cpp.c

<B>Digital的Unix操作系统VAX 4.2源码</B>

	if (enterf==1) p1=copy(p1);
	np=lookup(p1,enterf); *p3=c3; *p2=c2;
	if (np->value!=0 && flslvl==0) newp=subst(p2,np);
	else newp=0;
	return(np);
}

char *
subst(p,sp) register char *p; register struct symtab *sp; {
	static char match[]="%s: argument mismatch";
	register char *ca,*vp; register int params;
	char *actual[MAXFRM]; /* actual[n] is text of nth actual   */
	char actused[MAXFRM]; /* for newline processing in actuals */
	char acttxt[BUFSIZ];  /* space for actuals */
	register int  nlines = 0;

	if (0==(vp=sp->value)) return(p);
	if ((p-macforw)<=macdam) {
		if (++maclvl>symsiz && !rflag) {
			pperror("%s: macro recursion",sp->name); return(p);
		}
	} else maclvl=0;	/* level decreased */
	macforw=p; macdam=0;	/* new target for decrease in level */
	macnam=sp->name;
	dump();
	if (sp==ulnloc) {
		vp=acttxt; *vp++='\0';
		sprintf(vp,"%d",lineno[ifno]); while (*vp++);
	} else if (sp==uflloc) {
		vp=acttxt; *vp++='\0';
		sprintf(vp,"\"%s\"",fnames[ifno]); while (*vp++);
	}
	if (0!=(params= *--vp&0xFF)) {/* definition calls for params */
		register char **pa;
		ca=acttxt; pa=actual;
		if (params==0xFF) params=1;	/* #define foo() ... */
		sloscan(); ++flslvl; /* no expansion during search for actuals */
		plvl= -1;
		do {
			p=skipbl(p); 
/*
 * 007 - copy \n between macro name and (
 */
			if (*inp=='\n') {
				++lineno[ifno];
				putc('\n', fout);
			}
		} while (*inp=='\n');
		/* For bug #2136 */
		maclin=lineno[ifno]; macfil=fnames[ifno]; /* LFL 3-9-88 */
		if (*inp=='(') {
			for (plvl=1; plvl!=0; ) {
				*ca++='\0';
				for (;;) {
					outp=inp=p; p=cotoken(p);
					if (*inp=='(') ++plvl;
					if (*inp==')' && --plvl==0) {--params; break;}
					if (plvl==1 && *inp==',') {--params; break;}
					while (inp<p) *ca++= *inp++;
					if (ca> &acttxt[BUFSIZ])
						pperror("%s: actuals too long",sp->name);
				}
				if (pa>= &actual[MAXFRM]) ppwarn(match,sp->name);
				else { actused[pa-actual]=0; *pa++=ca; }
			}
			nlines = lineno[ifno] - maclin;
			lineno[ifno] = maclin; /* don't count newlines here */
		}
		if (params!=0) ppwarn(match,sp->name);
		while (--params>=0) *pa++=""+1;	/* null string for missing actuals */
		--flslvl; fasscan();
	}
	for (;;) {/* push definition onto front of input stack */
		while (!iswarn(*--vp)) {
			if (bob(p)) {outp=inp=p; p=unfill(p);}
			*--p= *vp;
		}
		if (*vp==warnc) {/* insert actual param */
			ca=actual[*--vp-1];
			while (*--ca) {
				if (bob(p)) {outp=inp=p; p=unfill(p);}
				/* Actuals with newlines confuse line numbering */
				if (*ca == '\n' && actused[*vp-1])
					if (*(ca-1) == '\\') ca--;
					else *--p = ' ';
				else { *--p= *ca; if (*ca == '\n') nlines--; }
			}
			actused[*vp-1] = 1;
		} else {
			if (nlines > 0 )
				while (nlines-- > 0)
					*--p = '\n';
			break;
		}
	}
	outp=inp=p;
	return(p);
}




char *
trmdir(s) register char *s; {
	register char *p = s;
	while (*p++); --p; while (p>s && *--p!='/');
# if unix
	if (p==s) *p++='.';
# endif
	*p='\0';
	return(s);
}

STATIC char *
copy(s) register char *s; {
	register char *old;

	old = malloc(strlen(s)+1);
	if (old==NULL) {pperror("no space"); exit(exfail);}
	strcpy(old, s);
	return(lastcopy=old);
}

char *
strdex(s,c) char *s,c; {
	while (*s) if (*s++==c) return(--s);
	return(0);
}

yywrap(){ return(1); }

main(argc,argv)
	char *argv[];
{
	register int i,c;
	register char *p;
	char *tf,**cp2;
	int inc_std = 1; /* include standard directories in the search path */

# if gcos
	if (setjmp(env)) return (exfail);
# endif
	p="_$ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";
		i=0;
		while (c= *p++) {
			(fastab+COFF)[c] |= IB|NB|SB; (toktyp+COFF)[c]=IDENT;
#if scw2
			/* 53 == 63-10; digits rarely appear in identifiers,
			/* and can never be the first char of an identifier.
			/* 11 == 53*53/sizeof(macbit) .
			*/
			++i; (t21+COFF)[c]=(53*i)/11; (t22+COFF)[c]=i%11;
#endif
		}
	p="0123456789.";
		while (c= *p++) {(fastab+COFF)[c] |= NB|SB; (toktyp+COFF)[c]=NUMBR;}
# if gcos
	p="\n\"'`/\\";
# else
	p="\n\"'/\\";
# endif
		while (c= *p++) (fastab+COFF)[c] |= SB;
# if gcos
	p="\n\"'`\\";
# else
	p="\n\"'\\";
# endif
		while (c= *p++) (fastab+COFF)[c] |= QB;
	p="*\n"; while (c= *p++) (fastab+COFF)[c] |= CB;
	(fastab+COFF)[warnc] |= WB;
	(fastab+COFF)['\0'] |= CB|QB|SB|WB;
	for (i=ALFSIZ; --i>=0; ) slotab[i]=fastab[i]|SB;
	p=" \t\013\f\r";	/* note no \n;	\v not legal for vertical tab? */
		while (c= *p++) (toktyp+COFF)[c]=BLANK;
#if scw2
	for ((t23+COFF)[i=ALFSIZ+7-COFF]=1; --i>=-COFF; )
		if (((t23+COFF)[i]=(t23+COFF+1)[i]<<1)==0) (t23+COFF)[i]=1;
#endif

# if unix
	fnames[ifno=0] = ""; dirnams[0]=dirs[0]=".";
# endif
# if ibm
	fnames[ifno=0] = "";
# endif
# if gcos
	if (inquire(stdin, _TTY)) freopen("*src", "rt", stdin);
# endif
# if gimpel || gcos
	fnames[ifno=0] = (char *)inquire(stdin, _FILENAME);
	dirnams[0] = dirs[0] = trmdir(copy(fnames[0]));
# endif
	for(i=1; i<argc; i++)
		{
		switch(argv[i][0])
			{
			case '-':
# if gcos
			switch(toupper(argv[i][1])) { /* case-independent on GCOS */
# else
			switch(argv[i][1]) {
# endif
				case 'M': mflag++;
				case 'P': pflag++;
				case 'E': 
					/* -Em switch for makefile 
					 * dependencies - vdp05
					  */ 
					if (argv[i][2] == 'm')	 	 
					 	mflag++ ;
					else 
						continue;
				case 'R': ++rflag; continue;
				case 'C': passcom++; continue;
				case 'B': eolcom++; continue;
				case 'D':
					if (predef>prespc+NPREDEF) {
						pperror("too many -D options, ignoring %s",argv[i]);
						continue;
					}
					/* ignore plain "-D" (no argument) */
					if (*(argv[i]+2)) *predef++ = argv[i]+2;
					continue;
				case 'U':
					if (prund>punspc+NPREDEF) {
						pperror("too many -U options, ignoring %s",argv[i]);
						continue;
					}
					*prund++ = argv[i]+2;
					continue;
				case 'I':
					/*
					 * Leave room for two "standard"
					 * include directories and a NULL
					 */
					if (nd >= (MAXIDIRS-3))
					    pperror(
					      "excessive -I file (%s) ignored",
					      argv[i]);
					else if (argv[i][2] == '\0')
					    inc_std = 0; /* no std dirs */
					else dirs[nd++] = argv[i]+2;
					continue;
				case '\0': continue;
				case 'v': continue;
				case 'm':
					if (strcmp (argv[i], "-mips2") == 0)
					    continue;
				default: 
					pperror("unknown flag %s", argv[i]);
					continue;
				}
			default:
				if (fin==FIRSTOPEN) {
					if (0>(fin=open(argv[i], READ))) {
						pperror("No source file %s",argv[i]); exit(8);
					}
					fnames[ifno]=copy(argv[i]);
					infile=copy(argv[i]);
					dirs[0]=dirnams[ifno]=trmdir(argv[i]);
# ifndef gcos
/* too dangerous to have file name in same syntactic position
   be input or output file depending on file redirections,
   so force output to stdout, willy-nilly
	[i don't see what the problem is.  jfr]
*/
				} else if (fout==stdout) {
					if (NULL==(fout=fopen(argv[i], "w"))) {
						pperror("Can't create %s", argv[i]); exit(8);
					} else fclose(stdout);
# endif
				} else pperror("extraneous name %s", argv[i]);
			}
		}
	if (fin == FIRSTOPEN)
		fin = STDIN;

	if (mflag) {
		if (infile==(char *)0) {
			fprintf(stderr,
				"no input file specified with -M flag\n");
			exit(8);
		}
		tf=(char *)rindex(infile, '.');
		if (tf==0) {
			fprintf(stderr, "missing component name on %s\n",
				infile);
			exit(8);
		}
		tf[1]='o';
		tf=(char *)rindex(infile, '/');
		if (tf!=(char *)0)
			infile = tf + 1;
		mout=fout;
		if (NULL==(fout=fopen("/dev/null", "w"))) {
			pperror("Can't open /dev/null");
			exit(8);
		}
	}
	fins[ifno]=fin;
	exfail = 0;
		/* after user -I files here are the standard include libraries */
# if unix
#  if defined(CROSS) || defined(MOXIE)
	if (inc_std)
	  dirs[nd++] = "/usr/local/mips/include";
#  else
	if (inc_std) {
	  dirs[nd++] = "/usr/include";
	}
#  endif
# endif
# if gcos
	dirs[nd++] = "cc/include";
# endif
# if ibm
# ifndef gimpel
	dirs[nd++] = "BTL$CLIB";
# endif
# endif
# ifdef gimpel
	dirs[nd++] = intss() ?  "SYS3.C." : "" ;
# endif
	/* dirs[nd++] = "/compool"; */
	dirs[nd++] = 0;
	defloc=ppsym("define");
	udfloc=ppsym("undef");
	incloc=ppsym("include");
	elsloc=ppsym("else");
	eifloc=ppsym("endif");
	ifdloc=ppsym("ifdef");
	ifnloc=ppsym("ifndef");
	ifloc=ppsym("if");
	eliloc=ppsym("elif");
	lneloc=ppsym("line");
	identloc=ppsym("ident");	/* Sys 5r3 compatibility */
        pragmaloc=ppsym("pragma"); 
	for (i=sizeof(macbit)/sizeof(macbit[0]); --i>=0; ) macbit[i]=0;
# if unix
	ysysloc=stsym("unix");
# endif
#if bsd4_2
	ysysloc=stsym("bsd4_2");		/* aps001 */
#endif
#if ultrix
	ysysloc=stsym("ultrix");		/* aps001 */
#endif
# if mips
	varloc=stsym("mips");
# endif
# if MIPSEL
	varloc=stsym("MIPSEL");
# endif
# if host_mips
	varloc=stsym("host_mips");
# endif
# if gcos
	ysysloc=stsym ("gcos");
# endif
# if ibm
	ysysloc=stsym ("ibm");
# endif
# if pdp11
	varloc=stsym("pdp11");
# endif
# if vax
	varloc=stsym("vax");
# endif
# if interdata
	varloc=stsym ("interdata");
# endif
# if tss
	varloc=stsym ("tss");
# endif
# if os
	varloc=stsym ("os");
# endif
# if mert
	varloc=stsym ("mert");
# endif
# if mc68000
	varloc=stsym("mc68000");
# endif
# if sun
	varloc=stsym("sun");
# endif
	ulnloc=stsym ("__LINE__");
	uflloc=stsym ("__FILE__");

	tf=fnames[ifno]; fnames[ifno]="command line"; lineno[ifno]=1;
	cp2=prespc;
	while (cp2<predef) stsym(*cp2++);
	cp2=punspc;
	while (cp2<prund) {
		if (p=strdex(*cp2, '=')) *p++='\0';
		lookup(*cp2++, DROP);
	}
	pascal_file = (lookup("LANGUAGE_PASCAL",0)->value != 0); /* 3-9-88 */
	if (pascal_file) {
	  (fastab+COFF)['{'] |= SB;
	  (fastab+COFF)['('] |= SB;
	}
	fnames[ifno]=tf;
	pbeg=buffer+NCPS; pbuf=pbeg+BUFSIZ; pend=pbuf+BUFSIZ;

	trulvl = 0; flslvl = 0;
	lineno[0] = 1; sayline(START);
	outp=inp=pend;
	control(pend);
	return (exfail);
}