We do not have a way to know the format modifiers to use with string
functions provided by the system. `G_GUINT64_FORMAT` and other string
modifiers only work for glib string formatting functions. We cannot
use them for string functions provided by the stdlib. See:
https://developer.gnome.org/glib/stable/glib-Basic-Types.html#glib-Basic-Types.description
```
../validate/plugins/flow/formatting.c: In function 'format_number':
../validate/plugins/flow/formatting.c:68:22: error: unknown conversion type character 'l' in format [-Werror=format=]
sprintf (dest_str, "%" G_GUINT64_FORMAT, number);
^~~
In file included from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86_64/include/glib-2.0/glib/gtypes.h:32,
from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86_64/include/glib-2.0/glib/galloca.h:32,
from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86_64/include/glib-2.0/glib.h:30,
from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86_64/include/gstreamer-1.0/gst/gst.h:27,
from ../validate/plugins/flow/formatting.h:26,
from ../validate/plugins/flow/formatting.c:30:
/builds/nirbheek/cerbero/cerbero-build/dist/windows_x86_64/lib/glib-2.0/include/glibconfig.h:69:28: note: format string is defined here
#define G_GUINT64_FORMAT "llu"
^
../validate/plugins/flow/formatting.c:68:22: error: too many arguments for format [-Werror=format-extra-args]
sprintf (dest_str, "%" G_GUINT64_FORMAT, number);
^~~
../validate/plugins/flow/formatting.c:68:22: error: unknown conversion type character 'l' in format [-Werror=format=]
In file included from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86_64/include/glib-2.0/glib/gtypes.h:32,
from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86_64/include/glib-2.0/glib/galloca.h:32,
from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86_64/include/glib-2.0/glib.h:30,
from /builds/nirbheek/cerbero/cerbero-build/dist/windows_x86_64/include/gstreamer-1.0/gst/gst.h:27,
from ../validate/plugins/flow/formatting.h:26,
from ../validate/plugins/flow/formatting.c:30:
/builds/nirbheek/cerbero/cerbero-build/dist/windows_x86_64/lib/glib-2.0/include/glibconfig.h:69:28: note: format string is defined here
#define G_GUINT64_FORMAT "llu"
^
../validate/plugins/flow/formatting.c:68:22: error: too many arguments for format [-Werror=format-extra-args]
sprintf (dest_str, "%" G_GUINT64_FORMAT, number);
^~~
```
Needed for https://gitlab.freedesktop.org/gstreamer/cerbero/merge_requests/419
Get a sense of files and line numbers in the parsed GstStructure
and take that information when reporting GstValidateAction errors
by letting the user know where the action comes from in the messages.
And accept non-literal string in printing formats.
Since `,` is the separator between fields of GstStructure we can
safely consider that if a line ends with it, the following line
is the logical continuity of the serialized GstStructure.
This makes writing those files more convenient and reading them
more pleasant as we do not need to add extra `\` at end of lines
anymore
