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newlib-cygwin/newlib/libc/time/strftime.c

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/* 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 <stddef.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <ctype.h>
#include <wctype.h>
#include "local.h"
#include "../locale/timelocal.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))
# 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 SFLG "l" /* %s flag (l for wide char) */
# 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 /* MAKE_WCSFTIME */
/* Enforce the coding assumptions that YEAR_BASE is positive. (%C, %Y, etc.) */
#if YEAR_BASE < 0
# error "YEAR_BASE < 0"
#endif
static _CONST int dname_len[7] =
{6, 6, 7, 9, 8, 6, 8};
/* Using the tm_year, tm_wday, and tm_yday components of TIM_P, return
-1, 0, or 1 as the adjustment to add to the year for the ISO week
numbering used in "%g%G%V", avoiding overflow. */
static int
_DEFUN (iso_year_adjust, (tim_p),
_CONST struct tm *tim_p)
{
/* Account for fact that tm_year==0 is year 1900. */
int leap = isleap (tim_p->tm_year + (YEAR_BASE
- (tim_p->tm_year < 0 ? 0 : 2000)));
/* Pack the yday, wday, and leap year into a single int since there are so
many disparate cases. */
#define PACK(yd, wd, lp) (((yd) << 4) + (wd << 1) + (lp))
switch (PACK (tim_p->tm_yday, tim_p->tm_wday, leap))
{
case PACK (0, 5, 0): /* Jan 1 is Fri, not leap. */
case PACK (0, 6, 0): /* Jan 1 is Sat, not leap. */
case PACK (0, 0, 0): /* Jan 1 is Sun, not leap. */
case PACK (0, 5, 1): /* Jan 1 is Fri, leap year. */
case PACK (0, 6, 1): /* Jan 1 is Sat, leap year. */
case PACK (0, 0, 1): /* Jan 1 is Sun, leap year. */
case PACK (1, 6, 0): /* Jan 2 is Sat, not leap. */
case PACK (1, 0, 0): /* Jan 2 is Sun, not leap. */
case PACK (1, 6, 1): /* Jan 2 is Sat, leap year. */
case PACK (1, 0, 1): /* Jan 2 is Sun, leap year. */
case PACK (2, 0, 0): /* Jan 3 is Sun, not leap. */
case PACK (2, 0, 1): /* Jan 3 is Sun, leap year. */
return -1; /* Belongs to last week of previous year. */
case PACK (362, 1, 0): /* Dec 29 is Mon, not leap. */
case PACK (363, 1, 1): /* Dec 29 is Mon, leap year. */
case PACK (363, 1, 0): /* Dec 30 is Mon, not leap. */
case PACK (363, 2, 0): /* Dec 30 is Tue, not leap. */
case PACK (364, 1, 1): /* Dec 30 is Mon, leap year. */
case PACK (364, 2, 1): /* Dec 30 is Tue, leap year. */
case PACK (364, 1, 0): /* Dec 31 is Mon, not leap. */
case PACK (364, 2, 0): /* Dec 31 is Tue, not leap. */
case PACK (364, 3, 0): /* Dec 31 is Wed, not leap. */
case PACK (365, 1, 1): /* Dec 31 is Mon, leap year. */
case PACK (365, 2, 1): /* Dec 31 is Tue, leap year. */
case PACK (365, 3, 1): /* Dec 31 is Wed, leap year. */
return 1; /* Belongs to first week of next year. */
}
return 0; /* Belongs to specified year. */
#undef PACK
}
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)
{
size_t count = 0;
int i, len;
const CHAR *ctloc;
#ifdef MAKE_WCSFTIME
CHAR ctlocbuf[CTLOCBUFLEN];
#endif
size_t ctloclen;
struct lc_time_T *_CurrentTimeLocale = __get_current_time_locale ();
for (;;)
{
while (*format && *format != CQ('%'))
{
if (count < maxsize - 1)
s[count++] = *format++;
else
return 0;
}
if (*format == CQ('\0'))
break;
format++;
if (*format == CQ('E') || *format == CQ('O'))
format++;
switch (*format)
{
case CQ('a'):
_ctloc (wday[tim_p->tm_wday]);
for (i = 0; i < ctloclen; i++)
{
if (count < maxsize - 1)
s[count++] = ctloc[i];
else
return 0;
}
break;
case CQ('A'):
_ctloc (weekday[tim_p->tm_wday]);
for (i = 0; i < ctloclen; i++)
{
if (count < maxsize - 1)
s[count++] = ctloc[i];
else
return 0;
}
break;
case CQ('b'):
case CQ('h'):
_ctloc (mon[tim_p->tm_mon]);
for (i = 0; i < ctloclen; i++)
{
if (count < maxsize - 1)
s[count++] = ctloc[i];
else
return 0;
}
break;
case CQ('B'):
_ctloc (month[tim_p->tm_mon]);
for (i = 0; i < ctloclen; i++)
{
if (count < maxsize - 1)
s[count++] = ctloc[i];
else
return 0;
}
break;
case CQ('c'):
_ctloc (c_fmt);
goto recurse;
case CQ('r'):
_ctloc (ampm_fmt);
goto recurse;
case CQ('x'):
_ctloc (x_fmt);
goto recurse;
case CQ('X'):
_ctloc (X_fmt);
recurse:
if (*ctloc)
{
/* Recurse to avoid need to replicate %Y formation. */
size_t adjust = strftime (&s[count], maxsize - count, ctloc,
tim_p);
if (adjust > 0)
count += adjust;
else
return 0;
}
break;
case CQ('C'):
{
/* Examples of (tm_year + YEAR_BASE) that show how %Y == %C%y
with 32-bit int.
%Y %C %y
2147485547 21474855 47
10000 100 00
9999 99 99
0999 09 99
0099 00 99
0001 00 01
0000 00 00
-001 -0 01
-099 -0 99
-999 -9 99
-1000 -10 00
-10000 -100 00
-2147481748 -21474817 48
Be careful of both overflow and sign adjustment due to the
asymmetric range of years.
*/
int neg = tim_p->tm_year < -YEAR_BASE;
int century = tim_p->tm_year >= 0
? tim_p->tm_year / 100 + YEAR_BASE / 100
: abs (tim_p->tm_year + YEAR_BASE) / 100;
len = snprintf (&s[count], maxsize - count, CQ("%s%.*d"),
neg ? CQ("-") : CQ(""), 2 - neg, century);
if (len < 0 || (count+=len) >= maxsize) return 0;
}
break;
case CQ('d'):
case CQ('e'):
len = snprintf (&s[count], maxsize - count,
*format == CQ('d') ? CQ("%.2d") : CQ("%2d"),
tim_p->tm_mday);
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('D'):
/* %m/%d/%y */
len = snprintf (&s[count], maxsize - count,
CQ("%.2d/%.2d/%.2d"),
tim_p->tm_mon + 1, tim_p->tm_mday,
tim_p->tm_year >= 0 ? tim_p->tm_year % 100
: abs (tim_p->tm_year + YEAR_BASE) % 100);
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('F'):
{ /* %F is equivalent to "%Y-%m-%d" */
/* Recurse to avoid need to replicate %Y formation. */
size_t adjust = strftime (&s[count], maxsize - count,
CQ("%Y-%m-%d"), tim_p);
if (adjust > 0)
count += adjust;
else
return 0;
}
break;
case CQ('g'):
/* Be careful of both overflow and negative years, thanks to
the asymmetric range of years. */
{
int adjust = iso_year_adjust (tim_p);
int year = tim_p->tm_year >= 0 ? tim_p->tm_year % 100
: abs (tim_p->tm_year + YEAR_BASE) % 100;
if (adjust < 0 && tim_p->tm_year <= -YEAR_BASE)
adjust = 1;
else if (adjust > 0 && tim_p->tm_year < -YEAR_BASE)
adjust = -1;
len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
((year + adjust) % 100 + 100) % 100);
if (len < 0 || (count+=len) >= maxsize) return 0;
}
break;
case CQ('G'):
{
/* See the comments for 'C' and 'Y'; this is a variable length
field. Although there is no requirement for a minimum number
of digits, we use 4 for consistency with 'Y'. */
int neg = tim_p->tm_year < -YEAR_BASE;
int adjust = iso_year_adjust (tim_p);
int century = tim_p->tm_year >= 0
? tim_p->tm_year / 100 + YEAR_BASE / 100
: abs (tim_p->tm_year + YEAR_BASE) / 100;
int year = tim_p->tm_year >= 0 ? tim_p->tm_year % 100
: abs (tim_p->tm_year + YEAR_BASE) % 100;
if (adjust < 0 && tim_p->tm_year <= -YEAR_BASE)
neg = adjust = 1;
else if (adjust > 0 && neg)
adjust = -1;
year += adjust;
if (year == -1)
{
year = 99;
--century;
}
else if (year == 100)
{
year = 0;
++century;
}
len = snprintf (&s[count], maxsize - count, CQ("%s%.*d%.2d"),
neg ? CQ("-") : CQ(""), 2 - neg, century, year);
if (len < 0 || (count+=len) >= maxsize)
return 0;
}
break;
case CQ('H'):
case CQ('k'): /* newlib extension */
len = snprintf (&s[count], maxsize - count,
*format == CQ('k') ? CQ("%2d") : CQ("%.2d"),
tim_p->tm_hour);
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('I'):
case CQ('l'): /* newlib extension */
{
register int h12;
h12 = (tim_p->tm_hour == 0 || tim_p->tm_hour == 12) ?
12 : tim_p->tm_hour % 12;
len = snprintf (&s[count], maxsize - count,
*format == CQ('I') ? CQ("%.2d") : CQ("%2d"),
h12);
if (len < 0 || (count+=len) >= maxsize) return 0;
}
break;
case CQ('j'):
len = snprintf (&s[count], maxsize - count, CQ("%.3d"),
tim_p->tm_yday + 1);
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('m'):
len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
tim_p->tm_mon + 1);
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('M'):
len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
tim_p->tm_min);
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('n'):
if (count < maxsize - 1)
s[count++] = CQ('\n');
else
return 0;
break;
case CQ('p'):
case CQ('P'):
_ctloc (am_pm[tim_p->tm_hour < 12 ? 0 : 1]);
for (i = 0; i < ctloclen; i++)
{
if (count < maxsize - 1)
s[count++] = (*format == CQ('P') ? TOLOWER (ctloc[i])
: ctloc[i]);
else
return 0;
}
break;
case CQ('R'):
len = snprintf (&s[count], maxsize - count, CQ("%.2d:%.2d"),
tim_p->tm_hour, tim_p->tm_min);
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('S'):
len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
tim_p->tm_sec);
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('t'):
if (count < maxsize - 1)
s[count++] = CQ('\t');
else
return 0;
break;
case CQ('T'):
len = snprintf (&s[count], maxsize - count, CQ("%.2d:%.2d:%.2d"),
tim_p->tm_hour, tim_p->tm_min, tim_p->tm_sec);
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('u'):
if (count < maxsize - 1)
{
if (tim_p->tm_wday == 0)
s[count++] = CQ('7');
else
s[count++] = CQ('0') + tim_p->tm_wday;
}
else
return 0;
break;
case CQ('U'):
len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
(tim_p->tm_yday + 7 -
tim_p->tm_wday) / 7);
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('V'):
{
int adjust = iso_year_adjust (tim_p);
int wday = (tim_p->tm_wday) ? tim_p->tm_wday - 1 : 6;
int week = (tim_p->tm_yday + 10 - wday) / 7;
if (adjust > 0)
week = 1;
else if (adjust < 0)
/* Previous year has 53 weeks if current year starts on
Fri, and also if current year starts on Sat and
previous year was leap year. */
week = 52 + (4 >= (wday - tim_p->tm_yday
- isleap (tim_p->tm_year
+ (YEAR_BASE - 1
- (tim_p->tm_year < 0
? 0 : 2000)))));
len = snprintf (&s[count], maxsize - count, CQ("%.2d"), week);
if (len < 0 || (count+=len) >= maxsize) return 0;
}
break;
case CQ('w'):
if (count < maxsize - 1)
s[count++] = CQ('0') + tim_p->tm_wday;
else
return 0;
break;
case CQ('W'):
{
int wday = (tim_p->tm_wday) ? tim_p->tm_wday - 1 : 6;
len = snprintf (&s[count], maxsize - count, CQ("%.2d"),
(tim_p->tm_yday + 7 - wday) / 7);
if (len < 0 || (count+=len) >= maxsize) return 0;
}
break;
case CQ('y'):
{
/* Be careful of both overflow and negative years, thanks to
the asymmetric range of years. */
int year = tim_p->tm_year >= 0 ? tim_p->tm_year % 100
: abs (tim_p->tm_year + YEAR_BASE) % 100;
len = snprintf (&s[count], maxsize - count, CQ("%.2d"), year);
if (len < 0 || (count+=len) >= maxsize) return 0;
}
break;
case CQ('Y'):
/* An implementation choice is to have %Y match %C%y, so that it
* gives at least 4 digits, with leading zeros as needed. */
if(tim_p->tm_year <= INT_MAX-YEAR_BASE) {
/* For normal, non-overflow case. */
len = snprintf (&s[count], maxsize - count, CQ("%04d"),
tim_p->tm_year + YEAR_BASE);
}
else {
/* int would overflow, so use unsigned instead. */
register unsigned year;
year = (unsigned) tim_p->tm_year + (unsigned) YEAR_BASE;
len = snprintf (&s[count], maxsize - count, CQ("%04u"),
tim_p->tm_year + YEAR_BASE);
}
if (len < 0 || (count+=len) >= maxsize) return 0;
break;
case CQ('z'):
if (tim_p->tm_isdst >= 0)
{
long offset;
__tzinfo_type *tz = __gettzinfo ();
TZ_LOCK;
/* The sign of this is exactly opposite the envvar TZ. We
could directly use the global _timezone for tm_isdst==0,
but have to use __tzrule for daylight savings. */
offset = -tz->__tzrule[tim_p->tm_isdst > 0].offset;
TZ_UNLOCK;
len = snprintf (&s[count], maxsize - count, CQ("%+03ld%.2ld"),
offset / SECSPERHOUR,
labs (offset / SECSPERMIN) % 60L);
if (len < 0 || (count+=len) >= maxsize) return 0;
}
break;
case CQ('Z'):
if (tim_p->tm_isdst >= 0)
{
int size;
TZ_LOCK;
size = strlen(_tzname[tim_p->tm_isdst > 0]);
for (i = 0; i < size; i++)
{
if (count < maxsize - 1)
s[count++] = _tzname[tim_p->tm_isdst > 0][i];
else
{
TZ_UNLOCK;
return 0;
}
}
TZ_UNLOCK;
}
break;
case CQ('%'):
if (count < maxsize - 1)
s[count++] = CQ('%');
else
return 0;
break;
}
if (*format)
format++;
else
break;
}
if (maxsize)
s[count] = CQ('\0');
return count;
}
/* The remainder of this file can serve as a regression test. Compile
* with -D_REGRESSION_TEST. */
#if defined(_REGRESSION_TEST) /* [Test code: */
/* This test code relies on ANSI C features, in particular on the ability
* of adjacent strings to be pasted together into one string. */
/* Test output buffer size (should be larger than all expected results) */
#define OUTSIZE 256
struct test {
CHAR *fmt; /* Testing format */
size_t max; /* Testing maxsize */
size_t ret; /* Expected return value */
CHAR *out; /* Expected output string */
};
struct list {
const struct tm *tms; /* Time used for these vectors */
const struct test *vec; /* Test vectors */
int cnt; /* Number of vectors */
};
const char TZ[]="TZ=EST5EDT";
/* Define list of test inputs and expected outputs, for the given time zone
* and time. */
const struct tm tm0 = {
/* Tue Dec 30 10:53:47 EST 2008 (time_t=1230648827) */
.tm_sec = 47,
.tm_min = 53,
.tm_hour = 9,
.tm_mday = 30,
.tm_mon = 11,
.tm_year = 108,
.tm_wday = 2,
.tm_yday = 364,
.tm_isdst = 0
};
const struct test Vec0[] = {
/* Testing fields one at a time, expecting to pass, using exact
* allowed length as what is needed. */
/* Using tm0 for time: */
#define EXP(s) sizeof(s)/sizeof(CHAR)-1, s
{ CQ("%a"), 3+1, EXP(CQ("Tue")) },
{ CQ("%A"), 7+1, EXP(CQ("Tuesday")) },
{ CQ("%b"), 3+1, EXP(CQ("Dec")) },
{ CQ("%B"), 8+1, EXP(CQ("December")) },
{ CQ("%c"), 24+1, EXP(CQ("Tue Dec 30 09:53:47 2008")) },
{ CQ("%C"), 2+1, EXP(CQ("20")) },
{ CQ("%d"), 2+1, EXP(CQ("30")) },
{ CQ("%D"), 8+1, EXP(CQ("12/30/08")) },
{ CQ("%e"), 2+1, EXP(CQ("30")) },
{ CQ("%F"), 10+1, EXP(CQ("2008-12-30")) },
{ CQ("%g"), 2+1, EXP(CQ("09")) },
{ CQ("%G"), 4+1, EXP(CQ("2009")) },
{ CQ("%h"), 3+1, EXP(CQ("Dec")) },
{ CQ("%H"), 2+1, EXP(CQ("09")) },
{ CQ("%I"), 2+1, EXP(CQ("09")) },
{ CQ("%j"), 3+1, EXP(CQ("365")) },
{ CQ("%k"), 2+1, EXP(CQ(" 9")) },
{ CQ("%l"), 2+1, EXP(CQ(" 9")) },
{ CQ("%m"), 2+1, EXP(CQ("12")) },
{ CQ("%M"), 2+1, EXP(CQ("53")) },
{ CQ("%n"), 1+1, EXP(CQ("\n")) },
{ CQ("%p"), 2+1, EXP(CQ("AM")) },
{ CQ("%r"), 11+1, EXP(CQ("09:53:47 AM")) },
{ CQ("%R"), 5+1, EXP(CQ("09:53")) },
{ CQ("%S"), 2+1, EXP(CQ("47")) },
{ CQ("%t"), 1+1, EXP(CQ("\t")) },
{ CQ("%T"), 8+1, EXP(CQ("09:53:47")) },
{ CQ("%u"), 1+1, EXP(CQ("2")) },
{ CQ("%U"), 2+1, EXP(CQ("52")) },
{ CQ("%V"), 2+1, EXP(CQ("01")) },
{ CQ("%w"), 1+1, EXP(CQ("2")) },
{ CQ("%W"), 2+1, EXP(CQ("52")) },
{ CQ("%x"), 8+1, EXP(CQ("12/30/08")) },
{ CQ("%X"), 8+1, EXP(CQ("09:53:47")) },
{ CQ("%y"), 2+1, EXP(CQ("08")) },
{ CQ("%Y"), 4+1, EXP(CQ("2008")) },
{ CQ("%z"), 5+1, EXP(CQ("-0500")) },
{ CQ("%Z"), 3+1, EXP(CQ("EST")) },
{ CQ("%%"), 1+1, EXP(CQ("%")) },
#undef EXP
};
/* Define list of test inputs and expected outputs, for the given time zone
* and time. */
const struct tm tm1 = {
/* Wed Jul 2 23:01:13 EDT 2008 (time_t=1215054073) */
.tm_sec = 13,
.tm_min = 1,
.tm_hour = 23,
.tm_mday = 2,
.tm_mon = 6,
.tm_year = 108,
.tm_wday = 3,
.tm_yday = 183,
.tm_isdst = 1
};
const struct test Vec1[] = {
/* Testing fields one at a time, expecting to pass, using exact
* allowed length as what is needed. */
/* Using tm1 for time: */
#define EXP(s) sizeof(s)/sizeof(CHAR)-1, s
{ CQ("%a"), 3+1, EXP(CQ("Wed")) },
{ CQ("%A"), 9+1, EXP(CQ("Wednesday")) },
{ CQ("%b"), 3+1, EXP(CQ("Jul")) },
{ CQ("%B"), 4+1, EXP(CQ("July")) },
{ CQ("%c"), 24+1, EXP(CQ("Wed Jul 2 23:01:13 2008")) },
{ CQ("%C"), 2+1, EXP(CQ("20")) },
{ CQ("%d"), 2+1, EXP(CQ("02")) },
{ CQ("%D"), 8+1, EXP(CQ("07/02/08")) },
{ CQ("%e"), 2+1, EXP(CQ(" 2")) },
{ CQ("%F"), 10+1, EXP(CQ("2008-07-02")) },
{ CQ("%g"), 2+1, EXP(CQ("08")) },
{ CQ("%G"), 4+1, EXP(CQ("2008")) },
{ CQ("%h"), 3+1, EXP(CQ("Jul")) },
{ CQ("%H"), 2+1, EXP(CQ("23")) },
{ CQ("%I"), 2+1, EXP(CQ("11")) },
{ CQ("%j"), 3+1, EXP(CQ("184")) },
{ CQ("%k"), 2+1, EXP(CQ("23")) },
{ CQ("%l"), 2+1, EXP(CQ("11")) },
{ CQ("%m"), 2+1, EXP(CQ("07")) },
{ CQ("%M"), 2+1, EXP(CQ("01")) },
{ CQ("%n"), 1+1, EXP(CQ("\n")) },
{ CQ("%p"), 2+1, EXP(CQ("PM")) },
{ CQ("%r"), 11+1, EXP(CQ("11:01:13 PM")) },
{ CQ("%R"), 5+1, EXP(CQ("23:01")) },
{ CQ("%S"), 2+1, EXP(CQ("13")) },
{ CQ("%t"), 1+1, EXP(CQ("\t")) },
{ CQ("%T"), 8+1, EXP(CQ("23:01:13")) },
{ CQ("%u"), 1+1, EXP(CQ("3")) },
{ CQ("%U"), 2+1, EXP(CQ("26")) },
{ CQ("%V"), 2+1, EXP(CQ("27")) },
{ CQ("%w"), 1+1, EXP(CQ("3")) },
{ CQ("%W"), 2+1, EXP(CQ("26")) },
{ CQ("%x"), 8+1, EXP(CQ("07/02/08")) },
{ CQ("%X"), 8+1, EXP(CQ("23:01:13")) },
{ CQ("%y"), 2+1, EXP(CQ("08")) },
{ CQ("%Y"), 4+1, EXP(CQ("2008")) },
{ CQ("%z"), 5+1, EXP(CQ("-0400")) },
{ CQ("%Z"), 3+1, EXP(CQ("EDT")) },
{ CQ("%%"), 1+1, EXP(CQ("%")) },
#undef EXP
#define VEC(s) s, sizeof(s)/sizeof(CHAR), sizeof(s)/sizeof(CHAR)-1, s
#define EXP(s) sizeof(s)/sizeof(CHAR), sizeof(s)/sizeof(CHAR)-1, s
{ VEC(CQ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")) },
{ CQ("0123456789%%%h:`~"), EXP(CQ("0123456789%Jul:`~")) },
{ CQ("%R%h:`~ %x %w"), EXP(CQ("23:01Jul:`~ 07/02/08 3")) },
#undef VEC
#undef EXP
};
#if YEAR_BASE == 1900 /* ( */
/* Checks for very large years. YEAR_BASE value relied upon so that the
* answer strings can be predetermined.
* Years more than 4 digits are not mentioned in the standard for %C, so the
* test for those cases are based on the design intent (which is to print the
* whole number, being the century). */
const struct tm tmyr0 = {
/* Wed Jul 2 23:01:13 EDT [HUGE#] */
.tm_sec = 13,
.tm_min = 1,
.tm_hour = 23,
.tm_mday = 2,
.tm_mon = 6,
.tm_year = INT_MAX - YEAR_BASE/2,
.tm_wday = 3,
.tm_yday = 183,
.tm_isdst = 1
};
#if INT_MAX == 32767
# define YEAR CQ("33717") /* INT_MAX + YEAR_BASE/2 */
# define CENT CQ("337")
# define Year CQ("17")
# elif INT_MAX == 2147483647
# define YEAR CQ("2147484597")
# define CENT CQ("21474845")
# define Year CQ("97")
# elif INT_MAX == 9223372036854775807
# define YEAR CQ("9223372036854776757")
# define CENT CQ("92233720368547777")
# define Year CQ("57")
# else
# error "Unrecognized INT_MAX value: enhance me to recognize what you have"
#endif
const struct test Vecyr0[] = {
/* Testing fields one at a time, expecting to pass, using a larger
* allowed length than what is needed. */
/* Using tmyr0 for time: */
#define EXP(s) sizeof(s)/sizeof(CHAR)-1, s
{ CQ("%C"), OUTSIZE, EXP(CENT) },
{ CQ("%c"), OUTSIZE, EXP(CQ("Wed Jul 2 23:01:13 ")YEAR) },
{ CQ("%D"), OUTSIZE, EXP(CQ("07/02/")Year) },
{ CQ("%F"), OUTSIZE, EXP(YEAR CQ("-07-02")) },
{ CQ("%x"), OUTSIZE, EXP(CQ("07/02/")Year) },
{ CQ("%y"), OUTSIZE, EXP(Year) },
{ CQ("%Y"), OUTSIZE, EXP(YEAR) },
#undef EXP
};
#undef YEAR
#undef CENT
#undef Year
/* Checks for very large negative years. YEAR_BASE value relied upon so that
* the answer strings can be predetermined. */
const struct tm tmyr1 = {
/* Wed Jul 2 23:01:13 EDT [HUGE#] */
.tm_sec = 13,
.tm_min = 1,
.tm_hour = 23,
.tm_mday = 2,
.tm_mon = 6,
.tm_year = INT_MIN,
.tm_wday = 3,
.tm_yday = 183,
.tm_isdst = 1
};
#if INT_MAX == 32767
# define YEAR CQ("-30868") /* INT_MIN + YEAR_BASE */
# define CENT CQ("-308")
# define Year CQ("68")
# elif INT_MAX == 2147483647
# define YEAR CQ("-2147481748")
# define CENT CQ("-21474817")
# define Year CQ("48")
# elif INT_MAX == 9223372036854775807
# define YEAR CQ("-9223372036854773908")
# define CENT CQ("-92233720368547739")
# define Year CQ("08")
# else
# error "Unrecognized INT_MAX value: enhance me to recognize what you have"
#endif
const struct test Vecyr1[] = {
/* Testing fields one at a time, expecting to pass, using a larger
* allowed length than what is needed. */
/* Using tmyr1 for time: */
#define EXP(s) sizeof(s)/sizeof(CHAR)-1, s
{ CQ("%C"), OUTSIZE, EXP(CENT) },
{ CQ("%c"), OUTSIZE, EXP(CQ("Wed Jul 2 23:01:13 ")YEAR) },
{ CQ("%D"), OUTSIZE, EXP(CQ("07/02/")Year) },
{ CQ("%F"), OUTSIZE, EXP(YEAR CQ("-07-02")) },
{ CQ("%x"), OUTSIZE, EXP(CQ("07/02/")Year) },
{ CQ("%y"), OUTSIZE, EXP(Year) },
{ CQ("%Y"), OUTSIZE, EXP(YEAR) },
#undef EXP
};
#undef YEAR
#undef CENT
#undef Year
#endif /* YEAR_BASE ) */
/* Checks for years just over zero (also test for s=60).
* Years less than 4 digits are not mentioned for %Y in the standard, so the
* test for that case is based on the design intent. */
const struct tm tmyrzp = {
/* Wed Jul 2 23:01:60 EDT 0007 */
.tm_sec = 60,
.tm_min = 1,
.tm_hour = 23,
.tm_mday = 2,
.tm_mon = 6,
.tm_year = 7-YEAR_BASE,
.tm_wday = 3,
.tm_yday = 183,
.tm_isdst = 1
};
#define YEAR CQ("0007") /* Design intent: %Y=%C%y */
#define CENT CQ("00")
#define Year CQ("07")
const struct test Vecyrzp[] = {
/* Testing fields one at a time, expecting to pass, using a larger
* allowed length than what is needed. */
/* Using tmyrzp for time: */
#define EXP(s) sizeof(s)/sizeof(CHAR)-1, s
{ CQ("%C"), OUTSIZE, EXP(CENT) },
{ CQ("%c"), OUTSIZE, EXP(CQ("Wed Jul 2 23:01:60 ")YEAR) },
{ CQ("%D"), OUTSIZE, EXP(CQ("07/02/")Year) },
{ CQ("%F"), OUTSIZE, EXP(YEAR CQ("-07-02")) },
{ CQ("%x"), OUTSIZE, EXP(CQ("07/02/")Year) },
{ CQ("%y"), OUTSIZE, EXP(Year) },
{ CQ("%Y"), OUTSIZE, EXP(YEAR) },
#undef EXP
};
#undef YEAR
#undef CENT
#undef Year
/* Checks for years just under zero.
* Negative years are not handled by the standard, so the vectors here are
* verifying the chosen implemtation. */
const struct tm tmyrzn = {
/* Wed Jul 2 23:01:00 EDT -004 */
.tm_sec = 00,
.tm_min = 1,
.tm_hour = 23,
.tm_mday = 2,
.tm_mon = 6,
.tm_year = -4-YEAR_BASE,
.tm_wday = 3,
.tm_yday = 183,
.tm_isdst = 1
};
#define YEAR CQ("-004")
#define CENT CQ("-0")
#define Year CQ("04")
const struct test Vecyrzn[] = {
/* Testing fields one at a time, expecting to pass, using a larger
* allowed length than what is needed. */
/* Using tmyrzn for time: */
#define EXP(s) sizeof(s)/sizeof(CHAR)-1, s
{ CQ("%C"), OUTSIZE, EXP(CENT) },
{ CQ("%c"), OUTSIZE, EXP(CQ("Wed Jul 2 23:01:00 ")YEAR) },
{ CQ("%D"), OUTSIZE, EXP(CQ("07/02/")Year) },
{ CQ("%F"), OUTSIZE, EXP(YEAR CQ("-07-02")) },
{ CQ("%x"), OUTSIZE, EXP(CQ("07/02/")Year) },
{ CQ("%y"), OUTSIZE, EXP(Year) },
{ CQ("%Y"), OUTSIZE, EXP(YEAR) },
#undef EXP
};
#undef YEAR
#undef CENT
#undef Year
const struct list ListYr[] = {
{ &tmyrzp, Vecyrzp, sizeof(Vecyrzp)/sizeof(Vecyrzp[0]) },
{ &tmyrzn, Vecyrzn, sizeof(Vecyrzn)/sizeof(Vecyrzn[0]) },
#if YEAR_BASE == 1900
{ &tmyr0, Vecyr0, sizeof(Vecyr0)/sizeof(Vecyr0[0]) },
{ &tmyr1, Vecyr1, sizeof(Vecyr1)/sizeof(Vecyr1[0]) },
#endif
};
/* List of tests to be run */
const struct list List[] = {
{ &tm0, Vec0, sizeof(Vec0)/sizeof(Vec0[0]) },
{ &tm1, Vec1, sizeof(Vec1)/sizeof(Vec1[0]) },
};
#if defined(STUB_getenv_r)
char *
_getenv_r(struct _reent *p, const char *cp) { return getenv(cp); }
#endif
int
main(void)
{
int i, l, errr=0, erro=0, tot=0;
const char *cp;
CHAR out[OUTSIZE];
size_t ret;
/* Set timezone so that %z and %Z tests come out right */
cp = TZ;
if((i=putenv(cp))) {
printf( "putenv(%s) FAILED, ret %d\n", cp, i);
return(-1);
}
if(strcmp(getenv("TZ"),strchr(TZ,'=')+1)) {
printf( "TZ not set properly in environment\n");
return(-2);
}
tzset();
#if defined(VERBOSE)
printf("_timezone=%d, _daylight=%d, _tzname[0]=%s, _tzname[1]=%s\n", _timezone, _daylight, _tzname[0], _tzname[1]);
{
long offset;
__tzinfo_type *tz = __gettzinfo ();
/* The sign of this is exactly opposite the envvar TZ. We
could directly use the global _timezone for tm_isdst==0,
but have to use __tzrule for daylight savings. */
printf("tz->__tzrule[0].offset=%d, tz->__tzrule[1].offset=%d\n", tz->__tzrule[0].offset, tz->__tzrule[1].offset);
}
#endif
/* Run all of the exact-length tests as-given--results should match */
for(l=0; l<sizeof(List)/sizeof(List[0]); l++) {
const struct list *test = &List[l];
for(i=0; i<test->cnt; i++) {
tot++; /* Keep track of number of tests */
ret = strftime(out, test->vec[i].max, test->vec[i].fmt, test->tms);
if(ret != test->vec[i].ret) {
errr++;
fprintf(stderr,
"ERROR: return %d != %d expected for List[%d].vec[%d]\n",
ret, test->vec[i].ret, l, i);
}
if(strncmp(out, test->vec[i].out, test->vec[i].max-1)) {
erro++;
fprintf(stderr,
"ERROR: \"%"SFLG"s\" != \"%"SFLG"s\" expected for List[%d].vec[%d]\n",
out, test->vec[i].out, l, i);
}
}
}
/* Run all of the exact-length tests with the length made too short--expect to
* fail. */
for(l=0; l<sizeof(List)/sizeof(List[0]); l++) {
const struct list *test = &List[l];
for(i=0; i<test->cnt; i++) {
tot++; /* Keep track of number of tests */
ret = strftime(out, test->vec[i].max-1, test->vec[i].fmt, test->tms);
if(ret != 0) {
errr++;
fprintf(stderr,
"ERROR: return %d != %d expected for List[%d].vec[%d]\n",
ret, 0, l, i);
}
/* Almost every conversion puts out as many characters as possible, so
* go ahead and test the output even though have failed. (The test
* times chosen happen to not hit any of the cases that fail this, so it
* works.) */
if(strncmp(out, test->vec[i].out, test->vec[i].max-1-1)) {
erro++;
fprintf(stderr,
"ERROR: \"%"SFLG"s\" != \"%"SFLG"s\" expected for List[%d].vec[%d]\n",
out, test->vec[i].out, l, i);
}
}
}
/* Run all of the special year test cases */
for(l=0; l<sizeof(ListYr)/sizeof(ListYr[0]); l++) {
const struct list *test = &ListYr[l];
for(i=0; i<test->cnt; i++) {
tot++; /* Keep track of number of tests */
ret = strftime(out, test->vec[i].max, test->vec[i].fmt, test->tms);
if(ret != test->vec[i].ret) {
errr++;
fprintf(stderr,
"ERROR: return %d != %d expected for ListYr[%d].vec[%d]\n",
ret, test->vec[i].ret, l, i);
}
if(strncmp(out, test->vec[i].out, test->vec[i].max-1)) {
erro++;
fprintf(stderr,
"ERROR: \"%"SFLG"s\" != \"%"SFLG"s\" expected for ListYr[%d].vec[%d]\n",
out, test->vec[i].out, l, i);
}
}
}
#define STRIZE(f) #f
#define NAME(f) STRIZE(f)
printf(NAME(strftime) "() test ");
if(errr || erro) printf("FAILED %d/%d of", errr, erro);
else printf("passed");
printf(" %d test cases.\n", tot);
return(errr || erro);
}
#endif /* defined(_REGRESSION_TEST) ] */
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