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-rw-r--r--memelem.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/memelem.c b/memelem.c
new file mode 100644
index 0000000..2561456
--- /dev/null
+++ b/memelem.c
@@ -0,0 +1,73 @@
+/* See LICENSE file for copyright and license details. */
+#include "libsimple.h"
+#ifndef TEST
+
+
+void *
+libsimple_memelem(const void *hay_, size_t hayn, const void *sub_, size_t subn)
+{
+ if (!subn)
+ return (void *)hay_;
+
+ switch (subn) {
+ case 1:
+ return memchr(hay_, hayn, *(char *)sub_);
+ case 2:
+ {
+ uint16_t *hay = (void *)hay_;
+ uint16_t sub = *(uint16_t *)sub_;
+ for (; hayn--; hay++)
+ if (*hay == sub)
+ return hay;
+ break;
+ }
+ case 4:
+ {
+ uint32_t *hay = (void *)hay_;
+ uint32_t sub = *(uint32_t *)sub_;
+ for (; hayn--; hay++)
+ if (*hay == sub)
+ return hay;
+ break;
+ }
+ case 8:
+ {
+ uint64_t *hay = (void *)hay_;
+ uint64_t sub = *(uint64_t *)sub_;
+ for (; hayn--; hay++)
+ if (*hay == sub)
+ return hay;
+ break;
+ }
+ default:
+ {
+ char *hay = (void *)hay_;
+ const char *sub = sub_;
+ for (; hayn--; hay += subn)
+ if (!memcmp(hay, sub, subn))
+ return hay;
+ break;
+
+ }
+ }
+
+ return NULL;
+}
+
+
+#else
+#include "test.h"
+
+int
+main(void)
+{
+ assert(!strcmpnul(libsimple_memelem("12345634", 4, "", 0), "12345634"));
+ assert(!strcmpnul(libsimple_memelem("12345634", 4, "34", 2), "345634"));
+ assert(!libsimple_memelem("12345634", 4, "xx", 2));
+ assert(!libsimple_memelem("13456342", 4, "34", 2));
+ assert(!libsimple_memelem("12345634", 0, "34", 2));
+ assert(!strcmpnul(libsimple_memelem("12345634", 0, "34", 0), "12345634"));
+ return 0;
+}
+
+#endif