412 lines
6.7 KiB
C
412 lines
6.7 KiB
C
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/* asmcond.c -- microsoft 80x86 assembler
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**
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** microsoft (r) macro assembler
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** copyright (c) microsoft corp 1986. all rights reserved
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**
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** randy nevin
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**
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** 10/90 - Quick conversion to 32 bit by Jeff Spencer
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*/
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#include <stdio.h>
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#include <string.h>
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#include "asm86.h"
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#include "asmfcn.h"
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#include "asmctype.h"
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static UCHAR PASCAL CODESIZE argsame(void);
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static char elsetable[ELSEMAX];
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#define F_TRUECOND 1
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#define F_ELSE 2
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/*** elsedir - processs <else>
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*
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* elsedir ();
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*
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* Entry
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* Exit
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* Returns
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* Calls
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*/
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VOID PASCAL CODESIZE
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elsedir (
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){
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if (elseflag == F_ELSE)
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/* ELSE already given */
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errorc (E_ELS);
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else if (condlevel == 0)
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/* Not in conditional block */
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errorc (E_NCB);
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else if (generate) {
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generate = FALSE;
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lastcondon--;
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}
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else if (lastcondon + 1 == condlevel && elseflag != F_TRUECOND) {
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generate = TRUE;
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lastcondon++;
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}
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elseflag = F_ELSE;
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}
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/*** endifdir - process <endif> directive
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*
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* endifdir ();
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*
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* Entry
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* Exit
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* Returns
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* Calls
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*/
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VOID PASCAL CODESIZE
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endifdir (
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){
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if (!condlevel)
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/* Not in conditional block */
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errorc (E_NCB);
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else {
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if (lastcondon == condlevel)
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lastcondon--;
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condlevel--;
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/* Pop back 1 cond level */
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/* generate if level is true */
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generate = (condlevel == lastcondon);
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if (generate && !condflag && !elseflag && !loption)
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fSkipList++;
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if (condlevel)
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/* Restore ELSE context */
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elseflag = elsetable[condlevel - 1];
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}
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}
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/*** argblank - check for blank <...>
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*
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* flag = argblank ();
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*
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* Entry
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* Exit
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* Returns TRUE if <...> is not blank
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* Calls
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*/
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UCHAR PASCAL CODESIZE
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argblank (
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){
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REG3 char *start;
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register char cc;
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register char *end;
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if ((cc = NEXTC ()) != '<')
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error (E_EXP,"<");
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start = lbufp;
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while (((cc = NEXTC ()) != '>') && (cc != '\0'))
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;
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if (cc != '>') {
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error (E_EXP,">");
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return (FALSE);
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}
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if (((end = lbufp) - 1) == start)
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return (TRUE);
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lbufp = start;
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while ((cc = NEXTC ()) != '>')
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if (cc != ' ') {
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lbufp = end;
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return (FALSE);
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}
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return (TRUE);
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}
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/*** argscan - return argument of <arg>
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*
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* count = argscan (str);
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*
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* Entry str = pointer to beginning of argument string <....>
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* Exit none
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* Returns number of characters in string <....>
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* Calls
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*/
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USHORT PASCAL CODESIZE
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argscan (
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register UCHAR *str
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){
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register SHORT i;
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if (*str++ != '<') {
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error (E_EXP,"<");
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return(0);
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}
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for (i = 2; *str && *str != '>'; i++, str++) ;
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if (*str != '>')
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error (E_EXP,">");
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return (i);
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}
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/*** argsame - check for both arguments of <....> same
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*
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* flag = argsame ();
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*
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* Entry
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* Exit
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* Returns
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* Calls argscan
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*/
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static UCHAR PASCAL CODESIZE
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argsame (
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){
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register SHORT c1;
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register SHORT c2;
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char *p1;
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char *p2;
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p1 = lbufp;
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c1 = argscan (p1);
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lbufp += c1;
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skipblanks ();
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if (NEXTC () != ',')
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error (E_EXP,"comma");
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skipblanks ();
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p2 = lbufp;
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c2 = argscan (p2);
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lbufp += c2;
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if (c1 == c2)
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return( (UCHAR)(! ( (opkind & IGNORECASE)?
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_memicmp( p1, p2, c1 ): memcmp( p1, p2, c1 ) ) ));
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else
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return( FALSE );
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}
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/*** conddir - process <IFxxx> directives
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*
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* flag = conddir ();
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*
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* Entry
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* Exit
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* Returns
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* Calls
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* Note 1F1 True if pass 1
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* IF2 True if pass 2
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* IF <expr> True if non-zero
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* IFE <expr> True if zero
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* IFDEF <sym> True if defined
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* IFNDEF <sym> True if undefined
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* IFB <arg> True if blank
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* IFNB <arg> True if not blank
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* IFDIF <arg1>,<arg2> True if args are different
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* IFIDN <arg1>,<arg2> True if args are identical
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*/
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VOID PASCAL CODESIZE
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conddir (
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){
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register UCHAR condtrue;
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switch (optyp) {
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case TIF1:
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condtrue = !pass2;
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break;
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case TIF2:
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condtrue = pass2;
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break;
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case TIF:
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condtrue = (exprconst () != 0);
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break;
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case TIFE:
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condtrue = !exprconst ();
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break;
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case TIFDEF:
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case TIFNDEF:
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getatom ();
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if (condtrue = symsrch ())
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condtrue = M_DEFINED & symptr->attr;
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if (optyp == TIFNDEF)
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condtrue = !condtrue;
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break;
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case TIFB:
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condtrue = argblank ();
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break;
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case TIFNB:
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condtrue = !argblank ();
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break;
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case TIFIDN:
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case TIFDIF:
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condtrue = argsame ();
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if (optyp == TIFDIF)
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condtrue = !condtrue;
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break;
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}
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if (!(opkind & CONDCONT)) { /* not ELSEIF form */
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if (condlevel && condlevel <= ELSEMAX)
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elsetable[condlevel - 1] = elseflag;
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/* Another conditional */
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condlevel++;
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elseflag = FALSE;
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if (generate) /* If generating before this cond */
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if (condtrue) { /* Another true cond */
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lastcondon = condlevel;
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elseflag = F_TRUECOND;
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} else
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generate = FALSE;
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else
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/* No errors in false */
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errorcode = 0;
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} else { /* ELSEIF FORM */
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if (elseflag == F_ELSE)
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/* ELSE already given */
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errorc (E_ELS);
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else if (condlevel == 0)
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/* Not in conditional block */
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errorc (E_NCB);
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else if (generate) {
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generate = FALSE;
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lastcondon--;
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errorcode = 0;
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} else if (lastcondon + 1 == condlevel && condtrue
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&& elseflag != F_TRUECOND) {
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generate = TRUE;
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lastcondon++;
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elseflag = F_TRUECOND;
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} else if (!generate)
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errorcode = 0;
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}
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if (errorcode == E_SND){
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errorcode = E_PS1&E_ERRMASK;
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fPass1Err++;
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}
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}
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/*** errdir - process <ERRxxx> directives
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*
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* errdir ();
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*
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* Entry
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* Exit
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* Returns
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* Calls
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* Note ERR Error
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* ERR1 Error if pass 1
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* ERR2 Error if pass 2
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* ERRE <expr> Error if zero
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* ERRNZ <expr> Error if non-zero
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* ERRDEF <sym> Error if defined
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* ERRNDEF <sym> Error if undefined
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* ERRB <arg> Error if blank
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* ERRNB <arg> Error if not blank
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* ERRDIF <arg1>,<arg2> Error if args are different
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* ERRIDN <arg1>,<arg2> Error if args are identical
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*/
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VOID PASCAL CODESIZE
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errdir (
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){
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register UCHAR errtrue;
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register SHORT ecode;
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switch (optyp) {
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case TERR:
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errtrue = TRUE;
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ecode = E_ERR;
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break;
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case TERR1:
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errtrue = !pass2;
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ecode = E_EP1;
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break;
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case TERR2:
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errtrue = pass2;
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ecode = E_EP2;
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break;
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case TERRE:
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errtrue = (exprconst () == 0 ? TRUE : FALSE);
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ecode = E_ERE;
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break;
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case TERRNZ:
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errtrue = (exprconst () == 0 ? FALSE : TRUE);
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ecode = E_ENZ;
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break;
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case TERRDEF:
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case TERRNDEF:
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getatom ();
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if (errtrue = symsrch ())
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errtrue = M_DEFINED & symptr->attr;
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if (optyp == TERRNDEF) {
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errtrue = !errtrue;
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ecode = E_END;
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}
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else
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ecode = E_ESD;
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break;
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case TERRB:
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errtrue = argblank ();
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ecode = E_EBL;
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break;
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case TERRNB:
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errtrue = !argblank ();
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ecode = E_ENB;
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break;
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case TERRIDN:
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case TERRDIF:
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errtrue = argsame ();
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if (optyp == TERRDIF) {
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errtrue = !errtrue;
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ecode = E_EDF;
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}
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else
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ecode = E_EID;
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break;
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}
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if (errorcode == E_SND){
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errorcode = E_PS1&E_ERRMASK;
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fPass1Err++;
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}
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if (errtrue)
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errorc (ecode);
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}
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