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LIBXO(3) FreeBSD Library Functions Manual LIBXO(3)
NAME
xo_attr, xo_attr_h, xo_attr_hv - Add attribute name/value pairs to
formatted output
LIBRARY
Text, XML, JSON, and HTML Output Emission Library (libxo, -lxo)
SYNOPSIS
#include <libxo/xo.h>
xo_ssize_t
xo_attr(const char *name, const char *fmt, ...);
xo_ssize_t
xo_attr_h(xo_handle_t *handle, const char *name, const char *fmt, ...);
xo_ssize_t
xo_attr_hv(xo_handle_t *handle, const char *name, const char *fmt,
va_list vap);
DESCRIPTION
The xo_attr() function emits attributes for the XML output style. The
attribute value is recorded in the handle and is attached to the next
field that is emitted via a xo_emit(3) call.
The name parameter give the name of the attribute to be encoded. The fmt
parameter gives a printf-style format string used to format the value of
the attribute using any remaining arguments, or the vap parameter as
passed to xo_attr_hv().
EXAMPLE:
xo_attr("seconds", "%ld", (unsigned long) login_time);
struct tm *tmp = localtime(login_time);
strftime(buf, sizeof(buf), "%R", tmp);
xo_emit("Logged in at {:login-time}\n", buf);
XML:
<login-time seconds="1408336270">00:14</login-time>
Since attributes are only emitted in XML, their use should be limited to
meta-data and additional or redundant representations of data already
emitted in other form.
SEE ALSO
xo_emit(3), libxo(3)
HISTORY
The libxo library first appeared in FreeBSD 11.0.
AUTHORS
libxo was written by Phil Shafer <phil@freebsd.org>.
FreeBSD 14.0-RELEASE-p11 July, 2014 FreeBSD 14.0-RELEASE-p11