From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from m0.truegem.net (m0.truegem.net [69.55.228.47]) by sourceware.org (Postfix) with ESMTPS id 0C88D388A820 for ; Wed, 13 May 2020 08:24:21 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org 0C88D388A820 Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=maxrnd.com Authentication-Results: sourceware.org; spf=none smtp.mailfrom=mark@maxrnd.com Received: (from daemon@localhost) by m0.truegem.net (8.12.11/8.12.11) id 04D8OKCj090263; Wed, 13 May 2020 01:24:20 -0700 (PDT) (envelope-from mark@maxrnd.com) Received: from 162-235-43-67.lightspeed.irvnca.sbcglobal.net(162.235.43.67), claiming to be "localhost.localdomain" via SMTP by m0.truegem.net, id smtpdxGj5o3; Wed May 13 01:24:14 2020 From: Mark Geisert To: cygwin-patches@cygwin.com Subject: [Cygwin PATCH 4/9] tzcode resync: localtime.c.patched Date: Wed, 13 May 2020 01:23:44 -0700 Message-Id: <20200513082349.831-4-mark@maxrnd.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20200513082349.831-1-mark@maxrnd.com> References: <20200513082349.831-1-mark@maxrnd.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-14.2 required=5.0 tests=BAYES_00, GIT_PATCH_0, KAM_DMARC_STATUS, KAM_LAZY_DOMAIN_SECURITY, SCC_5_SHORT_WORD_LINES, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: cygwin-patches@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Cygwin core component patch submission and discussion List-Unsubscribe: , List-Archive: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 13 May 2020 08:24:29 -0000 Patched copy of NetBSD's localtime.c to hold changes that could not be accomplished in the wrapper file localtime.cc. It is this file that compilation of localtime.cc includes. --- winsup/cygwin/tzcode/localtime.c.patched | 2509 ++++++++++++++++++++++ 1 file changed, 2509 insertions(+) create mode 100644 winsup/cygwin/tzcode/localtime.c.patched diff --git a/winsup/cygwin/tzcode/localtime.c.patched b/winsup/cygwin/tzcode/localtime.c.patched new file mode 100644 index 000000000..58e45d2bc --- /dev/null +++ b/winsup/cygwin/tzcode/localtime.c.patched @@ -0,0 +1,2509 @@ +// localtime.c.patched: based on NetBSD's localtime.c version 1.122 +/* $NetBSD: localtime.c,v 1.122 2019/07/03 15:50:16 christos Exp $ */ + +/* Convert timestamp from time_t to struct tm. */ + +/* +** This file is in the public domain, so clarified as of +** 1996-06-05 by Arthur David Olson. +*/ + +#include +#if defined(LIBC_SCCS) && !defined(lint) +#if 0 +static char elsieid[] = "@(#)localtime.c 8.17"; +#else +__RCSID("$NetBSD: localtime.c,v 1.122 2019/07/03 15:50:16 christos Exp $"); +#endif +#endif /* LIBC_SCCS and not lint */ + +/* +** Leap second handling from Bradley White. +** POSIX-style TZ environment variable handling from Guy Harris. +*/ + +/*LINTLIBRARY*/ + +#include "namespace.h" +#include +#define LOCALTIME_IMPLEMENTATION +#include "private.h" + +#include "tzfile.h" +#include + +#if NETBSD_INSPIRED +# define NETBSD_INSPIRED_EXTERN +#else +# define NETBSD_INSPIRED_EXTERN static +#endif + +#if defined(__weak_alias) +__weak_alias(daylight,_daylight) +__weak_alias(tzname,_tzname) +#endif + +#ifndef TZ_ABBR_MAX_LEN +#define TZ_ABBR_MAX_LEN 16 +#endif /* !defined TZ_ABBR_MAX_LEN */ + +#ifndef TZ_ABBR_CHAR_SET +#define TZ_ABBR_CHAR_SET \ + "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789 :+-._" +#endif /* !defined TZ_ABBR_CHAR_SET */ + +#ifndef TZ_ABBR_ERR_CHAR +#define TZ_ABBR_ERR_CHAR '_' +#endif /* !defined TZ_ABBR_ERR_CHAR */ + +/* +** SunOS 4.1.1 headers lack O_BINARY. +*/ + +#ifdef O_BINARY +#define OPEN_MODE (O_RDONLY | O_BINARY | O_CLOEXEC) +#endif /* defined O_BINARY */ +#ifndef O_BINARY +#define OPEN_MODE (O_RDONLY | O_CLOEXEC) +#endif /* !defined O_BINARY */ + +#ifndef WILDABBR +/* +** Someone might make incorrect use of a time zone abbreviation: +** 1. They might reference tzname[0] before calling tzset (explicitly +** or implicitly). +** 2. They might reference tzname[1] before calling tzset (explicitly +** or implicitly). +** 3. They might reference tzname[1] after setting to a time zone +** in which Daylight Saving Time is never observed. +** 4. They might reference tzname[0] after setting to a time zone +** in which Standard Time is never observed. +** 5. They might reference tm.TM_ZONE after calling offtime. +** What's best to do in the above cases is open to debate; +** for now, we just set things up so that in any of the five cases +** WILDABBR is used. Another possibility: initialize tzname[0] to the +** string "tzname[0] used before set", and similarly for the other cases. +** And another: initialize tzname[0] to "ERA", with an explanation in the +** manual page of what this "time zone abbreviation" means (doing this so +** that tzname[0] has the "normal" length of three characters). +*/ +#define WILDABBR " " +#endif /* !defined WILDABBR */ + +static const char wildabbr[] = WILDABBR; + +static const char gmt[] = "GMT"; + +/* +** The DST rules to use if TZ has no rules and we can't load TZDEFRULES. +** Default to US rules as of 2017-05-07. +** POSIX does not specify the default DST rules; +** for historical reasons, US rules are a common default. +*/ +#ifndef TZDEFRULESTRING +#define TZDEFRULESTRING ",M3.2.0,M11.1.0" +#endif + +struct ttinfo { /* time type information */ + int_fast32_t tt_utoff; /* UT offset in seconds */ + bool tt_isdst; /* used to set tm_isdst */ + int tt_desigidx; /* abbreviation list index */ + bool tt_ttisstd; /* transition is std time */ + bool tt_ttisut; /* transition is UT */ +}; + +struct lsinfo { /* leap second information */ + time_t ls_trans; /* transition time */ + int_fast64_t ls_corr; /* correction to apply */ +}; + +#define SMALLEST(a, b) (((a) < (b)) ? (a) : (b)) +#define BIGGEST(a, b) (((a) > (b)) ? (a) : (b)) + +#ifdef TZNAME_MAX +#define MY_TZNAME_MAX TZNAME_MAX +#endif /* defined TZNAME_MAX */ +#ifndef TZNAME_MAX +#define MY_TZNAME_MAX 255 +#endif /* !defined TZNAME_MAX */ + +#define state __state +struct state { + int leapcnt; + int timecnt; + int typecnt; + int charcnt; + bool goback; + bool goahead; + time_t ats[TZ_MAX_TIMES]; + unsigned char types[TZ_MAX_TIMES]; + struct ttinfo ttis[TZ_MAX_TYPES]; + char chars[/*CONSTCOND*/BIGGEST(BIGGEST(TZ_MAX_CHARS + 1, + sizeof gmt), (2 * (MY_TZNAME_MAX + 1)))]; + struct lsinfo lsis[TZ_MAX_LEAPS]; + + /* The time type to use for early times or if no transitions. + It is always zero for recent tzdb releases. + It might be nonzero for data from tzdb 2018e or earlier. */ + int defaulttype; +}; + +enum r_type { + JULIAN_DAY, /* Jn = Julian day */ + DAY_OF_YEAR, /* n = day of year */ + MONTH_NTH_DAY_OF_WEEK /* Mm.n.d = month, week, day of week */ +}; + +struct rule { + enum r_type r_type; /* type of rule */ + int r_day; /* day number of rule */ + int r_week; /* week number of rule */ + int r_mon; /* month number of rule */ + int_fast32_t r_time; /* transition time of rule */ +}; + +static struct tm *gmtsub(struct state const *, time_t const *, int_fast32_t, + struct tm *); +static bool increment_overflow(int *, int); +static bool increment_overflow_time(time_t *, int_fast32_t); +static bool normalize_overflow32(int_fast32_t *, int *, int); +static struct tm *timesub(time_t const *, int_fast32_t, struct state const *, + struct tm *); +static bool typesequiv(struct state const *, int, int); +static bool tzparse(char const *, struct state *, bool); + +static timezone_t gmtptr; + +#ifndef TZ_STRLEN_MAX +#define TZ_STRLEN_MAX 255 +#endif /* !defined TZ_STRLEN_MAX */ + +static char lcl_TZname[TZ_STRLEN_MAX + 1]; +static int lcl_is_set; + + +#if !defined(__LIBC12_SOURCE__) +#ifdef __CYGWIN__ +static +#endif +timezone_t __lclptr; +#ifdef _REENTRANT +rwlock_t __lcl_lock = RWLOCK_INITIALIZER; +#endif +#endif + +/* +** Section 4.12.3 of X3.159-1989 requires that +** Except for the strftime function, these functions [asctime, +** ctime, gmtime, localtime] return values in one of two static +** objects: a broken-down time structure and an array of char. +** Thanks to Paul Eggert for noting this. +*/ + +static struct tm tm; + +#if !HAVE_POSIX_DECLS || TZ_TIME_T || defined(__NetBSD__) || defined(__CYGWIN__) +# if !defined(__LIBC12_SOURCE__) + +__aconst char * tzname[2] = { + (__aconst char *)__UNCONST(wildabbr), + (__aconst char *)__UNCONST(wildabbr) +}; + +# else + +extern __aconst char * tzname[2]; + +# endif /* __LIBC12_SOURCE__ */ + +# if USG_COMPAT +# if !defined(__LIBC12_SOURCE__) +long timezone = 0; +int daylight = 0; +# else +extern int daylight; +extern long timezone __RENAME(__timezone13); +# endif /* __LIBC12_SOURCE__ */ +# endif /* defined USG_COMPAT */ + +# ifdef ALTZONE +long altzone = 0; +# endif /* defined ALTZONE */ +#endif /* !HAVE_POSIX_DECLS */ + +/* Initialize *S to a value based on UTOFF, ISDST, and DESIGIDX. */ +static void +init_ttinfo(struct ttinfo *s, int_fast32_t utoff, bool isdst, int desigidx) +{ + s->tt_utoff = utoff; + s->tt_isdst = isdst; + s->tt_desigidx = desigidx; + s->tt_ttisstd = false; + s->tt_ttisut = false; +} + +static int_fast32_t +detzcode(const char *const codep) +{ + int_fast32_t result; + int i; + int_fast32_t one = 1; + int_fast32_t halfmaxval = one << (32 - 2); + int_fast32_t maxval = halfmaxval - 1 + halfmaxval; + int_fast32_t minval = -1 - maxval; + + result = codep[0] & 0x7f; + for (i = 1; i < 4; ++i) + result = (result << 8) | (codep[i] & 0xff); + + if (codep[0] & 0x80) { + /* Do two's-complement negation even on non-two's-complement machines. + If the result would be minval - 1, return minval. */ + result -= !TWOS_COMPLEMENT(int_fast32_t) && result != 0; + result += minval; + } + return result; +} + +static int_fast64_t +detzcode64(const char *const codep) +{ + int_fast64_t result; + int i; + int_fast64_t one = 1; + int_fast64_t halfmaxval = one << (64 - 2); + int_fast64_t maxval = halfmaxval - 1 + halfmaxval; + int_fast64_t minval = -TWOS_COMPLEMENT(int_fast64_t) - maxval; + + result = codep[0] & 0x7f; + for (i = 1; i < 8; ++i) + result = (result << 8) | (codep[i] & 0xff); + + if (codep[0] & 0x80) { + /* Do two's-complement negation even on non-two's-complement machines. + If the result would be minval - 1, return minval. */ + result -= !TWOS_COMPLEMENT(int_fast64_t) && result != 0; + result += minval; + } + return result; +} + +#include + +const char * +tzgetname(const timezone_t sp, int isdst) +{ + int i; + const char *name = NULL; + for (i = 0; i < sp->typecnt; ++i) { + const struct ttinfo *const ttisp = &sp->ttis[i]; + if (ttisp->tt_isdst == isdst) + name = &sp->chars[ttisp->tt_desigidx]; + } + if (name != NULL) + return name; + errno = ESRCH; + return NULL; +} + +long +tzgetgmtoff(const timezone_t sp, int isdst) +{ + int i; + long l = -1; + for (i = 0; i < sp->typecnt; ++i) { + const struct ttinfo *const ttisp = &sp->ttis[i]; + + if (ttisp->tt_isdst == isdst) { + l = ttisp->tt_utoff; + } + } + if (l == -1) + errno = ESRCH; + return l; +} + +static void +scrub_abbrs(struct state *sp) +{ + int i; + + /* + ** First, replace bogus characters. + */ + for (i = 0; i < sp->charcnt; ++i) + if (strchr(TZ_ABBR_CHAR_SET, sp->chars[i]) == NULL) + sp->chars[i] = TZ_ABBR_ERR_CHAR; + /* + ** Second, truncate long abbreviations. + */ + for (i = 0; i < sp->typecnt; ++i) { + const struct ttinfo * const ttisp = &sp->ttis[i]; + char *cp = &sp->chars[ttisp->tt_desigidx]; + + if (strlen(cp) > TZ_ABBR_MAX_LEN && + strcmp(cp, GRANDPARENTED) != 0) + *(cp + TZ_ABBR_MAX_LEN) = '\0'; + } +} + +static void +update_tzname_etc(const struct state *sp, const struct ttinfo *ttisp) +{ +#if HAVE_TZNAME + tzname[ttisp->tt_isdst] = __UNCONST(&sp->chars[ttisp->tt_desigidx]); +#endif +#if USG_COMPAT + if (!ttisp->tt_isdst) + timezone = - ttisp->tt_utoff; +#endif +#ifdef ALTZONE + if (ttisp->tt_isdst) + altzone = - ttisp->tt_utoff; +#endif /* defined ALTZONE */ +} + +static void +settzname(void) +{ + timezone_t const sp = __lclptr; + int i; + +#if HAVE_TZNAME + tzname[0] = tzname[1] = + (__aconst char *) __UNCONST(sp ? wildabbr : gmt); +#endif +#if USG_COMPAT + daylight = 0; + timezone = 0; +#endif +#ifdef ALTZONE + altzone = 0; +#endif /* defined ALTZONE */ + if (sp == NULL) { + return; + } + /* + ** And to get the latest time zone abbreviations into tzname. . . + */ + for (i = 0; i < sp->typecnt; ++i) + update_tzname_etc(sp, &sp->ttis[i]); + + for (i = 0; i < sp->timecnt; ++i) { + const struct ttinfo * const ttisp = &sp->ttis[sp->types[i]]; + update_tzname_etc(sp, ttisp); +#if USG_COMPAT + if (ttisp->tt_isdst) + daylight = 1; +#endif + } +} + +static bool +differ_by_repeat(const time_t t1, const time_t t0) +{ + if (TYPE_BIT(time_t) - TYPE_SIGNED(time_t) < SECSPERREPEAT_BITS) + return 0; + return (int_fast64_t)t1 - (int_fast64_t)t0 == SECSPERREPEAT; +} + +union input_buffer { + /* The first part of the buffer, interpreted as a header. */ + struct tzhead tzhead; + + /* The entire buffer. */ + char buf[2 * sizeof(struct tzhead) + 2 * sizeof (struct state) + + 4 * TZ_MAX_TIMES]; +}; + +/* TZDIR with a trailing '/' rather than a trailing '\0'. */ +static char const tzdirslash[] = TZDIR "/"; +#define sizeof_tzdirslash (sizeof tzdirslash - 1) + +/* Local storage needed for 'tzloadbody'. */ +union local_storage { + /* The results of analyzing the file's contents after it is opened. */ + struct file_analysis { + /* The input buffer. */ + union input_buffer u; + + /* A temporary state used for parsing a TZ string in the file. */ + struct state st; + } u; + + /* The file name to be opened. */ + char fullname[/*CONSTCOND*/BIGGEST(sizeof (struct file_analysis), + sizeof_tzdirslash + 1024)]; +}; + +/* Load tz data from the file named NAME into *SP. Read extended + format if DOEXTEND. Use *LSP for temporary storage. Return 0 on + success, an errno value on failure. */ +static int +tzloadbody(char const *name, struct state *sp, bool doextend, + union local_storage *lsp) +{ + int i; + int fid; + int stored; + ssize_t nread; + bool doaccess; + union input_buffer *up = &lsp->u.u; + size_t tzheadsize = sizeof(struct tzhead); + + sp->goback = sp->goahead = false; + + if (! name) { + name = TZDEFAULT; + if (! name) + return EINVAL; + } + + if (name[0] == ':') + ++name; +#ifdef SUPPRESS_TZDIR + /* Do not prepend TZDIR. This is intended for specialized + applications only, due to its security implications. */ + doaccess = true; +#else + doaccess = name[0] == '/'; +#endif + if (!doaccess) { + char const *dot; + size_t namelen = strlen(name); + if (sizeof lsp->fullname - sizeof_tzdirslash <= namelen) + return ENAMETOOLONG; + + /* Create a string "TZDIR/NAME". Using sprintf here + would pull in stdio (and would fail if the + resulting string length exceeded INT_MAX!). */ + memcpy(lsp->fullname, tzdirslash, sizeof_tzdirslash); + strcpy(lsp->fullname + sizeof_tzdirslash, name); + + /* Set doaccess if NAME contains a ".." file name + component, as such a name could read a file outside + the TZDIR virtual subtree. */ + for (dot = name; (dot = strchr(dot, '.')) != NULL; dot++) + if ((dot == name || dot[-1] == '/') && dot[1] == '.' + && (dot[2] == '/' || !dot[2])) { + doaccess = true; + break; + } + + name = lsp->fullname; + } + if (doaccess && access(name, R_OK) != 0) + goto trydefrules; + + fid = open(name, OPEN_MODE); + if (fid < 0) + goto trydefrules; + nread = read(fid, up->buf, sizeof up->buf); + if (nread < (ssize_t)tzheadsize) { + int err = nread < 0 ? errno : EINVAL; + close(fid); + return err; + } + if (close(fid) < 0) + return errno; + if (0) { +trydefrules: + const char *base = strrchr(name, '/'); + base = base ? base + 1 : name; + if (strcmp(base, TZDEFRULES)) + return errno; + nread = sizeof _posixrules_data; + memcpy(up->buf, _posixrules_data, nread); + } + for (stored = 4; stored <= 8; stored *= 2) { + int_fast32_t ttisstdcnt = detzcode(up->tzhead.tzh_ttisstdcnt); + int_fast32_t ttisutcnt = detzcode(up->tzhead.tzh_ttisutcnt); + int_fast64_t prevtr = 0; + int_fast32_t prevcorr = 0; + int_fast32_t leapcnt = detzcode(up->tzhead.tzh_leapcnt); + int_fast32_t timecnt = detzcode(up->tzhead.tzh_timecnt); + int_fast32_t typecnt = detzcode(up->tzhead.tzh_typecnt); + int_fast32_t charcnt = detzcode(up->tzhead.tzh_charcnt); + char const *p = up->buf + tzheadsize; + /* Although tzfile(5) currently requires typecnt to be nonzero, + support future formats that may allow zero typecnt + in files that have a TZ string and no transitions. */ + if (! (0 <= leapcnt && leapcnt < TZ_MAX_LEAPS + && 0 <= typecnt && typecnt < TZ_MAX_TYPES + && 0 <= timecnt && timecnt < TZ_MAX_TIMES + && 0 <= charcnt && charcnt < TZ_MAX_CHARS + && (ttisstdcnt == typecnt || ttisstdcnt == 0) + && (ttisutcnt == typecnt || ttisutcnt == 0))) + return EINVAL; + if ((size_t)nread + < (tzheadsize /* struct tzhead */ + + timecnt * stored /* ats */ + + timecnt /* types */ + + typecnt * 6 /* ttinfos */ + + charcnt /* chars */ + + leapcnt * (stored + 4) /* lsinfos */ + + ttisstdcnt /* ttisstds */ + + ttisutcnt)) /* ttisuts */ + return EINVAL; + sp->leapcnt = leapcnt; + sp->timecnt = timecnt; + sp->typecnt = typecnt; + sp->charcnt = charcnt; + + /* Read transitions, discarding those out of time_t range. + But pretend the last transition before TIME_T_MIN + occurred at TIME_T_MIN. */ + timecnt = 0; + for (i = 0; i < sp->timecnt; ++i) { + int_fast64_t at + = stored == 4 ? detzcode(p) : detzcode64(p); + sp->types[i] = at <= TIME_T_MAX; + if (sp->types[i]) { + time_t attime + = ((TYPE_SIGNED(time_t) ? + at < TIME_T_MIN : at < 0) + ? TIME_T_MIN : (time_t)at); + if (timecnt && attime <= sp->ats[timecnt - 1]) { + if (attime < sp->ats[timecnt - 1]) + return EINVAL; + sp->types[i - 1] = 0; + timecnt--; + } + sp->ats[timecnt++] = attime; + } + p += stored; + } + + timecnt = 0; + for (i = 0; i < sp->timecnt; ++i) { + unsigned char typ = *p++; + if (sp->typecnt <= typ) + return EINVAL; + if (sp->types[i]) + sp->types[timecnt++] = typ; + } + sp->timecnt = timecnt; + for (i = 0; i < sp->typecnt; ++i) { + struct ttinfo * ttisp; + unsigned char isdst, desigidx; + + ttisp = &sp->ttis[i]; + ttisp->tt_utoff = detzcode(p); + p += 4; + isdst = *p++; + if (! (isdst < 2)) + return EINVAL; + ttisp->tt_isdst = isdst; + desigidx = *p++; + if (! (desigidx < sp->charcnt)) + return EINVAL; + ttisp->tt_desigidx = desigidx; + } + for (i = 0; i < sp->charcnt; ++i) + sp->chars[i] = *p++; + sp->chars[i] = '\0'; /* ensure '\0' at end */ + + /* Read leap seconds, discarding those out of time_t range. */ + leapcnt = 0; + for (i = 0; i < sp->leapcnt; ++i) { + int_fast64_t tr = stored == 4 ? detzcode(p) : + detzcode64(p); + int_fast32_t corr = detzcode(p + stored); + p += stored + 4; + /* Leap seconds cannot occur before the Epoch. */ + if (tr < 0) + return EINVAL; + if (tr <= TIME_T_MAX) { + /* Leap seconds cannot occur more than once per UTC month, + and UTC months are at least 28 days long (minus 1 + second for a negative leap second). Each leap second's + correction must differ from the previous one's by 1 + second. */ + if (tr - prevtr < 28 * SECSPERDAY - 1 + || (corr != prevcorr - 1 + && corr != prevcorr + 1)) + return EINVAL; + + sp->lsis[leapcnt].ls_trans = + (time_t)(prevtr = tr); + sp->lsis[leapcnt].ls_corr = prevcorr = corr; + leapcnt++; + } + } + sp->leapcnt = leapcnt; + + for (i = 0; i < sp->typecnt; ++i) { + struct ttinfo * ttisp; + + ttisp = &sp->ttis[i]; + if (ttisstdcnt == 0) + ttisp->tt_ttisstd = false; + else { + if (*p != true && *p != false) + return EINVAL; + ttisp->tt_ttisstd = *p++; + } + } + for (i = 0; i < sp->typecnt; ++i) { + struct ttinfo * ttisp; + + ttisp = &sp->ttis[i]; + if (ttisutcnt == 0) + ttisp->tt_ttisut = false; + else { + if (*p != true && *p != false) + return EINVAL; + ttisp->tt_ttisut = *p++; + } + } + /* + ** If this is an old file, we're done. + */ + if (up->tzhead.tzh_version[0] == '\0') + break; + nread -= p - up->buf; + memmove(up->buf, p, (size_t)nread); + } + if (doextend && nread > 2 && + up->buf[0] == '\n' && up->buf[nread - 1] == '\n' && + sp->typecnt + 2 <= TZ_MAX_TYPES) { + struct state *ts = &lsp->u.st; + + up->buf[nread - 1] = '\0'; + if (tzparse(&up->buf[1], ts, false)) { + + /* Attempt to reuse existing abbreviations. + Without this, America/Anchorage would be right on + the edge after 2037 when TZ_MAX_CHARS is 50, as + sp->charcnt equals 40 (for LMT AST AWT APT AHST + AHDT YST AKDT AKST) and ts->charcnt equals 10 + (for AKST AKDT). Reusing means sp->charcnt can + stay 40 in this example. */ + int gotabbr = 0; + int charcnt = sp->charcnt; + for (i = 0; i < ts->typecnt; i++) { + char *tsabbr = ts->chars + ts->ttis[i].tt_desigidx; + int j; + for (j = 0; j < charcnt; j++) + if (strcmp(sp->chars + j, tsabbr) == 0) { + ts->ttis[i].tt_desigidx = j; + gotabbr++; + break; + } + if (! (j < charcnt)) { + size_t tsabbrlen = strlen(tsabbr); + if (j + tsabbrlen < TZ_MAX_CHARS) { + strcpy(sp->chars + j, tsabbr); + charcnt = (int_fast32_t)(j + tsabbrlen + 1); + ts->ttis[i].tt_desigidx = j; + gotabbr++; + } + } + } + if (gotabbr == ts->typecnt) { + sp->charcnt = charcnt; + + /* Ignore any trailing, no-op transitions generated + by zic as they don't help here and can run afoul + of bugs in zic 2016j or earlier. */ + while (1 < sp->timecnt + && (sp->types[sp->timecnt - 1] + == sp->types[sp->timecnt - 2])) + sp->timecnt--; + + for (i = 0; i < ts->timecnt; i++) + if (sp->timecnt == 0 + || sp->ats[sp->timecnt - 1] < ts->ats[i]) + break; + while (i < ts->timecnt + && sp->timecnt < TZ_MAX_TIMES) { + sp->ats[sp->timecnt] = ts->ats[i]; + sp->types[sp->timecnt] = (sp->typecnt + + ts->types[i]); + sp->timecnt++; + i++; + } + for (i = 0; i < ts->typecnt; i++) + sp->ttis[sp->typecnt++] = ts->ttis[i]; + } + } + } + if (sp->typecnt == 0) + return EINVAL; + if (sp->timecnt > 1) { + for (i = 1; i < sp->timecnt; ++i) + if (typesequiv(sp, sp->types[i], sp->types[0]) && + differ_by_repeat(sp->ats[i], sp->ats[0])) { + sp->goback = true; + break; + } + for (i = sp->timecnt - 2; i >= 0; --i) + if (typesequiv(sp, sp->types[sp->timecnt - 1], + sp->types[i]) && + differ_by_repeat(sp->ats[sp->timecnt - 1], + sp->ats[i])) { + sp->goahead = true; + break; + } + } + + /* Infer sp->defaulttype from the data. Although this default + type is always zero for data from recent tzdb releases, + things are trickier for data from tzdb 2018e or earlier. + + The first set of heuristics work around bugs in 32-bit data + generated by tzdb 2013c or earlier. The workaround is for + zones like Australia/Macquarie where timestamps before the + first transition have a time type that is not the earliest + standard-time type. See: + https://mm.icann.org/pipermail/tz/2013-May/019368.html */ + /* + ** If type 0 is unused in transitions, + ** it's the type to use for early times. + */ + for (i = 0; i < sp->timecnt; ++i) + if (sp->types[i] == 0) + break; + i = i < sp->timecnt ? -1 : 0; + /* + ** Absent the above, + ** if there are transition times + ** and the first transition is to a daylight time + ** find the standard type less than and closest to + ** the type of the first transition. + */ + if (i < 0 && sp->timecnt > 0 && sp->ttis[sp->types[0]].tt_isdst) { + i = sp->types[0]; + while (--i >= 0) + if (!sp->ttis[i].tt_isdst) + break; + } + /* The next heuristics are for data generated by tzdb 2018e or + earlier, for zones like EST5EDT where the first transition + is to DST. */ + /* + ** If no result yet, find the first standard type. + ** If there is none, punt to type zero. + */ + if (i < 0) { + i = 0; + while (sp->ttis[i].tt_isdst) + if (++i >= sp->typecnt) { + i = 0; + break; + } + } + /* A simple 'sp->defaulttype = 0;' would suffice here if we + didn't have to worry about 2018e-or-earlier data. Even + simpler would be to remove the defaulttype member and just + use 0 in its place. */ + sp->defaulttype = i; + + return 0; +} + +/* Load tz data from the file named NAME into *SP. Read extended + format if DOEXTEND. Return 0 on success, an errno value on failure. */ +static int +tzload(char const *name, struct state *sp, bool doextend) +{ + union local_storage *lsp = (union local_storage *) calloc(1, sizeof *lsp); + if (!lsp) + return errno; + else { + int err = tzloadbody(name, sp, doextend, lsp); + free(lsp); + return err; + } +} + +static bool +typesequiv(const struct state *sp, int a, int b) +{ + bool result; + + if (sp == NULL || + a < 0 || a >= sp->typecnt || + b < 0 || b >= sp->typecnt) + result = false; + else { + const struct ttinfo * ap = &sp->ttis[a]; + const struct ttinfo * bp = &sp->ttis[b]; + result = (ap->tt_utoff == bp->tt_utoff + && ap->tt_isdst == bp->tt_isdst + && ap->tt_ttisstd == bp->tt_ttisstd + && ap->tt_ttisut == bp->tt_ttisut + && (strcmp(&sp->chars[ap->tt_desigidx], + &sp->chars[bp->tt_desigidx]) + == 0)); + } + return result; +} + +static const int mon_lengths[2][MONSPERYEAR] = { + { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, + { 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } +}; + +static const int year_lengths[2] = { + DAYSPERNYEAR, DAYSPERLYEAR +}; + +/* +** Given a pointer into a timezone string, scan until a character that is not +** a valid character in a time zone abbreviation is found. +** Return a pointer to that character. +*/ + +static ATTRIBUTE_PURE const char * +getzname(const char *strp) +{ + char c; + + while ((c = *strp) != '\0' && !is_digit(c) && c != ',' && c != '-' && + c != '+') + ++strp; + return strp; +} + +/* +** Given a pointer into an extended timezone string, scan until the ending +** delimiter of the time zone abbreviation is located. +** Return a pointer to the delimiter. +** +** As with getzname above, the legal character set is actually quite +** restricted, with other characters producing undefined results. +** We don't do any checking here; checking is done later in common-case code. +*/ + +static ATTRIBUTE_PURE const char * +getqzname(const char *strp, const int delim) +{ + int c; + + while ((c = *strp) != '\0' && c != delim) + ++strp; + return strp; +} + +/* +** Given a pointer into a timezone string, extract a number from that string. +** Check that the number is within a specified range; if it is not, return +** NULL. +** Otherwise, return a pointer to the first character not part of the number. +*/ + +static const char * +getnum(const char *strp, int *const nump, const int min, const int max) +{ + char c; + int num; + + if (strp == NULL || !is_digit(c = *strp)) { + errno = EINVAL; + return NULL; + } + num = 0; + do { + num = num * 10 + (c - '0'); + if (num > max) { + errno = EOVERFLOW; + return NULL; /* illegal value */ + } + c = *++strp; + } while (is_digit(c)); + if (num < min) { + errno = EINVAL; + return NULL; /* illegal value */ + } + *nump = num; + return strp; +} + +/* +** Given a pointer into a timezone string, extract a number of seconds, +** in hh[:mm[:ss]] form, from the string. +** If any error occurs, return NULL. +** Otherwise, return a pointer to the first character not part of the number +** of seconds. +*/ + +static const char * +getsecs(const char *strp, int_fast32_t *const secsp) +{ + int num; + + /* + ** 'HOURSPERDAY * DAYSPERWEEK - 1' allows quasi-Posix rules like + ** "M10.4.6/26", which does not conform to Posix, + ** but which specifies the equivalent of + ** "02:00 on the first Sunday on or after 23 Oct". + */ + strp = getnum(strp, &num, 0, HOURSPERDAY * DAYSPERWEEK - 1); + if (strp == NULL) + return NULL; + *secsp = num * (int_fast32_t) SECSPERHOUR; + if (*strp == ':') { + ++strp; + strp = getnum(strp, &num, 0, MINSPERHOUR - 1); + if (strp == NULL) + return NULL; + *secsp += num * SECSPERMIN; + if (*strp == ':') { + ++strp; + /* 'SECSPERMIN' allows for leap seconds. */ + strp = getnum(strp, &num, 0, SECSPERMIN); + if (strp == NULL) + return NULL; + *secsp += num; + } + } + return strp; +} + +/* +** Given a pointer into a timezone string, extract an offset, in +** [+-]hh[:mm[:ss]] form, from the string. +** If any error occurs, return NULL. +** Otherwise, return a pointer to the first character not part of the time. +*/ + +static const char * +getoffset(const char *strp, int_fast32_t *const offsetp) +{ + bool neg = false; + + if (*strp == '-') { + neg = true; + ++strp; + } else if (*strp == '+') + ++strp; + strp = getsecs(strp, offsetp); + if (strp == NULL) + return NULL; /* illegal time */ + if (neg) + *offsetp = -*offsetp; + return strp; +} + +/* +** Given a pointer into a timezone string, extract a rule in the form +** date[/time]. See POSIX section 8 for the format of "date" and "time". +** If a valid rule is not found, return NULL. +** Otherwise, return a pointer to the first character not part of the rule. +*/ + +static const char * +getrule(const char *strp, struct rule *const rulep) +{ + if (*strp == 'J') { + /* + ** Julian day. + */ + rulep->r_type = JULIAN_DAY; + ++strp; + strp = getnum(strp, &rulep->r_day, 1, DAYSPERNYEAR); + } else if (*strp == 'M') { + /* + ** Month, week, day. + */ + rulep->r_type = MONTH_NTH_DAY_OF_WEEK; + ++strp; + strp = getnum(strp, &rulep->r_mon, 1, MONSPERYEAR); + if (strp == NULL) + return NULL; + if (*strp++ != '.') + return NULL; + strp = getnum(strp, &rulep->r_week, 1, 5); + if (strp == NULL) + return NULL; + if (*strp++ != '.') + return NULL; + strp = getnum(strp, &rulep->r_day, 0, DAYSPERWEEK - 1); + } else if (is_digit(*strp)) { + /* + ** Day of year. + */ + rulep->r_type = DAY_OF_YEAR; + strp = getnum(strp, &rulep->r_day, 0, DAYSPERLYEAR - 1); + } else return NULL; /* invalid format */ + if (strp == NULL) + return NULL; + if (*strp == '/') { + /* + ** Time specified. + */ + ++strp; + strp = getoffset(strp, &rulep->r_time); + } else rulep->r_time = 2 * SECSPERHOUR; /* default = 2:00:00 */ + return strp; +} + +/* +** Given a year, a rule, and the offset from UT at the time that rule takes +** effect, calculate the year-relative time that rule takes effect. +*/ + +static int_fast32_t +transtime(const int year, const struct rule *const rulep, + const int_fast32_t offset) +{ + bool leapyear; + int_fast32_t value; + int i; + int d, m1, yy0, yy1, yy2, dow; + + INITIALIZE(value); + leapyear = isleap(year); + switch (rulep->r_type) { + + case JULIAN_DAY: + /* + ** Jn - Julian day, 1 == January 1, 60 == March 1 even in leap + ** years. + ** In non-leap years, or if the day number is 59 or less, just + ** add SECSPERDAY times the day number-1 to the time of + ** January 1, midnight, to get the day. + */ + value = (rulep->r_day - 1) * SECSPERDAY; + if (leapyear && rulep->r_day >= 60) + value += SECSPERDAY; + break; + + case DAY_OF_YEAR: + /* + ** n - day of year. + ** Just add SECSPERDAY times the day number to the time of + ** January 1, midnight, to get the day. + */ + value = rulep->r_day * SECSPERDAY; + break; + + case MONTH_NTH_DAY_OF_WEEK: + /* + ** Mm.n.d - nth "dth day" of month m. + */ + + /* + ** Use Zeller's Congruence to get day-of-week of first day of + ** month. + */ + m1 = (rulep->r_mon + 9) % 12 + 1; + yy0 = (rulep->r_mon <= 2) ? (year - 1) : year; + yy1 = yy0 / 100; + yy2 = yy0 % 100; + dow = ((26 * m1 - 2) / 10 + + 1 + yy2 + yy2 / 4 + yy1 / 4 - 2 * yy1) % 7; + if (dow < 0) + dow += DAYSPERWEEK; + + /* + ** "dow" is the day-of-week of the first day of the month. Get + ** the day-of-month (zero-origin) of the first "dow" day of the + ** month. + */ + d = rulep->r_day - dow; + if (d < 0) + d += DAYSPERWEEK; + for (i = 1; i < rulep->r_week; ++i) { + if (d + DAYSPERWEEK >= + mon_lengths[leapyear][rulep->r_mon - 1]) + break; + d += DAYSPERWEEK; + } + + /* + ** "d" is the day-of-month (zero-origin) of the day we want. + */ + value = d * SECSPERDAY; + for (i = 0; i < rulep->r_mon - 1; ++i) + value += mon_lengths[leapyear][i] * SECSPERDAY; + break; + } + + /* + ** "value" is the year-relative time of 00:00:00 UT on the day in + ** question. To get the year-relative time of the specified local + ** time on that day, add the transition time and the current offset + ** from UT. + */ + return value + rulep->r_time + offset; +} + +/* +** Given a POSIX section 8-style TZ string, fill in the rule tables as +** appropriate. +*/ + +static bool +tzparse(const char *name, struct state *sp, bool lastditch) +{ + const char * stdname; + const char * dstname; + size_t stdlen; + size_t dstlen; + size_t charcnt; + int_fast32_t stdoffset; + int_fast32_t dstoffset; + char * cp; + bool load_ok; + + dstname = NULL; /* XXX gcc */ + stdname = name; + if (lastditch) { + stdlen = sizeof gmt - 1; + name += stdlen; + stdoffset = 0; + } else { + if (*name == '<') { + name++; + stdname = name; + name = getqzname(name, '>'); + if (*name != '>') + return false; + stdlen = name - stdname; + name++; + } else { + name = getzname(name); + stdlen = name - stdname; + } + if (!stdlen) + return false; + name = getoffset(name, &stdoffset); + if (name == NULL) + return false; + } + charcnt = stdlen + 1; + if (sizeof sp->chars < charcnt) + return false; + load_ok = tzload(TZDEFRULES, sp, false) == 0; + if (!load_ok) + sp->leapcnt = 0; /* so, we're off a little */ + if (*name != '\0') { + if (*name == '<') { + dstname = ++name; + name = getqzname(name, '>'); + if (*name != '>') + return false; + dstlen = name - dstname; + name++; + } else { + dstname = name; + name = getzname(name); + dstlen = name - dstname; /* length of DST abbr. */ + } + if (!dstlen) + return false; + charcnt += dstlen + 1; + if (sizeof sp->chars < charcnt) + return false; + if (*name != '\0' && *name != ',' && *name != ';') { + name = getoffset(name, &dstoffset); + if (name == NULL) + return false; + } else dstoffset = stdoffset - SECSPERHOUR; + if (*name == '\0' && !load_ok) + name = TZDEFRULESTRING; + if (*name == ',' || *name == ';') { + struct rule start; + struct rule end; + int year; + int yearlim; + int timecnt; + time_t janfirst; + int_fast32_t janoffset = 0; + int yearbeg; + + ++name; + if ((name = getrule(name, &start)) == NULL) + return false; + if (*name++ != ',') + return false; + if ((name = getrule(name, &end)) == NULL) + return false; + if (*name != '\0') + return false; + sp->typecnt = 2; /* standard time and DST */ + /* + ** Two transitions per year, from EPOCH_YEAR forward. + */ + init_ttinfo(&sp->ttis[0], -stdoffset, false, 0); + init_ttinfo(&sp->ttis[1], -dstoffset, true, + (int)(stdlen + 1)); + sp->defaulttype = 0; + timecnt = 0; + janfirst = 0; + yearbeg = EPOCH_YEAR; + + do { + int_fast32_t yearsecs + = year_lengths[isleap(yearbeg - 1)] * SECSPERDAY; + yearbeg--; + if (increment_overflow_time(&janfirst, -yearsecs)) { + janoffset = -yearsecs; + break; + } + } while (EPOCH_YEAR - YEARSPERREPEAT / 2 < yearbeg); + + yearlim = yearbeg + YEARSPERREPEAT + 1; + for (year = yearbeg; year < yearlim; year++) { + int_fast32_t + starttime = transtime(year, &start, stdoffset), + endtime = transtime(year, &end, dstoffset); + int_fast32_t + yearsecs = (year_lengths[isleap(year)] + * SECSPERDAY); + bool reversed = endtime < starttime; + if (reversed) { + int_fast32_t swap = starttime; + starttime = endtime; + endtime = swap; + } + if (reversed + || (starttime < endtime + && (endtime - starttime + < (yearsecs + + (stdoffset - dstoffset))))) { + if (TZ_MAX_TIMES - 2 < timecnt) + break; + sp->ats[timecnt] = janfirst; + if (! increment_overflow_time + (&sp->ats[timecnt], + janoffset + starttime)) + sp->types[timecnt++] = !reversed; + sp->ats[timecnt] = janfirst; + if (! increment_overflow_time + (&sp->ats[timecnt], + janoffset + endtime)) { + sp->types[timecnt++] = reversed; + yearlim = year + YEARSPERREPEAT + 1; + } + } + if (increment_overflow_time + (&janfirst, janoffset + yearsecs)) + break; + janoffset = 0; + } + sp->timecnt = timecnt; + if (! timecnt) { + sp->ttis[0] = sp->ttis[1]; + sp->typecnt = 1; /* Perpetual DST. */ + } else if (YEARSPERREPEAT < year - yearbeg) + sp->goback = sp->goahead = true; + } else { + int_fast32_t theirstdoffset; + int_fast32_t theirdstoffset; + int_fast32_t theiroffset; + bool isdst; + int i; + int j; + + if (*name != '\0') + return false; + /* + ** Initial values of theirstdoffset and theirdstoffset. + */ + theirstdoffset = 0; + for (i = 0; i < sp->timecnt; ++i) { + j = sp->types[i]; + if (!sp->ttis[j].tt_isdst) { + theirstdoffset = + - sp->ttis[j].tt_utoff; + break; + } + } + theirdstoffset = 0; + for (i = 0; i < sp->timecnt; ++i) { + j = sp->types[i]; + if (sp->ttis[j].tt_isdst) { + theirdstoffset = + - sp->ttis[j].tt_utoff; + break; + } + } + /* + ** Initially we're assumed to be in standard time. + */ + isdst = false; + theiroffset = theirstdoffset; + /* + ** Now juggle transition times and types + ** tracking offsets as you do. + */ + for (i = 0; i < sp->timecnt; ++i) { + j = sp->types[i]; + sp->types[i] = sp->ttis[j].tt_isdst; + if (sp->ttis[j].tt_ttisut) { + /* No adjustment to transition time */ + } else { + /* + ** If daylight saving time is in + ** effect, and the transition time was + ** not specified as standard time, add + ** the daylight saving time offset to + ** the transition time; otherwise, add + ** the standard time offset to the + ** transition time. + */ + /* + ** Transitions from DST to DDST + ** will effectively disappear since + ** POSIX provides for only one DST + ** offset. + */ + if (isdst && !sp->ttis[j].tt_ttisstd) { + sp->ats[i] += (time_t) + (dstoffset - theirdstoffset); + } else { + sp->ats[i] += (time_t) + (stdoffset - theirstdoffset); + } + } + theiroffset = -sp->ttis[j].tt_utoff; + if (sp->ttis[j].tt_isdst) + theirstdoffset = theiroffset; + else theirdstoffset = theiroffset; + } + /* + ** Finally, fill in ttis. + */ + init_ttinfo(&sp->ttis[0], -stdoffset, false, 0); + init_ttinfo(&sp->ttis[1], -dstoffset, true, + (int)(stdlen + 1)); + sp->typecnt = 2; + sp->defaulttype = 0; + } + } else { + dstlen = 0; + sp->typecnt = 1; /* only standard time */ + sp->timecnt = 0; + init_ttinfo(&sp->ttis[0], -stdoffset, false, 0); + init_ttinfo(&sp->ttis[1], 0, false, 0); + sp->defaulttype = 0; + } + sp->charcnt = (int)charcnt; + cp = sp->chars; + (void) memcpy(cp, stdname, stdlen); + cp += stdlen; + *cp++ = '\0'; + if (dstlen != 0) { + (void) memcpy(cp, dstname, dstlen); + *(cp + dstlen) = '\0'; + } + return true; +} + +static void +gmtload(struct state *const sp) +{ + if (tzload(gmt, sp, true) != 0) + (void) tzparse(gmt, sp, true); +} + +static int +zoneinit(struct state *sp, char const *name) +{ + if (name && ! name[0]) { + /* + ** User wants it fast rather than right. + */ + sp->leapcnt = 0; /* so, we're off a little */ + sp->timecnt = 0; + sp->typecnt = 1; + sp->charcnt = 0; + sp->goback = sp->goahead = false; + init_ttinfo(&sp->ttis[0], 0, false, 0); + strcpy(sp->chars, gmt); + sp->defaulttype = 0; + return 0; + } else { + int err = tzload(name, sp, true); + if (err != 0 && name && name[0] != ':' && + tzparse(name, sp, false)) + err = 0; + if (err == 0) + scrub_abbrs(sp); + return err; + } +} + +static void +tzsetlcl(char const *name) +{ + struct state *sp = __lclptr; + if (! name) + name = tzgetwintz(__UNCONST(wildabbr), (char *) alloca (512)); + int lcl = name ? strlen(name) < sizeof lcl_TZname : -1; + if (lcl < 0 ? lcl_is_set < 0 + : 0 < lcl_is_set && strcmp(lcl_TZname, name) == 0) + return; + + if (! sp) + __lclptr = sp = (struct state *) calloc(1, sizeof *__lclptr); + if (sp) { + if (zoneinit(sp, name) != 0) + zoneinit(sp, ""); + if (0 < lcl) + strcpy(lcl_TZname, name); + } + settzname(); + lcl_is_set = lcl; +} + +#ifdef STD_INSPIRED +void +tzsetwall(void) +{ + rwlock_wrlock(&__lcl_lock); + tzsetlcl(NULL); + rwlock_unlock(&__lcl_lock); +} +#endif + +void +tzset_unlocked(void) +{ + tzsetlcl(getenv("TZ")); +} + +void +tzset(void) +{ + rwlock_wrlock(&__lcl_lock); + tzset_unlocked(); + rwlock_unlock(&__lcl_lock); +} + +static void +gmtcheck(void) +{ + static bool gmt_is_set; + rwlock_wrlock(&__lcl_lock); + if (! gmt_is_set) { + gmtptr = (timezone_t) calloc(1, sizeof *gmtptr); + if (gmtptr) + gmtload(gmtptr); + gmt_is_set = true; + } + rwlock_unlock(&__lcl_lock); +} + +#if NETBSD_INSPIRED + +timezone_t +tzalloc(const char *name) +{ + timezone_t sp = (timezone_t) calloc(1, sizeof *sp); + if (sp) { + int err = zoneinit(sp, name); + if (err != 0) { + free(sp); + errno = err; + return NULL; + } + } + return sp; +} + +void +tzfree(timezone_t sp) +{ + free(sp); +} + +/* +** NetBSD 6.1.4 has ctime_rz, but omit it because POSIX says ctime and +** ctime_r are obsolescent and have potential security problems that +** ctime_rz would share. Callers can instead use localtime_rz + strftime. +** +** NetBSD 6.1.4 has tzgetname, but omit it because it doesn't work +** in zones with three or more time zone abbreviations. +** Callers can instead use localtime_rz + strftime. +*/ + +#endif + +/* +** The easy way to behave "as if no library function calls" localtime +** is to not call it, so we drop its guts into "localsub", which can be +** freely called. (And no, the PANS doesn't require the above behavior, +** but it *is* desirable.) +** +** If successful and SETNAME is nonzero, +** set the applicable parts of tzname, timezone and altzone; +** however, it's OK to omit this step if the timezone is POSIX-compatible, +** since in that case tzset should have already done this step correctly. +** SETNAME's type is intfast32_t for compatibility with gmtsub, +** but it is actually a boolean and its value should be 0 or 1. +*/ + +/*ARGSUSED*/ +static struct tm * +localsub(struct state const *sp, time_t const *timep, int_fast32_t setname, + struct tm *const tmp) +{ + const struct ttinfo * ttisp; + int i; + struct tm * result; + const time_t t = *timep; + + if (sp == NULL) { + /* Don't bother to set tzname etc.; tzset has already done it. */ + return gmtsub(gmtptr, timep, 0, tmp); + } + if ((sp->goback && t < sp->ats[0]) || + (sp->goahead && t > sp->ats[sp->timecnt - 1])) { + time_t newt = t; + time_t seconds; + time_t years; + + if (t < sp->ats[0]) + seconds = sp->ats[0] - t; + else seconds = t - sp->ats[sp->timecnt - 1]; + --seconds; + years = (time_t)((seconds / SECSPERREPEAT + 1) * YEARSPERREPEAT); + seconds = (time_t)(years * AVGSECSPERYEAR); + if (t < sp->ats[0]) + newt += seconds; + else newt -= seconds; + if (newt < sp->ats[0] || + newt > sp->ats[sp->timecnt - 1]) { + errno = EINVAL; + return NULL; /* "cannot happen" */ + } + result = localsub(sp, &newt, setname, tmp); + if (result) { + int_fast64_t newy; + + newy = result->tm_year; + if (t < sp->ats[0]) + newy -= years; + else newy += years; + if (! (INT_MIN <= newy && newy <= INT_MAX)) { + errno = EOVERFLOW; + return NULL; + } + result->tm_year = (int)newy; + } + return result; + } + if (sp->timecnt == 0 || t < sp->ats[0]) { + i = sp->defaulttype; + } else { + int lo = 1; + int hi = sp->timecnt; + + while (lo < hi) { + int mid = (lo + hi) / 2; + + if (t < sp->ats[mid]) + hi = mid; + else lo = mid + 1; + } + i = (int) sp->types[lo - 1]; + } + ttisp = &sp->ttis[i]; + /* + ** To get (wrong) behavior that's compatible with System V Release 2.0 + ** you'd replace the statement below with + ** t += ttisp->tt_utoff; + ** timesub(&t, 0L, sp, tmp); + */ + result = timesub(&t, ttisp->tt_utoff, sp, tmp); + if (result) { + result->tm_isdst = ttisp->tt_isdst; +#ifdef TM_ZONE + result->TM_ZONE = __UNCONST(&sp->chars[ttisp->tt_desigidx]); +#endif /* defined TM_ZONE */ + if (setname) + update_tzname_etc(sp, ttisp); + } + return result; +} + +#if NETBSD_INSPIRED + +struct tm * +localtime_rz(timezone_t sp, time_t const *timep, struct tm *tmp) +{ + return localsub(sp, timep, 0, tmp); +} + +#endif + +static struct tm * +localtime_tzset(time_t const *timep, struct tm *tmp, bool setname) +{ + rwlock_wrlock(&__lcl_lock); + if (setname || !lcl_is_set) + tzset_unlocked(); + tmp = localsub(__lclptr, timep, setname, tmp); + rwlock_unlock(&__lcl_lock); + return tmp; +} + +struct tm * +localtime(const time_t *timep) +{ + return localtime_tzset(timep, &tm, true); +} + +struct tm * +localtime_r(const time_t * __restrict timep, struct tm *tmp) +{ + return localtime_tzset(timep, tmp, true); +} + +/* +** gmtsub is to gmtime as localsub is to localtime. +*/ + +static struct tm * +gmtsub(struct state const *sp, const time_t *timep, int_fast32_t offset, + struct tm *tmp) +{ + struct tm * result; + + result = timesub(timep, offset, gmtptr, tmp); +#ifdef TM_ZONE + /* + ** Could get fancy here and deliver something such as + ** "+xx" or "-xx" if offset is non-zero, + ** but this is no time for a treasure hunt. + */ + if (result) + result->TM_ZONE = offset ? __UNCONST(wildabbr) : gmtptr ? + gmtptr->chars : __UNCONST(gmt); +#endif /* defined TM_ZONE */ + return result; +} + + +/* +** Re-entrant version of gmtime. +*/ + +struct tm * +gmtime_r(const time_t *timep, struct tm *tmp) +{ + gmtcheck(); + return gmtsub(NULL, timep, 0, tmp); +} + +struct tm * +gmtime(const time_t *timep) +{ + return gmtime_r(timep, &tm); +} +#ifdef STD_INSPIRED + +struct tm * +offtime(const time_t *timep, long offset) +{ + gmtcheck(); + return gmtsub(gmtptr, timep, (int_fast32_t)offset, &tm); +} + +struct tm * +offtime_r(const time_t *timep, long offset, struct tm *tmp) +{ + gmtcheck(); + return gmtsub(NULL, timep, (int_fast32_t)offset, tmp); +} + +#endif /* defined STD_INSPIRED */ + +#if TZ_TIME_T + +# if USG_COMPAT +# define daylight 0 +# define timezone 0 +# endif +# ifndef ALTZONE +# define altzone 0 +# endif + +/* Convert from the underlying system's time_t to the ersatz time_tz, + which is called 'time_t' in this file. Typically, this merely + converts the time's integer width. On some platforms, the system + time is local time not UT, or uses some epoch other than the POSIX + epoch. + + Although this code appears to define a function named 'time' that + returns time_t, the macros in private.h cause this code to actually + define a function named 'tz_time' that returns tz_time_t. The call + to sys_time invokes the underlying system's 'time' function. */ + +time_t +time(time_t *p) +{ + time_t r = sys_time(0); + if (r != (time_t) -1) { + int_fast32_t offset = EPOCH_LOCAL ? (daylight ? timezone : altzone) : 0; + if (increment_overflow32(&offset, -EPOCH_OFFSET) + || increment_overflow_time (&r, offset)) { + errno = EOVERFLOW; + r = -1; + } + } + if (p) + *p = r; + return r; +} +#endif + +/* +** Return the number of leap years through the end of the given year +** where, to make the math easy, the answer for year zero is defined as zero. +*/ +static int +leaps_thru_end_of_nonneg(int y) +{ + return y / 4 - y / 100 + y / 400; +} + +static int ATTRIBUTE_PURE +leaps_thru_end_of(const int y) +{ + return (y < 0 + ? -1 - leaps_thru_end_of_nonneg(-1 - y) + : leaps_thru_end_of_nonneg(y)); +} + +static struct tm * +timesub(const time_t *timep, int_fast32_t offset, + const struct state *sp, struct tm *tmp) +{ + const struct lsinfo * lp; + time_t tdays; + int idays; /* unsigned would be so 2003 */ + int_fast64_t rem; + int y; + const int * ip; + int_fast64_t corr; + int hit; + int i; + + corr = 0; + hit = false; + i = (sp == NULL) ? 0 : sp->leapcnt; + while (--i >= 0) { + lp = &sp->lsis[i]; + if (*timep >= lp->ls_trans) { + corr = lp->ls_corr; + hit = (*timep == lp->ls_trans + && (i == 0 ? 0 : lp[-1].ls_corr) < corr); + break; + } + } + y = EPOCH_YEAR; + tdays = (time_t)(*timep / SECSPERDAY); + rem = *timep % SECSPERDAY; + while (tdays < 0 || tdays >= year_lengths[isleap(y)]) { + int newy; + time_t tdelta; + int idelta; + int leapdays; + + tdelta = tdays / DAYSPERLYEAR; + if (! ((! TYPE_SIGNED(time_t) || INT_MIN <= tdelta) + && tdelta <= INT_MAX)) + goto out_of_range; + _DIAGASSERT(__type_fit(int, tdelta)); + idelta = (int)tdelta; + if (idelta == 0) + idelta = (tdays < 0) ? -1 : 1; + newy = y; + if (increment_overflow(&newy, idelta)) + goto out_of_range; + leapdays = leaps_thru_end_of(newy - 1) - + leaps_thru_end_of(y - 1); + tdays -= ((time_t) newy - y) * DAYSPERNYEAR; + tdays -= leapdays; + y = newy; + } + /* + ** Given the range, we can now fearlessly cast... + */ + idays = (int) tdays; + rem += offset - corr; + while (rem < 0) { + rem += SECSPERDAY; + --idays; + } + while (rem >= SECSPERDAY) { + rem -= SECSPERDAY; + ++idays; + } + while (idays < 0) { + if (increment_overflow(&y, -1)) + goto out_of_range; + idays += year_lengths[isleap(y)]; + } + while (idays >= year_lengths[isleap(y)]) { + idays -= year_lengths[isleap(y)]; + if (increment_overflow(&y, 1)) + goto out_of_range; + } + tmp->tm_year = y; + if (increment_overflow(&tmp->tm_year, -TM_YEAR_BASE)) + goto out_of_range; + tmp->tm_yday = idays; + /* + ** The "extra" mods below avoid overflow problems. + */ + tmp->tm_wday = EPOCH_WDAY + + ((y - EPOCH_YEAR) % DAYSPERWEEK) * + (DAYSPERNYEAR % DAYSPERWEEK) + + leaps_thru_end_of(y - 1) - + leaps_thru_end_of(EPOCH_YEAR - 1) + + idays; + tmp->tm_wday %= DAYSPERWEEK; + if (tmp->tm_wday < 0) + tmp->tm_wday += DAYSPERWEEK; + tmp->tm_hour = (int) (rem / SECSPERHOUR); + rem %= SECSPERHOUR; + tmp->tm_min = (int) (rem / SECSPERMIN); + /* + ** A positive leap second requires a special + ** representation. This uses "... ??:59:60" et seq. + */ + tmp->tm_sec = (int) (rem % SECSPERMIN) + hit; + ip = mon_lengths[isleap(y)]; + for (tmp->tm_mon = 0; idays >= ip[tmp->tm_mon]; ++(tmp->tm_mon)) + idays -= ip[tmp->tm_mon]; + tmp->tm_mday = (int) (idays + 1); + tmp->tm_isdst = 0; +#ifdef TM_GMTOFF + tmp->TM_GMTOFF = offset; +#endif /* defined TM_GMTOFF */ + return tmp; +out_of_range: + errno = EOVERFLOW; + return NULL; +} + +char * +ctime(const time_t *timep) +{ +/* +** Section 4.12.3.2 of X3.159-1989 requires that +** The ctime function converts the calendar time pointed to by timer +** to local time in the form of a string. It is equivalent to +** asctime(localtime(timer)) +*/ + struct tm *tmp = localtime(timep); + return tmp ? asctime(tmp) : NULL; +} + +char * +ctime_r(const time_t *timep, char *buf) +{ + struct tm mytm; + struct tm *tmp = localtime_r(timep, &mytm); + return tmp ? asctime_r(tmp, buf) : NULL; +} + +char * +ctime_rz(const timezone_t sp, const time_t * timep, char *buf) +{ + struct tm mytm, *rtm; + + rtm = localtime_rz(sp, timep, &mytm); + if (rtm == NULL) + return NULL; + return asctime_r(rtm, buf); +} + +/* +** Adapted from code provided by Robert Elz, who writes: +** The "best" way to do mktime I think is based on an idea of Bob +** Kridle's (so its said...) from a long time ago. +** It does a binary search of the time_t space. Since time_t's are +** just 32 bits, its a max of 32 iterations (even at 64 bits it +** would still be very reasonable). +*/ + +#ifndef WRONG +#define WRONG ((time_t)-1) +#endif /* !defined WRONG */ + +/* +** Normalize logic courtesy Paul Eggert. +*/ + +static bool +increment_overflow(int *ip, int j) +{ + int const i = *ip; + + /* + ** If i >= 0 there can only be overflow if i + j > INT_MAX + ** or if j > INT_MAX - i; given i >= 0, INT_MAX - i cannot overflow. + ** If i < 0 there can only be overflow if i + j < INT_MIN + ** or if j < INT_MIN - i; given i < 0, INT_MIN - i cannot overflow. + */ + if ((i >= 0) ? (j > INT_MAX - i) : (j < INT_MIN - i)) + return true; + *ip += j; + return false; +} + +static bool +increment_overflow32(int_fast32_t *const lp, int const m) +{ + int_fast32_t const l = *lp; + + if ((l >= 0) ? (m > INT_FAST32_MAX - l) : (m < INT_FAST32_MIN - l)) + return true; + *lp += m; + return false; +} + +static bool +increment_overflow_time(time_t *tp, int_fast32_t j) +{ + /* + ** This is like + ** 'if (! (TIME_T_MIN <= *tp + j && *tp + j <= TIME_T_MAX)) ...', + ** except that it does the right thing even if *tp + j would overflow. + */ + if (! (j < 0 + ? (TYPE_SIGNED(time_t) ? TIME_T_MIN - j <= *tp : -1 - j < *tp) + : *tp <= TIME_T_MAX - j)) + return true; + *tp += j; + return false; +} + +static bool +normalize_overflow(int *const tensptr, int *const unitsptr, const int base) +{ + int tensdelta; + + tensdelta = (*unitsptr >= 0) ? + (*unitsptr / base) : + (-1 - (-1 - *unitsptr) / base); + *unitsptr -= tensdelta * base; + return increment_overflow(tensptr, tensdelta); +} + +static bool +normalize_overflow32(int_fast32_t *tensptr, int *unitsptr, int base) +{ + int tensdelta; + + tensdelta = (*unitsptr >= 0) ? + (*unitsptr / base) : + (-1 - (-1 - *unitsptr) / base); + *unitsptr -= tensdelta * base; + return increment_overflow32(tensptr, tensdelta); +} + +static int +tmcomp(const struct tm *const atmp, + const struct tm *const btmp) +{ + int result; + + if (atmp->tm_year != btmp->tm_year) + return atmp->tm_year < btmp->tm_year ? -1 : 1; + if ((result = (atmp->tm_mon - btmp->tm_mon)) == 0 && + (result = (atmp->tm_mday - btmp->tm_mday)) == 0 && + (result = (atmp->tm_hour - btmp->tm_hour)) == 0 && + (result = (atmp->tm_min - btmp->tm_min)) == 0) + result = atmp->tm_sec - btmp->tm_sec; + return result; +} + +static time_t +time2sub(struct tm *const tmp, + struct tm *(*funcp)(struct state const *, time_t const *, + int_fast32_t, struct tm *), + struct state const *sp, + const int_fast32_t offset, + bool *okayp, + bool do_norm_secs) +{ + int dir; + int i, j; + int saved_seconds; + int_fast32_t li; + time_t lo; + time_t hi; +#ifdef NO_ERROR_IN_DST_GAP + time_t ilo; +#endif + int_fast32_t y; + time_t newt; + time_t t; + struct tm yourtm, mytm; + + *okayp = false; + yourtm = *tmp; +#ifdef NO_ERROR_IN_DST_GAP +again: +#endif + if (do_norm_secs) { + if (normalize_overflow(&yourtm.tm_min, &yourtm.tm_sec, + SECSPERMIN)) + goto out_of_range; + } + if (normalize_overflow(&yourtm.tm_hour, &yourtm.tm_min, MINSPERHOUR)) + goto out_of_range; + if (normalize_overflow(&yourtm.tm_mday, &yourtm.tm_hour, HOURSPERDAY)) + goto out_of_range; + y = yourtm.tm_year; + if (normalize_overflow32(&y, &yourtm.tm_mon, MONSPERYEAR)) + goto out_of_range; + /* + ** Turn y into an actual year number for now. + ** It is converted back to an offset from TM_YEAR_BASE later. + */ + if (increment_overflow32(&y, TM_YEAR_BASE)) + goto out_of_range; + while (yourtm.tm_mday <= 0) { + if (increment_overflow32(&y, -1)) + goto out_of_range; + li = y + (1 < yourtm.tm_mon); + yourtm.tm_mday += year_lengths[isleap(li)]; + } + while (yourtm.tm_mday > DAYSPERLYEAR) { + li = y + (1 < yourtm.tm_mon); + yourtm.tm_mday -= year_lengths[isleap(li)]; + if (increment_overflow32(&y, 1)) + goto out_of_range; + } + for ( ; ; ) { + i = mon_lengths[isleap(y)][yourtm.tm_mon]; + if (yourtm.tm_mday <= i) + break; + yourtm.tm_mday -= i; + if (++yourtm.tm_mon >= MONSPERYEAR) { + yourtm.tm_mon = 0; + if (increment_overflow32(&y, 1)) + goto out_of_range; + } + } + if (increment_overflow32(&y, -TM_YEAR_BASE)) + goto out_of_range; + if (! (INT_MIN <= y && y <= INT_MAX)) + goto out_of_range; + yourtm.tm_year = (int)y; + if (yourtm.tm_sec >= 0 && yourtm.tm_sec < SECSPERMIN) + saved_seconds = 0; + else if (y + TM_YEAR_BASE < EPOCH_YEAR) { + /* + ** We can't set tm_sec to 0, because that might push the + ** time below the minimum representable time. + ** Set tm_sec to 59 instead. + ** This assumes that the minimum representable time is + ** not in the same minute that a leap second was deleted from, + ** which is a safer assumption than using 58 would be. + */ + if (increment_overflow(&yourtm.tm_sec, 1 - SECSPERMIN)) + goto out_of_range; + saved_seconds = yourtm.tm_sec; + yourtm.tm_sec = SECSPERMIN - 1; + } else { + saved_seconds = yourtm.tm_sec; + yourtm.tm_sec = 0; + } + /* + ** Do a binary search (this works whatever time_t's type is). + */ + lo = TIME_T_MIN; + hi = TIME_T_MAX; +#ifdef NO_ERROR_IN_DST_GAP + ilo = lo; +#endif + for ( ; ; ) { + t = lo / 2 + hi / 2; + if (t < lo) + t = lo; + else if (t > hi) + t = hi; + if (! funcp(sp, &t, offset, &mytm)) { + /* + ** Assume that t is too extreme to be represented in + ** a struct tm; arrange things so that it is less + ** extreme on the next pass. + */ + dir = (t > 0) ? 1 : -1; + } else dir = tmcomp(&mytm, &yourtm); + if (dir != 0) { + if (t == lo) { + if (t == TIME_T_MAX) + goto out_of_range; + ++t; + ++lo; + } else if (t == hi) { + if (t == TIME_T_MIN) + goto out_of_range; + --t; + --hi; + } +#ifdef NO_ERROR_IN_DST_GAP + if (ilo != lo && lo - 1 == hi && yourtm.tm_isdst < 0 && + do_norm_secs) { + for (i = sp->typecnt - 1; i >= 0; --i) { + for (j = sp->typecnt - 1; j >= 0; --j) { + time_t off; + if (sp->ttis[j].tt_isdst == + sp->ttis[i].tt_isdst) + continue; + off = sp->ttis[j].tt_utoff - + sp->ttis[i].tt_utoff; + yourtm.tm_sec += off < 0 ? + -off : off; + goto again; + } + } + } +#endif + if (lo > hi) + goto invalid; + if (dir > 0) + hi = t; + else lo = t; + continue; + } +#if defined TM_GMTOFF && ! UNINIT_TRAP + if (mytm.TM_GMTOFF != yourtm.TM_GMTOFF + && (yourtm.TM_GMTOFF < 0 + ? (-SECSPERDAY <= yourtm.TM_GMTOFF + && (mytm.TM_GMTOFF <= + (/*CONSTCOND*/SMALLEST (INT_FAST32_MAX, LONG_MAX) + + yourtm.TM_GMTOFF))) + : (yourtm.TM_GMTOFF <= SECSPERDAY + && ((/*CONSTCOND*/BIGGEST (INT_FAST32_MIN, LONG_MIN) + + yourtm.TM_GMTOFF) + <= mytm.TM_GMTOFF)))) { + /* MYTM matches YOURTM except with the wrong UT offset. + YOURTM.TM_GMTOFF is plausible, so try it instead. + It's OK if YOURTM.TM_GMTOFF contains uninitialized data, + since the guess gets checked. */ + time_t altt = t; + int_fast32_t diff = (int_fast32_t) + (mytm.TM_GMTOFF - yourtm.TM_GMTOFF); + if (!increment_overflow_time(&altt, diff)) { + struct tm alttm; + if (! funcp(sp, &altt, offset, &alttm) + && alttm.tm_isdst == mytm.tm_isdst + && alttm.TM_GMTOFF == yourtm.TM_GMTOFF + && tmcomp(&alttm, &yourtm)) { + t = altt; + mytm = alttm; + } + } + } +#endif + if (yourtm.tm_isdst < 0 || mytm.tm_isdst == yourtm.tm_isdst) + break; + /* + ** Right time, wrong type. + ** Hunt for right time, right type. + ** It's okay to guess wrong since the guess + ** gets checked. + */ + if (sp == NULL) + goto invalid; + for (i = sp->typecnt - 1; i >= 0; --i) { + if (sp->ttis[i].tt_isdst != yourtm.tm_isdst) + continue; + for (j = sp->typecnt - 1; j >= 0; --j) { + if (sp->ttis[j].tt_isdst == yourtm.tm_isdst) + continue; + newt = (time_t)(t + sp->ttis[j].tt_utoff - + sp->ttis[i].tt_utoff); + if (! funcp(sp, &newt, offset, &mytm)) + continue; + if (tmcomp(&mytm, &yourtm) != 0) + continue; + if (mytm.tm_isdst != yourtm.tm_isdst) + continue; + /* + ** We have a match. + */ + t = newt; + goto label; + } + } + goto invalid; + } +label: + newt = t + saved_seconds; + if ((newt < t) != (saved_seconds < 0)) + goto out_of_range; + t = newt; + if (funcp(sp, &t, offset, tmp)) { + *okayp = true; + return t; + } +out_of_range: + errno = EOVERFLOW; + return WRONG; +invalid: + errno = EINVAL; + return WRONG; +} + +static time_t +time2(struct tm * const tmp, + struct tm *(*funcp)(struct state const *, time_t const *, + int_fast32_t, struct tm *), + struct state const *sp, + const int_fast32_t offset, + bool *okayp) +{ + time_t t; + + /* + ** First try without normalization of seconds + ** (in case tm_sec contains a value associated with a leap second). + ** If that fails, try with normalization of seconds. + */ + t = time2sub(tmp, funcp, sp, offset, okayp, false); + return *okayp ? t : time2sub(tmp, funcp, sp, offset, okayp, true); +} + +static time_t +time1(struct tm *const tmp, + struct tm *(*funcp) (struct state const *, time_t const *, + int_fast32_t, struct tm *), + struct state const *sp, + const int_fast32_t offset) +{ + time_t t; + int samei, otheri; + int sameind, otherind; + int i; + int nseen; + int save_errno; + char seen[TZ_MAX_TYPES]; + unsigned char types[TZ_MAX_TYPES]; + bool okay; + + if (tmp == NULL) { + errno = EINVAL; + return WRONG; + } + if (tmp->tm_isdst > 1) + tmp->tm_isdst = 1; + save_errno = errno; + t = time2(tmp, funcp, sp, offset, &okay); + if (okay) { + errno = save_errno; + return t; + } + if (tmp->tm_isdst < 0) +#ifdef PCTS + /* + ** POSIX Conformance Test Suite code courtesy Grant Sullivan. + */ + tmp->tm_isdst = 0; /* reset to std and try again */ +#else + return t; +#endif /* !defined PCTS */ + /* + ** We're supposed to assume that somebody took a time of one type + ** and did some math on it that yielded a "struct tm" that's bad. + ** We try to divine the type they started from and adjust to the + ** type they need. + */ + if (sp == NULL) { + errno = EINVAL; + return WRONG; + } + for (i = 0; i < sp->typecnt; ++i) + seen[i] = false; + nseen = 0; + for (i = sp->timecnt - 1; i >= 0; --i) + if (!seen[sp->types[i]]) { + seen[sp->types[i]] = true; + types[nseen++] = sp->types[i]; + } + for (sameind = 0; sameind < nseen; ++sameind) { + samei = types[sameind]; + if (sp->ttis[samei].tt_isdst != tmp->tm_isdst) + continue; + for (otherind = 0; otherind < nseen; ++otherind) { + otheri = types[otherind]; + if (sp->ttis[otheri].tt_isdst == tmp->tm_isdst) + continue; + tmp->tm_sec += (int)(sp->ttis[otheri].tt_utoff - + sp->ttis[samei].tt_utoff); + tmp->tm_isdst = !tmp->tm_isdst; + t = time2(tmp, funcp, sp, offset, &okay); + if (okay) { + errno = save_errno; + return t; + } + tmp->tm_sec -= (int)(sp->ttis[otheri].tt_utoff - + sp->ttis[samei].tt_utoff); + tmp->tm_isdst = !tmp->tm_isdst; + } + } + errno = EOVERFLOW; + return WRONG; +} + +static time_t +mktime_tzname(timezone_t sp, struct tm *tmp, bool setname) +{ + if (sp) + return time1(tmp, localsub, sp, setname); + else { + gmtcheck(); + return time1(tmp, gmtsub, gmtptr, 0); + } +} + +#if NETBSD_INSPIRED + +time_t +mktime_z(timezone_t sp, struct tm *const tmp) +{ + return mktime_tzname(sp, tmp, false); +} + +#endif + +time_t +mktime(struct tm *tmp) +{ + time_t t; + + rwlock_wrlock(&__lcl_lock); + tzset_unlocked(); + t = mktime_tzname(__lclptr, tmp, true); + rwlock_unlock(&__lcl_lock); + return t; +} + +#ifdef STD_INSPIRED + +time_t +timelocal_z(const timezone_t sp, struct tm *const tmp) +{ + if (tmp != NULL) + tmp->tm_isdst = -1; /* in case it wasn't initialized */ + return mktime_z(sp, tmp); +} + +time_t +timelocal(struct tm *tmp) +{ + if (tmp != NULL) + tmp->tm_isdst = -1; /* in case it wasn't initialized */ + return mktime(tmp); +} + +time_t +timegm(struct tm *tmp) +{ + + return timeoff(tmp, 0); +} + +time_t +timeoff(struct tm *tmp, long offset) +{ + if (tmp) + tmp->tm_isdst = 0; + gmtcheck(); + return time1(tmp, gmtsub, gmtptr, (int_fast32_t)offset); +} + +#endif /* defined STD_INSPIRED */ + +/* +** XXX--is the below the right way to conditionalize?? +*/ + +#ifdef STD_INSPIRED + +/* +** IEEE Std 1003.1 (POSIX) says that 536457599 +** shall correspond to "Wed Dec 31 23:59:59 UTC 1986", which +** is not the case if we are accounting for leap seconds. +** So, we provide the following conversion routines for use +** when exchanging timestamps with POSIX conforming systems. +*/ + +static int_fast64_t +leapcorr(const timezone_t sp, time_t t) +{ + struct lsinfo const * lp; + int i; + + i = sp->leapcnt; + while (--i >= 0) { + lp = &sp->lsis[i]; + if (t >= lp->ls_trans) + return lp->ls_corr; + } + return 0; +} + +NETBSD_INSPIRED_EXTERN time_t +time2posix_z(timezone_t sp, time_t t) +{ + return (time_t)(t - leapcorr(sp, t)); +} + +time_t +time2posix(time_t t) +{ + rwlock_wrlock(&__lcl_lock); + if (!lcl_is_set) + tzset_unlocked(); + if (__lclptr) + t = (time_t)(t - leapcorr(__lclptr, t)); + rwlock_unlock(&__lcl_lock); + return t; +} + +NETBSD_INSPIRED_EXTERN time_t +posix2time_z(timezone_t sp, time_t t) +{ + time_t x; + time_t y; + + /* + ** For a positive leap second hit, the result + ** is not unique. For a negative leap second + ** hit, the corresponding time doesn't exist, + ** so we return an adjacent second. + */ + x = (time_t)(t + leapcorr(sp, t)); + y = (time_t)(x - leapcorr(sp, x)); + if (y < t) { + do { + x++; + y = (time_t)(x - leapcorr(sp, x)); + } while (y < t); + x -= y != t; + } else if (y > t) { + do { + --x; + y = (time_t)(x - leapcorr(sp, x)); + } while (y > t); + x += y != t; + } + return x; +} + +time_t +posix2time(time_t t) +{ + rwlock_wrlock(&__lcl_lock); + if (!lcl_is_set) + tzset_unlocked(); + if (__lclptr) + t = posix2time_z(__lclptr, t); + rwlock_unlock(&__lcl_lock); + return t; +} + +#endif /* defined STD_INSPIRED */ -- 2.21.0