426 lines
11 KiB
C
426 lines
11 KiB
C
/*-
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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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static char sccsid[] = "@(#)main.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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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 <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 "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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unsigned char buf[BUFSIZE]; /* push-back buffer */
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unsigned char *bufbase = buf; /* the base for current ilevel */
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unsigned char *bbase[MAXINP]; /* the base for each ilevel */
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unsigned char *bp = buf; /* first available character */
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unsigned char *endpbb = buf+BUFSIZE; /* end of push-back buffer */
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stae mstack[STACKMAX+1]; /* stack of m4 machine */
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char strspace[STRSPMAX+1]; /* string space for evaluation */
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char *ep = strspace; /* first free char in strspace */
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char *endest= strspace+STRSPMAX;/* end of string space */
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int sp; /* current m4 stack pointer */
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int fp; /* m4 call frame pointer */
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FILE *infile[MAXINP]; /* input file stack (0=stdin) */
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FILE *outfile[MAXOUT]; /* diversion array(0=bitbucket)*/
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FILE *active; /* active output file pointer */
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char *m4temp; /* filename for diversions */
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int ilevel = 0; /* input file stack pointer */
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int oindex = 0; /* diversion index.. */
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char *null = ""; /* as it says.. just a null.. */
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char *m4wraps = ""; /* m4wrap string default.. */
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char *progname; /* name of this program */
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char lquote = LQUOTE; /* left quote character (`) */
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char rquote = RQUOTE; /* right quote character (') */
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char scommt = SCOMMT; /* start character for comment */
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char ecommt = ECOMMT; /* end character for comment */
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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,
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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,
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"changequote", CHNQTYPE,
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"changecom", CHNCTYPE,
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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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#endif
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"popdef", POPDTYPE,
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"pushdef", PUSDTYPE,
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"dumpdef", DUMPTYPE,
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"shift", SHIFTYPE,
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"translit", TRNLTYPE,
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"undefine", UNDFTYPE,
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"undivert", UNDVTYPE,
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"divnum", DIVNTYPE,
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"maketemp", MKTMTYPE,
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"errprint", ERRPTYPE,
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"m4wrap", M4WRTYPE,
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"m4exit", EXITTYPE,
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"syscmd", SYSCTYPE,
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"sysval", SYSVTYPE,
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#ifdef unix
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"unix", MACRTYPE,
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#else
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#ifdef vms
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"vms", MACRTYPE,
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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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void macro();
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void initkwds();
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extern int getopt();
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int
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main(argc,argv)
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int argc;
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char *argv[];
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{
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register int c;
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register int n;
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char *p;
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register FILE *ifp;
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progname = basename(argv[0]);
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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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while ((c = getopt(argc, argv, "tD:U:o:")) != -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 'U': /* undefine... */
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remhash(optarg, TOP);
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break;
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case 'o': /* specific output */
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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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/* filename for diversions */
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m4temp = mktemp(xstrdup(_PATH_DIVNAME));
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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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infile[0] = stdin; /* 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] == '\0')
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ifp = stdin;
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else if ((ifp = fopen(p, "r")) == NULL)
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oops("%s: %s", p, strerror(errno));
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sp = -1;
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fp = 0;
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infile[0] = ifp;
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macro();
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if (ifp != stdin)
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(void)fclose(ifp);
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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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putback(EOF); /* eof is a must !! */
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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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m4temp[UNIQUE] = '0';
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#ifdef vms
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(void) remove(m4temp);
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#else
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(void) unlink(m4temp);
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#endif
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}
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return 0;
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}
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ndptr inspect();
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/*
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* macro - the work horse..
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*/
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void
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macro() {
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char token[MAXTOK];
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register char *s;
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register int t, l;
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register ndptr p;
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register int nlpar;
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cycle {
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if ((t = gpbc()) == '_' || (t != EOF && isalpha(t))) {
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putback(t);
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if ((p = inspect(s = token)) == nil) {
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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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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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pushs(p->defn); /* defn string */
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pushs(p->name); /* macro name */
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pushs(ep); /* start next..*/
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putback(l = gpbc());
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if (l != LPAREN) { /* add bracks */
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putback(RPAREN);
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putback(LPAREN);
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}
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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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oops("unexpected end of input", "");
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if (ilevel <= 0)
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break; /* all done thanks.. */
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--ilevel;
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(void) fclose(infile[ilevel+1]);
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bufbase = bbase[ilevel];
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continue;
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}
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/*
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* non-alpha single-char token seen..
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* [the order of else if .. stmts is important.]
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*/
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else if (t == lquote) { /* strip quotes */
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nlpar = 1;
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do {
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if ((l = gpbc()) == rquote)
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nlpar--;
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else if (l == lquote)
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nlpar++;
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else if (l == EOF)
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oops("missing right quote", "");
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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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while (nlpar != 0);
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}
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else if (sp < 0) { /* not in a macro at all */
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if (t == scommt) { /* comment handling here */
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putc(t, active);
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while ((t = gpbc()) != ecommt)
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putc(t, active);
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}
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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 ((l = gpbc()) != EOF && isspace(l))
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; /* skip blank, tab, nl.. */
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putback(l);
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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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oops("internal stack overflow", "");
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if (CALTYP == MACRTYPE)
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expand((char **) mstack+fp+1, sp-fp);
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else
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eval((char **) mstack+fp+1, sp-fp, 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 ((l = gpbc()) != EOF && isspace(l))
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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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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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* 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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ndptr
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inspect(tp)
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register char *tp;
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{
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register int c;
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register char *name = tp;
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register char *etp = tp+MAXTOK;
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register ndptr p;
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register unsigned long h = 0;
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while ((c = gpbc()) != EOF && (isalnum(c) || c == '_') && tp < etp)
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h = (h << 5) + h + (*tp++ = c);
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putback(c);
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if (tp == etp)
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oops("token too long", "");
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*tp = EOS;
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for (p = hashtab[h%HASHSIZE]; p != nil; p = p->nxtptr)
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if (STREQ(name, p->name))
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break;
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return p;
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}
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/*
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* initkwds - initialise m4 keywords as fast as possible.
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* This very similar to install, but without certain overheads,
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* such as calling lookup. Malloc is not used for storing the
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* keyword strings, since we simply use the static pointers
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* within keywrds block.
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*/
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void
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initkwds() {
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register int i;
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register int h;
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register ndptr p;
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for (i = 0; i < MAXKEYS; i++) {
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h = hash(keywrds[i].knam);
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p = (ndptr) xalloc(sizeof(struct ndblock));
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p->nxtptr = hashtab[h];
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hashtab[h] = p;
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p->name = keywrds[i].knam;
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p->defn = null;
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p->type = keywrds[i].ktyp | STATIC;
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}
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}
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