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-rw-r--r--memrelem_inv.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/memrelem_inv.c b/memrelem_inv.c
new file mode 100644
index 0000000..5cadab1
--- /dev/null
+++ b/memrelem_inv.c
@@ -0,0 +1,76 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+void *
+libsimple_memrelem_inv(const void *hay_, size_t hayn, const void *sub_, size_t subn) /* TODO test, man */
+{
+ switch (subn) {
+ case 0:
+ return NULL;
+ case 1:
+ {
+ uint8_t *hay = (void *)hay_;
+ uint8_t sub = *(uint8_t *)sub_;
+ for (hay += hayn; hayn--;)
+ if (*--hay != sub)
+ return hay;
+ break;
+ }
+ case 2:
+ {
+ uint16_t *hay = (void *)hay_;
+ uint16_t sub = *(uint16_t *)sub_;
+ for (hay += hayn; hayn--;)
+ if (*--hay != sub)
+ return hay;
+ break;
+ }
+ case 4:
+ {
+ uint32_t *hay = (void *)hay_;
+ uint32_t sub = *(uint32_t *)sub_;
+ for (hay += hayn; hayn--;)
+ if (*--hay != sub)
+ return hay;
+ break;
+ }
+ case 8:
+ {
+ uint64_t *hay = (void *)hay_;
+ uint64_t sub = *(uint64_t *)sub_;
+ for (hay += hayn; hayn--;)
+ if (*--hay != sub)
+ return hay;
+ break;
+ }
+ default:
+ {
+ char *hay = (void *)hay_;
+ const char *sub = sub_;
+ size_t i;
+ for (hay += hayn * subn; hayn--;) {
+ hay -= subn;
+ for (i = 0; i < subn; i++)
+ if (hay[i] != sub[i])
+ return hay;
+ }
+ break;
+ }
+ }
+
+ return NULL;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+ return 0;
+}
+
+#endif