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Commit | Line | Data |
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53e1b683 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ */ |
6e6fb527 | 2 | /*** |
6e6fb527 | 3 | Copyright 2012 Lennart Poettering |
6e6fb527 LP |
4 | ***/ |
5 | ||
11c3a366 TA |
6 | #include <errno.h> |
7 | #include <stddef.h> | |
8 | #include <stdlib.h> | |
6e6fb527 LP |
9 | #include <string.h> |
10 | ||
b5efdb8a | 11 | #include "alloc-util.h" |
6e6fb527 | 12 | #include "macro.h" |
6e6fb527 | 13 | #include "replace-var.h" |
b11d6a7b | 14 | #include "string-util.h" |
6e6fb527 LP |
15 | |
16 | /* | |
17 | * Generic infrastructure for replacing @FOO@ style variables in | |
18 | * strings. Will call a callback for each replacement. | |
19 | */ | |
20 | ||
21 | static int get_variable(const char *b, char **r) { | |
22 | size_t k; | |
23 | char *t; | |
24 | ||
25 | assert(b); | |
26 | assert(r); | |
27 | ||
28 | if (*b != '@') | |
29 | return 0; | |
30 | ||
4b549144 | 31 | k = strspn(b + 1, UPPERCASE_LETTERS "_"); |
6e6fb527 LP |
32 | if (k <= 0 || b[k+1] != '@') |
33 | return 0; | |
34 | ||
35 | t = strndup(b + 1, k); | |
36 | if (!t) | |
37 | return -ENOMEM; | |
38 | ||
39 | *r = t; | |
40 | return 1; | |
41 | } | |
42 | ||
2d5dece8 | 43 | char *replace_var(const char *text, char *(*lookup)(const char *variable, void *userdata), void *userdata) { |
6e6fb527 LP |
44 | char *r, *t; |
45 | const char *f; | |
46 | size_t l; | |
47 | ||
48 | assert(text); | |
49 | assert(lookup); | |
50 | ||
51 | l = strlen(text); | |
52 | r = new(char, l+1); | |
53 | if (!r) | |
54 | return NULL; | |
55 | ||
56 | f = text; | |
57 | t = r; | |
58 | while (*f) { | |
59 | _cleanup_free_ char *v = NULL, *n = NULL; | |
60 | char *a; | |
61 | int k; | |
62 | size_t skip, d, nl; | |
63 | ||
64 | k = get_variable(f, &v); | |
65 | if (k < 0) | |
66 | goto oom; | |
67 | if (k == 0) { | |
68 | *(t++) = *(f++); | |
69 | continue; | |
70 | } | |
71 | ||
72 | n = lookup(v, userdata); | |
73 | if (!n) | |
74 | goto oom; | |
75 | ||
76 | skip = strlen(v) + 2; | |
77 | ||
78 | d = t - r; | |
79 | nl = l - skip + strlen(n); | |
80 | a = realloc(r, nl + 1); | |
81 | if (!a) | |
82 | goto oom; | |
83 | ||
84 | l = nl; | |
85 | r = a; | |
86 | t = r + d; | |
87 | ||
88 | t = stpcpy(t, n); | |
89 | f += skip; | |
90 | } | |
91 | ||
92 | *t = 0; | |
93 | return r; | |
94 | ||
95 | oom: | |
6b430fdb | 96 | return mfree(r); |
6e6fb527 | 97 | } |