V7M/src/cmd/cpp/cpp.c
#
# include "stdio.h"
/* C command
/* written by John F. Reiser
/* July/August 1978
*/
#define STATIC
#define STDIN 0
#define STDOUT 1
#define STDERR 2
#define READ 0
#define WRITE 1
#define SALT '#'
#ifndef BUFSIZ
#define BUFSIZ 512
#endif
char *pbeg,*pbuf,*pend;
char *outp,*inp;
char *newp;
char cinit;
/* some code depends on whether characters are sign or zero extended */
/* #if '\377' < 0 not used here, old cpp doesn't understand */
#if pdp11 | vax
#define COFF 128
#else
#define COFF 0
#endif
# if gcos
#define ALFSIZ 512 /* alphabet size */
# else
#define ALFSIZ 256 /* alphabet size */
# endif
char macbit[ALFSIZ+11];
char toktyp[ALFSIZ];
#define BLANK 1
#define IDENT 2
#define NUMBR 3
/* a superimposed code is used to reduce the number of calls to the
/* symbol table lookup routine. (if the kth character of an identifier
/* is 'a' and there are no macro names whose kth character is 'a'
/* then the identifier cannot be a macro name, hence there is no need
/* to look in the symbol table.) 'scw1' enables the test based on
/* single characters and their position in the identifier. 'scw2'
/* enables the test based on adjacent pairs of characters and their
/* position in the identifier. scw1 typically costs 1 indexed fetch,
/* an AND, and a jump per character of identifier, until the identifier
/* is known as a non-macro name or until the end of the identifier.
/* scw1 is inexpensive. scw2 typically costs 4 indexed fetches,
/* an add, an AND, and a jump per character of identifier, but it is also
/* slightly more effective at reducing symbol table searches.
/* scw2 usually costs too much because the symbol table search is
/* usually short; but if symbol table search should become expensive,
/* the code is here.
/* using both scw1 and scw2 is of dubious value.
*/
#define scw1 1
#define scw2 0
#if scw2
char t21[ALFSIZ],t22[ALFSIZ],t23[ALFSIZ+8];
#endif
#if scw1
#define b0 1
#define b1 2
#define b2 4
#define b3 8
#define b4 16
#define b5 32
#define b6 64
#define b7 128
#endif
#define IB 1
#define SB 2
#define NB 4
#define CB 8
#define QB 16
#define WB 32
char fastab[ALFSIZ];
char slotab[ALFSIZ];
char *ptrtab;
#define isslo (ptrtab==(slotab+COFF))
#define isid(a) ((fastab+COFF)[a]&IB)
#define isspc(a) (ptrtab[a]&SB)
#define isnum(a) ((fastab+COFF)[a]&NB)
#define iscom(a) ((fastab+COFF)[a]&CB)
#define isquo(a) ((fastab+COFF)[a]&QB)
#define iswarn(a) ((fastab+COFF)[a]&WB)
#define eob(a) ((a)>=pend)
#define bob(a) (pbeg>=(a))
char buffer[8+BUFSIZ+BUFSIZ+8];
# define SBSIZE 12000
char sbf[SBSIZE];
char *savch = sbf;
# define DROP 0xFE /* special character not legal ASCII or EBCDIC */
# define WARN DROP
# define SAME 0
# define MAXINC 10
# define MAXFRE 14 /* max buffers of macro pushback */
# define MAXFRM 31 /* max number of formals/actuals to a macro */
static char warnc = WARN;
int mactop,fretop;
char *instack[MAXFRE],*bufstack[MAXFRE],*endbuf[MAXFRE];
int plvl; /* parenthesis level during scan for macro actuals */
int maclin; /* line number of macro call requiring actuals */
char *macfil; /* file name of macro call requiring actuals */
char *macnam; /* name of macro requiring actuals */
int maclvl; /* # calls since last decrease in nesting level */
char *macforw; /* pointer which must be exceeded to decrease nesting level */
int macdam; /* offset to macforw due to buffer shifting */
#if tgp
int tgpscan; /* flag for dump(); */
#endif
STATIC int inctop[MAXINC];
STATIC char *fnames[MAXINC];
STATIC char *dirnams[MAXINC]; /* actual directory of #include files */
STATIC int fins[MAXINC];
STATIC int lineno[MAXINC];
STATIC char *dirs[10]; /* -I and <> directories */
char *strdex(), *copy(), *subst(), *trmdir();
struct symtab *stsym();
STATIC int fin = STDIN;
STATIC FILE *fout = stdout;
STATIC int nd = 1;
STATIC int pflag; /* don't put out lines "# 12 foo.c" */
STATIC int passcom; /* don't delete comments */
STATIC int rflag; /* allow macro recursion */
STATIC int ifno;
# define NPREDEF 20
STATIC char *prespc[NPREDEF];
STATIC char **predef = prespc;
STATIC char *punspc[NPREDEF];
STATIC char **prund = punspc;
STATIC int exfail;
struct symtab {
char *name;
char *value;
} *lastsym, *lookup(), *slookup();
# if gcos
#include <setjmp.h>
static jmp_buf env;
# define main mainpp
# undef exit
# define exit(S) longjmp(env, 1)
# define open(S,D) fileno(fopen(S, "r"))
# define close(F) fclose(_f[F])
extern FILE *_f[];
# define symsiz 500
# else
# define symsiz 400
# endif
STATIC struct symtab stab[symsiz];
STATIC struct symtab *defloc;
STATIC struct symtab *udfloc;
STATIC struct symtab *incloc;
STATIC struct symtab *ifloc;
STATIC struct symtab *elsloc;
STATIC struct symtab *eifloc;
STATIC struct symtab *ifdloc;
STATIC struct symtab *ifnloc;
STATIC struct symtab *ysysloc;
STATIC struct symtab *varloc;
STATIC struct symtab *lneloc;
STATIC struct symtab *ulnloc;
STATIC struct symtab *uflloc;
STATIC int trulvl;
STATIC int flslvl;
sayline() {
if (pflag==0) fprintf(fout,"# %d \"%s\"\n", lineno[ifno], fnames[ifno]);
}
/* data structure guide
/*
/* most of the scanning takes place in the buffer:
/*
/* (low address) (high address)
/* pbeg pbuf pend
/* | <-- BUFSIZ chars --> | <-- BUFSIZ chars --> |
/* _______________________________________________________________________
/* |_______________________________________________________________________|
/* | | |
/* |<-- waiting -->| |<-- waiting -->
/* | to be |<-- current -->| to be
/* | written | token | scanned
/* | | |
/* outp inp p
/*
/* *outp first char not yet written to output file
/* *inp first char of current token
/* *p first char not yet scanned
/*
/* macro expansion: write from *outp to *inp (chars waiting to be written),
/* ignore from *inp to *p (chars of the macro call), place generated
/* characters in front of *p (in reverse order), update pointers,
/* resume scanning.
/*
/* symbol table pointers point to just beyond the end of macro definitions;
/* the first preceding character is the number of formal parameters.
/* the appearance of a formal in the body of a definition is marked by
/* 2 chars: the char WARN, and a char containing the parameter number.
/* the first char of a definition is preceded by a zero character.
/*
/* when macro expansion attempts to back up over the beginning of the
/* buffer, some characters preceding *pend are saved in a side buffer,
/* the address of the side buffer is put on 'instack', and the rest
/* of the main buffer is moved to the right. the end of the saved buffer
/* is kept in 'endbuf' since there may be nulls in the saved buffer.
/*
/* similar action is taken when an 'include' statement is processed,
/* except that the main buffer must be completely emptied. the array
/* element 'inctop[ifno]' records the last side buffer saved when
/* file 'ifno' was included. these buffers remain dormant while
/* the file is being read, and are reactivated at end-of-file.
/*
/* instack[0 : mactop] holds the addresses of all pending side buffers.
/* instack[inctop[ifno]+1 : mactop-1] holds the addresses of the side
/* buffers which are "live"; the side buffers instack[0 : inctop[ifno]]
/* are dormant, waiting for end-of-file on the current file.
/*
/* space for side buffers is obtained from 'savch' and is never returned.
/* bufstack[0:fretop-1] holds addresses of side buffers which
/* are available for use.
*/
dump() {
/* write part of buffer which lies between outp and inp .
/* this should be a direct call to 'write', but the system slows to a crawl
/* if it has to do an unaligned copy. thus we buffer. this silly loop
/* is 15% of the total time, thus even the 'putc' macro is too slow.
*/
register char *p1,*p2; register FILE *f;
if ((p1=outp)==inp || flslvl!=0) return;
#if tgp
#define MAXOUT 80
if (!tgpscan) {/* scan again to insure <= MAXOUT chars between linefeeds */
register char c,*pblank; char savc,stopc,brk;
tgpscan=1; brk=stopc=pblank=0; p2=inp; savc= *p2; *p2='\0';
while (c= *p1++) {
if (c=='\\') c= *p1++;
if (stopc==c) stopc=0;
else if (c=='"' || c=='\'') stopc=c;
if (p1-outp>MAXOUT && pblank!=0) {
*pblank++='\n'; inp=pblank; dump(); brk=1; pblank=0;
}
if (c==' ' && stopc==0) pblank=p1-1;
}
if (brk) sayline();
*p2=savc; inp=p2; p1=outp; tgpscan=0;
}
#endif
f=fout;
# if gcos
/* filter out "$ program c" card if first line of input */
/* gmatch is a simple pattern matcher in the GCOS Standard Library */
{ static int gmfirst = 0;
if (!gmfirst) {
++gmfirst;
if (gmatch(p1, "^$*program[ \t]*c*"))
p1 = strdex(p1, '\n');
}
}
# endif
while (p1<inp) putc(*p1++,f);
outp=p1;
}
char *
refill(p) register char *p; {
/* dump buffer. save chars from inp to p. read into buffer at pbuf,
/* contiguous with p. update pointers, return new p.
*/
register char *np,*op; register int ninbuf;
dump(); np=pbuf-(p-inp); op=inp;
if (bob(np+1)) {pperror("token too long"); np=pbeg; p=inp+BUFSIZ;}
macdam += np-inp; outp=inp=np;
while (op<p) *np++= *op++;
p=np;
for (;;) {
if (mactop>inctop[ifno]) {/* retrieve hunk of pushed-back macro text */
op=instack[--mactop]; np=pbuf;
do {while (*np++= *op++);} while (op<endbuf[mactop]); pend=np-1;
/* make buffer space avail for 'include' processing */
if (fretop<MAXFRE) bufstack[fretop++]=instack[mactop];
return(p);
} else {/* get more text from file(s) */
maclvl=0;
if (0<(ninbuf=read(fin,pbuf,BUFSIZ))) {
pend=pbuf+ninbuf; *pend='\0';
return(p);
}
/* end of #include file */
if (ifno==0) {/* end of input */
if (plvl!=0) {
int n=plvl,tlin=lineno[ifno]; char *tfil=fnames[ifno];
lineno[ifno]=maclin; fnames[ifno]=macfil;
pperror("%s: unterminated macro call",macnam);
lineno[ifno]=tlin; fnames[ifno]=tfil;
np=p; *np++='\n'; /* shut off unterminated quoted string */
while (--n>=0) *np++=')'; /* supply missing parens */
pend=np; *np='\0'; if (plvl<0) plvl=0;
return(p);
}
inp=p; dump(); exit(exfail);
}
close(fin); fin=fins[--ifno]; dirs[0]=dirnams[ifno]; sayline();
}
}
}
#define BEG 0
#define LF 1
char *
cotoken(p) register char *p; {
register int c,i; char quoc;
static int state = BEG;
if (state!=BEG) goto prevlf;
for (;;) {
again:
while (!isspc(*p++));
switch (*(inp=p-1)) {
case 0: {
if (eob(--p)) {p=refill(p); goto again;}
else ++p; /* ignore null byte */
} break;
case '|': case '&': for (;;) {/* sloscan only */
if (*p++== *inp) break;
if (eob(--p)) p=refill(p);
else break;
} break;
case '=': case '!': for (;;) {/* sloscan only */
if (*p++=='=') break;
if (eob(--p)) p=refill(p);
else break;
} break;
case '<': case '>': for (;;) {/* sloscan only */
if (*p++=='=' || p[-2]==p[-1]) break;
if (eob(--p)) p=refill(p);
else break;
} break;
case '\\': for (;;) {
if (*p++=='\n') {++lineno[ifno]; break;}
if (eob(--p)) p=refill(p);
else {++p; break;}
} break;
case '/': for (;;) {
if (*p++=='*') {/* comment */
if (!passcom) {inp=p-2; dump(); ++flslvl;}
for (;;) {
while (!iscom(*p++));
if (p[-1]=='*') for (;;) {
if (*p++=='/') goto endcom;
if (eob(--p)) {
if (!passcom) {inp=p; p=refill(p);}
else if ((p-inp)>=BUFSIZ) {/* split long comment */
inp=p; p=refill(p); /* last char written is '*' */
putc('/',fout); /* terminate first part */
/* and fake start of 2nd */
outp=inp=p-=3; *p++='/'; *p++='*'; *p++='*';
} else p=refill(p);
} else break;
} else if (p[-1]=='\n') {
++lineno[ifno]; if (!passcom) putc('\n',fout);
} else if (eob(--p)) {
if (!passcom) {inp=p; p=refill(p);}
else if ((p-inp)>=BUFSIZ) {/* split long comment */
inp=p; p=refill(p);
putc('*',fout); putc('/',fout);
outp=inp=p-=2; *p++='/'; *p++='*';
} else p=refill(p);
} else ++p; /* ignore null byte */
}
endcom:
if (!passcom) {outp=inp=p; --flslvl; goto again;}
break;
}
if (eob(--p)) p=refill(p);
else break;
} break;
# if gcos
case '`':
# endif
case '"': case '\'': {
quoc=p[-1];
for (;;) {
while (!isquo(*p++));
if (p[-1]==quoc) break;
if (p[-1]=='\n') {--p; break;} /* bare \n terminates quotation */
if (p[-1]=='\\') for (;;) {
if (*p++=='\n') {++lineno[ifno]; break;} /* escaped \n ignored */
if (eob(--p)) p=refill(p);
else {++p; break;}
} else if (eob(--p)) p=refill(p);
else ++p; /* it was a different quote character */
}
} break;
case '\n': {
++lineno[ifno]; if (isslo) {state=LF; return(p);}
prevlf:
state=BEG;
for (;;) {
if (*p++=='#') return(p);
if (eob(inp= --p)) p=refill(p);
else goto again;
}
} break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
for (;;) {
while (isnum(*p++));
if (eob(--p)) p=refill(p);
else break;
} break;
case 'A': case 'B': case 'C': case 'D': case 'E':
case 'F': case 'G': case 'H': case 'I': case 'J':
case 'K': case 'L': case 'M': case 'N': case 'O':
case 'P': case 'Q': case 'R': case 'S': case 'T':
case 'U': case 'V': case 'W': case 'X': case 'Y':
case 'Z': case '_':
case 'a': case 'b': case 'c': case 'd': case 'e':
case 'f': case 'g': case 'h': case 'i': case 'j':
case 'k': case 'l': case 'm': case 'n': case 'o':
case 'p': case 'q': case 'r': case 's': case 't':
case 'u': case 'v': case 'w': case 'x': case 'y':
case 'z':
#if scw1
#define tmac1(c,bit) if (!xmac1(c,bit,&)) goto nomac
#define xmac1(c,bit,op) ((macbit+COFF)[c] op (bit))
#else
#define tmac1(c,bit)
#define xmac1(c,bit,op)
#endif
#if scw2
#define tmac2(c0,c1,cpos) if (!xmac2(c0,c1,cpos,&)) goto nomac
#define xmac2(c0,c1,cpos,op)\
((macbit+COFF)[(t21+COFF)[c0]+(t22+COFF)[c1]] op (t23+COFF+cpos)[c0])
#else
#define tmac2(c0,c1,cpos)
#define xmac2(c0,c1,cpos,op)
#endif
if (flslvl) goto nomac;
for (;;) {
c= p[-1]; tmac1(c,b0);
i= *p++; if (!isid(i)) goto endid; tmac1(i,b1); tmac2(c,i,0);
c= *p++; if (!isid(c)) goto endid; tmac1(c,b2); tmac2(i,c,1);
i= *p++; if (!isid(i)) goto endid; tmac1(i,b3); tmac2(c,i,2);
c= *p++; if (!isid(c)) goto endid; tmac1(c,b4); tmac2(i,c,3);
i= *p++; if (!isid(i)) goto endid; tmac1(i,b5); tmac2(c,i,4);
c= *p++; if (!isid(c)) goto endid; tmac1(c,b6); tmac2(i,c,5);
i= *p++; if (!isid(i)) goto endid; tmac1(i,b7); tmac2(c,i,6);
tmac2(i,0,7);
while (isid(*p++));
if (eob(--p)) {refill(p); p=inp+1; continue;}
goto lokid;
endid:
if (eob(--p)) {refill(p); p=inp+1; continue;}
tmac2(p[-1],0,-1+(p-inp));
lokid:
slookup(inp,p,0); if (newp) {p=newp; goto again;}
else break;
nomac:
while (isid(*p++));
if (eob(--p)) {p=refill(p); goto nomac;}
else break;
} break;
} /* end of switch */
if (isslo) return(p);
} /* end of infinite loop */
}
char *
skipbl(p) register char *p; {/* get next non-blank token */
do {outp=inp=p; p=cotoken(p);} while ((toktyp+COFF)[*inp]==BLANK);
return(p);
}
char *
unfill(p) register char *p; {
/* take <= BUFSIZ chars from right end of buffer and put them on instack .
/* slide rest of buffer to the right, update pointers, return new p.
*/
register char *np,*op; register int d;
if (mactop>=MAXFRE) {
pperror("%s: too much pushback",macnam);
p=inp=pend; dump(); /* begin flushing pushback */
while (mactop>inctop[ifno]) {p=refill(p); p=inp=pend; dump();}
}
if (fretop>0) np=bufstack[--fretop];
else {
np=savch; savch+=BUFSIZ;
if (savch>=sbf+SBSIZE) {pperror("no space"); exit(exfail);}
*savch++='\0';
}
instack[mactop]=np; op=pend-BUFSIZ; if (op<p) op=p;
for (;;) {while (*np++= *op++); if (eob(op)) break;} /* out with old */
endbuf[mactop++]=np; /* mark end of saved text */
np=pbuf+BUFSIZ; op=pend-BUFSIZ; pend=np; if (op<p) op=p;
while (outp<op) *--np= *--op; /* slide over new */
if (bob(np)) pperror("token too long");
d=np-outp; outp+=d; inp+=d; macdam+=d; return(p+d);
}
char *
doincl(p) register char *p; {
int filok,inctype;
register char *cp; char **dirp,*nfil; char filname[BUFSIZ];
p=skipbl(p); cp=filname;
if (*inp++=='<') {/* special <> syntax */
inctype=1;
for (;;) {
outp=inp=p; p=cotoken(p);
if (*inp=='\n') {--p; *cp='\0'; break;}
if (*inp=='>') { *cp='\0'; break;}
# ifdef gimpel
if (*inp=='.' && !intss()) *inp='#';
# endif
while (inp<p) *cp++= *inp++;
}
} else if (inp[-1]=='"') {/* regular "" syntax */
inctype=0;
# ifdef gimpel
while (inp<p) {if (*inp=='.' && !intss()) *inp='#'; *cp++= *inp++;}
# else
while (inp<p) *cp++= *inp++;
# endif
if (*--cp=='"') *cp='\0';
} else {pperror("bad include syntax",0); inctype=2;}
/* flush current file to \n , then write \n */
++flslvl; do {outp=inp=p; p=cotoken(p);} while (*inp!='\n'); --flslvl;
inp=p; dump(); if (inctype==2) return(p);
/* look for included file */
if (ifno+1 >=MAXINC) {
pperror("Unreasonable include nesting",0); return(p);
}
if((nfil=savch)>sbf+SBSIZE-BUFSIZ) {pperror("no space"); exit(exfail);}
filok=0;
for (dirp=dirs+inctype; *dirp; ++dirp) {
if (
# if gcos
strdex(filname, '/')
# else
filname[0]=='/'
# endif
|| **dirp=='\0') strcpy(nfil,filname);
else {
strcpy(nfil,*dirp);
# if unix || gcos
strcat(nfil,"/");
# endif
#ifdef ibm
#ifndef gimpel
strcat(nfil,".");
#endif
#endif
strcat(nfil,filname);
}
if (0<(fins[ifno+1]=open(nfil,READ))) {
filok=1; fin=fins[++ifno]; break;
}
}
if (filok==0) pperror("Can't find include file %s",filname);
else {
lineno[ifno]=1; fnames[ifno]=cp=nfil; while (*cp++); savch=cp;
dirnams[ifno]=dirs[0]=trmdir(copy(nfil));
sayline();
/* save current contents of buffer */
while (!eob(p)) p=unfill(p);
inctop[ifno]=mactop;
}
return(p);
}
equfrm(a,p1,p2) register char *a,*p1,*p2; {
register char c; int flag;
c= *p2; *p2='\0';
flag=strcmp(a,p1); *p2=c; return(flag==SAME);
}
char *
dodef(p) char *p; {/* process '#define' */
register char *pin,*psav,*cf;
char **pf,**qf; int b,c,params; struct symtab *np;
char *oldval,*oldsavch;
char *formal[MAXFRM]; /* formal[n] is name of nth formal */
char formtxt[BUFSIZ]; /* space for formal names */
if (savch>sbf+SBSIZE-BUFSIZ) {pperror("too much defining"); return(p);}
oldsavch=savch; /* to reclaim space if redefinition */
++flslvl; /* prevent macro expansion during 'define' */
p=skipbl(p); pin=inp;
if ((toktyp+COFF)[*pin]!=IDENT) {
ppwarn("illegal macro name"); while (*inp!='\n') p=skipbl(p); return(p);
}
np=slookup(pin,p,1);
if (oldval=np->value) savch=oldsavch; /* was previously defined */
b=1; cf=pin;
while (cf<p) {/* update macbit */
c= *cf++; xmac1(c,b,|=); b=(b+b)&0xFF;
if (cf!=p) xmac2(c,*cf,-1+(cf-pin),|=);
else xmac2(c,0,-1+(cf-pin),|=);
}
params=0; outp=inp=p; p=cotoken(p); pin=inp;
if (*pin=='(') {/* with parameters; identify the formals */
cf=formtxt; pf=formal;
for (;;) {
p=skipbl(p); pin=inp;
if (*pin=='\n') {
--lineno[ifno]; --p; pperror("%s: missing )",np->name); break;
}
if (*pin==')') break;
if (*pin==',') continue;
if ((toktyp+COFF)[*pin]!=IDENT) {
c= *p; *p='\0'; pperror("bad formal: %s",pin); *p=c;
} else if (pf>= &formal[MAXFRM]) {
c= *p; *p='\0'; pperror("too many formals: %s",pin); *p=c;
} else {
*pf++=cf; while (pin<p) *cf++= *pin++; *cf++='\0'; ++params;
}
}
if (params==0) --params; /* #define foo() ... */
} else if (*pin=='\n') {--lineno[ifno]; --p;}
/* remember beginning of macro body, so that we can
/* warn if a redefinition is different from old value.
*/
oldsavch=psav=savch;
for (;;) {/* accumulate definition until linefeed */
outp=inp=p; p=cotoken(p); pin=inp;
if (*pin=='\\' && pin[1]=='\n') continue; /* ignore escaped lf */
if (*pin=='\n') break;
if (params) {/* mark the appearance of formals in the definiton */
if ((toktyp+COFF)[*pin]==IDENT) {
for (qf=pf; --qf>=formal; ) {
if (equfrm(*qf,pin,p)) {
*psav++=qf-formal+1; *psav++=WARN; pin=p; break;
}
}
} else if (*pin=='"' || *pin=='\''
# if gcos
|| *pin=='`'
# endif
) {/* inside quotation marks, too */
char quoc= *pin;
for (*psav++= *pin++; pin<p && *pin!=quoc; ) {
while (pin<p && !isid(*pin)) *psav++= *pin++;
cf=pin; while (cf<p && isid(*cf)) ++cf;
for (qf=pf; --qf>=formal; ) {
if (equfrm(*qf,pin,cf)) {
*psav++=qf-formal+1; *psav++=WARN; pin=cf; break;
}
}
while (pin<cf) *psav++= *pin++;
}
}
}
while (pin<p) *psav++= *pin++;
}
*psav++=params; *psav++='\0';
if ((cf=oldval)!=NULL) {/* redefinition */
--cf; /* skip no. of params, which may be zero */
while (*--cf); /* go back to the beginning */
if (0!=strcmp(++cf,oldsavch)) {/* redefinition different from old */
--lineno[ifno]; ppwarn("%s redefined",np->name); ++lineno[ifno];
np->value=psav-1;
} else psav=oldsavch; /* identical redef.; reclaim space */
} else np->value=psav-1;
--flslvl; inp=pin; savch=psav; return(p);
}
#define fasscan() ptrtab=fastab+COFF
#define sloscan() ptrtab=slotab+COFF
char *
control(p) register char *p; {/* find and handle preprocessor control lines */
register struct symtab *np;
for (;;) {
fasscan(); p=cotoken(p); if (*inp=='\n') ++inp; dump();
sloscan(); p=skipbl(p);
*--inp=SALT; outp=inp; ++flslvl; np=slookup(inp,p,0); --flslvl;
if (np==defloc) {/* define */
if (flslvl==0) {p=dodef(p); continue;}
} else if (np==incloc) {/* include */
if (flslvl==0) {p=doincl(p); continue;}
} else if (np==ifnloc) {/* ifndef */
++flslvl; p=skipbl(p); np=slookup(inp,p,0); --flslvl;
if (flslvl==0 && np->value==0) ++trulvl;
else ++flslvl;
} else if (np==ifdloc) {/* ifdef */
++flslvl; p=skipbl(p); np=slookup(inp,p,0); --flslvl;
if (flslvl==0 && np->value!=0) ++trulvl;
else ++flslvl;
} else if (np==eifloc) {/* endif */
if (flslvl) {if (--flslvl==0) sayline();}
else if (trulvl) --trulvl;
else pperror("If-less endif",0);
} else if (np==elsloc) {/* else */
if (flslvl) {
if (--flslvl!=0) ++flslvl;
else {++trulvl; sayline();}
}
else if (trulvl) {++flslvl; --trulvl;}
else pperror("If-less else",0);
} else if (np==udfloc) {/* undefine */
if (flslvl==0) {
++flslvl; p=skipbl(p); slookup(inp,p,DROP); --flslvl;
}
} else if (np==ifloc) {/* if */
#if tgp
pperror(" IF not implemented, true assumed", 0);
if (flslvl==0) ++trulvl; else ++flslvl;
#else
newp=p;
if (flslvl==0 && yyparse()) ++trulvl; else ++flslvl;
p=newp;
#endif
} else if (np==lneloc) {/* line */
if (flslvl==0 && pflag==0) {
outp=inp=p; *--outp='#'; while (*inp!='\n') p=cotoken(p);
continue;
}
} else if (*++inp=='\n') outp=inp; /* allows blank line after # */
else pperror("undefined control",0);
/* flush to lf */
++flslvl; while (*inp!='\n') {outp=inp=p; p=cotoken(p);} --flslvl;
}
}
struct symtab *
stsym(s) register char *s; {
char buf[BUFSIZ]; register char *p;
/* make definition look exactly like end of #define line */
/* copy to avoid running off end of world when param list is at end */
p=buf; while (*p++= *s++);
p=buf; while (isid(*p++)); /* skip first identifier */
if (*--p=='=') {*p++=' '; while (*p++);}
else {s=" 1"; while (*p++= *s++);}
pend=p; *--p='\n';
sloscan(); dodef(buf); return(lastsym);
}
struct symtab *
ppsym(s) char *s; {/* kluge */
register struct symtab *sp;
cinit=SALT; *savch++=SALT; sp=stsym(s); --sp->name; cinit=0; return(sp);
}
/* VARARGS1 */
pperror(s,x,y) char *s; {
if (fnames[ifno][0]) fprintf(stderr,
# if gcos
"*%c* \"%s\", line ", exfail >= 0 ? 'F' : 'W',
# else
"%s: ",
# endif
fnames[ifno]);
fprintf(stderr, "%d: ",lineno[ifno]);
fprintf(stderr, s, x, y);
fprintf(stderr,"\n");
++exfail;
}
yyerror(s,a,b) char *s; {
pperror(s,a,b);
}
ppwarn(s,x) char *s; {
int fail = exfail;
exfail = -1;
pperror(s,x);
exfail = fail;
}
struct symtab *
lookup(namep, enterf)
char *namep;
{
register char *np, *snp;
register int c, i; int around;
register struct symtab *sp;
/* namep had better not be too long (currently, <=8 chars) */
np=namep; around=0; i=cinit;
while (c= *np++) i += i+c; c=i; /* c=i for register usage on pdp11 */
c %= symsiz; if (c<0) c += symsiz;
sp = &stab[c];
while (snp=sp->name) {
np = namep;
while (*snp++ == *np) if (*np++ == '\0') {
if (enterf==DROP) {sp->name[0]= DROP; sp->value=0;}
return(lastsym=sp);
}
if (--sp < &stab[0])
if (around) {pperror("too many defines", 0); exit(exfail);}
else {++around; sp = &stab[symsiz-1];}
}
if (enterf>0) sp->name=namep;
return(lastsym=sp);
}
struct symtab *
slookup(p1,p2,enterf) register char *p1,*p2; int enterf;{
register char *p3; char c2,c3; struct symtab *np;
c2= *p2; *p2='\0'; /* mark end of token */
if ((p2-p1)>8) p3=p1+8; else p3=p2;
c3= *p3; *p3='\0'; /* truncate to 8 chars or less */
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; struct symtab *sp; {
static char match[]="%s: argument mismatch";
register char *ca,*vp; int params;
char *actual[MAXFRM]; /* actual[n] is text of nth actual */
char acttxt[BUFSIZ]; /* space for actuals */
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); while (*inp=='\n'); /* skip \n too */
if (*inp=='(') {
maclin=lineno[ifno]; macfil=fnames[ifno];
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 *pa++=ca;
}
}
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);}
*--p= *ca;
}
} else 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 = savch; while (*savch++ = *s++);
return(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;
# 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] = "";
# 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 'P': pflag++;
case 'E': continue;
case 'R': ++rflag; continue;
case 'C': passcom++; 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':
if (nd>8) pperror("excessive -I file (%s) ignored",argv[i]);
else dirs[nd++] = argv[i]+2;
continue;
case '\0': continue;
default:
pperror("unknown flag %s", argv[i]);
continue;
}
default:
if (fin==STDIN) {
if (0>(fin=open(argv[i], READ))) {
pperror("No source file %s",argv[i]); exit(8);
}
fnames[ifno]=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) {
extern char _sobuf[BUFSIZ];
if (NULL==(fout=fopen(argv[i], "w"))) {
pperror("Can't create %s", argv[i]); exit(8);
} else {fclose(stdout); setbuf(fout,_sobuf);}
# endif
} else pperror("extraneous name %s", argv[i]);
}
}
fins[ifno]=fin;
exfail = 0;
/* after user -I files here are the standard include libraries */
# if unix
dirs[nd++] = "/usr/include";
# 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");
lneloc=ppsym("line");
for (i=sizeof(macbit)/sizeof(macbit[0]); --i>=0; ) macbit[i]=0;
# if unix
ysysloc=stsym("unix");
# 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
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);
}
fnames[ifno]=tf;
pbeg=buffer+8; pbuf=pbeg+BUFSIZ; pend=pbuf+BUFSIZ;
trulvl = 0; flslvl = 0;
lineno[0] = 1; sayline();
outp=inp=pend;
control(pend);
return (exfail);
}