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b168057a | 1 | /* Copyright (C) 2000-2015 Free Software Foundation, Inc. |
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2 | Contributed by Richard Henderson <rth@tamu.edu>, 1996. |
3 | EV67 optimized by Rick Gorton <rick.gorton@alpha-processor.com>. | |
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4 | This file is part of the GNU C Library. |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
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7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
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10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
3214b89b | 14 | Lesser General Public License for more details. |
4eae4d05 | 15 | |
3214b89b | 16 | You should have received a copy of the GNU Lesser General Public |
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17 | License along with the GNU C Library. If not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
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19 | |
20 | /* Append no more than COUNT characters from the null-terminated string SRC | |
21 | to the null-terminated string DST. Always null-terminate the new DST. */ | |
22 | ||
23 | #include <sysdep.h> | |
24 | ||
25 | .arch ev6 | |
26 | .set noreorder | |
27 | .text | |
28 | ||
29 | ENTRY(strncat) | |
30 | ldgp gp, 0(pv) | |
31 | #ifdef PROF | |
32 | .set noat | |
33 | lda AT, _mcount | |
34 | jsr AT, (AT), _mcount | |
35 | .set at | |
36 | #endif | |
37 | .prologue 1 | |
38 | ||
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39 | mov a0, v0 # set up return value |
40 | beq a2, $zerocount # U : | |
4eae4d05 | 41 | /* Find the end of the string. */ |
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42 | ldq_u t0, 0(a0) # L : load first quadword (a0 may be misaligned) |
43 | lda t1, -1 # E : | |
4eae4d05 | 44 | |
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45 | insqh t1, v0, t1 # U : |
46 | andnot a0, 7, a0 # E : | |
4eae4d05 | 47 | nop # E : |
22fea1a1 | 48 | or t1, t0, t0 # E : |
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49 | |
50 | nop # E : | |
51 | nop # E : | |
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52 | cmpbge zero, t0, t1 # E : bits set iff byte == 0 |
53 | bne t1, $found # U : | |
4eae4d05 | 54 | |
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55 | $loop: ldq t0, 8(a0) # L : |
56 | addq a0, 8, a0 # E : | |
57 | cmpbge zero, t0, t1 # E : | |
58 | beq t1, $loop # U : | |
4eae4d05 | 59 | |
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60 | $found: cttz t1, t2 # U0 : |
61 | addq a0, t2, a0 # E : | |
62 | jsr t9, __stxncpy # L0 : Now do the append. | |
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63 | |
64 | /* Worry about the null termination. */ | |
65 | ||
22fea1a1 | 66 | cttz t10, t2 # U0: byte offset of end-of-count. |
d335db0e | 67 | bic a0, 7, a0 # E : word align the last write address. |
22fea1a1 | 68 | zapnot t0, t8, t1 # U : was last byte a null? |
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69 | nop # E : |
70 | ||
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71 | bne t1, 0f # U : |
72 | nop # E : | |
4eae4d05 | 73 | nop # E : |
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74 | ret # L0 : |
75 | ||
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76 | 0: addq t2, a0, a0 # E : address of end-of-count |
77 | stb zero, 1(a0) # L : | |
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78 | nop # E : |
79 | ret # L0 : | |
80 | ||
81 | $zerocount: | |
82 | nop # E : | |
83 | nop # E : | |
84 | nop # E : | |
85 | ret # L0 : | |
86 | ||
87 | END(strncat) |