xo_attr_h3
Add attribute name/value pairs to formatted output
Part of xo_attr(3).
Usage
#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);
Library
library “libxo”
Overview
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.
Releases
25 releases since FreeBSD 11.0-RELEASE; the text changed 2 times.