@node strncat, string
@subheading Syntax

@example
#include <string.h>

char *strncat(char *s1, const char *s2, size_t max);
@end example

@subheading Description

This function concatenates up to @var{max} characters of @var{s2} to the
end of @var{s1}.

@subheading Return Value

@var{s1}

@subheading Portability

@portability ansi, posix

@subheading Example

@example
strncat(fname, extension, 4);
@end example