1 //===-- Starting point for scanf --------------------------------*- 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/scanf_core/scanf_main.h" 10 11 #include "src/__support/arg_list.h" 12 #include "src/stdio/scanf_core/converter.h" 13 #include "src/stdio/scanf_core/core_structs.h" 14 #include "src/stdio/scanf_core/parser.h" 15 #include "src/stdio/scanf_core/reader.h" 16 17 #include <stddef.h> 18 19 namespace LIBC_NAMESPACE { 20 namespace scanf_core { 21 scanf_main(Reader * reader,const char * __restrict str,internal::ArgList & args)22int scanf_main(Reader *reader, const char *__restrict str, 23 internal::ArgList &args) { 24 Parser<internal::ArgList> parser(str, args); 25 int ret_val = READ_OK; 26 int conversions = 0; 27 for (FormatSection cur_section = parser.get_next_section(); 28 !cur_section.raw_string.empty() && ret_val == READ_OK; 29 cur_section = parser.get_next_section()) { 30 if (cur_section.has_conv) { 31 ret_val = convert(reader, cur_section); 32 // The %n (current position) conversion doesn't increment the number of 33 // assignments. 34 if (cur_section.conv_name != 'n') 35 conversions += ret_val == READ_OK ? 1 : 0; 36 } else { 37 ret_val = raw_match(reader, cur_section.raw_string); 38 } 39 } 40 41 return conversions; 42 } 43 44 } // namespace scanf_core 45 } // namespace LIBC_NAMESPACE 46