1 /*
2 * Copyright (C) 2018 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 #include "utils/strings/numbers.h"
18
19 #ifdef COMPILER_MSVC
20 #include <sstream>
21 #endif // COMPILER_MSVC
22
23 #include <stdlib.h>
24
25 namespace libtextclassifier3 {
26
ParseInt32(const char * c_str,int32 * value)27 bool ParseInt32(const char *c_str, int32 *value) {
28 char *temp;
29
30 // Short version of man strtol:
31 //
32 // strtol parses some optional whitespaces, an optional +/- sign, and next a
33 // succession of digits. If it finds some digits, it sets temp to point to
34 // the first character after that succession of digits and returns the parsed
35 // integer.
36 //
37 // If there were no digits at all, strtol() sets temp to be c_str (the start
38 // address) and returns 0.
39 *value = strtol(c_str, &temp, 0); // NOLINT
40
41 // temp != c_str means that the input string contained at least one digit (see
42 // above). *temp == '\0' means the input string does not contain any random
43 // chars after the number.
44 return (temp != c_str) && (*temp == '\0');
45 }
46
ParseInt64(const char * c_str,int64 * value)47 bool ParseInt64(const char *c_str, int64 *value) {
48 char *temp;
49 *value = strtoll(c_str, &temp, 0); // NOLINT
50
51 // See comments inside ParseInt32.
52 return (temp != c_str) && (*temp == '\0');
53 }
54
ParseDouble(const char * c_str,double * value)55 bool ParseDouble(const char *c_str, double *value) {
56 char *temp;
57 *value = strtod(c_str, &temp);
58
59 // See comments inside ParseInt32.
60 return (temp != c_str) && (*temp == '\0');
61 }
62
63 #ifdef COMPILER_MSVC
IntToString(int64 input)64 std::string IntToString(int64 input) {
65 std::stringstream stream;
66 stream << input;
67 return stream.str();
68 }
69 #else
IntToString(int64 input)70 std::string IntToString(int64 input) {
71 return std::to_string(input);
72 }
73 #endif // COMPILER_MSVC
74
75 } // namespace libtextclassifier3
76