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Integrate src/timezone library for all platforms. There is more we can
and should do now that we control our own destiny for timezone handling, but this commit gets the bulk of the picayune diffs in place. Magnus Hagander and Tom Lane.
This commit is contained in:
Tom Lane
480
src/timezone/strftime.c
Normal file
480
src/timezone/strftime.c
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@ -0,0 +1,480 @@
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/*
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** Copyright (c) 1989 The Regents of the University of California.
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** All rights reserved.
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**
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** Redistribution and use in source and binary forms are permitted
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** provided that the above copyright notice and this paragraph are
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** duplicated in all such forms and that any documentation,
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** advertising materials, and other materials related to such
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** distribution and use acknowledge that the software was developed
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** by the University of California, Berkeley. The name of the
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** University may not be used to endorse or promote products derived
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** from this software without specific prior written permission.
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** THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#include "postgres.h"
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#include <fcntl.h>
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#include <locale.h>
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#include "pgtz.h"
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#include "private.h"
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#include "tzfile.h"
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struct lc_time_T {
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const char * mon[MONSPERYEAR];
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const char * month[MONSPERYEAR];
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const char * wday[DAYSPERWEEK];
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const char * weekday[DAYSPERWEEK];
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const char * X_fmt;
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const char * x_fmt;
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const char * c_fmt;
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const char * am;
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const char * pm;
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const char * date_fmt;
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};
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#define Locale (&C_time_locale)
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static const struct lc_time_T C_time_locale = {
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{
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"Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
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}, {
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"January", "February", "March", "April", "May", "June",
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"July", "August", "September", "October", "November", "December"
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}, {
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"Sun", "Mon", "Tue", "Wed",
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"Thu", "Fri", "Sat"
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}, {
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"Sunday", "Monday", "Tuesday", "Wednesday",
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"Thursday", "Friday", "Saturday"
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},
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/* X_fmt */
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"%H:%M:%S",
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/*
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** x_fmt
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** C99 requires this format.
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** Using just numbers (as here) makes Quakers happier;
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** it's also compatible with SVR4.
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*/
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"%m/%d/%y",
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/*
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** c_fmt
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** C99 requires this format.
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** Previously this code used "%D %X", but we now conform to C99.
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** Note that
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** "%a %b %d %H:%M:%S %Y"
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** is used by Solaris 2.3.
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*/
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"%a %b %e %T %Y",
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/* am */
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"AM",
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/* pm */
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"PM",
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/* date_fmt */
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"%a %b %e %H:%M:%S %Z %Y"
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};
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static char * _add (const char *, char *, const char *);
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static char * _conv (int, const char *, char *, const char *);
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static char * _fmt (const char *, const struct pg_tm *, char *, const char *, int *);
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#define IN_NONE 0
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#define IN_SOME 1
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#define IN_THIS 2
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#define IN_ALL 3
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size_t pg_strftime(char *s, size_t maxsize, const char *format, const struct pg_tm *t)
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{
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char * p;
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int warn;
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warn = IN_NONE;
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p = _fmt(((format == NULL) ? "%c" : format), t, s, s + maxsize, &warn);
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if (p == s + maxsize)
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return 0;
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*p = '\0';
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return p - s;
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}
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static char * _fmt(const char *format, const struct pg_tm *t, char *pt, const char *ptlim, int *warnp)
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{
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for ( ; *format; ++format) {
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if (*format == '%') {
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label:
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switch (*++format) {
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case '\0':
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--format;
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break;
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case 'A':
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pt = _add((t->tm_wday < 0 ||
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t->tm_wday >= DAYSPERWEEK) ?
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"?" : Locale->weekday[t->tm_wday],
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pt, ptlim);
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continue;
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case 'a':
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pt = _add((t->tm_wday < 0 ||
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t->tm_wday >= DAYSPERWEEK) ?
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"?" : Locale->wday[t->tm_wday],
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pt, ptlim);
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continue;
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case 'B':
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pt = _add((t->tm_mon < 0 ||
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t->tm_mon >= MONSPERYEAR) ?
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"?" : Locale->month[t->tm_mon],
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pt, ptlim);
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continue;
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case 'b':
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case 'h':
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pt = _add((t->tm_mon < 0 ||
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t->tm_mon >= MONSPERYEAR) ?
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"?" : Locale->mon[t->tm_mon],
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pt, ptlim);
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continue;
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case 'C':
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/*
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** %C used to do a...
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** _fmt("%a %b %e %X %Y", t);
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** ...whereas now POSIX 1003.2 calls for
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** something completely different.
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** (ado, 1993-05-24)
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*/
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pt = _conv((t->tm_year + TM_YEAR_BASE) / 100,
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"%02d", pt, ptlim);
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continue;
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case 'c':
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{
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int warn2 = IN_SOME;
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pt = _fmt(Locale->c_fmt, t, pt, ptlim, warnp);
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if (warn2 == IN_ALL)
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warn2 = IN_THIS;
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if (warn2 > *warnp)
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*warnp = warn2;
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}
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continue;
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case 'D':
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pt = _fmt("%m/%d/%y", t, pt, ptlim, warnp);
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continue;
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case 'd':
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pt = _conv(t->tm_mday, "%02d", pt, ptlim);
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continue;
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case 'E':
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case 'O':
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/*
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** C99 locale modifiers.
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** The sequences
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** %Ec %EC %Ex %EX %Ey %EY
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** %Od %oe %OH %OI %Om %OM
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** %OS %Ou %OU %OV %Ow %OW %Oy
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** are supposed to provide alternate
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** representations.
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*/
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goto label;
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case 'e':
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pt = _conv(t->tm_mday, "%2d", pt, ptlim);
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continue;
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case 'F':
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pt = _fmt("%Y-%m-%d", t, pt, ptlim, warnp);
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continue;
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case 'H':
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pt = _conv(t->tm_hour, "%02d", pt, ptlim);
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continue;
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case 'I':
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pt = _conv((t->tm_hour % 12) ?
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(t->tm_hour % 12) : 12,
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"%02d", pt, ptlim);
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continue;
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case 'j':
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pt = _conv(t->tm_yday + 1, "%03d", pt, ptlim);
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continue;
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case 'k':
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/*
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** This used to be...
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** _conv(t->tm_hour % 12 ?
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** t->tm_hour % 12 : 12, 2, ' ');
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** ...and has been changed to the below to
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** match SunOS 4.1.1 and Arnold Robbins'
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** strftime version 3.0. That is, "%k" and
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** "%l" have been swapped.
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** (ado, 1993-05-24)
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*/
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pt = _conv(t->tm_hour, "%2d", pt, ptlim);
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continue;
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#ifdef KITCHEN_SINK
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case 'K':
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/*
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** After all this time, still unclaimed!
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*/
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pt = _add("kitchen sink", pt, ptlim);
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continue;
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#endif /* defined KITCHEN_SINK */
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case 'l':
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/*
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** This used to be...
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** _conv(t->tm_hour, 2, ' ');
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** ...and has been changed to the below to
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** match SunOS 4.1.1 and Arnold Robbin's
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** strftime version 3.0. That is, "%k" and
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** "%l" have been swapped.
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** (ado, 1993-05-24)
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*/
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pt = _conv((t->tm_hour % 12) ?
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(t->tm_hour % 12) : 12,
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"%2d", pt, ptlim);
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continue;
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case 'M':
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pt = _conv(t->tm_min, "%02d", pt, ptlim);
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continue;
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case 'm':
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pt = _conv(t->tm_mon + 1, "%02d", pt, ptlim);
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continue;
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case 'n':
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pt = _add("\n", pt, ptlim);
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continue;
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case 'p':
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pt = _add((t->tm_hour >= (HOURSPERDAY / 2)) ?
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Locale->pm :
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Locale->am,
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pt, ptlim);
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continue;
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case 'R':
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pt = _fmt("%H:%M", t, pt, ptlim, warnp);
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continue;
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case 'r':
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pt = _fmt("%I:%M:%S %p", t, pt, ptlim, warnp);
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continue;
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case 'S':
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pt = _conv(t->tm_sec, "%02d", pt, ptlim);
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continue;
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case 's':
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{
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struct pg_tm tm;
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char buf[INT_STRLEN_MAXIMUM(time_t) + 1];
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time_t mkt;
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tm = *t;
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mkt = pg_mktime(&tm);
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if (TYPE_SIGNED(time_t))
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(void) sprintf(buf, "%ld", (long) mkt);
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else
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(void) sprintf(buf, "%lu", (unsigned long) mkt);
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pt = _add(buf, pt, ptlim);
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}
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continue;
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case 'T':
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pt = _fmt("%H:%M:%S", t, pt, ptlim, warnp);
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continue;
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case 't':
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pt = _add("\t", pt, ptlim);
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continue;
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case 'U':
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pt = _conv((t->tm_yday + DAYSPERWEEK -
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t->tm_wday) / DAYSPERWEEK,
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"%02d", pt, ptlim);
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continue;
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case 'u':
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/*
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** From Arnold Robbins' strftime version 3.0:
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** "ISO 8601: Weekday as a decimal number
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** [1 (Monday) - 7]"
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** (ado, 1993-05-24)
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*/
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pt = _conv((t->tm_wday == 0) ?
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DAYSPERWEEK : t->tm_wday,
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"%d", pt, ptlim);
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continue;
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case 'V': /* ISO 8601 week number */
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case 'G': /* ISO 8601 year (four digits) */
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case 'g': /* ISO 8601 year (two digits) */
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/*
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** From Arnold Robbins' strftime version 3.0: "the week number of the
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** year (the first Monday as the first day of week 1) as a decimal number
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** (01-53)."
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** (ado, 1993-05-24)
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**
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** From "http://www.ft.uni-erlangen.de/~mskuhn/iso-time.html" by Markus Kuhn:
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** "Week 01 of a year is per definition the first week which has the
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** Thursday in this year, which is equivalent to the week which contains
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** the fourth day of January. In other words, the first week of a new year
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** is the week which has the majority of its days in the new year. Week 01
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** might also contain days from the previous year and the week before week
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** 01 of a year is the last week (52 or 53) of the previous year even if
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** it contains days from the new year. A week starts with Monday (day 1)
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** and ends with Sunday (day 7). For example, the first week of the year
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** 1997 lasts from 1996-12-30 to 1997-01-05..."
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** (ado, 1996-01-02)
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*/
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{
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int year;
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int yday;
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int wday;
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int w;
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year = t->tm_year + TM_YEAR_BASE;
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yday = t->tm_yday;
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wday = t->tm_wday;
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for ( ; ; ) {
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int len;
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int bot;
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int top;
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len = isleap(year) ?
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DAYSPERLYEAR :
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DAYSPERNYEAR;
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/*
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** What yday (-3 ... 3) does
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** the ISO year begin on?
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*/
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bot = ((yday + 11 - wday) %
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DAYSPERWEEK) - 3;
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/*
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** What yday does the NEXT
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** ISO year begin on?
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*/
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top = bot -
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(len % DAYSPERWEEK);
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if (top < -3)
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top += DAYSPERWEEK;
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top += len;
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if (yday >= top) {
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++year;
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w = 1;
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break;
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}
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if (yday >= bot) {
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w = 1 + ((yday - bot) /
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DAYSPERWEEK);
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break;
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}
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--year;
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yday += isleap(year) ?
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DAYSPERLYEAR :
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DAYSPERNYEAR;
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}
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if (*format == 'V')
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pt = _conv(w, "%02d",
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pt, ptlim);
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else if (*format == 'g') {
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*warnp = IN_ALL;
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pt = _conv(year % 100, "%02d",
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pt, ptlim);
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} else pt = _conv(year, "%04d",
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pt, ptlim);
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}
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continue;
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case 'v':
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/*
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** From Arnold Robbins' strftime version 3.0:
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** "date as dd-bbb-YYYY"
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** (ado, 1993-05-24)
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*/
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pt = _fmt("%e-%b-%Y", t, pt, ptlim, warnp);
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continue;
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case 'W':
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pt = _conv((t->tm_yday + DAYSPERWEEK -
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(t->tm_wday ?
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(t->tm_wday - 1) :
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(DAYSPERWEEK - 1))) / DAYSPERWEEK,
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"%02d", pt, ptlim);
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continue;
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case 'w':
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pt = _conv(t->tm_wday, "%d", pt, ptlim);
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continue;
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case 'X':
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pt = _fmt(Locale->X_fmt, t, pt, ptlim, warnp);
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continue;
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case 'x':
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{
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int warn2 = IN_SOME;
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pt = _fmt(Locale->x_fmt, t, pt, ptlim, &warn2);
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if (warn2 == IN_ALL)
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warn2 = IN_THIS;
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if (warn2 > *warnp)
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*warnp = warn2;
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}
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continue;
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case 'y':
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*warnp = IN_ALL;
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pt = _conv((t->tm_year + TM_YEAR_BASE) % 100,
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"%02d", pt, ptlim);
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continue;
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case 'Y':
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pt = _conv(t->tm_year + TM_YEAR_BASE, "%04d",
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pt, ptlim);
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continue;
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case 'Z':
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if (t->tm_zone != NULL)
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pt = _add(t->tm_zone, pt, ptlim);
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/*
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** C99 says that %Z must be replaced by the
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** empty string if the time zone is not
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** determinable.
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*/
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continue;
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case 'z':
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{
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int diff;
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char const * sign;
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if (t->tm_isdst < 0)
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continue;
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diff = t->tm_gmtoff;
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if (diff < 0) {
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sign = "-";
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diff = -diff;
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} else sign = "+";
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pt = _add(sign, pt, ptlim);
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diff /= 60;
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pt = _conv((diff/60)*100 + diff%60,
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"%04d", pt, ptlim);
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}
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continue;
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case '+':
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pt = _fmt(Locale->date_fmt, t, pt, ptlim,
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warnp);
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continue;
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case '%':
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/*
|
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** X311J/88-090 (4.12.3.5): if conversion char is
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** undefined, behavior is undefined. Print out the
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** character itself as printf(3) also does.
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*/
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default:
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break;
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}
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}
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if (pt == ptlim)
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break;
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*pt++ = *format;
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}
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return pt;
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}
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static char * _conv(const int n, const char *format, char *pt, const char *ptlim)
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{
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char buf[INT_STRLEN_MAXIMUM(int) + 1];
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(void) sprintf(buf, format, n);
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return _add(buf, pt, ptlim);
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}
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static char *_add(const char *str, char *pt, const char *ptlim)
|
||||
{
|
||||
while (pt < ptlim && (*pt = *str++) != '\0')
|
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++pt;
|
||||
return pt;
|
||||
}
|
||||
Reference in New Issue
Block a user