ff365ce1d7
Reverts llvm/llvm-project#146752, which was a revert of my accidental push, so we can actually review and presubmit this time.
38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
//===-- Implementation of wcpncpy -----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/wchar/wcpncpy.h"
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#include "hdr/types/size_t.h"
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#include "hdr/types/wchar_t.h"
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#include "src/__support/common.h"
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#include "src/__support/macros/config.h"
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#include "src/__support/macros/null_check.h"
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namespace LIBC_NAMESPACE_DECL {
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LLVM_LIBC_FUNCTION(wchar_t *, wcpncpy,
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(wchar_t *__restrict s1, const wchar_t *__restrict s2,
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size_t n)) {
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if (n) {
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LIBC_CRASH_ON_NULLPTR(s1);
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LIBC_CRASH_ON_NULLPTR(s2);
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}
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size_t i;
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// Copy up until \0 is found.
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for (i = 0; i < n && s2[i] != '\0'; ++i)
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s1[i] = s2[i];
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// When n>strlen(src), n-strlen(src) \0 are appended.
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for (size_t j = i; j < n; ++j)
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s1[j] = L'\0';
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// ...but our result points to the first \0 (if any).
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return s1 + i;
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}
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} // namespace LIBC_NAMESPACE_DECL
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