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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:40:15 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-15 19:40:15 +0000 |
commit | 399644e47874bff147afb19c89228901ac39340e (patch) | |
tree | 1c4c0b733f4c16b5783b41bebb19194a9ef62ad1 /man3/mbsinit.3 | |
parent | Initial commit. (diff) | |
download | manpages-399644e47874bff147afb19c89228901ac39340e.tar.xz manpages-399644e47874bff147afb19c89228901ac39340e.zip |
Adding upstream version 6.05.01.upstream/6.05.01
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'man3/mbsinit.3')
-rw-r--r-- | man3/mbsinit.3 | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/man3/mbsinit.3 b/man3/mbsinit.3 new file mode 100644 index 0000000..41a43a4 --- /dev/null +++ b/man3/mbsinit.3 @@ -0,0 +1,118 @@ +'\" t +.\" Copyright (c) Bruno Haible <haible@clisp.cons.org> +.\" +.\" SPDX-License-Identifier: GPL-2.0-or-later +.\" +.\" References consulted: +.\" GNU glibc-2 source code and manual +.\" Dinkumware C library reference http://www.dinkumware.com/ +.\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html +.\" ISO/IEC 9899:1999 +.\" +.TH mbsinit 3 2023-07-20 "Linux man-pages 6.05.01" +.SH NAME +mbsinit \- test for initial shift state +.SH LIBRARY +Standard C library +.RI ( libc ", " \-lc ) +.SH SYNOPSIS +.nf +.B #include <wchar.h> +.PP +.BI "int mbsinit(const mbstate_t *" ps ); +.fi +.SH DESCRIPTION +Character conversion between the multibyte representation and the wide +character representation uses conversion state, of type +.IR mbstate_t . +Conversion of a string uses a finite-state machine; when it is interrupted +after the complete conversion of a number of characters, it may need to +save a state for processing the remaining characters. +Such a conversion +state is needed for the sake of encodings such as ISO-2022 and UTF-7. +.PP +The initial state is the state at the beginning of conversion of a string. +There are two kinds of state: the one used by multibyte to wide character +conversion functions, such as +.BR mbsrtowcs (3), +and the one used by wide +character to multibyte conversion functions, such as +.BR wcsrtombs (3), +but they both fit in a +.IR mbstate_t , +and they both have the same +representation for an initial state. +.PP +For 8-bit encodings, all states are equivalent to the initial state. +For multibyte encodings like UTF-8, EUC-*, BIG5, or SJIS, the wide character +to multibyte conversion functions never produce non-initial states, but the +multibyte to wide-character conversion functions like +.BR mbrtowc (3) +do +produce non-initial states when interrupted in the middle of a character. +.PP +One possible way to create an +.I mbstate_t +in initial state is to set it to zero: +.PP +.in +4n +.EX +mbstate_t state; +memset(&state, 0, sizeof(state)); +.EE +.in +.PP +On Linux, the following works as well, but might generate compiler warnings: +.PP +.in +4n +.EX +mbstate_t state = { 0 }; +.EE +.in +.PP +The function +.BR mbsinit () +tests whether +.I *ps +corresponds to an +initial state. +.SH RETURN VALUE +.BR mbsinit () +returns nonzero if +.I *ps +is an initial state, or if +.I ps +is NULL. +Otherwise, it returns 0. +.SH ATTRIBUTES +For an explanation of the terms used in this section, see +.BR attributes (7). +.TS +allbox; +lbx lb lb +l l l. +Interface Attribute Value +T{ +.na +.nh +.BR mbsinit () +T} Thread safety MT-Safe +.TE +.sp 1 +.SH STANDARDS +C11, POSIX.1-2008. +.SH HISTORY +POSIX.1-2001, C99. +.SH NOTES +The behavior of +.BR mbsinit () +depends on the +.B LC_CTYPE +category of the +current locale. +.SH SEE ALSO +.BR mbrlen (3), +.BR mbrtowc (3), +.BR mbsrtowcs (3), +.BR wcrtomb (3), +.BR wcsrtombs (3) |