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-rw-r--r--memelemscan.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/memelemscan.c b/memelemscan.c
new file mode 100644
index 0000000..744989b
--- /dev/null
+++ b/memelemscan.c
@@ -0,0 +1,94 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+void *
+libsimple_memelemscan(const void *hay_, size_t hayn, const void *sub_, size_t subn)
+{
+ if (!subn)
+ return (void *)hay_;
+
+ switch (subn) {
+ case 1:
+ return libsimple_memscan(hay_, *(char *)sub_, hayn);
+ case 2:
+ {
+ uint16_t *hay = (void *)hay_;
+ uint16_t sub = *(uint16_t *)sub_;
+ for (; hayn-- && *hay != sub; hay++);
+ return hay;
+ }
+ case 4:
+ {
+ uint32_t *hay = (void *)hay_;
+ uint32_t sub = *(uint32_t *)sub_;
+ for (; hayn-- && *hay != sub; hay++);
+ return hay;
+ }
+ case 8:
+ {
+ uint64_t *hay = (void *)hay_;
+ uint64_t sub = *(uint64_t *)sub_;
+ for (; hayn-- && *hay != sub; hay++);
+ return hay;
+ }
+ default:
+ {
+ char *hay = (void *)hay_;
+ const char *sub = sub_;
+ size_t i;
+ for (; hayn--; hay += subn) {
+ for (i = 0; i < subn; i++)
+ if (hay[i] != sub[i])
+ goto next;
+ return hay;
+ next:;
+ }
+ return hay;
+ }
+ }
+
+ return NULL;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+ assert(!strcmpnul(libsimple_memelemscan("12345634", 8, "", 0), "12345634"));
+ assert(!strcmpnul(libsimple_memelemscan("12345634", 0, "", 0), "12345634"));
+
+ assert(!strcmpnul(libsimple_memelemscan("12345634", 8, "3", 1), "345634"));
+ assert(!strcmpnul(libsimple_memelemscan("12345634", 8, "x", 1), ""));
+ assert(!strcmpnul(libsimple_memelemscan("13456342", 8, "3", 1), "3456342"));
+ assert(!strcmpnul(libsimple_memelemscan("12345634", 0, "3", 1), "12345634"));
+
+ assert(!strcmpnul(libsimple_memelemscan("12345634", 4, "34", 2), "345634"));
+ assert(!strcmpnul(libsimple_memelemscan("12345634z", 4, "xx", 2), "z"));
+ assert(!strcmpnul(libsimple_memelemscan("13456342z", 4, "34", 2), "z"));
+ assert(!strcmpnul(libsimple_memelemscan("12345634z", 0, "34", 2), "12345634z"));
+
+ assert(!strcmpnul(libsimple_memelemscan("abcd1234abcd1234", 4, "1234", 4), "1234abcd1234"));
+ assert(!strcmpnul(libsimple_memelemscan("abcd1234abcd1234z", 4, "zzzz", 4), "z"));
+ assert(!strcmpnul(libsimple_memelemscan("cd1234abcd1234abz", 4, "1234", 4), "z"));
+ assert(!strcmpnul(libsimple_memelemscan("abcd1234abcd1234z", 0, "1234", 4), "abcd1234abcd1234z"));
+
+ assert(!strcmpnul(libsimple_memelemscan("abcdefgh12345678abcdefgh12345678", 4, "12345678", 8), "12345678abcdefgh12345678"));
+ assert(!strcmpnul(libsimple_memelemscan("abcdefgh12345678abcdefgh12345678z", 4, "zzzzzzzz", 8), "z"));
+ assert(!strcmpnul(libsimple_memelemscan("efgh12345678abcdefgh12345678abcdz", 4, "12345678", 8), "z"));
+ assert(!strcmpnul(libsimple_memelemscan("abcdefgh12345678abcdefgh12345678z", 0, "12345678", 8),
+ "abcdefgh12345678abcdefgh12345678z"));
+
+ assert(!strcmpnul(libsimple_memelemscan("abc123abc123", 4, "123", 3), "123abc123"));
+ assert(!strcmpnul(libsimple_memelemscan("abc123abc123z", 4, "zzz", 3), "z"));
+ assert(!strcmpnul(libsimple_memelemscan("bc123abc123az", 4, "123", 3), "z"));
+ assert(!strcmpnul(libsimple_memelemscan("abc123abc123z", 0, "123", 3), "abc123abc123z"));
+
+ return 0;
+}
+
+#endif