/* * Copyright 2013 Garrett D'Amore * Copyright 2010 Nexenta Systems, Inc. All rights reserved. * 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. */ #include "lint.h" #include "tzfile.h" #include #include #include #include #include #include #include "timelocal.h" #include "localeimpl.h" static char *_add(const char *, char *, const char *); static char *_conv(int, const char *, char *, const char *); static char *_fmt(locale_t, const char *, const struct tm *, char *, const char * const); static char *_yconv(int, int, int, int, char *, const char *); extern char *tzname[]; #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" } }; /* * If a caller (such as ascftime) passes in a very large maximum size, * the pointer addition here may overflow, wrap around the end of * memory, and, if used as-is, would cause subsequent range checks to fail * spuriously, resulting in corrupted output even if there is sufficent * room in the buffer for the requested format. * * To prevent this, we replace an overflowed result with the largest * possible pointer value. */ static char * _ptlim(char *s, size_t maxsize) { char *e = s + maxsize; if (e < s) e = (char *)(-sizeof (*e)); return (e); } size_t strftime_l(char *_RESTRICT_KYWD s, size_t maxsize, const char *_RESTRICT_KYWD format, const struct tm *_RESTRICT_KYWD t, locale_t loc) { char *p; char *e = _ptlim(s, maxsize); tzset(); p = _fmt(loc, ((format == NULL) ? "%c" : format), t, s, e); if (p == e) return (0); *p = '\0'; return (p - s); } size_t strftime(char *_RESTRICT_KYWD s, size_t maxsize, const char *_RESTRICT_KYWD format, const struct tm *_RESTRICT_KYWD t) { return (strftime_l(s, maxsize, format, t, uselocale(NULL))); } static char * _fmt(locale_t loc, const char *format, const struct tm *t, char *pt, const char * const ptlim) { int Ealternative, Oalternative, PadIndex; const struct lc_time *tptr = loc->time; #define PADDING(x) fmt_padding[x][PadIndex] 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) ? "?" : (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': pt = _fmt(loc, tptr->c_fmt, t, pt, ptlim); continue; case 'D': pt = _fmt(loc, "%m/%d/%y", t, pt, ptlim); continue; case 'd': pt = _conv(t->tm_mday, PADDING(PAD_FMT_DAYOFMONTH), 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. */ if (Ealternative || Oalternative) break; Oalternative++; goto label; case 'e': pt = _conv(t->tm_mday, PADDING(PAD_FMT_SDAYOFMONTH), pt, ptlim); continue; case 'F': pt = _fmt(loc, "%Y-%m-%d", t, pt, ptlim); continue; case 'H': pt = _conv(t->tm_hour, PADDING(PAD_FMT_HMS), pt, ptlim); continue; case 'I': pt = _conv((t->tm_hour % 12) ? (t->tm_hour % 12) : 12, PADDING(PAD_FMT_HMS), pt, ptlim); continue; case 'j': pt = _conv(t->tm_yday + 1, PADDING(PAD_FMT_DAYOFYEAR), 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, PADDING(PAD_FMT_SHMS), 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, PADDING(PAD_FMT_SHMS), pt, ptlim); continue; case 'M': pt = _conv(t->tm_min, PADDING(PAD_FMT_HMS), pt, ptlim); continue; case 'm': pt = _conv(t->tm_mon + 1, PADDING(PAD_FMT_MONTH), 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(loc, "%H:%M", t, pt, ptlim); continue; case 'r': pt = _fmt(loc, tptr->ampm_fmt, t, pt, ptlim); continue; case 'S': pt = _conv(t->tm_sec, PADDING(PAD_FMT_HMS), pt, ptlim); continue; case 's': { struct tm tm; char *buf; tm = *t; (void) asprintf(&buf, "%ld", mktime(&tm)); pt = _add(buf, pt, ptlim); continue; } case 'T': pt = _fmt(loc, "%H:%M:%S", t, pt, ptlim); continue; case 't': pt = _add("\t", pt, ptlim); continue; case 'U': pt = _conv((t->tm_yday + DAYSPERWEEK - t->tm_wday) / DAYSPERWEEK, PADDING(PAD_FMT_WEEKOFYEAR), 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, PADDING(PAD_FMT_WEEKOFYEAR), pt, ptlim); else if (*format == 'g') { 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(loc, "%e-%b-%Y", t, pt, ptlim); continue; case 'W': pt = _conv((t->tm_yday + DAYSPERWEEK - (t->tm_wday ? (t->tm_wday - 1) : (DAYSPERWEEK - 1))) / DAYSPERWEEK, PADDING(PAD_FMT_WEEKOFYEAR), pt, ptlim); continue; case 'w': pt = _conv(t->tm_wday, "%d", pt, ptlim); continue; case 'X': pt = _fmt(loc, tptr->X_fmt, t, pt, ptlim); continue; case 'x': pt = _fmt(loc, tptr->x_fmt, t, pt, ptlim); continue; case 'y': 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_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; /* * 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) diff = -timezone; else diff = -altzone; if (diff < 0) { sign = "-"; diff = -diff; } else sign = "+"; pt = _add(sign, pt, ptlim); diff /= SECSPERMIN; diff = (diff / MINSPERHOUR) * 100 + (diff % MINSPERHOUR); pt = _conv(diff, PADDING(PAD_FMT_YEAR), pt, ptlim); } continue; case '+': pt = _fmt(loc, tptr->date_fmt, t, pt, ptlim); 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(const int n, const char *format, char *const pt, const char *const ptlim) { char buf[12]; (void) sprintf(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); }