RUNE(2) 							System Calls Manual							   RUNE(2)

NAME

       runetochar, chartorune, runelen, fullrune, utflen, utfrune, utfrrune, utfutf - rune/UTF conversion

SYNOPSIS

       #include <u.h>
       #include <libc.h>

       int    runetochar(char *s, Rune *r)

       int    chartorune(Rune *r, char *s)

       int    runelen(long r)

       int    fullrune(char *s, int n)

       int    utflen(char *s)

       char*  utfrune(char *s, long c)

       char*  utfrrune(char *s, long c)

       char*  utfutf(char *s1, char *s2)

DESCRIPTION

       These routines convert to and from a UTF byte stream and runes.

       Runetochar  copies  one	rune  at  r to at most UTFmax bytes starting at s and returns the number of bytes copied.  UTFmax, defined as 3 in
       <libc.h>, is the maximum number of bytes required to represent a rune.

       Chartorune copies at most UTFmax bytes starting at s to one rune at r and returns the number of bytes copied.  If the input is not  exactly
       in UTF format, chartorune will convert to 0x80 and return 1.

       Runelen returns the number of bytes required to convert r into UTF.

       Fullrune  returns  1  if the string s of length n is long enough to be decoded by chartorune and 0 otherwise.  This does not guarantee that
       the string contains a legal UTF encoding.  This routine is used by programs that obtain input a byte at a time and need to know when a full
       rune has arrived.

       The following routines are analogous to the corresponding string routines with utf substituted for str and rune substituted for chr.

       Utflen returns the number of runes that are represented by the UTF string s.

       Utfrune	(utfrrune) returns a pointer to the first (last) occurrence of rune c in the UTF string s, or 0 if c does not occur in the string.
       The NUL byte terminating a string is considered to be part of the string s.

       Utfutf returns a pointer to the first occurrence of the UTF string s2 as a UTF substring of s1, or 0 if there is none.  If s2 is  the  null
       string, utfutf returns s1.

SOURCE

       /sys/src/libc/port/rune.c
       /sys/src/libc/port/utfrune.c

SEE ALSO

       utf(6), tcs(1)

																	   RUNE(2)