/*
   * Just like strncpy() except that if a fault occurs during copying,
   * -EFAULT is returned.
   *
   * Inputs:
   *	in0:	address of destination buffer
   *	in1:	address of string to be copied
   *	in2:	length of buffer in bytes
   * Outputs:
   *	r8:	-EFAULT in case of fault or number of bytes copied if no fault
   *
   * Copyright (C) 1998-2001 Hewlett-Packard Co
   * Copyright (C) 1998-2001 David Mosberger-Tang <davidm@hpl.hp.com>
   *
   * 00/03/06 D. Mosberger Fixed to return proper return value (bug found by
   *			 by Andreas Schwab <schwab@suse.de>).
   */
  
  #include <asm/asmmacro.h>
  
  GLOBAL_ENTRY(__strncpy_from_user)
  	alloc r2=ar.pfs,3,0,0,0
  	mov r8=0
  	mov r9=in1
  	;;
  	add r10=in1,in2
  	cmp.eq p6,p0=r0,in2
  (p6)	br.ret.spnt.many rp
  
  	// XXX braindead copy loop---this needs to be optimized
  .Loop1:
  	EX(.Lexit, ld1 r8=[in1],1)
  	;;
  	EX(.Lexit, st1 [in0]=r8,1)
  	cmp.ne p6,p7=r8,r0
  	;;
  (p6)	cmp.ne.unc p8,p0=in1,r10
  (p8)	br.cond.dpnt.few .Loop1
  	;;
  (p6)	mov r8=in2		// buffer filled up---return buffer length
  (p7)	sub r8=in1,r9,1		// return string length (excluding NUL character)
  [.Lexit:]
  	br.ret.sptk.many rp
  END(__strncpy_from_user)