/*
* Utility routines.
*
- * Copyright (C) 2008 Bernhard Fischer
+ * Copyright (C) 2008 Bernhard Reutner-Fischer
*
* Licensed under GPLv2 or later, see file License in this tarball for details.
*/
+#ifdef __DO_STRRSTR_TEST
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#else
#include "libbb.h"
+#endif
-/* reverse strstr() */
-char* strrstr(const char *haystack, const char *needle)
+/*
+ * The strrstr() function finds the last occurrence of the substring needle
+ * in the string haystack. The terminating nul characters are not compared.
+ */
+char* FAST_FUNC strrstr(const char *haystack, const char *needle)
{
- char *tmp = strrchr(haystack, *needle);
- if (tmp == NULL || strcmp(tmp, needle) != 0)
- return NULL;
- return tmp;
+ char *r = NULL;
+
+ if (!needle[0])
+ return (char*)haystack + strlen(haystack);
+ while (1) {
+ char *p = strstr(haystack, needle);
+ if (!p)
+ return r;
+ r = p;
+ haystack = p + 1;
+ }
}
+#ifdef __DO_STRRSTR_TEST
+int main(int argc, char **argv)
+{
+ static const struct {
+ const char *h, *n;
+ int pos;
+ } test_array[] = {
+ /* 0123456789 */
+ { "baaabaaab", "aaa", 5 },
+ { "baaabaaaab", "aaa", 6 },
+ { "baaabaab", "aaa", 1 },
+ { "aaa", "aaa", 0 },
+ { "aaa", "a", 2 },
+ { "aaa", "bbb", -1 },
+ { "a", "aaa", -1 },
+ { "aaa", "", 3 },
+ { "", "aaa", -1 },
+ { "", "", 0 },
+ };
+
+ int i;
+
+ i = 0;
+ while (i < sizeof(test_array) / sizeof(test_array[0])) {
+ const char *r = strrstr(test_array[i].h, test_array[i].n);
+ printf("'%s' vs. '%s': '%s' - ", test_array[i].h, test_array[i].n, r);
+ if (r == NULL)
+ r = test_array[i].h - 1;
+ printf("%s\n", r == test_array[i].h + test_array[i].pos ? "PASSED" : "FAILED");
+ i++;
+ }
+
+ return 0;
+}
+#endif