ref: 61f4c085c402af665b436f6d010d61107551d8a3
dir: /sys/src/cmd/lex/lmain.c/
/* lex [-[dynvt]] [file] ... [file] */
/* Copyright 1976, Bell Telephone Laboratories, Inc.,
written by Eric Schmidt, August 27, 1976 */
# include "ldefs.h"
Biobuf fout;
int foutopen;
int errorf = 1;
int sect = DEFSECTION;
int prev = '\n'; /* previous input character */
int pres = '\n'; /* present input character */
int peek = '\n'; /* next input character */
uchar *pushptr = pushc;
uchar *slptr = slist;
char *cname = "/sys/lib/lex/ncform";
int nine;
int ccount = 1;
int casecount = 1;
int aptr = 1;
int nstates = NSTATES, maxpos = MAXPOS;
int treesize = TREESIZE, ntrans = NTRANS;
int yytop;
int outsize = NOUTPUT;
int sptr = 1;
int report = 2;
int debug; /* 1 = on */
int charc;
int sargc;
char **sargv;
uchar buf[520];
int yyline; /* line number of file */
char *yyfile; /* filename for error messages */
int eof;
int lgatflg;
int divflg;
int funcflag;
int pflag;
int chset; /* 1 = char set modified */
Biobuf *fin = 0, *fother;
int fptr;
int *name;
int *left;
int *right;
int *parent;
uchar *nullstr;
uchar **ptr;
int tptr;
uchar pushc[TOKENSIZE];
uchar slist[STARTSIZE];
uchar **def, **subs, *dchar;
uchar **sname, *stchar;
uchar *ccl;
uchar *ccptr;
uchar *dp, *sp;
int dptr;
uchar *bptr; /* store input position */
uchar *tmpstat;
int count;
int **foll;
int *nxtpos;
int *positions;
int *gotof;
int *nexts;
uchar *nchar;
int **state;
int *sfall; /* fallback state num */
uchar *cpackflg; /* true if state has been character packed */
int *atable;
int nptr;
uchar symbol[NCH];
uchar cindex[NCH];
int xstate;
int stnum;
uchar match[NCH];
uchar extra[NACTIONS];
uchar *pchar, *pcptr;
int pchlen = TOKENSIZE;
long rcount;
int *verify, *advance, *stoff;
int scon;
uchar *psave;
static void free1core(void);
static void free2core(void);
static void free3core(void);
static void get1core(void);
static void get2core(void);
static void get3core(void);
void
main(int argc, char **argv)
{
int i;
ARGBEGIN {
# ifdef DEBUG
case 'd': debug++; break;
case 'y': yydebug = TRUE; break;
# endif
case 't': case 'T':
Binit(&fout, 1, OWRITE);
errorf= 2;
foutopen = 1;
break;
case 'v': case 'V':
report = 1;
break;
case 'n': case 'N':
report = 0;
break;
case '9':
nine = 1;
break;
default:
warning("Unknown option %c", ARGC());
} ARGEND
sargc = argc;
sargv = argv;
if (argc > 0){
yyfile = argv[fptr++];
fin = Bopen(yyfile, OREAD);
if(fin == 0)
error ("%s - can't open file: %r", yyfile);
sargc--;
sargv++;
}
else {
yyfile = "/fd/0";
fin = myalloc(sizeof(Biobuf), 1);
if(fin == 0)
exits("core");
Binit(fin, 0, OREAD);
}
if(Bgetc(fin) == Beof) /* no input */
exits(0);
Bseek(fin, 0, 0);
gch();
/* may be gotten: def, subs, sname, stchar, ccl, dchar */
get1core();
/* may be gotten: name, left, right, nullstr, parent, ptr */
strcpy((char*)sp, "INITIAL");
sname[0] = sp;
sp += strlen("INITIAL") + 1;
sname[1] = 0;
if(yyparse()) exits("error"); /* error return code */
/* may be disposed of: def, subs, dchar */
free1core();
/* may be gotten: tmpstat, foll, positions, gotof, nexts, nchar, state, atable, sfall, cpackflg */
get2core();
ptail();
mkmatch();
# ifdef DEBUG
if(debug) pccl();
# endif
sect = ENDSECTION;
if(tptr>0)cfoll(tptr-1);
# ifdef DEBUG
if(debug)pfoll();
# endif
cgoto();
# ifdef DEBUG
if(debug){
print("Print %d states:\n",stnum+1);
for(i=0;i<=stnum;i++)stprt(i);
}
# endif
/* may be disposed of: positions, tmpstat, foll, state, name, left, right, parent, ccl, stchar, sname */
/* may be gotten: verify, advance, stoff */
free2core();
get3core();
layout();
/* may be disposed of: verify, advance, stoff, nexts, nchar,
gotof, atable, ccpackflg, sfall */
# ifdef DEBUG
free3core();
# endif
fother = Bopen(cname,OREAD);
if(fother == 0)
error("Lex driver missing, file %s: %r",cname);
while ( (i=Bgetc(fother)) != Beof)
Bputc(&fout, i);
Bterm(fother);
Bterm(&fout);
if(
# ifdef DEBUG
debug ||
# endif
report == 1)statistics();
if (fin)
Bterm(fin);
exits(0); /* success return code */
}
static void
get1core(void)
{
ccptr = ccl = myalloc(CCLSIZE,sizeof(*ccl));
pcptr = pchar = myalloc(pchlen, sizeof(*pchar));
def = myalloc(DEFSIZE,sizeof(*def));
subs = myalloc(DEFSIZE,sizeof(*subs));
dp = dchar = myalloc(DEFCHAR,sizeof(*dchar));
sname = myalloc(STARTSIZE,sizeof(*sname));
sp = stchar = myalloc(STARTCHAR,sizeof(*stchar));
if(ccl == 0 || def == 0 || subs == 0 || dchar == 0 || sname == 0 || stchar == 0)
error("Too little core to begin");
}
static void
free1core(void)
{
free(def);
free(subs);
free(dchar);
}
static void
get2core(void)
{
int i;
gotof = myalloc(nstates,sizeof(*gotof));
nexts = myalloc(ntrans,sizeof(*nexts));
nchar = myalloc(ntrans,sizeof(*nchar));
state = myalloc(nstates,sizeof(*state));
atable = myalloc(nstates,sizeof(*atable));
sfall = myalloc(nstates,sizeof(*sfall));
cpackflg = myalloc(nstates,sizeof(*cpackflg));
tmpstat = myalloc(tptr+1,sizeof(*tmpstat));
foll = myalloc(tptr+1,sizeof(*foll));
nxtpos = positions = myalloc(maxpos,sizeof(*positions));
if(tmpstat == 0 || foll == 0 || positions == 0 ||
gotof == 0 || nexts == 0 || nchar == 0 || state == 0 || atable == 0 || sfall == 0 || cpackflg == 0 )
error("Too little core for state generation");
for(i=0;i<=tptr;i++)foll[i] = 0;
}
static void
free2core(void)
{
free(positions);
free(tmpstat);
free(foll);
free(name);
free(left);
free(right);
free(parent);
free(nullstr);
free(ptr);
free(state);
free(sname);
free(stchar);
free(ccl);
}
static void
get3core(void)
{
verify = myalloc(outsize,sizeof(*verify));
advance = myalloc(outsize,sizeof(*advance));
stoff = myalloc(stnum+2,sizeof(*stoff));
if(verify == 0 || advance == 0 || stoff == 0)
error("Too little core for final packing");
}
# ifdef DEBUG
static void
free3core(void){
free(advance);
free(verify);
free(stoff);
free(gotof);
free(nexts);
free(nchar);
free(atable);
free(sfall);
free(cpackflg);
}
# endif
void *
myalloc(int a, int b)
{
void *i;
i = calloc(a, b);
if(i==0)
warning("OOPS - calloc returns a 0");
return(i);
}
void
yyerror(char *s)
{
fprint(2, "%s:%d %s\n", yyfile, yyline, s);
}