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libtabl.c
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C/C++ Source or Header
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1995-02-28
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8KB
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319 lines
/*
* libtabl.c
*
* Code to handle CTDLTABL.SYS
*/
/*
* history
*
* 87Jan20 HAW Integrity stuff for portability.
* 86Apr24 HAW Modified for fwrite() and fread().
* 85Nov15 HAW Created.
*/
#include "ctdl.h"
/*
* Contents
*
* readSysTab() restores system state from ctdltabl.sys
* common_read() bottleneck for reading
* writeSysTab() saves state of system in CTDLTABL.SYS
* GetDynamic() allocation bottleneck
*/
CONFIG cfg; /* A buncha variables */
LogTable *logTab; /* RAM index of pippuls */
NetTable *netTab; /* RAM index of nodes */
rTable *roomTab; /* RAM index of rooms */
EVENT *EventTab = NULL;
char *indexTable = "ctdlTabl.sys";
struct floor *FloorTab;
int TopFloor;
static char *msg1 = "?old ctdlTabl.sys!";
static struct
{
int checkMark; /* rudimentary integrity */
int cfgSize; /* sizeof cfg */
int logTSize; /* logtab size */
int endMark; /* another integrity check */
}
integrity;
extern char *R_W_ANY;
static void *FindServes(char *name, char *target);
SListBase Serves =
{
NULL, FindServes, NULL, free, NULL
};
/* These two should change from major release to */
#define CHKM 7 /* major release */
#define ENDM 8
/*
* readSysTab()
*
* This function restores the state of system from CTDLTABL.SYS
* returns: TRUE on success, else FALSE
* destroys CTDLTABL.TAB after read, to prevent erroneous re-use
* in the event of a crash.
*
* MS-DOS fun: Here's the map --
* Word 1 == sizeof cfg
* Word 2 == sizeof logTab
* Word 3 == sizeof roomTab
* Word 4 -- thru x == cfg contents
* x -- y == logTab
* y -- z == roomTab
* z -- a == netTab
* EOF
*/
char readSysTab(char kill, char showMsg)
{
FILE *fd;
extern char *READ_ANY;
int rover;
long bytes;
SYS_FILE name;
char caller;
label temp;
caller = cfg.weAre;
if ((fd = fopen(indexTable, READ_ANY)) == NULL)
{
if (showMsg) printf("?no %s!", indexTable); /* Tsk, tsk! */
return(FALSE);
}
if (fread(&integrity, sizeof integrity, 1, fd) != 1)
{
if (showMsg) printf(msg1);
return FALSE;
}
if ( integrity.checkMark != CHKM ||
integrity.endMark != ENDM ||
integrity.cfgSize != sizeof cfg)
{
if (showMsg) printf(msg1);
return(FALSE);
}
if (!common_read(&cfg, (sizeof cfg), 1, fd, showMsg))
return FALSE;
/* Allocations for dynamic parameters */
logTab = (LogTable *) GetDynamic(integrity.logTSize);
roomTab = (rTable *) GetDynamic(MAXROOMS * (sizeof (*roomTab)));
if (cfg.netSize)
netTab = (NetTable *) GetDynamic(sizeof (*netTab) * cfg.netSize);
else
netTab = NULL;
if (cfg.EvNumber)
EventTab = (EVENT *)
GetDynamic(sizeof (*EventTab) * cfg.EvNumber);
/* "- 1" is kludge */
if (integrity.logTSize != sizeof (*logTab) * cfg.MAXLOGTAB)
{
if (showMsg) printf(msg1);
return(FALSE);
}
if (!common_read(logTab, integrity.logTSize, 1, fd, showMsg))
return FALSE;
if (!common_read(roomTab, (sizeof (*roomTab)) * MAXROOMS, 1, fd, showMsg))
return FALSE;
if (cfg.netSize)
{
for (rover = 0; rover < cfg.netSize; rover++)
{
if (!common_read(&netTab[rover], NT_SIZE, 1, fd, showMsg))
return FALSE;
netTab[rover].netTRooms =
(SharedRoom *) GetDynamic(SR_BULK);
if (!common_read(netTab[rover].netTRooms, SR_BULK, 1, fd, showMsg))
return FALSE;
}
}
if (cfg.EvNumber)
{
if (!common_read(EventTab, (sizeof(*EventTab) * cfg.EvNumber), 1, fd,
showMsg))
return FALSE;
}
for (rover = 0; rover < cfg.DomainHandlers; rover++)
{
if (!common_read(temp, NAMESIZE, 1, fd, showMsg))
{
return FALSE;
}
AddData(&Serves, strdup(temp), NULL, FALSE);
}
fclose(fd);
makeSysName(name, "ctdlflr.sys", &cfg.floorArea);
if ((fd = fopen(name, R_W_ANY)) == NULL)
{
if (caller != CONFIGUR)
{
if (showMsg) printf("No floor table!");
return FALSE;
}
}
else
{
totalBytes(&bytes, fd);
FloorTab = (struct floor *) GetDynamic((int) bytes);
if (fread(FloorTab, (int) bytes, 1, fd) != 1)
{
if (showMsg) printf("problem reading floor tab");
fclose(fd);
if (caller != CONFIGUR) return FALSE;
}
else
{
fclose(fd);
TopFloor = (int) bytes/sizeof(*FloorTab);
}
}
if (kill) unlink(indexTable);
crypte(cfg.sysPassword, sizeof cfg.sysPassword, 0);
return(TRUE);
}
/*
* common_read()
*
* This function reads in from file the important stuff.
* returns: TRUE on success, else FALSE
*/
int common_read(void *block, int size, int elements, FILE *fd,
char showMsg)
{
if (size == 0) return TRUE;
if (fread(block, size, elements, fd) != 1)
{
if (showMsg) printf(msg1);
return FALSE;
}
return TRUE;
}
static FILE *fd;
/*
* writeSysTab()
*
* This saves state of system in CTDLTABL.SYS
* returns: TRUE on success, else ERROR
* See readSysTab() to see what the CTDLTABL.SYS map looks like.
*/
static void WriteServers(char *name);
int writeSysTab()
{
extern char *WRITE_ANY;
int rover;
if ((fd = fopen(indexTable, WRITE_ANY)) == NULL)
{
printf("?can't make %s", indexTable);
return(ERROR);
}
/* Write out some key stuff so we can detect bizarreness: */
integrity.checkMark = CHKM;
integrity.endMark = ENDM;
integrity.cfgSize = sizeof cfg;
integrity.logTSize = sizeof (*logTab) * cfg.MAXLOGTAB;
fwrite(&integrity, (sizeof integrity), 1, fd);
crypte(cfg.sysPassword, sizeof cfg.sysPassword, 0);
fwrite(&cfg, (sizeof cfg), 1, fd);
crypte(cfg.sysPassword, sizeof cfg.sysPassword, 0);
fwrite(logTab, (sizeof(*logTab) * cfg.MAXLOGTAB), 1, fd);
fwrite(roomTab, (sizeof (*roomTab)) * MAXROOMS, 1, fd);
for (rover = 0; rover < cfg.netSize; rover++)
{
fwrite(&netTab[rover], NT_SIZE, 1, fd);
fwrite(netTab[rover].netTRooms, SR_BULK, 1, fd);
}
if (cfg.EvNumber)
fwrite(EventTab, (sizeof(*EventTab) * cfg.EvNumber), 1, fd);
RunList(&Serves, WriteServers);
fclose(fd);
return(TRUE);
}
/*
* WriteServers()
*
* This function writes a domain server out to ctdltabl.sys. See DOMAINS.C
* for more information on this list.
*/
static void WriteServers(char *name)
{
fwrite(name, NAMESIZE, 1, fd);
}
/*
* GetDynamic()
*
* This does mallocs with error checking.
*/
void *special_GetDynamic(unsigned size, char *file, int line)
{
void *temp;
char msg[80];
/**
if (cfg.BoolFlags.debug)
{
splitF(NULL,"GetDynamic(%04.4x, %s, %d)\n",size,file,line);
};
**/
if (size == 0) return NULL; /* Simplify code */
temp = calloc(1,size);
/* printf("Requested %d bytes, received address %p\n", size, temp); */
if (temp == NULL)
{
printf("Request for %u bytes of memory failed.\n", size);
sprintf(msg, "Asked for %u bytes, unable to get it.\n", size);
crashout(msg);
}
return temp;
}
/*
* openFile()
*
* This opens one of the .sys files.
*/
void openFile(char *filename, FILE **fd)
{
/* We use fopen here rather than safeopen for link reasons */
if ((*fd = fopen(filename, R_W_ANY)) == NULL)
{
printf("?no %s", filename);
exit(SYSOP_EXIT);
}
}
/*
* FindServes()
*
* This is a find the server function. It's used in the list of domain servers
* to allow us to search for a domain server based on the name of the domain.
*/
static void *FindServes(char *name, char *target)
{
if (cfg.BoolFlags.debug)
{
splitF(NULL,"FindServes( %s, %s)\n",name, target);
};
return (strCmpU(name, target) == SAMESTRING) ? name : NULL;
}