| 1 | /* rawmemchr - find a character in a memory zone |
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| 2 | |
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| 3 | Copyright (C) 2015-2024 Free Software Foundation, Inc. |
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| 4 | |
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| 5 | This file is part of the GNU C Library. |
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| 6 | |
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| 7 | The GNU C Library is free software; you can redistribute it and/or |
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| 8 | modify it under the terms of the GNU Lesser General Public |
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| 9 | License as published by the Free Software Foundation; either |
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| 10 | version 2.1 of the License, or (at your option) any later version. |
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| 11 | |
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| 12 | The GNU C Library is distributed in the hope that it will be useful, |
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | Lesser General Public License for more details. |
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| 16 | |
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| 17 | You should have received a copy of the GNU Lesser General Public |
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| 18 | License along with the GNU C Library. If not, see |
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| 19 | <https://www.gnu.org/licenses/>. */ |
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| 20 | |
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| 21 | #include <sysdep.h> |
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| 22 | |
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| 23 | /* Special case rawmemchr (s, 0) as strlen, otherwise tailcall memchr. |
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| 24 | Call strlen without setting up a full frame - it preserves x14/x15. |
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| 25 | */ |
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| 26 | |
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| 27 | ENTRY (__rawmemchr) |
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| 28 | cbz w1, L(do_strlen) |
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| 29 | mov x2, -1 |
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| 30 | b __memchr |
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| 31 | |
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| 32 | L(do_strlen): |
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| 33 | mov x15, x30 |
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| 34 | cfi_register (x30, x15) |
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| 35 | mov x14, x0 |
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| 36 | bl __strlen |
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| 37 | add x0, x14, x0 |
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| 38 | ret x15 |
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| 39 | |
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| 40 | END (__rawmemchr) |
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| 41 | weak_alias (__rawmemchr, rawmemchr) |
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| 42 | libc_hidden_builtin_def (__rawmemchr) |
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| 43 | |
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