4.4BSD/usr/src/usr.bin/m4/main.c
/*-
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Ozan Yigit at York University.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
/*
* main.c
* Facility: m4 macro processor
* by: oz
*/
#include <sys/types.h>
#include <signal.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include "mdef.h"
#include "stdd.h"
#include "extern.h"
#include "pathnames.h"
ndptr hashtab[HASHSIZE]; /* hash table for macros etc. */
char buf[BUFSIZE]; /* push-back buffer */
char *bufbase = buf; /* the base for current ilevel */
char *bbase[MAXINP]; /* the base for each ilevel */
char *bp = buf; /* first available character */
char *endpbb = buf+BUFSIZE; /* end of push-back buffer */
stae mstack[STACKMAX+1]; /* stack of m4 machine */
char strspace[STRSPMAX+1]; /* string space for evaluation */
char *ep = strspace; /* first free char in strspace */
char *endest= strspace+STRSPMAX;/* end of string space */
int sp; /* current m4 stack pointer */
int fp; /* m4 call frame pointer */
FILE *infile[MAXINP]; /* input file stack (0=stdin) */
FILE *outfile[MAXOUT]; /* diversion array(0=bitbucket)*/
FILE *active; /* active output file pointer */
char *m4temp; /* filename for diversions */
int ilevel = 0; /* input file stack pointer */
int oindex = 0; /* diversion index.. */
char *null = ""; /* as it says.. just a null.. */
char *m4wraps = ""; /* m4wrap string default.. */
char *progname; /* name of this program */
char lquote = LQUOTE; /* left quote character (`) */
char rquote = RQUOTE; /* right quote character (') */
char scommt = SCOMMT; /* start character for comment */
char ecommt = ECOMMT; /* end character for comment */
struct keyblk keywrds[] = { /* m4 keywords to be installed */
"include", INCLTYPE,
"sinclude", SINCTYPE,
"define", DEFITYPE,
"defn", DEFNTYPE,
"divert", DIVRTYPE,
"expr", EXPRTYPE,
"eval", EXPRTYPE,
"substr", SUBSTYPE,
"ifelse", IFELTYPE,
"ifdef", IFDFTYPE,
"len", LENGTYPE,
"incr", INCRTYPE,
"decr", DECRTYPE,
"dnl", DNLNTYPE,
"changequote", CHNQTYPE,
"changecom", CHNCTYPE,
"index", INDXTYPE,
#ifdef EXTENDED
"paste", PASTTYPE,
"spaste", SPASTYPE,
#endif
"popdef", POPDTYPE,
"pushdef", PUSDTYPE,
"dumpdef", DUMPTYPE,
"shift", SHIFTYPE,
"translit", TRNLTYPE,
"undefine", UNDFTYPE,
"undivert", UNDVTYPE,
"divnum", DIVNTYPE,
"maketemp", MKTMTYPE,
"errprint", ERRPTYPE,
"m4wrap", M4WRTYPE,
"m4exit", EXITTYPE,
"syscmd", SYSCTYPE,
"sysval", SYSVTYPE,
#ifdef unix
"unix", MACRTYPE,
#else
#ifdef vms
"vms", MACRTYPE,
#endif
#endif
};
#define MAXKEYS (sizeof(keywrds)/sizeof(struct keyblk))
extern int optind;
extern char *optarg;
void macro();
void initkwds();
extern int getopt();
int
main(argc,argv)
int argc;
char *argv[];
{
register int c;
register int n;
char *p;
register FILE *ifp;
progname = basename(argv[0]);
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, onintr);
initkwds();
while ((c = getopt(argc, argv, "tD:U:o:")) != EOF)
switch(c) {
case 'D': /* define something..*/
for (p = optarg; *p; p++)
if (*p == '=')
break;
if (*p)
*p++ = EOS;
dodefine(optarg, p);
break;
case 'U': /* undefine... */
remhash(optarg, TOP);
break;
case 'o': /* specific output */
case '?':
usage();
}
argc -= optind;
argv += optind;
active = stdout; /* default active output */
/* filename for diversions */
m4temp = mktemp(xstrdup(_PATH_DIVNAME));
bbase[0] = bufbase;
if (!argc) {
sp = -1; /* stack pointer initialized */
fp = 0; /* frame pointer initialized */
infile[0] = stdin; /* default input (naturally) */
macro();
} else
for (; argc--; ++argv) {
p = *argv;
if (p[0] == '-' && p[1] == '\0')
ifp = stdin;
else if ((ifp = fopen(p, "r")) == NULL)
oops("%s: %s", p, strerror(errno));
sp = -1;
fp = 0;
infile[0] = ifp;
macro();
if (ifp != stdin)
(void)fclose(ifp);
}
if (*m4wraps) { /* anything for rundown ?? */
ilevel = 0; /* in case m4wrap includes.. */
bufbase = bp = buf; /* use the entire buffer */
putback(EOF); /* eof is a must !! */
pbstr(m4wraps); /* user-defined wrapup act */
macro(); /* last will and testament */
}
if (active != stdout)
active = stdout; /* reset output just in case */
for (n = 1; n < MAXOUT; n++) /* default wrap-up: undivert */
if (outfile[n] != NULL)
getdiv(n);
/* remove bitbucket if used */
if (outfile[0] != NULL) {
(void) fclose(outfile[0]);
m4temp[UNIQUE] = '0';
#ifdef vms
(void) remove(m4temp);
#else
(void) unlink(m4temp);
#endif
}
return 0;
}
ndptr inspect();
/*
* macro - the work horse..
*/
void
macro() {
char token[MAXTOK];
register char *s;
register int t, l;
register ndptr p;
register int nlpar;
cycle {
if ((t = gpbc()) == '_' || isalpha(t)) {
putback(t);
if ((p = inspect(s = token)) == nil) {
if (sp < 0)
while (*s)
putc(*s++, active);
else
while (*s)
chrsave(*s++);
}
else {
/*
* real thing.. First build a call frame:
*/
pushf(fp); /* previous call frm */
pushf(p->type); /* type of the call */
pushf(0); /* parenthesis level */
fp = sp; /* new frame pointer */
/*
* now push the string arguments:
*/
pushs(p->defn); /* defn string */
pushs(p->name); /* macro name */
pushs(ep); /* start next..*/
putback(l = gpbc());
if (l != LPAREN) { /* add bracks */
putback(RPAREN);
putback(LPAREN);
}
}
}
else if (t == EOF) {
if (sp > -1)
oops("unexpected end of input", "");
if (ilevel <= 0)
break; /* all done thanks.. */
--ilevel;
(void) fclose(infile[ilevel+1]);
bufbase = bbase[ilevel];
continue;
}
/*
* non-alpha single-char token seen..
* [the order of else if .. stmts is important.]
*/
else if (t == lquote) { /* strip quotes */
nlpar = 1;
do {
if ((l = gpbc()) == rquote)
nlpar--;
else if (l == lquote)
nlpar++;
else if (l == EOF)
oops("missing right quote", "");
if (nlpar > 0) {
if (sp < 0)
putc(l, active);
else
chrsave(l);
}
}
while (nlpar != 0);
}
else if (sp < 0) { /* not in a macro at all */
if (t == scommt) { /* comment handling here */
putc(t, active);
while ((t = gpbc()) != ecommt)
putc(t, active);
}
putc(t, active); /* output directly.. */
}
else switch(t) {
case LPAREN:
if (PARLEV > 0)
chrsave(t);
while (isspace(l = gpbc()))
; /* skip blank, tab, nl.. */
putback(l);
PARLEV++;
break;
case RPAREN:
if (--PARLEV > 0)
chrsave(t);
else { /* end of argument list */
chrsave(EOS);
if (sp == STACKMAX)
oops("internal stack overflow", "");
if (CALTYP == MACRTYPE)
expand((char **) mstack+fp+1, sp-fp);
else
eval((char **) mstack+fp+1, sp-fp, CALTYP);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
break;
case COMMA:
if (PARLEV == 1) {
chrsave(EOS); /* new argument */
while (isspace(l = gpbc()))
;
putback(l);
pushs(ep);
} else
chrsave(t);
break;
default:
chrsave(t); /* stack the char */
break;
}
}
}
/*
* build an input token..
* consider only those starting with _ or A-Za-z. This is a
* combo with lookup to speed things up.
*/
ndptr
inspect(tp)
register char *tp;
{
register char c;
register char *name = tp;
register char *etp = tp+MAXTOK;
register ndptr p;
register unsigned long h = 0;
while ((isalnum(c = gpbc()) || c == '_') && tp < etp)
h = (h << 5) + h + (*tp++ = c);
putback(c);
if (tp == etp)
oops("token too long", "");
*tp = EOS;
for (p = hashtab[h%HASHSIZE]; p != nil; p = p->nxtptr)
if (STREQ(name, p->name))
break;
return p;
}
/*
* initkwds - initialise m4 keywords as fast as possible.
* This very similar to install, but without certain overheads,
* such as calling lookup. Malloc is not used for storing the
* keyword strings, since we simply use the static pointers
* within keywrds block.
*/
void
initkwds() {
register int i;
register int h;
register ndptr p;
for (i = 0; i < MAXKEYS; i++) {
h = hash(keywrds[i].knam);
p = (ndptr) xalloc(sizeof(struct ndblock));
p->nxtptr = hashtab[h];
hashtab[h] = p;
p->name = keywrds[i].knam;
p->defn = null;
p->type = keywrds[i].ktyp | STATIC;
}
}