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