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gemdos.c
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/*
Hatari - gemdos.c
This file is distributed under the GNU General Public License, version 2
or at your option any later version. Read the file gpl.txt for details.
GEMDOS intercept routines.
These are used mainly for hard drive redirection of high level file routines.
Host file names are handled case insensitively, so files on GEMDOS
drive emulation directories may be either in lower or upper case.
Too long file and directory names and names with invalid characters
are converted to TOS compatible 8+3 names, but matching them back to
host names is slower and may match several such filenames (of which
first one will be returned), so using them should be avoided.
Bugs/things to fix:
* Host filenames are in many places limited to 255 chars (same as
on TOS), FILENAME_MAX should be used if that's a problem.
* rmdir routine, can't remove dir with files in it. (another tos/unix difference)
* Fix bugs, there are probably a few lurking around in here..
*/
const char Gemdos_fileid[] = "Hatari gemdos.c";
#include <config.h>
#include <sys/stat.h>
#if HAVE_STATVFS
#include <sys/statvfs.h>
#endif
#include <sys/types.h>
#if HAVE_UTIME_H
#include <utime.h>
#elif HAVE_SYS_UTIME_H
#include <sys/utime.h>
#endif
#include <time.h>
#include <ctype.h>
#include <unistd.h>
#include <errno.h>
#include <inttypes.h>
#include "main.h"
#include "cart.h"
#include "configuration.h"
#include "file.h"
#include "floppy.h"
#include "ide.h"
#include "inffile.h"
#include "hdc.h"
#include "ncr5380.h"
#include "gemdos.h"
#include "gemdos_defines.h"
#include "log.h"
#include "m68000.h"
#include "memorySnapShot.h"
#include "printer.h"
#include "statusbar.h"
#include "scandir.h"
#include "stMemory.h"
#include "str.h"
#include "tos.h"
#include "hatari-glue.h"
#include "maccess.h"
#include "symbols.h"
/* Maximum supported length of a GEMDOS path: */
#define MAX_GEMDOS_PATH 256
#define BASEPAGE_SIZE (0x80+0x80) /* info + command line */
#define BASEPAGE_OFFSET_DTA 0x20
#define BASEPAGE_OFFSET_PARENT 0x24
/* Have we re-directed GemDOS vector to our own routines yet? */
bool bInitGemDOS;
/* structure with all the drive-specific data for our emulated drives,
* used by GEMDOS_EMU_ON macro
*/
EMULATEDDRIVE **emudrives = NULL;
#define ISHARDDRIVE(Drive) (Drive!=-1)
/*
Disk Transfer Address (DTA)
*/
#define TOS_NAMELEN 14
typedef struct {
/* GEMDOS internals */
Uint8 index[2];
Uint8 magic[4];
char dta_pat[TOS_NAMELEN]; /* unused */
char dta_sattrib; /* unused */
/* TOS API */
char dta_attrib;
Uint8 dta_time[2];
Uint8 dta_date[2];
Uint8 dta_size[4];
char dta_name[TOS_NAMELEN];
} DTA;
/* PopulateDTA() return values */
typedef enum {
DTA_ERR = -1,
DTA_OK = 0,
DTA_SKIP = 1
} dta_ret_t;
#define DTA_MAGIC_NUMBER 0x12983476
#define DTA_CACHE_INC 256 /* DTA cache initial and increment size (grows on demand) */
#define DTA_CACHE_MAX 4096 /* max DTA cache size (multiple of DTA_CACHE_INC) */
#define BASE_FILEHANDLE 64 /* Our emulation handles - MUST not be valid TOS ones, but MUST be <256 */
#define MAX_FILE_HANDLES 32 /* We can allow 32 files open at once */
/*
DateTime structure used by TOS call $57 f_dtatime
Changed to fix potential problem with alignment.
*/
typedef struct {
Uint16 timeword;
Uint16 dateword;
} DATETIME;
#define UNFORCED_HANDLE -1
static struct {
int Handle;
Uint32 Basepage;
} ForcedHandles[5]; /* (standard) handles aliased to emulated handles */
typedef struct
{
bool bUsed;
char szMode[4]; /* enough for all used fopen() modes: rb/rb+/wb+ */
Uint32 Basepage;
FILE *FileHandle;
/* TODO: host path might not fit into this */
char szActualName[MAX_GEMDOS_PATH]; /* used by F_DATIME (0x57) */
} FILE_HANDLE;
typedef struct
{
bool bUsed;
Uint32 addr; /* ST-RAM DTA address for matching reused entries */
int nentries; /* number of entries in fs directory */
int centry; /* current entry # */
struct dirent **found; /* legal files */
char path[MAX_GEMDOS_PATH]; /* sfirst path */
} INTERNAL_DTA;
static FILE_HANDLE FileHandles[MAX_FILE_HANDLES];
static INTERNAL_DTA *InternalDTAs;
static int DTACount; /* Current DTA cache size */
static Uint16 DTAIndex; /* Circular index into above */
static Uint16 CurrentDrive; /* Current drive (0=A,1=B,2=C etc...) */
static Uint32 act_pd; /* Used to get a pointer to the current basepage */
static Uint16 nAttrSFirst; /* File attribute for SFirst/Snext */
static Uint32 CallingPC; /* Program counter from caller */
static uint32_t nSavedPexecParams;
#if defined(WIN32) && !defined(mkdir)
#define mkdir(name,mode) mkdir(name)
#endif /* WIN32 */
#ifndef S_IRGRP
#define S_IRGRP 0
#define S_IROTH 0
#endif
/* set to 1 if you want to see debug output from pattern matching */
#define DEBUG_PATTERN_MATCH 0
/*-------------------------------------------------------*/
/**
* Routine to convert time and date to GEMDOS format.
* Originally from the STonX emulator. (cheers!)
*/
static void GemDOS_DateTime2Tos(time_t t, DATETIME *DateTime, const char *fname)
{
struct tm *x;
/* localtime takes DST into account */
x = localtime(&t);
if (x == NULL)
{
Log_Printf(LOG_WARN, "'%s' timestamp is invalid for (Windows?) localtime(), defaulting to TOS epoch!", fname);
DateTime->dateword = 1|(1<<5); /* 1980-01-01 */
DateTime->timeword = 0;
return;
}
/* Bits: 0-4 = secs/2, 5-10 = mins, 11-15 = hours (24-hour format) */
DateTime->timeword = (x->tm_sec>>1)|(x->tm_min<<5)|(x->tm_hour<<11);
/* Bits: 0-4 = day (1-31), 5-8 = month (1-12), 9-15 = years (since 1980) */
DateTime->dateword = x->tm_mday | ((x->tm_mon+1)<<5)
| (((x->tm_year-80 > 0) ? x->tm_year-80 : 0) << 9);
}
/*-----------------------------------------------------------------------*/
/**
* Populate a DATETIME structure with file info. Handle needs to be
* validated before calling. Return true on success.
*/
static bool GemDOS_GetFileInformation(int Handle, DATETIME *DateTime)
{
const char *fname = FileHandles[Handle].szActualName;
struct stat fstat;
if (stat(fname, &fstat) == 0)
{
GemDOS_DateTime2Tos(fstat.st_mtime, DateTime, fname);
return true;
}
return false;
}
/*-----------------------------------------------------------------------*/
/**
* Set given file date/time from given DATETIME. Handle needs to be
* validated before calling. Return true on success.
*/
static bool GemDOS_SetFileInformation(int Handle, DATETIME *DateTime)
{
const char *filename;
struct utimbuf timebuf;
struct stat filestat;
struct tm timespec;
/* make sure Hatari itself doesn't need to write/modify
* the file after it's modification time is changed.
*/
fflush(FileHandles[Handle].FileHandle);
/* use host modification times instead of Atari ones? */
if (ConfigureParams.HardDisk.bGemdosHostTime)
return true;
filename = FileHandles[Handle].szActualName;
/* Bits: 0-4 = secs/2, 5-10 = mins, 11-15 = hours (24-hour format) */
timespec.tm_sec = (DateTime->timeword & 0x1F) << 1;
timespec.tm_min = (DateTime->timeword & 0x7E0) >> 5;
timespec.tm_hour = (DateTime->timeword & 0xF800) >> 11;
/* Bits: 0-4 = day (1-31), 5-8 = month (1-12), 9-15 = years (since 1980) */
timespec.tm_mday = (DateTime->dateword & 0x1F);
timespec.tm_mon = ((DateTime->dateword & 0x1E0) >> 5) - 1;
timespec.tm_year = ((DateTime->dateword & 0xFE00) >> 9) + 80;
/* check whether DST should be taken into account */
timespec.tm_isdst = -1;
/* set new modification time */
timebuf.modtime = mktime(×pec);
/* but keep previous access time */
if (stat(filename, &filestat) != 0)
return false;
timebuf.actime = filestat.st_atime;
if (utime(filename, &timebuf) != 0)
return false;
// fprintf(stderr, "set date '%s' for %s\n", asctime(×pec), name);
return true;
}
/*-----------------------------------------------------------------------*/
/**
* Convert from FindFirstFile/FindNextFile attribute to GemDOS format
*/
static Uint8 GemDOS_ConvertAttribute(mode_t mode)
{
Uint8 Attrib = 0;
/* Directory attribute */
if (S_ISDIR(mode))
Attrib |= GEMDOS_FILE_ATTRIB_SUBDIRECTORY;
/* Read-only attribute */
if (!(mode & S_IWUSR))
Attrib |= GEMDOS_FILE_ATTRIB_READONLY;
/* TODO, Other attributes:
* - GEMDOS_FILE_ATTRIB_HIDDEN (file not visible on desktop/fsel)
* - GEMDOS_FILE_ATTRIB_ARCHIVE (file written after being backed up)
* ?
*/
return Attrib;
}
/*-----------------------------------------------------------------------*/
/**
* Populate the DTA buffer with file info.
* @return DTA_OK if entry is ok, DTA_SKIP if it should be skipped, DTA_ERR on errors
*/
static dta_ret_t PopulateDTA(char *path, struct dirent *file, DTA *pDTA, Uint32 DTA_Gemdos)
{
/* TODO: host file path can be longer than MAX_GEMDOS_PATH */
char tempstr[MAX_GEMDOS_PATH];
struct stat filestat;
DATETIME DateTime;
int nFileAttr, nAttrMask;
if (snprintf(tempstr, sizeof(tempstr), "%s%c%s",
path, PATHSEP, file->d_name) >= (int)sizeof(tempstr))
{
Log_Printf(LOG_ERROR, "PopulateDTA: path is too long.\n");
return DTA_ERR;
}
if (stat(tempstr, &filestat) != 0)
{
/* skip file if it doesn't exist, otherwise return an error */
dta_ret_t ret = (errno == ENOENT ? DTA_SKIP : DTA_ERR);
perror(tempstr);
return ret;
}
if (!pDTA)
return DTA_ERR; /* no DTA pointer set */
/* Check file attributes (check is done according to the Profibuch) */
nFileAttr = GemDOS_ConvertAttribute(filestat.st_mode);
nAttrMask = nAttrSFirst|GEMDOS_FILE_ATTRIB_WRITECLOSE|GEMDOS_FILE_ATTRIB_READONLY;
if (nFileAttr != 0 && !(nAttrMask & nFileAttr))
return DTA_SKIP;
GemDOS_DateTime2Tos(filestat.st_mtime, &DateTime, tempstr);
/* Atari memory modified directly through pDTA members -> flush the data cache */
M68000_Flush_Data_Cache(DTA_Gemdos, sizeof(DTA));
/* convert to atari-style uppercase */
Str_Filename2TOSname(file->d_name, pDTA->dta_name);
#if DEBUG_PATTERN_MATCH
fprintf(stderr, "DEBUG: GEMDOS: host: %s -> GEMDOS: %s\n",
file->d_name, pDTA->dta_name);
#endif
do_put_mem_long(pDTA->dta_size, filestat.st_size);
do_put_mem_word(pDTA->dta_time, DateTime.timeword);
do_put_mem_word(pDTA->dta_date, DateTime.dateword);
pDTA->dta_attrib = nFileAttr;
return DTA_OK;
}
/*-----------------------------------------------------------------------*/
/**
* Clear given DTA cache structure.
*/
static void ClearInternalDTA(int idx)
{
int i;
/* clear the old DTA structure */
if (InternalDTAs[idx].found != NULL)
{
for (i = 0; i < InternalDTAs[idx].nentries; i++)
free(InternalDTAs[idx].found[i]);
free(InternalDTAs[idx].found);
InternalDTAs[idx].found = NULL;
}
InternalDTAs[idx].nentries = 0;
InternalDTAs[idx].bUsed = false;
}
/*-----------------------------------------------------------------------*/
/**
* Clear all DTA cache structures.
*
* If there are no DTA structures yet, allocate default amount
*/
static void GemDOS_ClearAllInternalDTAs(void)
{
int i;
if (!InternalDTAs)
{
DTACount = DTA_CACHE_INC;
InternalDTAs = calloc(DTACount, sizeof(*InternalDTAs));
assert(InternalDTAs);
}
for(i = 0; i < DTACount; i++)
{
ClearInternalDTA(i);
}
DTAIndex = 0;
}
/*-----------------------------------------------------------------------*/
/**
* Match a TOS file name to a dir mask.
*/
static bool fsfirst_match(const char *pat, const char *name)
{
const char *dot, *p=pat, *n=name;
if (name[0] == '.')
return false; /* skip .* files */
dot = strrchr(name, '.'); /* '*' matches everything except last dot in name */
if (dot && p[0] == '*' && p[1] == 0)
return false; /* plain '*' must not match anything with extension */
while (*n)
{
if (*p=='*')
{
while (*n && n != dot)
n++;
p++;
}
else if (*p=='?' && *n)
{
n++;
p++;
}
else if (toupper((unsigned char)*p++) != toupper((unsigned char)*n++))
return false;
}
/* printf("'%s': '%s' -> '%s' : '%s' -> %d\n", name, pat, n, p); */
/* The traversed name matches the pattern, if pattern also
* ends here, or with '*'. '*' for extension matches also
* filenames without extension, so pattern ending with
* '.*' will also be a match.
*/
return (
(p[0] == 0) ||
(p[0] == '*' && p[1] == 0) ||
(p[0] == '.' && p[1] == '*' && p[2] == 0)
);
}
/*-----------------------------------------------------------------------*/
/**
* Parse directory from sfirst mask
* - e.g.: input: "hdemudir/auto/mask*.*" outputs: "hdemudir/auto"
*/
static void fsfirst_dirname(const char *string, char *newstr)
{
int i=0;
strcpy(newstr, string);
/* convert to front slashes and go to end of string. */
while (newstr[i] != '\0')
{
if (newstr[i] == '\\')
newstr[i] = PATHSEP;
i++;
}
/* find last slash and terminate string */
while (i && newstr[i] != PATHSEP)
i--;
newstr[i] = '\0';
}
/*-----------------------------------------------------------------------*/
/**
* Return directory mask part from the given string
*/
static const char* fsfirst_dirmask(const char *string)
{
const char *lastsep;
lastsep = strrchr(string, PATHSEP);
if (lastsep)
return lastsep + 1;
else
return string;
}
/*-----------------------------------------------------------------------*/
/**
* Close given internal file handle if it's still in use
* and (always) reset handle variables
*/
static void GemDOS_CloseFileHandle(int i)
{
if (FileHandles[i].bUsed)
fclose(FileHandles[i].FileHandle);
FileHandles[i].FileHandle = NULL;
FileHandles[i].Basepage = 0;
FileHandles[i].bUsed = false;
}
/**
* Un-force given file handle
*/
static void GemDOS_UnforceFileHandle(int i)
{
ForcedHandles[i].Handle = UNFORCED_HANDLE;
ForcedHandles[i].Basepage = 0;
}
/**
* Clear & un-force all file handles
*/
static void GemDOS_ClearAllFileHandles(void)
{
int i;
for(i = 0; i < ARRAY_SIZE(FileHandles); i++)
{
GemDOS_CloseFileHandle(i);
}
for(i = 0; i < ARRAY_SIZE(ForcedHandles); i++)
{
GemDOS_UnforceFileHandle(i);
}
}
/*-----------------------------------------------------------------------*/
/**
* Initialize GemDOS/PC file system
*/
void GemDOS_Init(void)
{
bInitGemDOS = false;
GemDOS_ClearAllFileHandles();
GemDOS_ClearAllInternalDTAs();
}
/*-----------------------------------------------------------------------*/
/**
* Initialize GemDOS drives current paths (to drive root)
*/
static void GemDOS_InitCurPaths(void)
{
int i;
if (emudrives)
{
for (i = 0; i < MAX_HARDDRIVES; i++)
{
if (emudrives[i])
{
/* Initialize current directory to the root of the drive */
strcpy(emudrives[i]->fs_currpath, emudrives[i]->hd_emulation_dir);
File_AddSlashToEndFileName(emudrives[i]->fs_currpath);
}
}
}
}
/*-----------------------------------------------------------------------*/
/**
* Reset GemDOS file system
*/
void GemDOS_Reset(void)
{
GemDOS_Init();
GemDOS_InitCurPaths();
/* Reset */
act_pd = 0;
CurrentDrive = nBootDrive;
Symbols_RemoveCurrentProgram();
INF_CreateOverride();
}
/*-----------------------------------------------------------------------*/
/**
* Routine to check the Host OS HDD path for a Drive letter sub folder
*/
static bool GEMDOS_DoesHostDriveFolderExist(char* lpstrPath, int iDrive)
{
bool bExist = false;
Log_Printf(LOG_DEBUG, "Checking GEMDOS %c: HDD: %s\n", 'A'+iDrive, lpstrPath);
if (access(lpstrPath, F_OK) != 0 )
{
/* Try lower case drive letter instead */
int iIndex = strlen(lpstrPath)-1;
lpstrPath[iIndex] = tolower((unsigned char)lpstrPath[iIndex]);
}
/* Check if it's a HDD identifier (or other emulated device)
* and if the file/folder is accessible (security basis) */
if (iDrive > 1 && access(lpstrPath, F_OK) == 0 )
{
struct stat status;
if (stat(lpstrPath, &status) == 0 && (status.st_mode & S_IFDIR) != 0)
{
bExist = true;
}
else
{
Log_Printf(LOG_WARN, "Not suitable as GEMDOS HDD dir: %s\n", lpstrPath);
}
}
return bExist;
}
/**
* Determine upper limit of partitions that should be emulated.
*
* @return true if multiple GEMDOS partitions should be emulated, false otherwise
*/
static bool GemDOS_DetermineMaxPartitions(int *pnMaxDrives)
{
struct dirent **files;
int count, i, last;
char letter;
bool bMultiPartitions;
*pnMaxDrives = 0;
/* Scan through the main directory to see whether there are just single
* letter sub-folders there (then use multi-partition mode) or if
* arbitrary sub-folders are there (then use single-partition mode)
*/
count = scandir(ConfigureParams.HardDisk.szHardDiskDirectories[0], &files, 0, alphasort);
if (count < 0)
{
Log_Printf(LOG_ERROR, "GEMDOS hard disk emulation failed:\n "
"Can not access '%s'.\n", ConfigureParams.HardDisk.szHardDiskDirectories[0]);
return false;
}
else if (count <= 2)
{
/* Empty directory Only "." and ".."), assume single partition mode */
last = 1;
bMultiPartitions = false;
}
else
{
bMultiPartitions = true;
/* Check all files in the directory */
last = 0;
for (i = 0; i < count; i++)
{
letter = toupper((unsigned char)files[i]->d_name[0]);
if (!letter || letter == '.')
{
/* Ignore hidden files like "." and ".." */
continue;
}
if (letter < 'C' || letter > 'Z' || files[i]->d_name[1])
{
/* folder with name other than C-Z...
* (until Z under MultiTOS, to P otherwise)
* ... so use single partition mode! */
last = 1;
bMultiPartitions = false;
break;
}
/* alphasort isn't case insensitive */
letter = letter - 'C' + 1;
if (letter > last)
last = letter;
}
}
if (last > MAX_HARDDRIVES)
*pnMaxDrives = MAX_HARDDRIVES;
else
*pnMaxDrives = last;
/* Free file list */
for (i = 0; i < count; i++)
free(files[i]);
free(files);
return bMultiPartitions;
}
/*-----------------------------------------------------------------------*/
/**
* Initialize a GEMDOS drive.
* Supports up to MAX_HARDDRIVES HDD units.
*/
void GemDOS_InitDrives(void)
{
int i;
int nMaxDrives;
int DriveNumber;
int SkipPartitions;
int ImagePartitions;
bool bMultiPartitions;
bMultiPartitions = GemDOS_DetermineMaxPartitions(&nMaxDrives);
/* initialize data for harddrive emulation: */
if (nMaxDrives > 0 && !emudrives)
{
emudrives = calloc(MAX_HARDDRIVES, sizeof(EMULATEDDRIVE *));
if (!emudrives)
{
perror("GemDOS_InitDrives");
return;
}
}
ImagePartitions = nAcsiPartitions + nScsiPartitions + nIDEPartitions;
if (ConfigureParams.HardDisk.nGemdosDrive == DRIVE_SKIP)
SkipPartitions = ImagePartitions;
else
SkipPartitions = ConfigureParams.HardDisk.nGemdosDrive;
Log_Printf(LOG_DEBUG, "ACSI: %d, SCSI: %d, IDE: %d - GEMDOS skipping %d partitions.\n",
nAcsiPartitions, nScsiPartitions, nIDEPartitions, SkipPartitions);
/* Now initialize all available drives */
for(i = 0; i < nMaxDrives; i++)
{
/* If single partition mode, skip to specified / first free drive */
if (!bMultiPartitions)
{
i += SkipPartitions;
}
/* Allocate emudrives entry for this drive */
emudrives[i] = malloc(sizeof(EMULATEDDRIVE));
if (!emudrives[i])
{
perror("GemDOS_InitDrives");
continue;
}
/* set emulation directory string */
strcpy(emudrives[i]->hd_emulation_dir, ConfigureParams.HardDisk.szHardDiskDirectories[0]);
/* remove trailing slash, if any in the directory name */
File_CleanFileName(emudrives[i]->hd_emulation_dir);
/* Add requisite folder ID */
if (bMultiPartitions)
{
char sDriveLetter[] = { PATHSEP, (char)('C' + i), '\0' };
strcat(emudrives[i]->hd_emulation_dir, sDriveLetter);
}
/* drive number (C: = 2, D: = 3, etc.) */
DriveNumber = 2 + i;
// Check host file system to see if the drive folder for THIS
// drive letter/number exists...
if (GEMDOS_DoesHostDriveFolderExist(emudrives[i]->hd_emulation_dir, DriveNumber))
{
/* map drive */
Log_Printf(LOG_INFO, "GEMDOS HDD emulation, %c: <-> %s.\n",
'A'+DriveNumber, emudrives[i]->hd_emulation_dir);
emudrives[i]->drive_number = DriveNumber;
nNumDrives = i + 3;
/* This letter may already be allocated to the one supported physical disk images
* (depends on how well Atari HD driver and Hatari interpretation of partition
* table(s) match each other).
*/
if (i < ImagePartitions)
Log_Printf(LOG_WARN, "GEMDOS HD drive %c: (may) override ACSI/SCSI/IDE image partitions!\n", 'A'+DriveNumber);
}
else
{
free(emudrives[i]); // Deallocate Memory (save space)
emudrives[i] = NULL;
}
}
/* Set current paths in case Atari -> host GEMDOS path mapping
* is needed before TOS boots GEMDOS up (at which point they're
* also initialized), like happens with autostart INF file
* handling.
*/
GemDOS_InitCurPaths();
}
/*-----------------------------------------------------------------------*/
/**
* Un-init GEMDOS drives
*/
void GemDOS_UnInitDrives(void)
{
int i;
GemDOS_Reset(); /* Close all open files on emulated drive */
if (GEMDOS_EMU_ON)
{
for(i = 0; i < MAX_HARDDRIVES; i++)
{
if (emudrives[i])
{
free(emudrives[i]); /* Release memory */
emudrives[i] = NULL;
nNumDrives -= 1;
}
}
free(emudrives);
emudrives = NULL;
}
}
/*-----------------------------------------------------------------------*/
/**
* Save file handle info. If handle is used, save valid file modification
* timestamp and file position, otherwise dummies.
*/
static void save_file_handle_info(FILE_HANDLE *handle)
{
struct stat fstat;
time_t mtime;
off_t offset;
MemorySnapShot_Store(&handle->bUsed, sizeof(handle->bUsed));
MemorySnapShot_Store(&handle->szMode, sizeof(handle->szMode));
MemorySnapShot_Store(&handle->Basepage, sizeof(handle->Basepage));
MemorySnapShot_Store(&handle->szActualName, sizeof(handle->szActualName));
if (handle->bUsed)
{
offset = ftello(handle->FileHandle);
stat(handle->szActualName, &fstat);
mtime = fstat.st_mtime; /* modification time */
}
else
{
/* avoid warnings about access to undefined data */
offset = 0;
stat("/", &fstat);
mtime = fstat.st_mtime;
}
MemorySnapShot_Store(&mtime, sizeof(mtime));
MemorySnapShot_Store(&offset, sizeof(offset));
}
/*-----------------------------------------------------------------------*/
/**
* Restore saved file handle info. If handle is used, open file, validate
* that file modification timestamp matches, then seek to saved position.
* Restoring order must match one used in save_file_handle_info().
*/
static void restore_file_handle_info(int i, FILE_HANDLE *handle)
{
struct stat fstat;
time_t mtime;
off_t offset;
FILE *fp;
if (handle->bUsed)
fclose(handle->FileHandle);
/* read all to proceed correctly in snapshot */
MemorySnapShot_Store(&handle->bUsed, sizeof(handle->bUsed));
MemorySnapShot_Store(&handle->szMode, sizeof(handle->szMode));
MemorySnapShot_Store(&handle->Basepage, sizeof(handle->Basepage));
MemorySnapShot_Store(&handle->szActualName, sizeof(handle->szActualName));
MemorySnapShot_Store(&mtime, sizeof(mtime));
MemorySnapShot_Store(&offset, sizeof(offset));
handle->FileHandle = NULL;
if (!handle->bUsed)
return;
if (stat(handle->szActualName, &fstat) != 0)
{
handle->bUsed = false;
Log_Printf(LOG_WARN, "GEMDOS handle %d cannot be restored, file missing: %s\n",
i, handle->szActualName);
return;
}
/* assumes time_t is primitive type (unsigned long on Linux) */
if (fstat.st_mtime != mtime)
{
Log_Printf(LOG_WARN, "restored GEMDOS handle %d points to a file that has been modified in meanwhile: %s\n",
i, handle->szActualName);
}
fp = fopen(handle->szActualName, handle->szMode);
if (fp == NULL || fseeko(fp, offset, SEEK_SET) != 0)
{
handle->bUsed = false;
Log_Printf(LOG_WARN, "GEMDOS '%s' handle %d cannot be restored, seek to saved offset %"PRId64" failed for: %s\n",
handle->szMode, i, (int64_t)offset, handle->szActualName);
fclose(fp);
return;
}
handle->FileHandle = fp;
}
/*-----------------------------------------------------------------------*/
/**
* Save/Restore snapshot of local variables('MemorySnapShot_Store' handles type)
*/
void GemDOS_MemorySnapShot_Capture(bool bSave)
{
FILE_HANDLE *finfo;
int i, handles = ARRAY_SIZE(FileHandles);
bool bEmudrivesAvailable;
/* Save/Restore the emudrives structure */
bEmudrivesAvailable = (emudrives != NULL);
MemorySnapShot_Store(&bEmudrivesAvailable, sizeof(bEmudrivesAvailable));
if (bEmudrivesAvailable)
{
if (!emudrives)
{
/* As memory snapshot contained emulated drive(s),
* but currently there are none allocated yet...
* let's do it now!
*/
GemDOS_InitDrives();
}
for(i = 0; i < MAX_HARDDRIVES; i++)
{
int bDummyDrive = false;
if (!emudrives[i])
{
/* Allocate a dummy drive */
emudrives[i] = malloc(sizeof(EMULATEDDRIVE));
if (!emudrives[i])
{
perror("GemDOS_MemorySnapShot_Capture");
continue;
}
memset(emudrives[i], 0, sizeof(EMULATEDDRIVE));
bDummyDrive = true;
}
MemorySnapShot_Store(emudrives[i]->hd_emulation_dir,
sizeof(emudrives[i]->hd_emulation_dir));
MemorySnapShot_Store(emudrives[i]->fs_currpath,
sizeof(emudrives[i]->fs_currpath));
MemorySnapShot_Store(&emudrives[i]->drive_number,
sizeof(emudrives[i]->drive_number));
if (bDummyDrive)
{
free(emudrives[i]);
emudrives[i] = NULL;
}
}
}
/* misc information */
MemorySnapShot_Store(&bInitGemDOS,sizeof(bInitGemDOS));
MemorySnapShot_Store(&act_pd, sizeof(act_pd));
MemorySnapShot_Store(&CurrentDrive, sizeof(CurrentDrive));
MemorySnapShot_Store(&nSavedPexecParams, sizeof(nSavedPexecParams));
/* File handle related information */
MemorySnapShot_Store(&ForcedHandles, sizeof(ForcedHandles));
if (bSave)
{
MemorySnapShot_Store(&handles, sizeof(handles));
for (finfo = FileHandles, i = 0; i < handles; i++, finfo++)
save_file_handle_info(finfo);
}
else
{
int saved_handles;
MemorySnapShot_Store(&saved_handles, sizeof(saved_handles));
assert(saved_handles == handles);
for (finfo = FileHandles, i = 0; i < handles; i++, finfo++)
restore_file_handle_info(i, finfo);
/* DTA file name cache isn't valid anymore */
GemDOS_ClearAllInternalDTAs();
}
}
/*-----------------------------------------------------------------------*/
/**
* Return free PC file handle table index, or -1 if error
*/
static int GemDOS_FindFreeFileHandle(void)
{
int i;
/* Scan our file list for free slot */
for(i = 0; i < ARRAY_SIZE(FileHandles); i++)
{
if (!FileHandles[i].bUsed)
return i;
}
/* Cannot open any more files, return error */
return -1;
}