838 lines
23 KiB
C++
838 lines
23 KiB
C++
// RPN.C -- expression evaluator
|
|
//
|
|
// Copyright (c) 1988-1990, Microsoft Corporation. All rights reserved.
|
|
//
|
|
// Purpose:
|
|
// This module contains NMAKE's expression evaluator routines.
|
|
//
|
|
// Revision History:
|
|
// 15-Nov-1993 JdR Major speed improvements
|
|
// 15-Oct-1993 HV Use tchar.h instead of mbstring.h directly, change STR*() to _ftcs*()
|
|
// 10-May-1993 HV Add include file mbstring.h
|
|
// Change the str* functions to STR*
|
|
// 04-Dec-1989 SB Add prototype for match() and chkInvokeAndPush()
|
|
// 09-Oct-1989 SB Added HACK to handle pointer arithmetic quirks; Done to
|
|
// avoid rewriting entire module
|
|
// 08-Oct-1989 SB '!if' expressions can be decimal, octal or hex now
|
|
// 05-Apr-1989 SB made all funcs NEAR; Reqd to make all function calls NEAR
|
|
// 19-Sep-1988 RB Split ptr_to_string(). Process ESCH in program invocations.
|
|
// 17-Aug-1988 RB Clean up.
|
|
// 28-Jun-1988 rj Added doCmd parameter to execLine.
|
|
// 23-Jun-1988 rj Add parameter to execLine (no echo of command).
|
|
// 25-May-1988 rb Change isspace to _istspace, isdigit to _istdigit.
|
|
|
|
#include "precomp.h"
|
|
#pragma hdrstop
|
|
|
|
#include "rpn.h"
|
|
|
|
char * GetEndQuote(void);
|
|
char * GetEndBracket(void);
|
|
void check_syntax_error(UCHAR);
|
|
void type_and_val(UCHAR, INT_PTR);
|
|
void pushIntoList(void);
|
|
void printList(void);
|
|
BOOL handleExpr(void);
|
|
BOOL handleExists(char*);
|
|
BOOL handleDefines(char*);
|
|
void getTok(void);
|
|
BOOL do_binary_op(UCHAR);
|
|
BOOL do_unary_op(UCHAR);
|
|
UCHAR match(char *tokPtr);
|
|
void chkInvocAndPush(RPNINFO *pListPtr);
|
|
|
|
#define TEMPSTACKSIZE 512 // size of temporary stack
|
|
#define LISTSIZE 1024 // size of list of rpn-form items
|
|
|
|
RPNINFO tempStack[TEMPSTACKSIZE]; // temporary/operand stack
|
|
RPNINFO rpnList[LISTSIZE]; // list of items in rpn order
|
|
char * text; // pointer to expr text in lbufPtr
|
|
UCHAR prevTok; // initial token put on tempstack
|
|
BOOL done; // true if there are no more tokens
|
|
UCHAR errRow; // first token is '(' so error table
|
|
// row val is 3. See check_syntax....
|
|
RPNINFO * pTop; // top item on tempStack
|
|
RPNINFO * pList; // next free slot in list
|
|
RPNINFO * pEnd = &(tempStack[TEMPSTACKSIZE-1]);
|
|
RPNINFO * pListEnd = &(rpnList[LISTSIZE-1]);
|
|
RPNINFO tokRec;
|
|
|
|
|
|
// do_binary_op() - do operation on two stack operands
|
|
//
|
|
// arguments: type - operator type code
|
|
//
|
|
// actions : pops first operand from the stack (tempStack).
|
|
// checks the types of the two operands (the operand
|
|
// that was popped as well as the operand currently
|
|
// on top of the stack).
|
|
// if both operands are integers then do the operation
|
|
// else if both operands are strings and operation is
|
|
// the equality operation then do it.
|
|
// else return FALSE ( illegal operation )
|
|
//
|
|
// modifies : tempStack - top element will now be the result of
|
|
// the operation.
|
|
|
|
BOOL
|
|
do_binary_op(
|
|
UCHAR type
|
|
)
|
|
{
|
|
INT_PTR *left;
|
|
INT_PTR *right;
|
|
RPNINFO *pOldTop;
|
|
|
|
pOldTop = pTop--; // pop one item off stack, with a ptr to it
|
|
right = &pOldTop->valPtr;
|
|
left = &pTop->valPtr;
|
|
|
|
if ((pOldTop->type == INTEGER) && (pTop->type == INTEGER)) {
|
|
switch (type) {
|
|
case LOGICAL_OR:
|
|
*left = *left || *right;
|
|
break;
|
|
|
|
case LOGICAL_AND:
|
|
*left = *left && *right;
|
|
break;
|
|
|
|
case BIT_OR:
|
|
*left |= *right;
|
|
break;
|
|
|
|
case BIT_XOR:
|
|
*left ^= *right;
|
|
break;
|
|
|
|
case BIT_AND:
|
|
*left &= *right;
|
|
break;
|
|
|
|
case NOT_EQUAL:
|
|
*left = *right != *left;
|
|
break;
|
|
|
|
case EQUAL:
|
|
*left = *right == *left;
|
|
break;
|
|
|
|
case GREATER_THAN:
|
|
*left = *left > *right;
|
|
break;
|
|
|
|
case LESS_THAN:
|
|
*left = *left < *right;
|
|
break;
|
|
|
|
case GREATER_EQ:
|
|
*left = *left >= *right;
|
|
break;
|
|
|
|
case LESS_EQ:
|
|
*left = *left <= *right;
|
|
break;
|
|
|
|
case SHFT_RIGHT:
|
|
*left >>= *right;
|
|
break;
|
|
|
|
case SHFT_LEFT:
|
|
*left <<= *right;
|
|
break;
|
|
|
|
case BINARY_MINUS:
|
|
*left -= *right;
|
|
break;
|
|
|
|
case ADD:
|
|
*left += *right;
|
|
break;
|
|
|
|
case MODULUS:
|
|
if (!*right)
|
|
makeError(line, DIVIDE_BY_ZERO);
|
|
*left %= *right;
|
|
break;
|
|
|
|
case DIVIDE:
|
|
if (!*right)
|
|
makeError(line, DIVIDE_BY_ZERO);
|
|
*left /= *right;
|
|
break;
|
|
|
|
case MULTIPLY:
|
|
*left *= *right;
|
|
break;
|
|
|
|
default:
|
|
return(FALSE);
|
|
break;
|
|
}
|
|
} else if ((pOldTop->type == STR) &&
|
|
(pTop->type == STR) &&
|
|
((type == EQUAL) || (type == NOT_EQUAL))) {
|
|
pTop->type = INTEGER;
|
|
*left = !_tcscmp((char *) *left, (char *) *right);
|
|
if (type == NOT_EQUAL) {
|
|
if (!do_unary_op(LOGICAL_NOT)) {
|
|
return(FALSE);
|
|
}
|
|
}
|
|
} else {
|
|
return(FALSE);
|
|
}
|
|
|
|
return(TRUE);
|
|
}
|
|
|
|
|
|
// do_unary_op() - do operation on top stack operand
|
|
//
|
|
// arguments: type - operator type code
|
|
//
|
|
// actions : checks the type of the top operand on the stack
|
|
// if operand is an integer then do the operation
|
|
// else return FALSE ( illegal operation )
|
|
//
|
|
// modifies : tempStack - top element will now be the result of
|
|
// the operation.
|
|
|
|
BOOL
|
|
do_unary_op(
|
|
UCHAR type
|
|
)
|
|
{
|
|
INT_PTR *top;
|
|
|
|
top = &pTop->valPtr;
|
|
|
|
if (pTop->type == INTEGER) {
|
|
switch (type) {
|
|
case UNARY_MINUS:
|
|
*top = -*top;
|
|
break;
|
|
|
|
case COMPLEMENT:
|
|
*top = ~*top;
|
|
break;
|
|
|
|
case LOGICAL_NOT:
|
|
*top = !*top;
|
|
break;
|
|
|
|
default:
|
|
return(FALSE);
|
|
break;
|
|
}
|
|
} else {
|
|
return(FALSE);
|
|
}
|
|
|
|
return(TRUE);
|
|
}
|
|
|
|
|
|
|
|
// GetEndQuote
|
|
//
|
|
// Return the pointer to the next double-quote character in text. A
|
|
// double-quote followed immediately by a double-quote is skipped.
|
|
//
|
|
// text : the global ptr to the buffer is moved up beyond this string.
|
|
|
|
char *
|
|
GetEndQuote()
|
|
{
|
|
char *pStart;
|
|
|
|
for (pStart = ++text; *text; ++text)
|
|
if (*text == '\"') {
|
|
if (text[1] == '\"')
|
|
++text;
|
|
else
|
|
break;
|
|
}
|
|
|
|
if (!*text)
|
|
makeError(line, SYNTAX_MISSING_END_CHAR, '\"');
|
|
|
|
*text++ = '\0'; // null byte over closing quote
|
|
return(pStart);
|
|
}
|
|
|
|
|
|
// GetEndBracket
|
|
//
|
|
// Lexes a program invocation.
|
|
//
|
|
// Program invocation is of the form: [ prog <arglist> ].
|
|
// Process escaped ']' here because this is where we do the lexing.
|
|
//
|
|
// text : the global ptr to the buffer is moved up beyond this string.
|
|
|
|
char *
|
|
GetEndBracket()
|
|
{
|
|
char *pStart;
|
|
|
|
for (pStart = ++text; *text; text = _tcsinc (text)) {
|
|
if (*text == ESCH && text[1] == ']')
|
|
memmove(text, text + 1, 1 + _tcslen(text + 1));
|
|
else if (*text == ']')
|
|
break;
|
|
}
|
|
|
|
if (!*text)
|
|
makeError(line, SYNTAX_MISSING_END_CHAR, ']');
|
|
|
|
*text++ = '\0'; // null byte over closing bracket
|
|
return(pStart);
|
|
}
|
|
|
|
|
|
// check_syntax_error() - check if there is a syntax error in expr
|
|
//
|
|
// arguments: type - type of the current token
|
|
//
|
|
// actions: checks the type of the current token against the type
|
|
// of the previous token.
|
|
//
|
|
// ERROR_TABLE :
|
|
// 2nd tok
|
|
//
|
|
// alpha op unary_op ( )
|
|
// ------------------------------------------------
|
|
// alpha | 0 | 1 | 0 | 0 | 1 |
|
|
// -------------------------------------------------
|
|
// op | 1 | 0 | 1 | 1 | 0 |
|
|
// -------------------------------------------------
|
|
// unary_op | 1 | 0 | 0 | 1 | 0 |
|
|
// -------------------------------------------------
|
|
// ( | 1 | 0 | 1 | 1 | 0 |
|
|
// -------------------------------------------------
|
|
// ) | 0 | 1 | 0 | 0 | 1 |
|
|
// -------------------------------------------------
|
|
// 1st tok.
|
|
//
|
|
// alpha : a primary ( integer, str, prog. invoc. )
|
|
// op : a binary operator
|
|
// unary_op : a unary operator ( ~, !, - ). A ZERO in the slot => error
|
|
//
|
|
// NOTE: ANY CHANGES TO THE TYPE VALUES WILL AFFECT THIS ROUTINE.
|
|
|
|
void
|
|
check_syntax_error(
|
|
UCHAR newTok
|
|
)
|
|
{
|
|
extern UCHAR errTable[5][5];
|
|
extern UCHAR errRow;
|
|
UCHAR errCol;
|
|
|
|
if (newTok == LEFT_PAREN)
|
|
errCol = 3;
|
|
else if (newTok == RIGHT_PAREN)
|
|
errCol = 4;
|
|
else if (newTok > LOGICAL_NOT)
|
|
errCol = 0;
|
|
else if (newTok > MULTIPLY)
|
|
errCol = 2;
|
|
else
|
|
errCol = 1;
|
|
|
|
if (!errTable[errRow][errCol])
|
|
makeError(line, SYNTAX_INVALID_EXPR);
|
|
errRow = errCol; // this becomes the first token the next time
|
|
}
|
|
|
|
|
|
// type_and_val()
|
|
//
|
|
// arguments: type - the type code of the present operator.
|
|
// val - ptr to a str/or integer
|
|
//
|
|
// initialises a record with the type code, after checking for any
|
|
// syntax errors. The new token is checked against the previous token
|
|
// for illegal combinations of tokens.
|
|
// initialises the record with the integer value/string ptr.
|
|
|
|
void
|
|
type_and_val(
|
|
UCHAR type,
|
|
INT_PTR val
|
|
)
|
|
{
|
|
extern RPNINFO tokRec; // returned to handleExpr
|
|
extern UCHAR prevTok; // token last seen
|
|
|
|
check_syntax_error(type);
|
|
prevTok = type;
|
|
tokRec.type = type;
|
|
tokRec.valPtr = val;
|
|
}
|
|
|
|
|
|
// match()
|
|
//
|
|
// arguments: tokPtr - ptr to a token string ( in tokTable )
|
|
//
|
|
// actions : looks for a substring in the expression buffer
|
|
// pointed to by 'text', that matches the given token.
|
|
// if substring found, returns TRUE, else returns FALSE.
|
|
|
|
UCHAR
|
|
match(
|
|
char *tokPtr
|
|
)
|
|
{
|
|
extern char *text;
|
|
char *t = text;
|
|
|
|
while (*tokPtr && (*t == *tokPtr)) {
|
|
t++;
|
|
tokPtr++;
|
|
}
|
|
if (!*tokPtr) {
|
|
text = t;
|
|
return(TRUE);
|
|
}
|
|
return(FALSE);
|
|
}
|
|
|
|
|
|
// getTok()
|
|
//
|
|
// arguments: none
|
|
//
|
|
// gets a token from the expression buffer.
|
|
// if the current char from the buffer is a space/tab, skip space/tabs
|
|
// until we get a non-space char ( could be NULL char ).
|
|
// Check if we are now at the beginning of one of the tokens in the
|
|
// tokenTable. This covers most tokens.
|
|
// Check if we have a minus. If a minus and the previous token was an
|
|
// integer, this is a binary minus, else a unary minus.
|
|
// If the current char is a double-quote, we are at the start of a
|
|
// string-token.
|
|
// If the current char is a '[', we are at the start of a program
|
|
// invocation. In both cases, the escape character is '\\'.
|
|
// If current char is a digit, we have a constant ( integer ).
|
|
// Else we have defined(ID).
|
|
// If none of the above, if current char is NULL, break out, else
|
|
// report error ( illegal character string has been found ).
|
|
//
|
|
// If we came to the NULL char at the end of the buffer, set global
|
|
// flag 'done' to TRUE, return a RIGHT_PAREN to match the opening
|
|
// LEFT_PAREN.
|
|
//
|
|
//
|
|
// modifies: text : ptr to expression buffer.
|
|
// prevTok: thru' calls to type_and_val().
|
|
// done : at end of buffer
|
|
// errRow : index into error table, thru calls to
|
|
// type_and_val()
|
|
// returns : token in tokRec(global, static to the module). The
|
|
// token has the new type/integer/ptr values.
|
|
|
|
void
|
|
getTok()
|
|
{
|
|
extern UCHAR prevTok;
|
|
extern BOOL done;
|
|
char c;
|
|
TOKTABREC *p;
|
|
char *ptr;
|
|
long constant;
|
|
|
|
c = *text;
|
|
if (c == ' ' || c == '\t') {
|
|
while(_istspace(c))
|
|
c = *++text; // skip white spaces
|
|
}
|
|
|
|
if (IS_OPERATORCHAR(c)) {
|
|
for (p = tokTable; p->op_str && !match(p->op_str); p++)
|
|
;
|
|
} else {
|
|
// make p point to last entry in table
|
|
p = &tokTable[(sizeof(tokTable) / sizeof(TOKTABREC)) - 1];
|
|
}
|
|
|
|
if (p->op_str) {
|
|
type_and_val(p->op, 0);
|
|
} else
|
|
if (c == '-') { // now check if binary or unary minus to be returned
|
|
text++;
|
|
if (prevTok == INTEGER)
|
|
type_and_val(BINARY_MINUS, 0);
|
|
else
|
|
type_and_val(UNARY_MINUS, 0);
|
|
} else
|
|
if (c == '\"') {
|
|
type_and_val(STR, (INT_PTR) GetEndQuote());
|
|
} else
|
|
if (c == '[') {
|
|
type_and_val(PROG_INVOC_STR, (INT_PTR) GetEndBracket());
|
|
} else { // integers and IDs handled here
|
|
if (_istdigit(c)) {
|
|
char *pNumber = text;
|
|
|
|
errno = 0; // Accept decimal, octal or hex no (richgi)
|
|
constant = strtol(text, &text, 0);
|
|
if (errno == ERANGE) {
|
|
*text = '\0';
|
|
makeError(line, CONST_TOO_BIG, pNumber);
|
|
}
|
|
|
|
if (_totupper(*text) == 'L')
|
|
text++;
|
|
type_and_val(INTEGER, constant);
|
|
} else { // defined(ID) comes here
|
|
if (c) {
|
|
if (!_tcsnicmp(text, "DEFINED", 7)) {
|
|
if (!(ptr = _tcschr(text, '(')))
|
|
makeError(line, SYNTAX_INVALID_EXPR);
|
|
ptr++;
|
|
text = ptr + _tcscspn(ptr, ")");
|
|
*text++ = '\0';
|
|
type_and_val(INTEGER, handleDefines(ptr));
|
|
}
|
|
else if (!_tcsnicmp(text, "EXIST", 5)) {
|
|
if (!(ptr = _tcschr(text, '(')))
|
|
makeError(line, SYNTAX_INVALID_EXPR);
|
|
ptr++;
|
|
text = ptr + _tcscspn(ptr, ")");
|
|
*text++ = '\0';
|
|
type_and_val(INTEGER, handleExists(ptr));
|
|
}
|
|
else
|
|
makeError(line, SYNTAX_INVALID_EXPR);
|
|
} else { // we are now at the end of the string (c is null)
|
|
done = TRUE;
|
|
type_and_val(RIGHT_PAREN, 0); // this is the last token
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
// chkInvocAndPush() - check if program invocation required
|
|
//
|
|
// arguments: pListPtr - might have a program invocation string
|
|
// present.
|
|
//
|
|
// actions : if this is a program invocation string, make the
|
|
// program invocation.
|
|
// the return value is got and placed on the stack.
|
|
// the type of the new stack element is now INTEGER.
|
|
// else place list item on stack.
|
|
//
|
|
// in either case it moves one item from list to stack.
|
|
|
|
void
|
|
chkInvocAndPush(
|
|
RPNINFO *pListPtr
|
|
)
|
|
{
|
|
++pTop;
|
|
if (pListPtr->type == PROG_INVOC_STR) {
|
|
pTop->valPtr = execLine((char *) pListPtr->valPtr, FALSE, TRUE, FALSE, NULL);
|
|
pTop->type = INTEGER;
|
|
} else {
|
|
*pTop = *pListPtr;
|
|
}
|
|
}
|
|
|
|
|
|
// processList()
|
|
//
|
|
// arguments: none
|
|
//
|
|
// actions : remove an item from the list.
|
|
// if the item is an operand, place it on the operand
|
|
// stack (tempStack).
|
|
// if the operand is a program invocation string, make
|
|
// the invocation, place the return code on stack.
|
|
// if the item is an operator, call the function to
|
|
// do the operation on one/two elements on tempStack.
|
|
//
|
|
// finally, check if there is exactly one item on stack.
|
|
// if this item has a value of zero, return FALSE.
|
|
// else return TRUE.
|
|
// if more than one item on stack, abort with error.
|
|
//
|
|
// modifies: pTop - ptr to top of tempStack.
|
|
// pList - ptr to next position in list.
|
|
|
|
BOOL
|
|
processList()
|
|
{
|
|
extern RPNINFO *pList;
|
|
extern RPNINFO *pTop;
|
|
RPNINFO *pTemp;
|
|
BOOL (* func)(UCHAR);
|
|
|
|
for (pTemp = rpnList; pTemp < pList; pTemp++) {
|
|
if (pTemp->type > LOGICAL_NOT) { // operand
|
|
chkInvocAndPush(pTemp);
|
|
} else {
|
|
if (pTemp->type > MULTIPLY)
|
|
func = do_unary_op;
|
|
else
|
|
func = do_binary_op;
|
|
|
|
if (!(*func)(pTemp->type))
|
|
makeError(line, BAD_OP_TYPES);
|
|
}
|
|
}
|
|
|
|
if ((pTop == tempStack) && (pTop->type == INTEGER))
|
|
if (!pTop->valPtr)
|
|
return(FALSE);
|
|
else
|
|
return(TRUE);
|
|
else
|
|
makeError(line, SYNTAX_INVALID_EXPR);
|
|
|
|
return(FALSE);
|
|
}
|
|
|
|
|
|
// pushIntoList()
|
|
//
|
|
// arguments: none
|
|
//
|
|
// actions : pops an item from the tempStack and pushes it onto
|
|
// the list. checks list for overflow ( internal error )
|
|
// and tempStack for underflow ( syntax error in expr ).
|
|
//
|
|
// modifies: tempTop - index of top of tempStack.
|
|
// nextInList - index to next position in list.
|
|
|
|
void
|
|
pushIntoList()
|
|
{
|
|
if (pTop < tempStack)
|
|
makeError(line, SYNTAX_INVALID_EXPR);
|
|
|
|
if (pList > pListEnd)
|
|
makeError(line, EXPR_TOO_LONG_INTERNAL);
|
|
|
|
#if !defined(NDEBUG)
|
|
// Keep track of the high water mark on the stack just for grins
|
|
{
|
|
static int iStackMax = 0;
|
|
if ( pList - rpnList > iStackMax )
|
|
iStackMax = (int) (pList - rpnList);
|
|
}
|
|
#endif
|
|
|
|
*pList++ = *pTop--;
|
|
}
|
|
|
|
|
|
// handleExpr()
|
|
//
|
|
// arguments: text - pointer to the buffer that has the expression.
|
|
//
|
|
// actions : calls getTok() to get tokens from the buffer. Places
|
|
// tokens in a tempStack, and moves them into a list in
|
|
// reverse-polish order.
|
|
//
|
|
// We need the list so that ALL syntax errors are caught
|
|
// BEFORE processing of the expression begins (especially
|
|
// program invocations that have side effects)
|
|
//
|
|
// Once the list is available, an operand stack is used
|
|
// Items are popped and pushed from this stack by the
|
|
// evaluation routines (add, mult, negate etc.)
|
|
//
|
|
// we don't really need a separate operand stack. the
|
|
// tempStack has served its purpose when the list is
|
|
// formed and so it may be used for operand processing.
|
|
|
|
BOOL
|
|
handleExpr()
|
|
{
|
|
extern RPNINFO tokRec;
|
|
BOOL fRParen; // was the token got a right paren?
|
|
extern BOOL done;
|
|
extern RPNINFO *pTop, *pList;
|
|
extern UCHAR errRow;
|
|
extern UCHAR prevTok;
|
|
|
|
pTop = tempStack;
|
|
pList = rpnList;
|
|
done = FALSE;
|
|
errRow = 3; // row for the first token put in,left paren
|
|
prevTok = LEFT_PAREN;
|
|
type_and_val(LEFT_PAREN, 0);
|
|
*pTop = tokRec;
|
|
|
|
while (!done) { // while there are more tokens in buffer
|
|
getTok();
|
|
fRParen = FALSE;
|
|
if (tokRec.type != LEFT_PAREN) {
|
|
while (precVector[tokRec.type] <= precVector[pTop->type]) {
|
|
if (!precVector[tokRec.type]) { // if RIGHT_PAREN pop till a
|
|
// left paren is seen
|
|
while (pTop->type != LEFT_PAREN)
|
|
pushIntoList();
|
|
fRParen = TRUE;
|
|
if (pTop < tempStack) {
|
|
makeError(line, SYNTAX_INVALID_EXPR);
|
|
} else {
|
|
pTop--; // pop the left paren
|
|
break;
|
|
}
|
|
} else {
|
|
pushIntoList();
|
|
}
|
|
}
|
|
}
|
|
// if token is a left paren, it has to go on the stack
|
|
if (!fRParen) {
|
|
if (pTop == pEnd)
|
|
makeError(line, EXPR_TOO_LONG_INTERNAL);
|
|
else
|
|
*++pTop = tokRec;
|
|
}
|
|
}
|
|
|
|
// check the stack here for not empty state
|
|
if (pTop != tempStack - 1)
|
|
makeError(line, SYNTAX_INVALID_EXPR);
|
|
return(processList());
|
|
}
|
|
|
|
|
|
// handleDefines()
|
|
//
|
|
// arguments: t pointer to buffer that has the identifier
|
|
//
|
|
// actions: Checks if one of 'ID' is present.
|
|
// Aborts with error if more IDs present.
|
|
// Is called for ifdef/ifndef/defined(ID).
|
|
//
|
|
// returns : TRUE if ID found in table. FALSE otherwise.
|
|
|
|
BOOL
|
|
handleDefines(
|
|
char *t
|
|
)
|
|
{
|
|
char *s;
|
|
|
|
s = _tcstok(t, " \t");
|
|
if (_tcstok(NULL, " \t")) {
|
|
makeError(line, SYNTAX_UNEXPECTED_TOKEN, s);
|
|
}
|
|
|
|
if (!s) {
|
|
makeError(line, MISSING_ARG_BEFORE_PAREN);
|
|
}
|
|
|
|
if (findMacro(s)) {
|
|
return(TRUE);
|
|
}
|
|
|
|
return(FALSE);
|
|
}
|
|
|
|
|
|
// handleExists()
|
|
//
|
|
// arguments: t pointer to buffer that has the identifier
|
|
//
|
|
// actions: Checks if 'name' is a valid file/directory
|
|
// Aborts with error if more names present.
|
|
// Is called for exist(name).
|
|
//
|
|
// returns : TRUE if ID found in table. FALSE otherwise.
|
|
|
|
BOOL
|
|
handleExists(
|
|
char *_t
|
|
)
|
|
{
|
|
char *s;
|
|
char *szUnQuoted;
|
|
BOOL fResult = FALSE;
|
|
char *szDelim;
|
|
char *t;
|
|
|
|
// make local copy, strip blank space before and after string
|
|
char *tSav = t = makeString(_t);
|
|
while (*t && WHITESPACE (*t)) {
|
|
t++;
|
|
}
|
|
s = t + _tcslen(t);
|
|
while (s > t) {
|
|
s = _tcsdec(t, s);
|
|
if (WHITESPACE (*s)) {
|
|
*s = '\0';
|
|
}
|
|
else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
szDelim = ('\"' == *t) ? "\t" : " \t";
|
|
// DS 15360: if id starts with a quote,
|
|
// use "\t" instead of " \t" in _tcstok
|
|
// (handle paths with embedded spaces)
|
|
s = _tcstok(t, szDelim);
|
|
if (_tcstok(NULL, szDelim)) {
|
|
makeError(line, SYNTAX_UNEXPECTED_TOKEN, s);
|
|
}
|
|
|
|
if (NULL == s || NULL == (szUnQuoted = unQuote(s))) { // handle quoted names
|
|
makeError(line, MISSING_ARG_BEFORE_PAREN);
|
|
}
|
|
|
|
if (!_access(szUnQuoted, 0x00)) { // existence check
|
|
fResult = TRUE;
|
|
}
|
|
|
|
FREE(szUnQuoted);
|
|
FREE(tSav);
|
|
|
|
return(fResult);
|
|
}
|
|
|
|
|
|
// evalExpr()
|
|
//
|
|
// arguments: t pointer to buffer that has the expression
|
|
// kind specifies if it is if/ifdef/ifndef etc.
|
|
//
|
|
//
|
|
//
|
|
// returns : TRUE if expression evaluates to true.
|
|
// FALSE otherwise.
|
|
|
|
BOOL
|
|
evalExpr(
|
|
char *t,
|
|
UCHAR kind
|
|
)
|
|
{
|
|
if (!*t) {
|
|
makeError(line, SYNTAX_MISSING_DIRECTIVE);
|
|
}
|
|
|
|
switch (kind) {
|
|
case IFDEF_TYPE:
|
|
case ELSE_IFDEF_TYPE:
|
|
return(handleDefines(t));
|
|
|
|
case IFNDEF_TYPE:
|
|
case ELSE_IFNDEF_TYPE:
|
|
return((BOOL)!handleDefines(t));
|
|
|
|
default:
|
|
text = t;
|
|
return(handleExpr());
|
|
}
|
|
}
|