1 //===-- Implementation of fscanf --------------------------------*- C++ -*-===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "src/stdio/fscanf.h" 10 11 #include "src/__support/File/file.h" 12 #include "src/__support/arg_list.h" 13 #include "src/stdio/scanf_core/vfscanf_internal.h" 14 15 #include <stdarg.h> 16 #include <stdio.h> 17 18 namespace LIBC_NAMESPACE { 19 20 LLVM_LIBC_FUNCTION(int, fscanf, 21 (::FILE *__restrict stream, const char *__restrict format, 22 ...)) { 23 va_list vlist; 24 va_start(vlist, format); 25 internal::ArgList args(vlist); // This holder class allows for easier copying 26 // and pointer semantics, as well as handling 27 // destruction automatically. 28 va_end(vlist); 29 int ret_val = scanf_core::vfscanf_internal(stream, format, args); 30 // This is done to avoid including stdio.h in the internals. On most systems 31 // EOF is -1, so this will be transformed into just "return ret_val". 32 return (ret_val == -1) ? EOF : ret_val; 33 } 34 35 } // namespace LIBC_NAMESPACE 36