8a16b7a18f
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
635 lines
15 KiB
C
635 lines
15 KiB
C
/* $OpenBSD: main.c,v 1.86 2015/11/03 16:21:47 deraadt 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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* SPDX-License-Identifier: BSD-3-Clause
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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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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static 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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{ "mkstemp", 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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{ "unix", SELFTYPE | NOARGS },
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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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int main(int, char *[]);
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int exit_code = 0;
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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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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 = xreallocarray(NULL, STACKMAX, sizeof(stae), NULL);
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sstack = 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 exit_code;
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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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pushdef(p); /* 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 (sp == (int)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 (!mimic_gnu /* you can puke right there */
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&& 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 (sp == (int)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 *p;
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for (p = scommt; *p; p++)
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chrsave(*p);
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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 (p = ecommt; *p; p++)
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chrsave(*p);
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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 !=
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infile[ilevel].lineno)
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do_emit_synchline();
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}
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}
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} else
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fputs(s, active);
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}
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void
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reallyputchar(int c)
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{
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putc(c, active);
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if (synch_lines && c == '\n') {
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infile[ilevel].synch_lineno++;
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if (infile[ilevel].synch_lineno != infile[ilevel].lineno)
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do_emit_synchline();
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}
|
|
}
|
|
|
|
/*
|
|
* 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, (const char **)&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;
|
|
int i;
|
|
|
|
for (i = 0; i < (int)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 = xreallocarray(mstack, STACKMAX, sizeof(stae),
|
|
"Evaluation stack overflow (%lu)",
|
|
(unsigned long)STACKMAX);
|
|
sstack = xrealloc(sstack, STACKMAX,
|
|
"Evaluation stack overflow (%lu)",
|
|
(unsigned long)STACKMAX);
|
|
}
|