| 1 | //===-- Implementation of vsnprintf -----------------------------*- C++ -*-===// |
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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/stdio/vsnprintf.h" |
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| 10 | |
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| 11 | #include "src/__support/arg_list.h" |
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| 12 | #include "src/__support/macros/config.h" |
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| 13 | #include "src/stdio/printf_core/printf_main.h" |
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| 14 | #include "src/stdio/printf_core/writer.h" |
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| 15 | |
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| 16 | #include <stdarg.h> |
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| 17 | #include <stddef.h> |
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| 18 | |
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| 19 | namespace LIBC_NAMESPACE_DECL { |
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| 20 | |
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| 21 | LLVM_LIBC_FUNCTION(int, vsnprintf, |
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| 22 | (char *__restrict buffer, size_t buffsz, |
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| 23 | const char *__restrict format, va_list vlist)) { |
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| 24 | internal::ArgList args(vlist); // This holder class allows for easier copying |
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| 25 | // and pointer semantics, as well as handling |
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| 26 | // destruction automatically. |
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| 27 | printf_core::WriteBuffer<printf_core::Mode< |
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| 28 | printf_core::WriteMode::FILL_BUFF_AND_DROP_OVERFLOW>::value> |
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| 29 | wb(buffer, (buffsz > 0 ? buffsz - 1 : 0)); |
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| 30 | printf_core::Writer writer(wb); |
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| 31 | |
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| 32 | int ret_val = printf_core::printf_main(&writer, format, args); |
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| 33 | if (buffsz > 0) // if the buffsz is 0 the buffer may be a null pointer. |
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| 34 | wb.buff[wb.buff_cur] = '\0'; |
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| 35 | return ret_val; |
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| 36 | } |
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| 37 | |
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| 38 | } // namespace LIBC_NAMESPACE_DECL |
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| 39 | |
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