I hereby relicense all my work on Sortix under the ISC license as below. All Sortix contributions by other people are already under this license, are not substantial enough to be copyrightable, or have been removed. All imported code from other projects is compatible with this license. All GPL licensed code from other projects had previously been removed. Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors. Permission to use, copy, modify, and distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
330 lines
10 KiB
C
330 lines
10 KiB
C
/*
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* Copyright (c) 2013, 2014 Jonas 'Sortie' Termansen.
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*
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* time/strftime.c
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* Format time and date into a string.
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*/
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#ifndef STRFTIME
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#define STRFTIME strftime
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#define STRFTIME_CHAR char
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#define STRFTIME_L(x) x
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#endif
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#include <sys/cdefs.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <time.h>
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#include <wchar.h>
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static const STRFTIME_CHAR* GetWeekdayAbbreviated(const struct tm* tm)
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{
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switch ( tm->tm_wday % 7 )
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{
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case 0: return STRFTIME_L("Sun");
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case 1: return STRFTIME_L("Mon");
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case 2: return STRFTIME_L("Tue");
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case 3: return STRFTIME_L("Wed");
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case 4: return STRFTIME_L("Thu");
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case 5: return STRFTIME_L("Fri");
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case 6: return STRFTIME_L("Sat");
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default: __builtin_unreachable();
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}
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}
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static const STRFTIME_CHAR* GetWeekday(const struct tm* tm)
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{
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switch ( tm->tm_wday % 7 )
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{
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case 0: return STRFTIME_L("Sunday");
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case 1: return STRFTIME_L("Monday");
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case 2: return STRFTIME_L("Tuesday");
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case 3: return STRFTIME_L("Wednesday");
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case 4: return STRFTIME_L("Thursday");
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case 5: return STRFTIME_L("Friday");
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case 6: return STRFTIME_L("Saturday");
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default: __builtin_unreachable();
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}
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}
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static const STRFTIME_CHAR* GetMonthAbbreviated(const struct tm* tm)
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{
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switch ( tm->tm_mon % 12 )
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{
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case 0: return STRFTIME_L("Jan");
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case 1: return STRFTIME_L("Feb");
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case 2: return STRFTIME_L("Mar");
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case 3: return STRFTIME_L("Apr");
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case 4: return STRFTIME_L("May");
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case 5: return STRFTIME_L("Jun");
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case 6: return STRFTIME_L("Jul");
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case 7: return STRFTIME_L("Aug");
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case 8: return STRFTIME_L("Sep");
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case 9: return STRFTIME_L("Oct");
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case 10: return STRFTIME_L("Nov");
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case 11: return STRFTIME_L("Dec");
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default: __builtin_unreachable();
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}
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}
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static const STRFTIME_CHAR* GetMonth(const struct tm* tm)
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{
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switch ( tm->tm_mon % 12 )
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{
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case 0: return STRFTIME_L("January");
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case 1: return STRFTIME_L("February");
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case 2: return STRFTIME_L("March");
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case 3: return STRFTIME_L("April");
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case 4: return STRFTIME_L("May");
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case 5: return STRFTIME_L("June");
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case 6: return STRFTIME_L("July");
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case 7: return STRFTIME_L("August");
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case 8: return STRFTIME_L("Sepember");
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case 9: return STRFTIME_L("October");
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case 10: return STRFTIME_L("November");
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case 11: return STRFTIME_L("December");
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default: __builtin_unreachable();
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}
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}
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static
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size_t strftime_convert_uintmax(STRFTIME_CHAR* destination, uintmax_t value)
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{
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size_t result = 1;
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uintmax_t copy = value;
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while ( 10 <= copy )
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copy /= 10, result++;
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for ( size_t i = result; i != 0; i-- )
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destination[i-1] = STRFTIME_L('0') + value % 10,
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value /= 10;
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destination[result] = STRFTIME_L('\0');
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return result;
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}
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static
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size_t strftime_convert_int(STRFTIME_CHAR* destination, int value)
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{
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if ( value < 0 )
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{
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*destination++ = STRFTIME_L('-');
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return 1 + strftime_convert_uintmax(destination, - (uintmax_t) (intmax_t) value);
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}
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return strftime_convert_uintmax(destination, (uintmax_t) value);
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}
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size_t STRFTIME(STRFTIME_CHAR* s,
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size_t max,
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const STRFTIME_CHAR* format,
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const struct tm* tm)
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{
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const STRFTIME_CHAR* orig_format = format;
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size_t ret = 0;
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#define OUTPUT_CHAR(expr) \
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do { \
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if ( ret == max ) \
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return errno = ERANGE, 0; \
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s[ret++] = (expr); \
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} while ( 0 )
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#define OUTPUT_STRING(expr) \
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do { \
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const STRFTIME_CHAR* out_str = (expr); \
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while ( *out_str ) \
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OUTPUT_CHAR(*out_str++); \
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} while ( 0 )
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#define OUTPUT_STRFTIME(expr) \
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do { \
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int old_errno = errno; \
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errno = 0; \
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size_t subret = STRFTIME(s + ret, max - ret, (expr), tm); \
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if ( !subret && errno ) \
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return 0; \
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errno = old_errno; \
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ret += subret; \
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} while ( 0 )
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#define OUTPUT_INT_PADDED(valexpr, widthexpr, padexpr) \
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do { \
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int val = (valexpr); \
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size_t width = (widthexpr); \
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STRFTIME_CHAR pad = (padexpr); \
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STRFTIME_CHAR str[sizeof(int) * 3]; \
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str[0] = STRFTIME_L('\0'); \
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size_t got = strftime_convert_int(str, val); \
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while ( pad && got < width-- ) \
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OUTPUT_CHAR(pad); \
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OUTPUT_STRING(str); \
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} while ( 0 )
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#define OUTPUT_INT(valexpr) OUTPUT_INT_PADDED(valexpr, 0, STRFTIME_L('\0'))
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#if defined(STRFTIME_IS_WCHAR)
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#define OUTPUT_UNSUPPORTED() \
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do { \
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fprintf(stderr, "%s:%u: %s: error: unsupported format string \"%ls\" around \"%%%ls\"\n", \
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__FILE__, __LINE__, __STRINGIFY(STRFTIME), orig_format, specifiers_begun_at); \
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return 0; \
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} while ( 0 )
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#else
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#define OUTPUT_UNSUPPORTED() \
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do { \
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fprintf(stderr, "%s:%u: %s: error: unsupported format string \"%s\" around \"%%%s\"\n", \
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__FILE__, __LINE__, __STRINGIFY(STRFTIME), orig_format, specifiers_begun_at); \
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return 0; \
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} while ( 0 )
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#endif
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#define OUTPUT_UNDEFINED() OUTPUT_UNSUPPORTED()
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STRFTIME_CHAR c;
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while ( (c = *format++) )
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{
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if ( c != STRFTIME_L('%') )
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{
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OUTPUT_CHAR(c);
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continue;
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}
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const STRFTIME_CHAR* specifiers_begun_at = format;
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c = *format++;
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// Process any optional flags.
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STRFTIME_CHAR padding_char = STRFTIME_L(' ');
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bool plus_padding = false;
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while ( true )
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{
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switch ( c )
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{
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case STRFTIME_L('0'): padding_char = STRFTIME_L('0'); break;
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case STRFTIME_L('+'): padding_char = STRFTIME_L('0'); plus_padding = true; break;
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default: goto end_of_flags;
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}
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c = *format++;
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}
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end_of_flags:
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// TODO: Support the '+' flag!
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if ( plus_padding )
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OUTPUT_UNSUPPORTED();
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// Process the optional minimum field width.
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size_t field_width = 0;
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while ( STRFTIME_L('0') <= c && c <= STRFTIME_L('9') )
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field_width = field_width * 10 + c - STRFTIME_L('0'),
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c = *format++;
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// Process an optional E or O modifier.
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bool e_modifier = false;
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bool o_modifier = false;
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if ( c == STRFTIME_L('E') )
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e_modifier = true,
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c = *format++;
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else if ( c == STRFTIME_L('O') )
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o_modifier = true,
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c = *format++;
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// TODO: Support the E and O modifiers where marked with the E and O
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// comments in the below switch.
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if ( e_modifier || o_modifier ) { }
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switch ( c )
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{
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case STRFTIME_L('a'): OUTPUT_STRING(GetWeekdayAbbreviated(tm)); break;
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case STRFTIME_L('A'): OUTPUT_STRING(GetWeekday(tm)); break;
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case STRFTIME_L('b'): OUTPUT_STRING(GetMonthAbbreviated(tm)); break;
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case STRFTIME_L('B'): OUTPUT_STRING(GetMonth(tm)); break;
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case STRFTIME_L('c'): /*E*/
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OUTPUT_STRING(GetWeekday(tm));
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OUTPUT_STRING(STRFTIME_L(" "));
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OUTPUT_STRING(GetMonthAbbreviated(tm));
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OUTPUT_STRING(STRFTIME_L(" "));
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OUTPUT_INT_PADDED(tm->tm_mday, 2, STRFTIME_L('0'));
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OUTPUT_STRING(STRFTIME_L(" "));
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OUTPUT_INT_PADDED(tm->tm_hour, 2, STRFTIME_L('0'));
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OUTPUT_STRING(STRFTIME_L(":"));
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OUTPUT_INT_PADDED(tm->tm_min, 2, STRFTIME_L('0'));
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OUTPUT_STRING(STRFTIME_L(":"));
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OUTPUT_INT_PADDED(tm->tm_sec, 2, STRFTIME_L('0'));
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break;
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case STRFTIME_L('C'): /*E*/
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if ( !field_width )
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field_width = 2;
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OUTPUT_INT_PADDED((tm->tm_year + 1900) / 100, field_width, padding_char);
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break;
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case STRFTIME_L('d'): OUTPUT_INT_PADDED(tm->tm_mday, 2, STRFTIME_L('0')); break; /*O*/
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case STRFTIME_L('D'): OUTPUT_STRFTIME(STRFTIME_L("%m/%d/%y")); break;
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case STRFTIME_L('e'): OUTPUT_INT_PADDED(tm->tm_mday, 2, STRFTIME_L(' ')); break; /*O*/
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case STRFTIME_L('F'):
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// TODO: Revisit this.
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OUTPUT_UNSUPPORTED();
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break;
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case STRFTIME_L('g'):
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// TODO: These require a bit of intelligence.
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OUTPUT_UNSUPPORTED();
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break;
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case STRFTIME_L('G'):
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// TODO: These require a bit of intelligence.
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OUTPUT_UNSUPPORTED();
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break;
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case STRFTIME_L('h'): OUTPUT_STRFTIME(STRFTIME_L("%b")); break;
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case STRFTIME_L('H'): OUTPUT_INT_PADDED(tm->tm_hour, 2, STRFTIME_L('0')); break; /*O*/
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case STRFTIME_L('I'): OUTPUT_INT_PADDED(tm->tm_hour % 12 + 1, 2, STRFTIME_L('0')); break; /*O*/
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case STRFTIME_L('j'): OUTPUT_INT_PADDED(tm->tm_yday + 1, 3, STRFTIME_L('0')); break;
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case STRFTIME_L('m'): OUTPUT_INT_PADDED(tm->tm_mon + 1, 2, STRFTIME_L('0')); break; /*O*/
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case STRFTIME_L('M'): OUTPUT_INT_PADDED(tm->tm_min, 2, STRFTIME_L('0')); break; /*O*/
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case STRFTIME_L('n'): OUTPUT_CHAR(STRFTIME_L('\n')); break;
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case STRFTIME_L('p'): OUTPUT_STRING(tm->tm_hour < 12 ? STRFTIME_L("AM") : STRFTIME_L("PM")); break;
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case STRFTIME_L('r'): OUTPUT_STRFTIME(STRFTIME_L("%I:%M:%S %p")); break;
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case STRFTIME_L('R'): OUTPUT_STRFTIME(STRFTIME_L("%H:%M")); break;
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case STRFTIME_L('S'): OUTPUT_INT_PADDED(tm->tm_sec, 2, STRFTIME_L('0')); break; /*O*/
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case STRFTIME_L('t'): OUTPUT_CHAR(STRFTIME_L('\t')); break;
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case STRFTIME_L('T'): OUTPUT_STRFTIME(STRFTIME_L("%H:%M:%S")); break;
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case STRFTIME_L('u'): OUTPUT_INT(tm->tm_yday); break; /*O*/
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case STRFTIME_L('U'): /*O*/
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// TODO: These require a bit of intelligence.
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OUTPUT_UNSUPPORTED();
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break;
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case STRFTIME_L('V'): /*O*/
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// TODO: These require a bit of intelligence.
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OUTPUT_UNSUPPORTED();
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break;
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case STRFTIME_L('w'): OUTPUT_INT(tm->tm_wday); break; /*O*/
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case STRFTIME_L('W'): /*O*/
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// TODO: These require a bit of intelligence.
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OUTPUT_UNSUPPORTED();
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break;
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case STRFTIME_L('x'): OUTPUT_STRFTIME(STRFTIME_L("%m/%d/%y")); break; /*E*/
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case STRFTIME_L('X'): OUTPUT_STRFTIME(STRFTIME_L("%H:%M:%S")); break; /*E*/
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case STRFTIME_L('y'): OUTPUT_INT_PADDED((tm->tm_year + 1900) % 100, 2, STRFTIME_L('0')); break; /*EO*/
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case STRFTIME_L('Y'): OUTPUT_INT(tm->tm_year + 1900); break; /*E*/
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case STRFTIME_L('z'):
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// TODO: struct tm doesn't have all this information available!
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break;
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case STRFTIME_L('Z'):
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// TODO: struct tm doesn't have all this information available!
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break;
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case STRFTIME_L('%'): OUTPUT_CHAR(STRFTIME_L('%')); break;
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default: OUTPUT_UNDEFINED(); break;
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}
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}
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if ( ret == max )
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return errno = ERANGE, 0;
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return s[ret] = STRFTIME_L('\0'), ret;
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}
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