[Freeciv-Dev] bug in function get_worker_city (PR#742)

[Nicolas Brunel <brunel@xxxxxxxxxxxxxxxx>]

Hello,

  I encountered a bug playing friday the 13 th april cvs version.
The savegame can be found on ftp.freeciv.org in the incoming directory.
The bug will occur after the year 3250 bc. Please solve the problem
by patching the sources with the appropriate corrections.

Happy bug hunting,

Nicolas Brunel

Ps

gdb message is :

#0  0x809328c in get_worker_city (pcity=0x8870c18, x=135510900,
y=-1073744292)
    at city.c:114
#1  0x8062d51 in update_city_tile_status (pcity=0x8870c18,
city_x=135510900, 
    city_y=-1073744292) at citytools.c:1852
#2  0x8064067 in server_set_worker_city (pcity=0x81ff1d8, city_x=2,
city_y=4)
    at citytools.c:1796
#3  0x80650a1 in worker_loop (pcity=0x81ff1d8, foodneed=0xbffff6a8, 
    prodneed=0xbffff6ac, workers=0xbffff6b0) at cityturn.c:651
#4  0x80653d5 in auto_arrange_workers (pcity=0x81ff1d8) at cityturn.c:738
#5  0x8061a72 in create_city (pplayer=0x813bb74, x=34, y=20, 
    name=0xbffff7ac "Liepaja") at citytools.c:1056
#6  0x80544f2 in handle_unit_build_city (pplayer=0x813bb74,
req=0xbffff79c)
    at unithand.c:475
#7  0x808b97c in ai_do_build_city (pplayer=0x813bb74, punit=0x81fd878)
    at settlers.c:69
#8  0x808f9fd in auto_settler_findwork (pplayer=0x813bb74,
punit=0x81fd878)
    at settlers.c:1307
#9  0x808ffb2 in auto_settlers_player (pplayer=0x813bb74) at
settlers.c:1366
#10 0x80907fa in auto_settlers () at settlers.c:1478
#11 0x804cc9b in srv_main () at srv_main.c:471
#12 0x8049ac6 in main (argc=3, argv=0xbffffab4) at civserver.c:147
#13 0x4004816b in __libc_start_main () from /lib/libc.so.6