b6bc9d72f6
This is step 4 of https://discourse.llvm.org/t/rfc-customizable-namespace-to-allow-testing-the-libc-when-the-system-libc-is-also-llvms-libc/73079
39 lines
1.3 KiB
C++
39 lines
1.3 KiB
C++
//===-- Implementation of snprintf ------------------------------*- C++ -*-===//
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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/stdio/snprintf.h"
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#include "src/__support/arg_list.h"
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#include "src/stdio/printf_core/printf_main.h"
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#include "src/stdio/printf_core/writer.h"
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#include <stdarg.h>
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#include <stddef.h>
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namespace LIBC_NAMESPACE {
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LLVM_LIBC_FUNCTION(int, snprintf,
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(char *__restrict buffer, size_t buffsz,
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const char *__restrict format, ...)) {
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va_list vlist;
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va_start(vlist, format);
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internal::ArgList args(vlist); // This holder class allows for easier copying
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// and pointer semantics, as well as handling
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// destruction automatically.
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va_end(vlist);
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printf_core::WriteBuffer wb(buffer, (buffsz > 0 ? buffsz - 1 : 0));
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printf_core::Writer writer(&wb);
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int ret_val = printf_core::printf_main(&writer, format, args);
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if (buffsz > 0) // if the buffsz is 0 the buffer may be a null pointer.
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wb.buff[wb.buff_cur] = '\0';
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return ret_val;
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}
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} // namespace LIBC_NAMESPACE
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