| 1 | /* Copyright (C) 1996-2022 Free Software Foundation, Inc. |
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| 2 | This file is part of the GNU C Library. |
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| 3 | |
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| 4 | The GNU C Library is free software; you can redistribute it and/or |
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| 5 | modify it under the terms of the GNU Lesser General Public |
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| 6 | License as published by the Free Software Foundation; either |
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| 7 | version 2.1 of the License, or (at your option) any later version. |
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| 8 | |
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| 9 | The GNU C Library is distributed in the hope that it will be useful, |
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 12 | Lesser General Public License for more details. |
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| 13 | |
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| 14 | You should have received a copy of the GNU Lesser General Public |
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| 15 | License along with the GNU C Library; if not, see |
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| 16 | <https://www.gnu.org/licenses/>. */ |
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| 17 | |
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| 18 | #include <wchar.h> |
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| 19 | |
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| 20 | #define __need_ptrdiff_t |
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| 21 | #include <stddef.h> |
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| 22 | |
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| 23 | |
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| 24 | /* Copy SRC to DEST, returning the address of the terminating L'\0' in |
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| 25 | DEST. Check for overflows. */ |
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| 26 | wchar_t * |
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| 27 | __wcpcpy_chk (wchar_t *dest, const wchar_t *src, size_t destlen) |
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| 28 | { |
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| 29 | wchar_t *wcp = (wchar_t *) dest - 1; |
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| 30 | wint_t c; |
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| 31 | const ptrdiff_t off = src - dest + 1; |
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| 32 | |
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| 33 | do |
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| 34 | { |
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| 35 | if (__glibc_unlikely (destlen-- == 0)) |
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| 36 | __chk_fail (); |
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| 37 | c = wcp[off]; |
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| 38 | *++wcp = c; |
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| 39 | } |
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| 40 | while (c != L'\0'); |
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| 41 | |
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| 42 | return wcp; |
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| 43 | } |
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| 44 | |
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