Adding upstream version 14.5.upstream/14.5upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 571 insertions, 0 deletions

diff --git a/src/timezone/strftime.c b/src/timezone/strftime.c
new file mode 100644
index 0000000..dd6c7db
--- /dev/null
+++ b/src/timezone/strftime.c
@@ -0,0 +1,571 @@
+/* Convert a broken-down timestamp to a string.  */
+
+/*
+ * Copyright 1989 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. 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.
+ */
+
+/*
+ * Based on the UCB version with the copyright notice appearing above.
+ *
+ * This is ANSIish only when "multibyte character == plain character".
+ *
+ * IDENTIFICATION
+ *	  src/timezone/strftime.c
+ */
+
+#include "postgres.h"
+
+#include <fcntl.h>
+
+#include "private.h"
+
+
+struct lc_time_T
+{
+	const char *mon[MONSPERYEAR];
+	const char *month[MONSPERYEAR];
+	const char *wday[DAYSPERWEEK];
+	const char *weekday[DAYSPERWEEK];
+	const char *X_fmt;
+	const char *x_fmt;
+	const char *c_fmt;
+	const char *am;
+	const char *pm;
+	const char *date_fmt;
+};
+
+#define Locale	(&C_time_locale)
+
+static const struct lc_time_T C_time_locale = {
+	{
+		"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+	}, {
+		"January", "February", "March", "April", "May", "June",
+		"July", "August", "September", "October", "November", "December"
+	}, {
+		"Sun", "Mon", "Tue", "Wed",
+		"Thu", "Fri", "Sat"
+	}, {
+		"Sunday", "Monday", "Tuesday", "Wednesday",
+		"Thursday", "Friday", "Saturday"
+	},
+
+	/* X_fmt */
+	"%H:%M:%S",
+
+	/*
+	 * x_fmt
+	 *
+	 * C99 and later require this format. Using just numbers (as here) makes
+	 * Quakers happier; it's also compatible with SVR4.
+	 */
+	"%m/%d/%y",
+
+	/*
+	 * c_fmt
+	 *
+	 * C99 and later require this format. Previously this code used "%D %X",
+	 * but we now conform to C99. Note that "%a %b %d %H:%M:%S %Y" is used by
+	 * Solaris 2.3.
+	 */
+	"%a %b %e %T %Y",
+
+	/* am */
+	"AM",
+
+	/* pm */
+	"PM",
+
+	/* date_fmt */
+	"%a %b %e %H:%M:%S %Z %Y"
+};
+
+enum warn
+{
+	IN_NONE, IN_SOME, IN_THIS, IN_ALL
+};
+
+static char *_add(const char *, char *, const char *);
+static char *_conv(int, const char *, char *, const char *);
+static char *_fmt(const char *, const struct pg_tm *, char *, const char *,
+				  enum warn *);
+static char *_yconv(int, int, bool, bool, char *, char const *);
+
+
+/*
+ * Convert timestamp t to string s, a caller-allocated buffer of size maxsize,
+ * using the given format pattern.
+ *
+ * See also timestamptz_to_str.
+ */
+size_t
+pg_strftime(char *s, size_t maxsize, const char *format, const struct pg_tm *t)
+{
+	char	   *p;
+	int			saved_errno = errno;
+	enum warn	warn = IN_NONE;
+
+	p = _fmt(format, t, s, s + maxsize, &warn);
+	if (!p)
+	{
+		errno = EOVERFLOW;
+		return 0;
+	}
+	if (p == s + maxsize)
+	{
+		errno = ERANGE;
+		return 0;
+	}
+	*p = '\0';
+	errno = saved_errno;
+	return p - s;
+}
+
+static char *
+_fmt(const char *format, const struct pg_tm *t, char *pt,
+	 const char *ptlim, enum warn *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->weekday[t->tm_wday],
+							  pt, ptlim);
+					continue;
+				case 'a':
+					pt = _add((t->tm_wday < 0 ||
+							   t->tm_wday >= DAYSPERWEEK) ?
+							  "?" : Locale->wday[t->tm_wday],
+							  pt, ptlim);
+					continue;
+				case 'B':
+					pt = _add((t->tm_mon < 0 ||
+							   t->tm_mon >= MONSPERYEAR) ?
+							  "?" : Locale->month[t->tm_mon],
+							  pt, ptlim);
+					continue;
+				case 'b':
+				case 'h':
+					pt = _add((t->tm_mon < 0 ||
+							   t->tm_mon >= MONSPERYEAR) ?
+							  "?" : Locale->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,
+								true, false, pt, ptlim);
+					continue;
+				case 'c':
+					{
+						enum warn	warn2 = IN_SOME;
+
+						pt = _fmt(Locale->c_fmt, t, pt, ptlim, &warn2);
+						if (warn2 == IN_ALL)
+							warn2 = IN_THIS;
+						if (warn2 > *warnp)
+							*warnp = warn2;
+					}
+					continue;
+				case 'D':
+					pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp);
+					continue;
+				case 'd':
+					pt = _conv(t->tm_mday, "%02d", pt, ptlim);
+					continue;
+				case 'E':
+				case 'O':
+
+					/*
+					 * Locale modifiers of C99 and later. 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 alternative
+					 * representations.
+					 */
+					goto label;
+				case 'e':
+					pt = _conv(t->tm_mday, "%2d", pt, ptlim);
+					continue;
+				case 'F':
+					pt = _fmt("%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->pm :
+							  Locale->am,
+							  pt, ptlim);
+					continue;
+				case 'R':
+					pt = _fmt("%H:%M", t, pt, ptlim, warnp);
+					continue;
+				case 'r':
+					pt = _fmt("%I:%M:%S %p", t, pt, ptlim, warnp);
+					continue;
+				case 'S':
+					pt = _conv(t->tm_sec, "%02d", pt, ptlim);
+					continue;
+				case 'T':
+					pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp);
+					continue;
+				case 't':
+					pt = _add("\t", pt, ptlim);
+					continue;
+				case 'U':
+					pt = _conv((t->tm_yday + DAYSPERWEEK -
+								t->tm_wday) / DAYSPERWEEK,
+							   "%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 <https://www.cl.cam.ac.uk/~mgk25/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;
+						}
+						if (*format == 'V')
+							pt = _conv(w, "%02d",
+									   pt, ptlim);
+						else if (*format == 'g')
+						{
+							*warnp = IN_ALL;
+							pt = _yconv(year, base,
+										false, true,
+										pt, ptlim);
+						}
+						else
+							pt = _yconv(year, base,
+										true, true,
+										pt, ptlim);
+					}
+					continue;
+				case 'v':
+
+					/*
+					 * From Arnold Robbins' strftime version 3.0: "date as
+					 * dd-bbb-YYYY" (ado, 1993-05-24)
+					 */
+					pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp);
+					continue;
+				case 'W':
+					pt = _conv((t->tm_yday + DAYSPERWEEK -
+								(t->tm_wday ?
+								 (t->tm_wday - 1) :
+								 (DAYSPERWEEK - 1))) / DAYSPERWEEK,
+							   "%02d", pt, ptlim);
+					continue;
+				case 'w':
+					pt = _conv(t->tm_wday, "%d", pt, ptlim);
+					continue;
+				case 'X':
+					pt = _fmt(Locale->X_fmt, t, pt, ptlim, warnp);
+					continue;
+				case 'x':
+					{
+						enum warn	warn2 = IN_SOME;
+
+						pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2);
+						if (warn2 == IN_ALL)
+							warn2 = IN_THIS;
+						if (warn2 > *warnp)
+							*warnp = warn2;
+					}
+					continue;
+				case 'y':
+					*warnp = IN_ALL;
+					pt = _yconv(t->tm_year, TM_YEAR_BASE,
+								false, true,
+								pt, ptlim);
+					continue;
+				case 'Y':
+					pt = _yconv(t->tm_year, TM_YEAR_BASE,
+								true, true,
+								pt, ptlim);
+					continue;
+				case 'Z':
+					if (t->tm_zone != NULL)
+						pt = _add(t->tm_zone, pt, ptlim);
+
+					/*
+					 * C99 and later say that %Z must be replaced by the empty
+					 * string if the time zone abbreviation is not
+					 * determinable.
+					 */
+					continue;
+				case 'z':
+					{
+						long		diff;
+						char const *sign;
+						bool		negative;
+
+						if (t->tm_isdst < 0)
+							continue;
+						diff = t->tm_gmtoff;
+						negative = diff < 0;
+						if (diff == 0)
+						{
+							if (t->tm_zone != NULL)
+								negative = t->tm_zone[0] == '-';
+						}
+						if (negative)
+						{
+							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;
+				case '+':
+					pt = _fmt(Locale->date_fmt, t, pt, ptlim,
+							  warnp);
+					continue;
+				case '%':
+
+					/*
+					 * X311J/88-090 (4.12.3.5): if conversion char is
+					 * undefined, behavior is undefined. Print out the
+					 * character itself as printf(3) also does.
+					 */
+				default:
+					break;
+			}
+		}
+		if (pt == ptlim)
+			break;
+		*pt++ = *format;
+	}
+	return pt;
+}
+
+static char *
+_conv(int n, const char *format, char *pt, const char *ptlim)
+{
+	char		buf[INT_STRLEN_MAXIMUM(int) + 1];
+
+	sprintf(buf, format, n);
+	return _add(buf, pt, ptlim);
+}
+
+static char *
+_add(const char *str, char *pt, const char *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(int a, int b, bool convert_top, bool convert_yy,
+	   char *pt, const char *ptlim)
+{
+	int			lead;
+	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;
+}