NAME
mbtowc - convert a multibyte sequence to a wide character
SYNOPSIS
#include <stdlib.h> int mbtowc(wchar_t *pwc, const char *s, size_t n);
DESCRIPTION
The main case for this function is when s is not NULL and pwc is not
NULL. In this case, the mbtowc() function inspects at most n bytes of
the multibyte string starting at s, extracts the next complete
multibyte character, converts it to a wide character and stores it at
*pwc. It updates an internal shift state known only to the mbtowc()
function. If s does not point to a null byte ('\0'), it returns the
number of bytes that were consumed from s, otherwise it returns 0.
If the n bytes starting at s do not contain a complete multibyte
character, or if they contain an invalid multibyte sequence, mbtowc()
returns -1. This can happen even if n >= MB_CUR_MAX, if the multibyte
string contains redundant shift sequences.
A different case is when s is not NULL but pwc is NULL. In this case,
the mbtowc() function behaves as above, except that it does not store
the converted wide character in memory.
A third case is when s is NULL. In this case, pwc and n are ignored.
The mbtowc() function resets the shift state, only known to this
function, to the initial state, and returns nonzero if the encoding has
nontrivial shift state, or zero if the encoding is stateless.
RETURN VALUE
If s is not NULL, the mbtowc() function returns the number of consumed bytes starting at s, or 0 if s points to a null byte, or -1 upon failure. If s is NULL, the mbtowc() function returns nonzero if the encoding has nontrivial shift state, or zero if the encoding is stateless.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). Interface Attribute Value mbtowc() Thread safety MT-Unsafe race
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99.
NOTES
The behavior of mbtowc() depends on the LC_CTYPE category of the current locale. This function is not multithread safe. The function mbrtowc(3) provides a better interface to the same functionality.
SEE ALSO
MB_CUR_MAX(3), mblen(3), mbrtowc(3), mbstowcs(3), wcstombs(3), wctomb(3)
COLOPHON
This page is part of release 4.09 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
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