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