654 lines
15 KiB
C
654 lines
15 KiB
C
/* $OpenBSD: main.c,v 1.77 2009/10/14 17:19:47 sthen Exp $ */
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/* $NetBSD: main.c,v 1.42 2012/04/25 18:23:58 christos Exp $ */
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/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Ozan Yigit at York University.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* main.c
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* Facility: m4 macro processor
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* by: oz
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*/
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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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__RCSID("$NetBSD: main.c,v 1.42 2012/04/25 18:23:58 christos Exp $");
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#include <assert.h>
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#include <signal.h>
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#include <err.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <string.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdlib.h>
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#include <ohash.h>
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#include "mdef.h"
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#include "stdd.h"
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#include "extern.h"
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#include "pathnames.h"
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ndptr hashtab[HASHSIZE]; /* hash table for macros etc. */
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stae *mstack; /* stack of m4 machine */
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char *sstack; /* shadow stack, for string space extension */
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static size_t STACKMAX; /* current maximum size of stack */
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int sp; /* current m4 stack pointer */
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int fp; /* m4 call frame pointer */
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struct input_file infile[MAXINP];/* input file stack (0=stdin) */
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FILE **outfile; /* diversion array(0=bitbucket)*/
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int maxout;
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FILE *active; /* active output file pointer */
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int ilevel = 0; /* input file stack pointer */
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int oindex = 0; /* diversion index.. */
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const char *null = ""; /* as it says.. just a null.. */
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char **m4wraps = NULL; /* m4wraps array. */
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int maxwraps = 0; /* size of m4wraps array */
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int wrapindex = 0; /* current offset in m4wraps */
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char lquote[MAXCCHARS+1] = {LQUOTE}; /* left quote character (`) */
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char rquote[MAXCCHARS+1] = {RQUOTE}; /* right quote character (') */
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char scommt[MAXCCHARS+1] = {SCOMMT}; /* start character for comment */
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char ecommt[MAXCCHARS+1] = {ECOMMT}; /* end character for comment */
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int synch_lines = 0; /* line synchronisation for C preprocessor */
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int prefix_builtins = 0; /* -P option to prefix builtin keywords */
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struct keyblk {
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const char *knam; /* keyword name */
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int ktyp; /* keyword type */
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};
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struct keyblk keywrds[] = { /* m4 keywords to be installed */
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{ "include", INCLTYPE },
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{ "sinclude", SINCTYPE },
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{ "define", DEFITYPE },
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{ "defn", DEFNTYPE },
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{ "divert", DIVRTYPE | NOARGS },
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{ "expr", EXPRTYPE },
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{ "eval", EXPRTYPE },
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{ "substr", SUBSTYPE },
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{ "ifelse", IFELTYPE },
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{ "ifdef", IFDFTYPE },
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{ "len", LENGTYPE },
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{ "incr", INCRTYPE },
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{ "decr", DECRTYPE },
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{ "dnl", DNLNTYPE | NOARGS },
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{ "changequote", CHNQTYPE | NOARGS },
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{ "changecom", CHNCTYPE | NOARGS },
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{ "index", INDXTYPE },
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#ifdef EXTENDED
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{ "paste", PASTTYPE },
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{ "spaste", SPASTYPE },
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/* Newer extensions, needed to handle gnu-m4 scripts */
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{ "indir", INDIRTYPE},
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{ "builtin", BUILTINTYPE},
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{ "patsubst", PATSTYPE},
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{ "regexp", REGEXPTYPE},
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{ "esyscmd", ESYSCMDTYPE},
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{ "__file__", FILENAMETYPE | NOARGS},
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{ "__line__", LINETYPE | NOARGS},
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#endif
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{ "popdef", POPDTYPE },
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{ "pushdef", PUSDTYPE },
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{ "dumpdef", DUMPTYPE | NOARGS },
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{ "shift", SHIFTYPE | NOARGS },
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{ "translit", TRNLTYPE },
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{ "undefine", UNDFTYPE },
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{ "undivert", UNDVTYPE | NOARGS },
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{ "divnum", DIVNTYPE | NOARGS },
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{ "maketemp", MKTMTYPE },
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{ "errprint", ERRPTYPE | NOARGS },
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{ "m4wrap", M4WRTYPE | NOARGS },
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{ "m4exit", EXITTYPE | NOARGS },
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{ "syscmd", SYSCTYPE },
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{ "sysval", SYSVTYPE | NOARGS },
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{ "traceon", TRACEONTYPE | NOARGS },
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{ "traceoff", TRACEOFFTYPE | NOARGS },
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#if defined(unix) || defined(__unix__)
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{ "unix", SELFTYPE | NOARGS },
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#else
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#ifdef vms
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{ "vms", SELFTYPE | NOARGS },
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#endif
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#endif
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};
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#define MAXKEYS (sizeof(keywrds)/sizeof(struct keyblk))
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extern int optind;
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extern char *optarg;
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#define MAXRECORD 50
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static struct position {
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char *name;
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unsigned long line;
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} quotes[MAXRECORD], paren[MAXRECORD];
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static void record(struct position *, int);
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static void dump_stack(struct position *, int);
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static void macro(void);
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static void initkwds(void);
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static ndptr inspect(int, char *);
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static int do_look_ahead(int, const char *);
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static void reallyoutputstr(const char *);
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static void reallyputchar(int);
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static void enlarge_stack(void);
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__dead static void
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usage(void)
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{
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fprintf(stderr, "usage: %s [-gPs] [-Dname[=value]] [-d flags] "
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"[-I dirname] [-o filename]\n"
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"\t[-t macro] [-Uname] [file ...]\n", getprogname());
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exit(1);
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}
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__dead static void
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onintr(int signo)
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{
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char intrmessage[] = "m4: interrupted.\n";
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write(STDERR_FILENO, intrmessage, sizeof(intrmessage)-1);
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_exit(1);
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}
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int
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main(int argc, char *argv[])
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{
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int c;
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int n;
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char *p;
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setprogname(argv[0]);
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if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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signal(SIGINT, onintr);
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init_macros();
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initspaces();
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STACKMAX = INITSTACKMAX;
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mstack = (stae *)xalloc(sizeof(stae) * STACKMAX, NULL);
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sstack = (char *)xalloc(STACKMAX, NULL);
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maxout = 0;
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outfile = NULL;
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resizedivs(MAXOUT);
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while ((c = getopt(argc, argv, "gst:d:D:U:o:I:P")) != -1)
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switch(c) {
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case 'D': /* define something..*/
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for (p = optarg; *p; p++)
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if (*p == '=')
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break;
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if (*p)
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*p++ = EOS;
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dodefine(optarg, p);
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break;
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case 'I':
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addtoincludepath(optarg);
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break;
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case 'P':
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prefix_builtins = 1;
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break;
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case 'U': /* undefine... */
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macro_popdef(optarg);
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break;
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case 'g':
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mimic_gnu = 1;
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break;
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case 'd':
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set_trace_flags(optarg);
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break;
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case 's':
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synch_lines = 1;
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break;
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case 't':
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mark_traced(optarg, 1);
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break;
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case 'o':
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trace_file(optarg);
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break;
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case '?':
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usage();
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}
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argc -= optind;
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argv += optind;
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initkwds();
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if (mimic_gnu)
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setup_builtin("format", FORMATTYPE);
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active = stdout; /* default active output */
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bbase[0] = bufbase;
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if (!argc) {
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sp = -1; /* stack pointer initialized */
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fp = 0; /* frame pointer initialized */
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set_input(infile+0, stdin, "stdin");
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/* default input (naturally) */
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macro();
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} else
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for (; argc--; ++argv) {
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p = *argv;
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if (p[0] == '-' && p[1] == EOS)
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set_input(infile, stdin, "stdin");
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else if (fopen_trypath(infile, p) == NULL)
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err(1, "%s", p);
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sp = -1;
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fp = 0;
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macro();
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release_input(infile);
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}
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if (wrapindex) {
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int i;
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ilevel = 0; /* in case m4wrap includes.. */
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bufbase = bp = buf; /* use the entire buffer */
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if (mimic_gnu) {
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while (wrapindex != 0) {
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for (i = 0; i < wrapindex; i++)
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pbstr(m4wraps[i]);
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wrapindex =0;
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macro();
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}
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} else {
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for (i = 0; i < wrapindex; i++) {
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pbstr(m4wraps[i]);
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macro();
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}
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}
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}
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if (active != stdout)
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active = stdout; /* reset output just in case */
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for (n = 1; n < maxout; n++) /* default wrap-up: undivert */
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if (outfile[n] != NULL)
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getdiv(n);
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/* remove bitbucket if used */
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if (outfile[0] != NULL) {
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(void) fclose(outfile[0]);
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}
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return 0;
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}
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/*
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* Look ahead for `token'.
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* (on input `t == token[0]')
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* Used for comment and quoting delimiters.
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* Returns 1 if `token' present; copied to output.
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* 0 if `token' not found; all characters pushed back
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*/
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static int
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do_look_ahead(int t, const char *token)
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{
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int i;
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assert((unsigned char)t == (unsigned char)token[0]);
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for (i = 1; *++token; i++) {
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t = gpbc();
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if (t == EOF || (unsigned char)t != (unsigned char)*token) {
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pushback(t);
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while (--i)
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pushback(*--token);
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return 0;
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}
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}
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return 1;
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}
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#define LOOK_AHEAD(t, token) (t != EOF && \
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(unsigned char)(t)==(unsigned char)(token)[0] && \
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do_look_ahead(t,token))
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/*
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* macro - the work horse..
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*/
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static void
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macro(void)
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{
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char token[MAXTOK+1];
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int t, l;
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ndptr p;
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int nlpar;
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cycle {
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t = gpbc();
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if (LOOK_AHEAD(t,lquote)) { /* strip quotes */
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nlpar = 0;
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record(quotes, nlpar++);
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/*
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* Opening quote: scan forward until matching
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* closing quote has been found.
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*/
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do {
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l = gpbc();
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if (LOOK_AHEAD(l,rquote)) {
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if (--nlpar > 0)
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outputstr(rquote);
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} else if (LOOK_AHEAD(l,lquote)) {
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record(quotes, nlpar++);
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outputstr(lquote);
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} else if (l == EOF) {
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if (nlpar == 1)
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warnx("unclosed quote:");
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else
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warnx("%d unclosed quotes:", nlpar);
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dump_stack(quotes, nlpar);
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exit(1);
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} else {
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if (nlpar > 0) {
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if (sp < 0)
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reallyputchar(l);
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else
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CHRSAVE(l);
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}
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}
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}
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while (nlpar != 0);
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} else if (sp < 0 && LOOK_AHEAD(t, scommt)) {
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reallyoutputstr(scommt);
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for(;;) {
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t = gpbc();
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if (LOOK_AHEAD(t, ecommt)) {
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reallyoutputstr(ecommt);
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break;
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}
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if (t == EOF)
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break;
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reallyputchar(t);
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}
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} else if (t == '_' || isalpha(t)) {
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p = inspect(t, token);
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if (p != NULL)
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pushback(l = gpbc());
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if (p == NULL || (l != LPAREN &&
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(macro_getdef(p)->type & NEEDARGS) != 0))
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outputstr(token);
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else {
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/*
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* real thing.. First build a call frame:
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*/
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pushf(fp); /* previous call frm */
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pushf(macro_getdef(p)->type); /* type of the call */
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pushf(is_traced(p));
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pushf(0); /* parenthesis level */
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fp = sp; /* new frame pointer */
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/*
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* now push the string arguments:
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*/
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pushs1(macro_getdef(p)->defn); /* defn string */
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pushs1((char *)macro_name(p)); /* macro name */
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pushs(ep); /* start next..*/
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if (l != LPAREN && PARLEV == 0) {
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/* no bracks */
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chrsave(EOS);
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if ((size_t)sp == STACKMAX)
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errx(1, "internal stack overflow");
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eval((const char **) mstack+fp+1, 2,
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CALTYP, TRACESTATUS);
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ep = PREVEP; /* flush strspace */
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sp = PREVSP; /* previous sp.. */
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fp = PREVFP; /* rewind stack...*/
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}
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}
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} else if (t == EOF) {
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if (sp > -1 && ilevel <= 0) {
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warnx( "unexpected end of input, unclosed parenthesis:");
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dump_stack(paren, PARLEV);
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exit(1);
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}
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if (ilevel <= 0)
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break; /* all done thanks.. */
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release_input(infile+ilevel--);
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emit_synchline();
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bufbase = bbase[ilevel];
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continue;
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} else if (sp < 0) { /* not in a macro at all */
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reallyputchar(t); /* output directly.. */
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}
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else switch(t) {
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case LPAREN:
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if (PARLEV > 0)
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chrsave(t);
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while (isspace(l = gpbc())) /* skip blank, tab, nl.. */
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if (PARLEV > 0)
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chrsave(l);
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pushback(l);
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record(paren, PARLEV++);
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break;
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case RPAREN:
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if (--PARLEV > 0)
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chrsave(t);
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else { /* end of argument list */
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chrsave(EOS);
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if ((size_t)sp == STACKMAX)
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errx(1, "internal stack overflow");
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eval((const char **) mstack+fp+1, sp-fp,
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CALTYP, TRACESTATUS);
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ep = PREVEP; /* flush strspace */
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sp = PREVSP; /* previous sp.. */
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fp = PREVFP; /* rewind stack...*/
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}
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break;
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case COMMA:
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if (PARLEV == 1) {
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chrsave(EOS); /* new argument */
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while (isspace(l = gpbc()))
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;
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pushback(l);
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pushs(ep);
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} else
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chrsave(t);
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break;
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default:
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if (LOOK_AHEAD(t, scommt)) {
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char *q;
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for (q = scommt; *q; q++)
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chrsave(*q);
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for(;;) {
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t = gpbc();
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if (LOOK_AHEAD(t, ecommt)) {
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for (q = ecommt; *q; q++)
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chrsave(*q);
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break;
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}
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if (t == EOF)
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break;
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CHRSAVE(t);
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}
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} else
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CHRSAVE(t); /* stack the char */
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break;
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}
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}
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}
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/*
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* output string directly, without pushing it for reparses.
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*/
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void
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outputstr(const char *s)
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{
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if (sp < 0)
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reallyoutputstr(s);
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else
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while (*s)
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CHRSAVE(*s++);
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}
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void
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reallyoutputstr(const char *s)
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{
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if (synch_lines) {
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while (*s) {
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fputc(*s, active);
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if (*s++ == '\n') {
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infile[ilevel].synch_lineno++;
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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(¯os, ohash_qlookupi(¯os, 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 & TYPEMASK;
|
|
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);
|
|
}
|