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NetBSD/usr.bin/m4/main.c
christos a687207309 Explain what REDIRECT is for.
2016-01-23 14:24:43 +00:00

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/* $OpenBSD: main.c,v 1.77 2009/10/14 17:19:47 sthen Exp $ */
/* $NetBSD: main.c,v 1.46 2016/01/23 14:24:43 christos 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.
*/
/*
* main.c
* Facility: m4 macro processor
* by: oz
*/
#if HAVE_NBTOOL_CONFIG_H
#include "nbtool_config.h"
#endif
#include <sys/cdefs.h>
__RCSID("$NetBSD: main.c,v 1.46 2016/01/23 14:24:43 christos Exp $");
#include <assert.h>
#include <signal.h>
#include <getopt.h>
#include <err.h>
#include <errno.h>
#include <unistd.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>
#include <ohash.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.. */
const char *null = ""; /* as it says.. just a null.. */
char **m4wraps = NULL; /* m4wraps array. */
int maxwraps = 0; /* size of m4wraps array */
int wrapindex = 0; /* current offset in m4wraps */
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 */
int synch_lines = 0; /* line synchronisation for C preprocessor */
int prefix_builtins = 0; /* -P option to prefix builtin keywords */
int fatal_warnings = 0; /* -E option to exit on warnings */
int quiet = 0; /* -Q option to silence warnings */
int nesting_limit = -1; /* -L for nesting limit */
const char *freeze = NULL; /* -F to freeze state */
const char *reload = NULL; /* -R to reload state */
#ifndef REAL_FREEZE
FILE *freezef = NULL;
int thawing = 0;
#endif
struct keyblk {
const char *knam; /* keyword name */
int ktyp; /* keyword type */
};
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))
#define MAXRECORD 50
static struct position {
char *name;
unsigned long line;
} quotes[MAXRECORD], paren[MAXRECORD];
static void record(struct position *, int);
static void dump_stack(struct position *, int);
static void macro(void);
static void initkwds(void);
static ndptr inspect(int, char *);
static int do_look_ahead(int, const char *);
static void reallyoutputstr(const char *);
static void reallyputchar(int);
static void enlarge_stack(void);
static void help(void);
static void
usage(FILE *f)
{
fprintf(f, "Usage: %s [-EGgiPQsv] [-Dname[=value]] [-d flags] "
"[-I dirname] [-o filename] [-L limit]\n"
"\t[-t macro] [-Uname] [file ...]\n", getprogname());
}
__dead static void
onintr(int signo)
{
char intrmessage[] = "m4: interrupted.\n";
write(STDERR_FILENO, intrmessage, sizeof(intrmessage)-1);
_exit(1);
}
#define OPT_HELP 1
struct option longopts[] = {
{ "debug", optional_argument, 0, 'd' },
{ "define", required_argument, 0, 'D' },
{ "error-output", required_argument, 0, 'e' },
{ "fatal-warnings", no_argument, 0, 'E' },
{ "freeze-state", required_argument, 0, 'F' },
{ "gnu", no_argument, 0, 'g' },
{ "help", no_argument, 0, OPT_HELP },
{ "include", required_argument, 0, 'I' },
{ "interactive", no_argument, 0, 'i' },
{ "nesting-limit", required_argument, 0, 'L' },
{ "prefix-builtins", no_argument, 0, 'P' },
{ "quiet", no_argument, 0, 'Q' },
{ "reload-state", required_argument, 0, 'R' },
{ "silent", no_argument, 0, 'Q' },
{ "synclines", no_argument, 0, 's' },
{ "trace", required_argument, 0, 't' },
{ "traditional", no_argument, 0, 'G' },
{ "undefine", required_argument, 0, 'U' },
{ "version", no_argument, 0, 'v' },
#ifdef notyet
{ "arglength", required_argument, 0, 'l' },
{ "debugfile", optional_argument, 0, OPT_DEBUGFILE },
{ "hashsize", required_argument, 0, 'H' },
{ "warn-macro-sequence",optional_argument, 0, OPT_WARN_SEQUENCE },
#endif
{ 0, 0, 0, 0 },
};
int
main(int argc, char *argv[])
{
int c;
int n;
char *p;
setprogname(argv[0]);
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, onintr);
init_macros();
initspaces();
STACKMAX = INITSTACKMAX;
mstack = (stae *)xalloc(sizeof(stae) * STACKMAX, NULL);
sstack = (char *)xalloc(STACKMAX, NULL);
maxout = 0;
outfile = NULL;
resizedivs(MAXOUT);
while ((c = getopt_long(argc, argv, "D:d:e:EF:GgI:iL:o:PR:Qst:U:v",
longopts, NULL)) != -1)
switch(c) {
case 'D': /* define something..*/
for (p = optarg; *p; p++)
if (*p == '=')
break;
if (*p)
*p++ = EOS;
dodefine(optarg, p);
break;
case 'd':
set_trace_flags(optarg);
break;
case 'E':
fatal_warnings++;
break;
case 'e':
if (freopen(optarg, "w+", stderr) == NULL)
err(EXIT_FAILURE, "Can't redirect errors to `%s'",
optarg);
break;
case 'F':
freeze = optarg;
#ifndef REAL_FREEZE
if ((freezef = fopen(freeze, "w")) == NULL)
err(EXIT_FAILURE, "Can't open `%s'", freeze);
#endif
break;
case 'I':
addtoincludepath(optarg);
break;
case 'i':
setvbuf(stdout, NULL, _IONBF, 0);
signal(SIGINT, SIG_IGN);
break;
case 'G':
mimic_gnu = 0;
break;
case 'g':
mimic_gnu = 1;
break;
case 'L':
nesting_limit = atoi(optarg);
break;
case 'o':
trace_file(optarg);
break;
case 'P':
prefix_builtins = 1;
break;
case 'Q':
quiet++;
break;
case 'R':
reload = optarg;
break;
case 's':
synch_lines = 1;
break;
case 't':
mark_traced(optarg, 1);
break;
case 'U': /* undefine... */
macro_popdef(optarg);
break;
case 'v':
fprintf(stderr, "%s version %d\n", getprogname(),
VERSION);
return EXIT_SUCCESS;
case OPT_HELP:
help();
return EXIT_SUCCESS;
case '?':
default:
usage(stderr);
return EXIT_FAILURE;
}
#ifdef REDIRECT
/*
* This is meant only for debugging; it makes all output
* go to a known file, even if the command line options
* send it elsewhere. It should not be turned of in production code.
*/
if (freopen("/tmp/m4", "w+", stderr) == NULL)
err(EXIT_FAILURE, "Can't redirect errors to `%s'",
"/tmp/m4");
#endif
argc -= optind;
argv += optind;
initkwds();
if (mimic_gnu)
setup_builtin("format", FORMATTYPE);
active = stdout; /* default active output */
bbase[0] = bufbase;
if (reload) {
#ifdef REAL_FREEZE
thaw_state(reload);
#else
if (fopen_trypath(infile, reload) == NULL)
err(1, "Can't open `%s'", reload);
sp = -1;
fp = 0;
thawing = 1;
macro();
thawing = 0;
release_input(infile);
#endif
}
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 (wrapindex) {
int i;
ilevel = 0; /* in case m4wrap includes.. */
bufbase = bp = buf; /* use the entire buffer */
if (mimic_gnu) {
while (wrapindex != 0) {
for (i = 0; i < wrapindex; i++)
pbstr(m4wraps[i]);
wrapindex =0;
macro();
}
} else {
for (i = 0; i < wrapindex; i++) {
pbstr(m4wraps[i]);
macro();
}
}
}
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]);
}
#ifdef REAL_FREEZE
if (freeze)
freeze_state(freeze);
#else
if (freezef)
fclose(freezef);
#endif
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(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) {
pushback(t);
while (--i)
pushback(*--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(void)
{
char token[MAXTOK+1];
int t, l;
ndptr p;
int nlpar;
cycle {
t = gpbc();
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 (!quiet) {
if (nlpar == 1)
warnx("unclosed quote:");
else
warnx(
"%d unclosed quotes:",
nlpar);
dump_stack(quotes, nlpar);
}
exit(EXIT_FAILURE);
} else {
if (nlpar > 0) {
if (sp < 0)
reallyputchar(l);
else
CHRSAVE(l);
}
}
}
while (nlpar != 0);
} else if (sp < 0 && LOOK_AHEAD(t, scommt)) {
reallyoutputstr(scommt);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
reallyoutputstr(ecommt);
break;
}
if (t == EOF)
break;
reallyputchar(t);
}
} else if (t == '_' || isalpha(t)) {
p = inspect(t, token);
if (p != NULL)
pushback(l = gpbc());
if (p == NULL || (l != LPAREN &&
(macro_getdef(p)->type & NEEDARGS) != 0))
outputstr(token);
else {
/*
* real thing.. First build a call frame:
*/
pushf(fp); /* previous call frm */
pushf(macro_getdef(p)->type); /* type of the call */
pushf(is_traced(p));
pushf(0); /* parenthesis level */
fp = sp; /* new frame pointer */
/*
* now push the string arguments:
*/
pushs1(macro_getdef(p)->defn); /* defn string */
pushs1((char *)macro_name(p)); /* macro name */
pushs(ep); /* start next..*/
if (l != LPAREN && PARLEV == 0) {
/* no bracks */
chrsave(EOS);
if ((size_t)sp == STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, 2,
CALTYP, TRACESTATUS);
ep = PREVEP; /* flush strspace */
sp = PREVSP; /* previous sp.. */
fp = PREVFP; /* rewind stack...*/
}
}
} else if (t == EOF) {
if (sp > -1 && ilevel <= 0) {
if (!quiet) {
warnx("unexpected end of input, "
"unclosed parenthesis:");
dump_stack(paren, PARLEV);
}
exit(EXIT_FAILURE);
}
if (ilevel <= 0)
break; /* all done thanks.. */
release_input(infile+ilevel--);
emit_synchline();
bufbase = bbase[ilevel];
continue;
} else if (sp < 0) { /* not in a macro at all */
reallyputchar(t); /* output directly.. */
}
else switch(t) {
case LPAREN:
if (PARLEV > 0)
chrsave(t);
while (isspace(l = gpbc())) /* skip blank, tab, nl.. */
if (PARLEV > 0)
chrsave(l);
pushback(l);
record(paren, PARLEV++);
break;
case RPAREN:
if (--PARLEV > 0)
chrsave(t);
else { /* end of argument list */
chrsave(EOS);
if ((size_t)sp == STACKMAX)
errx(1, "internal stack overflow");
eval((const char **) mstack+fp+1, sp-fp,
CALTYP, TRACESTATUS);
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()))
;
pushback(l);
pushs(ep);
} else
chrsave(t);
break;
default:
if (LOOK_AHEAD(t, scommt)) {
char *q;
for (q = scommt; *q; q++)
chrsave(*q);
for(;;) {
t = gpbc();
if (LOOK_AHEAD(t, ecommt)) {
for (q = ecommt; *q; q++)
chrsave(*q);
break;
}
if (t == EOF)
break;
CHRSAVE(t);
}
} else
CHRSAVE(t); /* stack the char */
break;
}
}
}
/*
* output string directly, without pushing it for reparses.
*/
void
outputstr(const char *s)
{
if (sp < 0)
reallyoutputstr(s);
else
while (*s)
CHRSAVE(*s++);
}
void
reallyoutputstr(const char *s)
{
if (synch_lines) {
while (*s) {
fputc(*s, active);
if (*s++ == '\n') {
infile[ilevel].synch_lineno++;
if (infile[ilevel].synch_lineno !=
infile[ilevel].lineno)
do_emit_synchline();
}
}
} else
fputs(s, active);
}
void
reallyputchar(int c)
{
putc(c, active);
if (synch_lines && c == '\n') {
infile[ilevel].synch_lineno++;
if (infile[ilevel].synch_lineno != infile[ilevel].lineno)
do_emit_synchline();
}
}
/*
* build an input token..
* consider only those starting with _ or A-Za-z.
*/
static ndptr
inspect(int c, char *tp)
{
char *name = tp;
char *etp = tp+MAXTOK;
ndptr p;
*tp++ = c;
while ((isalnum(c = gpbc()) || c == '_') && tp < etp)
*tp++ = c;
if (c != EOF)
PUSHBACK(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)
reallyputchar(c);
else
CHRSAVE(c);
}
*name = EOS;
return NULL;
}
p = ohash_find(&macros, ohash_qlookupi(&macros, name, (void *)&tp));
if (p == NULL)
return NULL;
if (macro_getdef(p) == NULL)
return NULL;
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(void)
{
unsigned int type;
size_t i;
for (i = 0; i < MAXKEYS; i++) {
type = keywrds[i].ktyp;
if ((keywrds[i].ktyp & NOARGS) == 0)
type |= NEEDARGS;
setup_builtin(keywrds[i].knam, type);
}
}
static void
record(struct position *t, int lev)
{
if (lev < MAXRECORD) {
t[lev].name = CURRENT_NAME;
t[lev].line = CURRENT_LINE;
}
}
static void
dump_stack(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(void)
{
STACKMAX += STACKMAX/2;
mstack = xrealloc(mstack, sizeof(stae) * STACKMAX,
"Evaluation stack overflow (%lu)",
(unsigned long)STACKMAX);
sstack = xrealloc(sstack, STACKMAX,
"Evaluation stack overflow (%lu)",
(unsigned long)STACKMAX);
}
static const struct {
const char *n;
const char *d;
} nd [] = {
{ "-d, --debug[=flags]", "set debug flags" },
{ "-D, --define=name[=value]", "define macro" },
{ "-e, --error-output=file", "send error output to file" },
{ "-E, --fatal-warnings", "exit on warnings" },
{ "-F, --freeze-state=file", "save state to file" },
{ "-g, --gnu", "enable gnu extensions" },
{ " --help", "print this message and exit" },
{ "-I, --include=file", "include file" },
{ "-i, --interactive", "unbuffer output, ignore tty signals" },
{ "-L, --nesting-limit=num", "macro expansion nesting limit (unimpl)" },
{ "-P, --prefix-builtins", "prefix builtins with m4_" },
{ "-Q, --quiet", "don't print warnings" },
{ "-R, --reload-state=file", "restore state from file" },
{ "-Q, --silent", "don't print warnings" },
{ "-s, --synclines", "output line directives for cpp(1)" },
{ "-t, --trace=macro", "trace the named macro" },
{ "-G, --traditional", "disable gnu extensions" },
{ "-U, --undefine=name", "undefine the named macro" },
{ "-v, --version", "print the version number and exit" },
};
static void
help(void)
{
size_t i;
fprintf(stdout, "%s version %d\n\n", getprogname(), VERSION);
usage(stdout);
fprintf(stdout, "\nThe long options are:\n");
for (i = 0; i < __arraycount(nd); i++)
fprintf(stdout, "\t%-25.25s\t%s\n", nd[i].n, nd[i].d);
}
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