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<title>s6-dns: the s6dns_fmt library interface</title>
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<h1> The <tt>s6dns_fmt</tt> library interface </h1>
<p>
The following functions and structures are declared in the <tt>s6-dns/s6dns-fmt.h</tt> header,
and implemented in the <tt>libs6dns.a</tt> or <tt>libs6dns.so</tt> library.
</p>
<h2> General information </h2>
<p>
<tt>s6dns_fmt</tt> provides primitives to format RR contents into
printable strings.
</p>
<h2> Functions </h2>
<p>
<code> size_t s6dns_fmt_domain (char *s, size_t max, s6dns_domain_t const *d) </code> <br />
Writes into string <em>s</em> the domain contained in *<em>d</em> (in string
form). Returns the number of bytes written, or 0 in case of failure. If
the output would be more than <em>max</em> bytes, 0 ENAMETOOLONG is returned.
To avoid that, S6DNS_FMT_DOMAIN is a suitable number of bytes to preallocate <em>s</em>.
This function is actually an alias to <tt>s6dns_domain_tostring</tt>.
</p>
<p>
<code> size_t s6dns_fmt_domainlist (char *s, size_t max, s6dns_domain_t const *list, unsigned int n, char const *delim, size_t delimlen) </code> <br />
Writes into string <em>s</em> the list of <em>n</em> domains (in string form)
pointed to by <em>list</em>. Between each domain (and not after the last one),
string <em>delim</em> of length <em>delimlen</em> is appended.
The function returns the number of bytes written, or 0 in case of failure. If
the output would be more than <em>max</em> bytes, 0 ENAMETOOLONG is returned.
To avoid that, S6DNS_FMT_DOMAINLIST(n) is a suitable number of bytes to preallocate <em>s</em>.
</p>
<p>
<code> size_t s6dns_fmt_hinfo (char *s, size_t max, s6dns_message_rr_hinfo_t const *p) </code> <br />
Writes into string <em>s</em> the HINFO contained in *<em>p</em>: cpu, then os,
separated by a space.
Returns the number of bytes written, or 0 in case of failure. If
the output would be more than <em>max</em> bytes, 0 ENAMETOOLONG is returned.
To avoid that, S6DNS_FMT_HINFO is a suitable number of bytes to preallocate <em>s</em>.
</p>
<p>
<code> size_t s6dns_fmt_mx (char *s, size_t max, s6dns_message_rr_mx_t const *p) </code> <br />
Writes into string <em>s</em> the MX contained in *<em>p</em>: preference, then
exchanger name, separated by a space.
Returns the number of bytes written, or 0 in case of failure. If
the output would be more than <em>max</em> bytes, 0 ENAMETOOLONG is returned.
To avoid that, S6DNS_FMT_MX is a suitable number of bytes to preallocate <em>s</em>.
</p>
<p>
<code> size_t s6dns_fmt_soa (char *s, size_t max, s6dns_message_rr_soa_t const *p) </code> <br />
Writes into string <em>s</em> the SOA contained in *<em>p</em>:
mname, then rname, then serial number, refresh time, retry time, expiration time
and minimum time, separated by spaces.
Returns the number of bytes written, or 0 in case of failure. If
the output would be more than <em>max</em> bytes, 0 ENAMETOOLONG is returned.
To avoid that, S6DNS_FMT_SOA is a suitable number of bytes to preallocate <em>s</em>.
</p>
<p>
<code> size_t s6dns_fmt_srv (char *s, size_t max, s6dns_message_rr_srv_t const *p) </code> <br />
Writes into string <em>s</em> the SRV contained in *<em>p</em>: priority,
then weight, then port, then target, separated by spaces.
Returns the number of bytes written, or 0 in case of failure. If
the output would be more than <em>max</em> bytes, 0 ENAMETOOLONG is returned.
To avoid that, S6DNS_FMT_SRV is a suitable number of bytes to preallocate <em>s</em>.
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