Subversion Repositories openrisc_2011-10-31

/*******************************************************************************
 * 
 * Copyright (c) 1993 Intel Corporation
 * 
 * Intel hereby grants you permission to copy, modify, and distribute this
 * software and its documentation.  Intel grants this permission provided
 * that the above copyright notice appears in all copies and that both the
 * copyright notice and this permission notice appear in supporting
 * documentation.  In addition, Intel grants this permission provided that
 * you prominently mark as "not part of the original" any modifications
 * made to this software or documentation, and that the name of Intel
 * Corporation not be used in advertising or publicity pertaining to
 * distribution of the software or the documentation without specific,
 * written prior permission.
 * 
 * Intel Corporation provides this AS IS, WITHOUT ANY WARRANTY, EXPRESS OR
 * IMPLIED, INCLUDING, WITHOUT LIMITATION, ANY WARRANTY OF MERCHANTABILITY
 * OR FITNESS FOR A PARTICULAR PURPOSE.  Intel makes no guarantee or
 * representations regarding the use of, or the results of the use of,
 * the software and documentation in terms of correctness, accuracy,
 * reliability, currentness, or otherwise; and you rely on the software,
 * documentation and results solely at your own risk.
 *
 * IN NO EVENT SHALL INTEL BE LIABLE FOR ANY LOSS OF USE, LOSS OF BUSINESS,
 * LOSS OF PROFITS, INDIRECT, INCIDENTAL, SPECIAL OR CONSEQUENTIAL DAMAGES
 * OF ANY KIND.  IN NO EVENT SHALL INTEL'S TOTAL LIABILITY EXCEED THE SUM
 * PAID TO INTEL FOR THE PRODUCT LICENSED HEREUNDER.
 * 
 ******************************************************************************/

        .file "strdup.s"
#ifdef  __PIC
        .pic
#endif
#ifdef  __PID
        .pid
#endif

/*
 * (c) copyright 1989,1993 Intel Corp., all rights reserved
 */

/*
        procedure strdup  (optimized assembler version: 80960K series, 80960CA)

        dest_addr = strdup (src_addr)

        Allocate memory and copy thereto the string pointed to by src_addr.
        Return the address of the copy, or null if unable to perform the
        operation.
*/

        .text
        .align  2
        .globl  _strdup
_strdup:
        mov     g0,r3           # Keep a copy of the original string addr
        callj   _strlen         # Determine how much to allocate
        addo    1,g0,g0         # Add one byte for the null byte at end
        callj   _malloc         # Allocate the storage
        cmpo    0,g0
        mov     r3,g1           # Original string addr is now src for copy
        bne.t   _strcpy         # Jump if allocation was successful
        ret                     # Return the null ptr otherwise

/* end of strdup */