654 lines
15 KiB
C
654 lines
15 KiB
C
/* $OpenBSD: main.c,v 1.53 2002/04/26 16:15:16 espie Exp $ */
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/* $NetBSD: main.c,v 1.12 1997/02/08 23:54:49 cgd 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1989, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93";
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#else
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#if 0
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static char rcsid[] = "$OpenBSD: main.c,v 1.53 2002/04/26 16:15:16 espie Exp $";
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#endif
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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#include <sys/types.h>
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#include <assert.h>
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#include <signal.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 <stdlib.h>
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#include <err.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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char *inname[MAXINP]; /* names of these input files */
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int inlineno[MAXINP]; /* current number in each input file */
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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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const char *m4wraps = ""; /* m4wrap string default.. */
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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 synccpp; /* Line synchronisation for C preprocessor */
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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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#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 enlarge_stack(void);
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int main(int, char *[]);
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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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traceout = stderr;
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if (signal(SIGINT, SIG_IGN) != SIG_IGN)
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signal(SIGINT, onintr);
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initkwds();
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initspaces();
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STACKMAX = INITSTACKMAX;
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mstack = (stae *)xalloc(sizeof(stae) * STACKMAX);
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sstack = (char *)xalloc(STACKMAX);
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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:")) != -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 'U': /* undefine... */
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remhash(optarg, TOP);
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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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synccpp = 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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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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if ((inname[0] = strdup("-")) == NULL)
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err(1, NULL);
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inlineno[0] = 1;
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emitline();
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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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if ((inname[0] = strdup(p)) == NULL)
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err(1, NULL);
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inlineno[0] = 1;
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emitline();
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macro();
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release_input(infile);
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}
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if (*m4wraps) { /* anything for rundown ?? */
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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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pbstr(m4wraps); /* user-defined wrapup act */
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macro(); /* last will and testament */
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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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putback(t);
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while (--i)
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putback(*--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()
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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 (t == '_' || isalpha(t)) {
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p = inspect(t, token);
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if (p != nil)
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putback(l = gpbc());
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if (p == nil || (l != LPAREN &&
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(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(p->type); /* type of the call */
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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(p->defn); /* defn string */
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pushs1(p->name); /* 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 (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);
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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) {
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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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free(inname[ilevel+1]);
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bufbase = bbase[ilevel];
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emitline();
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continue;
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}
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/*
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* non-alpha token possibly seen..
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* [the order of else if .. stmts is important.]
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*/
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else 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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putc(l, active);
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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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}
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else if (sp < 0 && LOOK_AHEAD(t, scommt)) {
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fputs(scommt, active);
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for(;;) {
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t = gpbc();
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if (LOOK_AHEAD(t, ecommt)) {
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fputs(ecommt, active);
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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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putc(t, active);
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}
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}
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else if (sp < 0) { /* not in a macro at all */
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putc(t, active); /* 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()))
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; /* skip blank, tab, nl.. */
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putback(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 (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);
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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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putback(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 *pc;
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for (pc = scommt; *pc; pc++)
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chrsave(*pc);
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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 (pc = ecommt; *pc; pc++)
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chrsave(*pc);
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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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while (*s)
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putc(*s++, active);
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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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/*
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* build an input token..
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* consider only those starting with _ or A-Za-z. This is a
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* combo with lookup to speed things up.
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*/
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static ndptr
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inspect(int c, char *tp)
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{
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char *name = tp;
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char *etp = tp+MAXTOK;
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ndptr p;
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unsigned int h;
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h = *tp++ = c;
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while ((isalnum(c = gpbc()) || c == '_') && tp < etp)
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h = (h << 5) + h + (*tp++ = c);
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if (c != EOF)
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PUTBACK(c);
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*tp = EOS;
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/* token is too long, it won't match anything, but it can still
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* be output. */
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if (tp == ep) {
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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;
|
|
|
|
for (i = 0; i < MAXKEYS; i++) {
|
|
h = hash(keywrds[i].knam);
|
|
p = (ndptr) xalloc(sizeof(struct ndblock));
|
|
p->nxtptr = hashtab[h % HASHSIZE];
|
|
hashtab[h % HASHSIZE] = p;
|
|
p->name = xstrdup(keywrds[i].knam);
|
|
p->defn = xstrdup(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(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(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(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()
|
|
{
|
|
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);
|
|
}
|
|
|
|
/* Emit preprocessor #line directive if -s option used. */
|
|
void
|
|
emitline(void)
|
|
{
|
|
|
|
if (synccpp)
|
|
fprintf(active, "#line %d \"%s\"\n", inlineno[ilevel],
|
|
inname[ilevel]);
|
|
}
|