01-19-2010
those are formatting specifiers of printf.
google printf for more information.
%s is for string. %16s means prints the $2 as a string of 16 characters (right justified).
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LEARN ABOUT REDHAT
ne_addr_error
NE_ADDR_RESOLVE(3) neon API reference NE_ADDR_RESOLVE(3)
NAME
ne_addr_resolve, ne_addr_result, ne_addr_first, ne_addr_next, ne_addr_print, ne_addr_error, ne_addr_destroy - functions to resolve host-
names to addresses
SYNOPSIS
#include <ne_socket.h>
ne_sock_addr *ne_addr_resolve (const char *hostname, int flags);
int ne_addr_result (const ne_sock_addr *addr);
ne_inet_addr *ne_addr_first (ne_sock_addr *addr);
ne_inet_addr *ne_addr_next (ne_sock_addr *addr);
char *ne_addr_print (const ne_inet_addr *iaddr, char *buffer, size_t bufsiz);
char *ne_addr_error (const ne_sock_addr *addr, char *buffer, size_t bufsiz);
void ne_addr_destroy (ne_sock_addr *addr);
DESCRIPTION
The ne_addr_resolve function resolves the given hostname, returning an ne_sock_addr object representing the address (or addresses) associ-
ated with the hostname. The flags parameter is currently unused, and should be passed as 0.
The hostname passed to ne_addr_resolve can be a DNS hostname (e.g. www.example.com) or an IPv4 dotted quad (e.g. 192.0.34.72); or, on sys-
tems which support IPv6, an IPv6 hex address, which may be enclosed in brackets, e.g. [::1].
To determine whether the hostname was successfully resolved, the ne_addr_result function is used, which returns non-zero if an error oc-
curred. If an error did occur, the ne_addr_error function can be used, which will copy the error string into a given buffer (of size buf-
siz.
The functions ne_addr_first and ne_addr_next are used to retrieve the Internet addresses associated with an address object which has been
successfully resolved. ne_addr_first returns the first address; ne_addr_next returns the next address after the most recent call to ne_ad-
dr_next or ne_addr_first, or NULL if there are no more addresses. The ne_inet_addr pointer returned by these functions can be passed to
ne_sock_connect to connect a socket.
To return the string representation of a particular network address, the ne_addr_print function can be used.
After the address object has been used, it should be destroyed using ne_addr_destroy.
RETURN VALUE
ne_addr_resolve returns a pointer to an address object, and never NULL. ne_addr_error and ne_addr_print both return the buffer parameter .
EXAMPLES
The code below prints out the set of addresses associated with the hostname www.google.com.
ne_sock_addr *addr;
char buf[256];
addr = ne_addr_resolve("www.google.com", 0);
if (ne_addr_result(addr)) {
printf("Could not resolve www.google.com: %s
",
ne_addr_error(addr, buf, sizeof buf));
} else {
ne_inet_addr *ia;
printf("www.google.com:");
for (ia = ne_addr_first(addr); ia != NULL; ia = ne_addr_next(addr)) {
printf(" %s", ne_addr_print(ia, buf, sizeof buf));
}
putchar('
');
}
ne_addr_destroy(addr);
AUTHOR
Joe Orton <neon@webdav.org>.
neon 0.23.5 8 October 2002 NE_ADDR_RESOLVE(3)