88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "lang_id/common/lite_strings/numbers.h"
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#include <ctype.h>
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#include <stdlib.h>
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#include <climits>
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namespace libtextclassifier3 {
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namespace mobile {
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// Returns true if the characters that start at address ptr (inclusive) and stop
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// at the first '\0' consist of only whitespaces, as determined by isspace().
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// Note: this function returns false if ptr is nullptr.
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static bool OnlyWhitespaces(const char *ptr) {
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if (ptr == nullptr) {
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return false;
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}
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for (; *ptr != '\0'; ++ptr) {
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if (!isspace(*ptr)) {
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return false;
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}
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}
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return true;
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}
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bool LiteAtoi(const char *c_str, int *value) {
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if (c_str == nullptr) {
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return false;
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}
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// Short version of man strtol:
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//
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// strtol parses some optional whitespaces, an optional +/- sign, and next a
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// succession of digits. If it finds some digits, it sets temp to point to
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// the first character after that succession of digits and returns the parsed
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// integer.
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//
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// If there were no digits at all, strtol() sets temp to be c_str (the start
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// address) and returns 0.
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char *temp = nullptr;
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const long int parsed_value = strtol(c_str, &temp, 0); // NOLINT
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// Check for overflow. Note: to simplify the code, we assume that LONG_MIN /
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// LONG_MAX means that strtol encountered an overflow (normally, in that case,
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// one should also inspect errno). Hence, we maybe give up the possibility to
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// parse one extreme value on each side (min/max). That should be ok.
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if ((parsed_value == LONG_MIN) || (parsed_value == LONG_MAX) ||
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(parsed_value < INT_MIN) || (parsed_value > INT_MAX)) {
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return false;
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}
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*value = static_cast<int>(parsed_value);
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// First part of the expression below means that the input string contained at
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// least one digit. The other part checks that what remains after the number
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// (if anything) consists only of whitespaces.
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return (temp != c_str) && OnlyWhitespaces(temp);
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}
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bool LiteAtof(const char *c_str, float *value) {
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if (c_str == nullptr) {
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return false;
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}
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// strtof is similar to strtol, see more detailed comments inside LiteAtoi.
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char *temp = nullptr;
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*value = strtof(c_str, &temp);
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return (temp != c_str) && OnlyWhitespaces(temp);
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}
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} // namespace mobile
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} // namespace nlp_saft
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