NetBSD/usr.bin/m4/main.c

491 lines
12 KiB
C

/* $NetBSD: main.c,v 1.14 1997/12/02 22:34:02 cgd Exp $ */
/*-
* 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: main.c,v 1.14 1997/12/02 22:34:02 cgd Exp $");
#endif
#endif /* not lint */
/*
* main.c
* Facility: m4 macro processor
* by: oz
*/
#include <sys/types.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "mdef.h"
#include "stdd.h"
#include "extern.h"
#include "pathnames.h"
ndptr hashtab[HASHSIZE]; /* hash table for macros etc. */
pbent buf[BUFSIZE]; /* push-back buffer */
pbent *bufbase = buf; /* the base for current ilevel */
pbent *bbase[MAXINP]; /* the base for each ilevel */
pbent *bp = buf; /* first available character */
pbent *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[MAXCCHARS+1] = {LQUOTE}; /* left quote character (`) */
char rquote[MAXCCHARS+1] = {RQUOTE}; /* right quote character (') */
char scommt[MAXCCHARS+1] = {SCOMMT}; /* start character for comment */
char ecommt[MAXCCHARS+1] = {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 },
#if defined(unix) || defined(__NetBSD__)
{ "unix", MACRTYPE },
#else
#ifdef vms
{ "vms", MACRTYPE },
#endif
#endif
};
#define MAXKEYS (sizeof(keywrds)/sizeof(struct keyblk))
int do_look_ahead __P((int, char *));
ndptr inspect __P((char *));
void initkwds __P((void));
void macro __P((void));
int main __P((int, char **));
int
main(argc,argv)
int argc;
char *argv[];
{
int c;
int n;
char *p;
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:")) != -1)
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)
err(1, "%s", p);
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;
}
/*
* Look ahead (at most MAXCCHARS characters) for `token'.
* (on input `t == token[0]')
* Used for comment and quoting delimiters.
* Returns 1 if `token' present; copied to output.
* 0 if `token' not found; all characters pushed back
*/
int
do_look_ahead(t, token)
int t;
char *token;
{
int i;
if (t != token[0])
errx(1, "internal error");
for (i = 1; *++token; i++) {
t = gpbc();
if (t == EOF || t != *token) {
if (t != EOF)
putback(t);
while (--i)
putback(*--token);
return 0;
}
}
return 1;
}
#define LOOK_AHEAD(t, token) ((t)==(token)[0] && do_look_ahead(t,token))
/*
* macro - the work horse..
*/
void
macro()
{
char token[MAXTOK], chars[2];
char *s;
int t, l;
ndptr p;
int nlpar;
s = NULL;
cycle {
t = gpbc();
if (t == '_' || 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)
errx(1, "unexpected end of input");
if (ilevel <= 0)
break; /* all done thanks.. */
--ilevel;
(void) fclose(infile[ilevel+1]);
bufbase = bbase[ilevel];
continue;
}
/*
* non-alpha token possibly seen..
* [the order of else if .. stmts is important.]
*/
else if (LOOK_AHEAD(t,lquote)) { /* strip quotes */
nlpar = 1;
do {
l = gpbc();
if (LOOK_AHEAD(l,rquote)) {
nlpar--;
s = rquote;
} else if (LOOK_AHEAD(l,lquote)) {
nlpar++;
s = lquote;
} else if (l == EOF)
errx(1, "missing right quote");
else {
chars[0] = l;
chars[1] = '\0';
s = chars;
}
if (nlpar > 0) {
if (sp < 0)
while (*s)
putc(*s++, active);
else
while (*s)
chrsave(*s++);
}
}
while (nlpar != 0);
}
else if (sp < 0 && LOOK_AHEAD(t, scommt)) {
int i;
for (i = 0; i < MAXCCHARS && scommt[i]; i++)
putc(scommt[i], active);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
for (i = 0; i < MAXCCHARS && ecommt[i];
i++)
putc(ecommt[i], active);
break;
}
if (t == EOF)
break;
putc(t, active);
}
}
else if (sp < 0) { /* not in a macro at all */
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)
errx(1, "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)
char *tp;
{
char c;
char *name = tp;
char *etp = tp+MAXTOK;
ndptr p;
unsigned long h = 0;
while ((isalnum(c = gpbc()) || c == '_') && tp < etp)
h = (h << 5) + h + (*tp++ = c);
putback(c);
if (tp == etp)
errx(1, "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()
{
int i;
int h;
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;
}
}