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1//===-- Composite converter for strftime ------------------------*- C++ -*-===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See htto_conv.times://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef LLVM_LIBC_SRC_STDIO_STRFTIME_CORE_COMPOSITE_CONVERTER_H10#define LLVM_LIBC_SRC_STDIO_STRFTIME_CORE_COMPOSITE_CONVERTER_H11 12#include "hdr/types/struct_tm.h"13#include "src/__support/CPP/string_view.h"14#include "src/__support/macros/config.h"15#include "src/stdio/printf_core/writer.h"16#include "src/time/strftime_core/core_structs.h"17#include "src/time/strftime_core/num_converter.h"18#include "src/time/strftime_core/str_converter.h"19#include "src/time/time_constants.h"20#include "src/time/time_utils.h"21 22namespace LIBC_NAMESPACE_DECL {23namespace strftime_core {24 25LIBC_INLINE IntFormatSection26get_specific_int_format(const tm *timeptr, const FormatSection &base_to_conv,27 char new_conv_name, int TRAILING_CONV_LEN = -1) {28 // a negative padding will be treated as the default29 const int NEW_MIN_WIDTH =30 TRAILING_CONV_LEN > 0 ? base_to_conv.min_width - TRAILING_CONV_LEN : 0;31 FormatSection new_conv = base_to_conv;32 new_conv.conv_name = new_conv_name;33 new_conv.min_width = NEW_MIN_WIDTH;34 35 IntFormatSection result = get_int_format(new_conv, timeptr);36 37 // If the user set the padding, but it's below the width of the trailing38 // conversions, then there should be no padding.39 if (base_to_conv.min_width > 0 && NEW_MIN_WIDTH < 0)40 result.pad_to_len = 0;41 42 return result;43}44 45template <printf_core::WriteMode write_mode>46LIBC_INLINE int convert_date_us(printf_core::Writer<write_mode> *writer,47 const FormatSection &to_conv,48 const tm *timeptr) {49 // format is %m/%d/%y (month/day/year)50 // we only pad the first conversion, and we assume all the other values are in51 // their valid ranges.52 constexpr int TRAILING_CONV_LEN = 1 + 2 + 1 + 2; // sizeof("/01/02")53 IntFormatSection year_conv;54 IntFormatSection mon_conv;55 IntFormatSection mday_conv;56 57 mon_conv = get_specific_int_format(timeptr, to_conv, 'm', TRAILING_CONV_LEN);58 mday_conv = get_specific_int_format(timeptr, to_conv, 'd');59 year_conv = get_specific_int_format(timeptr, to_conv, 'y');60 61 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, mon_conv));62 RET_IF_RESULT_NEGATIVE(writer->write('/'));63 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, mday_conv));64 RET_IF_RESULT_NEGATIVE(writer->write('/'));65 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, year_conv));66 67 return WRITE_OK;68}69 70template <printf_core::WriteMode write_mode>71LIBC_INLINE int convert_date_iso(printf_core::Writer<write_mode> *writer,72 const FormatSection &to_conv,73 const tm *timeptr) {74 // format is "%Y-%m-%d" (year-month-day)75 // we only pad the first conversion, and we assume all the other values are in76 // their valid ranges.77 constexpr int TRAILING_CONV_LEN = 1 + 2 + 1 + 2; // sizeof("-01-02")78 IntFormatSection year_conv;79 IntFormatSection mon_conv;80 IntFormatSection mday_conv;81 82 year_conv = get_specific_int_format(timeptr, to_conv, 'Y', TRAILING_CONV_LEN);83 mon_conv = get_specific_int_format(timeptr, to_conv, 'm');84 mday_conv = get_specific_int_format(timeptr, to_conv, 'd');85 86 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, year_conv));87 RET_IF_RESULT_NEGATIVE(writer->write('-'));88 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, mon_conv));89 RET_IF_RESULT_NEGATIVE(writer->write('-'));90 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, mday_conv));91 92 return WRITE_OK;93}94 95template <printf_core::WriteMode write_mode>96LIBC_INLINE int convert_time_am_pm(printf_core::Writer<write_mode> *writer,97 const FormatSection &to_conv,98 const tm *timeptr) {99 // format is "%I:%M:%S %p" (hour:minute:second AM/PM)100 // we only pad the first conversion, and we assume all the other values are in101 // their valid ranges.102 constexpr int TRAILING_CONV_LEN =103 1 + 2 + 1 + 2 + 1 + 2; // sizeof(":01:02 AM")104 IntFormatSection hour_conv;105 IntFormatSection min_conv;106 IntFormatSection sec_conv;107 108 const time_utils::TMReader time_reader(timeptr);109 110 hour_conv = get_specific_int_format(timeptr, to_conv, 'I', TRAILING_CONV_LEN);111 min_conv = get_specific_int_format(timeptr, to_conv, 'M');112 sec_conv = get_specific_int_format(timeptr, to_conv, 'S');113 114 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, hour_conv));115 RET_IF_RESULT_NEGATIVE(writer->write(':'));116 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, min_conv));117 RET_IF_RESULT_NEGATIVE(writer->write(':'));118 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, sec_conv));119 RET_IF_RESULT_NEGATIVE(writer->write(' '));120 RET_IF_RESULT_NEGATIVE(writer->write(time_reader.get_am_pm()));121 122 return WRITE_OK;123}124 125template <printf_core::WriteMode write_mode>126LIBC_INLINE int convert_time_minute(printf_core::Writer<write_mode> *writer,127 const FormatSection &to_conv,128 const tm *timeptr) {129 // format is "%H:%M" (hour:minute)130 // we only pad the first conversion, and we assume all the other values are in131 // their valid ranges.132 constexpr int TRAILING_CONV_LEN = 1 + 2; // sizeof(":01")133 IntFormatSection hour_conv;134 IntFormatSection min_conv;135 136 hour_conv = get_specific_int_format(timeptr, to_conv, 'H', TRAILING_CONV_LEN);137 min_conv = get_specific_int_format(timeptr, to_conv, 'M');138 139 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, hour_conv));140 RET_IF_RESULT_NEGATIVE(writer->write(':'));141 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, min_conv));142 143 return WRITE_OK;144}145 146template <printf_core::WriteMode write_mode>147LIBC_INLINE int convert_time_second(printf_core::Writer<write_mode> *writer,148 const FormatSection &to_conv,149 const tm *timeptr) {150 // format is "%H:%M:%S" (hour:minute:second)151 // we only pad the first conversion, and we assume all the other values are in152 // their valid ranges.153 constexpr int TRAILING_CONV_LEN = 1 + 2 + 1 + 2; // sizeof(":01:02")154 IntFormatSection hour_conv;155 IntFormatSection min_conv;156 IntFormatSection sec_conv;157 158 hour_conv = get_specific_int_format(timeptr, to_conv, 'H', TRAILING_CONV_LEN);159 min_conv = get_specific_int_format(timeptr, to_conv, 'M');160 sec_conv = get_specific_int_format(timeptr, to_conv, 'S');161 162 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, hour_conv));163 RET_IF_RESULT_NEGATIVE(writer->write(':'));164 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, min_conv));165 RET_IF_RESULT_NEGATIVE(writer->write(':'));166 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, sec_conv));167 168 return WRITE_OK;169}170 171template <printf_core::WriteMode write_mode>172LIBC_INLINE int convert_full_date_time(printf_core::Writer<write_mode> *writer,173 const FormatSection &to_conv,174 const tm *timeptr) {175 const time_utils::TMReader time_reader(timeptr);176 // format is "%a %b %e %T %Y" (weekday month mday [time] year)177 // we only pad the first conversion, and we assume all the other values are in178 // their valid ranges.179 // sizeof("Sun Jan 12 03:45:06 2025")180 constexpr int FULL_CONV_LEN = 3 + 1 + 3 + 1 + 2 + 1 + 8 + 1 + 4;181 // use the full conv len because this isn't being passed to a proper converter182 // that will handle the width of the leading conversion. Instead it has to be183 // handled below.184 const int requested_padding = to_conv.min_width - FULL_CONV_LEN;185 186 cpp::string_view wday_str = unwrap_opt(time_reader.get_weekday_short_name());187 cpp::string_view month_str = unwrap_opt(time_reader.get_month_short_name());188 IntFormatSection mday_conv;189 IntFormatSection year_conv;190 191 mday_conv = get_specific_int_format(timeptr, to_conv, 'e');192 year_conv = get_specific_int_format(timeptr, to_conv, 'Y');193 194 FormatSection raw_time_conv = to_conv;195 raw_time_conv.conv_name = 'T';196 raw_time_conv.min_width = 0;197 198 if (requested_padding > 0)199 RET_IF_RESULT_NEGATIVE(writer->write(' ', requested_padding));200 RET_IF_RESULT_NEGATIVE(writer->write(wday_str));201 RET_IF_RESULT_NEGATIVE(writer->write(' '));202 RET_IF_RESULT_NEGATIVE(writer->write(month_str));203 RET_IF_RESULT_NEGATIVE(writer->write(' '));204 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, mday_conv));205 RET_IF_RESULT_NEGATIVE(writer->write(' '));206 RET_IF_RESULT_NEGATIVE(convert_time_second(writer, raw_time_conv, timeptr));207 RET_IF_RESULT_NEGATIVE(writer->write(' '));208 RET_IF_RESULT_NEGATIVE(write_padded_int(writer, year_conv));209 210 return WRITE_OK;211}212 213template <printf_core::WriteMode write_mode>214LIBC_INLINE int convert_composite(printf_core::Writer<write_mode> *writer,215 const FormatSection &to_conv,216 const tm *timeptr) {217 switch (to_conv.conv_name) {218 case 'c': // locale specified date and time219 // in default locale Equivalent to %a %b %e %T %Y.220 return convert_full_date_time(writer, to_conv, timeptr);221 case 'D': // %m/%d/%y (month/day/year)222 return convert_date_us(writer, to_conv, timeptr);223 case 'F': // %Y-%m-%d (year-month-day)224 return convert_date_iso(writer, to_conv, timeptr);225 case 'r': // %I:%M:%S %p (hour:minute:second AM/PM)226 return convert_time_am_pm(writer, to_conv, timeptr);227 case 'R': // %H:%M (hour:minute)228 return convert_time_minute(writer, to_conv, timeptr);229 case 'T': // %H:%M:%S (hour:minute:second)230 return convert_time_second(writer, to_conv, timeptr);231 case 'x': // locale specified date232 // in default locale Equivalent to %m/%d/%y. (same as %D)233 return convert_date_us(writer, to_conv, timeptr);234 case 'X': // locale specified time235 // in default locale Equivalent to %T.236 return convert_time_second(writer, to_conv, timeptr);237 default:238 __builtin_trap(); // this should be unreachable, but trap if you hit it.239 }240}241} // namespace strftime_core242} // namespace LIBC_NAMESPACE_DECL243 244#endif // LLVM_LIBC_SRC_STDIO_STRFTIME_CORE_COMPOSITE_CONVERTER_H245