36991d8342
This patch adds scanf, sscanf, and fscanf entrypoints. It also adds unit tests for sscanf and a basic test to fscanf. The scanf function is basically impossible to test in an automated fashion due to it recieving user input. Reviewed By: sivachandra, lntue Differential Revision: https://reviews.llvm.org/D138076
39 lines
1.4 KiB
C++
39 lines
1.4 KiB
C++
//===-- Implementation of sscanf --------------------------------*- 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/sscanf.h"
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#include "src/__support/arg_list.h"
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#include "src/stdio/scanf_core/reader.h"
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#include "src/stdio/scanf_core/scanf_main.h"
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#include "src/stdio/scanf_core/string_reader.h"
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#include <stdarg.h>
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#include <stdio.h>
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namespace __llvm_libc {
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LLVM_LIBC_FUNCTION(int, sscanf,
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(const char *__restrict buffer,
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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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scanf_core::StringReader string_reader(buffer);
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scanf_core::Reader reader(&string_reader);
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int ret_val = scanf_core::scanf_main(&reader, format, args);
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// This is done to avoid including stdio.h in the internals. On most systems
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// EOF is -1, so this will be transformed into just "return ret_val".
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return (ret_val == -1) ? EOF : ret_val;
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}
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} // namespace __llvm_libc
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