NAME

sputu8 —

utf-8 library function manual page

SYNOPSIS

#include <utf-8.h>

char *
sputu8(unsigned int c, char *buffer);

char *
utf8sputc(unsigned int c, char *buffer);

DESCRIPTION

The sputu8() function of utf-8 library converts a UTC-4 (31-bit Unicode) integer to a sequence of one or more characters representing its UTF-8 value, and writes the result to a buffer (character string). It appends a NUL at the end of the buffer, so it can be processed as a standard C string.

utf8sputc() is a macro which simply gives sputu8() a name that may be more convenient to remember. It is defined in ⟨utf-8.h⟩.

The sputu8() function and the utf8sputc() macro take two arguments: c, the UTC-4 code, and buffer, a pointer to a string of characters. The buffer must have at least seven bytes available for writing: UTF-8 encodes Unicode into 1 - 6 characters, plus we need room for the terminating NUL.

RETURN VALUES

sputu8() returns the pointer to the terminating NUL. This allows you to append the next sequence of characters without having to determine where the string ends after each call to sputu8().

If buffer is NULL, sputu8() returns NULL. If c is not a valid UTC-4 code (i.e., its high bit is set), no conversion takes place, and sputu8() just returns buffer.

STANDARDS

ISO 10646-1: 1993 (``Unicode''), RFC 2044: 1996 (``UTF-8''), ANSI X3.159-1989 (“ANSI C89”).

DIAGNOSTICS

You should always compare the RETURN VALUES to buffer. If they are NULL, no conversion took place. Otherwise, if they are identical, c was not a valid UTC-8 integer. Anything else indicates successful conversion.

AUTHORS

This manual page was written by G. Adam Stanislav ⟨adam@whizkidtech.net⟩.

BUGS

None known.