/* * 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.c 7.38"; /* ** 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 *); size_t strftime(char * __restrict, size_t, const char * __restrict, const struct tm * __restrict); extern char * tzname[]; size_t strftime(char * __restrict s, size_t maxsize, const char * __restrict format, const struct tm * __restrict t) { char *p; tzset(); p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize); if (p == s + maxsize) return 0; *p = '\0'; return p - s; } static char * _fmt(format, t, pt, ptlim) const char *format; const struct tm *const t; char *pt; const char *const ptlim; { int Ealternative, Oalternative; struct lc_time_T *tptr = __get_current_time_locale(); for ( ; *format; ++format) { if (*format == '%') { Ealternative = 0; Oalternative = 0; label: switch (*++format) { case '\0': --format; break; case 'A': pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? "?" : tptr->weekday[t->tm_wday], pt, ptlim); continue; case 'a': pt = _add((t->tm_wday < 0 || t->tm_wday > 6) ? "?" : tptr->wday[t->tm_wday], pt, ptlim); continue; case 'B': pt = _add((t->tm_mon < 0 || t->tm_mon > 11) ? "?" : (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 > 11) ? "?" : 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, 5/24/93) */ pt = _conv((t->tm_year + TM_YEAR_BASE) / 100, "%02d", pt, ptlim); continue; case 'c': pt = _fmt(tptr->c_fmt, t, pt, ptlim); continue; case 'D': pt = _fmt("%m/%d/%y", t, pt, ptlim); continue; case 'd': pt = _conv(t->tm_mday, "%02d", pt, ptlim); continue; case 'E': if (Ealternative || Oalternative) break; Ealternative++; goto label; case 'O': /* ** POSIX locale extensions, a la ** Arnold Robbins' strftime version 3.0. ** 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. ** (ado, 5/24/93) ** ** FreeBSD extensions ** %OB %Ef %EF */ if (Ealternative || Oalternative) break; Oalternative++; goto label; case 'e': pt = _conv(t->tm_mday, "%2d", pt, ptlim); continue; case 'F': pt = _fmt("%Y-%m-%d", t, pt, ptlim); continue; case 'H': pt = _conv(t->tm_hour, "%02d", pt, ptlim); continue; case 'I': pt = _conv((t->tm_hour % 12) ? (t->tm_hour % 12) : 12, "%02d", pt, ptlim); continue; case 'j': pt = _conv(t->tm_yday + 1, "%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, 5/24/93) */ pt = _conv(t->tm_hour, "%2d", 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, 5/24/93) */ pt = _conv((t->tm_hour % 12) ? (t->tm_hour % 12) : 12, "%2d", pt, ptlim); continue; case 'M': pt = _conv(t->tm_min, "%02d", pt, ptlim); continue; case 'm': pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim); continue; case 'n': pt = _add("\n", pt, ptlim); continue; case 'p': pt = _add((t->tm_hour >= 12) ? tptr->pm : tptr->am, pt, ptlim); continue; case 'R': pt = _fmt("%H:%M", t, pt, ptlim); continue; case 'r': pt = _fmt(tptr->ampm_fmt, t, pt, ptlim); continue; case 'S': pt = _conv(t->tm_sec, "%02d", 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); continue; case 't': pt = _add("\t", pt, ptlim); continue; case 'U': pt = _conv((t->tm_yday + 7 - t->tm_wday) / 7, "%02d", pt, ptlim); continue; case 'u': /* ** From Arnold Robbins' strftime version 3.0: ** "ISO 8601: Weekday as a decimal number ** [1 (Monday) - 7]" ** (ado, 5/24/93) */ pt = _conv((t->tm_wday == 0) ? 7 : 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 yday; int wday; int w; year = t->tm_year + TM_YEAR_BASE; yday = t->tm_yday; wday = t->tm_wday; for ( ; ; ) { int len; int bot; int top; len = isleap(year) ? 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) { ++year; w = 1; break; } if (yday >= bot) { w = 1 + ((yday - bot) / DAYSPERWEEK); break; } --year; yday += isleap(year) ? 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, "%02d", pt, ptlim); else if (*format == 'g') { pt = _conv(year % 100, "%02d", pt, ptlim); } else pt = _conv(year, "%04d", pt, ptlim); } continue; case 'v': /* ** From Arnold Robbins' strftime version 3.0: ** "date as dd-bbb-YYYY" ** (ado, 5/24/93) */ pt = _fmt("%e-%b-%Y", t, pt, ptlim); continue; case 'W': pt = _conv((t->tm_yday + 7 - (t->tm_wday ? (t->tm_wday - 1) : 6)) / 7, "%02d", pt, ptlim); continue; case 'w': pt = _conv(t->tm_wday, "%d", pt, ptlim); continue; case 'X': pt = _fmt(tptr->X_fmt, t, pt, ptlim); continue; case 'x': pt = _fmt(tptr->x_fmt, t, pt, ptlim); continue; case 'y': pt = _conv((t->tm_year + TM_YEAR_BASE) % 100, "%02d", pt, ptlim); continue; case 'Y': pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d", pt, ptlim); continue; case 'Z': if (t->tm_zone != NULL) pt = _add(t->tm_zone, pt, ptlim); else if (t->tm_isdst == 0 || t->tm_isdst == 1) { pt = _add(tzname[t->tm_isdst], pt, ptlim); } else pt = _add("?", pt, ptlim); continue; case 'z': { long absoff; if (t->tm_gmtoff >= 0) { absoff = t->tm_gmtoff; pt = _add("+", pt, ptlim); } else { absoff = -t->tm_gmtoff; pt = _add("-", pt, ptlim); } pt = _conv(absoff / 3600, "%02d", pt, ptlim); pt = _conv((absoff % 3600) / 60, "%02d", pt, ptlim); }; continue; case '+': pt = _fmt(tptr->date_fmt, t, pt, ptlim); continue; 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; }