int ctxtChgSize(unsigned tosize)
{ ctxt_t new_context;
assert(tosize);
env_resizeCtrl = ENV_USEUMB | ENV_FIRSTFIT | ENV_ALLOWMOVE;
if(forceLow)
env_resizeCtrl &= ~ENV_USEUMB;
new_context = ctxt? env_setsize(ctxt, tosize) /* alter context */
: env_create(tosize); /* new context */
if(new_context) {
ctxt = new_context;
return E_None;
}
error_out_of_memory();
return E_NoMem;
}
int initialize(void)
{
int comPath; /* path to COMMAND.COM (for COMSPEC/reload) */
char *newTTY; /* what to change TTY to */
int showinfo; /* show initial info only if no command line options */
int key;
int ec; /* error code */
unsigned offs; /* offset into environment segment */
int cmdlen; /* length of command line */
char *cmdline; /* command line duplicated into heap */
char *p, *h, *q;
#ifdef FEATURE_CALL_LOGGING
FILE *f;
#endif
/* Set up the host environment of COMMAND.COM */
/* Install the ^Break handler (see chkCBreak() for more details) */
extern void initCBreakCatcher(void);
initCBreakCatcher();
/* Install INT 24 Critical error handler */
init_error_handler();
/* DOS shells patch the PPID to the own PID, how stupid this is, however,
because then DOS won't terminate them, e.g. when a Critical Error
occurs that is not detected by COMMAND.COM */
oldPSP = OwnerPSP;
atexit(exitfct);
OwnerPSP = _psp;
/* Some elder DOSs may not pass an initialzied environment segment */
if (env_glbSeg && !isMCB(SEG2MCB(env_glbSeg)))
env_setGlbSeg(0); /* Disable the environment */
/* Now parse the command line parameters passed to COMMAND.COM */
/* Preparations */
newTTY = NULL;
comPath = tracemode = 0;
showinfo = 1;
/* Because FreeCom should be executed in a DOS3+ compatible
environment most of the time, it is assumed that its path
can be determined from the environment.
This has the advantage that the string area is accessable
very early in the run.
The name of the current file is string #0. */
if((offs = env_string(0, 0)) != 0) /* OK, environment filled */
grabComFilename(0, (char far *)MK_FP(env_glbSeg, offs));
/* Aquire the command line, there are three possible sources:
1) DOS command line @PSP:0x80 as pascal string,
2) extended DOS command line environment variable CMDLINE,
if peekb(PSP, 0x80) == 127,&
3) MKS command line @ENV:2, if peekb(ENV, 0) == '~'
Currently implemented is version #1 only
*/
cmdlen = peekb(_psp, 0x80);
if(cmdlen < 0 || cmdlen > 126) {
error_corrupt_command_line();
cmdlen = 0;
}
/* duplicate the command line into the local address space */
if((cmdline = malloc(cmdlen + 1)) == NULL) {
error_out_of_memory(); /* Cannot recover from this problem */
return E_NoMem;
}
_fmemcpy((char far*)cmdline, MK_FP(_psp, 0x81), cmdlen);
cmdline[cmdlen] = '\0';
#ifdef FEATURE_CALL_LOGGING
if((f = fopen(logFilename, "at")) == NULL) {
fprintf(stderr, "Cannot open logfile: \"%s\"\n", logFilename);
exit(125);
}
putc('"', f);
if(ComPath) /* path to command.com already known */
fputs(ComPath, f);
putc('"', f);
putc(':', f);
fputs(cmdline, f);
putc('\n', f);
fclose(f);
#endif
p = cmdline; /* start of the command line */
do {
ec = leadOptions(&p, opt_init, NULL);
if(ec == E_NoOption) { /* /C or /K */
assert(p && *p);
if(!isoption(p)) {
error_quoted_c_k();
p = NULL;
break;
}
assert(p[1] && strchr("kKcC", p[1]));
p += 2; /* p := start of command line to execute */
break;
} else if(ec != E_None) {
showhelp = 1;
p = NULL;
break;
}
assert(p && !isoption(p) && !isspace(*p));
if(!*p) {
p = NULL;
break; /* end of line reached */
}
q = unquote(p, h = skip_word(p));
p = h; /* Skip this word */
if(!q) {
error_out_of_memory();
p = NULL;
break;
}
if(!comPath) { /* 1st argument */
grabComFilename(1, (char far*)q);
comPath = 1;
free(q);
} else if(!newTTY) { /* 2nd argument */
#ifdef INCLUDE_CMD_CTTY
newTTY = q;
#else
error_ctty_excluded();
free(q);
#endif
} else {
error_too_many_parameters(q);
showhelp = 1;
free(q);
break;
}
} while(1);
/*
* Now:
* + autoexec: AUTOEXEC.BAT file to be executed if /P switch
* is enabled; if NULL, use default
* + comPath: user-defined PATH to COMMAND.COM; if NULL, use
* the one from the environment
* + newTTY: the name of the device to be CTTY'ed; if NULL,
* no change
* + p: pointer to the command to be executed:
* *p == 'c' or 'C' --> spawn command, then terminate shell
* *p == 'k' or 'K' --> spawn command, then go interactive
* &p[1] --> command line, unless the first character is an
* argument character
*/
/* Now process the options */
#ifdef INCLUDE_CMD_CTTY
if (newTTY) { /* change TTY as early as possible so the caller gets
the messages into the correct channel */
cmd_ctty(newTTY);
free(newTTY);
}
#endif
if(!ComPath) {
/* FreeCom is unable to find itself --> print error message */
/* Emergency error */
puts("You must specify the complete path to " COM_NAME);
puts("as the first argument of COMMAND,");
puts("for instance: C:\\FDOS");
return E_Useage;
}
/* First of all, set up the environment */
env_resizeCtrl |= ENV_USEUMB | ENV_ALLOWMOVE;
if (envSize < 0)
envSize = 32767; /* Numeric overflow (number > 32767 specified) */
else if (envSize < 256)
envSize = 256; /* Minimum size of 256. */
if(envSize > env_resize(0, 0)) /* Test if to enlarge environment */
env_setsize(0, envSize);
/* Set the COMSPEC variable. */
#if 0
if (chgEnv("COMSPEC", ComPath)) error_env_var("COMSPEC");
#else
if (chgEnv("COMSPEC", ComPath)) {
/* Failed to add this variable, the most likely problem should be that
the environment is too small --> it is increased and the
operation is redone */
env_resize(0, strlen(ComPath) + 10);
if (chgEnv("COMSPEC", ComPath))
error_env_var("COMSPEC");
}
#endif
if(internalBufLen)
error_l_notimplemented();
if(inputBufLen)
error_u_notimplemented();
if(tracemode)
showinfo = 0;
if (showhelp)
displayString(TEXT_CMDHELP_COMMAND);
if ((showhelp || exitflag) && canexit)
return E_None;
/* Now the /P option can be processed */
if (!canexit)
{
char *autoexec;
autoexec = user_autoexec? user_autoexec: AUTO_EXEC;
showinfo = 0;
short_version();
/* JP: changed so that if autoexec does not exist, then don't ask
to trace or bypass.
*/
if (exist(autoexec))
{
printf("\nPress F8 for trace mode, or F5 to bypass %s... ", autoexec);
key = WaitForFkeys();
putchar('\n');
if (key == KEY_F8)
{
tracemode = 1;
}
if (key == KEY_F5)
{
printf("Bypassing %s\n", autoexec);
}
else
process_input(1, autoexec);
}
else
{
if(user_autoexec)
printf("%s not found.\n", autoexec);
#ifdef INCLUDE_CMD_DATE
cmd_date(NULL);
#endif
#ifdef INCLUDE_CMD_TIME
cmd_time(NULL);
#endif
}
free(user_autoexec);
}
else
{
assert(user_autoexec == NULL);
}
/* Now the /C or /K option can be processed */
if (p)
{
process_input(1, p);
return spawnAndExit;
}
/* Don't place something here that must be executed after a /K or /C */
if (showinfo)
{
short_version();
putchar('\n');
showcmds(NULL);
putchar('\n');
}
return E_None;
}
int initialize(void)
{
//int rc;
int comPath; /* path to COMMAND.COM (for COMSPEC/reload) */
char *newTTY; /* what to change TTY to */
int showinfo; /* show initial info only if no command line options */
int ec; /* error code */
unsigned offs; /* offset into environment segment */
int cmdlen; /* length of command line */
char *cmdline; /* command line duplicated into heap */
char *p, *h, *q;
#ifdef FEATURE_CALL_LOGGING
#ifndef INCLUDE_CMD_FDDEBUG
FILE *f;
#endif
#endif
/* Set up the host environment of COMMAND.COM */
/* Install the dummy handlers for Criter and ^Break */
initCBreak();
setvect(0x23, cbreak_handler);
setvect(0x24, dummy_criter_handler);
/* DOS shells patch the PPID to the own PID, how stupid this is, however,
because then DOS won't terminate them, e.g. when a Critical Error
occurs that is not detected by COMMAND.COM */
oldPSP = OwnerPSP;
atexit(exitfct);
OwnerPSP = _psp;
dbg_printmem();
#ifdef DEBUG
{ void* p;
if((p = malloc(5*1024)) == 0)
dprintf(("[MEM: Out of memory allocating test block during INIT]"));
else free(p);
}
#endif
#ifdef FEATURE_KERNEL_SWAP_SHELL
if(kswapInit()) { /* re-invoked */
if(kswapLoadStruc()) {
/* OK, on success we need not really keep the shell trick
(pretend we are our own parent), which might cause
problems with beta-software-bugs ;-)
In fact, KSSF will catch up our crashes and re-invoke
FreeCOM, probably with the loss of any internal
settings. */
OwnerPSP = oldPSP;
return E_None;
}
}
#endif
/* Some elder DOSs may not pass an initializied environment segment */
if (env_glbSeg && !isMCB(SEG2MCB(env_glbSeg)))
env_setGlbSeg(0); /* Disable the environment */
/* Now parse the command line parameters passed to COMMAND.COM */
/* Preparations */
newTTY = 0;
comPath = tracemode = 0;
showinfo = 1;
/* Because FreeCom should be executed in a DOS3+ compatible
environment most of the time, it is assumed that its path
can be determined from the environment.
This has the advantage that the string area is accessable
very early in the run.
The name of the current file is string #0. */
if((offs = env_string(0, 0)) != 0) /* OK, environment filled */
grabComFilename(0, (char far *)MK_FP(env_glbSeg, offs));
/* After that argv[0] is no longer used and maybe zapped.
This also will help, as most programs altering the environment
segment externally don't expect a string area. */
env_nullStrings(0);
/* Aquire the command line, there are three possible sources:
1) DOS command line @PSP:0x80 as pascal string,
2) extended DOS command line environment variable CMDLINE,
if peekb(PSP, 0x80) == 127,&
3) MKS command line @ENV:2, if peekb(ENV, 0) == '~'
&& peekb(ENV, 1) == '='
Currently implemented is version #1 only
*/
cmdlen = peekb(_psp, 0x80);
if(cmdlen < 0 || cmdlen > 126) {
error_corrupt_command_line();
cmdlen = 0;
}
/* duplicate the command line into the local address space */
if((cmdline = malloc(cmdlen + 1)) == 0) {
error_out_of_memory(); /* Cannot recover from this problem */
return E_NoMem;
}
_fmemcpy((char far*)cmdline, MK_FP(_psp, 0x81), cmdlen);
cmdline[cmdlen] = '\0';
#ifdef FEATURE_CALL_LOGGING
#ifndef INCLUDE_CMD_FDDEBUG
if((f = fopen(logFilename, "at")) == 0) {
fprintf(stderr, "Cannot open logfile: \"%s\"\n", logFilename);
} else {
putc('"', f);
if(ComPath) /* path to command.com already known */
fputs(ComPath, f);
putc('"', f);
putc(':', f);
fputs(cmdline, f);
putc('\n', f);
fclose(f);
}
#else
cmd_fddebug(logFilename);
dbg_outc('"');
dbg_outs(ComPath);
dbg_outc('"');
dbg_outc(':');
dbg_outsn(cmdline);
#endif
#endif
canexit = 1;
p = cmdline; /* start of the command line */
do {
ec = leadOptions(&p, opt_init, 0);
if(ec == E_NoOption) { /* /C or /K */
assert(p && *p);
if(!isoption(p)) {
error_quoted_c_k();
p = 0;
break;
}
assert(p[1] && strchr("kKcC", p[1]));
p += 2; /* p := start of command line to execute */
break;
} else if(ec != E_None) {
showhelp = 1;
p = 0;
break;
}
assert(p && !isoption(p) && !isspace(*p));
if(!*p) {
p = 0;
break; /* end of line reached */
}
q = unquote(p, h = skip_word(p));
p = h; /* Skip this word */
if(!q) {
error_out_of_memory();
p = 0;
break;
}
if(!comPath) { /* 1st argument */
grabComFilename(1, (char far*)q);
comPath = 1;
free(q);
} else if(!newTTY) { /* 2nd argument */
#ifdef INCLUDE_CMD_CTTY
newTTY = q;
#else
error_ctty_excluded();
free(q);
#endif
} else {
error_too_many_parameters(q);
showhelp = 1;
free(q);
break;
}
} while(1);
/*
* Now:
* + autoexec: AUTOEXEC.BAT file to be executed if /P switch
* is enabled; if NULL, use default
* + comPath: user-defined PATH to COMMAND.COM; if NULL, use
* the one from the environment
* + newTTY: the name of the device to be CTTY'ed; if NULL,
* no change
* + p: pointer to the command to be executed:
* *p == 'c' or 'C' --> spawn command, then terminate shell
* *p == 'k' or 'K' --> spawn command, then go interactive
* &p[1] --> command line, unless the first character is an
* argument character
*/
/* Now process the options */
#ifdef INCLUDE_CMD_CTTY
if (newTTY) { /* change TTY as early as possible so the caller gets
the messages into the correct channel */
cmd_ctty(newTTY);
free(newTTY);
}
#endif
if(!ComPath) {
/* FreeCom is unable to find itself --> print error message */
/* Emergency error */
#undef TEXT_MSG_FREECOM_NOT_FOUND
puts(TEXT_MSG_FREECOM_NOT_FOUND);
return E_Useage;
}
/* First of all, set up the environment */
/* If a new valid size is specified, use that */
env_resizeCtrl |= ENV_USEUMB | ENV_ALLOWMOVE;
if(newEnvSize > 16 && newEnvSize < 32767)
env_setsize(0, newEnvSize);
/* Otherwise the path is placed into the environment */
/* Set the COMSPEC variable. */
if(chgEnv("COMSPEC", ComPath)) { /* keep it silent */
/* Failed to add this variable, the most likely problem should be that
the environment is too small --> it is increased and the
operation is redone */
env_resize(0, strlen(ComPath) + 10);
if(chgEnv("COMSPEC", ComPath))
chgEnv("COMSPEC", NULL); /* Cannot set -> zap an old one */
}
inInit = 0;
/* Install INT 24 Critical error handler */
/* Needs the ComPath variable, eventually */
if(!kswapContext) {
/* Load the module/context into memory */
if((kswapContext = modContext()) == 0) {
error_loading_context();
return E_NoMem;
}
#ifdef FEATURE_KERNEL_SWAP_SHELL
if(swapOnExec != ERROR)
kswapRegister(kswapContext);
#endif
}
ctxtCreate();
/* re-use the already loaded Module */
setvect(0x24, (void interrupt(*)())
MK_FP(FP_SEG(kswapContext->cbreak_hdlr), kswapContext->ofs_criter));
if(internalBufLen)
error_l_notimplemented();
if(inputBufLen)
error_u_notimplemented();
if(tracemode)
showinfo = 0;
if (showhelp)
displayString(TEXT_CMDHELP_COMMAND);
if ((showhelp || exitflag) && canexit)
return E_None;
/* Now the /P option can be processed */
if(!canexit) {
char *autoexec;
autoexec = user_autoexec? user_autoexec: AUTO_EXEC;
showinfo = 0;
short_version();
if(skipAUTOEXEC) { /* /D option */
showinfo = 0;
displayString(TEXT_MSG_INIT_BYPASSING_AUTOEXEC, autoexec);
} else {
if(exist(autoexec)) {
#ifdef FEATURE_BOOT_KEYS
struct REGPACK r;
int key;
r.r_ax = 0x3000; /* Get DOS version & OEM ID */
intr(0x21, &r);
if(!tracemode /* /Y --> F8 on CONFIG.SYS */
|| ((r.r_bx & 0xff00) == 0xfd00 /* FreeDOS >= build 2025 */
&& !(r.r_cx > 0x101 || (r.r_bx & 0xff) > 24))) {
displayString(TEXT_MSG_INIT_BYPASS_AUTOEXEC, autoexec);
key = cgetchar_timed(3);
putchar('\n');
} else key = 0;
if(key == KEY_F8)
tracemode = 1;
if(key == KEY_F5)
displayString(TEXT_MSG_INIT_BYPASSING_AUTOEXEC, autoexec);
else
#endif
process_input(1, autoexec);
} else {
if(user_autoexec)
error_sfile_not_found(user_autoexec);
#ifdef INCLUDE_CMD_DATE
cmd_date(0);
#endif
#ifdef INCLUDE_CMD_TIME
cmd_time(0);
#endif
}
}
free(user_autoexec);
} else {
assert(user_autoexec == 0);
}
/* Now the /C or /K option can be processed */
if (p)
{
process_input(1, p);
return spawnAndExit;
}
/* Don't place something here that must be executed after a /K or /C */
if (showinfo)
{
short_version();
#ifndef DEBUG
putchar('\n');
showcmds(0);
putchar('\n');
#endif
}
return E_None;
}
