1 | /* Copyright (C) 2000-2022 Free Software Foundation, Inc. |
2 | This file is part of the GNU C Library. |
3 | |
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. |
8 | |
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. |
13 | |
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/>. */ |
17 | |
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. */ |
20 | |
21 | #include <sysdep.h> |
22 | |
23 | .arch ev6 |
24 | .set noreorder |
25 | .text |
26 | |
27 | ENTRY(strncat) |
28 | ldgp gp, 0(pv) |
29 | #ifdef PROF |
30 | .set noat |
31 | lda AT, _mcount |
32 | jsr AT, (AT), _mcount |
33 | .set at |
34 | #endif |
35 | .prologue 1 |
36 | |
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) |
41 | lda t1, -1 # E : |
42 | |
43 | insqh t1, v0, t1 # U : |
44 | andnot a0, 7, a0 # E : |
45 | nop # E : |
46 | or t1, t0, t0 # E : |
47 | |
48 | nop # E : |
49 | nop # E : |
50 | cmpbge zero, t0, t1 # E : bits set iff byte == 0 |
51 | bne t1, $found # U : |
52 | |
53 | $loop: ldq t0, 8(a0) # L : |
54 | addq a0, 8, a0 # E : |
55 | cmpbge zero, t0, t1 # E : |
56 | beq t1, $loop # U : |
57 | |
58 | $found: cttz t1, t2 # U0 : |
59 | addq a0, t2, a0 # E : |
60 | jsr t9, __stxncpy # L0 : Now do the append. |
61 | |
62 | /* Worry about the null termination. */ |
63 | |
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? |
67 | nop # E : |
68 | |
69 | bne t1, 0f # U : |
70 | nop # E : |
71 | nop # E : |
72 | ret # L0 : |
73 | |
74 | 0: addq t2, a0, a0 # E : address of end-of-count |
75 | stb zero, 1(a0) # L : |
76 | nop # E : |
77 | ret # L0 : |
78 | |
79 | $zerocount: |
80 | nop # E : |
81 | nop # E : |
82 | nop # E : |
83 | ret # L0 : |
84 | |
85 | END(strncat) |
86 | |