281 lines
6.9 KiB
Groff
281 lines
6.9 KiB
Groff
.\" Copyright (c) 2011 The FreeBSD Foundation
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.\" All rights reserved.
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.\"
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.\" This documentation was written by David Chisnall under sponsorship from
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.\" the FreeBSD Foundation.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd September 17, 2011
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.Dt XLOCALE 3
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.Os
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.Sh NAME
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.Nm xlocale
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.Nd Thread-safe extended locale support
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In xlocale.h
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.Sh DESCRIPTION
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The extended locale support includes a set of functions for setting
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thread-local locales,
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as well convenience functions for performing locale-aware
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calls with a specified locale.
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.Pp
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The core of the xlocale API is the
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.Fa locale_t
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type.
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This is an opaque type encapsulating a locale.
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Instances of this can be either set as the locale for a specific thread or
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passed directly to the
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.Fa _l
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suffixed variants of various standard C functions.
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Two special
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.Fa locale_t
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values are available:
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.Bl -bullet -offset indent
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.It
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NULL refers to the current locale for the thread,
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or to the global locale if no locale has been set for this thread.
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.It
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LC_GLOBAL_LOCALE refers to the global locale.
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.El
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.Pp
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The global locale is the locale set with the
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.Xr setlocale 3
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function.
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.Sh SEE ALSO
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.Xr duplocale 3 ,
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.Xr freelocale 3 ,
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.Xr localeconv 3 ,
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.Xr newlocale 3 ,
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.Xr querylocale 3 ,
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.Xr uselocale 3
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.Sh CONVENIENCE FUNCTIONS
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The xlocale API includes a number of
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.Fa _l
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suffixed convenience functions.
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These are variants of standard C functions
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that have been modified to take an explicit
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.Fa locale_t
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parameter as the final argument or, in the case of variadic functions,
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as an additional argument directly before the format string.
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Each of these functions accepts either NULL or LC_GLOBAL_LOCALE.
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In these functions, NULL refers to the C locale,
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rather than the thread's current locale.
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If you wish to use the thread's current locale,
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then use the unsuffixed version of the function.
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.Pp
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These functions are exposed by including
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.In xlocale.h
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.Em after
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including the relevant headers for the standard variant.
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For example, the
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.Xr strtol_l 3
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function is exposed by including
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.In xlocale.h
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after
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.In stdlib.h ,
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which defines
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.Xr strtol 3 .
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.Pp
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For reference,
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a complete list of the locale-aware functions that are available in this form,
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along with the headers that expose them, is provided here:
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.Bl -tag -width "<monetary.h> "
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.It In wctype.h
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.Xr iswalnum_l 3 ,
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.Xr iswalpha_l 3 ,
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.Xr iswcntrl_l 3 ,
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.Xr iswctype_l 3 ,
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.Xr iswdigit_l 3 ,
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.Xr iswgraph_l 3 ,
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.Xr iswlower_l 3 ,
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.Xr iswprint_l 3 ,
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.Xr iswpunct_l 3 ,
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.Xr iswspace_l 3 ,
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.Xr iswupper_l 3 ,
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.Xr iswxdigit_l 3 ,
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.Xr towlower_l 3 ,
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.Xr towupper_l 3 ,
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.Xr wctype_l 3 ,
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.It In ctype.h
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.Xr digittoint_l 3 ,
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.Xr isalnum_l 3 ,
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.Xr isalpha_l 3 ,
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.Xr isblank_l 3 ,
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.Xr iscntrl_l 3 ,
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.Xr isdigit_l 3 ,
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.Xr isgraph_l 3 ,
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.Xr ishexnumber_l 3 ,
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.Xr isideogram_l 3 ,
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.Xr islower_l 3 ,
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.Xr isnumber_l 3 ,
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.Xr isphonogram_l 3 ,
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.Xr isprint_l 3 ,
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.Xr ispunct_l 3 ,
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.Xr isrune_l 3 ,
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.Xr isspace_l 3 ,
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.Xr isspecial_l 3 ,
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.Xr isupper_l 3 ,
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.Xr isxdigit_l 3 ,
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.Xr tolower_l 3 ,
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.Xr toupper_l 3
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.It In inttypes.h
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.Xr strtoimax_l 3 ,
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.Xr strtoumax_l 3 ,
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.Xr wcstoimax_l 3 ,
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.Xr wcstoumax_l 3
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.It In langinfo.h
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.Xr nl_langinfo_l 3
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.It In monetary.h
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.Xr strfmon_l 3
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.It In stdio.h
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.Xr asprintf_l 3 ,
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.Xr fprintf_l 3 ,
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.Xr fscanf_l 3 ,
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.Xr printf_l 3 ,
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.Xr scanf_l 3 ,
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.Xr snprintf_l 3 ,
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.Xr sprintf_l 3 ,
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.Xr sscanf_l 3 ,
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.Xr vasprintf_l 3 ,
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.Xr vfprintf_l 3 ,
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.Xr vfscanf_l 3 ,
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.Xr vprintf_l 3 ,
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.Xr vscanf_l 3 ,
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.Xr vsnprintf_l 3 ,
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.Xr vsprintf_l 3 ,
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.Xr vsscanf_l 3
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.It In stdlib.h
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.Xr atof_l 3 ,
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.Xr atoi_l 3 ,
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.Xr atol_l 3 ,
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.Xr atoll_l 3 ,
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.Xr mblen_l 3 ,
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.Xr mbstowcs_l 3 ,
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.Xr mbtowc_l 3 ,
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.Xr strtod_l 3 ,
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.Xr strtof_l 3 ,
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.Xr strtol_l 3 ,
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.Xr strtold_l 3 ,
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.Xr strtoll_l 3 ,
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.Xr strtoq_l 3 ,
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.Xr strtoul_l 3 ,
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.Xr strtoull_l 3 ,
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.Xr strtouq_l 3 ,
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.Xr wcstombs_l 3 ,
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.Xr wctomb_l 3
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.It In string.h
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.Xr strcoll_l 3 ,
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.Xr strxfrm_l 3 ,
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.Xr strcasecmp_l 3 ,
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.Xr strcasestr_l 3 ,
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.Xr strncasecmp_l 3
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.It In time.h
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.Xr strftime_l 3
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.Xr strptime_l 3
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.It In wchar.h
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.Xr btowc_l 3 ,
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.Xr fgetwc_l 3 ,
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.Xr fgetws_l 3 ,
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.Xr fputwc_l 3 ,
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.Xr fputws_l 3 ,
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.Xr fwprintf_l 3 ,
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.Xr fwscanf_l 3 ,
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.Xr getwc_l 3 ,
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.Xr getwchar_l 3 ,
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.Xr mbrlen_l 3 ,
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.Xr mbrtowc_l 3 ,
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.Xr mbsinit_l 3 ,
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.Xr mbsnrtowcs_l 3 ,
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.Xr mbsrtowcs_l 3 ,
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.Xr putwc_l 3 ,
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.Xr putwchar_l 3 ,
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.Xr swprintf_l 3 ,
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.Xr swscanf_l 3 ,
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.Xr ungetwc_l 3 ,
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.Xr vfwprintf_l 3 ,
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.Xr vfwscanf_l 3 ,
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.Xr vswprintf_l 3 ,
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.Xr vswscanf_l 3 ,
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.Xr vwprintf_l 3 ,
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.Xr vwscanf_l 3 ,
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.Xr wcrtomb_l 3 ,
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.Xr wcscoll_l 3 ,
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.Xr wcsftime_l 3 ,
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.Xr wcsnrtombs_l 3 ,
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.Xr wcsrtombs_l 3 ,
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.Xr wcstod_l 3 ,
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.Xr wcstof_l 3 ,
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.Xr wcstol_l 3 ,
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.Xr wcstold_l 3 ,
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.Xr wcstoll_l 3 ,
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.Xr wcstoul_l 3 ,
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.Xr wcstoull_l 3 ,
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.Xr wcswidth_l 3 ,
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.Xr wcsxfrm_l 3 ,
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.Xr wctob_l 3 ,
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.Xr wcwidth_l 3 ,
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.Xr wprintf_l 3 ,
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.Xr wscanf_l 3
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.It In wctype.h
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.Xr iswblank_l 3 ,
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.Xr iswhexnumber_l 3 ,
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.Xr iswideogram_l 3 ,
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.Xr iswnumber_l 3 ,
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.Xr iswphonogram_l 3 ,
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.Xr iswrune_l 3 ,
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.Xr iswspecial_l 3 ,
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.Xr nextwctype_l 3 ,
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.Xr towctrans_l 3 ,
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.Xr wctrans_l 3
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.It In xlocale.h
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.Xr localeconv_l 3
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.El
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.Sh STANDARDS
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The functions
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conform to
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.St -p1003.1-2008 .
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.Sh HISTORY
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The xlocale APIs first appeared in Darwin 8.0.
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This implementation was written by David Chisnall,
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under sponsorship from the FreeBSD Foundation and first appeared in
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.Fx 9.1 .
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.Sh CAVEATS
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The
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.Xr setlocale 3
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function, and others in the family, refer to the global locale.
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Other functions that depend on the locale, however,
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will take the thread-local locale if one has been set.
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This means that the idiom of setting the locale using
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.Xr setlocale 3 ,
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calling a locale-dependent function,
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and then restoring the locale will not
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have the expected behavior if the current thread has had a locale set using
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.Xr uselocale 3 .
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You should avoid this idiom and prefer to use the
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.Fa _l
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suffixed versions instead.
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