| /* $OpenBSD: wcsftime.c,v 1.6 2015/02/09 14:52:28 tedu Exp $ */ |
| /* |
| ** Based on the UCB version with the ID appearing below. |
| ** This is ANSIish only when "multibyte character == plain character". |
| ** |
| ** Copyright (c) 1989, 1993 |
| ** The Regents of the University of California. All rights reserved. |
| ** |
| ** Redistribution and use in source and binary forms, with or without |
| ** modification, are permitted provided that the following conditions |
| ** are met: |
| ** 1. Redistributions of source code must retain the above copyright |
| ** notice, this list of conditions and the following disclaimer. |
| ** 2. Redistributions in binary form must reproduce the above copyright |
| ** notice, this list of conditions and the following disclaimer in the |
| ** documentation and/or other materials provided with the distribution. |
| ** 3. Neither the name of the University nor the names of its contributors |
| ** may be used to endorse or promote products derived from this software |
| ** without specific prior written permission. |
| ** |
| ** THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| ** ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| ** SUCH DAMAGE. |
| */ |
| |
| #include <fcntl.h> |
| #include <locale.h> |
| #include <wchar.h> |
| |
| #include "private.h" |
| #include "tzfile.h" |
| |
| struct lc_time_T { |
| const wchar_t * mon[MONSPERYEAR]; |
| const wchar_t * month[MONSPERYEAR]; |
| const wchar_t * wday[DAYSPERWEEK]; |
| const wchar_t * weekday[DAYSPERWEEK]; |
| const wchar_t * X_fmt; |
| const wchar_t * x_fmt; |
| const wchar_t * c_fmt; |
| const wchar_t * am; |
| const wchar_t * pm; |
| const wchar_t * date_fmt; |
| }; |
| |
| #define Locale (&C_time_locale) |
| |
| static const struct lc_time_T C_time_locale = { |
| { |
| L"Jan", L"Feb", L"Mar", L"Apr", L"May", L"Jun", |
| L"Jul", L"Aug", L"Sep", L"Oct", L"Nov", L"Dec" |
| }, { |
| L"January", L"February", L"March", L"April", L"May", L"June", |
| L"July", L"August", L"September", L"October", L"November", |
| L"December" |
| }, { |
| L"Sun", L"Mon", L"Tue", L"Wed", |
| L"Thu", L"Fri", L"Sat" |
| }, { |
| L"Sunday", L"Monday", L"Tuesday", L"Wednesday", |
| L"Thursday", L"Friday", L"Saturday" |
| }, |
| |
| /* X_fmt */ |
| L"%H:%M:%S", |
| |
| /* |
| ** x_fmt |
| ** C99 requires this format. |
| ** Using just numbers (as here) makes Quakers happier; |
| ** it's also compatible with SVR4. |
| */ |
| L"%m/%d/%y", |
| |
| /* |
| ** c_fmt |
| ** C99 requires this format. |
| ** Previously this code used "%D %X", but we now conform to C99. |
| ** Note that |
| ** "%a %b %d %H:%M:%S %Y" |
| ** is used by Solaris 2.3. |
| */ |
| L"%a %b %e %T %Y", |
| |
| /* am */ |
| L"AM", |
| |
| /* pm */ |
| L"PM", |
| |
| /* date_fmt */ |
| L"%a %b %e %H:%M:%S %Z %Y" |
| }; |
| |
| #define UNKNOWN L"?" |
| static wchar_t * _add(const wchar_t *, wchar_t *, const wchar_t *); |
| static wchar_t * _sadd(const char *, wchar_t *, const wchar_t *); |
| static wchar_t * _conv(int, const wchar_t *, wchar_t *, const wchar_t *); |
| static wchar_t * _fmt(const wchar_t *, const struct tm *, wchar_t *, const wchar_t *, |
| int *); |
| static wchar_t * _yconv(int, int, int, int, wchar_t *, const wchar_t *); |
| |
| extern char * tzname[]; |
| |
| #define IN_NONE 0 |
| #define IN_SOME 1 |
| #define IN_THIS 2 |
| #define IN_ALL 3 |
| |
| size_t |
| wcsftime(wchar_t *__restrict s, size_t maxsize, |
| const wchar_t *__restrict format, const struct tm *__restrict t) |
| { |
| wchar_t *p; |
| int warn; |
| |
| tzset(); |
| warn = IN_NONE; |
| p = _fmt(((format == NULL) ? L"%c" : format), t, s, s + maxsize, &warn); |
| if (p == s + maxsize) { |
| if (maxsize > 0) |
| s[maxsize - 1] = '\0'; |
| return 0; |
| } |
| *p = L'\0'; |
| return p - s; |
| } |
| |
| static wchar_t * |
| _fmt(const wchar_t *format, const struct tm *t, wchar_t *pt, |
| const wchar_t *ptlim, int *warnp) |
| { |
| for ( ; *format; ++format) { |
| if (*format != L'%') { |
| if (pt == ptlim) |
| break; |
| *pt++ = *format; |
| continue; |
| } |
| label: |
| switch (*++format) { |
| case '\0': |
| --format; |
| break; |
| case 'A': |
| pt = _add((t->tm_wday < 0 || |
| t->tm_wday >= DAYSPERWEEK) ? |
| UNKNOWN : Locale->weekday[t->tm_wday], |
| pt, ptlim); |
| continue; |
| case 'a': |
| pt = _add((t->tm_wday < 0 || |
| t->tm_wday >= DAYSPERWEEK) ? |
| UNKNOWN : Locale->wday[t->tm_wday], |
| pt, ptlim); |
| continue; |
| case 'B': |
| pt = _add((t->tm_mon < 0 || |
| t->tm_mon >= MONSPERYEAR) ? |
| UNKNOWN : Locale->month[t->tm_mon], |
| pt, ptlim); |
| continue; |
| case 'b': |
| case 'h': |
| pt = _add((t->tm_mon < 0 || |
| t->tm_mon >= MONSPERYEAR) ? |
| UNKNOWN : Locale->mon[t->tm_mon], |
| pt, ptlim); |
| continue; |
| case 'C': |
| /* |
| ** %C used to do a... |
| ** _fmt("%a %b %e %X %Y", t); |
| ** ...whereas now POSIX 1003.2 calls for |
| ** something completely different. |
| ** (ado, 1993-05-24) |
| */ |
| pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 0, |
| pt, ptlim); |
| continue; |
| case 'c': |
| { |
| int warn2 = IN_SOME; |
| |
| pt = _fmt(Locale->c_fmt, t, pt, ptlim, &warn2); |
| if (warn2 == IN_ALL) |
| warn2 = IN_THIS; |
| if (warn2 > *warnp) |
| *warnp = warn2; |
| } |
| continue; |
| case 'D': |
| pt = _fmt(L"%m/%d/%y", t, pt, ptlim, warnp); |
| continue; |
| case 'd': |
| pt = _conv(t->tm_mday, L"%02d", pt, ptlim); |
| continue; |
| case 'E': |
| case 'O': |
| /* |
| ** C99 locale modifiers. |
| ** The sequences |
| ** %Ec %EC %Ex %EX %Ey %EY |
| ** %Od %oe %OH %OI %Om %OM |
| ** %OS %Ou %OU %OV %Ow %OW %Oy |
| ** are supposed to provide alternate |
| ** representations. |
| */ |
| goto label; |
| case 'e': |
| pt = _conv(t->tm_mday, L"%2d", pt, ptlim); |
| continue; |
| case 'F': |
| pt = _fmt(L"%Y-%m-%d", t, pt, ptlim, warnp); |
| continue; |
| case 'H': |
| pt = _conv(t->tm_hour, L"%02d", pt, ptlim); |
| continue; |
| case 'I': |
| pt = _conv((t->tm_hour % 12) ? |
| (t->tm_hour % 12) : 12, |
| L"%02d", pt, ptlim); |
| continue; |
| case 'j': |
| pt = _conv(t->tm_yday + 1, L"%03d", pt, ptlim); |
| continue; |
| case 'k': |
| /* |
| ** This used to be... |
| ** _conv(t->tm_hour % 12 ? |
| ** t->tm_hour % 12 : 12, 2, ' '); |
| ** ...and has been changed to the below to |
| ** match SunOS 4.1.1 and Arnold Robbins' |
| ** strftime version 3.0. That is, "%k" and |
| ** "%l" have been swapped. |
| ** (ado, 1993-05-24) |
| */ |
| pt = _conv(t->tm_hour, L"%2d", pt, ptlim); |
| continue; |
| case 'l': |
| /* |
| ** This used to be... |
| ** _conv(t->tm_hour, 2, ' '); |
| ** ...and has been changed to the below to |
| ** match SunOS 4.1.1 and Arnold Robbin's |
| ** strftime version 3.0. That is, "%k" and |
| ** "%l" have been swapped. |
| ** (ado, 1993-05-24) |
| */ |
| pt = _conv((t->tm_hour % 12) ? |
| (t->tm_hour % 12) : 12, |
| L"%2d", pt, ptlim); |
| continue; |
| case 'M': |
| pt = _conv(t->tm_min, L"%02d", pt, ptlim); |
| continue; |
| case 'm': |
| pt = _conv(t->tm_mon + 1, L"%02d", pt, ptlim); |
| continue; |
| case 'n': |
| pt = _add(L"\n", pt, ptlim); |
| continue; |
| case 'p': |
| pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? |
| Locale->pm : |
| Locale->am, |
| pt, ptlim); |
| continue; |
| case 'R': |
| pt = _fmt(L"%H:%M", t, pt, ptlim, warnp); |
| continue; |
| case 'r': |
| pt = _fmt(L"%I:%M:%S %p", t, pt, ptlim, warnp); |
| continue; |
| case 'S': |
| pt = _conv(t->tm_sec, L"%02d", pt, ptlim); |
| continue; |
| case 's': |
| { |
| struct tm tm; |
| wchar_t buf[INT_STRLEN_MAXIMUM( |
| time_t) + 1]; |
| time_t mkt; |
| |
| tm = *t; |
| mkt = mktime(&tm); |
| (void) swprintf(buf, |
| sizeof buf/sizeof buf[0], |
| L"%ld", (long) mkt); |
| pt = _add(buf, pt, ptlim); |
| } |
| continue; |
| case 'T': |
| pt = _fmt(L"%H:%M:%S", t, pt, ptlim, warnp); |
| continue; |
| case 't': |
| pt = _add(L"\t", pt, ptlim); |
| continue; |
| case 'U': |
| pt = _conv((t->tm_yday + DAYSPERWEEK - |
| t->tm_wday) / DAYSPERWEEK, |
| L"%02d", pt, ptlim); |
| continue; |
| case 'u': |
| /* |
| ** From Arnold Robbins' strftime version 3.0: |
| ** "ISO 8601: Weekday as a decimal number |
| ** [1 (Monday) - 7]" |
| ** (ado, 1993-05-24) |
| */ |
| pt = _conv((t->tm_wday == 0) ? |
| DAYSPERWEEK : t->tm_wday, |
| L"%d", pt, ptlim); |
| continue; |
| case 'V': /* ISO 8601 week number */ |
| case 'G': /* ISO 8601 year (four digits) */ |
| case 'g': /* ISO 8601 year (two digits) */ |
| /* |
| ** From Arnold Robbins' strftime version 3.0: "the week number of the |
| ** year (the first Monday as the first day of week 1) as a decimal number |
| ** (01-53)." |
| ** (ado, 1993-05-24) |
| ** |
| ** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn: |
| ** "Week 01 of a year is per definition the first week which has the |
| ** Thursday in this year, which is equivalent to the week which contains |
| ** the fourth day of January. In other words, the first week of a new year |
| ** is the week which has the majority of its days in the new year. Week 01 |
| ** might also contain days from the previous year and the week before week |
| ** 01 of a year is the last week (52 or 53) of the previous year even if |
| ** it contains days from the new year. A week starts with Monday (day 1) |
| ** and ends with Sunday (day 7). For example, the first week of the year |
| ** 1997 lasts from 1996-12-30 to 1997-01-05..." |
| ** (ado, 1996-01-02) |
| */ |
| { |
| int year; |
| int base; |
| int yday; |
| int wday; |
| int w; |
| |
| year = t->tm_year; |
| base = TM_YEAR_BASE; |
| yday = t->tm_yday; |
| wday = t->tm_wday; |
| for ( ; ; ) { |
| int len; |
| int bot; |
| int top; |
| |
| len = isleap_sum(year, base) ? |
| DAYSPERLYEAR : |
| DAYSPERNYEAR; |
| /* |
| ** What yday (-3 ... 3) does the ISO year |
| ** begin on? |
| */ |
| bot = ((yday + 11 - wday) % DAYSPERWEEK) - 3; |
| /* |
| ** What yday does the NEXT ISO year begin on? |
| */ |
| top = bot - (len % DAYSPERWEEK); |
| if (top < -3) |
| top += DAYSPERWEEK; |
| top += len; |
| if (yday >= top) { |
| ++base; |
| w = 1; |
| break; |
| } |
| if (yday >= bot) { |
| w = 1 + ((yday - bot) / DAYSPERWEEK); |
| break; |
| } |
| --base; |
| yday += isleap_sum(year, base) ? |
| DAYSPERLYEAR : |
| DAYSPERNYEAR; |
| } |
| if ((w == 52 && t->tm_mon == TM_JANUARY) || |
| (w == 1 && t->tm_mon == TM_DECEMBER)) |
| w = 53; |
| if (*format == 'V') |
| pt = _conv(w, L"%02d", pt, ptlim); |
| else if (*format == 'g') { |
| *warnp = IN_ALL; |
| pt = _yconv(year, base, 0, 1, pt, ptlim); |
| } else |
| pt = _yconv(year, base, 1, 1, pt, ptlim); |
| } |
| continue; |
| case 'v': |
| /* |
| ** From Arnold Robbins' strftime version 3.0: |
| ** "date as dd-bbb-YYYY" |
| ** (ado, 1993-05-24) |
| */ |
| pt = _fmt(L"%e-%b-%Y", t, pt, ptlim, warnp); |
| continue; |
| case 'W': |
| pt = _conv((t->tm_yday + DAYSPERWEEK - |
| (t->tm_wday ? |
| (t->tm_wday - 1) : |
| (DAYSPERWEEK - 1))) / DAYSPERWEEK, |
| L"%02d", pt, ptlim); |
| continue; |
| case 'w': |
| pt = _conv(t->tm_wday, L"%d", pt, ptlim); |
| continue; |
| case 'X': |
| pt = _fmt(Locale->X_fmt, t, pt, ptlim, warnp); |
| continue; |
| case 'x': |
| { |
| int warn2 = IN_SOME; |
| |
| pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2); |
| if (warn2 == IN_ALL) |
| warn2 = IN_THIS; |
| if (warn2 > *warnp) |
| *warnp = warn2; |
| } |
| continue; |
| case 'y': |
| *warnp = IN_ALL; |
| pt = _yconv(t->tm_year, TM_YEAR_BASE, 0, 1, pt, ptlim); |
| continue; |
| case 'Y': |
| pt = _yconv(t->tm_year, TM_YEAR_BASE, 1, 1, pt, ptlim); |
| continue; |
| case 'Z': |
| if (t->tm_zone != NULL) |
| pt = _sadd(t->TM_ZONE, pt, ptlim); |
| else |
| if (t->tm_isdst >= 0) |
| pt = _sadd(tzname[t->tm_isdst != 0], |
| pt, ptlim); |
| /* |
| ** C99 says that %Z must be replaced by the |
| ** empty string if the time zone is not |
| ** determinable. |
| */ |
| continue; |
| case 'z': |
| { |
| int diff; |
| wchar_t const * sign; |
| |
| if (t->tm_isdst < 0) |
| continue; |
| diff = t->tm_gmtoff; |
| if (diff < 0) { |
| sign = L"-"; |
| diff = -diff; |
| } else |
| sign = L"+"; |
| pt = _add(sign, pt, ptlim); |
| diff /= SECSPERMIN; |
| diff = (diff / MINSPERHOUR) * 100 + |
| (diff % MINSPERHOUR); |
| pt = _conv(diff, L"%04d", pt, ptlim); |
| } |
| continue; |
| case '+': |
| pt = _fmt(Locale->date_fmt, t, pt, ptlim, warnp); |
| continue; |
| case '%': |
| /* |
| ** X311J/88-090 (4.12.3.5): if conversion wchar_t is |
| ** undefined, behavior is undefined. Print out the |
| ** character itself as printf(3) also does. |
| */ |
| default: |
| if (pt != ptlim) |
| *pt++ = *format; |
| break; |
| } |
| } |
| return pt; |
| } |
| |
| static wchar_t * |
| _conv(int n, const wchar_t *format, wchar_t *pt, const wchar_t *ptlim) |
| { |
| wchar_t buf[INT_STRLEN_MAXIMUM(int) + 1]; |
| |
| (void) swprintf(buf, sizeof buf/sizeof buf[0], format, n); |
| return _add(buf, pt, ptlim); |
| } |
| |
| static wchar_t * |
| _add(const wchar_t *str, wchar_t *pt, const wchar_t *ptlim) |
| { |
| while (pt < ptlim && (*pt = *str++) != L'\0') |
| ++pt; |
| return pt; |
| } |
| |
| static wchar_t * |
| _sadd(const char *str, wchar_t *pt, const wchar_t *ptlim) |
| { |
| while (pt < ptlim && (*pt = btowc(*str++)) != L'\0') |
| ++pt; |
| return pt; |
| } |
| /* |
| ** POSIX and the C Standard are unclear or inconsistent about |
| ** what %C and %y do if the year is negative or exceeds 9999. |
| ** Use the convention that %C concatenated with %y yields the |
| ** same output as %Y, and that %Y contains at least 4 bytes, |
| ** with more only if necessary. |
| */ |
| |
| static wchar_t * |
| _yconv(int a, int b, int convert_top, int convert_yy, wchar_t *pt, |
| const wchar_t *ptlim) |
| { |
| int lead; |
| int trail; |
| |
| #define DIVISOR 100 |
| trail = a % DIVISOR + b % DIVISOR; |
| lead = a / DIVISOR + b / DIVISOR + trail / DIVISOR; |
| trail %= DIVISOR; |
| if (trail < 0 && lead > 0) { |
| trail += DIVISOR; |
| --lead; |
| } else if (lead < 0 && trail > 0) { |
| trail -= DIVISOR; |
| ++lead; |
| } |
| if (convert_top) { |
| if (lead == 0 && trail < 0) |
| pt = _add(L"-0", pt, ptlim); |
| else pt = _conv(lead, L"%02d", pt, ptlim); |
| } |
| if (convert_yy) |
| pt = _conv(((trail < 0) ? -trail : trail), L"%02d", pt, ptlim); |
| return pt; |
| } |
| |