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- improved strrstr impl from vda with testcases from Tito and vda

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Bernhard Reutner-Fischer 2008-06-17 12:11:34 +00:00
parent 6eaf8deddd
commit 13436ea0dd
1 changed files with 69 additions and 6 deletions
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75
libbb/strrstr.c
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@ -7,14 +7,77 @@
* Licensed under GPLv2 or later, see file License in this tarball for details. * Licensed under GPLv2 or later, see file License in this tarball for details.
*/ */
#include "libbb.h" #include <string.h>
#include <stdio.h>
/* reverse strstr() */ /*
* The strrstr() function finds the last occurrence of the substring needle
* in the string haystack. The terminating nul characters are not compared.
*/
char* strrstr(const char *haystack, const char *needle) char* strrstr(const char *haystack, const char *needle)
{ {
char *tmp = strrchr(haystack, *needle); char *r = NULL;
if (tmp == NULL || strcmp(tmp, needle) != 0)
return NULL; if (!needle[0])
return tmp; return r;
while (1) {
char *p = strstr(haystack, needle);
if (!p)
return r;
r = p;
haystack = p + 1;
}
} }
#ifdef __DO_STRRSTR_TEST
/* Test */
int main(int argc, char **argv)
{
int ret = 0;
int n;
char *tmp;
ret |= !(n = ((tmp = strrstr("baaabaaab", "aaa")) != NULL && strcmp(tmp, "aaab") == 0));
printf("'baaabaaab' vs. 'aaa' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = ((tmp = strrstr("baaabaaaab", "aaa")) != NULL && strcmp(tmp, "aaab") == 0));
printf("'baaabaaaab' vs. 'aaa' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = ((tmp = strrstr("baaabaab", "aaa")) != NULL && strcmp(tmp, "aaabaab") == 0));
printf("'baaabaab' vs. 'aaa' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = (strrstr("aaa", "aaa") != NULL));
printf("'aaa' vs. 'aaa' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = (strrstr("aaa", "a") != NULL));
printf("'aaa' vs. 'a' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = (strrstr("aaa", "bbb") == NULL));
printf("'aaa' vs. 'bbb' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = (strrstr("a", "aaa") == NULL));
printf("'a' vs. 'aaa' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = ((tmp = strrstr("aaa", "")) != NULL && strcmp(tmp, "aaa") == 0));
printf("'aaa' vs. '' : %s\n", n ? "FAILED" : "PASSED");
ret |= !(n = (strrstr("", "aaa") == NULL));
printf("'' vs. 'aaa' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = ((tmp = strrstr("", "")) != NULL && strcmp(tmp, "") == 0));
printf("'' vs. '' : %s\n", n ? "PASSED" : "FAILED");
/*ret |= !(n = (strrstr(NULL, NULL) == NULL));
printf("'NULL' vs. 'NULL' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = (strrstr("", NULL) == NULL));
printf("'' vs. 'NULL' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = (strrstr(NULL, "") == NULL));
printf("'NULL' vs. '' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = (strrstr("aaa", NULL) == NULL));
printf("'aaa' vs. 'NULL' : %s\n", n ? "PASSED" : "FAILED");
ret |= !(n = (strrstr(NULL, "aaa") == NULL));
printf("'NULL' vs. 'aaa' : %s\n", n ? "PASSED" : "FAILED");*/
return ret;
}
#endif