| 1 | //===-- Implementation of wcpncpy -----------------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/wchar/wcpncpy.h" |
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| 10 | |
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| 11 | #include "hdr/types/size_t.h" |
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| 12 | #include "hdr/types/wchar_t.h" |
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| 13 | #include "src/__support/common.h" |
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| 14 | #include "src/__support/macros/config.h" |
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| 15 | #include "src/__support/macros/null_check.h" |
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| 16 | |
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| 17 | namespace LIBC_NAMESPACE_DECL { |
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| 18 | |
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| 19 | LLVM_LIBC_FUNCTION(wchar_t *, wcpncpy, |
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| 20 | (wchar_t *__restrict s1, const wchar_t *__restrict s2, |
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| 21 | size_t n)) { |
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| 22 | if (n) { |
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| 23 | LIBC_CRASH_ON_NULLPTR(s1); |
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| 24 | LIBC_CRASH_ON_NULLPTR(s2); |
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| 25 | } |
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| 26 | size_t i; |
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| 27 | // Copy up until \0 is found. |
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| 28 | for (i = 0; i < n && s2[i] != '\0'; ++i) |
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| 29 | s1[i] = s2[i]; |
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| 30 | // When n>strlen(src), n-strlen(src) \0 are appended. |
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| 31 | for (size_t j = i; j < n; ++j) |
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| 32 | s1[j] = L'\0'; |
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| 33 | // ...but our result points to the first \0 (if any). |
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| 34 | return s1 + i; |
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| 35 | } |
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| 36 | |
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| 37 | } // namespace LIBC_NAMESPACE_DECL |
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| 38 | |
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