136991d83SMichael Jones //===-- Implementation of scanf ---------------------------------*- C++ -*-===// 236991d83SMichael Jones // 336991d83SMichael Jones // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 436991d83SMichael Jones // See https://llvm.org/LICENSE.txt for license information. 536991d83SMichael Jones // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 636991d83SMichael Jones // 736991d83SMichael Jones //===----------------------------------------------------------------------===// 836991d83SMichael Jones 936991d83SMichael Jones #include "src/stdio/scanf.h" 1036991d83SMichael Jones 1136991d83SMichael Jones #include "src/__support/File/file.h" 1236991d83SMichael Jones #include "src/__support/arg_list.h" 13*5ff3ff33SPetr Hosek #include "src/__support/macros/config.h" 1436991d83SMichael Jones #include "src/stdio/scanf_core/vfscanf_internal.h" 1536991d83SMichael Jones 165aed6d67SMichael Jones #include "hdr/types/FILE.h" 1736991d83SMichael Jones #include <stdarg.h> 1836991d83SMichael Jones 19a5a008ffSmichaelrj-google #ifndef LIBC_COPT_STDIO_USE_SYSTEM_FILE 20b6bc9d72SGuillaume Chatelet #define SCANF_STDIN LIBC_NAMESPACE::stdin 21a5a008ffSmichaelrj-google #else // LIBC_COPT_STDIO_USE_SYSTEM_FILE 22a5a008ffSmichaelrj-google #define SCANF_STDIN ::stdin 23a5a008ffSmichaelrj-google #endif // LIBC_COPT_STDIO_USE_SYSTEM_FILE 24a5a008ffSmichaelrj-google 25*5ff3ff33SPetr Hosek namespace LIBC_NAMESPACE_DECL { 2636991d83SMichael Jones 2736991d83SMichael Jones LLVM_LIBC_FUNCTION(int, scanf, (const char *__restrict format, ...)) { 2836991d83SMichael Jones va_list vlist; 2936991d83SMichael Jones va_start(vlist, format); 3036991d83SMichael Jones internal::ArgList args(vlist); // This holder class allows for easier copying 3136991d83SMichael Jones // and pointer semantics, as well as handling 3236991d83SMichael Jones // destruction automatically. 3336991d83SMichael Jones va_end(vlist); 3436991d83SMichael Jones int ret_val = scanf_core::vfscanf_internal( 35a5a008ffSmichaelrj-google reinterpret_cast<::FILE *>(SCANF_STDIN), format, args); 3636991d83SMichael Jones // This is done to avoid including stdio.h in the internals. On most systems 3736991d83SMichael Jones // EOF is -1, so this will be transformed into just "return ret_val". 3836991d83SMichael Jones return (ret_val == -1) ? EOF : ret_val; 3936991d83SMichael Jones } 4036991d83SMichael Jones 41*5ff3ff33SPetr Hosek } // namespace LIBC_NAMESPACE_DECL 42