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