initial import

1 files changed, 48 insertions, 0 deletions

diff --git a/sysdeps/i386/memchr.c b/sysdeps/i386/memchr.c
new file mode 100644
index 0000000000..ff0f8d9044
--- /dev/null
+++ b/sysdeps/i386/memchr.c
@@ -0,0 +1,48 @@
+/* memchr (str, ch, n) -- Return pointer to first occurrence of CH in STR less
+   than N.
+   For Intel 80x86, x>=3.
+   Copyright (C) 1991, 1992, 1993 Free Software Foundation, Inc.
+   Contributed by Torbjorn Granlund (tege@sics.se).
+
+The GNU C Library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public License as
+published by the Free Software Foundation; either version 2 of the
+License, or (at your option) any later version.
+
+The GNU C Library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with the GNU C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <string.h>
+
+#ifdef	__GNUC__
+
+PTR
+DEFUN(memchr, (str, c, len),
+      CONST PTR str AND int c AND size_t len)
+{
+  PTR retval;
+  asm("cld\n"			/* Search forward.  */
+      "testl %1,%1\n"		/* Clear Z flag, to handle LEN == 0.  */
+      /* Some old versions of gas need `repne' instead of `repnz'.  */
+      "repnz\n"			/* Search for C in al.  */
+      "scasb\n"
+      "movl %2,%0\n"		/* Set %0 to 0 (without affecting Z flag).  */
+      "jnz done\n"		/* Jump if we found nothing equal to C.  */
+      "leal -1(%1),%0\n"	/* edi has been incremented.  Return edi-1.  */
+      "done:" :
+      "=a" (retval), "=D" (str), "=c" (len) :
+      "0" (c), "1" (str), "2" (len));
+  return retval;
+}
+
+#else
+#include <sysdeps/generic/memchr.c>
+#endif