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1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2010 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation; either version 2 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
22 | #include <string.h> | |
23 | ||
24 | #include "macro.h" | |
25 | #include "util.h" | |
26 | #include "specifier.h" | |
27 | ||
28 | /* | |
29 | * Generic infrastructure for replacing %x style specifiers in | |
30 | * strings. Will call a callback for each replacement. | |
31 | * | |
32 | */ | |
33 | ||
34 | char *specifier_printf(const char *text, const Specifier table[], void *userdata) { | |
35 | char *r, *t; | |
36 | const char *f; | |
37 | bool percent = false; | |
38 | size_t l; | |
39 | ||
40 | assert(text); | |
41 | assert(table); | |
42 | ||
43 | l = strlen(text); | |
44 | if (!(r = new(char, l+1))) | |
45 | return NULL; | |
46 | ||
47 | t = r; | |
48 | ||
49 | for (f = text; *f; f++, l--) { | |
50 | ||
51 | if (percent) { | |
52 | if (*f == '%') | |
53 | *(t++) = '%'; | |
54 | else { | |
55 | const Specifier *i; | |
56 | ||
57 | for (i = table; i->specifier; i++) | |
58 | if (i->specifier == *f) | |
59 | break; | |
60 | ||
61 | if (i->lookup) { | |
62 | char *n, *w; | |
63 | size_t k, j; | |
64 | ||
65 | if (!(w = i->lookup(i->specifier, i->data, userdata))) { | |
66 | free(r); | |
67 | return NULL; | |
68 | } | |
69 | ||
70 | j = t - r; | |
71 | k = strlen(w); | |
72 | ||
73 | if (!(n = new(char, j + k + (l - (f - text)) + 1))) { | |
74 | free(r); | |
75 | free(w); | |
76 | return NULL; | |
77 | } | |
78 | ||
79 | memcpy(n, r, j); | |
80 | memcpy(n + j, w, k); | |
81 | ||
82 | free(r); | |
83 | free(w); | |
84 | ||
85 | r = n; | |
86 | t = n + j + k; | |
87 | } else { | |
88 | *(t++) = '%'; | |
89 | *(t++) = *f; | |
90 | } | |
91 | } | |
92 | ||
93 | percent = false; | |
94 | } else if (*f == '%') | |
95 | percent = true; | |
96 | else | |
97 | *(t++) = *f; | |
98 | } | |
99 | ||
100 | *t = 0; | |
101 | return r; | |
102 | } | |
103 | ||
104 | /* Generic handler for simple string replacements */ | |
105 | ||
106 | char* specifier_string(char specifier, void *data, void *userdata) { | |
107 | assert(data); | |
108 | ||
109 | return strdup(strempty(data)); | |
110 | } |