/* $NetBSD: strftime.c,v 1.22 2012/03/20 16:39:08 matt Exp $ */ #include #if defined(LIBC_SCCS) && !defined(lint) #if 0 static char elsieid[] = "@(#)strftime.c 7.64"; static char elsieid[] = "@(#)strftime.c 8.3"; #else __RCSID("$NetBSD: strftime.c,v 1.22 2012/03/20 16:39:08 matt Exp $"); #endif #endif /* LIBC_SCCS and not lint */ #include "namespace.h" /* ** Based on the UCB version with the ID appearing below. ** This is ANSIish only when "multibyte character == plain character". */ #include "private.h" /* ** We don't use these extensions in strftime operation even when ** supported by the local tzcode configuration. A strictly ** conforming C application may leave them in undefined state. */ #ifdef _LIBC #undef TM_ZONE #undef TM_GMTOFF #endif /* ** 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. All advertising materials mentioning features or use of this software ** must display the following acknowledgement: ** This product includes software developed by the University of ** California, Berkeley and its contributors. ** 4. 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. */ #ifndef LIBC_SCCS #ifndef lint static const char sccsid[] = "@(#)strftime.c 5.4 (Berkeley) 3/14/89"; #endif /* !defined lint */ #endif /* !defined LIBC_SCCS */ #include "tzfile.h" #include "fcntl.h" #include "locale.h" #ifdef __weak_alias __weak_alias(strftime_z, _strftime_z) #endif #include "sys/localedef.h" #define Locale _CurrentTimeLocale #define c_fmt d_t_fmt static char * _add(const char *, char *, const char *); static char * _conv(int, const char *, char *, const char *); static char * _fmt(const timezone_t, 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 size_t strftime_z(const timezone_t sp, char * const s, const size_t maxsize, const char * const format, const struct tm * const t) { char * p; int warn; warn = IN_NONE; p = _fmt(sp, ((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(const timezone_t sp, const char *format, const struct tm * const t, char *pt, const char *const ptlim, int *warnp) { for ( ; *format; ++format) { if (*format == '%') { label: switch (*++format) { case '\0': --format; break; case 'A': pt = _add((t->tm_wday < 0 || t->tm_wday >= DAYSPERWEEK) ? "?" : Locale->day[t->tm_wday], pt, ptlim); continue; case 'a': pt = _add((t->tm_wday < 0 || t->tm_wday >= DAYSPERWEEK) ? "?" : Locale->abday[t->tm_wday], pt, ptlim); continue; case 'B': pt = _add((t->tm_mon < 0 || t->tm_mon >= MONSPERYEAR) ? "?" : Locale->mon[t->tm_mon], pt, ptlim); continue; case 'b': case 'h': pt = _add((t->tm_mon < 0 || t->tm_mon >= MONSPERYEAR) ? "?" : Locale->abmon[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(sp, Locale->c_fmt, t, pt, ptlim, &warn2); if (warn2 == IN_ALL) warn2 = IN_THIS; if (warn2 > *warnp) *warnp = warn2; } continue; case 'D': pt = _fmt(sp, "%m/%d/%y", t, pt, ptlim, warnp); continue; case 'd': pt = _conv(t->tm_mday, "%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, "%2d", pt, ptlim); continue; case 'F': pt = _fmt(sp, "%Y-%m-%d", t, pt, ptlim, warnp); 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, 1993-05-24) */ 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, 1993-05-24) */ 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 >= (HOURSPERDAY / 2)) ? Locale->am_pm[1] : Locale->am_pm[0], pt, ptlim); continue; case 'R': pt = _fmt(sp, "%H:%M", t, pt, ptlim, warnp); continue; case 'r': pt = _fmt(sp, Locale->t_fmt_ampm, t, pt, ptlim, warnp); 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); /* CONSTCOND */ if (TYPE_SIGNED(time_t)) (void) snprintf(buf, sizeof(buf), "%lld", (long long) mkt); else (void) snprintf(buf, sizeof(buf), "%llu", (unsigned long long) mkt); pt = _add(buf, pt, ptlim); } continue; case 'T': pt = _fmt(sp, "%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, "%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, "%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, "%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(sp, "%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, "%02d", pt, ptlim); continue; case 'w': pt = _conv(t->tm_wday, "%d", pt, ptlim); continue; case 'X': pt = _fmt(sp, Locale->t_fmt, t, pt, ptlim, warnp); continue; case 'x': { int warn2 = IN_SOME; pt = _fmt(sp, Locale->d_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((sp ? tzgetname(sp, t->tm_isdst) : 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 = (int)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. */ #ifndef STD_INSPIRED 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 */ #else /* defined STD_INSPIRED */ { struct tm tmp; time_t lct, gct; /* ** Get calendar time from t ** being treated as local. */ tmp = *t; /* mktime discards const */ lct = mktime(&tmp); if (lct == (time_t)-1) continue; /* ** Get calendar time from t ** being treated as GMT. **/ tmp = *t; /* mktime discards const */ gct = timegm(&tmp); if (gct == (time_t)-1) continue; /* LINTED difference will fit int */ diff = (intmax_t)gct - (intmax_t)lct; } #endif /* defined STD_INSPIRED */ #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, "%04d", pt, ptlim); } continue; #ifdef __minix case '+': pt = _fmt(sp, Locale->c_fmt, t, pt, ptlim, warnp); continue; #endif /* !__minix */ #if 0 case '+': pt = _fmt(sp, Locale->date_fmt, t, pt, ptlim, warnp); continue; #endif 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; } size_t strftime(char * const s, const size_t maxsize, const char * const format, const struct tm * const t) { tzset(); return strftime_z(NULL, s, maxsize, format, t); } static char * _conv(const int n, const char * const format, char * const pt, const char * const ptlim) { char buf[INT_STRLEN_MAXIMUM(int) + 1]; (void) snprintf(buf, sizeof(buf), format, n); return _add(buf, pt, ptlim); } static char * _add(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(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; } #ifdef LOCALE_HOME static struct lc_time_T * _loc(void) { static const char locale_home[] = LOCALE_HOME; static const char lc_time[] = "LC_TIME"; static char * locale_buf; int fd; int oldsun; /* "...ain't got nothin' to do..." */ char * lbuf; char * name; char * p; const char ** ap; const char * plim; char filename[FILENAME_MAX]; struct stat st; size_t namesize; size_t bufsize; /* ** Use localebuf.mon[0] to signal whether locale is already set up. */ if (localebuf.mon[0]) return &localebuf; name = setlocale(LC_TIME, (char *) NULL); if (name == NULL || *name == '\0') goto no_locale; /* ** If the locale name is the same as our cache, use the cache. */ lbuf = locale_buf; if (lbuf != NULL && strcmp(name, lbuf) == 0) { p = lbuf; for (ap = (const char **) &localebuf; ap < (const char **) (&localebuf + 1); ++ap) *ap = p += strlen(p) + 1; return &localebuf; } /* ** Slurp the locale file into the cache. */ namesize = strlen(name) + 1; if (sizeof filename < ((sizeof locale_home) + namesize + (sizeof lc_time))) goto no_locale; oldsun = 0; (void) sprintf(filename, "%s/%s/%s", locale_home, name, lc_time); fd = open(filename, O_RDONLY); if (fd < 0) { /* ** Old Sun systems have a different naming and data convention. */ oldsun = 1; (void) sprintf(filename, "%s/%s/%s", locale_home, lc_time, name); fd = open(filename, O_RDONLY); if (fd < 0) goto no_locale; } if (fstat(fd, &st) != 0) goto bad_locale; if (st.st_size <= 0) goto bad_locale; bufsize = namesize + st.st_size; locale_buf = NULL; lbuf = (lbuf == NULL) ? malloc(bufsize) : realloc(lbuf, bufsize); if (lbuf == NULL) goto bad_locale; (void) strcpy(lbuf, name); p = lbuf + namesize; plim = p + st.st_size; if (read(fd, p, (size_t) st.st_size) != st.st_size) goto bad_lbuf; if (close(fd) != 0) goto bad_lbuf; /* ** Parse the locale file into localebuf. */ if (plim[-1] != '\n') goto bad_lbuf; for (ap = (const char **) &localebuf; ap < (const char **) (&localebuf + 1); ++ap) { if (p == plim) goto bad_lbuf; *ap = p; while (*p != '\n') ++p; *p++ = '\0'; } if (oldsun) { /* ** SunOS 4 used an obsolescent format; see localdtconv(3). ** c_fmt had the ``short format for dates and times together'' ** (SunOS 4 date, "%a %b %e %T %Z %Y" in the C locale); ** date_fmt had the ``long format for dates'' ** (SunOS 4 strftime %C, "%A, %B %e, %Y" in the C locale). ** Discard the latter in favor of the former. */ localebuf.date_fmt = localebuf.c_fmt; } /* ** Record the successful parse in the cache. */ locale_buf = lbuf; return &localebuf; bad_lbuf: free(lbuf); bad_locale: (void) close(fd); no_locale: localebuf = C_time_locale; locale_buf = NULL; return &localebuf; } #endif /* defined LOCALE_HOME */