Implement strcasestr

test/val/strstr-test.c

@@ -0,0 +1,41 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+int fails = 0;
+
+#define STRSTR_TEST(needle,expected)                     \
+  if (strstr(haystack, (needle)) != (expected)) {        \
+    printf("strstr failure: expected %p for \"%s\", "    \
+           "got %p\n",                                   \
+           expected, needle, strstr(haystack, (needle)));\
+    fails++;                                             \
+  }
+
+#define STRCASESTR_TEST(needle,expected)                     \
+  if (strcasestr(haystack, (needle)) != (expected)) {        \
+    printf("strcasestr failure: expected %p for \"%s\", "    \
+           "got %p\n",                                       \
+           expected, needle, strcasestr(haystack, (needle)));\
+    fails++;                                                 \
+  }
+
+int main (void)
+{
+    const char *haystack = "This is a string to search in";
+
+    STRSTR_TEST("This is", haystack + 0);
+    STRSTR_TEST("a string", haystack + 8);
+    STRSTR_TEST("This is a string to search in", haystack);
+    STRSTR_TEST("search in", haystack + 20);
+    STRSTR_TEST("This is a string to search in with extra chars", NULL);
+    STRSTR_TEST("nowhere", NULL);
+
+    STRCASESTR_TEST("this is", haystack + 0);
+    STRCASESTR_TEST("a STRING", haystack + 8);
+    STRCASESTR_TEST("this is a string TO search in", haystack);
+    STRCASESTR_TEST("This is a string to search in with extra chars", NULL);
+    STRCASESTR_TEST("search IN", haystack + 20);
+
+    return fails;
+}