1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
3 .\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
4 .\" This is free documentation; you can redistribute it and/or
5 .\" modify it under the terms of the GNU General Public License as
6 .\" published by the Free Software Foundation; either version 2 of
7 .\" the License, or (at your option) any later version.
10 .\" References consulted:
11 .\" GNU glibc-2 source code and manual
12 .\" Dinkumware C library reference http://www.dinkumware.com/
13 .\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
16 .TH MBLEN 3 1999-07-25 "GNU" "Linux Programmer's Manual"
18 mblen \- determine number of bytes in next multibyte character
21 .B #include <stdlib.h>
23 .BI "int mblen(const char *" s ", size_t " n );
26 If \fIs\fP is not a NULL pointer, the
28 function inspects at most
29 \fIn\fP bytes of the multibyte string starting at \fIs\fP and extracts the
30 next complete multibyte character.
31 It uses a static anonymous shift state known only to the
34 If the multibyte character is not the null wide
35 character, it returns the number of bytes that were consumed from \fIs\fP.
36 If the multibyte character is the null wide character, it returns 0.
38 If the \fIn\fP bytes starting at \fIs\fP do not contain a complete multibyte
42 This can happen even if
43 \fIn\fP is greater than or equal to \fIMB_CUR_MAX\fP,
44 if the multibyte string contains redundant shift sequences.
46 If the multibyte string starting at \fIs\fP contains an invalid multibyte
47 sequence before the next complete character,
51 If \fIs\fP is a NULL pointer, the
54 .\" The Dinkumware doc and the Single UNIX specification say this, but
55 .\" glibc doesn't implement this.
56 resets the shift state, known to only this function, to the initial state, and
57 returns nonzero if the encoding has nontrivial shift state, or zero if the
58 encoding is stateless.
62 function returns the number of
63 bytes parsed from the multibyte
64 sequence starting at \fIs\fP, if a non-null wide character was recognized.
65 It returns 0, if a null wide character was recognized.
67 invalid multibyte sequence was encountered or if it couldn't parse a complete
81 provides a better interface to the same