blob: 8711f957daae242ea362b3726ea32c6367825083
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Utility routines. |
4 | * |
5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
8 | */ |
9 | |
10 | //kbuild:lib-y += replace.o |
11 | |
12 | #include "libbb.h" |
13 | |
14 | unsigned FAST_FUNC count_strstr(const char *str, const char *sub) |
15 | { |
16 | size_t sub_len = strlen(sub); |
17 | unsigned count = 0; |
18 | |
19 | while ((str = strstr(str, sub)) != NULL) { |
20 | count++; |
21 | str += sub_len; |
22 | } |
23 | return count; |
24 | } |
25 | |
26 | char* FAST_FUNC xmalloc_substitute_string(const char *src, int count, const char *sub, const char *repl) |
27 | { |
28 | char *buf, *dst, *end; |
29 | size_t sub_len = strlen(sub); |
30 | size_t repl_len = strlen(repl); |
31 | |
32 | //dbg_msg("subst(s:'%s',count:%d,sub:'%s',repl:'%s'", src, count, sub, repl); |
33 | |
34 | buf = dst = xmalloc(strlen(src) + count * ((int)repl_len - (int)sub_len) + 1); |
35 | /* we replace each sub with repl */ |
36 | while ((end = strstr(src, sub)) != NULL) { |
37 | dst = mempcpy(dst, src, end - src); |
38 | dst = mempcpy(dst, repl, repl_len); |
39 | /*src = end + 1; - GNU findutils 4.5.10 doesn't do this... */ |
40 | src = end + sub_len; /* but this. Try "xargs -Iaa echo aaa" */ |
41 | } |
42 | strcpy(dst, src); |
43 | //dbg_msg("subst9:'%s'", buf); |
44 | return buf; |
45 | } |
46 |