forked from KolibriOS/kolibrios
334 lines
12 KiB
C
334 lines
12 KiB
C
/* NOTE: This file defines both strftime() and wcsftime(). Take care when
|
|
* making changes. See also wcsftime.c, and note the (small) overlap in the
|
|
* manual description, taking care to edit both as needed. */
|
|
/*
|
|
* strftime.c
|
|
* Original Author: G. Haley
|
|
* Additions from: Eric Blake
|
|
* Changes to allow dual use as wcstime, also: Craig Howland
|
|
*
|
|
* Places characters into the array pointed to by s as controlled by the string
|
|
* pointed to by format. If the total number of resulting characters including
|
|
* the terminating null character is not more than maxsize, returns the number
|
|
* of characters placed into the array pointed to by s (not including the
|
|
* terminating null character); otherwise zero is returned and the contents of
|
|
* the array indeterminate.
|
|
*/
|
|
|
|
/*
|
|
FUNCTION
|
|
<<strftime>>---convert date and time to a formatted string
|
|
|
|
INDEX
|
|
strftime
|
|
|
|
ANSI_SYNOPSIS
|
|
#include <time.h>
|
|
size_t strftime(char *<[s]>, size_t <[maxsize]>,
|
|
const char *<[format]>, const struct tm *<[timp]>);
|
|
|
|
TRAD_SYNOPSIS
|
|
#include <time.h>
|
|
size_t strftime(<[s]>, <[maxsize]>, <[format]>, <[timp]>)
|
|
char *<[s]>;
|
|
size_t <[maxsize]>;
|
|
char *<[format]>;
|
|
struct tm *<[timp]>;
|
|
|
|
DESCRIPTION
|
|
<<strftime>> converts a <<struct tm>> representation of the time (at
|
|
<[timp]>) into a null-terminated string, starting at <[s]> and occupying
|
|
no more than <[maxsize]> characters.
|
|
|
|
You control the format of the output using the string at <[format]>.
|
|
<<*<[format]>>> can contain two kinds of specifications: text to be
|
|
copied literally into the formatted string, and time conversion
|
|
specifications. Time conversion specifications are two- and
|
|
three-character sequences beginning with `<<%>>' (use `<<%%>>' to
|
|
include a percent sign in the output). Each defined conversion
|
|
specification selects only the specified field(s) of calendar time
|
|
data from <<*<[timp]>>>, and converts it to a string in one of the
|
|
following ways:
|
|
|
|
o+
|
|
o %a
|
|
The abbreviated weekday name according to the current locale. [tm_wday]
|
|
|
|
o %A
|
|
The full weekday name according to the current locale.
|
|
In the default "C" locale, one of `<<Sunday>>', `<<Monday>>', `<<Tuesday>>',
|
|
`<<Wednesday>>', `<<Thursday>>', `<<Friday>>', `<<Saturday>>'. [tm_wday]
|
|
|
|
o %b
|
|
The abbreviated month name according to the current locale. [tm_mon]
|
|
|
|
o %B
|
|
The full month name according to the current locale.
|
|
In the default "C" locale, one of `<<January>>', `<<February>>',
|
|
`<<March>>', `<<April>>', `<<May>>', `<<June>>', `<<July>>',
|
|
`<<August>>', `<<September>>', `<<October>>', `<<November>>',
|
|
`<<December>>'. [tm_mon]
|
|
|
|
o %c
|
|
The preferred date and time representation for the current locale.
|
|
[tm_sec, tm_min, tm_hour, tm_mday, tm_mon, tm_year, tm_wday]
|
|
|
|
o %C
|
|
The century, that is, the year divided by 100 then truncated. For
|
|
4-digit years, the result is zero-padded and exactly two characters;
|
|
but for other years, there may a negative sign or more digits. In
|
|
this way, `<<%C%y>>' is equivalent to `<<%Y>>'. [tm_year]
|
|
|
|
o %d
|
|
The day of the month, formatted with two digits (from `<<01>>' to
|
|
`<<31>>'). [tm_mday]
|
|
|
|
o %D
|
|
A string representing the date, in the form `<<"%m/%d/%y">>'.
|
|
[tm_mday, tm_mon, tm_year]
|
|
|
|
o %e
|
|
The day of the month, formatted with leading space if single digit
|
|
(from `<<1>>' to `<<31>>'). [tm_mday]
|
|
|
|
o %E<<x>>
|
|
In some locales, the E modifier selects alternative representations of
|
|
certain modifiers <<x>>. In newlib, it is ignored, and treated as %<<x>>.
|
|
|
|
o %F
|
|
A string representing the ISO 8601:2000 date format, in the form
|
|
`<<"%Y-%m-%d">>'. [tm_mday, tm_mon, tm_year]
|
|
|
|
o %g
|
|
The last two digits of the week-based year, see specifier %G (from
|
|
`<<00>>' to `<<99>>'). [tm_year, tm_wday, tm_yday]
|
|
|
|
o %G
|
|
The week-based year. In the ISO 8601:2000 calendar, week 1 of the year
|
|
includes January 4th, and begin on Mondays. Therefore, if January 1st,
|
|
2nd, or 3rd falls on a Sunday, that day and earlier belong to the last
|
|
week of the previous year; and if December 29th, 30th, or 31st falls
|
|
on Monday, that day and later belong to week 1 of the next year. For
|
|
consistency with %Y, it always has at least four characters.
|
|
Example: "%G" for Saturday 2nd January 1999 gives "1998", and for
|
|
Tuesday 30th December 1997 gives "1998". [tm_year, tm_wday, tm_yday]
|
|
|
|
o %h
|
|
Synonym for "%b". [tm_mon]
|
|
|
|
o %H
|
|
The hour (on a 24-hour clock), formatted with two digits (from
|
|
`<<00>>' to `<<23>>'). [tm_hour]
|
|
|
|
o %I
|
|
The hour (on a 12-hour clock), formatted with two digits (from
|
|
`<<01>>' to `<<12>>'). [tm_hour]
|
|
|
|
o %j
|
|
The count of days in the year, formatted with three digits
|
|
(from `<<001>>' to `<<366>>'). [tm_yday]
|
|
|
|
o %k
|
|
The hour (on a 24-hour clock), formatted with leading space if single
|
|
digit (from `<<0>>' to `<<23>>'). Non-POSIX extension (c.p. %I). [tm_hour]
|
|
|
|
o %l
|
|
The hour (on a 12-hour clock), formatted with leading space if single
|
|
digit (from `<<1>>' to `<<12>>'). Non-POSIX extension (c.p. %H). [tm_hour]
|
|
|
|
o %m
|
|
The month number, formatted with two digits (from `<<01>>' to `<<12>>').
|
|
[tm_mon]
|
|
|
|
o %M
|
|
The minute, formatted with two digits (from `<<00>>' to `<<59>>'). [tm_min]
|
|
|
|
o %n
|
|
A newline character (`<<\n>>').
|
|
|
|
o %O<<x>>
|
|
In some locales, the O modifier selects alternative digit characters
|
|
for certain modifiers <<x>>. In newlib, it is ignored, and treated as %<<x>>.
|
|
|
|
o %p
|
|
Either `<<AM>>' or `<<PM>>' as appropriate, or the corresponding strings for
|
|
the current locale. [tm_hour]
|
|
|
|
o %P
|
|
Same as '<<%p>>', but in lowercase. This is a GNU extension. [tm_hour]
|
|
|
|
o %r
|
|
Replaced by the time in a.m. and p.m. notation. In the "C" locale this
|
|
is equivalent to "%I:%M:%S %p". In locales which don't define a.m./p.m.
|
|
notations, the result is an empty string. [tm_sec, tm_min, tm_hour]
|
|
|
|
o %R
|
|
The 24-hour time, to the minute. Equivalent to "%H:%M". [tm_min, tm_hour]
|
|
|
|
o %S
|
|
The second, formatted with two digits (from `<<00>>' to `<<60>>'). The
|
|
value 60 accounts for the occasional leap second. [tm_sec]
|
|
|
|
o %t
|
|
A tab character (`<<\t>>').
|
|
|
|
o %T
|
|
The 24-hour time, to the second. Equivalent to "%H:%M:%S". [tm_sec,
|
|
tm_min, tm_hour]
|
|
|
|
o %u
|
|
The weekday as a number, 1-based from Monday (from `<<1>>' to
|
|
`<<7>>'). [tm_wday]
|
|
|
|
o %U
|
|
The week number, where weeks start on Sunday, week 1 contains the first
|
|
Sunday in a year, and earlier days are in week 0. Formatted with two
|
|
digits (from `<<00>>' to `<<53>>'). See also <<%W>>. [tm_wday, tm_yday]
|
|
|
|
o %V
|
|
The week number, where weeks start on Monday, week 1 contains January 4th,
|
|
and earlier days are in the previous year. Formatted with two digits
|
|
(from `<<01>>' to `<<53>>'). See also <<%G>>. [tm_year, tm_wday, tm_yday]
|
|
|
|
o %w
|
|
The weekday as a number, 0-based from Sunday (from `<<0>>' to `<<6>>').
|
|
[tm_wday]
|
|
|
|
o %W
|
|
The week number, where weeks start on Monday, week 1 contains the first
|
|
Monday in a year, and earlier days are in week 0. Formatted with two
|
|
digits (from `<<00>>' to `<<53>>'). [tm_wday, tm_yday]
|
|
|
|
o %x
|
|
Replaced by the preferred date representation in the current locale.
|
|
In the "C" locale this is equivalent to "%m/%d/%y".
|
|
[tm_mon, tm_mday, tm_year]
|
|
|
|
o %X
|
|
Replaced by the preferred time representation in the current locale.
|
|
In the "C" locale this is equivalent to "%H:%M:%S". [tm_sec, tm_min, tm_hour]
|
|
|
|
o %y
|
|
The last two digits of the year (from `<<00>>' to `<<99>>'). [tm_year]
|
|
(Implementation interpretation: always positive, even for negative years.)
|
|
|
|
o %Y
|
|
The full year, equivalent to <<%C%y>>. It will always have at least four
|
|
characters, but may have more. The year is accurate even when tm_year
|
|
added to the offset of 1900 overflows an int. [tm_year]
|
|
|
|
o %z
|
|
The offset from UTC. The format consists of a sign (negative is west of
|
|
Greewich), two characters for hour, then two characters for minutes
|
|
(-hhmm or +hhmm). If tm_isdst is negative, the offset is unknown and no
|
|
output is generated; if it is zero, the offset is the standard offset for
|
|
the current time zone; and if it is positive, the offset is the daylight
|
|
savings offset for the current timezone. The offset is determined from
|
|
the TZ environment variable, as if by calling tzset(). [tm_isdst]
|
|
|
|
o %Z
|
|
The time zone name. If tm_isdst is negative, no output is generated.
|
|
Otherwise, the time zone name is based on the TZ environment variable,
|
|
as if by calling tzset(). [tm_isdst]
|
|
|
|
o %%
|
|
A single character, `<<%>>'.
|
|
o-
|
|
|
|
RETURNS
|
|
When the formatted time takes up no more than <[maxsize]> characters,
|
|
the result is the length of the formatted string. Otherwise, if the
|
|
formatting operation was abandoned due to lack of room, the result is
|
|
<<0>>, and the string starting at <[s]> corresponds to just those
|
|
parts of <<*<[format]>>> that could be completely filled in within the
|
|
<[maxsize]> limit.
|
|
|
|
PORTABILITY
|
|
ANSI C requires <<strftime>>, but does not specify the contents of
|
|
<<*<[s]>>> when the formatted string would require more than
|
|
<[maxsize]> characters. Unrecognized specifiers and fields of
|
|
<<timp>> that are out of range cause undefined results. Since some
|
|
formats expand to 0 bytes, it is wise to set <<*<[s]>>> to a nonzero
|
|
value beforehand to distinguish between failure and an empty string.
|
|
This implementation does not support <<s>> being NULL, nor overlapping
|
|
<<s>> and <<format>>.
|
|
|
|
<<strftime>> requires no supporting OS subroutines.
|
|
|
|
BUGS
|
|
<<strftime>> ignores the LC_TIME category of the current locale, hard-coding
|
|
the "C" locale settings.
|
|
*/
|
|
|
|
#include <newlib.h>
|
|
#include <sys/config.h>
|
|
#include <stddef.h>
|
|
#include <stdio.h>
|
|
#include <time.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#include <limits.h>
|
|
#include <ctype.h>
|
|
#include <wctype.h>
|
|
|
|
/* Defines to make the file dual use for either strftime() or wcsftime().
|
|
* To get wcsftime, define MAKE_WCSFTIME.
|
|
* To get strftime, do not define MAKE_WCSFTIME.
|
|
* Names are kept friendly to strftime() usage. The biggest ugliness is the
|
|
* use of the CQ() macro to make either regular character constants and
|
|
* string literals or wide-character constants and wide-character-string
|
|
* literals, as appropriate. */
|
|
#if !defined(MAKE_WCSFTIME)
|
|
# define CHAR char /* string type basis */
|
|
# define CQ(a) a /* character constant qualifier */
|
|
# define SFLG /* %s flag (null for normal char) */
|
|
# define _ctloc(x) (ctloclen = strlen (ctloc = _CurrentTimeLocale->x), ctloc)
|
|
# define TOLOWER(c) tolower((int)(unsigned char)(c))
|
|
# define STRTOUL(c,p,b) strtoul((c),(p),(b))
|
|
# define STRCPY(a,b) strcpy((a),(b))
|
|
# define STRCHR(a,b) strchr((a),(b))
|
|
# define STRLEN(a) strlen(a)
|
|
# else
|
|
# define strftime wcsftime /* Alternate function name */
|
|
# define CHAR wchar_t /* string type basis */
|
|
# define CQ(a) L##a /* character constant qualifier */
|
|
# define snprintf swprintf /* wide-char equivalent function name */
|
|
# define strncmp wcsncmp /* wide-char equivalent function name */
|
|
# define TOLOWER(c) towlower((wint_t)(c))
|
|
# define STRTOUL(c,p,b) wcstoul((c),(p),(b))
|
|
# define STRCPY(a,b) wcscpy((a),(b))
|
|
# define STRCHR(a,b) wcschr((a),(b))
|
|
# define STRLEN(a) wcslen(a)
|
|
# define SFLG "l" /* %s flag (l for wide char) */
|
|
# ifdef __HAVE_LOCALE_INFO_EXTENDED__
|
|
# define _ctloc(x) (ctloclen = wcslen (ctloc = _CurrentTimeLocale->w##x), \
|
|
ctloc)
|
|
# else
|
|
# define CTLOCBUFLEN 256 /* Arbitrary big buffer size */
|
|
const wchar_t *
|
|
__ctloc (wchar_t *buf, const char *elem, size_t *len_ret)
|
|
{
|
|
buf[CTLOCBUFLEN - 1] = L'\0';
|
|
*len_ret = mbstowcs (buf, elem, CTLOCBUFLEN - 1);
|
|
if (*len_ret == (size_t) -1 )
|
|
*len_ret = 0;
|
|
return buf;
|
|
}
|
|
# define _ctloc(x) (ctloc = __ctloc (ctlocbuf, _CurrentTimeLocale->x, \
|
|
&ctloclen))
|
|
# endif
|
|
#endif /* MAKE_WCSFTIME */
|
|
|
|
|
|
size_t _DEFUN (strftime, (s, maxsize, format, tim_p),
|
|
CHAR *s _AND
|
|
size_t maxsize _AND
|
|
_CONST CHAR *format _AND
|
|
_CONST struct tm *tim_p)
|
|
{
|
|
|
|
return 0;
|
|
}
|
|
|
|
|