| /* Copyright (C) 2000-2014 Free Software Foundation, Inc. |
| Contributed by Richard Henderson <rth@tamu.edu>, 1996. |
| EV67 optimized by Rick Gorton <rick.gorton@alpha-processor.com>. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library. If not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| /* Append no more than COUNT characters from the null-terminated string SRC |
| to the null-terminated string DST. Always null-terminate the new DST. */ |
| |
| #include <sysdep.h> |
| |
| .arch ev6 |
| .set noreorder |
| .text |
| |
| ENTRY(strncat) |
| ldgp gp, 0(pv) |
| #ifdef PROF |
| .set noat |
| lda AT, _mcount |
| jsr AT, (AT), _mcount |
| .set at |
| #endif |
| .prologue 1 |
| |
| mov a0, v0 # set up return value |
| beq a2, $zerocount # U : |
| /* Find the end of the string. */ |
| ldq_u t0, 0(a0) # L : load first quadword (a0 may be misaligned) |
| lda t1, -1 # E : |
| |
| insqh t1, v0, t1 # U : |
| andnot a0, 7, a0 # E : |
| nop # E : |
| or t1, t0, t0 # E : |
| |
| nop # E : |
| nop # E : |
| cmpbge zero, t0, t1 # E : bits set iff byte == 0 |
| bne t1, $found # U : |
| |
| $loop: ldq t0, 8(a0) # L : |
| addq a0, 8, a0 # E : |
| cmpbge zero, t0, t1 # E : |
| beq t1, $loop # U : |
| |
| $found: cttz t1, t2 # U0 : |
| addq a0, t2, a0 # E : |
| jsr t9, __stxncpy # L0 : Now do the append. |
| |
| /* Worry about the null termination. */ |
| |
| cttz t10, t2 # U0: byte offset of end-of-count. |
| bic a0, 7, a0 # E : word align the last write address. |
| zapnot t0, t8, t1 # U : was last byte a null? |
| nop # E : |
| |
| bne t1, 0f # U : |
| nop # E : |
| nop # E : |
| ret # L0 : |
| |
| 0: addq t2, a0, a0 # E : address of end-of-count |
| stb zero, 1(a0) # L : |
| nop # E : |
| ret # L0 : |
| |
| $zerocount: |
| nop # E : |
| nop # E : |
| nop # E : |
| ret # L0 : |
| |
| END(strncat) |
