.TH LLAPI_NAME_VALIDATE 3 2026-08-23 "Lustre User API" "Lustre Library Functions"
.SH NAME
llapi_name_validate() \- check string contains only valid characters
.SH SYNOPSIS
.nf
.B #include <lustre/lustreapi.h>
.PP
.BI "int llapi_name_validate(const char *" name ", const char *" extra_chars ","
.BI "                        unsigned int " maxlen ");"
.fi
.SH DESCRIPTION
.B llapi_name_validate()
verifies that the characters in
.I name
contain only alphanumeric characters,
plus a limited number of other characters in
.IR extra_chars ,
and is not longer than
.I maxlen
bytes in length (excluding NUL terminator).
This ensures that
.I name
is suitable for use in filesystem identifiers such as the filesystem name,
OST pool name, nodemap name, and similar.
.SH RETURN VALUE
.B llapi_name_validate()
returns 0 on success, or a negative errno value on failure.
.SH ERRORS
.TP 15
.SM EINVAL
The supplied
.B name
contained an illegal character.
.TP
.SM ENAMETOOLONG
The supplied
.B name
exceeded
.B maxlen
characters without a NUL terminator.
.TP
.SM ENXIO
The
.B name
was NULL or empty.
.SH EXAMPLES
Check if
.B fsname
contains only alphanumeric, dash
.RB (' - '),
and underscore
.RB (' _ ')
characters and does not exceed the maximum filesystem name length:
.PP
.EX
#include <string.h>
#include <lustre/lustreapi.h>

int main(int argc, char *argv[])
{
        char fsname[] = "newfs123";

        rc = llapi_name_validate(fsname, "-_", LUSTRE_MAXFSNAME);
        if (rc < 0) {
                fprintf(stderr, "%s: fsname '%s' invalid: %s\\n",
                        argv[1], fsname, strerror(errno));
                return rc;
        }
}
.EE
.SH AVAILABILITY
.B llapi_name_validate
is part of the
.BR lustre (7)
filesystem package since release 2.18.0.
.\" added in commit 2.17.52.xx
.SH SEE ALSO
.BR lustreapi (7)