/* * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * Redistribution and use in source and binary forms are permitted * provided that the above copyright notice and this paragraph are * duplicated in all such forms and that any documentation, * advertising materials, and other materials related to such * distribution and use acknowledge that the software was developed * by the University of California, Berkeley. The name of the * University may not be used to endorse or promote products derived * from this software without specific prior written permission. * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ #ifndef lint #ifndef NOID static const char elsieid[] = "@(#)strftime.3 8.3"; /* ** Based on the UCB version with the ID appearing below. ** This is ANSIish only when "multibyte character == plain character". */ #endif /* !defined NOID */ #endif /* !defined lint */ #include "namespace.h" #include "private.h" #if defined(LIBC_SCCS) && !defined(lint) static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; #endif /* LIBC_SCCS and not lint */ #include __FBSDID("$FreeBSD$"); #include "tzfile.h" #include #include #include "un-namespace.h" #include "timelocal.h" static char * _add(const char *, char *, const char *); static char * _conv(int, const char *, char *, const char *); static char * _fmt(const char *, const struct tm *, char *, const char *, int *); static char * _yconv(int, int, int, int, char *, const char *); extern char * tzname[]; #ifndef YEAR_2000_NAME #define YEAR_2000_NAME "CHECK_STRFTIME_FORMATS_FOR_TWO_DIGIT_YEARS" #endif /* !defined YEAR_2000_NAME */ #define IN_NONE 0 #define IN_SOME 1 #define IN_THIS 2 #define IN_ALL 3 #define PAD_DEFAULT 0 #define PAD_LESS 1 #define PAD_SPACE 2 #define PAD_ZERO 3 static const char* fmt_padding[][4] = { /* DEFAULT, LESS, SPACE, ZERO */ #define PAD_FMT_MONTHDAY 0 #define PAD_FMT_HMS 0 #define PAD_FMT_CENTURY 0 #define PAD_FMT_SHORTYEAR 0 #define PAD_FMT_MONTH 0 #define PAD_FMT_WEEKOFYEAR 0 #define PAD_FMT_DAYOFMONTH 0 { "%02d", "%d", "%2d", "%02d" }, #define PAD_FMT_SDAYOFMONTH 1 #define PAD_FMT_SHMS 1 { "%2d", "%d", "%2d", "%02d" }, #define PAD_FMT_DAYOFYEAR 2 { "%03d", "%d", "%3d", "%03d" }, #define PAD_FMT_YEAR 3 { "%04d", "%d", "%4d", "%04d" } }; size_t strftime(char * __restrict s, size_t maxsize, const char * __restrict format, const struct tm * __restrict t) { char * p; int warn; tzset(); warn = IN_NONE; p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn); #ifndef NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU if (warn != IN_NONE && getenv(YEAR_2000_NAME) != NULL) { (void) fprintf(stderr, "\n"); if (format == NULL) (void) fprintf(stderr, "NULL strftime format "); else (void) fprintf(stderr, "strftime format \"%s\" ", format); (void) fprintf(stderr, "yields only two digits of years in "); if (warn == IN_SOME) (void) fprintf(stderr, "some locales"); else if (warn == IN_THIS) (void) fprintf(stderr, "the current locale"); else (void) fprintf(stderr, "all locales"); (void) fprintf(stderr, "\n"); } #endif /* !defined NO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU */ if (p == s + maxsize) return 0; *p = '\0'; return p - s; } static char * _fmt(format, t, pt, ptlim, warnp) const char * format; const struct tm * const t; char * pt; const char * const ptlim; int * warnp; { int Ealternative, Oalternative, PadIndex; struct lc_time_T *tptr = __get_current_time_locale(); for ( ; *format; ++format) { if (*format == '%') { Ealternative = 0; Oalternative = 0; PadIndex = PAD_DEFAULT; label: switch (*++format) { case '\0': --format; break; case 'A': pt = _add((t->tm_wday < 0 || t->tm_wday >= DAYSPERWEEK) ? "?" : tptr->weekday[t->tm_wday], pt, ptlim); continue; case 'a': pt = _add((t->tm_wday < 0 || t->tm_wday >= DAYSPERWEEK) ? "?" : tptr->wday[t->tm_wday], pt, ptlim); continue; case 'B': pt = _add((t->tm_mon < 0 || t->tm_mon >= MONSPERYEAR) ? "?" : (Oalternative ? tptr->alt_month : tptr->month)[t->tm_mon], pt, ptlim); continue; case 'b': case 'h': pt = _add((t->tm_mon < 0 || t->tm_mon >= MONSPERYEAR) ? "?" : tptr->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(tptr->c_fmt, t, pt, ptlim, &warn2); if (warn2 == IN_ALL) warn2 = IN_THIS; if (warn2 > *warnp) *warnp = warn2; } continue; case 'D': pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp); continue; case 'd': pt = _conv(t->tm_mday, fmt_padding[PAD_FMT_DAYOFMONTH][PadIndex], pt, ptlim); continue; case 'E': if (Ealternative || Oalternative) break; Ealternative++; goto label; 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. ** ** FreeBSD extension ** %OB */ if (Ealternative || Oalternative) break; Oalternative++; goto label; case 'e': pt = _conv(t->tm_mday, fmt_padding[PAD_FMT_SDAYOFMONTH][PadIndex], pt, ptlim); continue; case 'F': pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp); continue; case 'H': pt = _conv(t->tm_hour, fmt_padding[PAD_FMT_HMS][PadIndex], pt, ptlim); continue; case 'I': pt = _conv((t->tm_hour % 12) ? (t->tm_hour % 12) : 12, fmt_padding[PAD_FMT_HMS][PadIndex], pt, ptlim); continue; case 'j': pt = _conv(t->tm_yday + 1, fmt_padding[PAD_FMT_DAYOFYEAR][PadIndex], 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, fmt_padding[PAD_FMT_SHMS][PadIndex], pt, ptlim); continue; #ifdef KITCHEN_SINK case 'K': /* ** After all this time, still unclaimed! */ pt = _add("kitchen sink", pt, ptlim); continue; #endif /* defined KITCHEN_SINK */ 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, fmt_padding[PAD_FMT_SHMS][PadIndex], pt, ptlim); continue; case 'M': pt = _conv(t->tm_min, fmt_padding[PAD_FMT_HMS][PadIndex], pt, ptlim); continue; case 'm': pt = _conv(t->tm_mon + 1, fmt_padding[PAD_FMT_MONTH][PadIndex], pt, ptlim); continue; case 'n': pt = _add("\n", pt, ptlim); continue; case 'p': pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ? tptr->pm : tptr->am, pt, ptlim); continue; case 'R': pt = _fmt("%H:%M", t, pt, ptlim, warnp); continue; case 'r': pt = _fmt(tptr->ampm_fmt, t, pt, ptlim, warnp); continue; case 'S': pt = _conv(t->tm_sec, fmt_padding[PAD_FMT_HMS][PadIndex], pt, ptlim); continue; case 's': { struct tm tm; char buf[INT_STRLEN_MAXIMUM( time_t) + 1]; time_t mkt; tm = *t; mkt = mktime(&tm); if (TYPE_SIGNED(time_t)) (void) sprintf(buf, "%ld", (long) mkt); else (void) sprintf(buf, "%lu", (unsigned long) mkt); pt = _add(buf, pt, ptlim); } continue; case 'T': pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp); continue; case 't': pt = _add("\t", pt, ptlim); continue; case 'U': pt = _conv((t->tm_yday + DAYSPERWEEK - t->tm_wday) / DAYSPERWEEK, fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], 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, "%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; } #ifdef XPG4_1994_04_09 if ((w == 52 && t->tm_mon == TM_JANUARY) || (w == 1 && t->tm_mon == TM_DECEMBER)) w = 53; #endif /* defined XPG4_1994_04_09 */ if (*format == 'V') pt = _conv(w, fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], 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("%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, fmt_padding[PAD_FMT_WEEKOFYEAR][PadIndex], pt, ptlim); continue; case 'w': pt = _conv(t->tm_wday, "%d", pt, ptlim); continue; case 'X': pt = _fmt(tptr->X_fmt, t, pt, ptlim, warnp); continue; case 'x': { int warn2 = IN_SOME; pt = _fmt(tptr->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': #ifdef TM_ZONE if (t->TM_ZONE != NULL) pt = _add(t->TM_ZONE, pt, ptlim); else #endif /* defined TM_ZONE */ if (t->tm_isdst >= 0) pt = _add(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; char const * sign; if (t->tm_isdst < 0) continue; #ifdef TM_GMTOFF diff = t->TM_GMTOFF; #else /* !defined TM_GMTOFF */ /* ** C99 says that the UTC offset must ** be computed by looking only at ** tm_isdst. This requirement is ** incorrect, since it means the code ** must rely on magic (in this case ** altzone and timezone), and the ** magic might not have the correct ** offset. Doing things correctly is ** tricky and requires disobeying C99; ** see GNU C strftime for details. ** For now, punt and conform to the ** standard, even though it's incorrect. ** ** C99 says that %z must be replaced by the ** empty string if the time zone is not ** determinable, so output nothing if the ** appropriate variables are not available. */ if (t->tm_isdst == 0) #ifdef USG_COMPAT diff = -timezone; #else /* !defined USG_COMPAT */ continue; #endif /* !defined USG_COMPAT */ else #ifdef ALTZONE diff = -altzone; #else /* !defined ALTZONE */ continue; #endif /* !defined ALTZONE */ #endif /* !defined TM_GMTOFF */ if (diff < 0) { sign = "-"; diff = -diff; } else sign = "+"; pt = _add(sign, pt, ptlim); diff /= SECSPERMIN; diff = (diff / MINSPERHOUR) * 100 + (diff % MINSPERHOUR); pt = _conv(diff, fmt_padding[PAD_FMT_YEAR][PadIndex], pt, ptlim); } continue; case '+': pt = _fmt(tptr->date_fmt, t, pt, ptlim, warnp); continue; case '-': if (PadIndex != PAD_DEFAULT) break; PadIndex = PAD_LESS; goto label; case '_': if (PadIndex != PAD_DEFAULT) break; PadIndex = PAD_SPACE; goto label; case '0': if (PadIndex != PAD_DEFAULT) break; PadIndex = PAD_ZERO; goto label; case '%': /* ** X311J/88-090 (4.12.3.5): if conversion char is ** undefined, behavior is undefined. Print out the ** character itself as printf(3) also does. */ default: break; } } if (pt == ptlim) break; *pt++ = *format; } return pt; } static char * _conv(n, format, pt, ptlim) const int n; const char * const format; char * const pt; const char * const ptlim; { char buf[INT_STRLEN_MAXIMUM(int) + 1]; (void) sprintf(buf, format, n); return _add(buf, pt, ptlim); } static char * _add(str, pt, ptlim) const char * str; char * pt; const char * const ptlim; { while (pt < ptlim && (*pt = *str++) != '\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 char * _yconv(a, b, convert_top, convert_yy, pt, ptlim) const int a; const int b; const int convert_top; const int convert_yy; char * pt; const char * const ptlim; { register int lead; register 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("-0", pt, ptlim); else pt = _conv(lead, "%02d", pt, ptlim); } if (convert_yy) pt = _conv(((trail < 0) ? -trail : trail), "%02d", pt, ptlim); return pt; }