forked from OSchip/llvm-project
99 lines
2.8 KiB
C++
99 lines
2.8 KiB
C++
//===-- Format specifier converter implmentation for scanf -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "src/stdio/scanf_core/converter.h"
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#include "src/__support/ctype_utils.h"
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#include "src/stdio/scanf_core/core_structs.h"
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#include "src/stdio/scanf_core/reader.h"
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#include "src/stdio/scanf_core/string_converter.h"
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#include <stddef.h>
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namespace __llvm_libc {
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namespace scanf_core {
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int convert(Reader *reader, const FormatSection &to_conv) {
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int ret_val = 0;
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switch (to_conv.conv_name) {
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case '%':
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return raw_match(reader, "%");
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case 's':
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ret_val = raw_match(reader, " ");
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if (ret_val != READ_OK)
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return ret_val;
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return convert_string(reader, to_conv);
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case 'c':
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case '[':
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return convert_string(reader, to_conv);
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// case 'd':
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// case 'i':
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// case 'u':
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// case 'o':
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// case 'x':
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// case 'X':
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// ret_val = raw_match(reader, " ");
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// if (ret_val != READ_OK)
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// return ret_val;
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// return convert_int(reader, to_conv);
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// #ifndef LLVM_LIBC_SCANF_DISABLE_FLOAT
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// case 'f':
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// case 'F':
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// case 'e':
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// case 'E':
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// case 'a':
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// case 'A':
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// case 'g':
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// case 'G':
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// ret_val = raw_match(reader, " ");
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// if (ret_val != READ_OK)
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// return ret_val;
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// return convert_float(reader, to_conv);
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// #endif // LLVM_LIBC_SCANF_DISABLE_FLOAT
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// #ifndef LLVM_LIBC_SCANF_DISABLE_WRITE_INT
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// case 'n':
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// return convert_write_int(reader, to_conv);
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// #endif // LLVM_LIBC_SCANF_DISABLE_WRITE_INT
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// case 'p':
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// ret_val = raw_match(reader, " ");
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// if (ret_val != READ_OK)
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// return ret_val;
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// return convert_pointer(reader, to_conv);
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default:
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return raw_match(reader, to_conv.raw_string);
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}
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return -1;
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}
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// raw_string is assumed to have a positive size.
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int raw_match(Reader *reader, cpp::string_view raw_string) {
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char cur_char = reader->getc();
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int ret_val = READ_OK;
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for (size_t i = 0; i < raw_string.size(); ++i) {
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// Any space character matches any number of space characters.
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if (internal::isspace(raw_string[i])) {
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while (internal::isspace(cur_char)) {
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cur_char = reader->getc();
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}
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} else {
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if (raw_string[i] == cur_char) {
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cur_char = reader->getc();
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} else {
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ret_val = MATCHING_FAILURE;
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break;
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}
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}
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}
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reader->ungetc(cur_char);
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return ret_val;
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}
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} // namespace scanf_core
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} // namespace __llvm_libc
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