Warning: That file was not part of the compilation database. It may have many parsing errors.

1/* Copyright (C) 1996-2019 Free Software Foundation, Inc.
2 Contributed by Richard Henderson (rth@tamu.edu)
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
18
19/* Copy no more than COUNT bytes of the null-terminated string from
20 SRC to DST. If SRC does not cover all of COUNT, the balance is
21 zeroed. */
22
23#include <sysdep.h>
24
25 .set noat
26 .set noreorder
27
28 .text
29
30ENTRY(strncpy)
31 ldgp gp, 0(pv)
32#ifdef PROF
33 lda AT, _mcount
34 jsr AT, (AT), _mcount
35#endif
36 .prologue 1
37
38 mov a0, v0 # set return value now
39 beq a2, $zerocount
40 jsr t9, __stxncpy # do the work of the copy
41
42 bne a2, $multiword # do we have full words left?
43
44 .align 3
45 subq t8, 1, t2 # e0 : guess not
46 subq t10, 1, t3 # .. e1 :
47 or t2, t8, t2 # e0 : clear the bits between the last
48 or t3, t10, t3 # .. e1 : written byte and the last byte in
49 andnot t3, t2, t3 # e0 : COUNT
50 zap t0, t3, t0 # e1 :
51 stq_u t0, 0(a0) # e0 :
52 ret # .. e1 :
53
54$multiword:
55 subq t8, 1, t7 # e0 : clear the final bits in the prev
56 or t7, t8, t7 # e1 : word
57 zapnot t0, t7, t0 # e0 :
58 subq a2, 1, a2 # .. e1 :
59 stq_u t0, 0(a0) # e0 :
60 addq a0, 8, a0 # .. e1 :
61
62 beq a2, 1f # e1 :
63 blbc a2, 0f # e1 :
64
65 stq_u zero, 0(a0) # e0 : zero one word
66 subq a2, 1, a2 # .. e1 :
67 addq a0, 8, a0 # e0 :
68 beq a2, 1f # .. e1 :
69
700: stq_u zero, 0(a0) # e0 : zero two words
71 subq a2, 2, a2 # .. e1 :
72 stq_u zero, 8(a0) # e0 :
73 addq a0, 16, a0 # .. e1 :
74 bne a2, 0b # e1 :
75 unop
76
771: ldq_u t0, 0(a0) # e0 : clear the leading bits in the final
78 subq t10, 1, t7 # .. e1 : word
79 or t7, t10, t7 # e0 :
80 zap t0, t7, t0 # e1 (stall)
81 stq_u t0, 0(a0) # e0 :
82
83$zerocount:
84 ret # .. e1 :
85
86 END(strncpy)
87libc_hidden_builtin_def (strncpy)
88

Warning: That file was not part of the compilation database. It may have many parsing errors.