the QuakeC interpreter used to use string pointer offsets from pr_strings
even when the pointers lead to engine data which is often well out of
32bit range on a 64bit architecture and they lead to crashes. they now
go through the new PR_SetEngineString and PR_GetString functions which
turn any address outside the pr_strings area into an index into a table
of engine string addresses, adding new string addresses to the table as
needed. the engine strings table is allocated with 256 entries at first
(see the PR_STRING_ALLOCSLOTS definition in pr_edict.c) and its size is
incremented by 256 as needed and re-allocated on the zone. managing that
allocation and reallocation is accomplished by the recently added Z_Realloc
function. implementation based on the uhexen2 (hexen2: hammer of thyrion)
engine which, in turn, is loosely based on twilight and quakeforge engines.
pr_strings range check is from tyrquake.
pr_edict.c: added the new PR_SetEngineString, PR_GetString, PR_AllocString
public functions and the new private PR_AllocStringSlots function. made
ED_NewString private to pr_edict.c and reworked it to return an index to a
newly allocated string.
progs.h: added prototypes for the new public PR_SetEngineString, PR_GetString
and PR_AllocString functions.
host_cmd.c, pr_cmds.c, pr_edict.c, pr_exec.c, progs.h, sv_main.c, sv_phys.c:
modifed to use the new PR_SetEngineString and PR_GetString functions.
git-svn-id: svn://svn.code.sf.net/p/quakespasm/code/trunk/quakespasm@38 af15c1b1-3010-417e-b628-4374ebc0bcbd
