rune man page on 4.4BSD

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RUNE(3)			 BSD Library Functions Manual		       RUNE(3)

     setrunelocale, setinvalidrune, sgetrune, sputrune — rune support for C

     #include <rune.h>
     #include <errno.h>

     setrunelocale(char *locale);

     setinvalidrune(rune_t rune);

     sgetrune(const char *string, size_t n, char const **result);

     sputrune(rune_t rune, char *string, size_t n, char **result);

     #include <stdio.h>

     fgetrune(FILE *stream);

     fungetrune(rune_t rune, FILE *stream);

     fputrune(rune_t rune, FILE *stream);

     The setrunelocale() controls the type of encoding used to represent runes
     as multibyte strings as well as the properties of the runes as defined in
     <ctype.h>.	 The locale argument indicates which locale to load.  If the
     locale is successfully loaded, 0 is returned, otherwise an errno value is
     returned to indicate the type of error.

     The setinvalidrune() function sets the value of the global value
     _INVALID_RUNE to be rune.

     The sgetrune() function tries to read a single multibyte character from
     string, which is at most n bytes long.  If sgetrune() is successful, the
     rune is returned.	If result is not NULL, *result will point to the first
     byte which was not converted in string. If the first n bytes of string do
     not describe a full multibyte character, _INVALID_RUNE is returned and
     *result will point to string. If there is an encoding error at the start
     of string, _INVALID_RUNE is returned and *result will point to the second
     character of string.

     the sputrune() function tries to encode rune as a multibyte string and
     store it at string, but no more than n bytes will be stored.  If result
     is not NULL, *result will be set to point to the first byte in string
     following the new multibyte character.  If string is NULL, *result will
     point to (char *)0 + x, where x is the number of bytes that would be
     needed to store the multibyte value.  If the multibyte character would
     consist of more than n bytes and result is not NULL, *result will be set
     to NULL. In all cases, sputrune() will return the number of bytes which
     would be needed to store rune as a multibyte character.

     The fgetrune() function operates the same as sgetrune() with the excep‐
     tion that it attempts to read enough bytes from stream to decode a single
     rune.  It returns either EOF on end of file, _INVALID_RUNE on an encoding
     error, or the rune decoded if all went well.

     The fungetrune() function pushes the multibyte encoding, as provided by
     sputrune(), of rune onto stream such that the next fgetrune() call will
     return rune.  It returns EOF if it fails and 0 on success.

     The fputrune() function writes the multibyte encoding of rune, as pro‐
     vided by sputrune(), onto stream.	It returns EOF on failure and 0 on

     The setrunelocale() function returns one of the following values:

     0	       setrunelocale was successful.

     EFAULT    locale was NULL.

     ENOENT    The locale could not be found.

     EFTYPE    The file found was not a valid file.

     EINVAL    The encoding indicated by the locale was unknown.

     The sgetrune() function either returns the rune read or _INVALID_RUNE.
     The sputrune() function returns the number of bytes needed to store rune
     as a multibyte string.

     /usr/share/locale/locale/LC_CTYPE	binary LC_CTYPE file for the locale

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

     The ANSI C type wchar_t is the same as rune_t.  Rune_t was chosen to
     accent the purposeful choice of not basing the system with the ANSI C
     primitives, which were, shall we say, less aesthetic.

     These functions first appeared in 4.4BSD.

     The setrunelocale() function and the other non-ANSI rune functions were
     inspired by Plan 9 from Bell Labs as a much more sane alternative to the
     ANSI multibyte and wide character support.

     All of the ANSI multibyte and wide character support functions are built
     using the rune functions.

BSD			       October 25, 2021				   BSD

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