1 /* Copyright (C) 2000-2024 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library. If not, see
16 <https://www.gnu.org/licenses/>. */
18 /* Append no more than COUNT characters from the null-terminated string SRC
19 to the null-terminated string DST. Always null-terminate the new DST. */
37 mov a0, v0 # set up return value
38 beq a2, $zerocount # U :
39 /* Find the end of the string. */
40 ldq_u t0, 0(a0) # L : load first quadword (a0 may be misaligned)
43 insqh t1, v0, t1 # U :
44 andnot a0, 7, a0 # E :
50 cmpbge zero, t0, t1 # E : bits set iff byte == 0
53 $loop: ldq t0, 8(a0) # L :
55 cmpbge zero, t0, t1 # E :
58 $found: cttz t1, t2 # U0 :
60 jsr t9, __stxncpy # L0 : Now do the append.
62 /* Worry about the null termination. */
64 cttz t10, t2 # U0: byte offset of end-of-count.
65 bic a0, 7, a0 # E : word align the last write address.
66 zapnot t0, t8, t1 # U : was last byte a null?
74 0: addq t2, a0, a0 # E : address of end-of-count