.TH LIBSIMPLE_STRISUTF8 3 libsimple
.SH NAME
libsimple_strisutf8, libsimple_strnisutf8, libsimple_memisutf8 \- check if a string is encoded in UTF-8

.SH SYNOPSIS
.nf
#include <libsimple.h>

inline int libsimple_strisutf8(const char *\fIstring\fP, int \fIallow_modified_nul\fP);
inline int libsimple_strnisutf8(const char *\fIstring\fP, size_t \fIn\fP, int \fIallow_modified_nul\fP);
int libsimple_memisutf8(const char *\fIstring\fP, size_t \fIn\fP, int \fIallow_modified_nul\fP);

#ifndef strisutf8
# define strisutf8 libsimple_strisutf8
#endif
#ifndef strnisutf8
# define strnisutf8 libsimple_strnisutf8
#endif
#ifndef memisutf8
# define memisutf8 libsimple_memisutf8
#endif
.fi
.PP
Link with
.IR \-lsimple .

.SH DESCRIPTION
The
.BR libsimple_strisutf8 (),
.BR libsimple_strnisutf8 (),
and
.BR libsimple_memisutf8 ()
functions checks if
.I string
is in valid UTF-8. If
.I allow_modified_nul
is non-zero, NUL encoded with 2 bytes is accepted.
.PP
The
.BR libsimple_strisutf8 ()
function reads
.I string
until the first NUL byte.
.PP
The
.BR libsimple_strnisutf8 ()
function reads
.I string
until the first NUL byte or the first
.I n
bytes, whichever is shorter.
.PP
The
.BR libsimple_memisutf8 ()
function reads the first
.I n
bytes from string
.IR string ,
allowing the checked text to contain NUL bytes.
Note that unlike other
.BR mem *
functions, the
.I string
parameter for the
.BR libsimple_memisutf8 ()
function is a
.B const char *
rather than a
.BR "const void *" .

.SH RETURN VALUE
The
.BR libsimple_strisutf8 (),
.BR libsimple_strnisutf8 (),
and
.BR libsimple_memisutf8 ()
function returns 1 if the
.I string
is in valid UTF-8 (Modified UTF-8 if
.I allow_modified_nul
is non-zero); otherwise 0 is returned.

.SH ERRORS
The
.BR libsimple_strisutf8 (),
.BR libsimple_strnisutf8 (),
and
.BR libsimple_memisutf8 ()
functions cannot fail.

.SH ATTRIBUTES
For an explanation of the terms used in this section, see
.BR attributes (7).
.TS
allbox;
lb lb lb
l l l.
Interface	Attribute	Value
T{
.BR libsimple_strisutf8 (),
.br
.BR libsimple_strnisutf8 (),
.br
.BR libsimple_memisutf8 ()
T}	Thread safety	MT-Safe
T{
.BR libsimple_strisutf8 (),
.br
.BR libsimple_strnisutf8 (),
.br
.BR libsimple_memisutf8 ()
T}	Async-signal safety	AS-Safe
T{
.BR libsimple_strisutf8 (),
.br
.BR libsimple_strnisutf8 (),
.br
.BR libsimple_memisutf8 ()
T}	Async-cancel safety	AC-Safe
.TE

.SH EXAMPLES
None.

.SH APPLICATION USAGE
None.

.SH RATIONALE
None.

.SH FUTURE DIRECTIONS
None.

.SH NOTES
None.

.SH HISTORY
libsimple 1.1

.SH BUGS
None.

.SH SEE ALSO,
None.