NetBSD-5.0.2/usr.bin/m4/main.c
/* $NetBSD: main.c,v 1.37 2008/07/21 14:19:24 lukem Exp $ */
/* $OpenBSD: main.c,v 1.51 2001/10/06 10:52:25 espie 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. 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.
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
#if defined(__COPYRIGHT) && !defined(lint)
__COPYRIGHT("@(#) Copyright (c) 1989, 1993\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */
#if defined(__RCSID) && !defined(lint)
#if 0
static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: main.c,v 1.37 2008/07/21 14:19:24 lukem Exp $");
#endif
#endif /* not lint */
/*
* main.c
* Facility: m4 macro processor
* by: oz
*/
#include <sys/types.h>
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "mdef.h"
#include "stdd.h"
#include "extern.h"
#include "pathnames.h"
ndptr hashtab[HASHSIZE]; /* hash table for macros etc. */
stae *mstack; /* stack of m4 machine */
char *sstack; /* shadow stack, for string space extension */
static size_t STACKMAX; /* current maximum size of stack */
int sp; /* current m4 stack pointer */
int fp; /* m4 call frame pointer */
struct input_file infile[MAXINP];/* input file stack (0=stdin) */
FILE **outfile; /* diversion array(0=bitbucket)*/
int maxout;
FILE *active; /* active output file pointer */
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.. */
int m4prefix = 0; /* prefix keywords with m4_ */
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 | NOARGS },
{ "expr", EXPRTYPE },
{ "eval", EXPRTYPE },
{ "substr", SUBSTYPE },
{ "ifelse", IFELTYPE },
{ "ifdef", IFDFTYPE },
{ "len", LENGTYPE },
{ "incr", INCRTYPE },
{ "decr", DECRTYPE },
{ "dnl", DNLNTYPE | NOARGS },
{ "changequote", CHNQTYPE | NOARGS },
{ "changecom", CHNCTYPE | NOARGS },
{ "index", INDXTYPE },
#ifdef EXTENDED
{ "paste", PASTTYPE },
{ "spaste", SPASTYPE },
/* Newer extensions, needed to handle gnu-m4 scripts */
{ "indir", INDIRTYPE},
{ "builtin", BUILTINTYPE},
{ "patsubst", PATSTYPE},
{ "regexp", REGEXPTYPE},
{ "esyscmd", ESYSCMDTYPE},
{ "__file__", FILENAMETYPE | NOARGS},
{ "__line__", LINETYPE | NOARGS},
#endif
{ "popdef", POPDTYPE },
{ "pushdef", PUSDTYPE },
{ "dumpdef", DUMPTYPE | NOARGS },
{ "shift", SHIFTYPE | NOARGS },
{ "translit", TRNLTYPE },
{ "undefine", UNDFTYPE },
{ "undivert", UNDVTYPE | NOARGS },
{ "divnum", DIVNTYPE | NOARGS },
{ "maketemp", MKTMTYPE },
{ "errprint", ERRPTYPE | NOARGS },
{ "m4wrap", M4WRTYPE | NOARGS },
{ "m4exit", EXITTYPE | NOARGS },
{ "syscmd", SYSCTYPE },
{ "sysval", SYSVTYPE | NOARGS },
{ "traceon", TRACEONTYPE | NOARGS },
{ "traceoff", TRACEOFFTYPE | NOARGS },
#if defined(unix) || defined(__unix__)
{ "unix", SELFTYPE | NOARGS },
#else
#ifdef vms
{ "vms", SELFTYPE | NOARGS },
#endif
#endif
};
#define MAXKEYS (sizeof(keywrds)/sizeof(struct keyblk))
extern int optind;
extern char *optarg;
#define MAXRECORD 50
static struct position {
char *name;
unsigned long line;
} quotes[MAXRECORD], paren[MAXRECORD];
static void record __P((struct position *, int));
static void dump_stack __P((struct position *, int));
static void macro __P((void));
static void initkwds __P((void));
static ndptr inspect __P((int, char *));
static int do_look_ahead __P((int, const char *));
static void enlarge_stack __P((void));
int main __P((int, char *[]));
int
main(argc,argv)
int argc;
char *argv[];
{
int c;
int n;
char *p;
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, onintr);
/*
* We need to know if -P is there before checking -D and -U.
*/
while ((c = getopt(argc, argv, "D:I:PU:d:go:t:")) != -1)
if (c == 'P')
m4prefix = 1;
optind = 1;
initkwds();
initspaces();
STACKMAX = INITSTACKMAX;
mstack = (stae *)xalloc(sizeof(stae) * STACKMAX);
sstack = (char *)xalloc(STACKMAX);
maxout = 0;
outfile = NULL;
resizedivs(MAXOUT);
while ((c = getopt(argc, argv, "D:I:PU:d:go:t:")) != -1)
switch (c) {
case 'D': /* define something..*/
for (p = optarg; *p; p++)
if (*p == '=')
break;
if (*p)
*p++ = EOS;
dodefine(optarg, p);
break;
case 'I':
addtoincludepath(optarg);
break;
case 'P':
break;
case 'U': /* undefine... */
remhash(optarg, TOP);
break;
case 'd':
set_trace_flags(optarg);
break;
case 'g':
mimic_gnu = 1;
break;
case 'o':
trace_file(optarg);
break;
case 't':
mark_traced(optarg, 1);
break;
case '?':
default:
usage(argv[0]);
}
argc -= optind;
argv += optind;
active = stdout; /* default active output */
bbase[0] = bufbase;
if (!argc) {
sp = -1; /* stack pointer initialized */
fp = 0; /* frame pointer initialized */
set_input(infile+0, stdin, "stdin");
/* default input (naturally) */
macro();
} else
for (; argc--; ++argv) {
p = *argv;
if (p[0] == '-' && p[1] == EOS)
set_input(infile, stdin, "stdin");
else if (fopen_trypath(infile, p) == NULL)
err(1, "%s", p);
sp = -1;
fp = 0;
macro();
release_input(infile);
}
if (*m4wraps) { /* anything for rundown ?? */
ilevel = 0; /* in case m4wrap includes.. */
bufbase = bp = buf; /* use the entire buffer */
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]);
}
return 0;
}
/*
* Look ahead 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
*/
static int
do_look_ahead(t, token)
int t;
const char *token;
{
int i;
assert((unsigned char)t == (unsigned char)token[0]);
for (i = 1; *++token; i++) {
t = gpbc();
if (t == EOF || (unsigned char)t != (unsigned char)*token) {
putback(t);
while (--i)
putback(*--token);
return 0;
}
}
return 1;
}
#define LOOK_AHEAD(t, token) (t != EOF && \
(unsigned char)(t)==(unsigned char)(token)[0] && \
do_look_ahead(t,token))
/*
* macro - the work horse..
*/
static void
macro()
{
char token[MAXTOK+1];
int t, l;
ndptr p;
int nlpar;
l = 0; /* XXXGCC -Wuninitialized [sun2] */
cycle {
t = gpbc();
if (t == '_' || isalpha(t)) {
p = inspect(t, token);
if (p != nil)
putback(l = gpbc());
if (p == nil || (l != LPAREN &&
(p->type & NEEDARGS) != 0))
outputstr(token);
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:
*/
pushs1(p->defn); /* defn string */
pushs1(p->name); /* macro name */
pushs(ep); /* start next..*/
if (l != LPAREN && PARLEV == 0) {
/* no bracks */
chrsave(EOS);
if (sp == STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, 2,
CALTYP);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
}
} else if (t == EOF) {
if (sp > -1) {
warnx( "unexpected end of input, unclosed parenthesis:");
dump_stack(paren, PARLEV);
exit(1);
}
if (ilevel <= 0)
break; /* all done thanks.. */
release_input(infile+ilevel--);
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 = 0;
record(quotes, nlpar++);
/*
* Opening quote: scan forward until matching
* closing quote has been found.
*/
do {
l = gpbc();
if (LOOK_AHEAD(l,rquote)) {
if (--nlpar > 0)
outputstr(rquote);
} else if (LOOK_AHEAD(l,lquote)) {
record(quotes, nlpar++);
outputstr(lquote);
} else if (l == EOF) {
if (nlpar == 1)
warnx("unclosed quote:");
else
warnx("%d unclosed quotes:", nlpar);
dump_stack(quotes, nlpar);
exit(1);
} else {
if (nlpar > 0) {
if (sp < 0)
putc(l, active);
else
CHRSAVE(l);
}
}
}
while (nlpar != 0);
}
else if (sp < 0 && LOOK_AHEAD(t, scommt)) {
fputs(scommt, active);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
fputs(ecommt, 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);
record(paren, PARLEV++);
break;
case RPAREN:
if (--PARLEV > 0)
chrsave(t);
else { /* end of argument list */
chrsave(EOS);
if (sp == STACKMAX)
errx(1, "internal stack overflow");
eval((const 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:
if (LOOK_AHEAD(t, scommt)) {
char *p;
for (p = scommt; *p; p++)
chrsave(*p);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
for (p = ecommt; *p; p++)
chrsave(*p);
break;
}
if (t == EOF)
break;
CHRSAVE(t);
}
} else
CHRSAVE(t); /* stack the char */
break;
}
}
}
/*
* output string directly, without pushing it for reparses.
*/
void
outputstr(s)
const char *s;
{
if (sp < 0)
while (*s)
putc(*s++, active);
else
while (*s)
CHRSAVE(*s++);
}
/*
* build an input token..
* consider only those starting with _ or A-Za-z. This is a
* combo with lookup to speed things up.
*/
static ndptr
inspect(c, tp)
int c;
char *tp;
{
char *name = tp;
char *etp = tp+MAXTOK;
ndptr p;
unsigned int h;
h = *tp++ = c;
while ((isalnum(c = gpbc()) || c == '_') && tp < etp)
h = (h << 5) + h + (*tp++ = c);
if (c != EOF)
PUTBACK(c);
*tp = EOS;
/* token is too long, it won't match anything, but it can still
* be output. */
if (tp == ep) {
outputstr(name);
while (isalnum(c = gpbc()) || c == '_') {
if (sp < 0)
putc(c, active);
else
CHRSAVE(c);
}
*name = EOS;
return nil;
}
for (p = hashtab[h % HASHSIZE]; p != nil; p = p->nxtptr)
if (h == p->hv && 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.
*/
static void
initkwds()
{
size_t i;
unsigned int h;
ndptr p;
char *k;
for (i = 0; i < MAXKEYS; i++) {
k = (char *)keywrds[i].knam;
if (m4prefix) {
size_t klen = strlen(k);
char *newk = malloc(klen + 4);
if (snprintf(newk, klen+4, "m4_%s", k) == -1)
err(1, "snprintf");
keywrds[i].knam = newk;
k = newk;
}
h = hash(k);
p = (ndptr) xalloc(sizeof(struct ndblock));
p->nxtptr = hashtab[h % HASHSIZE];
hashtab[h % HASHSIZE] = p;
p->name = xstrdup(keywrds[i].knam);
p->defn = null;
p->hv = h;
p->type = keywrds[i].ktyp & TYPEMASK;
if ((keywrds[i].ktyp & NOARGS) == 0)
p->type |= NEEDARGS;
}
}
/* Look up a builtin type, even if overridden by the user */
int
builtin_type(key)
const char *key;
{
int i;
for (i = 0; i != MAXKEYS; i++)
if (STREQ(keywrds[i].knam, key))
return keywrds[i].ktyp;
return -1;
}
const char *
builtin_realname(n)
int n;
{
int i;
for (i = 0; i != MAXKEYS; i++)
if (((keywrds[i].ktyp ^ n) & TYPEMASK) == 0)
return keywrds[i].knam;
return NULL;
}
static void
record(t, lev)
struct position *t;
int lev;
{
if (lev < MAXRECORD) {
t[lev].name = CURRENT_NAME;
t[lev].line = CURRENT_LINE;
}
}
static void
dump_stack(t, lev)
struct position *t;
int lev;
{
int i;
for (i = 0; i < lev; i++) {
if (i == MAXRECORD) {
fprintf(stderr, " ...\n");
break;
}
fprintf(stderr, " %s at line %lu\n",
t[i].name, t[i].line);
}
}
static void
enlarge_stack()
{
STACKMAX *= 2;
mstack = realloc(mstack, sizeof(stae) * STACKMAX);
sstack = realloc(sstack, STACKMAX);
if (mstack == NULL || sstack == NULL)
errx(1, "Evaluation stack overflow (%lu)",
(unsigned long)STACKMAX);
}