src/lib/commands/buil.c

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/*
 *  Empire - A multi-player, client/server Internet based war game.
 *  Copyright (C) 1986-2007, Dave Pare, Jeff Bailey, Thomas Ruschak,
 *                           Ken Stevens, Steve McClure
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  ---
 *
 *  See files README, COPYING and CREDITS in the root of the source
 *  tree for related information and legal notices.  It is expected
 *  that future projects/authors will amend these files as needed.
 *
 *  ---
 *
 *  buil.c: Build ships, nukes, bridges, planes, land units, bridge towers
 * 
 *  Known contributors to this file:
 *      Steve McClure, 1998-2000
 *      Markus Armbruster, 2004-2006
 */

#include <config.h>

#include <limits.h>
#include "commands.h"
#include "game.h"
#include "land.h"
#include "lost.h"
#include "map.h"
#include "nuke.h"
#include "optlist.h"
#include "path.h"
#include "plague.h"
#include "plane.h"
#include "ship.h"
#include "treaty.h"

static int build_nuke(struct sctstr *sp,
                      struct nchrstr *np, short *vec, int tlev);
static int build_ship(struct sctstr *sp,
                      struct mchrstr *mp, short *vec, int tlev);
static int build_land(struct sctstr *sp,
                      struct lchrstr *lp, short *vec, int tlev);
static int build_bridge(struct sctstr *sp, short *vec);
static int build_tower(struct sctstr *sp, short *vec);
static int build_plane(struct sctstr *sp,
                       struct plchrstr *pp, short *vec, int tlev);
static int build_can_afford(double, char *);

/*
 * build <WHAT> <SECTS> <TYPE|DIR|MEG> [NUMBER]
 */
int
buil(void)
{
    struct sctstr sect;
    struct nstr_sect nstr;
    struct natstr *natp;
    int rqtech;
    int tlev;
    int rlev;
    int type;
    char what;
    struct lchrstr *lp;
    struct mchrstr *mp;
    struct plchrstr *pp;
    struct nchrstr *np;
    char *p;
    int gotsect = 0;
    int built;
    int number;
    char buf[1024];

    natp = getnatp(player->cnum);
    if ((p =
         getstarg(player->argp[1],
                  "Build (ship, nuke, bridge, plane, land unit, tower)? ",
                  buf)) == 0)
        return RET_SYN;
    what = *p;

    if (!snxtsct(&nstr, player->argp[2])) {
        pr("Bad sector specification.\n");
        return RET_SYN;
    }
    tlev = (int)natp->nat_level[NAT_TLEV];
    rlev = (int)natp->nat_level[NAT_RLEV];

    switch (what) {
    case 'p':
        p = getstarg(player->argp[3], "Plane type? ", buf);
        if (p == 0 || *p == 0)
            return RET_SYN;
        type = ef_elt_byname(EF_PLANE_CHR, p);
        if (type >= 0) {
            pp = &plchr[type];
            rqtech = pp->pl_tech;
            if (rqtech > tlev)
                type = -1;
        }
        if (type < 0) {
            pr("You can't build that!\n");
            pr("Use `show plane build %d' to show types you can build.\n",
               tlev);
            return RET_FAIL;
        }
        break;
    case 's':
        p = getstarg(player->argp[3], "Ship type? ", buf);
        if (p == 0 || *p == 0)
            return RET_SYN;
        type = ef_elt_byname(EF_SHIP_CHR, p);
        if (type >= 0) {
            mp = &mchr[type];
            rqtech = mp->m_tech;
            if (rqtech > tlev)
                type = -1;
            if ((mp->m_flags & M_TRADE) && !opt_TRADESHIPS)
                type = -1;
        }
        if (type < 0) {
            pr("You can't build that!\n");
            pr("Use `show ship build %d' to show types you can build.\n",
               tlev);
            return RET_FAIL;
        }
        break;
    case 'l':
        p = getstarg(player->argp[3], "Land unit type? ", buf);
        if (p == 0 || *p == 0)
            return RET_SYN;
        type = ef_elt_byname(EF_LAND_CHR, p);
        if (type >= 0) {
            lp = &lchr[type];
            rqtech = lp->l_tech;
            if (rqtech > tlev)
                type = -1;
            if ((lp->l_flags & L_SPY) && !opt_LANDSPIES)
                type = -1;
        }
        if (type < 0) {
            pr("You can't build that!\n");
            pr("Use `show land build %d' to show types you can build.\n",
               tlev);
            return RET_FAIL;
        }
        break;
    case 'b':
        if (natp->nat_level[NAT_TLEV] + 0.005 < buil_bt) {
            pr("Building a span requires a tech of %.0f\n", buil_bt);
            return RET_FAIL;
        }
        break;
    case 't':
        if (!opt_BRIDGETOWERS) {
            pr("Bridge tower building is disabled.\n");
            return RET_FAIL;
        }
        if (natp->nat_level[NAT_TLEV] + 0.005 < buil_tower_bt) {
            pr("Building a tower requires a tech of %.0f\n",
               buil_tower_bt);
            return RET_FAIL;
        }
        break;
    case 'n':
        if (!ef_nelem(EF_NUKE_CHR)) {
            pr("There are no nukes in this game.\n");
            return RET_FAIL;
        }
        p = getstarg(player->argp[3], "Nuke type? ", buf);
        if (p == 0 || *p == 0)
            return RET_SYN;
        type = ef_elt_byname(EF_NUKE_CHR, p);
        if (type >= 0) {
            np = &nchr[type];
            rqtech = np->n_tech;
            if (rqtech > tlev
                || (drnuke_const > MIN_DRNUKE_CONST &&
                    np->n_tech * drnuke_const > rlev))
                type = -1;
        }
        if (type < 0) {
            int tt = tlev;
            if (drnuke_const > MIN_DRNUKE_CONST)
                tt = (tlev < (rlev / drnuke_const) ? (int)tlev :
                      (int)(rlev / drnuke_const));
            pr("You can't build that!\n");
            pr("Use `show nuke build %d' to show types you can build.\n",
               tt);
            return RET_FAIL;
        }
        break;
    default:
        pr("You can't build that!\n");
        return RET_SYN;
    }

    number = 1;
    if (what != 'b' && what != 't') {
        if (player->argp[4]) {
            number = atoi(player->argp[4]);
            if (number > 20) {
                char bstr[80];
                sprintf(bstr,
                        "Are you sure that you want to build %s of them? ",
                        player->argp[4]);
                p = getstarg(player->argp[6], bstr, buf);
                if (p == 0 || *p != 'y')
                    return RET_SYN;
            }
        }
    }

    if (what != 'b' && what != 'n' && what != 't') {
        if (player->argp[5]) {
            tlev = atoi(player->argp[5]);
            if (tlev > natp->nat_level[NAT_TLEV] && !player->god) {
                pr("Your tech level is only %d.\n",
                   (int)natp->nat_level[NAT_TLEV]);
                return RET_FAIL;
            }
            if (rqtech > tlev) {
                pr("Required tech is %d.\n", rqtech);
                return RET_FAIL;
            }
            pr("building with tech level %d.\n", tlev);
        }
    }

    while (number-- > 0) {
        while (nxtsct(&nstr, &sect)) {
            gotsect++;
            if (!player->owner)
                continue;
            switch (what) {
            case 'l':
                built = build_land(&sect, lp, sect.sct_item, tlev);
                break;
            case 's':
                built = build_ship(&sect, mp, sect.sct_item, tlev);
                break;
            case 'b':
                built = build_bridge(&sect, sect.sct_item);
                break;
            case 't':
                built = build_tower(&sect, sect.sct_item);
                break;
            case 'n':
                built = build_nuke(&sect, np, sect.sct_item, tlev);
                break;
            case 'p':
                built = build_plane(&sect, pp, sect.sct_item, tlev);
                break;
            default:
                CANT_REACH();
                return RET_FAIL;
            }
            if (built) {
                putsect(&sect);
            }
        }
        snxtsct_rewind(&nstr);
    }
    if (!gotsect) {
        pr("Bad sector specification.\n");
    }
    return RET_OK;
}

static int
build_ship(struct sctstr *sp, struct mchrstr *mp, short *vec, int tlev)
{
    struct shpstr ship;
    struct nstr_item nstr;
    int avail, i;
    double cost;
    double eff = SHIP_MINEFF / 100.0;
    int lcm, hcm;
    int freeship = 0;

    hcm = roundavg(mp->m_hcm * eff);
    lcm = roundavg(mp->m_lcm * eff);

    if (sp->sct_type != SCT_HARBR) {
        pr("Ships must be built in harbours.\n");
        return 0;
    }
    if (sp->sct_effic < 60 && !player->god) {
        pr("Sector %s is not 60%% efficient.\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
    if (vec[I_LCM] < lcm || vec[I_HCM] < hcm) {
        pr("Not enough materials in %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
    avail = (SHP_BLD_WORK(mp->m_lcm, mp->m_hcm) * SHIP_MINEFF + 99) / 100;
    if (sp->sct_avail < avail) {
        pr("Not enough available work in %s to build a %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum), mp->m_name);
        pr(" (%d available work required)\n", avail);
        return 0;
    }
    cost = mp->m_cost * SHIP_MINEFF / 100.0;
    if (!build_can_afford(cost, mp->m_name))
        return 0;
    if (!trechk(player->cnum, 0, NEWSHP))
        return 0;
    if (!check_sect_ok(sp))
        return 0;
    sp->sct_avail -= avail;
    player->dolcost += cost;
    snxtitem_all(&nstr, EF_SHIP);
    while (nxtitem(&nstr, &ship)) {
        if (ship.shp_own == 0) {
            freeship++;
            break;
        }
    }
    if (freeship == 0) {
        ef_extend(EF_SHIP, 50);
    }
    memset(&ship, 0, sizeof(struct shpstr));
    ship.shp_x = sp->sct_x;
    ship.shp_y = sp->sct_y;
    ship.shp_destx[0] = sp->sct_x;
    ship.shp_desty[0] = sp->sct_y;
    ship.shp_destx[1] = sp->sct_x;
    ship.shp_desty[1] = sp->sct_y;
    ship.shp_autonav = 0;
    /* new code for autonav, Chad Zabel 1-15-94 */
    for (i = 0; i < TMAX; ++i) {
        ship.shp_tstart[i] = I_NONE;
        ship.shp_tend[i] = I_NONE;
        ship.shp_lstart[i] = 0;
        ship.shp_lend[i] = 0;
    }
    ship.shp_mission = 0;
    ship.shp_own = player->cnum;
    ship.shp_type = mp - mchr;
    ship.shp_effic = SHIP_MINEFF;
    if (opt_MOB_ACCESS) {
        game_tick_to_now(&ship.shp_access);
        ship.shp_mobil = -(etu_per_update / sect_mob_neg_factor);
    } else {
        ship.shp_mobil = 0;
    }
    ship.shp_uid = nstr.cur;
    ship.shp_nplane = 0;
    ship.shp_nland = 0;
    ship.shp_nxlight = 0;
    ship.shp_nchoppers = 0;
    ship.shp_fleet = 0;
    memset(ship.shp_item, 0, sizeof(ship.shp_item));
    ship.shp_pstage = PLG_HEALTHY;
    ship.shp_ptime = 0;
    ship.shp_mobquota = 0;
    *ship.shp_path = 0;
    ship.shp_follow = nstr.cur;
    ship.shp_name[0] = 0;
    ship.shp_orig_own = player->cnum;
    ship.shp_orig_x = sp->sct_x;
    ship.shp_orig_y = sp->sct_y;
    ship.shp_fuel = mchr[(int)ship.shp_type].m_fuelc;
    ship.shp_rflags = 0;
    memset(ship.shp_rpath, 0, sizeof(ship.shp_rpath));
    shp_set_tech(&ship, tlev);

    vec[I_LCM] -= lcm;
    vec[I_HCM] -= hcm;

    if (sp->sct_pstage == PLG_INFECT)
        ship.shp_pstage = PLG_EXPOSED;
    makenotlost(EF_SHIP, ship.shp_own, ship.shp_uid,
                ship.shp_x, ship.shp_y);
    putship(ship.shp_uid, &ship);
    pr("%s", prship(&ship));
    pr(" built in sector %s\n", xyas(sp->sct_x, sp->sct_y, player->cnum));
    return 1;
}

static int
build_land(struct sctstr *sp, struct lchrstr *lp, short *vec, int tlev)
{
    struct lndstr land;
    struct nstr_item nstr;
    int avail;
    double cost;
    double eff = LAND_MINEFF / 100.0;
    int mil, lcm, hcm, gun, shell;
    int freeland = 0;

#if 0
    mil = roundavg(lp->l_mil * eff);
    shell = roundavg(lp->l_shell * eff);
    gun = roundavg(lp->l_gun * eff);
#else
    mil = shell = gun = 0;
#endif
    hcm = roundavg(lp->l_hcm * eff);
    lcm = roundavg(lp->l_lcm * eff);

    if (sp->sct_type != SCT_HEADQ) {
        pr("Land Units must be built in headquarters.\n");
        return 0;
    }
    if (sp->sct_effic < 60 && !player->god) {
        pr("Sector %s is not 60%% efficient.\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
    if (vec[I_LCM] < lcm || vec[I_HCM] < hcm) {
        pr("Not enough materials in %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
#if 0
    if (vec[I_GUN] < gun || vec[I_GUN] == 0) {
        pr("Not enough guns in %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
    if (vec[I_SHELL] < shell) {
        pr("Not enough shells in %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
    if (vec[I_MILIT] < mil) {
        pr("Not enough military in %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
#endif
    if (!trechk(player->cnum, 0, NEWLND))
        return 0;
    if (!check_sect_ok(sp))
        return 0;
    avail = (LND_BLD_WORK(lp->l_lcm, lp->l_hcm) * LAND_MINEFF + 99) / 100;
    if (sp->sct_avail < avail) {
        pr("Not enough available work in %s to build a %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum), lp->l_name);
        pr(" (%d available work required)\n", avail);
        return 0;
    }
    cost = lp->l_cost * LAND_MINEFF / 100.0;
    if (!build_can_afford(cost, lp->l_name))
        return 0;
    sp->sct_avail -= avail;
    player->dolcost += cost;
    snxtitem_all(&nstr, EF_LAND);
    while (nxtitem(&nstr, &land)) {
        if (land.lnd_own == 0) {
            freeland++;
            break;
        }
    }
    if (freeland == 0) {
        ef_extend(EF_LAND, 50);
    }
    memset(&land, 0, sizeof(struct lndstr));
    land.lnd_x = sp->sct_x;
    land.lnd_y = sp->sct_y;
    land.lnd_own = player->cnum;
    land.lnd_mission = 0;
    land.lnd_type = lp - lchr;
    land.lnd_effic = LAND_MINEFF;
    if (opt_MOB_ACCESS) {
        game_tick_to_now(&land.lnd_access);
        land.lnd_mobil = -(etu_per_update / sect_mob_neg_factor);
    } else {
        land.lnd_mobil = 0;
    }
    land.lnd_uid = nstr.cur;
    land.lnd_army = 0;
    land.lnd_flags = 0;
    land.lnd_ship = -1;
    land.lnd_land = -1;
    land.lnd_nland = 0;
    land.lnd_harden = 0;
    land.lnd_retreat = morale_base;
    land.lnd_fuel = lp->l_fuelc;
    land.lnd_nxlight = 0;
    land.lnd_rflags = 0;
    memset(land.lnd_rpath, 0, sizeof(land.lnd_rpath));
    land.lnd_rad_max = 0;
    memset(land.lnd_item, 0, sizeof(land.lnd_item));
    land.lnd_pstage = PLG_HEALTHY;
    land.lnd_ptime = 0;
    lnd_set_tech(&land, tlev);

    vec[I_LCM] -= lcm;
    vec[I_HCM] -= hcm;
    vec[I_MILIT] -= mil;
    vec[I_GUN] -= gun;
    vec[I_SHELL] -= shell;

    if (sp->sct_pstage == PLG_INFECT)
        land.lnd_pstage = PLG_EXPOSED;
    putland(nstr.cur, &land);
    makenotlost(EF_LAND, land.lnd_own, land.lnd_uid,
                land.lnd_x, land.lnd_y);
    pr("%s", prland(&land));
    pr(" built in sector %s\n", xyas(sp->sct_x, sp->sct_y, player->cnum));
    return 1;
}

static int
build_bridge(struct sctstr *sp, short *vec)
{
    struct sctstr sect;
    int val;
    int newx, newy;
    int avail;
    int nx, ny, i, good = 0;
    char *p;
    char buf[1024];

    if (opt_EASY_BRIDGES == 0) {        /* must have a bridge head or tower */
        if (sp->sct_type != SCT_BTOWER) {
            if (sp->sct_type != SCT_BHEAD)
                return 0;
            if (sp->sct_newtype != SCT_BHEAD)
                return 0;
        }
    }

    if (sp->sct_effic < 60 && !player->god) {
        pr("Sector %s is not 60%% efficient.\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }

    if (vec[I_HCM] < buil_bh) {
        pr("%s only has %d unit%s of hcm,\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum),
           vec[I_HCM], vec[I_HCM] > 1 ? "s" : "");
        pr("(a bridge span requires %d)\n", buil_bh);
        return 0;
    }

    if (!build_can_afford(buil_bc, dchr[SCT_BSPAN].d_name))
        return 0;
    avail = (SCT_BLD_WORK(0, buil_bh) * SCT_MINEFF + 99) / 100;
    if (sp->sct_avail < avail) {
        pr("Not enough available work in %s to build a bridge\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        pr(" (%d available work required)\n", avail);
        return 0;
    }
    if (!player->argp[3]) {
        pr("Bridge head at %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        nav_map(sp->sct_x, sp->sct_y, 1);
    }
    p = getstarg(player->argp[3], "build span in what direction? ", buf);
    if (!p || !*p) {
        return 0;
    }
    /* Sanity check time */
    if (!check_sect_ok(sp))
        return 0;

    if ((val = chkdir(*p, DIR_FIRST, DIR_LAST)) < 0) {
        pr("'%c' is not a valid direction...\n", *p);
        direrr(0, 0, 0);
        return 0;
    }
    newx = sp->sct_x + diroff[val][0];
    newy = sp->sct_y + diroff[val][1];
    if (getsect(newx, newy, &sect) == 0 || sect.sct_type != SCT_WATER) {
        pr("%s is not a water sector\n", xyas(newx, newy, player->cnum));
        return 0;
    }
    if (opt_EASY_BRIDGES) {
        good = 0;

        for (i = 1; i <= 6; i++) {
            struct sctstr s2;
            nx = sect.sct_x + diroff[i][0];
            ny = sect.sct_y + diroff[i][1];
            getsect(nx, ny, &s2);
            if ((s2.sct_type != SCT_WATER) && (s2.sct_type != SCT_BSPAN))
                good = 1;
        }
        if (!good) {
            pr("Bridges must be built adjacent to land or bridge towers.\n");
            pr("That sector is not adjacent to land or a bridge tower.\n");
            return 0;
        }
    }                           /* end EASY_BRIDGES */
    sp->sct_avail -= avail;
    player->dolcost += buil_bc;
    sect.sct_type = SCT_BSPAN;
    sect.sct_newtype = SCT_BSPAN;
    sect.sct_effic = SCT_MINEFF;
    sect.sct_road = 0;
    sect.sct_rail = 0;
    sect.sct_defense = 0;
    if (opt_MOB_ACCESS) {
        game_tick_to_now(&sect.sct_access);
        sect.sct_mobil = -(etu_per_update / sect_mob_neg_factor);
    } else {
        sect.sct_mobil = 0;
    }
    sect.sct_mines = 0;
    map_set(player->cnum, sect.sct_x, sect.sct_y, dchr[SCT_BSPAN].d_mnem, 2);
    writemap(player->cnum);
    putsect(&sect);
    pr("Bridge span built over %s\n",
       xyas(sect.sct_x, sect.sct_y, player->cnum));
    vec[I_HCM] -= buil_bh;
    return 1;
}

static int
build_nuke(struct sctstr *sp, struct nchrstr *np, short *vec, int tlev)
{
    struct nukstr nuke;
    struct nstr_item nstr;
    int avail;
    int freenuke;

    if (sp->sct_type != SCT_NUKE && !player->god) {
        pr("Nuclear weapons must be built in nuclear plants.\n");
        return 0;
    }
    if (sp->sct_effic < 60 && !player->god) {
        pr("Sector %s is not 60%% efficient.\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
    if (vec[I_HCM] < np->n_hcm || vec[I_LCM] < np->n_lcm ||
        vec[I_OIL] < np->n_oil || vec[I_RAD] < np->n_rad) {
        pr("Not enough materials for a %s bomb in %s\n",
           np->n_name, xyas(sp->sct_x, sp->sct_y, player->cnum));
        pr("(%d hcm, %d lcm, %d oil, & %d rads).\n",
           np->n_hcm, np->n_lcm, np->n_oil, np->n_rad);
        return 0;
    }
    if (!build_can_afford(np->n_cost, np->n_name))
        return 0;
    avail = NUK_BLD_WORK(np->n_lcm, np->n_hcm, np->n_oil, np->n_rad);
    /*
     * XXX when nukes turn into units (or whatever), then
     * make them start at 20%.  Since they don't have efficiency
     * now, we charge all the work right away.
     */
    if (sp->sct_avail < avail) {
        pr("Not enough available work in %s to build a %s;\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum), np->n_name);
        pr(" (%d available work required)\n", avail);
        return 0;
    }
    if (!trechk(player->cnum, 0, NEWNUK))
        return 0;
    if (!check_sect_ok(sp))
        return 0;
    sp->sct_avail -= avail;
    player->dolcost += np->n_cost;
    snxtitem_all(&nstr, EF_NUKE);
    freenuke = 0;
    while (nxtitem(&nstr, &nuke)) {
        if (nuke.nuk_own == 0) {
            freenuke++;
            break;
        }
    }
    if (freenuke == 0) {
        ef_extend(EF_NUKE, 50);
    }
    memset(&nuke, 0, sizeof(struct nukstr));
    nuke.nuk_x = sp->sct_x;
    nuke.nuk_y = sp->sct_y;
    nuke.nuk_own = sp->sct_own;
    nuke.nuk_type = np - nchr;
    nuke.nuk_effic = 100;
    nuke.nuk_stockpile = 0;
    nuke.nuk_ship = nuke.nuk_plane = nuke.nuk_land = -1;
    nuke.nuk_uid = nstr.cur;
    nuke.nuk_tech = tlev;

    vec[I_HCM] -= np->n_hcm;
    vec[I_LCM] -= np->n_lcm;
    vec[I_OIL] -= np->n_oil;
    vec[I_RAD] -= np->n_rad;

    makenotlost(EF_NUKE, nuke.nuk_own, nuke.nuk_uid,
                nuke.nuk_x, nuke.nuk_y);
    putnuke(nuke.nuk_uid, &nuke);
    pr("%s created in %s\n", prnuke(&nuke),
       xyas(sp->sct_x, sp->sct_y, player->cnum));
    return 1;
}

static int
build_plane(struct sctstr *sp, struct plchrstr *pp, short *vec, int tlev)
{
    struct plnstr plane;
    struct nstr_item nstr;
    int avail;
    double cost;
    double eff = PLANE_MINEFF / 100.0;
    int hcm, lcm, mil;
    int freeplane;

    mil = roundavg(pp->pl_crew * eff);
    /* Always use at least 1 mil to build a plane */
    if (mil == 0 && pp->pl_crew > 0)
        mil = 1;
    hcm = roundavg(pp->pl_hcm * eff);
    lcm = roundavg(pp->pl_lcm * eff);
    if (sp->sct_type != SCT_AIRPT && !player->god) {
        pr("Planes must be built in airports.\n");
        return 0;
    }
    if (sp->sct_effic < 60 && !player->god) {
        pr("Sector %s is not 60%% efficient.\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
    if (vec[I_LCM] < lcm || vec[I_HCM] < hcm) {
        pr("Not enough materials in %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
    avail = (PLN_BLD_WORK(pp->pl_lcm, pp->pl_hcm) * PLANE_MINEFF + 99) / 100;
    if (sp->sct_avail < avail) {
        pr("Not enough available work in %s to build a %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum), pp->pl_name);
        pr(" (%d available work required)\n", avail);
        return 0;
    }
    cost = pp->pl_cost * PLANE_MINEFF / 100.0;
    if (!build_can_afford(cost, pp->pl_name))
        return 0;
    if (vec[I_MILIT] < mil || (vec[I_MILIT] == 0 && pp->pl_crew > 0)) {
        pr("Not enough military for crew in %s\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }
    if (!trechk(player->cnum, 0, NEWPLN))
        return 0;
    if (!check_sect_ok(sp))
        return 0;
    sp->sct_avail -= avail;
    player->dolcost += cost;
    snxtitem_all(&nstr, EF_PLANE);
    freeplane = 0;
    while (nxtitem(&nstr, &plane)) {
        if (plane.pln_own == 0) {
            freeplane++;
            break;
        }
    }
    if (freeplane == 0) {
        ef_extend(EF_PLANE, 50);
    }
    memset(&plane, 0, sizeof(struct plnstr));
    plane.pln_x = sp->sct_x;
    plane.pln_y = sp->sct_y;
    plane.pln_own = sp->sct_own;
    plane.pln_type = pp - plchr;
    plane.pln_effic = PLANE_MINEFF;
    if (opt_MOB_ACCESS) {
        game_tick_to_now(&plane.pln_access);
        plane.pln_mobil = -(etu_per_update / sect_mob_neg_factor);
    } else {
        plane.pln_mobil = 0;
    }
    plane.pln_mission = 0;
    plane.pln_opx = 0;
    plane.pln_opy = 0;
    plane.pln_radius = 0;
    plane.pln_range = UCHAR_MAX; /* will be adjusted by pln_set_tech() */
    plane.pln_range_max = plane.pln_range;
    plane.pln_wing = 0;
    plane.pln_ship = -1;
    plane.pln_land = -1;
    plane.pln_uid = nstr.cur;
    plane.pln_nuketype = -1;
    plane.pln_harden = 0;
    plane.pln_flags = 0;
    pln_set_tech(&plane, tlev);

    vec[I_LCM] -= lcm;
    vec[I_HCM] -= hcm;
    vec[I_MILIT] -= mil;

    makenotlost(EF_PLANE, plane.pln_own, plane.pln_uid,
                plane.pln_x, plane.pln_y);
    putplane(plane.pln_uid, &plane);
    pr("%s built in sector %s\n", prplane(&plane),
       xyas(sp->sct_x, sp->sct_y, player->cnum));
    return 1;
}

static int
build_tower(struct sctstr *sp, short *vec)
{
    struct sctstr sect;
    int val;
    int newx, newy;
    int avail;
    char *p;
    char buf[1024];
    int good;
    int i;
    int nx;
    int ny;

    if (sp->sct_type != SCT_BSPAN) {
        pr("Bridge towers can only be built from bridge spans.\n");
        return 0;
    }

    if (sp->sct_effic < 60 && !player->god) {
        pr("Sector %s is not 60%% efficient.\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        return 0;
    }

    if (vec[I_HCM] < buil_tower_bh) {
        pr("%s only has %d unit%s of hcm,\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum),
           vec[I_HCM], vec[I_HCM] > 1 ? "s" : "");
        pr("(a bridge tower requires %d)\n", buil_tower_bh);
        return 0;
    }

    if (!build_can_afford(buil_tower_bc, dchr[SCT_BTOWER].d_name))
        return 0;
    avail = (SCT_BLD_WORK(0, buil_tower_bh) * SCT_MINEFF + 99) / 100;
    if (sp->sct_avail < avail) {
        pr("Not enough available work in %s to build a bridge tower\n",
           xyas(sp->sct_x, sp->sct_y, player->cnum));
        pr(" (%d available work required)\n", avail);
        return 0;
    }
    if (!player->argp[3]) {
        pr("Building from %s\n", xyas(sp->sct_x, sp->sct_y, player->cnum));
        nav_map(sp->sct_x, sp->sct_y, 1);
    }
    p = getstarg(player->argp[3], "build tower in what direction? ", buf);
    if (!p || !*p) {
        return 0;
    }
    /* Sanity check time */
    if (!check_sect_ok(sp))
        return 0;

    if ((val = chkdir(*p, DIR_FIRST, DIR_LAST)) < 0) {
        pr("'%c' is not a valid direction...\n", *p);
        direrr(0, 0, 0);
        return 0;
    }
    newx = sp->sct_x + diroff[val][0];
    newy = sp->sct_y + diroff[val][1];
    if (getsect(newx, newy, &sect) == 0 || sect.sct_type != SCT_WATER) {
        pr("%s is not a water sector\n", xyas(newx, newy, player->cnum));
        return 0;
    }

    /* Now, check.  You aren't allowed to build bridge towers
       next to land. */
    good = 0;
    for (i = 1; i <= 6; i++) {
        struct sctstr s2;
        nx = sect.sct_x + diroff[i][0];
        ny = sect.sct_y + diroff[i][1];
        getsect(nx, ny, &s2);
        if ((s2.sct_type != SCT_WATER) &&
            (s2.sct_type != SCT_BTOWER) && (s2.sct_type != SCT_BSPAN)) {
            good = 1;
            break;
        }
    }
    if (good) {
        pr("Bridge towers cannot be built adjacent to land.\n");
        pr("That sector is adjacent to land.\n");
        return 0;
    }

    sp->sct_avail -= avail;
    player->dolcost += buil_tower_bc;
    sect.sct_type = SCT_BTOWER;
    sect.sct_newtype = SCT_BTOWER;
    sect.sct_effic = SCT_MINEFF;
    sect.sct_road = 0;
    sect.sct_rail = 0;
    sect.sct_defense = 0;
    if (opt_MOB_ACCESS) {
        game_tick_to_now(&sect.sct_access);
        sect.sct_mobil = -(etu_per_update / sect_mob_neg_factor);
    } else {
        sect.sct_mobil = 0;
    }
    sect.sct_mines = 0;
    map_set(player->cnum, sect.sct_x, sect.sct_y, dchr[SCT_BTOWER].d_mnem, 2);
    writemap(player->cnum);
    putsect(&sect);
    pr("Bridge tower built in %s\n",
       xyas(sect.sct_x, sect.sct_y, player->cnum));
    vec[I_HCM] -= buil_tower_bh;
    return 1;
}

static int
build_can_afford(double cost, char *what)
{
    struct natstr *natp = getnatp(player->cnum);
    if (natp->nat_money < player->dolcost + cost) {
        pr("Not enough money left to build a %s\n", what);
        return 0;
    }
    return 1;
}

---