multibyte man page on 4.4BSD

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MULTIBYTE(3)		 BSD Library Functions Manual		  MULTIBYTE(3)

     mblen, mbstowcs, mbtowc, wcstombs, wctomb — multibyte character support
     for C

     #include <stdlib.h>

     mblen(const char *mbchar, int nbytes);

     mbstowcs(wchar_t *wcstring, const char *mbstring, size_t nwchars);

     mbtowc(wchar_t *wcharp, const char *mbchar, size_t nbytes);

     wcstombs(char *mbstring, const wchar_t *wcstring, size_t nbytes);

     wctomb(char *mbchar, wchar_t wchar);

     The basic elements of some written natural languages such as Chinese can‐
     not be represented uniquely with single C chars.  The C standard supports
     two different ways of dealing with extended natural language encodings,
     wide characters and multibyte characters.	Wide characters are an inter‐
     nal representation which allows each basic element to map to a single
     object of type wchar_t.  Multibyte characters are used for input and out‐
     put and code each basic element as a sequence of C chars.	Individual
     basic elements may map into one or more (up to MB_CHAR_MAX) bytes in a
     multibyte character.

     The current locale (setlocale(3)) governs the interpretation of wide and
     multibyte characters.  The locale category LC_CTYPE specifically controls
     this interpretation.  The wchar_t type is wide enough to hold the largest
     value in the wide character representations for all locales.

     Multibyte strings may contain ‘shift’ indicators to switch to and from
     particular modes within the given representation.	If explicit bytes are
     used to signal shifting, these are not recognized as separate characters
     but are lumped with a neighboring character.  There is always a distin‐
     guished ‘initial’ shift state.  The mbstowcs() and wcstombs() functions
     assume that multibyte strings are interpreted starting from the initial
     shift state.  The mblen(), mbtowc() and wctomb() functions maintain
     static shift state internally.  A call with a null mbchar pointer returns
     nonzero if the current locale requires shift states, zero otherwise; if
     shift states are required, the shift state is reset to the initial state.
     The internal shift states are undefined after a call to setlocale() with
     the LC_CTYPE or LC_ALL categories.

     For convenience in processing, the wide character with value 0 (the null
     wide character) is recognized as the wide character string terminator,
     and the character with value 0 (the null byte) is recognized as the
     multibyte character string terminator.  Null bytes are not permitted
     within multibyte characters.

     The mblen() function computes the length in bytes of a multibyte charac‐
     ter mbchar.  Up to nbytes bytes are examined.

     The mbtowc() function converts a multibyte character mbchar into a wide
     character and stores the result in the object pointed to by wcharp. Up to
     nbytes bytes are examined.

     The wctomb() function converts a wide character wchar into a multibyte
     character and stores the result in mbchar.	 The object pointed to by
     mbchar must be large enough to accommodate the multibyte character.

     The mbstowcs() function converts a multibyte character string mbstring
     into a wide character string wcstring.  No more than nwchars wide charac‐
     ters are stored.  A terminating null wide character is appended if there
     is room.

     The wcstombs() function converts a wide character string wcstring into a
     multibyte character string mbstring.  Up to nbytes bytes are stored in
     mbstring.	Partial multibyte characters at the end of the string are not
     stored.  The multibyte character string is null terminated if there is

     If multibyte characters are not supported in the current locale, all of
     these functions will return -1 if characters can be processed, otherwise

     If mbchar is NULL, the mblen(), mbtowc() and wctomb() functions return
     nonzero if shift states are supported, zero otherwise.  If mbchar is
     valid, then these functions return the number of bytes processed in
     mbchar, or -1 if no multibyte character could be recognized or converted.

     The mbstowcs() function returns the number of wide characters converted,
     not counting any terminating null wide character.	The wcstombs() func‐
     tion returns the number of bytes converted, not counting any terminating
     null byte.	 If any invalid multibyte characters are encountered, both
     functions return -1.

     euc(4), mbrune(3), rune(3), setlocale(3), utf2(4)

     The mblen(), mbstowcs(), mbtowc(), wcstombs() and wctomb() functions con‐
     form to ANSI X3.159-1989 (“ANSI C89”).

     The current implementation does not support shift states.

BSD			      September 28, 2021			   BSD

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