* 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.
*
* IDENTIFICATION
* src/common/timezone/strftime.cpp
*/
#include "postgres.h"
#include "knl/knl_variable.h"
#include <fcntl.h>
#include <locale.h>
#include "private.h"
#include "tzfile.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"},
"%H:%M:%S",
* x_fmt
*
* C99 requires this format. Using just numbers (as here) makes Quakers
* happier; it's also compatible with SVR4.
*/
"%m/%d/%y",
* c_fmt
*
* C99 requires 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",
"PM",
"%a %b %e %H:%M:%S %Z %Y"};
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*, int*);
static char* _yconv(const int, const int, const int, const int, char*, const char* const);
#define IN_NONE 0
#define IN_SOME 1
#define IN_THIS 2
#define IN_ALL 3
size_t pg_strftime(char* s, size_t maxsize, const char* format, const struct pg_tm* t)
{
char* p = NULL;
int warn;
warn = IN_NONE;
p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn);
if (p == s + maxsize) {
return 0;
}
*p = '\0';
return p - s;
}
static char* _fmt(const char* format, const struct pg_tm* t, char* pt, const char* 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->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, 1, 0, pt, ptlim);
continue;
case 'c': {
int 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':
* 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("%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
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':
case 'G':
case 'g':
* 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;
}
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("%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': {
int 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, 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_zone != NULL) {
pt = _add(t->tm_zone, 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 = NULL;
if (t->tm_isdst < 0) {
continue;
}
diff = t->tm_gmtoff;
if (diff < 0) {
sign = "-";
diff = -diff;
} else {
sign = "+";
}
pt = _add(sign, pt, ptlim);
diff /= 60;
pt = _conv((diff / 60) * 100 + diff % 60, "%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];
(void)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(
const int a, const int b, const int convert_top, const int convert_yy, char* pt, const char* const 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;
}