1 /*
2 * Copyright 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #pragma once
18 #include <string>
19
20 static const std::string kFormatChars = std::string("duoxXfFeEgGaAcsp");
21 static constexpr int32_t kMaxFormatFlagValue = INT16_MAX;
22 enum FormatChar : uint8_t {
23 SIGNED_DECIMAL = 0,
24 UNSIGNED_DECIMAL = 1,
25 UNSIGNED_OCTAL = 2,
26 UNSIGNED_HEX_LOWER = 3,
27 UNSIGNED_HEX_UPPER = 4,
28 // Uppercase/lowercase floating point impacts 'inf', 'infinity', and 'nan'
29 FLOAT_LOWER = 5,
30 FLOAT_UPPER = 6,
31 // Upper/lower impacts the "e" in exponents.
32 EXPONENT_LOWER = 7,
33 EXPONENT_UPPER = 8,
34 // %g will use %e or %f, whichever is shortest
35 SHORT_EXP_LOWER = 9,
36 // %G will use %E or %F, whichever is shortest
37 SHORT_EXP_UPPER = 10,
38 HEX_FLOAT_LOWER = 11,
39 HEX_FLOAT_UPPER = 12,
40 CHAR = 13,
41 STRING = 14,
42 POINTER = 15,
43 // Used by libfuzzer
44 kMaxValue = POINTER
45 };
46
canApplyFlag(FormatChar formatChar,char modifier)47 bool canApplyFlag(FormatChar formatChar, char modifier) {
48 if (modifier == '#') {
49 return formatChar == UNSIGNED_OCTAL || formatChar == UNSIGNED_HEX_LOWER ||
50 formatChar == UNSIGNED_HEX_UPPER || formatChar == FLOAT_LOWER ||
51 formatChar == FLOAT_UPPER || formatChar == SHORT_EXP_LOWER ||
52 formatChar == SHORT_EXP_UPPER;
53 } else if (modifier == '.') {
54 return formatChar == SIGNED_DECIMAL || formatChar == UNSIGNED_DECIMAL ||
55 formatChar == UNSIGNED_OCTAL || formatChar == UNSIGNED_HEX_LOWER ||
56 formatChar == UNSIGNED_HEX_UPPER || formatChar == FLOAT_LOWER ||
57 formatChar == FLOAT_UPPER || formatChar == SHORT_EXP_LOWER ||
58 formatChar == SHORT_EXP_UPPER || formatChar == STRING;
59 }
60 return true;
61 }
62