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authorUlrich Drepper <drepper@redhat.com>1996-09-20 01:58:09 +0000
committerUlrich Drepper <drepper@redhat.com>1996-09-20 01:58:09 +0000
commitec4b0518a39f46354c0d75b4c3e2f507c9af261e (patch)
tree642ad0e74e2222c3750073d7827cfc0aead1372e /manual
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update from main archive 960919cvs/libc-960920
Thu Sep 19 21:50:55 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/posix/gettimeofday.c (__gettimeofday): Use localtime_r instead of localtime. Reported by Matthias Urlichs. * shlib-versions: Remove version number for libcrypt. * features.h: Define __USE_REENTRANT if _REENTRANT or _THREAD_SAFE. * libc-symbols.h: Define _REENTRANT while compiling libc. * sysdeps/unix/sysv/linux/i386/sysdep.S (__errno_location): Define even if !_LIBC_REENTRANT. * sysdeps/unix/sysv/linux/i386/sysdep.S (__errno_location): Likewise. * sysdeps/posix/cuserid.h: Remove prototype for geteuid(). De-ANSI-fy. * MakeTAGS ($P/libc.pot): Generate correctly formed header. * po/header.pot: Correct title line. * po/nl.po: Update. Thu Sep 19 18:59:55 1996 Ulrich Drepper <drepper@cygnus.com> * Makeconfig (soversions.mk): Prefer shared lib version numbers is add ons over version in libc itself. * sysdeps/unix/sysv/linux/i386/sysdep.S: Include <sysdep.h>. * sysdeps/unix/sysv/linux/i386/sysdep.h: Prevent multiple inclusion. * libio/iofgets.c: Use __flockfile and __funlockfile instead of _IO_flockfile and _IO_funlockfile resp. * locale/categories.def: Partly support for correct `era' handling in LC_TIME category. * locale/langinfo.h: Likewise. * locale/programs/ld-time.c: Likewise. * locale/localeinfo.h: Change comment a bit. * malloc/memalign.c: Don't use goto, not necessary anymore. 1996-09-18 Paul Eggert <eggert@twinsun.com> * time/mktime.c (ydhms_tm_diff): Work correctly even if year is negative, or if time_t is unsigned. * time/strftime.c (tm_diff): Work correctly even if tm_year is near INT_MIN. Tue Sep 17 16:14:34 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/m68k/fpu/__math.h (__inline_mathop): Changed to generate all three versions of the math function. (__inline_mathopf, __inline_mathopl): Removed. (__inline_functions): New temporary definition containing all non-trivial inline functions. Wed Sep 18 00:25:41 1996 Ulrich Drepper <drepper@cygnus.com> * time/strftime.c (strftime): The T_FMT_AMPM string may be empty. Tue Sep 17 20:27:18 1996 Ulrich Drepper <drepper@cygnus.com> * math/Makefile (extra-libs-others): Use $(extra-libs) instead of $(extra-libc). Tue Sep 17 17:09:44 1996 Ulrich Drepper <drepper@cygnus.com> * sysdeps/stub/fpu_control.h: Correct end of file comment. Tue Sep 17 05:39:18 1996 Ulrich Drepper <drepper@cygnus.com> * stdio-common/bug3.c, stdio-common/bug4.c, stdio-common/bug5.c, stdio-common/test-popen.c: Remove temporary files after test. * stdio-common/bug5.c: Use `system' instead of `execlp'. Patches by Andreas Jaeger. * stdio-common/bug5.c: Create string for `system' argument to make sure the input and output file names are really correct. Sun Sep 15 12:46:44 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * configure.in: If $os contains a hyphen add the part before the hyphen to $ostry. Sun Sep 15 18:14:02 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/m68k/fpu/__math.h (__ieee754_pow, __ieee754_powf, __ieee754_powl): Rename local variable i to __i. (__ieee754_atan2, __ieee754_atan2f, __ieee754_atan2l): New inline functions. * sysdeps/m68k/fpu/e_atan2.c, sysdeps/m68k/fpu/e_atan2f.c, sysdeps/m68k/fpu/e_atan2l.c: New files. 1996-09-15 Paul Eggert <eggert@twinsun.com> * manual/time.texi: Change `range X to Y' to `range X through Y', to avoid ambiguity in English. (strftime): Numbers that do not have a range indicated are not padded. Describe E and O modifiers. %g, %G, %u: New formats. %C, %y, %Y: Describe behavior on negative years. %e: Fix typo (was labeled %d). %l, %V: Fix typo in range. %M, %S, %U, %w, %W: Give ranges. %p: Clarify how noon and midnight are handled for AM and PM. %s: Clarify leap second handling. %r: Now locale-defined. %C, %D, %e, %h, %n, %r, %t, %T: Say that they are POSIX.2 extensions. %z: Say that it is a GNU extension. %Z: Wording fix. * time/strftime.c: (strftime): %V: Fix mishandling of week numbers near year boundaries. %g, %G: New formats (suggested by Arthur David Olson). %U, %W: Use inline expression instead of `week' function. %C, %y: Handle negative years portably. %C, %Y: Use width 1, since values can be arbitrarily wide. %r: Use T_FMT_AMPM format if _NL_CURRENT is defined. %u: New Posix.2 format. %w: Width is 1, not 2. (iso_week_days): New function, for %V, %G, %g. (week): Remove; it didn't handle %V correctly. (__isleap): New macro. (mbsinit): Use arg, to pacify GCC -Wall. 1996-09-13 Paul Eggert <eggert@twinsun.com> * time/strftime.c (strftime): If using the GNU C library, do not bother to check for multibyte encodings, since they're safe in formats. Otherwise: - Check for multibyte encodings when encountering any character that is not in the basic execution character set of the C Standard. - Use mbrlen (if available) instead of mblen, to avoid modifying mblen's internal state. - Do not assume that '%' cannot appear as the first character of a multibyte character sequence, since this is possible when not in the initial shift state. (HAVE_MBRLEN, MULTIBYTE_IS_FORMAT_SAFE): Define if _LIBC is defined. (DO_MULTIBYTE): New macro. (<ctype.h>): Do not include. (<wchar.h>): Include if HAVE_MBRLEN. (mbstate_t, mbrlen, mbsinit): Define if ! HAVE_MBRLEN. (mbstate_zero): New constant. 1996-09-12 Paul Eggert <eggert@twinsun.com> * time/strftime.c (strftime): Use an empty zone if it can't be determined; POSIX.2 requires this. Use plain `int' for pad and modifier (which now contain char value). Use plain `int' for number_value, to print negative values correctly. Use plain `int' for digits; there was no need to make it unsigned. Initialize subfmt consistently. Remove incorrect code for %EC and %Ey; they aren't implemented yet. For %O, if there is no alternate digit, output Ascii instead of "". Output the `%' of an unknown format; this is most likely the right thing to do if a multibyte string has been misparsed. Thu Sep 12 23:23:13 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * stdio-common/scanf7.c (main): Remove extra conversion from printf format string. Thu Sep 12 23:01:16 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * stdlib/test-canon.c (tests): Rename structure member from errno to error, all uses changed. Thu Sep 12 20:08:06 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/m68k/fpu/__math.h (__ldexp, __ldexpf, __ldexpl): Removed. * sysdeps/m68k/fpu/s_ldexp.c, sysdeps/m68k/fpu/s_ldexpf.c, sysdeps/m68k/fpu/s_ldexpl.c: Removed, use generic implementation instead. * sysdeps/m68k/fpu/s_scalbn.c, sysdeps/m68k/fpu/s_scalbnf.c, sysdeps/m68k/fpu/s_scalbnl.c: Replaced with old contents of s_ldexp.c, s_ldexpf.c and s_ldexpl.c, resp., suitably adpted. * sysdeps/m68k/fpu/__math.h (__frexp, __frexpf, __frexpl): Return value must be in [0.5, 1), not [1, 2). Reported by Chris Lawrence. (__ilogb, __ilogbf, __ilogbl): Check for argument being zero. (__scalbn, __scalbnf, __scalbnl): Use second argument directly. Thu Sep 12 19:59:24 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/libm-ieee754/e_acoshl.c: Fix typos. * sysdeps/libm-ieee754/s_cbrtl.c: Remove unused variable. Thu Sep 12 19:59:24 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/libm-ieee754/e_acoshl.c: Fix typos. * sysdeps/libm-ieee754/s_cbrtl.c: Remove unused variable. Thu Sep 12 19:56:07 1996 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * inet/herrno.c (__h_errno_location): Fix return type. Tue Sep 17 10:51:58 1996 Thomas Bushnell, n/BSG <thomas@gnu.ai.mit.edu> * malloc/memalign.c (memalign): Only acquire __libc_malloc_lock for actual modifications to global state. Fri Sep 13 01:21:36 1996 Thomas Bushnell, n/BSG <thomas@gnu.ai.mit.edu> * sysdeps/mach/Makefile (includes): Add -I$(common-objpfx)mach/. * sysdeps/mach/hurd/Makefile (includes): Add -I$(common-objpfx)hurd/. Reported by Marcus Daniels. * sysdeps/generic/schedbits.h (struct sched_param): Renamed from struct sched_params. * sysdeps/stub/sched_setp.c (__sched_setparam): struct sched_params -> struct sched_param. * sysdeps/stub/sched_getp.c (__sched_getparam): Likewise. * sysdeps/stub/sched_sets.c (__sched_setscheduler): Likewise. Thu Sep 12 23:58:25 1996 Thomas Bushnell, n/BSG <thomas@gnu.ai.mit.edu> * sysdeps/mach/libc-lock.h (__libc_cleanup_region_start): Fix syntax error. * stdio-common/Makefile: Put lockfile in routines unconditionally. Define _MT_SAFE_IO if using for libio and compiling reentrant libc. * stdio-common/vfprintf.c (__flockfile, __funlockfile): Declare this always, not just if _LIBC_REENTRANT. (__funlockfile): Don't use weak_extern for this one; __libc_cleanup_region_end might be defined and the use of __funlockfile can't be protected the way the use of __flockfile can be. * sched.h: New file. Helper to access posix/sched.h. Thu Sep 12 12:33:52 1996 Thomas Bushnell, n/BSG <thomas@gnu.ai.mit.edu> * sysdeps/mach/hurd/dl-cache.c: Delete second copy of file accidentally added on. * sysdeps/stub/intr-msg.h: New file. * stdio-common/vfprintf.c: Include <libc-lock.h>. * stdio-common/vfscanf.c: Include <libc-lock.h>. * sysdeps/mach/libc-lock.h (__libc_cleanup_region_start): New macro. (__libc_cleanup_region_end): New macro.
Diffstat (limited to 'manual')
-rw-r--r--manual/time.texi171
1 files changed, 114 insertions, 57 deletions
diff --git a/manual/time.texi b/manual/time.texi
index 9da23fbfb3..18224a5520 100644
--- a/manual/time.texi
+++ b/manual/time.texi
@@ -465,33 +465,34 @@ contains at least the following members, which can appear in any order:
@table @code
@item int tm_sec
This is the number of seconds after the minute, normally in the range
-@code{0} to @code{59}. (The actual upper limit is @code{60}, to allow
+@code{0} through @code{59}. (The actual upper limit is @code{60}, to allow
for leap seconds if leap second support is available.)
@cindex leap second
@item int tm_min
-This is the number of minutes after the hour, in the range @code{0} to
+This is the number of minutes after the hour, in the range @code{0} through
@code{59}.
@item int tm_hour
-This is the number of hours past midnight, in the range @code{0} to
+This is the number of hours past midnight, in the range @code{0} through
@code{23}.
@item int tm_mday
-This is the day of the month, in the range @code{1} to @code{31}.
+This is the day of the month, in the range @code{1} through @code{31}.
@item int tm_mon
-This is the number of months since January, in the range @code{0} to
+This is the number of months since January, in the range @code{0} through
@code{11}.
@item int tm_year
This is the number of years since @code{1900}.
@item int tm_wday
-This is the number of days since Sunday, in the range @code{0} to @code{6}.
+This is the number of days since Sunday, in the range @code{0} through
+@code{6}.
@item int tm_yday
-This is the number of days since January 1, in the range @code{0} to
+This is the number of days since January 1, in the range @code{0} through
@code{365}.
@item int tm_isdst
@@ -617,6 +618,7 @@ does so. @xref{Time Zone Functions}.
@comment time.h
@comment ANSI
+@comment POSIX.2
@deftypefun size_t strftime (char *@var{s}, size_t @var{size}, const char *@var{template}, const struct tm *@var{brokentime})
This function is similar to the @code{sprintf} function (@pxref{Formatted
Input}), but the conversion specifications that can appear in the format
@@ -626,9 +628,9 @@ time conversion (@pxref{Locales}).
Ordinary characters appearing in the @var{template} are copied to the
output string @var{s}; this can include multibyte character sequences.
-Conversion specifiers are introduced by a @samp{%} character. Now can
-follow an optional flag which can be one of the following. These flags
-only affect the output of numbers:
+Conversion specifiers are introduced by a @samp{%} character, followed
+by an optional flag which can be one of the following. These flags,
+which are GNU extensions, affect only the output of numbers:
@table @code
@item _
@@ -638,9 +640,31 @@ The number is padded with spaces.
The number is not padded at all.
@end table
-The default action is to pad the number with zeros. Following to the
-flag comes the format specifier. The whole @samp{%} sequence is
-replaced in the output string as follows:
+The default action is to pad the number with zeros to keep it a constant
+width. Numbers that do not have a range indicated below are never
+padded, since there is no natural width for them.
+
+An optional modifier can follow the optional flag. The modifiers, which
+are POSIX.2 extensions, are:
+
+@table @code
+@item E
+Use the locale's alternate representation for date and time. This
+modifier applies to the @code{%c}, @code{%C}, @code{%x}, @code{%X},
+@code{%y} and @code{%Y} format specifiers. In a Japanese locale, for
+example, @code{%Ex} might yield a date format based on the Japanese
+Emperors' reigns.
+
+@item O
+Use the locale's alternate numeric symbols for numbers. This modifier
+applies only to numeric format specifiers.
+@end table
+
+A modifier is ignored if no alternate representation is available.
+
+The conversion specifier ends with a format specifier taken from the
+following list. The whole @samp{%} sequence is replaced in the output
+string as follows:
@table @code
@item %a
@@ -659,19 +683,38 @@ The full month name according to the current locale.
The preferred date and time representation for the current locale.
@item %C
-The century of the year.
+The century of the year. This is equivalent to the greatest integer not
+greater than the year divided by 100.
+
+This format is a POSIX.2 extension.
@item %d
-The day of the month as a decimal number (range @code{01} to @code{31}).
+The day of the month as a decimal number (range @code{01} through @code{31}).
@item %D
The date using the format @code{%m/%d/%y}.
-This format is a GNU extension.
+This format is a POSIX.2 extension.
-@item %d
+@item %e
The day of the month like with @code{%d}, but padded with blank (range
-@code{ 1} to @code{31}).
+@code{ 1} through @code{31}).
+
+This format is a POSIX.2 extension.
+
+@item %g
+The year corresponding to the ISO week number, but without the century
+(range @code{00} through @code{99}). This has the same format and value
+as @code{%y}, except that if the ISO week number (see @code{%V}) belongs
+to the previous or next year, that year is used instead.
+
+This format is a GNU extension.
+
+@item %G
+The year corresponding to the ISO week number. This has the same format
+and value as @code{%Y}, except that if the ISO week number (see
+@code{%V}) belongs to the previous or next year, that year is used
+instead.
This format is a GNU extension.
@@ -679,50 +722,51 @@ This format is a GNU extension.
The abbreviated month name according to the current locale. The action
is the same as for @code{%b}.
-This format is a GNU extension.
+This format is a POSIX.2 extension.
@item %H
-The hour as a decimal number, using a 24-hour clock (range @code{00} to
+The hour as a decimal number, using a 24-hour clock (range @code{00} through
@code{23}).
@item %I
-The hour as a decimal number, using a 12-hour clock (range @code{01} to
+The hour as a decimal number, using a 12-hour clock (range @code{01} through
@code{12}).
@item %j
-The day of the year as a decimal number (range @code{001} to @code{366}).
+The day of the year as a decimal number (range @code{001} through @code{366}).
@item %k
The hour as a decimal number, using a 24-hour clock like @code{%H}, but
-padded with blank (range @code{ 0} to @code{23}).
+padded with blank (range @code{ 0} through @code{23}).
This format is a GNU extension.
@item %l
The hour as a decimal number, using a 12-hour clock like @code{%I}, but
-padded with blank (range @code{ 0} to @code{12}).
+padded with blank (range @code{ 1} through @code{12}).
This format is a GNU extension.
@item %m
-The month as a decimal number (range @code{01} to @code{12}).
+The month as a decimal number (range @code{01} through @code{12}).
@item %M
-The minute as a decimal number.
+The minute as a decimal number (range @code{00} through @code{59}).
@item %n
A single @samp{\n} (newline) character.
-This format is a GNU extension.
+This format is a POSIX.2 extension.
@item %p
-Either @samp{am} or @samp{pm}, according to the given time value; or the
-corresponding strings for the current locale.
+Either @samp{AM} or @samp{PM}, according to the given time value; or the
+corresponding strings for the current locale. Noon is treated as
+@samp{PM} and midnight as @samp{AM}.
@item %r
-The time in decinal numbers using the format @code{%I:%M:%S %p}.
+The complete time using the AM/PM format of the current locale.
-This format is a GNU extension.
+This format is a POSIX.2 extension.
@item %R
The hour and minute in decimal numbers using the format @code{%H:%M}.
@@ -730,47 +774,58 @@ The hour and minute in decimal numbers using the format @code{%H:%M}.
This format is a GNU extension.
@item %s
-The seconds since the epoch, i.e., 1970-01-01 00:00:00 UTC. Note
-that this value is the number of seconds between the epoch and the
-current date as defined by the @code{localtime} system call.
+The number of seconds since the epoch, i.e., since 1970-01-01 00:00:00 UTC.
+Leap seconds are not counted unless leap second support is available.
This format is a GNU extension.
@item %S
-The second as a decimal number.
+The second as a decimal number (range @code{00} through @code{60}).
@item %t
A single @samp{\t} (tabulator) character.
-This format is a GNU extension.
+This format is a POSIX.2 extension.
@item %T
The time using decimal numbers using the format @code{%H:%M:%S}.
-This format is a GNU extension.
+This format is a POSIX.2 extension.
+
+@item %u
+The day of the week as a decimal number (range @code{1} through
+@code{7}), Monday being @code{1}.
+
+This format is a POSIX.2 extension.
@item %U
-The week number of the current year as a decimal number, starting with
-the first Sunday as the first day of the first week. All days preceding
-the first Sunday in the year are considered to be in week @code{0}.
+The week number of the current year as a decimal number (range @code{00}
+through @code{53}), starting with the first Sunday as the first day of
+the first week. Days preceding the first Sunday in the year are
+considered to be in week @code{00}.
@item %V
-The @w{ISO 8601:1988} week number as a decimal number (range @code{00}
-to @code{53}). ISO weeks start with Monday and end with Sunday. Week
-01 of a year is the first week which has the majority of its days in
-that year; this is equivalent to the week containing the year's first
-Thursday, and it is also equivalent to the week containing January 4.
-Week 01 of a year can contain days from the previous year. 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.
+The @w{ISO 8601:1988} week number as a decimal number (range @code{01}
+through @code{53}). ISO weeks start with Monday and end with Sunday.
+Week @code{01} of a year is the first week which has the majority of its
+days in that year; this is equivalent to the week containing the year's
+first Thursday, and it is also equivalent to the week containing January
+4. Week @code{01} of a year can contain days from the previous year.
+The week before week @code{01} of a year is the last week (@code{52} or
+@code{53}) of the previous year even if it contains days from the new
+year.
+
+This format is a POSIX.2 extension.
@item %w
-The day of the week as a decimal number, Sunday being @code{0}.
+The day of the week as a decimal number (range @code{0} through
+@code{6}), Sunday being @code{0}.
@item %W
-The week number of the current year as a decimal number, starting with
-the first Monday as the first day of the first week. All days preceding
-the first Monday in the year are considered to be in week @code{0}.
+The week number of the current year as a decimal number (range @code{00}
+through @code{53}), starting with the first Monday as the first day of
+the first week. All days preceding the first Monday in the year are
+considered to be in week @code{00}.
@item %x
The preferred date representation for the current locale, but without the
@@ -780,20 +835,22 @@ time.
The preferred time representation for the current locale, but with no date.
@item %y
-The year as a decimal number, but without a century (range @code{00} to
-@code{99}).
+The year without a century as a decimal number (range @code{00} through
+@code{99}). This is equivalent to the year modulo 100.
@item %Y
-The year as a decimal number, including the century.
+The year as a decimal number, using the Gregorian calendar. Years
+before the year @code{1} are numbered @code{0}, @code{-1}, and so on.
@item %z
@w{RFC 822}/@w{ISO 8601:1988} style numeric time zone (e.g.,
@code{-0600} or @code{+0100}), or nothing if no time zone is
determinable.
+This format is a GNU extension.
+
@item %Z
-The time zone or name or abbreviation (empty if the time zone can't be
-determined).
+The time zone abbreviation (empty if the time zone can't be determined).
@item %%
A literal @samp{%} character.