WIP empdump, %a

Move the bits useful there from src/lib/commands/xdump.c to new
include/xdump.h and src/lib/common/xdump.c.

Make.mk

@@ -104,7 +104,7 @@ deps := $(obj:.o=.d)
 # Library archives:
 libs := $(addprefix lib/, libcommon.a libas.a libgen.a libglobal.a)
 # Programs:
-util := $(addprefix src/util/, $(addsuffix $(EXEEXT), empsched fairland files pconfig))
+util := $(addprefix src/util/, $(addsuffix $(EXEEXT), empdump empsched fairland files pconfig))
 client := src/client/empire$(EXEEXT)
 server := src/server/emp_server$(EXEEXT)
 # Info subjects:

doc/xdump

@@ -174,9 +174,10 @@ precisely specified.  We use EBNF (ISO 14977) for syntax, except we
 use '-' in meta-identifiers and omit the concatenation symbol ','.
 
     table = header { record } footer ;
-    header = "XDUMP" space [ "meta" space ] name space timestamp newline ;
-    name = name-chr { name-chr } ;
-    name-chr = ? ASCII characters 33..126 ? ;
+    header = "XDUMP" space [ "meta" space ]
+    	     identifier space timestamp newline ;
+    identifier = id-chr { id-chr } ;
+    id-char = ? ASCII characters 33..126 except '"#()<>=' ? ;
     timestamp = intnum ;
     footer = "/" number newline ;
     record = [ fields ] newline ;
@@ -211,7 +212,7 @@ Notes:
 
 Semantics:
 
-* The table name in the header is one of the names in xdump table.
+* The table identifier in the header is one of the names in xdump table.
 
 * The timestamp increases monotonically.  It has a noticeable
   granularity: game state may change between an xdump and the next
@@ -524,7 +525,7 @@ EBNF changes:
 
 * Header and footer:
 
-    header = "config" name newline colhdr newline ;
+    header = "config" identifier newline colhdr newline ;
     colhdr = { identifier [ "(" ( intnum | identifier ) ")" ] } [ "..." ] ;
     footer = "/config" newline ;
 
@@ -542,7 +543,7 @@ EBNF changes:
     update.
 
   - The column header is due to the self-containedness requirement.
-    It contains just the essential bit of meta-data: the column name.
+    It contains just the essential bit of meta-data: the column names.
 
 * Symbolic fields:
 
@@ -662,7 +663,7 @@ and section `Objectives':
   enemy ships, nations).
 
   (4) Bandwidth will be minimized (i.e. the format will be as
-  concise as possible) while remaining human readable (i.e. no
+  concise as possible) while remaining human-readable (i.e. no
   binary messages).  [Note that data compression may be added at a later
   date, but if it is added, it will be added on a separate port to
   maintain backwards compatability.]
@@ -735,14 +736,14 @@ f. The data to sync is not readily available the server.
    limited view on certain parts of server game state on certain
    events.
 
-   To be complete, a machine readable protocol must disclose as much
-   information as the human readable output.  Tracking server game
+   To be complete, a machine-readable protocol must disclose as much
+   information as the human-readable output.  Tracking server game
    state changes cannot do that alone.  For instance, lookout tells
    you ship#, owner and location.  That event does not trigger any
    state change on the server!
 
-   To be correct, a machine readable protocol must disclose no more
-   information than the human readable output.  When you observe a
+   To be correct, a machine-readable protocol must disclose no more
+   information than the human-readable output.  When you observe a
    server game state change, you can only guess what event triggered
    it, and what it disclosed to which player.  You're stuck with
    conservative assumptions.  That's the death knell for completeness.
@@ -761,7 +762,7 @@ a shortcut, and it didn't work.  That doesn't mean there's no way at
 all.  I believe the only way to get this done right is by tracking
 *events*.  Whenever something is printed to a player, be it live
 connection or telegram, we need to transmit precisely the same
-information in machine readable form.  Much more work.
+information in machine-readable form.  Much more work.
 
 xdump shares valuable ideas with C_SYNC, e.g. using selector
 meta-data.  It is, however, much more modest in scope.  We're pretty

include/commodity.h

@@ -41,9 +41,11 @@
 #include "item.h"
 
 struct comstr {
+    /* initial part must match struct empobj */
     short ef_type;
     natid com_owner;
     short com_uid;
+    /* end of part matching struct empobj */
     i_type com_type;
     int com_amount;
     float com_price;

include/empobj.h

@@ -56,7 +56,8 @@ struct empobj {
     short uid;
     coord x;		/* is valid if EFF_XY      is set in table def. */
     coord y;		/* is valid if EFF_XY      is set in table def. */
-    signed char type;
+    signed char type;	/* is valid for sectors and units */
+    /* remaining are valid for units */
     signed char effic;
     signed char mobil;
     unsigned char off;
@@ -88,9 +89,11 @@ union empobj_storage {
 
 struct empobj_chr;
 
+#define get_empobj(type, n, p) ef_read((type), (n), (p))
+#define put_empobj(type, n, p) ef_write((type), (n), (p))
+#define get_empobjp(type, n) ((struct empobj *)ef_ptr((type), (n)))
+
 extern char *obj_nameof(struct empobj *gp);
-extern struct empobj *get_empobjp(int type, int id);
-extern int put_empobj(struct empobj *gp);
 extern struct empobj_chr *get_empobj_chr(struct empobj *gp);
 extern char *emp_obj_chr_name(struct empobj *gp);
 extern int get_empobj_mob_max(int type);

include/file.h

@@ -57,7 +57,7 @@ struct empfile {
     int cids;			/* # entries in cache */
     int fids;			/* # entries in table */
     int fd;			/* file descriptor, -1 if not open */
-    /* flags bits EFF_RDONLY, EFF_CUSTOM also vary */
+    /* flags bits EFF_PRIVATE, EFF_CUSTOM also vary */
 
     /* User callbacks */
     void (*init)(int, void *);	/* called after entry creation, unless null */
@@ -86,8 +86,8 @@ struct empfile {
 /* Flags set when table contents is mapped */
 /* Table is entirely in memory */
 #define EFF_MEM		bit(8)
-/* Table is read-only */
-#define EFF_RDONLY	bit(9)
+/* Table is privately mapped: changes don't affect the underlying file */
+#define EFF_PRIVATE	bit(9)
 /* Table is customized (configuration tables only) */
 #define EFF_CUSTOM	bit(10)
 /* Transient flags, only occur in argument of ef_open() */
@@ -97,7 +97,8 @@ struct empfile {
 /*
  * Empire `file types'
  * These are really table IDs.  Some tables are backed by files, some
- * are compiled into the server.
+ * are compiled into the server, some initialized from configuration
+ * files.
  */
 enum {
     /* Error value */

include/prototypes.h

@@ -315,8 +315,8 @@ extern int sct_typematch(char *);
 extern int demand_update_want(int *, int *, int);
 extern int demand_check(void);
 extern int demandupdatecheck(void);
-/* xundump.c */
-extern int xundump(FILE *, char *, int *, int);
+/* xdump.c xundump.c */
+/* in xdump.h */
 
 /*
  * src/lib/gen/ *.c 
@@ -480,7 +480,6 @@ extern int islist(char *);
 /* maps.c */
 extern int do_map(int bmap, int unit_type, char *arg1, char *arg2);
 extern int draw_map(int, char, int, struct nstr_sect *);
-extern int unit_map(int, int, struct nstr_sect *, char *);
 extern int display_region_map(int bmap, int unit_type, coord curx,
 			      coord cury, char *arg);
 extern int bmaps_intersect(natid, natid);

include/sect.h

@@ -48,8 +48,8 @@ struct sctstr {
     short sct_elev;		/* elevation/depth */
     coord sct_x;		/* x coord of sector */
     coord sct_y;		/* y coord of sector */
+    signed char sct_type;	/* sector type */
     /* end of part matching struct empobj */
-    unsigned char sct_type;	/* sector type */
     unsigned char sct_effic;	/* 0% to 100% */
     short sct_mobil;		/* mobility units */
     unsigned char sct_loyal;	/* updates until civilans "converted" */
@@ -65,7 +65,7 @@ struct sctstr {
     short sct_fill;		/* gunk */
     unsigned char sct_work;	/* pct of civ actually working */
     unsigned char sct_coastal;	/* is this a coastal sector? */
-    unsigned char sct_newtype;	/* for changing designations */
+    signed char sct_newtype;	/* for changing designations */
     unsigned char sct_min;	/* ease of mining ore */
     unsigned char sct_gmin;	/* amount of gold ore */
     unsigned char sct_fertil;	/* fertility of soil */

include/trade.h

@@ -41,9 +41,11 @@
 #include "types.h"
 
 struct trdstr {
+    /* initial part must match struct empobj */
     short ef_type;
     natid trd_owner;
     short trd_uid;
+    /* end of part matching struct empobj */
     short trd_type;
     short trd_unitid;
     long trd_price;

include/xdump.h

@@ -0,0 +1,59 @@
+/*
+ *  Empire - A multi-player, client/server Internet based war game.
+ *  Copyright (C) 1986-2008, 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.
+ *
+ *  ---
+ *
+ *  xdump.h: Extended dumps
+ * 
+ *  Known contributors to this file:
+ *     Markus Armbruster, 2008
+ */
+
+#ifndef XDUMP_H
+#define XDUMP_H
+
+#include <stdio.h>
+#include "nsc.h"
+#include "types.h"
+
+/* xdump descriptor */
+struct xdstr {
+    natid cnum;			/* dump for this country */
+    int divine;			/* is this a deity dump? */
+    int human;			/* dump human-readable format */
+    void (*pr)(char *fmt, ...);	/* callback for printing dump */
+};
+
+struct xdstr *xdinit(struct xdstr *, natid, int, void (*)(char *, ...));
+extern void xdhdr(struct xdstr *, char *, int);
+extern void xdcolhdr(struct xdstr *, struct castr[]);
+extern void xdflds(struct xdstr *, struct castr[], void *);
+extern struct valstr *xdeval(struct valstr *, struct xdstr *, nsc_type, void *, ptrdiff_t, int, int);
+extern char *xdprval(struct xdstr *, struct valstr *, char *);
+extern void xdftr(struct xdstr *, int);
+extern int xdmeta(struct xdstr *, int);
+extern int xundump(FILE *, char *, int *, int);
+
+#endif

man/empdump.6

@@ -0,0 +1,57 @@
+.TH EMPDUMP 6
+.SH NAME
+empdump \- Export/import Empire game state
+.SH SYNOPSIS
+.B empdump
+[
+.B \-mtxhv
+]
+[
+.BI \-e " configfile"
+]
+[
+.I dump-file
+]
+.br
+.SH DESCRIPTION
+.B empdump
+imports and exports game state as plain text.
+.SH OPTIONS
+.TP
+.BI \-e " configfile"
+Use game configuration in \fIconfigfile\fR.
+.TP
+.B \-h
+Help.  Print brief usage information and exit.
+.TP
+.TP
+.B \-m
+Use machine-readable format for export.  Import always recognizes both
+machine-readable and human-readable format.
+.TP
+.B \-t
+Test import, don't update game state.
+.TP
+.B \-v
+Print version information and exit.
+.TP
+.B \-x
+Export game state to standard output.
+.SH OPERANDS
+.TP
+.I dump-file
+The file to import.
+.SH "LIMITATIONS"
+.B empdump
+can't export player bmaps, power report, telegrams, announcements,
+message of the day, no-login message and log files.  Exported
+floating-point values may be inexact.  Importing an exported game
+state may not result in identical data files; besides the loss of
+floating-point precision just mentioned, coordinates are normalized,
+and characters beyond a string's terminating zero in a character array
+may be lost.
+FIXME can't change file size, fix or document here
+.SH "SEE ALSO"
+\fIemp_server\fR(6).
+.SH AUTHOR
+Markus Armbruster <armbru@pond.sub.org>

src/lib/commands/expl.c

@@ -196,7 +196,7 @@ explore(void)
 	putsect(&sect);
 	return RET_FAIL;
     }
-    if (chksect.sct_type == '.') {
+    if (chksect.sct_type == SCT_WATER) {
 	pr("Bridge disappeared!\n");
 	getsect(start.sct_x, start.sct_y, &start);
 	start.sct_flags &= ~MOVE_IN_PROGRESS;

src/lib/commands/miss.c

@@ -321,7 +321,7 @@ mission(void)
 	gp->mission = mission;
 	gp->opx = x;
 	gp->opy = y;
-	put_empobj(gp);
+	put_empobj(type, gp->uid, gp);
     }
     if (num == 0) {
 	pr("No %s%s\n", ef_nameof(type), splur(num));

src/lib/commands/nati.c

@@ -74,8 +74,7 @@ nati(void)
 	    mil = sect.sct_item[I_MILIT];
 	    pr("%d%% eff %s at %s has %d civilian%s & %d military\n",
 	       sect.sct_effic,
-	       (sect.sct_type ==
-		SCT_CAPIT ? "capital" : "mountain capital"),
+	       sect.sct_type == SCT_CAPIT ? "capital" : "mountain capital",
 	       xyas(sect.sct_x, sect.sct_y, cnum), civ, splur(civ),
 	       mil);
 	}

src/lib/commands/xdump.c

@@ -28,168 +28,17 @@
  *  xdump.c: Extended dump
  * 
  *  Known contributors to this file:
- *     Markus Armbruster, 2004-2007
+ *     Markus Armbruster, 2004-2008
  */
 
-/*
- * Dump everything under the sun
- *
- * Static game data (configuration):
- * - Item characteristics: ichr[]
- * - Land unit characteristics: lchr[]
- * - Nuke characteristics: nchr[]
- * - Plane characteristics: plchr[]
- * - Product characteristics: pchr[]
- * - Sector designation characteristics: dchr[]
- * - Sector infrastructure characteristics: intrchr[]
- * - Ship characteristics: mchr[]
- * - News item characteristics: rpt[]
- * - News page headings: page_headings[]
- * - Commands: player_coms[] (TODO)
- * - Update schedule: update_time[] (not really static)
- * - Configuration: configkeys[]
- *
- * Dynamic game data:
- * - Sectors: EF_SECTOR (superseding dump)
- * - Land units: EF_LAND (superseding ldump)
- * - Lost: EF_LOST (superseding lost)
- * - Nukes: EF_NUKE (superseding ndump)
- * - Planes: EF_PLANE (superseding pdump)
- * - Ships: EF_SHIP (superseding sdump)
- * - News: EF_NEWS
- * - Treaties: EF_TREATY
- * - Power: EF_POWER (TODO)
- * - Nations: EF_NATION
- * - Loans: EF_LOAN
- * - Map: EF_MAP (TODO)
- * - Bmap: EF_BMAP (TODO)
- * - Market: EF_COMM
- */
-
-/*
- * See doc/xdump for motivation, syntax, semantics, and rationale.
- * Make sure to keep it up-to-date!
- */
-
-/* TODO don't dump stuff that's useless due to options */
-
 #include <config.h>
 
 #include <ctype.h>
-#include <stddef.h>
 #include "commands.h"
 #include "empobj.h"
-#include "match.h"
-#include "news.h"
 #include "optlist.h"
-#include "treaty.h"
 #include "version.h"
-
-/*
- * Evaluate a attribute of an object into VAL, return VAL.
- * TYPE is the attribute's type.
- * PTR points to the context object.
- * The attribute is stored there at offset OFF + IDX * S, where S is
- * its size.
- * LEN is the #array elements if it is an array, else zero.
- */
-static struct valstr *
-xdeval(struct valstr *val,
-       nsc_type type, void *ptr, ptrdiff_t off, int idx, int len)
-{
-    val->val_type = type;
-    val->val_cat = NSC_OFF;
-    val->val_as.sym.off = off;
-    val->val_as.sym.len = len;
-    val->val_as.sym.idx = idx;
-    nstr_exec_val(val, player->cnum, ptr, NSC_NOTYPE);
-    return val;			/* FIXME nstr_exec_val() should return VAL */
-}
-
-/* Dump VAL prefixed with SEP, return " ".  */
-static char *
-xdprval(struct valstr *val, char *sep)
-{
-    unsigned char *s, *e, *l;
-
-    switch (val->val_type) {
-    case NSC_LONG:
-	pr("%s%ld", sep, val->val_as.lng);
-	break;
-    case NSC_DOUBLE:
-	pr("%s%#g", sep, val->val_as.dbl);
-	break;
-    case NSC_STRING:
-	s = (unsigned char *)val->val_as.str.base;
-	if (s) {
-	    pr("%s\"", sep);
-	    l = s + val->val_as.str.maxsz;
-	    /* FIXME maxsz == INT_MAX ! */
-	    for (;;) {
-		for (e = s;
-		     e < l && *e != '"' && *e != '\\' && isgraph(*e);
-		     ++e)
-		    ;
-		pr("%.*s", (int)(e-s), s);
-		if (e < l && *e)
-		    pr("\\%03o", *e++);
-		else
-		    break;
-		s = e;
-	    }
-	    pr("\"");
-	} else
-	    pr("%snil", sep);
-	break;
-    default:
-	CANT_REACH();
-	pr("0");
-    }
-    return " ";
-}
-
-/*
- * Dump field values of a context object.
- * CA[] describes fields.
- * PTR points to context object.
- */
-static void
-xdflds(struct castr ca[], void *ptr)
-{
-    int i, j, n;
-    struct valstr val;
-    char *sep = "";
-
-    for (i = 0; ca[i].ca_name; ++i) {
-	if (ca[i].ca_flags & NSC_DEITY && !player->god)
-	    continue;
-	if (ca[i].ca_flags & NSC_EXTRA)
-	    continue;
-	n = ca[i].ca_type != NSC_STRINGY ? ca[i].ca_len : 0;
-	j = 0;
-	do {
-	    xdeval(&val, ca[i].ca_type, ptr, ca[i].ca_off, j, ca[i].ca_len);
-	    sep = xdprval(&val, sep);
-	} while (++j < n);
-    }
-}
-
-/*
- * Dump header for dump NAME.
- * If META, it's for the meta-data dump rather than the data dump.
- */
-static void
-xdhdr(char *name, int meta)
-{
-    pr("XDUMP %s%s %ld\n", meta ? "meta " : "", name, (long)time(NULL));
-}
-
-/* Dump footer for a dump that dumped N objects.  */
-static void
-xdftr(int n)
-{
-    pr("/%d\n", n);
-}
+#include "xdump.h"
 
 /*
  * Is object P of type TYPE visible to the player?
@@ -265,11 +114,11 @@ xdvisible(int type, void *p)
 }
 
 /*
- * Dump items of type TYPE selected by ARG.
+ * Dump items of type TYPE selected by ARG to XD.
  * Return RET_OK on success, RET_SYN on error.
  */
 static int
-xditem(int type, char *arg)
+xditem(struct xdstr *xd, int type, char *arg)
 {
     struct castr *ca;
     struct nstr_item ni;
@@ -283,59 +132,29 @@ xditem(int type, char *arg)
     if (!snxtitem(&ni, type, arg))
 	return RET_SYN;
 
-    xdhdr(ef_nameof(type), 0);
+    xdhdr(xd, ef_nameof(type), 0);
 
     n = 0;
     while (nxtitem(&ni, buf)) {
 	if (!xdvisible(type, buf))
 	    continue;
 	++n;
-	xdflds(ca, buf);
-	pr("\n");
+	xdflds(xd, ca, buf);
+	xd->pr("\n");
     }
 
-    xdftr(n);
+    xdftr(xd, n);
 
     return RET_OK;
 }
 
 /*
- * Dump meta-data for items of type TYPE.
+ * Dump configkeys[] to XD.
+ * If META, dump meta-data rather than data.
  * Return RET_OK.
  */
 static int
-xdmeta(int type)
-{
-    struct castr *ca = ef_cadef(type);
-    int i;
-    int n = 0;
-
-    if (!ca)
-	return RET_SYN;
-
-    xdhdr(ef_nameof(type), 1);
-
-    for (i = 0; ca[i].ca_name; i++) {
-	if (ca[i].ca_flags & NSC_DEITY && !player->god)
-	    continue;
-	if (ca[i].ca_flags & NSC_EXTRA)
-	    continue;
-	xdflds(mdchr_ca, &ca[i]);
-	pr("\n");
-	n++;
-    }
-
-    xdftr(n);
-
-    return RET_OK;
-}
-
-/*
- * Dump configkeys[], return RET_OK.
- * If META, dump meta-data rather than data.
- */
-static int
-xdver(int meta)
+xdver(struct xdstr *xd, int meta)
 {
     static struct castr vers_ca = {
 	NSC_STRINGY, 0, sizeof(PACKAGE_STRING), 0, "version", EF_BAD
@@ -346,11 +165,11 @@ xdver(int meta)
     struct castr ca;
     struct valstr val;
 
-    xdhdr("version", meta);
+    xdhdr(xd, "version", meta);
 
     if (meta) {
 	n = 0;
-	xdflds(mdchr_ca, &vers_ca);
+	xdflds(xd, mdchr_ca, &vers_ca);
 	pr("\n");
 	n++;
 	for (kp = configkeys; kp->km_key; ++kp) {
@@ -361,39 +180,40 @@ xdver(int meta)
 		ca.ca_off = 0;
 		ca.ca_name = kp->km_key;
 		ca.ca_table = EF_BAD;
-		xdflds(mdchr_ca, &ca);
+		xdflds(xd, mdchr_ca, &ca);
 		pr("\n");
 		n++;
 	    }
 	}
-	xdftr(n);
+	xdftr(xd, n);
 	return RET_OK;
     }
 
-    xdeval(&val, vers_ca.ca_type, version, vers_ca.ca_off, 0, vers_ca.ca_len);
-    sep = xdprval(&val, "");
+    xdeval(&val, xd,
+	   vers_ca.ca_type, version, vers_ca.ca_off, 0, vers_ca.ca_len);
+    sep = xdprval(xd, &val, "");
     for (kp = configkeys; kp->km_key; ++kp) {
 	if (kp->km_type != NSC_NOTYPE && !(kp->km_flags & KM_INTERNAL)) {
-	    xdeval(&val, kp->km_type, kp->km_data, 0, 0, 0);
-	    sep = xdprval(&val, sep);
+	    xdeval(&val, xd, kp->km_type, kp->km_data, 0, 0, 0);
+	    sep = xdprval(xd, &val, sep);
 	}
     }
     pr("\n");
 
-    xdftr(1);
+    xdftr(xd, 1);
 
     return RET_OK;
 }
 
-/* Experimental extended dump command */
 int
 xdump(void)
 {
     char *p;
     char buf[1024];
+    struct xdstr xd;
+    struct natstr *natp;
     int type;
     int meta = 0;
-    struct natstr *natp;
 
     p = getstarg(player->argp[1], "Table name, or meta? ", buf);
     if (p && strcmp(p, "meta") == 0) {
@@ -403,19 +223,20 @@ xdump(void)
     if (!p || !*p)
 	return RET_SYN;
 
+    xdinit(&xd, player->cnum, 0, pr);
     natp = getnatp(player->cnum);
     type = isdigit(p[0]) ? atoi(p) : ef_byname(p);
     if (type >= 0 && type < EF_MAX) {
 	if (meta)
-	    return xdmeta(type);
+	    return xdmeta(&xd, type);
 	else if ((EF_IS_GAME_STATE(type) || EF_IS_VIEW(type))
 		 && !(natp->nat_stat == STAT_ACTIVE || player->god)) {
 	    pr("Access to table %s denied\n", ef_nameof(type));
 	    return RET_FAIL;
 	} else
-	    return xditem(type, player->argp[2]);
+	    return xditem(&xd, type, player->argp[2]);
     } else if (!strncmp(p, "ver", strlen(p))) {
-	return xdver(meta);
+	return xdver(&xd, meta);
     }
 
     return RET_SYN;

src/lib/common/conftab.c

@@ -39,6 +39,7 @@
 #include "optlist.h"
 #include "product.h"
 #include "prototypes.h"
+#include "xdump.h"
 
 static int read_custom_table_file(char *);
 

src/lib/common/file.c

@@ -46,8 +46,10 @@
 #include "nsc.h"
 #include "prototypes.h"
 
+static int ef_remap_cache(struct empfile *, int);
 static int fillcache(struct empfile *, int);
 static int do_write(struct empfile *, void *, int, int);
+static void ef_blank(struct empfile *, void *, int, int);
 
 /*
  * Open the file-backed table TYPE (EF_SECTOR, ...).
@@ -61,7 +63,7 @@ ef_open(int type, int how)
 {
     struct empfile *ep;
     struct flock lock;
-    int oflags, fd, fsiz, size;
+    int oflags, fd, fsiz, nslots;
 
     if (ef_check(type) < 0)
 	return 0;
@@ -73,7 +75,7 @@ ef_open(int type, int how)
     if (CANT_HAPPEN(ep->fd >= 0))
 	return 0;
     oflags = O_RDWR;
-    if (how & EFF_RDONLY)
+    if (how & EFF_PRIVATE)
 	oflags = O_RDONLY;
     if (how & EFF_CREATE)
 	oflags |= O_CREAT | O_TRUNC;
@@ -85,7 +87,7 @@ ef_open(int type, int how)
 	return 0;
     }
 
-    lock.l_type = how & EFF_RDONLY ? F_RDLCK : F_WRLCK;
+    lock.l_type = how & EFF_PRIVATE ? F_RDLCK : F_WRLCK;
     lock.l_whence = SEEK_SET;
     lock.l_start = lock.l_len = 0;
     if (fcntl(fd, F_SETLK, &lock) == -1) {
@@ -116,18 +118,13 @@ ef_open(int type, int how)
 	    }
 	}
     } else {
-	if (how & EFF_MEM)
-	    ep->csize = ep->fids;
-	else
-	    ep->csize = blksize(fd) / ep->size;
-	/* 0 could lead to null cache, which confuses assertions */
-	if (!ep->csize)
-	    ep->csize++;
-	size = ep->csize * ep->size;
 	if (CANT_HAPPEN(ep->cache))
 	    free(ep->cache);
-	ep->cache = malloc(size);
-	if (ep->cache == NULL) {
+	if (how & EFF_MEM)
+	    nslots = ep->fids;
+	else
+	    nslots = blksize(fd) / ep->size;
+	if (!ef_remap_cache(ep, nslots)) {
 	    logerror("Can't open %s: out of memory", ep->file);
 	    close(fd);
 	    return 0;
@@ -148,11 +145,31 @@ ef_open(int type, int how)
 	}
     }
 
-    /*
-     * Could close fd if both EFF_RDONLY and EFF_MEM, but that doesn't
-     * happen, so don't bother.
-     */
+    return 1;
+}
 
+static int
+ef_remap_cache(struct empfile *ep, int nslots)
+{
+    void *cache;
+
+    if (CANT_HAPPEN(ep->flags & EFF_STATIC))
+	return 0;
+    if (CANT_HAPPEN(nslots < 0))
+	nslots = 0;
+
+    /*
+     * Avoid zero slots, because that can lead to null cache, which
+     * would be interpreted as unmapped cache.
+     */
+    if (nslots == 0)
+	nslots++;
+    cache = realloc(ep->cache, nslots * ep->size);
+    if (!cache)
+	return 0;
+
+    ep->cache = cache;
+    ep->csize = nslots;
     return 1;
 }
 
@@ -182,7 +199,8 @@ ef_close(int type)
 }
 
 /*
- * Flush file-backed table TYPE (EF_SECTOR, ...) to disk.
+ * Flush table TYPE (EF_SECTOR, ...) to disk.
+ * Does nothing if the table is privately mapped.
  * Return non-zero on success, zero on failure.
  */
 int
@@ -193,6 +211,8 @@ ef_flush(int type)
     if (ef_check(type) < 0)
 	return 0;
     ep = &empfile[type];
+    if (ep->flags & EFF_PRIVATE)
+	return 1;		/* nothing to do */
     if (CANT_HAPPEN(ep->fd < 0))
 	return 0;
     /*
@@ -201,7 +221,7 @@ ef_flush(int type)
      * allowed only with EFF_MEM.  Assume the whole cash is dirty
      * then.
      */
-    if (!(ep->flags & EFF_RDONLY) && (ep->flags & EFF_MEM))
+    if (ep->flags & EFF_MEM)
 	return do_write(ep, ep->cache, ep->baseid, ep->cids) >= 0;
 
     return 1;
@@ -316,7 +336,8 @@ do_write(struct empfile *ep, void *buf, int id, int count)
     int n, ret;
     char *p;
 
-    if (CANT_HAPPEN(ep->fd < 0 || id < 0 || count < 0))
+    if (CANT_HAPPEN(ep->fd < 0 || (ep->flags & EFF_PRIVATE)
+		    || id < 0 || count < 0))
 	return -1;
 
     if (lseek(ep->fd, id * ep->size, SEEK_SET) == (off_t)-1) {
@@ -344,9 +365,10 @@ do_write(struct empfile *ep, void *buf, int id, int count)
 }
 
 /*
- * Write element ID into file-backed table TYPE from buffer FROM.
+ * Write element ID into table TYPE from buffer FROM.
  * FIXME pass buffer size!
- * Write through cache straight to disk.
+ * If table is file-backed and not privately mapped, write through
+ * cache straight to disk.
  * Cannot write beyond the end of fully cached table (flags & EFF_MEM).
  * Can write at the end of partially cached table.
  * Return non-zero on success, zero on failure.
@@ -360,12 +382,16 @@ ef_write(int type, int id, void *from)
     if (ef_check(type) < 0)
 	return 0;
     ep = &empfile[type];
+    if (CANT_HAPPEN((ep->flags & (EFF_MEM | EFF_PRIVATE)) == EFF_PRIVATE))
+	return 0;
     if (ep->prewrite)
 	ep->prewrite(id, from);
     if (CANT_HAPPEN((ep->flags & EFF_MEM) ? id >= ep->fids : id > ep->fids))
 	return 0;		/* not implemented */
+    if (!(ep->flags & EFF_PRIVATE)) {
 	if (do_write(ep, from, id, 1) < 0)
 	    return 0;
+    }
     if (id >= ep->baseid && id < ep->baseid + ep->cids) {
 	/* update the cache if necessary */
 	to = ep->cache + (id - ep->baseid) * ep->size;
@@ -380,44 +406,66 @@ ef_write(int type, int id, void *from)
 }
 
 /*
- * Extend the file-backed table TYPE by COUNT elements.
+ * Extend table TYPE by COUNT elements.
+ * Any pointers obtained from ef_ptr() become invalid.
  * Return non-zero on success, zero on failure.
  */
 int
 ef_extend(int type, int count)
 {
     struct empfile *ep;
-    void *tmpobj;
-    int id, i, how;
+    char *p;
+    int i, id;
 
     if (ef_check(type) < 0)
 	return 0;
     ep = &empfile[type];
-    if (CANT_HAPPEN(ep->fd < 0 || count < 0))
+    if (CANT_HAPPEN(count < 0))
 	return 0;
 
-    tmpobj = calloc(1, ep->size);
     id = ep->fids;
-    for (i = 0; i < count; i++) {
-	if (ep->init)
-	    ep->init(id + i, tmpobj);
-	if (do_write(ep, tmpobj, id + i, 1) < 0)
-	    break;
-    }
-    free(tmpobj);
-
     if (ep->flags & EFF_MEM) {
-	/* FIXME lazy bastards...  do this right */
-	/* XXX this will cause problems if there are ef_ptrs (to the
-	 * old allocated structure) active when we do the re-open */
-	how = ep->flags & ~EFF_IMMUTABLE;
-	ef_close(type);
-	ef_open(type, how);
-    } else {
-	ep->fids += i;
+	if (id + count > ep->csize) {
+	    if (ep->flags & EFF_STATIC)
+		return 0;
+	    if (!ef_remap_cache(ep, id + count))
+		return 0;
 	}
+	p = ep->cache + id * ep->size;
+	ef_blank(ep, p, id, count);
+	if (!(ep->flags & EFF_PRIVATE)) {
+	    if (do_write(ep, p, id, count) < 0)
+		return 0;
+	}
+	ep->cids += count;
+    } else {
+	/* need a buffer, steal last cache slot */
+	if (ep->cids == ep->csize)
+	    ep->cids--;
+	p = ep->cache + ep->cids * ep->size;
+	for (i = 0; i < count; i++) {
+	    ef_blank(ep, p, id + i, 1);
+	    if (do_write(ep, p, id + i, 1) < 0)
+		return 0;
+	}
+    }
+    ep->fids += count;
+    return 1;
+}
 
-    return i == count;
+/*
+ * Initialize COUNT elements of EP in BUF, starting with element ID.
+ */
+static void
+ef_blank(struct empfile *ep, void *buf, int id, int count)
+{
+    int i;
+
+    memset(buf, 0, count * ep->size);
+    if (ep->init) {
+	for (i = 0; i < count; i++)
+	    ep->init(id + i, (char *)buf + i * ep->size);
+    }
 }
 
 struct castr *

src/lib/common/xdump.c

@@ -0,0 +1,351 @@
+/*
+ *  Empire - A multi-player, client/server Internet based war game.
+ *  Copyright (C) 1986-2008, 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.
+ *
+ *  ---
+ *
+ *  xdump.c: Extended dumps
+ * 
+ *  Known contributors to this file:
+ *     Markus Armbruster, 2008
+ */
+
+/*
+ * Dump everything under the sun
+ *
+ * Static game data (configuration):
+ * - Item characteristics: ichr[]
+ * - Land unit characteristics: lchr[]
+ * - Nuke characteristics: nchr[]
+ * - Plane characteristics: plchr[]
+ * - Product characteristics: pchr[]
+ * - Sector designation characteristics: dchr[]
+ * - Sector infrastructure characteristics: intrchr[]
+ * - Ship characteristics: mchr[]
+ * - News item characteristics: rpt[]
+ * - News page headings: page_headings[]
+ * - Commands: player_coms[] (TODO)
+ * - Update schedule: update_time[] (not really static)
+ * - Configuration: configkeys[]
+ *
+ * Dynamic game data:
+ * - Sectors: EF_SECTOR (superseding dump)
+ * - Land units: EF_LAND (superseding ldump)
+ * - Lost: EF_LOST (superseding lost)
+ * - Nukes: EF_NUKE (superseding ndump)
+ * - Planes: EF_PLANE (superseding pdump)
+ * - Ships: EF_SHIP (superseding sdump)
+ * - News: EF_NEWS
+ * - Treaties: EF_TREATY
+ * - Power: EF_POWER (TODO)
+ * - Nations: EF_NATION
+ * - Loans: EF_LOAN
+ * - Map: EF_MAP (TODO)
+ * - Bmap: EF_BMAP (TODO)
+ * - Market: EF_COMM
+ */
+
+/*
+ * See doc/xdump for motivation, syntax, semantics, and rationale.
+ * Make sure to keep it up-to-date!
+ */
+
+/* TODO don't dump stuff that's useless due to options */
+
+#include <config.h>
+
+#include <ctype.h>
+#include <limits.h>
+#include "file.h"
+#include "nat.h"
+#include "xdump.h"
+
+/*
+ * Initialize XD to dump for country CNUM.
+ * If HUMAN, dump in human-readable format.
+ * Dump is to be delivered through callback PR.
+ * Return XD.
+ */
+struct xdstr *
+xdinit(struct xdstr *xd, natid cnum, int human, void (*pr)(char *fmt, ...))
+{
+    xd->cnum = cnum;
+    xd->divine = getnatp(cnum)->nat_stat == STAT_GOD;
+    xd->human = human;
+    xd->pr = pr;
+    return xd;
+}
+
+/*
+ * Evaluate a attribute of an object into VAL, return VAL.
+ * XD is the xdump descriptor.
+ * TYPE is the attribute's type.
+ * PTR points to the context object.
+ * The attribute is stored there at offset OFF + IDX * S, where S is
+ * its size.
+ * LEN is the #array elements if it is an array, else zero.
+ */
+struct valstr *
+xdeval(struct valstr *val, struct xdstr *xd,
+       nsc_type type, void *ptr, ptrdiff_t off, int idx, int len)
+{
+    val->val_type = type;
+    val->val_cat = NSC_OFF;
+    val->val_as.sym.off = off;
+    val->val_as.sym.len = len;
+    val->val_as.sym.idx = idx;
+    nstr_exec_val(val, xd->cnum, ptr, NSC_NOTYPE);
+    return val;			/* FIXME nstr_exec_val() should return VAL */
+}
+
+/*
+ * Dump string STR to XD with funny characters escaped.
+ * Dump at most N characters.
+ */
+static void
+xdpresc(struct xdstr *xd, char *str, size_t n)
+{
+    unsigned char *s, *e, *l;
+
+    s = (unsigned char *)str;
+    l = s + n;
+    for (;;) {
+	for (e = s;
+	     e < l && *e != '"' && *e != '\\' && isgraph(*e);
+	     ++e)
+	    ;
+	xd->pr("%.*s", (int)(e-s), s);
+	if (e < l && *e)
+	    xd->pr("\\%03o", *e++);
+	else
+	    break;
+	s = e;
+    }
+}
+
+/* Dump VAL in machine readable format, prefixed with SEP, return " ".  */
+static char *
+xdprval_nosym(struct xdstr *xd, struct valstr *val, char *sep)
+{
+    switch (val->val_type) {
+    case NSC_LONG:
+	xd->pr("%s%ld", sep, val->val_as.lng);
+	break;
+    case NSC_DOUBLE:
+#if 1 /* TODO have %a */
+	xd->pr("%s%a", sep, val->val_as.dbl);
+#else
+	xd->pr("%s%#g", sep, val->val_as.dbl);
+#endif
+	break;
+    case NSC_STRING:
+	if (val->val_as.str.base) {
+	    xd->pr("%s\"", sep);
+	    xdpresc(xd, val->val_as.str.base, val->val_as.str.maxsz);
+	    xd->pr("\"");
+	} else
+	    xd->pr("%snil", sep);
+	break;
+    default:
+	CANT_REACH();
+	xd->pr("0");
+    }
+    return " ";
+}
+
+/*
+ * Dump symbol with value KEY from symbol table TYPE to XD.
+ * Prefix with SEP, return " ".
+ */
+static char *
+xdprsym(struct xdstr *xd, int key, int type, char *sep)
+{
+    char *sym = symbol_by_value(key, ef_ptr(type, 0));
+
+    if (CANT_HAPPEN(!sym))
+	xd->pr("%s%ld", sep, key);
+    else {
+	xd->pr("%s", sep);
+	xdpresc(xd, sym, INT_MAX);
+    }
+    return " ";
+}
+
+/*
+ * Dump VAL prefixed with SEP, return " ".
+ * CA describes the field from which the value was fetched.
+ */
+static char *
+xdprval_sym(struct xdstr *xd, struct valstr *val, struct castr *ca, char *sep)
+{
+    unsigned long bit;
+    struct castr *ca_sym;
+    char *sym;
+
+    if (xd->human && val->val_type == NSC_LONG && ca->ca_table != EF_BAD) {
+	ca_sym = ef_cadef(ca->ca_table);
+	if (ca_sym != symbol_ca)
+	    ;
+	else if (ca->ca_flags & NSC_BITS) {
+	    xd->pr("%s(", sep);
+	    sep = "";
+	    for (bit = 1; bit; bit <<= 1) {
+		if (bit & val->val_as.lng)
+		    sep = xdprsym(xd, bit, ca->ca_table, sep);
+	    }
+	    xd->pr(")");
+	    return " ";
+	} else
+	    return xdprsym(xd, val->val_as.lng, ca->ca_table, sep);
+    }
+
+    return xdprval_nosym(xd, val, sep);
+}
+
+/*
+ * Dump VAL prefixed with SEP, return " ".
+ * XD must not be human-readable.
+ */
+char *
+xdprval(struct xdstr *xd, struct valstr *val, char *sep)
+{
+    CANT_HAPPEN(xd->human);
+    return xdprval_nosym(xd, val, sep);
+}
+
+/*
+ * Dump field values of a context object to XD.
+ * CA[] describes fields.
+ * PTR points to context object.
+ */
+void
+xdflds(struct xdstr *xd, struct castr ca[], void *ptr)
+{
+    int i, j, n;
+    struct valstr val;
+    char *sep = "";
+
+    for (i = 0; ca[i].ca_name; ++i) {
+	if (ca[i].ca_flags & NSC_DEITY && !xd->divine)
+	    continue;
+	if (ca[i].ca_flags & NSC_EXTRA)
+	    continue;
+	n = ca[i].ca_type != NSC_STRINGY ? ca[i].ca_len : 0;
+	j = 0;
+	do {
+	    xdeval(&val, xd,
+		   ca[i].ca_type, ptr, ca[i].ca_off, j, ca[i].ca_len);
+	    sep = xdprval_sym(xd, &val, &ca[i], sep);
+	} while (++j < n);
+    }
+}
+
+/*
+ * Dump header for dump NAME to XD.
+ * If META, it's for the meta-data dump rather than the data dump.
+ */
+void
+xdhdr(struct xdstr *xd, char *name, int meta)
+{
+    if (xd->human) {
+	xd->pr("config %s\n", name);
+    } else
+	xd->pr("XDUMP %s%s %ld\n",
+	       meta ? "meta " : "", name, (long)time(NULL));
+}
+
+/*
+ * Dump column header to XD.
+ * CA[] describes fields.
+ * Does nothing unless XD is human-readable.
+ */
+void
+xdcolhdr(struct xdstr *xd, struct castr ca[])
+{
+    int i, j, n;
+    char *sep = "";
+
+    if (!xd->human)
+	return;
+
+    for (i = 0; ca[i].ca_name; ++i) {
+	if (ca[i].ca_flags & NSC_DEITY && !xd->divine)
+	    continue;
+	if (ca[i].ca_flags & NSC_EXTRA)
+	    continue;
+	n = ca[i].ca_type != NSC_STRINGY ? ca[i].ca_len : 0;
+	if (n) {
+	    for (j = 0; j < n; j++) {
+		xd->pr("%s%s(%d)",sep, ca[i].ca_name, j);
+		sep = " ";
+	    }
+	} else {
+	    xd->pr("%s%s", sep, ca[i].ca_name);
+	    sep = " ";
+	}
+    }
+    xd->pr("\n");
+}
+
+/* Dump footer for a dump that dumped N objects to XD.  */
+void
+xdftr(struct xdstr *xd, int n)
+{
+    if (xd->human)
+	xd->pr("/config\n");
+    else
+	xd->pr("/%d\n", n);
+}
+
+/*
+ * Dump meta-data for items of type TYPE to XD.
+ * Return RET_OK.
+ */
+int
+xdmeta(struct xdstr *xd, int type)
+{
+    struct castr *ca = ef_cadef(type);
+    int i;
+    int n = 0;
+
+    if (!ca)
+	return RET_SYN;
+
+    xdhdr(xd, ef_nameof(type), 1);
+    xdcolhdr(xd, ca);
+
+    for (i = 0; ca[i].ca_name; i++) {
+	if (ca[i].ca_flags & NSC_DEITY && !xd->divine)
+	    continue;
+	if (ca[i].ca_flags & NSC_EXTRA)
+	    continue;
+	xdflds(xd, mdchr_ca, &ca[i]);
+	xd->pr("\n");
+	n++;
+    }
+
+    xdftr(xd, n);
+
+    return RET_OK;
+}

src/lib/common/xundump.c

@@ -56,12 +56,14 @@
 #include <ctype.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
 #include <time.h>
 #include "file.h"
 #include "match.h"
 #include "nsc.h"
 #include "optlist.h"
-#include "prototypes.h"
+#include "xdump.h"
 
 static char *fname;		/* Name of file being read */
 static int lineno;		/* Current line number */
@@ -130,21 +132,6 @@ skipfs(FILE *fp)
     return ch;
 }
 
-/*
- * Read an identifier from FP into BUF.
- * BUF must have space for 1024 characters.
- * Return number of characters read on success, -1 on failure.
- */
-static int
-getid(FILE *fp, char *buf)
-{
-    int n;
-    if (fscanf(fp, "%1023[^#()<>=#\" \t\n]%n", buf, &n) != 1
-	|| !isalpha(buf[0]))
-	return -1;
-    return n;
-}
-
 /*
  * Decode escape sequences in BUF.
  * Return BUF on success, null pointer on failure.
@@ -170,6 +157,22 @@ xuesc(char *buf)
     return buf;
 }
 
+/*
+ * Read an identifier from FP into BUF.
+ * BUF must have space for 1024 characters.
+ * Return number of characters read on success, -1 on failure.
+ */
+static int
+getid(FILE *fp, char *buf)
+{
+    int n;
+    if (fscanf(fp, "%1023[^\"#()<>= \t\n]%n", buf, &n) != 1
+	|| !isalpha(buf[0]))
+	return -1;
+    xuesc(buf);
+    return n;
+}
+
 /*
  * Try to read a field name from FP.
  * I is the field number, counting from zero.
@@ -479,17 +482,20 @@ getobj(void)
     int need_sentinel = !EF_IS_GAME_STATE(cur_type);
 
     if (!cur_obj) {
-	cur_obj_is_blank = cur_id >= ep->fids;
+	cur_obj_is_blank = cur_id >= ep->fids - !!need_sentinel;
 	if (cur_obj_is_blank) {
-	    /* TODO grow cache (and possibly file) unless EFF_STATIC */
-	    if (cur_id < ep->csize - !!need_sentinel)
-		ep->cids = ep->fids = cur_id + 1;
-	    /* else: ef_ptr() will fail */
-	}
+	    if (ef_ensure_space(cur_type, cur_id + !!need_sentinel, 1))
 		cur_obj = ef_ptr(cur_type, cur_id);
+	    /* FIXME diagnose out of dynamic memory vs. static table full */
 	    if (!cur_obj)
 		gripe("Can't put ID %d into table %s, it holds only 0..%d.",
-		  cur_id, ep->name, ep->fids - 1);
+		      cur_id, ep->name, ep->fids - !!need_sentinel - 1);
+	} else
+	    cur_obj = ef_ptr(cur_type, cur_id);
+	/* TODO find a less ugly solution */
+	if (EF_IS_GAME_STATE(cur_type) && cur_type != EF_POWER &&
+	    cur_type != EF_MAP && cur_type != EF_BMAP)
+	    *((short *)cur_obj) = cur_type;
     }
 
     return cur_obj;
@@ -958,8 +964,12 @@ xubody(FILE *fp)
 {
     struct empfile *ep = &empfile[cur_type];
     int need_sentinel = !EF_IS_GAME_STATE(cur_type);
+    int old_maxid = ep->fids;
     int i, maxid, ch;
 
+    if (old_maxid == 0 && need_sentinel)
+	ef_ensure_space(cur_type, 0, 1);
+
     maxid = 0;
     for (i = 0;; ++i) {
 	while ((ch = skipfs(fp)) == '\n')
@@ -974,6 +984,12 @@ xubody(FILE *fp)
 	maxid = MAX(maxid, cur_id + 1);
     }
 
+    if (maxid >= old_maxid && need_sentinel) {
+	/* appended a sentinel, strip it off */
+	ep->fids--;
+	ep->cids--;
+    }
+
     if (CANT_HAPPEN(maxid > ep->fids))
 	maxid = ep->fids;
     if (maxid < ep->fids) {
@@ -988,11 +1004,5 @@ xubody(FILE *fp)
 			 ef_nameof(cur_type), ep->fids, maxid);
     }
 
-    if (need_sentinel) {
-	if (CANT_HAPPEN(maxid >= ep->csize))
-	    return gripe("No space for sentinel");
-	memset(ep->cache + ep->size * maxid, 0, ep->size);
-    }
-
     return i;
 }

src/lib/global/file.c

@@ -85,7 +85,7 @@
     SZ((array)), 0, SZ((array)) - 1, SZ((array)) - 1, -1, NULL, NULL, NULL
 
 /* Common configuration table flags */
-#define EFF_CFG (EFF_RDONLY | EFF_MEM | EFF_STATIC)
+#define EFF_CFG (EFF_PRIVATE | EFF_MEM | EFF_STATIC)
 
 struct empfile empfile[] = {
     /*
@@ -95,7 +95,7 @@ struct empfile empfile[] = {
      * bits of flags get their final value.
      * If flags & EFF_STATIC, the cache is mapped here, and members
      * cache, csize get their final value.
-     * Members baseid, cids, fids and the EFF_MEM|EFF_RDONLY bits of
+     * Members baseid, cids, fids and the EFF_MEM|EFF_PRIVATE bits of
      * flags are initialized according the initial cache contents.
      * Member fd is initialized to -1.
      * Members init, postread, prewrite get initialized to NULL, but
@@ -131,7 +131,7 @@ struct empfile empfile[] = {
     {EF_TREATY, "treaty", "treaty", treaty_ca,
      UNMAPPED_CACHE(struct trtstr, 0)},
     {EF_TRADE, "trade", "trade", trade_ca,
-     UNMAPPED_CACHE(struct trdstr, 0)},
+     UNMAPPED_CACHE(struct trdstr, EFF_OWNER)},
     {EF_POWER, "pow", "power", NULL,
      UNMAPPED_CACHE(struct powstr, 0)},
     {EF_NATION, "nat", "nation", nat_ca,
@@ -143,7 +143,7 @@ struct empfile empfile[] = {
     {EF_BMAP, "bmap", "bmap", NULL,
      0, 0, NULL, 0, 0, 0, 0, -1, NULL, NULL, NULL},
     {EF_COMM, "commodity", "commodity", commodity_ca,
-     UNMAPPED_CACHE(struct comstr, 0)},
+     UNMAPPED_CACHE(struct comstr, EFF_OWNER)},
     {EF_LOST, "lost", "lostitems", lost_ca,
      UNMAPPED_CACHE(struct loststr, EFF_OWNER)},
     {EF_REALM, "realm", "realms", realm_ca,
@@ -214,7 +214,8 @@ struct empfile empfile[] = {
     SYMTAB(EF_TREATY_FLAGS, "treaty-flags", treaty_flags),
 
     /* Views */
-    {EF_COUNTRY, "country", NULL, cou_ca, UNMAPPED_CACHE(struct natstr, 0)},
+    {EF_COUNTRY, "country", NULL, cou_ca,
+     UNMAPPED_CACHE(struct natstr, EFF_OWNER)},
 
     /* Sentinel */
     {EF_BAD, NULL, NULL, NULL, 0, 0, NULL, 0, 0, 0, 0, -1, NULL, NULL, NULL},

src/lib/global/nsc.c

@@ -108,7 +108,7 @@ struct castr sect_ca[] = {
     {NSC_SHORT, NSC_DEITY, 0, fldoff(sctstr, sct_elev), "elev", EF_BAD},
     {NSC_XCOORD, NSC_CONST, 0, fldoff(sctstr, sct_x), "xloc", EF_BAD},
     {NSC_YCOORD, NSC_CONST, 0, fldoff(sctstr, sct_y), "yloc", EF_BAD},
-    {NSC_UCHAR, 0, 0, fldoff(sctstr, sct_type), "des", EF_SECTOR_CHR},
+    {NSC_CHAR, 0, 0, fldoff(sctstr, sct_type), "des", EF_SECTOR_CHR},
     {NSC_UCHAR, 0, 0, fldoff(sctstr, sct_effic), "effic", EF_BAD},
     {NSC_SHORT, 0, 0, fldoff(sctstr, sct_mobil), "mobil", EF_BAD},
     {NSC_UCHAR, NSC_DEITY, 0, fldoff(sctstr, sct_loyal), "loyal", EF_BAD},
@@ -123,7 +123,7 @@ struct castr sect_ca[] = {
     {NSC_SHORT, 0, 0, fldoff(sctstr, sct_avail), "avail", EF_BAD},
     {NSC_UCHAR, 0, 0, fldoff(sctstr, sct_work), "work", EF_BAD},
     {NSC_UCHAR, 0, 0, fldoff(sctstr, sct_coastal), "coastal", EF_BAD},
-    {NSC_UCHAR, 0, 0, fldoff(sctstr, sct_newtype), "newdes", EF_SECTOR_CHR},
+    {NSC_CHAR, 0, 0, fldoff(sctstr, sct_newtype), "newdes", EF_SECTOR_CHR},
     {NSC_UCHAR, 0, 0, fldoff(sctstr, sct_min), "min", EF_BAD},
     {NSC_UCHAR, 0, 0, fldoff(sctstr, sct_gmin), "gold", EF_BAD},
     {NSC_UCHAR, 0, 0, fldoff(sctstr, sct_fertil), "fert", EF_BAD},
@@ -542,6 +542,8 @@ struct castr realm_ca[] = {
     {NSC_SHORT, 0, 0, fldoff(realmstr, r_xh), "xh", EF_BAD},
     {NSC_SHORT, 0, 0, fldoff(realmstr, r_yl), "yl", EF_BAD},
     {NSC_SHORT, 0, 0, fldoff(realmstr, r_yh), "yh", EF_BAD},
+    {NSC_TIME, NSC_EXTRA, 0, fldoff(realmstr, r_timestamp), "timestamp",
+     EF_BAD},
     {NSC_NOTYPE, 0, 0, 0, NULL, EF_BAD}
 };
 

src/lib/subs/empobj.c

@@ -57,30 +57,6 @@ obj_nameof(struct empobj *gp)
     return "The Beast #666";
 }
 
-struct empobj *
-get_empobjp(int type, int id)
-{
-    if (CANT_HAPPEN(type == EF_SECTOR || type == EF_BAD))
-	return NULL;
-    return ef_ptr(type, id);
-}
-
-int
-put_empobj(struct empobj *gp)
-{
-    switch (gp->ef_type)
-    {
-    case EF_SECTOR:
-        return ef_write(gp->ef_type, sctoff(gp->x, gp->y), gp);
-    case EF_NATION:
-    case EF_BMAP:
-    case EF_MAP:
-	return ef_write(gp->ef_type, gp->own, gp);
-    default:
-	return ef_write(gp->ef_type, gp->uid, gp);
-    }
-}
-
 struct empobj_chr *
 get_empobj_chr(struct empobj *gp)
 {

src/lib/subs/maps.c

@@ -54,7 +54,8 @@
 #include "xy.h"
 
 static int bmnxtsct(struct nstr_sect *);
-static char map_char(unsigned char type, natid own, int owner_or_god);
+static char map_char(int, natid, int);
+static int unit_map(int, int, struct nstr_sect *, char *);
 
 int
 do_map(int bmap, int unit_type, char *arg, char *map_flags_arg)
@@ -330,7 +331,7 @@ bmnxtsct(struct nstr_sect *np)
  * If OWNER_OR_GOD, the map is for the sector's owner or a deity.
  */
 static char
-map_char(unsigned char type, natid own, int owner_or_god)
+map_char(int type, natid own, int owner_or_god)
 {
     if (CANT_HAPPEN(type > SCT_TYPE_MAX || !dchr[type].d_mnem))
 	return '?';
@@ -341,29 +342,30 @@ map_char(unsigned char type, natid own, int owner_or_god)
     return '?';
 }
 
-int
+static int
 unit_map(int unit_type, int uid, struct nstr_sect *nsp, char *originp)
 {
-    struct empobj *gp;
+    union empobj_storage unit;
     struct range range;
     char *name;
 
-    gp = get_empobjp(unit_type, uid);
-    if (!gp || (gp->own != player->cnum && !player->god) || gp->own == 0)
+    if (!get_empobj(unit_type, uid, &unit))
+	return RET_FAIL;
+    if (!player->owner || unit.gen.own == 0)
 	return RET_FAIL;
 
     if (unit_type == EF_NUKE)
 	*originp = 'n';
     else {
-	if ((name = emp_obj_chr_name(gp)) == NULL)
+	if ((name = emp_obj_chr_name(&unit.gen)) == NULL)
 	    return RET_FAIL;
 	*originp = *name;
     }
 
-    range.lx = xnorm(gp->x - 10);
-    range.hx = xnorm(gp->x + 11);
-    range.ly = ynorm(gp->y - 5);
-    range.hy = ynorm(gp->y + 6);
+    range.lx = xnorm(unit.gen.x - 10);
+    range.hx = xnorm(unit.gen.x + 11);
+    range.ly = ynorm(unit.gen.y - 5);
+    range.hy = ynorm(unit.gen.y + 6);
     xysize_range(&range);
     snxtsct_area(nsp, &range);
     return RET_OK;

src/lib/subs/unitsub.c

@@ -102,23 +102,24 @@ unit_put(struct emp_qelem *list, natid actor)
     struct emp_qelem *qp;
     struct emp_qelem *newqp;
     struct ulist *ulp;
+    struct empobj *unit;
 
     qp = list->q_back;
     while (qp != list) {
 	ulp = (struct ulist *)qp;
+	unit = &ulp->unit.gen;
 	if (actor) {
-	    mpr(actor, "%s stopped at %s\n", obj_nameof(&ulp->unit.gen),
-		xyas(ulp->unit.gen.x, ulp->unit.gen.y,
-		     ulp->unit.gen.own));
-	    if (ulp->unit.ef_type == EF_LAND) {
+	    mpr(actor, "%s stopped at %s\n", obj_nameof(unit),
+		xyas(unit->x, unit->y, unit->own));
+	    if (unit->ef_type == EF_LAND) {
 		if (ulp->mobil < -127)
 		    ulp->mobil = -127;
-		ulp->unit.land.lnd_mobil = ulp->mobil;
+		unit->mobil = ulp->mobil;
 	    }
 	}
-	if (ulp->unit.ef_type == EF_SHIP)
-	    ulp->unit.ship.shp_mobil = (int)ulp->mobil;
-	put_empobj(&ulp->unit.gen);
+	if (unit->ef_type == EF_SHIP)
+	    unit->mobil = (int)ulp->mobil;
+	put_empobj(unit->ef_type, unit->uid, unit);
 	newqp = qp->q_back;
 	emp_remque(qp);
 	free(qp);

src/util/empdump.c

@@ -0,0 +1,444 @@
+/*
+ *  Empire - A multi-player, client/server Internet based war game.
+ *  Copyright (C) 1986-2008, 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.
+ *
+ *  ---
+ *
+ *  empdump.c: Export/import Empire game state
+ * 
+ *  Known contributors to this file:
+ *     Markus Armbruster, 2008
+ */
+
+#include <config.h>
+
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "file.h"
+#include "optlist.h"
+#include "prototypes.h"
+#include "version.h"
+#include "xdump.h"
+
+static void dump_table(int, int);
+static void shp_fixup(void);
+static void pln_fixup(void);
+static void lnd_fixup(void);
+static void nuk_fixup(void);
+
+int
+main(int argc, char *argv[])
+{
+    char *config_file = NULL;
+    char *import = NULL;
+    int export = 0;
+    int private = 0;
+    int human = 1;
+    int opt, i, lineno, type;
+    FILE *impf;
+    int dirty[EF_MAX];
+
+    while ((opt = getopt(argc, argv, "e:mtxhv")) != EOF) {
+	switch (opt) {
+	case 'e':
+	    config_file = optarg;
+	    break;
+	case 'h':
+	    printf("Usage: %s [OPTION]... [DUMP-FILE]\n"
+		   "  -e CONFIG-FILE  configuration file\n"
+		   "                  (default %s)\n"
+		   "  -m              use machine-readable format\n"
+		   "  -t              test import, don't update game state\n"
+		   "  -x              export to standard output\n"
+		   "  -h              display this help and exit\n"
+		   "  -v              display version information and exit\n",
+		   argv[0], dflt_econfig);
+	    exit(0);
+	case 'm':
+	    human = 0;
+	    break;
+	case 't':
+	    private = EFF_PRIVATE;
+	    break;
+	case 'x':
+	    export = 1;
+	    break;
+	case 'v':
+	    printf("%s\n\n%s", version, legal);
+	    exit(0);
+	default:
+	    fprintf(stderr, "Try -h for help.\n");
+	    exit(1);
+	}
+    }
+
+    if (argv[optind])
+	import = argv[optind++];
+
+    if (import) {
+	impf = fopen(import, "r");
+	if (!impf) {
+	    fprintf(stderr, "Cant open %s for reading (%s)\n",
+		    import, strerror(errno));
+	    exit(1);
+	}
+    } else
+	private = EFF_PRIVATE;
+
+    /* read configuration & initialize */
+    empfile_init();
+    if (emp_config(config_file) < 0)
+	exit(1);
+    empfile_fixup();
+    nsc_init();
+    if (read_builtin_tables() < 0)
+	exit(1);
+    if (read_custom_tables() < 0)
+	exit(1);
+    if (chdir(gamedir)) {
+	fprintf(stderr, "Can't chdir to %s (%s)\n",
+		gamedir, strerror(errno));
+	exit(1);
+    }
+    global_init();
+
+    for (i = 0; i < EF_MAX; i++) {
+	if (!EF_IS_GAME_STATE(i))
+	    continue;
+	if (!ef_open(i, EFF_MEM | private))
+	    exit(1);
+    }
+
+    /* import from IMPORT */
+    memset(dirty, 0, sizeof(dirty));
+    if (import) {
+	lineno = 1;
+	while ((type = xundump(impf, import, &lineno, EF_BAD)) >= 0)
+	    dirty[type] = 1;
+	if (type == EF_BAD)
+	    exit(1);
+	shp_fixup();
+	pln_fixup();
+	lnd_fixup();
+	nuk_fixup();
+    }
+
+    if (ef_verify() < 0)
+	exit(1);
+
+    /* export to stdout */
+    if (export) {
+	for (i = 0; i < EF_MAX; i++) {
+	    if (!EF_IS_GAME_STATE(i))
+		continue;
+	    dump_table(i, human);
+	}
+    }
+
+    /* write out imported data */
+    for (i = 0; i < EF_MAX; i++) {
+	if (!EF_IS_GAME_STATE(i))
+	    continue;
+	if (!private && dirty[i]) {
+	    if (!ef_close(i))
+		exit(1);
+	}
+    }
+
+    return 0;
+}
+
+static void
+printf_wrapper(char *fmt, ...)
+{
+    va_list ap;
+
+    va_start(ap, fmt);
+    vprintf(fmt, ap);
+    va_end(ap);
+}
+
+static void
+dump_table(int type, int human)
+{
+    struct xdstr xd;
+    struct castr *ca;
+    int i;
+    void *p;
+
+    ca = ef_cadef(type);
+    if (!ca)
+	return;
+
+    xdinit(&xd, 0, human, printf_wrapper);
+    xdhdr(&xd, ef_nameof(type), 0);
+    xdcolhdr(&xd, ca);
+    for (i = 0; (p = ef_ptr(type, i)); i++) {
+	xdflds(&xd, ca, p);
+	printf("\n");
+    }
+    xdftr(&xd, i);
+}
+
+
+/* FIXME remove need for this */
+
+#include <math.h>
+#include "ship.h"
+#include "plane.h"
+#include "land.h"
+#include "nuke.h"
+
+static int fit_plane_on_ship(struct plnstr *, struct shpstr *);
+static int fit_plane_on_land(struct plnstr *, struct lndstr *);
+
+static void
+shp_fixup(void)
+{
+    int i;
+    struct shpstr *sp;
+
+    for (i = 0; (sp = ef_ptr(EF_SHIP, i)); i++) {
+	if (!sp->shp_own)
+	    continue;
+	shp_set_tech(sp, sp->shp_tech);
+    }
+}
+
+static void
+pln_fixup(void)
+{
+    int i;
+    struct plnstr *pp;
+    struct shpstr *csp;
+    struct lndstr *clp;
+
+    for (i = 0; (pp = ef_ptr(EF_PLANE, i)); i++) {
+	if (!pp->pln_own)
+	    continue;
+	pln_set_tech(pp, pp->pln_tech);
+	csp = ef_ptr(EF_SHIP, pp->pln_ship);
+	clp = ef_ptr(EF_LAND, pp->pln_land);
+	if (csp)
+	    fit_plane_on_ship(pp, csp);
+	else if (clp)
+	    fit_plane_on_land(pp, clp);
+    }
+}
+
+static void
+lnd_fixup(void)
+{
+    int i;
+    struct lndstr *lp;
+    struct shpstr *csp;
+    struct lndstr *clp;
+
+    for (i = 0; (lp = ef_ptr(EF_LAND, i)); i++) {
+	if (!lp->lnd_own)
+	    continue;
+	lnd_set_tech(lp, lp->lnd_tech);
+	csp = ef_ptr(EF_SHIP, lp->lnd_ship);
+	clp = ef_ptr(EF_LAND, lp->lnd_land);
+	if (csp)
+	    csp->shp_nland++;
+	else if (clp)
+	    clp->lnd_nland++;
+    }
+}
+
+static void
+nuk_fixup(void)
+{
+    int i;
+    struct nukstr *np;
+    struct plnstr *cpp;
+
+    for (i = 0; (np = ef_ptr(EF_NUKE, i)); i++) {
+	if (!np->nuk_own)
+	    continue;
+	cpp = ef_ptr(EF_PLANE, np->nuk_plane);
+	if (cpp)
+	    cpp->pln_nuketype = np->nuk_type;
+    }
+}
+
+/* FIXME don't copy this from src/lib/subs/???sub.c */
+
+/*
+ * Set SP's tech to TLEV along with everything else that depends on it.
+ */
+void
+shp_set_tech(struct shpstr *sp, int tlev)
+{
+    struct mchrstr *mcp = mchr + sp->shp_type;
+    int tech_diff = tlev - mcp->m_tech;
+
+    if (CANT_HAPPEN(tech_diff < 0)) {
+      tlev -= tech_diff;
+      tech_diff = 0;
+    }
+
+    sp->shp_tech = tlev;
+    sp->shp_armor = (short)SHP_DEF(mcp->m_armor, tech_diff);
+    sp->shp_speed = (short)SHP_SPD(mcp->m_speed, tech_diff);
+    sp->shp_visib = (short)SHP_VIS(mcp->m_visib, tech_diff);
+    sp->shp_frnge = (short)SHP_RNG(mcp->m_frnge, tech_diff);
+    sp->shp_glim  = (short)SHP_FIR(mcp->m_glim, tech_diff);
+}
+
+/*
+ * Fit a plane of PP's type on ship SP.
+ * Adjust SP's plane counters.
+ * Updating the plane accordingly is the caller's job.
+ * Return whether it fits.
+ */
+static int
+fit_plane_on_ship(struct plnstr *pp, struct shpstr *sp)
+{
+    struct plchrstr *pcp = plchr + pp->pln_type;
+    struct mchrstr *mcp = mchr + sp->shp_type;
+    int wanted;
+
+    if (pcp->pl_flags & P_K) {
+	/* chopper, try chopper slot first */
+	if (sp->shp_nchoppers < mcp->m_nchoppers)
+	    return ++sp->shp_nchoppers;
+	/* else try plane slot */
+	wanted = M_FLY;
+    } else if (pcp->pl_flags & P_E) {
+	/* x-light, try x-light slot first */
+	if (sp->shp_nxlight < mcp->m_nxlight)
+	    return ++sp->shp_nxlight;
+	/* else try plane slot */
+	wanted = M_MSL | M_FLY;
+    } else if (!(pcp->pl_flags & P_L)) {
+	/* not light, no go */
+	wanted = 0;
+    } else if (pcp->pl_flags & P_M) {
+	/* missile, use plane slot */
+	wanted = M_MSL | M_FLY;
+    } else {
+	/* fixed-wing plane, use plane slot */
+	wanted = M_FLY;
+    }
+
+    if ((mcp->m_flags & wanted) == 0)
+	return 0;		/* ship not capable */
+
+    if (sp->shp_nplane < mcp->m_nplanes)
+	return ++sp->shp_nplane;
+
+    return 0;
+}
+
+/*
+ * Fit a plane of PP's type on land unit LP.
+ * Adjust LP's plane counters.
+ * Updating the plane accordingly is the caller's job.
+ * Return whether it fits.
+ */
+static int
+fit_plane_on_land(struct plnstr *pp, struct lndstr *lp)
+{
+    struct plchrstr *pcp = plchr + pp->pln_type;
+    struct lchrstr *lcp = lchr + lp->lnd_type;
+
+    if ((pcp->pl_flags & P_E) && lp->lnd_nxlight < lcp->l_nxlight)
+	return ++lp->lnd_nxlight;
+
+    return 0;
+}
+
+/*
+ * Set PP's tech to TLEV along with everything else that depends on it.
+ */
+void
+pln_set_tech(struct plnstr *pp, int tlev)
+{
+    struct plchrstr *pcp = plchr + pp->pln_type;
+    int tech_diff = tlev - pcp->pl_tech;
+    int limited_range = pp->pln_range < pp->pln_range_max;
+
+    if (CANT_HAPPEN(tech_diff < 0)) {
+      tlev -= tech_diff;
+      tech_diff = 0;
+    }
+
+    pp->pln_tech = tlev;
+    pp->pln_att = PLN_ATTDEF(pcp->pl_att, tech_diff);
+    pp->pln_def = PLN_ATTDEF(pcp->pl_def, tech_diff);
+    pp->pln_acc = PLN_ACC(pcp->pl_acc, tech_diff);
+    pp->pln_range_max = PLN_RAN(pcp->pl_range, tech_diff);
+    pp->pln_load = PLN_LOAD(pcp->pl_load, tech_diff);
+
+    if (!limited_range || pp->pln_range > pp->pln_range_max)
+	pp->pln_range = pp->pln_range_max;
+}
+
+/*
+ * Set LP's tech to TLEV along with everything else that depends on it.
+ */
+void
+lnd_set_tech(struct lndstr *lp, int tlev)
+{
+    struct lchrstr *lcp = lchr + lp->lnd_type;
+    int tech_diff = tlev - lcp->l_tech;
+
+    if (CANT_HAPPEN(tech_diff < 0)) {
+      tlev -= tech_diff;
+      tech_diff = 0;
+    }
+
+    lp->lnd_tech = tlev;
+    lp->lnd_att = (float)LND_ATTDEF(lcp->l_att, tech_diff);
+    lp->lnd_def = (float)LND_ATTDEF(lcp->l_def, tech_diff);
+    lp->lnd_vul = (int)LND_VUL(lcp->l_vul, tech_diff);
+    lp->lnd_spd = (int)LND_SPD(lcp->l_spd, tech_diff);
+    lp->lnd_vis = (int)LND_VIS(lcp->l_vis, tech_diff);
+    lp->lnd_spy = (int)LND_SPY(lcp->l_spy, tech_diff);
+    lp->lnd_rad = (int)LND_RAD(lcp->l_rad, tech_diff);
+    lp->lnd_frg = (int)LND_FRG(lcp->l_frg, tech_diff);
+    lp->lnd_acc = (int)LND_ACC(lcp->l_acc, tech_diff);
+    lp->lnd_dam = (int)LND_DAM(lcp->l_dam, tech_diff);
+    lp->lnd_ammo = (int)LND_AMM(lcp->l_ammo, tech_diff);
+    lp->lnd_aaf = (int)LND_AAF(lcp->l_aaf, tech_diff);
+    lp->lnd_fuelc = (int)LND_FC(lcp->l_fuelc, tech_diff);
+    lp->lnd_fuelu = (int)LND_FU(lcp->l_fuelu, tech_diff);
+    lp->lnd_maxlight = (int)LND_XPL(lcp->l_nxlight, tech_diff);
+    lp->lnd_maxland = (int)LND_MXL(lcp->l_nland, tech_diff);
+}
+
+/* FIXME don't copy this from src/lib/update/nat.c */
+
+double
+logx(double d, double base)
+{
+    if (base == 1.0)
+	return d;
+    return log10(d) / log10(base);
+}