http://git.savannah.gnu.org/cgit/grub.git/tree/grub-core/commands/syslinuxcfg.c
And an example that uses it: http://git.savannah.gnu.org/cgit/grub.git/tree/docs/osdetect.cfg
http://git.savannah.gnu.org/cgit/grub.git/tree/grub-core/commands/syslinuxcfg.c
And an example that uses it: http://git.savannah.gnu.org/cgit/grub.git/tree/docs/osdetect.cfg