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//===-- Implementation of wcstok ------------------------------------------===//
//
// 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/wcstok.h"
#include "hdr/types/wchar_t.h"
#include "src/__support/common.h"
namespace LIBC_NAMESPACE_DECL {
bool isADelimeter(wchar_t wc, const wchar_t *delimiters) {
for (const wchar_t *delim_ptr = delimiters; *delim_ptr != L'\0'; ++delim_ptr)
if (wc == *delim_ptr)
return true;
return false;
}
LLVM_LIBC_FUNCTION(wchar_t *, wcstok,
(wchar_t *__restrict str, const wchar_t *__restrict delim,
wchar_t **__restrict context)) {
if (str == nullptr) {
if (*context == nullptr)
return nullptr;
str = *context;
}
wchar_t *tok_start, *tok_end;
for (tok_start = str; *tok_start != L'\0' && isADelimeter(*tok_start, delim);
++tok_start)
;
for (tok_end = tok_start; *tok_end != L'\0' && !isADelimeter(*tok_end, delim);
++tok_end)
;
if (*tok_end != L'\0') {
*tok_end = L'\0';
++tok_end;
}
*context = tok_end;
return *tok_start == L'\0' ? nullptr : tok_start;
}
} // namespace LIBC_NAMESPACE_DECL
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