initial check-in, version 0.5.0

src/string/stpcpy.c

@@ -0,0 +1,29 @@
+#include <string.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <limits.h>
+#include "libc.h"
+
+#define ALIGN (sizeof(size_t)-1)
+#define ONES ((size_t)-1/UCHAR_MAX)
+#define HIGHS (ONES * (UCHAR_MAX/2+1))
+#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
+
+char *__stpcpy(char *d, const char *s)
+{
+	size_t *wd;
+	const size_t *ws;
+
+	if (((uintptr_t)s & ALIGN) == ((uintptr_t)d & ALIGN)) {
+		for (; (*d=*s) && ((uintptr_t)s & ALIGN); s++, d++);
+		if (!*s) return d;
+		wd=(void *)d; ws=(const void *)s;
+		for (; !HASZERO(*ws); *wd++ = *ws++);
+		d=(void *)wd; s=(const void *)ws;
+	}
+	for (; (*d=*s); s++, d++);
+
+	return d;
+}
+
+weak_alias(__stpcpy, stpcpy);