projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 04277e02 | 1 | /* Copyright (C) 1996-2019 Free Software Foundation, Inc. |
| cf182b58 | 2 | Contributed by Richard Henderson (rth@tamu.edu) |
| db31c863 UD |
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 | |
| 3214b89b AJ |
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. | |
| db31c863 UD |
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 | |
| 3214b89b | 13 | Lesser General Public License for more details. |
| db31c863 | 14 | |
| 3214b89b | 15 | You should have received a copy of the GNU Lesser General Public |
| ab84e3ff | 16 | License along with the GNU C Library. If not, see |
| 5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
| cf182b58 UD |
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 | ||
| 30 | ENTRY(strncpy) | |
| 31 | ldgp gp, 0(pv) | |
| 60c74cf0 UD |
32 | #ifdef PROF |
| 33 | lda AT, _mcount | |
| 34 | jsr AT, (AT), _mcount | |
| 35 | #endif | |
| cf182b58 UD |
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: | |
| cf182b58 UD |
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 | ||
| 70 | 0: 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 | ||
| 77 | 1: 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) | |
| 79b7c863 | 87 | libc_hidden_builtin_def (strncpy) |