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/*
 * 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)