From 50a6ca39ad4ed01922aa4f755f0ca579788226cf Mon Sep 17 00:00:00 2001
From: Thomas Martitz <kugel@rockbox.org>
Date: Thu, 6 May 2010 21:04:40 +0000
Subject: Move c/h files implementing/defining standard library stuff into a
 new libc directory, also standard'ify some parts of the code base (almost
 entirely #include fixes). This is to a) to cleanup firmware/common and
 firmware/include a bit, but also b) for Rockbox as an application which
 should use the host system's c library and headers, separating makes it easy
 to exclude our files from the build.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@25850 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/libc/strcpy.c | 99 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 firmware/libc/strcpy.c

(limited to 'firmware/libc/strcpy.c')

diff --git a/firmware/libc/strcpy.c b/firmware/libc/strcpy.c
new file mode 100644
index 0000000000..077ae73cc6
--- /dev/null
+++ b/firmware/libc/strcpy.c
@@ -0,0 +1,99 @@
+/*
+FUNCTION
+        <<strcpy>>---copy string
+
+INDEX
+        strcpy
+
+ANSI_SYNOPSIS
+        #include <string.h>
+        char *strcpy(char *<[dst]>, const char *<[src]>);
+
+TRAD_SYNOPSIS
+        #include <string.h>
+        char *strcpy(<[dst]>, <[src]>)
+        char *<[dst]>;
+        char *<[src]>;
+
+DESCRIPTION
+        <<strcpy>> copies the string pointed to by <[src]>
+        (including the terminating null character) to the array
+        pointed to by <[dst]>.
+
+RETURNS
+        This function returns the initial value of <[dst]>.
+
+PORTABILITY
+<<strcpy>> is ANSI C.
+
+<<strcpy>> requires no supporting OS subroutines.
+
+QUICKREF
+        strcpy ansi pure
+*/
+
+#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 (strcpy, (dst0, src0),
+        char *dst0 _AND
+        _CONST char *src0)
+{
+#if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__)
+  char *s = dst0;
+
+  while ((*dst0++ = *src0++))
+    ;
+
+  return s;
+#else
+  char *dst = dst0;
+  _CONST char *src = src0;
+  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;
+    }
+
+  while ((*dst++ = *src++))
+    ;
+  return dst0;
+#endif /* not PREFER_SIZE_OVER_SPEED */
+}
-- 
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