1 /*
2 * cook - file construction tool
3 * Copyright (C) 1998, 2006, 2007 Peter Miller;
4 * All rights reserved.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see
18 * <http://www.gnu.org/licenses/>.
19 */
20
21 #include <common/ac/string.h>
22
23 #include <common/str.h>
24 #include <common/stracc.h>
25
26
27 string_ty *
str_substitute(string_ty * a,string_ty * b,string_ty * c)28 str_substitute(string_ty *a, string_ty *b, string_ty *c)
29 {
30 char *cp;
31 char *ep;
32 static stracc sa;
33
34 sa_open(&sa);
35 cp = c->str_text;
36 ep = cp + c->str_length;
37 while (cp < ep)
38 {
39 if
40 (
41 (size_t)(ep - cp) < a->str_length
42 ||
43 0 != memcmp(a->str_text, cp, a->str_length)
44 )
45 {
46 sa_char(&sa, *cp++);
47 }
48 else
49 {
50 sa_chars(&sa, b->str_text, b->str_length);
51 cp += a->str_length;
52 }
53 }
54 return sa_close(&sa);
55 }
56