| 1 | //===-- Implementation of sscanf --------------------------------*- 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/sscanf.h" |
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| 10 | |
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| 11 | #include "src/__support/CPP/limits.h" |
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| 12 | #include "src/__support/arg_list.h" |
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| 13 | #include "src/stdio/scanf_core/reader.h" |
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| 14 | #include "src/stdio/scanf_core/scanf_main.h" |
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| 15 | |
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| 16 | #include <stdarg.h> |
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| 17 | #include <stdio.h> |
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| 18 | |
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| 19 | namespace LIBC_NAMESPACE { |
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| 20 | |
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| 21 | LLVM_LIBC_FUNCTION(int, sscanf, |
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| 22 | (const char *__restrict buffer, |
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| 23 | const char *__restrict format, ...)) { |
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| 24 | va_list vlist; |
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| 25 | va_start(vlist, format); |
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| 26 | internal::ArgList args(vlist); // This holder class allows for easier copying |
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| 27 | // and pointer semantics, as well as handling |
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| 28 | // destruction automatically. |
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| 29 | va_end(vlist); |
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| 30 | scanf_core::ReadBuffer rb{.buffer: const_cast<char *>(buffer), |
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| 31 | .buff_len: cpp::numeric_limits<size_t>::max()}; |
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| 32 | scanf_core::Reader reader(&rb); |
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| 33 | int ret_val = scanf_core::scanf_main(reader: &reader, str: format, args); |
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| 34 | // This is done to avoid including stdio.h in the internals. On most systems |
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| 35 | // EOF is -1, so this will be transformed into just "return ret_val". |
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| 36 | return (ret_val == -1) ? EOF : ret_val; |
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| 37 | } |
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| 38 | |
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| 39 | } // namespace LIBC_NAMESPACE |
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| 40 | |
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