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REXXCALC
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REXXCALC.C
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C/C++ Source or Header
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1994-11-17
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69KB
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1,285 lines
/***************_******************************************************/
/* */
/* REXXCALC - A simple PM based pocket calculator */
/* */
/*********************************************************************/
/* Standard C libraries */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <process.h>
/* Include specific parts of the OS/2 and presentation manager */
/* definitions */
#define INCL_DOSSEMAPHORES
#define INCL_DOSPROCESS
#define INCL_WIN
#include "os2.h"
#define INCL_REXXSAA
#include <rexxsaa.h>
#include "pmrexxio.h"
/* Include the constants file created by the Dialog Box Editor. */
/* This include file defines symbols for all elements of the */
/* calculator dialog. */
#include "rexxcalc.h"
/* Declare some typedefs */
typedef struct { /* Instorage descriptor */
RXSTRING source; /* Program source */
RXSTRING image; /* tokenized image */
} INSTORE;
typedef INSTORE *PINSTORE; /* pointer to instore desc. */
/* Declare prototypes for all subroutines. */
INT main(void); /* Main PM calculator program */
/* Calculator dialog */
MRESULT EXPENTRY Calculator(HWND, ULONG, MPARAM, MPARAM);
/* Button subclass winproc */
MRESULT EXPENTRY Button(HWND, ULONG, MPARAM, MPARAM);
/* CalcForm external function */
LONG EXPENTRY CalcForm(PSZ, LONG, PRXSTRING, PSZ, PRXSTRING);
/* CalcPrecision ext function */
LONG EXPENTRY CalcPrecision(PSZ, LONG, PRXSTRING, PSZ, PRXSTRING);
/* subcommand handler */
APIRET EXPENTRY CalcCommand(PRXSTRING, PUSHORT, PRXSTRING);
LONG EXPENTRY init_routine(LONG, LONG, PUCHAR);
void CalcThread(void); /* thread for calculations */
void EditThread(void); /* thread for editting */
void ProcessArithmetic(LONG); /* Arithmetic processor */
void AddDigit(INT); /* add digit to display */
void SetDisplay(PRXSTRING); /* set new display */
/* process a programmed key */
void ProcessProgram(ULONG, PRXSTRING, PRXSTRING, PRXSTRING);
void ProcessMacro(ULONG, PRXSTRING, PRXSTRING, PRXSTRING, ULONG);
INT Datatype(PSZ, PSZ); /* validate a whole number */
/* read macro source */
void ReadSourceFile(PSZ, PINSTORE);
void FreeSourceFile(PINSTORE); /* free macro source */
INT SetRexxVariable(PSZ, PSZ); /* set a Rexx variable */
/* Define some constants for the calculator dialog */
#define DISPLAY_WIDTH 20 /* width of display area */
#define MAX_DIGITS 18 /* maximum digits in display */
#define SCIENTIFIC 0 /* Scientific floating point */
#define ENGINEERING 1 /* Engineering floating point */
#define NUMBER_MEMORIES 50 /* size of memory registers */
#define STACKSIZE 8192 /* thread execution stack */
#define YES 1 /* YES and NO constants (I */
#define NO 0 /* prefer these over TRUE and */
/* FALSE */
#define WM_EDIT_DONE WM_USER+1 /* edit completion user msg */
#define WM_MEMORY_DONE WM_USER+2 /* calc completion user msg */
#define WM_OPERATOR_DONE WM_USER+3 /* calc completion user msg */
#define WM_PROGRAM_DONE WM_USER+4 /* calc completion user msg */
#define MACRO_COUNT (sizeof(operator_names)/sizeof(PSZ))
/* Global data used for the dialog */
HAB hab; /* Anchor block handle */
HWND hwndCalc; /* Handle for calculator */
/* dialog (created using */
/* the dialog editor) */
/* Global data used for the calculator */
/* memory registers */
PSZ memory_bank[NUMBER_MEMORIES + 1];
UCHAR membuff[3]; /* memory function selector */
UCHAR accbuff[DISPLAY_WIDTH + 1]; /* accumulator buffer */
UCHAR dispbuff[DISPLAY_WIDTH + 1]; /* display buffer */
UCHAR precision[MAX_DIGITS + 1]; /* current precision */
INT form; /* engineering/scientific flag*/
RXSTRING accumulator; /* current register value */
RXSTRING display; /* current display */
INT oldaction; /* pending key action */
INT digits; /* digits in display */
INT hadperiod; /* period in number */
INT hadexponent; /* exponent in number */
INT memory_function; /* memory function flag */
INT memory_action; /* save memory action */
/* saved window procedures */
PFNWP oldwindowproc[MAX_MACRO - MIN_MACRO + 1];
INT calcdisabled; /* calc interlock flag */
TID editthreadid; /* TID of editor thread */
TID calcthreadid; /* TID of calculator thread */
PID process; /* PID of our process */
HEV calcsem; /* calculation semaphore */
INT editted_program; /* macro editted */
RXSTRING global_args[2]; /* passed argument strings */
INT global_argc; /* argument count */
PRXSTRING global_result; /* returned result string */
UINT global_completion; /* completion message */
UINT global_macro_name; /* macro to invoke */
HWND global_handle; /* handle for completion msg */
HWND hwndIOWindow; /* handle of I/O window */
HWND hwndIOClient; /* handle of I/O client area */
BOOL tracing = FALSE; /* macro trace flag */
/* table of external function */
/* macro names */
PUCHAR operator_names[] = {
"MULTIPLY.CAL", /* * key */
"MINUS.CAL", /* - key */
"PLUS.CAL", /* + key */
"DIVIDE.CAL", /* / key */
"INTEGER.CAL", /* % key */
"REMAIND.CAL", /* // key */
"POWER.CAL", /* ** key */
"PROGRAM1.CAL", /* first program key */
"PROGRAM2.CAL", /* second program key */
"PROGRAM3.CAL", /* third program key */
"PROGRAM4.CAL", /* fourth program key */
"PROGRAM5.CAL", /* fifth program key */
"PROGRAM6.CAL", /* sixth program key */
"PROGRAM7.CAL", /* seventh program key */
"PROGRAM8.CAL", /* eighth program key */
"MEMPLUS.CAL", /* memory plus key */
"MEMMINUS.CAL", /* memory minus key */
"MEMSTORE.CAL", /* memory recall key */
"MEMRECAL.CAL", /* memory store key */
"MEMCLEAR.CAL", /* memory clear key */
"DATATYPE.CAL"}; /* data validation program */
/* loaded program sources */
INSTORE operator_programs[MACRO_COUNT];
/* exit_list is a list of the system exits PMREXX register's with REXX */
static RXSYSEXIT exit_list[] = {
{ PMRXIO_EXIT, RXSIO },
{ "PMREXXINIT", RXINI },
{ NULL, RXENDLST }};
/*********************************************************************/
/* main() - the main calculator program entry point */
/*********************************************************************/
INT main()
{
HMQ hmq; /* Message queue handle */
QMSG qmsg; /* Receive PM queue message */
PTIB TI; /* Thread information block */
PPIB PI; /* process information block */
DosGetInfoBlocks(&TI,&PI); /* Get the thread information */
process = PI->pib_ulpid; /* set the process id */
/* startup PM usage */
hab = WinInitialize(0); /* Get the anchor block handle*/
hmq = WinCreateMsgQueue(hab, 0); /* Create the message queue */
/* create our I/O window */
hwndIOWindow = RexxCreateIOWindow(HWND_DESKTOP, &hwndIOClient);
/* register I/O handler */
RexxRegisterExitExe("PMREXXINIT", (PFN)init_routine, NULL);
/* register our window class */
WinRegisterClass(hab, "RexxCalc", Calculator, 0l, 0);
/* Load the calculator dialog. The dialog definitions are in */
/* rexxcalc.rc */
hwndCalc = WinLoadDlg(HWND_DESKTOP, HWND_DESKTOP, NULL,
(HMODULE)NULL,
REXXCALC, /* Dialog ID */
NULL);
WinSendMsg(hwndCalc, WM_SETICON, /* Set program icon */
(MPARAM)WinLoadPointer(HWND_DESKTOP, (HMODULE)NULL, REXXCALC),
NULL);
/* set the window focus */
WinSetFocus(HWND_DESKTOP,
WinWindowFromID(hwndCalc, (USHORT)FID_CLIENT));
/* Process the standard Presentation Manager message loop until */
/* we are told to terminate */
/* While more messages */
while (WinGetMsg(hab, &qmsg, 0, 0, 0))
WinDispatchMsg(hab, &qmsg); /* dispatch application */
/* message handler */
/* The close option has been selected so we need to clean up */
/* our context. */
RexxDestroyIOWindow(hwndIOWindow); /* Destroy the I/O window */
/* drop exit handler */
RexxDeregisterExit("PMREXXINIT", NULL);
WinDestroyWindow(hwndCalc); /* Destroy the dialog window */
WinDestroyMsgQueue(hmq); /* Destroy the message queue */
WinTerminate(hab); /* Terminate PM usage */
return (0); /* Indicate successful */
/* completion */
}
/*********************************************************************/
/* */
/* Calculator() - the PM WinProc for handling the calculator dialog. */
/* The dialog itself has been created using the dialog box editor. */
/* This seperates the actual form of the calculator from the program */
/* source. */
/* */
/*********************************************************************/
MRESULT EXPENTRY Calculator(
HWND hwnd, /* window handle */
ULONG msg, /* dispatched message id */
MPARAM mp1, /* first message parameter */
MPARAM mp2 ) /* second message parameter */
{
ULONG action; /* Action to process */
INT i; /* loop index */
RXSTRING memory_setting; /* memory number */
switch (msg) { /* switch based on the message*/
/* received */
/* The initialization message has been received. We do some */
/* additional fixup of the dialog to make it look a little */
/* nicer. */
case WM_INITDLG:
global_handle = hwnd; /* remember handle for thread */
/* register our external */
/* functions */
RexxRegisterFunctionExe("CalcPrecision", (PFN)CalcPrecision);
RexxRegisterFunctionExe("CalcForm", (PFN)CalcForm);
/* register subcommand handler*/
RexxRegisterSubcomExe("Calculator", (PFN)CalcCommand, NULL);
/* read in the programs */
for (i = 0; i < MACRO_COUNT; i++)
ReadSourceFile(operator_names[i],
&operator_programs[i]);
/* initialize the memory bank */
for (i = 1; i <= NUMBER_MEMORIES; i++)
memory_bank[i] = NULL; /* all null pointers */
/* subclass programmable */
/* buttons so we can trap */
/* BUTTON2 events */
for (i = MIN_MACRO; i <= MAX_MACRO; i++)
oldwindowproc[i - MIN_MACRO] =
WinSubclassWindow(WinWindowFromID(hwnd, i),
(PFNWP)Button);
/* initialize accumulator */
MAKERXSTRING(accumulator, accbuff, 1);
strcpy(accbuff, "0"); /* fill in a zero */
digits = 0; /* no digits in number */
hadperiod = NO; /* no period yet */
hadexponent = NO; /* no exponential yet */
oldaction = 0; /* no pending operations */
memory_function = NO; /* not waiting for mem number */
strcpy(precision, "9"); /* set default precision */
form = SCIENTIFIC; /* set default form */
calcdisabled = NO; /* functions enabled */
SetDisplay(&accumulator); /* set initial display value */
/* update the calculator */
/* display */
WinSetWindowText(WinWindowFromID(hwnd, DISPLAY),
display.strptr);
calcsem = 0; /* zero semaphore handle */
/* create a semaphore */
DosCreateEventSem(NULL, &calcsem, FALSE, FALSE);
/* create calculation thread */
DosCreateThread(&calcthreadid, (PFNTHREAD)CalcThread,
(ULONG)0, (ULONG)0, STACKSIZE);
return FALSE; /* initialization complete */
/* We have finished editting a key macro. Clean up the thread */
/* and reenable the main calculator. */
case WM_EDIT_DONE:
calcdisabled = NO; /* reenable the calculator */
return FALSE; /* resume normal operations */
case WM_MEMORY_DONE: /* memory command completed */
calcdisabled = NO; /* reenable the calculator */
/* display */
WinSetWindowText(WinWindowFromID(hwnd, DISPLAY),
display.strptr);
return FALSE; /* resume normal operations */
case WM_OPERATOR_DONE: /* math operator completed */
calcdisabled = NO; /* reenable the calculator */
/* function return an error? */
if (!strcmp(accumulator.strptr,"Error"))
oldaction = 0; /* cancel next on error */
/* redisplay the accumlator */
SetDisplay(&accumulator);
/* display */
WinSetWindowText(WinWindowFromID(hwnd, DISPLAY),
display.strptr);
/* may need to process a */
/* a program key now */
switch (oldaction) { /* now process then new key */
/* process function keys */
/* immediately */
case BUTTON_PROGRAM1: /* program key one */
case BUTTON_PROGRAM2: /* program key two */
case BUTTON_PROGRAM3: /* program key three */
case BUTTON_PROGRAM4: /* program key four */
case BUTTON_PROGRAM5: /* program key five */
case BUTTON_PROGRAM6: /* program key six */
case BUTTON_PROGRAM7: /* program key seven */
case BUTTON_PROGRAM8: /* program key eight */
oldaction = 0; /* cancel next action */
/* call the appropriate */
/* Rexx operand processor */
/* Process the macro */
ProcessMacro(oldaction - MIN_MACRO, &accumulator,
&display, &accumulator, WM_PROGRAM_DONE);
break;
}
return FALSE; /* resume normal operations */
case WM_PROGRAM_DONE: /* program key completed */
calcdisabled = NO; /* reenable the calculator */
/* redisplay the accumlator */
SetDisplay(&accumulator);
/* display */
WinSetWindowText(WinWindowFromID(hwnd, DISPLAY),
display.strptr);
return FALSE; /* resume normal operations */
/* We are going away, time to post a quit message to the */
/* message loop. */
case WM_CLOSE:
if (calcdisabled) /* currently editting? */
/* suspend the thread */
DosSuspendThread(editthreadid);
/* free source programs */
for (i = 0; i < MACRO_COUNT; i++)
FreeSourceFile(&operator_programs[i]);
/* clear the memory bank */
for (i = 1; i <= NUMBER_MEMORIES; i++)
if (memory_bank[i]) /* if has a value */
free(memory_bank[i]); /* release it */
/* Deregister our defined */
/* functions */
RexxDeregisterFunction("CalcPrecision");
RexxDeregisterFunction("CalcForm");
/* Deregister command handler */
RexxDeregisterSubcom("Calculator", NULL);
/* Standard Close processing */
WinPostMsg(hwnd, WM_QUIT, 0L, 0L);
return FALSE; /* Exit now */
/* We've received a WM_CONTROL message. This was */
/* generated by the "Form" check blox. */
case WM_CONTROL: /* change current form */
action = SHORT1FROMMP(mp1); /* Extract message sub-type */
switch (action) { /* process the control */
case BUTTON_FORM: /* form switch button */
if (form == SCIENTIFIC) { /* current scientific? */
form = ENGINEERING; /* make it engineering */
/* update label */
WinSetWindowText(WinWindowFromID(hwnd, BUTTON_FORM),
"Engineering");
}
else {
form = SCIENTIFIC; /* otherwise scientfic */
WinSetWindowText(WinWindowFromID(hwnd, BUTTON_FORM),
"Scientific");
}
return FALSE; /* all done */
case BUTTON_TRACE: /* turn on trace */
tracing = ~tracing; /* flip the flag */
if (tracing) { /* trace on? */
WinSetWindowText(WinWindowFromID(hwnd, BUTTON_TRACE),
"Trace On");
/* turn on the trace */
RexxSetTrace(process, calcthreadid);
}
else { /* turn off the trace */
WinSetWindowText(WinWindowFromID(hwnd, BUTTON_TRACE),
"Trace Off");
RexxResetTrace(process, calcthreadid);
}
default: /* Unknown, can't handle this */
return FALSE;
}
/* We've received a WM_COMMAND message. WM_COMMAND messages */
/* are generated by "pressing" buttons on the calculator. The */
/* additional parameters in the received message identify the */
/* button that was pressed */
case WM_COMMAND:
if (calcdisabled) { /* editting a function? */
/* give an error beep */
WinAlarm(HWND_DESKTOP, WA_ERROR);
return FALSE; /* done with message */
}
action = SHORT1FROMMP(mp1); /* Extract message sub-type */
if (memory_function) { /* waiting for memory input? */
switch(action) { /* process based on type */
case BUTTON_0: /* Numeric keys are the only */
case BUTTON_1: /* things allowed, except for */
case BUTTON_2: /* the clear key */
case BUTTON_3:
case BUTTON_4:
case BUTTON_5:
case BUTTON_6:
case BUTTON_7:
case BUTTON_8:
case BUTTON_9:
/* store character */
membuff[sizeof(membuff) - (memory_function + 1)] =
(UCHAR)((action - BUTTON_0) + '0');
/* got last digit? */
if (!(--memory_function)) {
/* get memory number in an */
/* RXSTRING */
MAKERXSTRING(memory_setting, membuff,
sizeof(membuff) - 1);
/* process the memory key */
switch (memory_action) {
/* memory recall */
case BUTTON_MEMORY_RECALL:
case BUTTON_MEMORY_CLEAR:
/* call the macro */
ProcessMacro(memory_action - MIN_MACRO,
&memory_setting, NULL,
NULL, WM_MEMORY_DONE);
break; /* finished */
/* memory operation on display*/
case BUTTON_MEMORY_STORE:
case BUTTON_MEMORY_PLUS:
case BUTTON_MEMORY_MINUS:
/* call the macro */
ProcessMacro(memory_action - MIN_MACRO,
&memory_setting, &accumulator,
NULL, WM_MEMORY_DONE);
break; /* finished */
}
}
return FALSE; /* done with message */
case BUTTON_CLEAR: /* Clear key */
memory_function = 0; /* disable memory function */
return FALSE; /* done with message */
default: /* disabled key */
/* give an error beep */
WinAlarm(HWND_DESKTOP, WA_ERROR);
return FALSE; /* done with message */
}
}
switch (action) {
/* memory operation on display*/
case BUTTON_MEMORY_STORE: /* store to memory */
case BUTTON_MEMORY_PLUS: /* add to memory */
case BUTTON_MEMORY_MINUS: /* subtract from memory */
case BUTTON_MEMORY_RECALL: /* recall memory to display */
case BUTTON_MEMORY_CLEAR: /* clear a memory */
/* copy display into accum */
strcpy(accumulator.strptr, display.strptr);
/* copy the length also */
accumulator.strlength = display.strlength;
digits = 0; /* no digits in display */
memory_action = action; /* remember the key */
memory_function = 2; /* need two digits from pad */
return FALSE; /* wait for key info */
case BUTTON_CLEAR: /* Clear key */
/* initialize accumulator */
MAKERXSTRING(accumulator, accbuff, 1);
strcpy(accbuff, "0"); /* fill in a zero */
/* initialize the display */
MAKERXSTRING(display, dispbuff, 1);
strcpy(dispbuff, "0"); /* fill in a zero display */
digits = 0; /* no digits yet */
hadperiod = NO; /* turn off number processing */
hadexponent = NO; /* flags. */
oldaction = 0; /* and any pending operations */
/* update the calculator */
/* display */
WinSetWindowText(WinWindowFromID(hwnd, DISPLAY),
display.strptr);
return FALSE; /* All done */
case BUTTON_DIGITS: /* set new digits */
/* not a whole number? */
if (!Datatype(display.strptr, "Whole"))
/* give an error beep */
WinAlarm(HWND_DESKTOP, WA_ERROR);
else { /* process the number */
/* copy the number */
strcpy(precision, display.strptr);
/* redisplay the accumlator */
SetDisplay(&accumulator);
/* display */
WinSetWindowText(WinWindowFromID(hwnd, DISPLAY),
display.strptr);
}
return FALSE; /* All done */
case BUTTON_0: /* Numeric keys */
case BUTTON_1:
case BUTTON_2:
case BUTTON_3:
case BUTTON_4:
case BUTTON_5:
case BUTTON_6:
case BUTTON_7:
case BUTTON_8:
case BUTTON_9:
case BUTTON_PERIOD: /* decimal point */
case BUTTON_EXPONENT: /* exponent value */
case BUTTON_SIGN: /* sign change */
/* Add a digit to display */
AddDigit(action);
/* update the accumulator */
/* display */
WinSetWindowText(WinWindowFromID(hwnd, DISPLAY),
display.strptr);
return FALSE; /* All done */
/* The arithmetic operation keys all have a deferred */
/* execution. When one of these is pressed, the previous*/
/* arithmetic operation is processed using the */
/* accumulator and the current display. The new operator*/
/* is saved for later execution. If no operator exists, */
/* then the current display is moved to the accumulator */
/* and no arithmetic is done */
case BUTTON_MULTIPLY: /* Multiply key */
case BUTTON_DIVIDE: /* Division key */
case BUTTON_PLUS: /* Addition key */
case BUTTON_MINUS: /* Subtraction key */
case BUTTON_IDIV: /* integer division */
case BUTTON_REMAINDER: /* remainder division */
case BUTTON_POWER: /* raise a number to power */
case BUTTON_ENTER: /* "Total" key */
case BUTTON_PROGRAM1: /* programmed Rexx function */
case BUTTON_PROGRAM2: /* programmed Rexx function */
case BUTTON_PROGRAM3: /* programmed Rexx function */
case BUTTON_PROGRAM4: /* programmed Rexx function */
case BUTTON_PROGRAM5: /* programmed Rexx function */
case BUTTON_PROGRAM6: /* programmed Rexx function */
case BUTTON_PROGRAM7: /* programmed Rexx function */
case BUTTON_PROGRAM8: /* programmed Rexx function */
/* Process pending operations */
global_handle = hwnd; /* save window handle */
ProcessArithmetic(action);
return FALSE; /* All done */
default: /* Unknown, can't handle this */
return FALSE;
}
case WM_ERASEBACKGROUND: /* disable background erase */
return MRFROMLONG(TRUE); /* don't allow this */
/* Message not handled by us. PM gives us first chance at all */
/* messages. Those we don't want to process we pass on to the */
/* default dialog procedure. */
default:
return WinDefWindowProc(hwnd, msg, mp1, mp2);
}
return FALSE; /* Should never reach here */
}
/*********************************************************************/
/* */
/* Button() - the PM WinProc for handling actions on */
/* programmable buttons. This only intercepts the WM_BUTTON2DOWN */
/* events for programmable keys. */
/* */
/*********************************************************************/
MRESULT EXPENTRY Button(
HWND hwnd, /* window handle */
ULONG msg, /* dispatched message id */
MPARAM mp1, /* first message parameter */
MPARAM mp2 ) /* second message parameter */
{
LONG id; /* id of pressed button */
/* get the button id */
id = WinQueryWindowUShort(hwnd, QWS_ID);
switch(msg) { /* process different messages */
/* Button 2 pressed on a */
case WM_BUTTON2DOWN: /* programmed key. */
if (calcdisabled) { /* already editting? */
/* give an error beep */
WinAlarm(HWND_DESKTOP, WA_ERROR);
return FALSE; /* done with message */
}
/* save the program */
editted_program = id - MIN_MACRO;
calcdisabled = YES; /* disable key functions */
/* spin off the thread */
/* spin off the thread */
DosCreateThread(&editthreadid, (PFNTHREAD)EditThread,
(ULONG)0, (ULONG)0, STACKSIZE);
return FALSE; /* wait for completion msg */
/* Pass all other events on to the main handlers. */
default:
return (*oldwindowproc[id - MIN_MACRO])(hwnd, msg, mp1, mp2);
}
}
/*********************************************************************/
/* */
/* AddDigit(digit) - add a digit to the calculator display */
/* */
/*********************************************************************/
void AddDigit(
INT digit ) /* new digit to add */
{
if (digit == BUTTON_SIGN) { /* negate number */
if (!digits || /* first press? */
/* sign after exponent? */
display.strptr[digits-1] == 'E') {
display.strptr[digits++] = '-'; /* add the minus sign */
display.strptr[digits] = '\0'; /* add new string terminator */
display.strlength = digits; /* keep length in check */
}
else /* invalid sign press */
WinAlarm(HWND_DESKTOP, WA_ERROR);/* beep at the user */
}
else if (digit == BUTTON_PERIOD) { /* decimal point */
if (hadperiod || /* have one already? */
hadexponent || /* or an exponent? */
digits >= MAX_DIGITS) /* or too big */
WinAlarm(HWND_DESKTOP, WA_ERROR);/* beep at the user */
else { /* add a decimal point */
if (!digits) /* have digits already? */
display.strptr[digits++] = '0';/* no, add leading zero */
display.strptr[digits++] = '.'; /* add the decimal point */
display.strptr[digits] = '\0'; /* add new string terminator */
display.strlength = digits; /* keep length in check */
hadperiod = YES; /* remember this */
}
}
else if (digit == BUTTON_EXPONENT) { /* use scientific */
if (hadexponent || /* have one already? */
digits >= MAX_DIGITS) /* or too big */
WinAlarm(HWND_DESKTOP, WA_ERROR);/* beep at the user */
else {
if (!digits) /* have digits already? */
display.strptr[digits++] = '0';/* no, add leading zero */
display.strptr[digits++] = 'E'; /* add the exponent */
display.strptr[digits] = '\0'; /* add new string terminator */
display.strlength = digits; /* keep length in check */
hadexponent = YES; /* remember this */
}
}
else { /* real digit */
digit -= BUTTON_0; /* make base zero */
digit += (INT)'0'; /* convert to character value */
if (digits >= MAX_DIGITS) /* or too big */
WinAlarm(HWND_DESKTOP, WA_ERROR);/* beep at the user */
else { /* if small enough */
/* add new digit to display */
display.strptr[digits++] = (UCHAR)digit;
display.strptr[digits] = '\0'; /* add new string terminator */
display.strlength = digits; /* keep length in check */
}
}
}
/*********************************************************************/
/* */
/* SetDisplay(newdisplay) - Set the current display string to a new */
/* display value. */
/* */
/*********************************************************************/
void SetDisplay(
PRXSTRING newdisplay ) /* new number to display */
{
/* copy the new value */
memcpy(dispbuff, newdisplay->strptr, newdisplay->strlength);
display.strptr = dispbuff; /* point at current buffer */
/* update the length */
display.strlength = newdisplay->strlength;
dispbuff[display.strlength] = '\0'; /* make into ASCII-Z */
digits = 0; /* no digits in number */
hadperiod = NO; /* no period yet */
hadexponent = NO; /* no exponential yet */
}
/*********************************************************************/
/* */
/* ProcessArithmetic(newaction) - Process any pending arithmetic */
/* operation updating the accumulator and the pending */
/* operation. */
/* */
/*********************************************************************/
void ProcessArithmetic(
LONG newaction ) /* new operator key pressed */
{
LONG action; /* action to take */
action = oldaction; /* remember old actiion */
switch(oldaction) { /* process prior action key */
case BUTTON_MULTIPLY: /* multiplication */
case BUTTON_DIVIDE: /* division */
case BUTTON_PLUS: /* addition */
case BUTTON_MINUS: /* subtraction */
case BUTTON_IDIV: /* integer division */
case BUTTON_REMAINDER: /* remainder division */
case BUTTON_POWER: /* raise a number to power */
oldaction = newaction; /* remember the new action */
/* call the appropriate */
/* Rexx operand processor */
ProcessMacro(action - MIN_MACRO, &accumulator, &display,
&accumulator, WM_OPERATOR_DONE);
break;
default:
/* copy display into accum */
strcpy(accumulator.strptr, display.strptr);
/* copy the length also */
accumulator.strlength = display.strlength;
digits = 0; /* no digits in display */
switch (newaction) { /* now process the new key */
/* process function keys */
/* immediately */
case BUTTON_PROGRAM1: /* program key one */
case BUTTON_PROGRAM2: /* program key two */
case BUTTON_PROGRAM3: /* program key three */
case BUTTON_PROGRAM4: /* program key four */
case BUTTON_PROGRAM5: /* program key five */
case BUTTON_PROGRAM6: /* program key six */
case BUTTON_PROGRAM7: /* program key seven */
case BUTTON_PROGRAM8: /* program key eight */
oldaction = 0; /* cancel next action */
/* call the appropriate */
/* Rexx operand processor */
SetDisplay(&accumulator); /* update display */
ProcessMacro(newaction - MIN_MACRO, &accumulator, &display,
&accumulator, WM_PROGRAM_DONE);
break;
default: /* all other operations */
oldaction = newaction; /* remember the new action */
}
break; /* no more needed */
}
}
/*********************************************************************/
/* */
/* ProcessProgram() - Process a call to a programed Rexx function. */
/* The program is passed both the accumulator */
/* and the current display as strings. */
/* */
/*********************************************************************/
void ProcessProgram(
ULONG macro_name, /* macro to invoke */
PRXSTRING left, /* left operand */
PRXSTRING right, /* right operand */
PRXSTRING result ) /* result location */
{
RXSTRING args[2]; /* passed argument strings */
INT argc; /* argument count */
INT rc; /* Rexx return code */
SHORT return_code; /* function return code */
args[0] = *left; /* set first argument */
if (right) { /* two arguments provided? */
args[1] = *right; /* copy RXSTRING */
argc = 2; /* two arguments */
}
else
argc = 1; /* only one argument */
rc = RexxStart(argc, /* two arguments */
args, /* array of arguments */
/* name of the macro */
operator_names[macro_name],
/* instorage program */
(PRXSTRING)&operator_programs[macro_name],
"Calculator", /* default command address */
RXFUNCTION, /* calling this a function */
NULL,
&return_code, /* numeric value of return str*/
result); /* returned string result */
if (result) /* if result requested */
/* make into an ASCII-Z string*/
result->strptr[result->strlength] = '\0';
}
/*********************************************************************/
/* */
/* ProcessMacro() - Process a call to a programed Rexx function. */
/* The program is passed both the accumulator */
/* and the current display as strings and */
/* executed on a separate thread. */
/* */
/*********************************************************************/
void ProcessMacro(
ULONG macro_name, /* macro to invoke */
PRXSTRING left, /* left operand */
PRXSTRING right, /* right operand */
PRXSTRING result, /* result location */
ULONG completion ) /* completion message */
{
global_args[0] = *left; /* set first argument */
if (right) { /* two arguments provided? */
global_args[1] = *right; /* copy RXSTRING */
global_argc = 2; /* two arguments */
}
else
global_argc = 1; /* only one argument */
global_macro_name = macro_name; /* save macro name */
global_result = result; /* save result pointer */
global_completion = completion; /* save completion message */
DosPostEventSem(calcsem); /* kick off the thread */
}
/*********************************************************************/
/* */
/* Datatype() - Call Rexx to validate a character string */
/* */
/*********************************************************************/
INT Datatype(
PSZ string, /* string to validate */
PSZ operation ) /* datatype operation */
{
RXSTRING args[2]; /* passed argument strings */
RXSTRING result; /* returned result string */
UCHAR resbuf[10]; /* result buffer */
/* set first argment */
MAKERXSTRING(args[0], string, strlen(string));
/* and second argument */
MAKERXSTRING(args[1], operation, strlen(operation));
result.strptr = resbuf; /* point to return point */
result.strlength = sizeof(resbuf); /* set maximum size */
/* invoke the Rexx program */
/* DATATYPE is last one in */
/* the list */
ProcessProgram(MACRO_COUNT - 1, &args[0], &args[1], &result);
if (resbuf[0] == '1') /* whole number? */
return YES; /* yes, this is good */
else
return NO; /* nope, bad number */
}
/*********************************************************************/
/* */
/* ReadSourceFile() - Read Rexx program source off of disk. */
/* */
/*********************************************************************/
void ReadSourceFile(
PSZ program, /* program to read */
PINSTORE descriptor ) /* saved location */
{
HFILE handle; /* file handle */
FILESTATUS status; /* queried file status */
ULONG size; /* program size */
ULONG action; /* DosOpen action */
ULONG bytes_read; /* bytes read with DosRead */
/* zero out image holder */
MAKERXSTRING(descriptor->image, NULL, 0);
DosOpen(program, /* open the file */
&handle, &action, 0, 0, OPEN_ACTION_OPEN_IF_EXISTS,
OPEN_ACCESS_READONLY + OPEN_SHARE_DENYREADWRITE +
OPEN_FLAGS_FAIL_ON_ERROR + OPEN_FLAGS_WRITE_THROUGH,NULL);
/* retrieve the file size */
DosQueryFileInfo(handle, 1, (PBYTE)&status, sizeof(FILESTATUS));
size = status.cbFile; /* get the file size */
/* allocate buffer for source */
descriptor->source.strptr = malloc(size);
descriptor->source.strlength = size; /* set the size */
/* read in the program */
DosRead(handle, descriptor->source.strptr, size, &bytes_read);
DosClose(handle); /* close the file */
}
/*********************************************************************/
/* */
/* FreeSourceFile() - Release storage for Rexx source program. */
/* */
/*********************************************************************/
void FreeSourceFile(
PINSTORE descriptor ) /* saved location */
{
if (descriptor->source.strptr) /* if have a source */
/* release it */
free(descriptor->source.strptr);
if (descriptor->image.strptr) /* if we have an image */
/* release it also */
DosFreeMem(descriptor->image.strptr);
/* clear out both descriptors */
MAKERXSTRING(descriptor->source, NULL, 0);
MAKERXSTRING(descriptor->image, NULL, 0);
}
/*********************************************************************/
/* */
/* SetRexxVariable - Set the value of a Rexx variable */
/* */
/*********************************************************************/
INT SetRexxVariable(
PSZ name, /* Rexx variable to set */
PSZ value ) /* value to assign */
{
SHVBLOCK block; /* variable pool control block*/
block.shvcode = RXSHV_SYSET; /* do a symbolic set operation*/
block.shvret=(UCHAR)0; /* clear return code field */
block.shvnext=(PSHVBLOCK)0; /* no next block */
/* set variable name string */
MAKERXSTRING(block.shvname, name, strlen(name));
/* set value string */
MAKERXSTRING(block.shvvalue, value, strlen(value));
block.shvnamelen=strlen(name); /* set name length */
block.shvvaluelen=strlen(value); /* set value length */
return RexxVariablePool(&block); /* set the variable */
}
/*********************************************************************/
/* */
/* CalcPrecision - External Rexx function for obtaining current */
/* calculator numeric precision */
/* */
/*********************************************************************/
LONG EXPENTRY CalcPrecision(
PSZ name, /* function name */
LONG argc, /* count of arguments */
PRXSTRING argv, /* argument RXSTRINGs */
PSZ queue, /* current Rexx queue */
PRXSTRING retstr ) /* returned string value */
{
strcpy(RXSTRPTR(*retstr), precision);/* copy over current precision*/
/* set new length */
retstr->strlength = strlen(precision);
return 0; /* completed successfully */
}
/*********************************************************************/
/* */
/* CalcForm - External Rexx function for obtaining current */
/* caculator numeric form */
/* */
/*********************************************************************/
LONG EXPENTRY CalcForm(
PSZ name, /* function name */
LONG argc, /* count of arguments */
PRXSTRING argv, /* argument RXSTRINGs */
PSZ queue, /* current Rexx queue */
PRXSTRING retstr ) /* returned string value */
{
if (form == SCIENTIFIC) { /* scientific precision? */
/* return that word */
strcpy(RXSTRPTR(*retstr), "SCIENTIFIC");
/* set new length */
retstr->strlength = strlen("SCIENTIFIC");
}
else { /* engineering precision */
/* return that word */
strcpy(RXSTRPTR(*retstr), "ENGINEERING");
/* set new length */
retstr->strlength = strlen("ENGINERRING");
}
return 0; /* completed successfully */
}
/*********************************************************************/
/* */
/* CalcCommand - Subcommand handler for the calculator */
/* */
/*********************************************************************/
APIRET EXPENTRY CalcCommand(
PRXSTRING command, /* command to issue */
PUSHORT flags, /* error/failure flags */
PRXSTRING retstr ) /* return code */
{
PSZ scan; /* scan position */
INT memory_number; /* number of memory value */
PSZ memory_item; /* returned memory item */
RXSTRING newdisplay; /* new display value */
/* leading blanks */
scan = command->strptr + strspn(command->strptr, " ");
/* set operation? */
if (!memicmp(scan, "SET ", strlen("SET "))) {
scan += strlen("SET "); /* step past command */
scan += strspn(scan, " "); /* skip to next non-blank */
memory_number = atol(scan); /* get memory number */
if (memory_number <= 0 || /* validate the value */
memory_number > NUMBER_MEMORIES) {
*flags = RXSUBCOM_ERROR; /* raise error condition */
strcpy(retstr->strptr, "2"); /* give return code of 2 */
retstr->strlength = 1; /* set proper length */
return 0; /* finished */
}
scan = strchr(scan, ' '); /* step past number */
if (!scan) { /* no value? */
*flags = RXSUBCOM_ERROR; /* raise error condition */
strcpy(retstr->strptr, "3"); /* give return code of 3 */
retstr->strlength = 1; /* set proper length */
return 0; /* finished */
}
scan += strspn(scan, " "); /* skip to next non-blank */
if (!Datatype(scan, "Number")) { /* if not a valid number */
*flags = RXSUBCOM_ERROR; /* raise error condition */
strcpy(retstr->strptr, "4"); /* give return code of 4 */
retstr->strlength = 1; /* set proper length */
return 0; /* finished */
}
if (memory_bank[memory_number]) /* have a value already? */
free(memory_bank[memory_number]);/* release the value */
/* set the new value */
memory_bank[memory_number] = strdup(scan);
}
/* get operation? */
else if (!memicmp(scan, "GET ", strlen("GET"))) {
scan += strlen("GET "); /* step past command */
scan += strspn(scan, " "); /* skip to next non-blank */
memory_number = atol(scan); /* get memory number */
if (memory_number <= 0 || /* validate the value */
memory_number > NUMBER_MEMORIES) {
*flags = RXSUBCOM_ERROR; /* raise error condition */
strcpy(retstr->strptr, "2"); /* give return code of 2 */
retstr->strlength = 1; /* set proper length */
return 0; /* finished */
}
scan = strchr(scan, ' '); /* step past number */
if (!scan) { /* no value? */
*flags = RXSUBCOM_ERROR; /* raise error condition */
strcpy(retstr->strptr, "3"); /* give return code of 3 */
retstr->strlength = 1; /* set proper length */
return 0; /* finished */
}
scan += strspn(scan, " "); /* skip to next non-blank */
/* get memory contents */
memory_item = memory_bank[memory_number];
if (!memory_item) /* empty memory register? */
memory_item = "0"; /* just use a zero */
/* set the variable ok? */
if (SetRexxVariable(scan, memory_item) > RXSHV_NEWV) {
*flags = RXSUBCOM_ERROR; /* raise error condition */
strcpy(retstr->strptr, "5"); /* give return code of 5 */
retstr->strlength = 1; /* set proper length */
return 0; /* finished */
}
}
/* get operation? */
else if (!memicmp(scan, "DISPLAY ", strlen("DISPLAY"))) {
scan += strlen("DISPLAY"); /* step past command */
scan += strspn(scan, " "); /* skip to next non-blank */
/* make an RXSTRING */
MAKERXSTRING(newdisplay, scan, strlen(scan));
SetDisplay(&newdisplay); /* set the new display */
}
else { /* unknown command */
*flags = RXSUBCOM_FAILURE; /* raise failure condition */
strcpy(retstr->strptr, "1"); /* give return code of 1 */
retstr->strlength = 1; /* set proper length */
return 0; /* finished */
}
/* successful completion */
strcpy(retstr->strptr, "0"); /* give return code of 0 */
retstr->strlength = 1; /* set proper length */
return 0; /* finished */
}
/*********************************************************************/
/* */
/* EditThread - Edit a macro bound to a key */
/* */
/*********************************************************************/
void EditThread(void)
{
RESULTCODES returncodes; /* result of EDITing */
UCHAR loaderror[150]; /* object name buffer */
UCHAR args[150]; /* argument string */
PSZ argptr; /* used to build arg string */
strcpy(args, "E"); /* fill in command name */
argptr = args + sizeof("E"); /* step past name */
/* copy in file name */
strcpy(argptr, operator_names[editted_program]);
/* terminate arguments */
argptr[strlen(operator_names[editted_program]) + 1] = 0;
/* invoke the system editor */
DosExecPgm(loaderror, sizeof(loaderror),
EXEC_SYNC, args, NULL,
&returncodes, "E.EXE");
/* release existing source */
FreeSourceFile(&operator_programs[editted_program]);
/* read in new source */
ReadSourceFile(operator_names[editted_program],
&operator_programs[editted_program]);
DosEnterCritSec(); /* allow thread to complete */
/* send completion message */
WinPostMsg(hwndCalc, WM_EDIT_DONE, NULL, NULL);
DosExit(EXIT_THREAD, 0); /* end the thread */
}
/*********************************************************************/
/* */
/* EditThread - Execute a macro bound to a key */
/* */
/*********************************************************************/
void CalcThread(void)
{
LONG rc; /* rexx return code */
SHORT return_code; /* numeric return code */
ULONG postcount; /* semaphore post count */
RXSTRING result; /* result rxstring */
PRXSTRING resultptr; /* passed result pointer */
while (TRUE) { /* Do Forever */
DosWaitEventSem(calcsem, -1); /* wait for work to do */
DosResetEventSem(calcsem, /* clear posted event */
&postcount);
/* enable I/O system */
while (!WinPostMsg(hwndIOClient, REXX_STARTPROC,
MPFROMLONG(calcthreadid), (MPARAM)0));
DosSleep(0L);
if (global_result) { /* if result needed */
result = *global_result; /* make temp copy */
result.strlength = DISPLAY_WIDTH;/* set result size */
resultptr = &result; /* set result pointer */
}
else
resultptr = NULL; /* no result */
rc = RexxStart(global_argc, /* two arguments */
global_args, /* array of arguments */
/* name of the macro */
operator_names[global_macro_name],
/* instorage program */
(PRXSTRING)&operator_programs[global_macro_name],
"Calculator", /* default command address */
RXFUNCTION, /* calling this a function */
exit_list, /* exits to use */
&return_code, /* numeric value of return str*/
resultptr); /* returned string result */
/* disable I/O system */
while (!WinPostMsg(hwndIOClient, REXX_ENDPROC,
(MPARAM)0, (MPARAM)0))
DosSleep(0L);
if (global_result) { /* if result requested */
/* make into an ASCII-Z string*/
global_result->strptr[result.strlength] = '\0';
/* set returned length */
global_result->strlength = result.strlength;
}
/* signal completion */
WinPostMsg(hwndCalc, global_completion, NULL, NULL);
}
DosExit(EXIT_THREAD, 0); /* end the thread */
}
/*********************************************************************/
/* */
/* init_routine - initialization exit for Rexx macros */
/* */
/*********************************************************************/
LONG EXPENTRY init_routine(
LONG exitno, /* major exit code */
LONG subfunc, /* exit subfunction */
PUCHAR parmblock) /* parameters */
{
if (tracing) /* tracing at start? */
/* turn it on now */
RexxSetTrace(process, calcthreadid);
return 0; /* return with no errors */
}
