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//===-- Implementation of wcpncpy -----------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/wchar/wcpncpy.h"
#include "hdr/types/size_t.h"
#include "hdr/types/wchar_t.h"
#include "src/__support/common.h"
#include "src/__support/macros/config.h"
#include "src/__support/macros/null_check.h"
namespace LIBC_NAMESPACE_DECL {
LLVM_LIBC_FUNCTION(wchar_t *, wcpncpy,
(wchar_t *__restrict s1, const wchar_t *__restrict s2,
size_t n)) {
if (n) {
LIBC_CRASH_ON_NULLPTR(s1);
LIBC_CRASH_ON_NULLPTR(s2);
}
size_t i;
// Copy up until \0 is found.
for (i = 0; i < n && s2[i] != '\0'; ++i)
s1[i] = s2[i];
// When n>strlen(src), n-strlen(src) \0 are appended.
for (size_t j = i; j < n; ++j)
s1[j] = L'\0';
// ...but our result points to the first \0 (if any).
return s1 + i;
}
} // namespace LIBC_NAMESPACE_DECL
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