1 //===-- Implementation of vsscanf -------------------------------*- 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/vsscanf.h" 10 11 #include "hdr/stdio_macros.h" 12 #include "src/__support/CPP/limits.h" 13 #include "src/__support/arg_list.h" 14 #include "src/stdio/scanf_core/reader.h" 15 #include "src/stdio/scanf_core/scanf_main.h" 16 17 #include <stdarg.h> 18 19 namespace LIBC_NAMESPACE_DECL { 20 21 LLVM_LIBC_FUNCTION(int, vsscanf, 22 (const char *buffer, const char *format, va_list vlist)) { 23 internal::ArgList args(vlist); 24 scanf_core::ReadBuffer rb{const_cast<char *>(buffer), 25 cpp::numeric_limits<size_t>::max()}; 26 scanf_core::Reader reader(&rb); 27 int ret_val = scanf_core::scanf_main(&reader, format, args); 28 // This is done to avoid including stdio.h in the internals. On most systems 29 // EOF is -1, so this will be transformed into just "return ret_val". 30 return (ret_val == -1) ? EOF : ret_val; 31 } 32 33 } // namespace LIBC_NAMESPACE_DECL 34