1c92911e9e
This patch applies the lint rules described in the previous patch. There was also a significant amount of effort put into manually fixing things, since all of the templated functions, or structs defined in /spec, were not updated and had to be handled manually. Reviewed By: sivachandra, lntue Differential Revision: https://reviews.llvm.org/D114302
132 lines
4.6 KiB
C++
132 lines
4.6 KiB
C++
//===-- Collection of utils for mktime and friends --------------*- 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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#ifndef LLVM_LIBC_SRC_TIME_TIME_UTILS_H
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#define LLVM_LIBC_SRC_TIME_TIME_UTILS_H
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#include <stddef.h> // For size_t.
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#include "include/errno.h"
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#include "src/errno/llvmlibc_errno.h"
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#include "src/time/mktime.h"
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#include <stdint.h>
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namespace __llvm_libc {
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namespace time_utils {
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struct TimeConstants {
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static constexpr int SECONDS_PER_MIN = 60;
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static constexpr int SECONDS_PER_HOUR = 3600;
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static constexpr int SECONDS_PER_DAY = 86400;
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static constexpr int DAYS_PER_WEEK = 7;
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static constexpr int MONTHS_PER_YEAR = 12;
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static constexpr int DAYS_PER_NON_LEAP_YEAR = 365;
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static constexpr int DAYS_PER_LEAP_YEAR = 366;
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static constexpr int TIME_YEAR_BASE = 1900;
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static constexpr int EPOCH_YEAR = 1970;
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static constexpr int EPOCH_WEEK_DAY = 4;
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static constexpr int NUMBER_OF_SECONDS_IN_LEAP_YEAR =
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(DAYS_PER_NON_LEAP_YEAR + 1) * SECONDS_PER_DAY;
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// For asctime the behavior is undefined if struct tm's tm_wday or tm_mon are
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// not within the normal ranges as defined in <time.h>, or if struct tm's
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// tm_year exceeds {INT_MAX}-1990, or if the below asctime_internal algorithm
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// would attempt to generate more than 26 bytes of output (including the
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// terminating null).
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static constexpr int ASCTIME_BUFFER_SIZE = 256;
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static constexpr int ASCTIME_MAX_BYTES = 26;
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/* 2000-03-01 (mod 400 year, immediately after feb29 */
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static constexpr int64_t SECONDS_UNTIL2000_MARCH_FIRST =
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(946684800LL + SECONDS_PER_DAY * (31 + 29));
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static constexpr int WEEK_DAY_OF2000_MARCH_FIRST = 3;
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static constexpr int DAYS_PER400_YEARS =
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(DAYS_PER_NON_LEAP_YEAR * 400 + (400 / 4) - 3);
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static constexpr int DAYS_PER100_YEARS =
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(DAYS_PER_NON_LEAP_YEAR * 100 + (100 / 4) - 1);
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static constexpr int DAYS_PER4_YEARS = (DAYS_PER_NON_LEAP_YEAR * 4 + 1);
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// The latest time that can be represented in this form is 03:14:07 UTC on
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// Tuesday, 19 January 2038 (corresponding to 2,147,483,647 seconds since the
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// start of the epoch). This means that systems using a 32-bit time_t type are
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// susceptible to the Year 2038 problem.
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static constexpr int END_OF32_BIT_EPOCH_YEAR = 2038;
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static constexpr time_t OUT_OF_RANGE_RETURN_VALUE = -1;
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};
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// Update the "tm" structure's year, month, etc. members from seconds.
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// "total_seconds" is the number of seconds since January 1st, 1970.
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extern int64_t update_from_seconds(int64_t total_seconds, struct tm *tm);
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// POSIX.1-2017 requires this.
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static inline time_t out_of_range() {
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llvmlibc_errno = EOVERFLOW;
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return static_cast<time_t>(-1);
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}
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static inline void invalid_value() { llvmlibc_errno = EINVAL; }
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static inline char *asctime(const struct tm *timeptr, char *buffer,
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size_t bufferLength) {
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if (timeptr == nullptr || buffer == nullptr) {
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invalid_value();
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return nullptr;
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}
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if (timeptr->tm_wday < 0 ||
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timeptr->tm_wday > (TimeConstants::DAYS_PER_WEEK - 1)) {
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invalid_value();
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return nullptr;
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}
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if (timeptr->tm_mon < 0 ||
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timeptr->tm_mon > (TimeConstants::MONTHS_PER_YEAR - 1)) {
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invalid_value();
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return nullptr;
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}
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// TODO(rtenneti): i18n the following strings.
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static const char *week_days_name[TimeConstants::DAYS_PER_WEEK] = {
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"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
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static const char *months_name[TimeConstants::MONTHS_PER_YEAR] = {
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
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int written_size = __builtin_snprintf(
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buffer, bufferLength, "%.3s %.3s%3d %.2d:%.2d:%.2d %d\n",
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week_days_name[timeptr->tm_wday], months_name[timeptr->tm_mon],
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timeptr->tm_mday, timeptr->tm_hour, timeptr->tm_min, timeptr->tm_sec,
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TimeConstants::TIME_YEAR_BASE + timeptr->tm_year);
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if (written_size < 0)
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return nullptr;
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if (static_cast<size_t>(written_size) >= bufferLength) {
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out_of_range();
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return nullptr;
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}
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return buffer;
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}
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static inline struct tm *gmtime_internal(const time_t *timer,
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struct tm *result) {
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int64_t seconds = *timer;
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// Update the tm structure's year, month, day, etc. from seconds.
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if (update_from_seconds(seconds, result) < 0) {
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out_of_range();
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return nullptr;
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}
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return result;
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}
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} // namespace time_utils
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} // namespace __llvm_libc
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#endif // LLVM_LIBC_SRC_TIME_TIME_UTILS_H
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