1 files changed, 91 insertions, 0 deletions
diff --git a/newlib/libc/string/stpcpy.c b/newlib/libc/string/stpcpy.c
new file mode 100644
index 000000000..62fe79997
--- /dev/null
+++ b/newlib/libc/string/stpcpy.c
@@ -0,0 +1,91 @@
+/*
+FUNCTION
+	<<stpcpy>>---copy string returning a pointer to its end
+
+INDEX
+	stpcpy
+
+ANSI_SYNOPSIS
+	#include <string.h>
+	char *stpcpy(char *<[dst]>, const char *<[src]>);
+
+TRAD_SYNOPSIS
+	#include <string.h>
+	char *stpcpy(<[dst]>, <[src]>)
+	char *<[dst]>;
+	char *<[src]>;
+
+DESCRIPTION
+	<<stpcpy>> copies the string pointed to by <[src]>
+	(including the terminating null character) to the array
+	pointed to by <[dst]>.
+
+RETURNS
+	This function returns a pointer to the end of the destination string,
+	thus pointing to the trailing '\0'.
+
+PORTABILITY
+<<stpcpy>> is a GNU extension, candidate for inclusion into POSIX/SUSv4.
+
+<<stpcpy>> requires no supporting OS subroutines.
+
+QUICKREF
+	stpcpy gnu
+*/
+
+#include <string.h>
+#include <limits.h>
+
+/*SUPPRESS 560*/
+/*SUPPRESS 530*/
+
+/* Nonzero if either X or Y is not aligned on a "long" boundary.  */
+#define UNALIGNED(X, Y) \
+  (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1)))
+
+#if LONG_MAX == 2147483647L
+#define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080)
+#else
+#if LONG_MAX == 9223372036854775807L
+/* Nonzero if X (a long int) contains a NULL byte. */
+#define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080)
+#else
+#error long int is not a 32bit or 64bit type.
+#endif
+#endif
+
+#ifndef DETECTNULL
+#error long int is not a 32bit or 64bit byte
+#endif
+
+char*
+_DEFUN (stpcpy, (dst, src),
+	char *dst _AND
+	_CONST char *src)
+{
+#if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__)
+  long *aligned_dst;
+  _CONST long *aligned_src;
+
+  /* If SRC or DEST is unaligned, then copy bytes.  */
+  if (!UNALIGNED (src, dst))
+    {
+      aligned_dst = (long*)dst;
+      aligned_src = (long*)src;
+
+      /* SRC and DEST are both "long int" aligned, try to do "long int"
+         sized copies.  */
+      while (!DETECTNULL(*aligned_src))
+        {
+          *aligned_dst++ = *aligned_src++;
+        }
+
+      dst = (char*)aligned_dst;
+      src = (char*)aligned_src;
+    }
+#endif /* not PREFER_SIZE_OVER_SPEED */
+
+  while ((*dst++ = *src++))
+    ;
+  return --dst;
+}