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-rw-r--r--rawmemelem.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/rawmemelem.c b/rawmemelem.c
new file mode 100644
index 0000000..ba21a32
--- /dev/null
+++ b/rawmemelem.c
@@ -0,0 +1,68 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+void *
+libsimple_rawmemelem(const void *hay_, const void *sub_, size_t subn)
+{
+ switch (subn) {
+ case 0:
+ return (void *)hay_;
+ case 1:
+ return rawmemchr(hay_, *(char *)sub_);
+ case 2:
+ {
+ uint16_t *hay = (void *)hay_;
+ uint16_t sub = *(uint16_t *)sub_;
+ for (; *hay != sub; hay++);
+ return hay;
+ }
+ case 4:
+ {
+ uint32_t *hay = (void *)hay_;
+ uint32_t sub = *(uint32_t *)sub_;
+ for (; *hay != sub; hay++);
+ return hay;
+ }
+ case 8:
+ {
+ uint64_t *hay = (void *)hay_;
+ uint64_t sub = *(uint64_t *)sub_;
+ for (; *hay != sub; hay++);
+ return hay;
+ }
+ default:
+ {
+ char *hay = (void *)hay_;
+ const char *sub = sub_;
+ size_t i;
+ for (;; hay += subn) {
+ for (i = 0; i < subn; i++)
+ if (hay[i] != sub[i])
+ goto next;
+ return hay;
+ next:;
+ }
+ }
+ }
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+ assert(!strcmpnul(libsimple_rawmemelem("12345634", "", 0), "12345634"));
+ assert(!strcmpnul(libsimple_rawmemelem("12345634", "3", 1), "345634"));
+ assert(!strcmpnul(libsimple_rawmemelem("13456342", "3", 1), "3456342"));
+ assert(!strcmpnul(libsimple_rawmemelem("12345634", "34", 2), "345634"));
+ assert(!strcmpnul(libsimple_rawmemelem("abcd1234abcd1234", "1234", 4), "1234abcd1234"));
+ assert(!strcmpnul(libsimple_rawmemelem("abcdefgh12345678abcdefgh12345678", "12345678", 8), "12345678abcdefgh12345678"));
+ assert(!strcmpnul(libsimple_rawmemelem("abc123abc123", "123", 3), "123abc123"));
+ return 0;
+}
+
+#endif