Last change
on this file since 3861 was 3621, checked in by Bruno Cornec, 8 years ago |
New 3?3 banch for incorporation of latest busybox 1.25. Changing minor version to handle potential incompatibilities.
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File size:
1.3 KB
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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) 2008 Bernhard Reutner-Fischer
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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 | #include "libbb.h"
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11 |
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12 | /*
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13 | * The strrstr() function finds the last occurrence of the substring needle
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14 | * in the string haystack. The terminating nul characters are not compared.
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15 | */
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16 | char* FAST_FUNC strrstr(const char *haystack, const char *needle)
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17 | {
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18 | char *r = NULL;
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19 |
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20 | if (!needle[0])
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21 | return (char*)haystack + strlen(haystack);
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22 | while (1) {
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23 | char *p = strstr(haystack, needle);
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24 | if (!p)
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25 | return r;
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26 | r = p;
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27 | haystack = p + 1;
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28 | }
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29 | }
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30 |
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31 | #if ENABLE_UNIT_TEST
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32 |
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33 | BBUNIT_DEFINE_TEST(strrstr)
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34 | {
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35 | static const struct {
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36 | const char *h, *n;
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37 | int pos;
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38 | } test_array[] = {
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39 | /* 0123456789 */
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40 | { "baaabaaab", "aaa", 5 },
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41 | { "baaabaaaab", "aaa", 6 },
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42 | { "baaabaab", "aaa", 1 },
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43 | { "aaa", "aaa", 0 },
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44 | { "aaa", "a", 2 },
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45 | { "aaa", "bbb", -1 },
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46 | { "a", "aaa", -1 },
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47 | { "aaa", "", 3 },
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48 | { "", "aaa", -1 },
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49 | { "", "", 0 },
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50 | };
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51 |
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52 | int i;
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53 |
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54 | i = 0;
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55 | while (i < sizeof(test_array) / sizeof(test_array[0])) {
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56 | const char *r = strrstr(test_array[i].h, test_array[i].n);
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57 | if (r == NULL)
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58 | r = test_array[i].h - 1;
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59 | BBUNIT_ASSERT_EQ(r, test_array[i].h + test_array[i].pos);
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60 | i++;
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61 | }
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62 |
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63 | BBUNIT_ENDTEST;
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64 | }
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65 |
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66 | #endif /* ENABLE_UNIT_TEST */
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