136991d83SMichael Jones //===-- Implementation of sscanf --------------------------------*- 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/sscanf.h" 1036991d83SMichael Jones 11a5a008ffSmichaelrj-google #include "src/__support/CPP/limits.h" 1236991d83SMichael Jones #include "src/__support/arg_list.h" 135ff3ff33SPetr Hosek #include "src/__support/macros/config.h" 1436991d83SMichael Jones #include "src/stdio/scanf_core/reader.h" 1536991d83SMichael Jones #include "src/stdio/scanf_core/scanf_main.h" 1636991d83SMichael Jones 175aed6d67SMichael Jones #include "hdr/stdio_macros.h" 185aed6d67SMichael Jones #include "hdr/types/FILE.h" 1936991d83SMichael Jones #include <stdarg.h> 2036991d83SMichael Jones 215ff3ff33SPetr Hosek namespace LIBC_NAMESPACE_DECL { 2236991d83SMichael Jones 2336991d83SMichael Jones LLVM_LIBC_FUNCTION(int, sscanf, 2436991d83SMichael Jones (const char *__restrict buffer, 2536991d83SMichael Jones const char *__restrict format, ...)) { 2636991d83SMichael Jones va_list vlist; 2736991d83SMichael Jones va_start(vlist, format); 2836991d83SMichael Jones internal::ArgList args(vlist); // This holder class allows for easier copying 2936991d83SMichael Jones // and pointer semantics, as well as handling 3036991d83SMichael Jones // destruction automatically. 3136991d83SMichael Jones va_end(vlist); 32*1ae0dae3SMichael Jones scanf_core::ReadBuffer rb{buffer, cpp::numeric_limits<size_t>::max()}; 33a5a008ffSmichaelrj-google scanf_core::Reader reader(&rb); 3436991d83SMichael Jones int ret_val = scanf_core::scanf_main(&reader, format, args); 3536991d83SMichael Jones // This is done to avoid including stdio.h in the internals. On most systems 3636991d83SMichael Jones // EOF is -1, so this will be transformed into just "return ret_val". 3736991d83SMichael Jones return (ret_val == -1) ? EOF : ret_val; 3836991d83SMichael Jones } 3936991d83SMichael Jones 405ff3ff33SPetr Hosek } // namespace LIBC_NAMESPACE_DECL 41