strftime.c File Reference

#include "postgres.h"
#include <fcntl.h>
#include "private.h"

Include dependency graph for strftime.c:

Go to the source code of this file.

Data Structures
struct	lc_time_T

Macros
#define	Locale   (&C_time_locale)
#define	DIVISOR   100

Enumerations
enum	warn { IN_NONE , IN_SOME , IN_THIS , IN_ALL }

Functions
static char *	_add (const char *str, char *pt, const char *ptlim)
static char *	_conv (int n, const char *format, char *pt, const char *ptlim)
static char *	_fmt (const char *format, const struct pg_tm *t, char *pt, const char *ptlim, enum warn *warnp)
static char *	_yconv (int a, int b, bool convert_top, bool convert_yy, char *pt, char const *ptlim)
size_t	pg_strftime (char *s, size_t maxsize, const char *format, const struct pg_tm *t)

Variables
static const struct lc_time_T	C_time_locale

Macro Definition Documentation

DIVISOR

#define DIVISOR   100

Locale

#define Locale   (&C_time_locale)

Definition at line 62 of file strftime.c.

Enumeration Type Documentation

warn

enum warn

(

void

)

Enumerator
IN_NONE
IN_SOME
IN_THIS
IN_ALL

Definition at line 109 of file strftime.c.

{
    IN_NONE, IN_SOME, IN_THIS, IN_ALL
};

Function Documentation

_add()

static char * _add ( const char *  str, char *  pt, const char *  ptlim  )

static

Definition at line 525 of file strftime.c.

{
    while (pt < ptlim && (*pt = *str++) != '\0')
        ++pt;
    return pt;
}

References str.

Referenced by _conv(), _fmt(), and _yconv().

_conv()

static char * _conv ( int  n, const char *  format, char *  pt, const char *  ptlim  )

static

Definition at line 516 of file strftime.c.

{
    char        buf[INT_STRLEN_MAXIMUM(int) + 1];
 
    sprintf(buf, format, n);
    return _add(buf, pt, ptlim);
}

References _add(), buf, format, INT_STRLEN_MAXIMUM, and sprintf.

Referenced by _fmt(), and _yconv().

_fmt()

static char * _fmt ( const char *  format, const struct pg_tm *  t, char *  pt, const char *  ptlim, enum warn *  warnp  )

static

Definition at line 151 of file strftime.c.

{
    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;
}

References _add(), _conv(), _yconv(), DAYSPERLYEAR, DAYSPERNYEAR, DAYSPERWEEK, format, HOURSPERDAY, IN_ALL, IN_SOME, IN_THIS, isleap_sum, label, len, Locale, MINSPERHOUR, MONSPERYEAR, SECSPERMIN, sign, pg_tm::tm_gmtoff, pg_tm::tm_hour, pg_tm::tm_isdst, pg_tm::tm_mday, pg_tm::tm_min, pg_tm::tm_mon, pg_tm::tm_sec, pg_tm::tm_wday, pg_tm::tm_yday, pg_tm::tm_year, TM_YEAR_BASE, pg_tm::tm_zone, and lc_time_T::wday.

Referenced by pg_strftime().

_yconv()

static char * _yconv ( int  a, int  b, bool  convert_top, bool  convert_yy, char *  pt, char const *  ptlim  )

static

Definition at line 541 of file strftime.c.

{
    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;
}

References _add(), _conv(), a, b, and DIVISOR.

Referenced by _fmt().

pg_strftime()

size_t pg_strftime	(	char *	s,
		size_t	maxsize,
		const char *	format,
		const struct pg_tm *	t
	)

Definition at line 128 of file strftime.c.

{
    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;
}

References _fmt(), EOVERFLOW, format, and IN_NONE.

Referenced by AddFileToBackupManifest(), build_backup_content(), get_formatted_log_time(), get_formatted_start_time(), log_status_format(), logfile_getname(), str_time(), and timeofday().

Variable Documentation

C_time_locale

const struct lc_time_T C_time_locale

static

Definition at line 1 of file strftime.c.