522 lines
9.7 KiB
C++
522 lines
9.7 KiB
C++
/*
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* 1541fs.cpp - 1541 emulation in host file system
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*
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* Frodo (C) 1994-1997,2002-2005 Christian Bauer
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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/*
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* Notes:
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* ------
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*
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* - If the directory is opened (file name "$"), a temporary file
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* with the structure of a 1541 directory file is created and
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* opened. It can then be accessed in the same way as all other
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* files.
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*
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* Incompatibilities:
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* ------------------
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*
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* - No "raw" directory reading
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* - No relative/sequential/user files
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* - Only "I" and "UJ" commands implemented
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*/
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#include "sysdeps.h"
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#include "1541fs.h"
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#include "IEC.h"
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#include "main.h"
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#include "Prefs.h"
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// Prototypes
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static bool match(const char *p, const char *n);
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/*
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* Constructor: Prepare emulation
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*/
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FSDrive::FSDrive(IEC *iec, const char *path) : Drive(iec)
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{
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strcpy(orig_dir_path, path);
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dir_path[0] = 0;
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if (change_dir(orig_dir_path)) {
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for (int i=0; i<16; i++)
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file[i] = NULL;
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Reset();
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Ready = true;
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}
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}
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/*
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* Destructor
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*/
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FSDrive::~FSDrive()
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{
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if (Ready) {
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close_all_channels();
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Ready = false;
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}
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}
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/*
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* Change emulation directory
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*/
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bool FSDrive::change_dir(char *dirpath)
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{
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#ifndef __riscos__
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DIR *dir;
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if ((dir = opendir(dirpath)) != NULL) {
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closedir(dir);
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strcpy(dir_path, dirpath);
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strncpy(dir_title, dir_path, 16);
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return true;
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} else
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return false;
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#else
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int Info[4];
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if ((ReadCatalogueInfo(dirpath,Info) & 2) != 0) { // Directory or image file
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strcpy(dir_path, dirpath);
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strncpy(dir_title, dir_path, 16);
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return true;
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} else
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return false;
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#endif
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}
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/*
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* Open channel
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*/
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uint8 FSDrive::Open(int channel, const uint8 *name, int name_len)
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{
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set_error(ERR_OK);
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// Channel 15: Execute file name as command
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if (channel == 15) {
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execute_cmd(name, name_len);
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return ST_OK;
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}
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// Close previous file if still open
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if (file[channel]) {
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fclose(file[channel]);
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file[channel] = NULL;
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}
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if (name[0] == '#') {
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set_error(ERR_NOCHANNEL);
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return ST_OK;
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}
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if (name[0] == '$')
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return open_directory(channel, name + 1, name_len - 1);
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return open_file(channel, name, name_len);
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}
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/*
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* Open file
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*/
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uint8 FSDrive::open_file(int channel, const uint8 *name, int name_len)
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{
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char plain_name[NAMEBUF_LENGTH];
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int plain_name_len;
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int mode = FMODE_READ;
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int type = FTYPE_PRG;
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int rec_len = 0;
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parse_file_name(name, name_len, (uint8 *)plain_name, plain_name_len, mode, type, rec_len, true);
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// Channel 0 is READ, channel 1 is WRITE
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if (channel == 0 || channel == 1) {
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mode = channel ? FMODE_WRITE : FMODE_READ;
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if (type == FTYPE_DEL)
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type = FTYPE_PRG;
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}
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bool writing = (mode == FMODE_WRITE || mode == FMODE_APPEND);
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// Expand wildcards (only allowed on reading)
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if (strchr(plain_name, '*') || strchr(plain_name, '?')) {
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if (writing) {
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set_error(ERR_SYNTAX33);
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return ST_OK;
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} else
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find_first_file(plain_name);
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}
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// Relative files are not supported
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if (type == FTYPE_REL) {
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set_error(ERR_UNIMPLEMENTED);
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return ST_OK;
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}
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// Select fopen() mode according to file mode
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const char *mode_str = "rb";
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switch (mode) {
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case FMODE_WRITE:
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mode_str = "wb";
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break;
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case FMODE_APPEND:
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mode_str = "ab";
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break;
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}
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// Open file
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if (chdir(dir_path))
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set_error(ERR_NOTREADY);
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else if ((file[channel] = fopen(plain_name, mode_str)) != NULL) {
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if (mode == FMODE_READ || mode == FMODE_M) // Read and buffer first byte
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read_char[channel] = fgetc(file[channel]);
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} else
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set_error(ERR_FILENOTFOUND);
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if (chdir(AppDirPath) < 0)
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set_error(ERR_NOTREADY);
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return ST_OK;
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}
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/*
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* Find first file matching wildcard pattern and get its real name
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*/
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// Return true if name 'n' matches pattern 'p'
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static bool match(const char *p, const char *n)
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{
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if (!*p) // Null pattern matches everything
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return true;
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do {
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if (*p == '*') // Wildcard '*' matches all following characters
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return true;
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if ((*p != *n) && (*p != '?')) // Wildcard '?' matches single character
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return false;
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p++; n++;
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} while (*p);
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return !*n;
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}
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void FSDrive::find_first_file(char *pattern)
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{
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#ifndef __riscos__
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DIR *dir;
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struct dirent *de;
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// Open directory for reading and skip '.' and '..'
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if ((dir = opendir(dir_path)) == NULL)
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return;
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de = readdir(dir);
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while (de && (0 == strcmp(".", de->d_name) || 0 == strcmp("..", de->d_name)))
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de = readdir(dir);
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while (de) {
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// Match found? Then copy real file name
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if (match(pattern, de->d_name)) {
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strncpy(pattern, de->d_name, NAMEBUF_LENGTH);
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closedir(dir);
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return;
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}
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// Get next directory entry
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de = readdir(dir);
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}
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closedir(dir);
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#else
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dir_env de;
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char Buffer[NAMEBUF_LENGTH];
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de.offset = 0; de.buffsize = NAMEBUF_LENGTH; de.match = name;
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do {
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de.readno = 1;
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if (ReadDirName(dir_path,Buffer,&de) != NULL)
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de.offset = -1;
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else if (de.offset != -1 && match(name,Buffer)) {
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strncpy(name, Buffer, NAMEBUF_LENGTH);
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return;
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}
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} while (de.readno > 0);
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#endif
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}
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/*
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* Open directory, create temporary file
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*/
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uint8 FSDrive::open_directory(int channel, const uint8 *pattern, int pattern_len)
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{
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char buf[] = "\001\004\001\001\0\0\022\042 \042 00 2A";
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char str[NAMEBUF_LENGTH];
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char *p, *q;
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int i;
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DIR *dir;
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struct dirent *de;
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struct stat statbuf;
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// Special treatment for "$0"
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if (pattern[0] == '0' && pattern[1] == 0) {
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pattern++;
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pattern_len--;
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}
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// Skip everything before the ':' in the pattern
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uint8 *t = (uint8 *)memchr(pattern, ':', pattern_len);
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if (t)
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pattern = t + 1;
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// Convert pattern to ASCII
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char ascii_pattern[NAMEBUF_LENGTH];
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petscii2ascii(ascii_pattern, pattern, NAMEBUF_LENGTH);
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// Open directory for reading and skip '.' and '..'
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if ((dir = opendir(dir_path)) == NULL) {
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set_error(ERR_NOTREADY);
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return ST_OK;
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}
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de = readdir(dir);
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while (de && (0 == strcmp(".", de->d_name) || 0 == strcmp("..", de->d_name)))
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de = readdir(dir);
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// Create temporary file
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if ((file[channel] = tmpfile()) == NULL) {
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closedir(dir);
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return ST_OK;
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}
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// Create directory title
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p = &buf[8];
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for (i=0; i<16 && dir_title[i]; i++)
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*p++ = ascii2petscii(dir_title[i]);
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fwrite(buf, 1, 32, file[channel]);
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// Create and write one line for every directory entry
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while (de) {
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// Include only files matching the ascii_pattern
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if (match(ascii_pattern, de->d_name)) {
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// Get file statistics
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if (chdir(dir_path) < 0)
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continue;
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stat(de->d_name, &statbuf);
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if (chdir(AppDirPath) < 0)
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continue;
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// Clear line with spaces and terminate with null byte
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memset(buf, ' ', 31);
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buf[31] = 0;
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p = buf;
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*p++ = 0x01; // Dummy line link
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*p++ = 0x01;
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// Calculate size in blocks (254 bytes each)
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i = (statbuf.st_size + 254) / 254;
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*p++ = i & 0xff;
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*p++ = (i >> 8) & 0xff;
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p++;
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if (i < 10) p++; // Less than 10: add one space
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if (i < 100) p++; // Less than 100: add another space
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// Convert and insert file name
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strcpy(str, de->d_name);
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*p++ = '\"';
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q = p;
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for (i=0; i<16 && str[i]; i++)
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*q++ = ascii2petscii(str[i]);
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*q++ = '\"';
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p += 18;
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// File type
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if (S_ISDIR(statbuf.st_mode)) {
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*p++ = 'D';
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*p++ = 'I';
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*p++ = 'R';
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} else {
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*p++ = 'P';
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*p++ = 'R';
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*p++ = 'G';
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}
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// Write line
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fwrite(buf, 1, 32, file[channel]);
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}
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// Get next directory entry
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de = readdir(dir);
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}
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// Final line
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fwrite("\001\001\0\0BLOCKS FREE. \0\0", 1, 32, file[channel]);
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// Rewind file for reading and read first byte
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rewind(file[channel]);
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read_char[channel] = fgetc(file[channel]);
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// Close directory
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closedir(dir);
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return ST_OK;
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}
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/*
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* Close channel
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*/
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uint8 FSDrive::Close(int channel)
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{
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if (channel == 15) {
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close_all_channels();
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return ST_OK;
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}
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if (file[channel]) {
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fclose(file[channel]);
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file[channel] = NULL;
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}
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return ST_OK;
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}
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/*
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* Close all channels
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*/
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void FSDrive::close_all_channels(void)
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{
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for (int i=0; i<15; i++)
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Close(i);
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cmd_len = 0;
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}
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/*
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* Read from channel
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*/
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uint8 FSDrive::Read(int channel, uint8 &byte)
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{
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int c;
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// Channel 15: Error channel
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if (channel == 15) {
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byte = *error_ptr++;
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if (byte != '\r')
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return ST_OK;
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else { // End of message
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set_error(ERR_OK);
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return ST_EOF;
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}
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}
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if (!file[channel]) return ST_READ_TIMEOUT;
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// Read one byte
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byte = read_char[channel];
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c = fgetc(file[channel]);
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if (c == EOF)
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return ST_EOF;
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else {
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read_char[channel] = c;
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return ST_OK;
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}
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}
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/*
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* Write to channel
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*/
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uint8 FSDrive::Write(int channel, uint8 byte, bool eoi)
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{
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// Channel 15: Collect chars and execute command on EOI
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if (channel == 15) {
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if (cmd_len >= 58)
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return ST_TIMEOUT;
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cmd_buf[cmd_len++] = byte;
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if (eoi) {
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execute_cmd(cmd_buf, cmd_len);
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cmd_len = 0;
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}
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return ST_OK;
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}
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if (!file[channel]) {
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set_error(ERR_FILENOTOPEN);
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return ST_TIMEOUT;
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}
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if (putc(byte, file[channel]) == EOF) {
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set_error(ERR_WRITE25);
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return ST_TIMEOUT;
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}
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return ST_OK;
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}
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/*
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* Execute drive commands
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*/
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// INITIALIZE
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void FSDrive::initialize_cmd(void)
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{
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close_all_channels();
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}
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// VALIDATE
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void FSDrive::validate_cmd(void)
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{
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}
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/*
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* Reset drive
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*/
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void FSDrive::Reset(void)
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{
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close_all_channels();
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cmd_len = 0;
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set_error(ERR_STARTUP);
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}
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