);
return;
}
|
