main.c revision 95887
195887Sjmallett/* $OpenBSD: main.c,v 1.53 2002/04/26 16:15:16 espie Exp $ */ 295060Sjmallett/* $NetBSD: main.c,v 1.12 1997/02/08 23:54:49 cgd Exp $ */ 395060Sjmallett 41590Srgrimes/*- 51590Srgrimes * Copyright (c) 1989, 1993 61590Srgrimes * The Regents of the University of California. All rights reserved. 71590Srgrimes * 81590Srgrimes * This code is derived from software contributed to Berkeley by 91590Srgrimes * Ozan Yigit at York University. 101590Srgrimes * 111590Srgrimes * Redistribution and use in source and binary forms, with or without 121590Srgrimes * modification, are permitted provided that the following conditions 131590Srgrimes * are met: 141590Srgrimes * 1. Redistributions of source code must retain the above copyright 151590Srgrimes * notice, this list of conditions and the following disclaimer. 161590Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 171590Srgrimes * notice, this list of conditions and the following disclaimer in the 181590Srgrimes * documentation and/or other materials provided with the distribution. 191590Srgrimes * 3. All advertising materials mentioning features or use of this software 201590Srgrimes * must display the following acknowledgement: 211590Srgrimes * This product includes software developed by the University of 221590Srgrimes * California, Berkeley and its contributors. 231590Srgrimes * 4. Neither the name of the University nor the names of its contributors 241590Srgrimes * may be used to endorse or promote products derived from this software 251590Srgrimes * without specific prior written permission. 261590Srgrimes * 271590Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 281590Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 291590Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 301590Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 311590Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 321590Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 331590Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 341590Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 351590Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 361590Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 371590Srgrimes * SUCH DAMAGE. 381590Srgrimes */ 391590Srgrimes 4095060Sjmallett#include <sys/cdefs.h> 4195060Sjmallett__COPYRIGHT("@(#) Copyright (c) 1989, 1993\n\ 4295060Sjmallett The Regents of the University of California. All rights reserved.\n"); 4395887Sjmallett__SCCSID("@(#)main.c 8.1 (Berkeley) 6/6/93"); 4495887Sjmallett__RCSID_SOURCE("$OpenBSD: main.c,v 1.53 2002/04/26 16:15:16 espie Exp $"); 4595060Sjmallett__FBSDID("$FreeBSD: head/usr.bin/m4/main.c 95887 2002-05-01 21:37:29Z jmallett $"); 461590Srgrimes 471590Srgrimes/* 481590Srgrimes * main.c 491590Srgrimes * Facility: m4 macro processor 501590Srgrimes * by: oz 511590Srgrimes */ 521590Srgrimes 531590Srgrimes#include <sys/types.h> 5495060Sjmallett#include <assert.h> 551590Srgrimes#include <signal.h> 5695060Sjmallett#include <errno.h> 5795060Sjmallett#include <unistd.h> 581590Srgrimes#include <stdio.h> 5995060Sjmallett#include <ctype.h> 6095060Sjmallett#include <string.h> 6195060Sjmallett#include <stddef.h> 6280289Sobrien#include <stdlib.h> 6395060Sjmallett#include <err.h> 641590Srgrimes#include "mdef.h" 651590Srgrimes#include "stdd.h" 661590Srgrimes#include "extern.h" 671590Srgrimes#include "pathnames.h" 681590Srgrimes 691590Srgrimesndptr hashtab[HASHSIZE]; /* hash table for macros etc. */ 7095060Sjmallettstae *mstack; /* stack of m4 machine */ 7195060Sjmallettchar *sstack; /* shadow stack, for string space extension */ 7295060Sjmallettstatic size_t STACKMAX; /* current maximum size of stack */ 731590Srgrimesint sp; /* current m4 stack pointer */ 741590Srgrimesint fp; /* m4 call frame pointer */ 7595060Sjmallettstruct input_file infile[MAXINP];/* input file stack (0=stdin) */ 7695060Sjmallettchar *inname[MAXINP]; /* names of these input files */ 7795060Sjmallettint inlineno[MAXINP]; /* current number in each input file */ 7895060SjmallettFILE **outfile; /* diversion array(0=bitbucket)*/ 7995060Sjmallettint maxout; 801590SrgrimesFILE *active; /* active output file pointer */ 811590Srgrimesint ilevel = 0; /* input file stack pointer */ 821590Srgrimesint oindex = 0; /* diversion index.. */ 8395095Sjmallettconst char *null = ""; /* as it says.. just a null.. */ 8495095Sjmallettconst char *m4wraps = ""; /* m4wrap string default.. */ 8595060Sjmallettchar lquote[MAXCCHARS+1] = {LQUOTE}; /* left quote character (`) */ 8695060Sjmallettchar rquote[MAXCCHARS+1] = {RQUOTE}; /* right quote character (') */ 8795060Sjmallettchar scommt[MAXCCHARS+1] = {SCOMMT}; /* start character for comment */ 8895060Sjmallettchar ecommt[MAXCCHARS+1] = {ECOMMT}; /* end character for comment */ 8994957Sjmallettint synccpp; /* Line synchronisation for C preprocessor */ 901590Srgrimes 911590Srgrimesstruct keyblk keywrds[] = { /* m4 keywords to be installed */ 9295060Sjmallett { "include", INCLTYPE }, 9395060Sjmallett { "sinclude", SINCTYPE }, 9495060Sjmallett { "define", DEFITYPE }, 9595060Sjmallett { "defn", DEFNTYPE }, 9695060Sjmallett { "divert", DIVRTYPE | NOARGS }, 9795060Sjmallett { "expr", EXPRTYPE }, 9895060Sjmallett { "eval", EXPRTYPE }, 9995060Sjmallett { "substr", SUBSTYPE }, 10095060Sjmallett { "ifelse", IFELTYPE }, 10195060Sjmallett { "ifdef", IFDFTYPE }, 10295060Sjmallett { "len", LENGTYPE }, 10395060Sjmallett { "incr", INCRTYPE }, 10495060Sjmallett { "decr", DECRTYPE }, 10595060Sjmallett { "dnl", DNLNTYPE | NOARGS }, 10695060Sjmallett { "changequote", CHNQTYPE | NOARGS }, 10795060Sjmallett { "changecom", CHNCTYPE | NOARGS }, 10895060Sjmallett { "index", INDXTYPE }, 1091590Srgrimes#ifdef EXTENDED 11095060Sjmallett { "paste", PASTTYPE }, 11195060Sjmallett { "spaste", SPASTYPE }, 11295060Sjmallett /* Newer extensions, needed to handle gnu-m4 scripts */ 11395060Sjmallett { "indir", INDIRTYPE}, 11495060Sjmallett { "builtin", BUILTINTYPE}, 11595060Sjmallett { "patsubst", PATSTYPE}, 11695060Sjmallett { "regexp", REGEXPTYPE}, 11795060Sjmallett { "esyscmd", ESYSCMDTYPE}, 11895060Sjmallett { "__file__", FILENAMETYPE | NOARGS}, 11995060Sjmallett { "__line__", LINETYPE | NOARGS}, 1201590Srgrimes#endif 12195060Sjmallett { "popdef", POPDTYPE }, 12295060Sjmallett { "pushdef", PUSDTYPE }, 12395060Sjmallett { "dumpdef", DUMPTYPE | NOARGS }, 12495060Sjmallett { "shift", SHIFTYPE | NOARGS }, 12595060Sjmallett { "translit", TRNLTYPE }, 12695060Sjmallett { "undefine", UNDFTYPE }, 12795060Sjmallett { "undivert", UNDVTYPE | NOARGS }, 12895060Sjmallett { "divnum", DIVNTYPE | NOARGS }, 12995060Sjmallett { "maketemp", MKTMTYPE }, 13095060Sjmallett { "errprint", ERRPTYPE | NOARGS }, 13195060Sjmallett { "m4wrap", M4WRTYPE | NOARGS }, 13295060Sjmallett { "m4exit", EXITTYPE | NOARGS }, 13395060Sjmallett { "syscmd", SYSCTYPE }, 13495060Sjmallett { "sysval", SYSVTYPE | NOARGS }, 13595060Sjmallett { "traceon", TRACEONTYPE | NOARGS }, 13695060Sjmallett { "traceoff", TRACEOFFTYPE | NOARGS }, 1371590Srgrimes 13895060Sjmallett#if defined(unix) || defined(__unix__) 13995060Sjmallett { "unix", SELFTYPE | NOARGS }, 1401590Srgrimes#else 1411590Srgrimes#ifdef vms 14295060Sjmallett { "vms", SELFTYPE | NOARGS }, 1431590Srgrimes#endif 1441590Srgrimes#endif 1451590Srgrimes}; 1461590Srgrimes 1471590Srgrimes#define MAXKEYS (sizeof(keywrds)/sizeof(struct keyblk)) 1481590Srgrimes 14995060Sjmallettextern int optind; 15095060Sjmallettextern char *optarg; 1511590Srgrimes 15295060Sjmallett#define MAXRECORD 50 15395060Sjmallettstatic struct position { 15495060Sjmallett char *name; 15595060Sjmallett unsigned long line; 15695060Sjmallett} quotes[MAXRECORD], paren[MAXRECORD]; 15795060Sjmallett 15895060Sjmallettstatic void record(struct position *, int); 15995060Sjmallettstatic void dump_stack(struct position *, int); 16095060Sjmallett 16195060Sjmallettstatic void macro(void); 16295060Sjmallettstatic void initkwds(void); 16395060Sjmallettstatic ndptr inspect(int, char *); 16495060Sjmallettstatic int do_look_ahead(int, const char *); 16595060Sjmallett 16695060Sjmallettstatic void enlarge_stack(void); 16795060Sjmallett 16895060Sjmallettint main(int, char *[]); 16995060Sjmallett 1701590Srgrimesint 17195887Sjmallettmain(int argc, char *argv[]) 1721590Srgrimes{ 17395060Sjmallett int c; 17495060Sjmallett int n; 1751590Srgrimes char *p; 1761590Srgrimes 17795060Sjmallett traceout = stderr; 17895060Sjmallett 1791590Srgrimes if (signal(SIGINT, SIG_IGN) != SIG_IGN) 1801590Srgrimes signal(SIGINT, onintr); 1811590Srgrimes 1821590Srgrimes initkwds(); 18395060Sjmallett initspaces(); 18495060Sjmallett STACKMAX = INITSTACKMAX; 1851590Srgrimes 18695060Sjmallett mstack = (stae *)xalloc(sizeof(stae) * STACKMAX); 18795060Sjmallett sstack = (char *)xalloc(STACKMAX); 18895060Sjmallett 18995060Sjmallett maxout = 0; 19095060Sjmallett outfile = NULL; 19195060Sjmallett resizedivs(MAXOUT); 19295060Sjmallett 19395060Sjmallett while ((c = getopt(argc, argv, "gst:d:D:U:o:I:")) != -1) 1941590Srgrimes switch(c) { 1951590Srgrimes 1961590Srgrimes case 'D': /* define something..*/ 1971590Srgrimes for (p = optarg; *p; p++) 1981590Srgrimes if (*p == '=') 1991590Srgrimes break; 2001590Srgrimes if (*p) 2011590Srgrimes *p++ = EOS; 2021590Srgrimes dodefine(optarg, p); 2031590Srgrimes break; 20495060Sjmallett case 'I': 20595060Sjmallett addtoincludepath(optarg); 20695060Sjmallett break; 2071590Srgrimes case 'U': /* undefine... */ 2081590Srgrimes remhash(optarg, TOP); 2091590Srgrimes break; 21095060Sjmallett case 'g': 21195060Sjmallett mimic_gnu = 1; 21295060Sjmallett break; 21395060Sjmallett case 'd': 21495060Sjmallett set_trace_flags(optarg); 21595060Sjmallett break; 21694957Sjmallett case 's': 21794957Sjmallett synccpp = 1; 21894957Sjmallett break; 21995060Sjmallett case 't': 22095060Sjmallett mark_traced(optarg, 1); 22195060Sjmallett break; 22295060Sjmallett case 'o': 22395060Sjmallett trace_file(optarg); 22495060Sjmallett break; 2251590Srgrimes case '?': 2261590Srgrimes usage(); 2271590Srgrimes } 2281590Srgrimes 2291590Srgrimes argc -= optind; 2301590Srgrimes argv += optind; 2311590Srgrimes 2321590Srgrimes active = stdout; /* default active output */ 2331590Srgrimes bbase[0] = bufbase; 2341590Srgrimes if (!argc) { 2351590Srgrimes sp = -1; /* stack pointer initialized */ 2361590Srgrimes fp = 0; /* frame pointer initialized */ 23795060Sjmallett set_input(infile+0, stdin, "stdin"); 23895060Sjmallett /* default input (naturally) */ 23994957Sjmallett if ((inname[0] = strdup("-")) == NULL) 24094957Sjmallett err(1, NULL); 24194957Sjmallett inlineno[0] = 1; 24294957Sjmallett emitline(); 2431590Srgrimes macro(); 2441590Srgrimes } else 2451590Srgrimes for (; argc--; ++argv) { 2461590Srgrimes p = *argv; 24795060Sjmallett if (p[0] == '-' && p[1] == EOS) 24895060Sjmallett set_input(infile, stdin, "stdin"); 24995060Sjmallett else if (fopen_trypath(infile, p) == NULL) 25027625Scharnier err(1, "%s", p); 2511590Srgrimes sp = -1; 25295060Sjmallett fp = 0; 25394957Sjmallett if ((inname[0] = strdup(p)) == NULL) 25494957Sjmallett err(1, NULL); 25594957Sjmallett inlineno[0] = 1; 25694957Sjmallett emitline(); 2571590Srgrimes macro(); 25895060Sjmallett release_input(infile); 2591590Srgrimes } 2601590Srgrimes 2611590Srgrimes if (*m4wraps) { /* anything for rundown ?? */ 2621590Srgrimes ilevel = 0; /* in case m4wrap includes.. */ 2631590Srgrimes bufbase = bp = buf; /* use the entire buffer */ 2641590Srgrimes pbstr(m4wraps); /* user-defined wrapup act */ 2651590Srgrimes macro(); /* last will and testament */ 2661590Srgrimes } 2671590Srgrimes 2681590Srgrimes if (active != stdout) 2691590Srgrimes active = stdout; /* reset output just in case */ 27095060Sjmallett for (n = 1; n < maxout; n++) /* default wrap-up: undivert */ 2711590Srgrimes if (outfile[n] != NULL) 2721590Srgrimes getdiv(n); 2731590Srgrimes /* remove bitbucket if used */ 27495060Sjmallett if (outfile[0] != NULL) { 27595060Sjmallett (void) fclose(outfile[0]); 27695060Sjmallett } 27795060Sjmallett 2781590Srgrimes return 0; 2791590Srgrimes} 2801590Srgrimes 28195060Sjmallett/* 28295060Sjmallett * Look ahead for `token'. 28395060Sjmallett * (on input `t == token[0]') 28495060Sjmallett * Used for comment and quoting delimiters. 28595060Sjmallett * Returns 1 if `token' present; copied to output. 28695060Sjmallett * 0 if `token' not found; all characters pushed back 28795060Sjmallett */ 28895060Sjmallettstatic int 28995887Sjmallettdo_look_ahead(int t, const char *token) 29095060Sjmallett{ 29195060Sjmallett int i; 2921590Srgrimes 29395060Sjmallett assert((unsigned char)t == (unsigned char)token[0]); 29495060Sjmallett 29595060Sjmallett for (i = 1; *++token; i++) { 29695060Sjmallett t = gpbc(); 29795060Sjmallett if (t == EOF || (unsigned char)t != (unsigned char)*token) { 29895060Sjmallett putback(t); 29995060Sjmallett while (--i) 30095060Sjmallett putback(*--token); 30195060Sjmallett return 0; 30295060Sjmallett } 30395060Sjmallett } 30495060Sjmallett return 1; 30595060Sjmallett} 30695060Sjmallett 30795060Sjmallett#define LOOK_AHEAD(t, token) (t != EOF && \ 30895060Sjmallett (unsigned char)(t)==(unsigned char)(token)[0] && \ 30995060Sjmallett do_look_ahead(t,token)) 31095060Sjmallett 3111590Srgrimes/* 3121590Srgrimes * macro - the work horse.. 3131590Srgrimes */ 31495060Sjmallettstatic void 31595060Sjmallettmacro() 31695060Sjmallett{ 31795060Sjmallett char token[MAXTOK+1]; 31895060Sjmallett int t, l; 31995060Sjmallett ndptr p; 32095060Sjmallett int nlpar; 3211590Srgrimes 3221590Srgrimes cycle { 32395060Sjmallett t = gpbc(); 32495060Sjmallett if (t == '_' || isalpha(t)) { 32595060Sjmallett p = inspect(t, token); 32695060Sjmallett if (p != nil) 32795060Sjmallett putback(l = gpbc()); 32895060Sjmallett if (p == nil || (l != LPAREN && 32995060Sjmallett (p->type & NEEDARGS) != 0)) 33095060Sjmallett outputstr(token); 3311590Srgrimes else { 3321590Srgrimes /* 3331590Srgrimes * real thing.. First build a call frame: 3341590Srgrimes */ 3351590Srgrimes pushf(fp); /* previous call frm */ 3361590Srgrimes pushf(p->type); /* type of the call */ 3371590Srgrimes pushf(0); /* parenthesis level */ 3381590Srgrimes fp = sp; /* new frame pointer */ 3391590Srgrimes /* 3401590Srgrimes * now push the string arguments: 3411590Srgrimes */ 34295060Sjmallett pushs1(p->defn); /* defn string */ 34395060Sjmallett pushs1(p->name); /* macro name */ 34495060Sjmallett pushs(ep); /* start next..*/ 3451590Srgrimes 34695060Sjmallett if (l != LPAREN && PARLEV == 0) { 34795060Sjmallett /* no bracks */ 34895060Sjmallett chrsave(EOS); 34995060Sjmallett 35095060Sjmallett if (sp == STACKMAX) 35195060Sjmallett errx(1, "internal stack overflow"); 35295060Sjmallett eval((const char **) mstack+fp+1, 2, 35395060Sjmallett CALTYP); 35495060Sjmallett 35595060Sjmallett ep = PREVEP; /* flush strspace */ 35695060Sjmallett sp = PREVSP; /* previous sp.. */ 35795060Sjmallett fp = PREVFP; /* rewind stack...*/ 3581590Srgrimes } 3591590Srgrimes } 36095060Sjmallett } else if (t == EOF) { 36195060Sjmallett if (sp > -1) { 36295060Sjmallett warnx( "unexpected end of input, unclosed parenthesis:"); 36395060Sjmallett dump_stack(paren, PARLEV); 36495060Sjmallett exit(1); 36595060Sjmallett } 3661590Srgrimes if (ilevel <= 0) 3671590Srgrimes break; /* all done thanks.. */ 36895060Sjmallett release_input(infile+ilevel--); 36994957Sjmallett free(inname[ilevel+1]); 3701590Srgrimes bufbase = bbase[ilevel]; 37194957Sjmallett emitline(); 3721590Srgrimes continue; 3731590Srgrimes } 3741590Srgrimes /* 37595060Sjmallett * non-alpha token possibly seen.. 3761590Srgrimes * [the order of else if .. stmts is important.] 3771590Srgrimes */ 37895060Sjmallett else if (LOOK_AHEAD(t,lquote)) { /* strip quotes */ 37995060Sjmallett nlpar = 0; 38095060Sjmallett record(quotes, nlpar++); 38195060Sjmallett /* 38295060Sjmallett * Opening quote: scan forward until matching 38395060Sjmallett * closing quote has been found. 38495060Sjmallett */ 3851590Srgrimes do { 38695060Sjmallett 38795060Sjmallett l = gpbc(); 38895060Sjmallett if (LOOK_AHEAD(l,rquote)) { 38995060Sjmallett if (--nlpar > 0) 39095060Sjmallett outputstr(rquote); 39195060Sjmallett } else if (LOOK_AHEAD(l,lquote)) { 39295060Sjmallett record(quotes, nlpar++); 39395060Sjmallett outputstr(lquote); 39495060Sjmallett } else if (l == EOF) { 39595060Sjmallett if (nlpar == 1) 39695060Sjmallett warnx("unclosed quote:"); 3971590Srgrimes else 39895060Sjmallett warnx("%d unclosed quotes:", nlpar); 39995060Sjmallett dump_stack(quotes, nlpar); 40095060Sjmallett exit(1); 40195060Sjmallett } else { 40295060Sjmallett if (nlpar > 0) { 40395060Sjmallett if (sp < 0) 40495060Sjmallett putc(l, active); 40595060Sjmallett else 40695060Sjmallett CHRSAVE(l); 40795060Sjmallett } 4081590Srgrimes } 4091590Srgrimes } 4101590Srgrimes while (nlpar != 0); 4111590Srgrimes } 4121590Srgrimes 41395060Sjmallett else if (sp < 0 && LOOK_AHEAD(t, scommt)) { 41495060Sjmallett fputs(scommt, active); 41595060Sjmallett 41695060Sjmallett for(;;) { 41795060Sjmallett t = gpbc(); 41895060Sjmallett if (LOOK_AHEAD(t, ecommt)) { 41995060Sjmallett fputs(ecommt, active); 42095060Sjmallett break; 42195060Sjmallett } 42295060Sjmallett if (t == EOF) 42395060Sjmallett break; 4241590Srgrimes putc(t, active); 4251590Srgrimes } 42695060Sjmallett } 42795060Sjmallett 42895060Sjmallett else if (sp < 0) { /* not in a macro at all */ 4291590Srgrimes putc(t, active); /* output directly.. */ 4301590Srgrimes } 4311590Srgrimes 4321590Srgrimes else switch(t) { 4331590Srgrimes 4341590Srgrimes case LPAREN: 4351590Srgrimes if (PARLEV > 0) 4361590Srgrimes chrsave(t); 43795060Sjmallett while (isspace(l = gpbc())) 4381590Srgrimes ; /* skip blank, tab, nl.. */ 4391590Srgrimes putback(l); 44095060Sjmallett record(paren, PARLEV++); 4411590Srgrimes break; 4421590Srgrimes 4431590Srgrimes case RPAREN: 4441590Srgrimes if (--PARLEV > 0) 4451590Srgrimes chrsave(t); 4461590Srgrimes else { /* end of argument list */ 4471590Srgrimes chrsave(EOS); 4481590Srgrimes 4491590Srgrimes if (sp == STACKMAX) 45027625Scharnier errx(1, "internal stack overflow"); 4511590Srgrimes 45295060Sjmallett eval((const char **) mstack+fp+1, sp-fp, 45395060Sjmallett CALTYP); 4541590Srgrimes 4551590Srgrimes ep = PREVEP; /* flush strspace */ 4561590Srgrimes sp = PREVSP; /* previous sp.. */ 4571590Srgrimes fp = PREVFP; /* rewind stack...*/ 4581590Srgrimes } 4591590Srgrimes break; 4601590Srgrimes 4611590Srgrimes case COMMA: 4621590Srgrimes if (PARLEV == 1) { 4631590Srgrimes chrsave(EOS); /* new argument */ 46495060Sjmallett while (isspace(l = gpbc())) 4651590Srgrimes ; 4661590Srgrimes putback(l); 4671590Srgrimes pushs(ep); 4681590Srgrimes } else 4691590Srgrimes chrsave(t); 4701590Srgrimes break; 4711590Srgrimes 4721590Srgrimes default: 47395060Sjmallett if (LOOK_AHEAD(t, scommt)) { 47495095Sjmallett char *pc; 47595095Sjmallett for (pc = scommt; *pc; pc++) 47695095Sjmallett chrsave(*pc); 47795060Sjmallett for(;;) { 47895060Sjmallett t = gpbc(); 47995060Sjmallett if (LOOK_AHEAD(t, ecommt)) { 48095095Sjmallett for (pc = ecommt; *pc; pc++) 48195095Sjmallett chrsave(*pc); 48295060Sjmallett break; 48395060Sjmallett } 48495060Sjmallett if (t == EOF) 48595060Sjmallett break; 48695060Sjmallett CHRSAVE(t); 48795060Sjmallett } 48895060Sjmallett } else 48995060Sjmallett CHRSAVE(t); /* stack the char */ 4901590Srgrimes break; 4911590Srgrimes } 4921590Srgrimes } 4931590Srgrimes} 4941590Srgrimes 49595060Sjmallett/* 49695060Sjmallett * output string directly, without pushing it for reparses. 49795060Sjmallett */ 49895060Sjmallettvoid 49995887Sjmallettoutputstr(const char *s) 50095060Sjmallett{ 50195060Sjmallett if (sp < 0) 50295060Sjmallett while (*s) 50395060Sjmallett putc(*s++, active); 50495060Sjmallett else 50595060Sjmallett while (*s) 50695060Sjmallett CHRSAVE(*s++); 50795060Sjmallett} 50895060Sjmallett 5091590Srgrimes/* 5101590Srgrimes * build an input token.. 5111590Srgrimes * consider only those starting with _ or A-Za-z. This is a 5121590Srgrimes * combo with lookup to speed things up. 5131590Srgrimes */ 51495060Sjmallettstatic ndptr 51595887Sjmallettinspect(int c, char *tp) 5161590Srgrimes{ 51795060Sjmallett char *name = tp; 51895060Sjmallett char *etp = tp+MAXTOK; 51995060Sjmallett ndptr p; 52095060Sjmallett unsigned int h; 52195060Sjmallett 52295060Sjmallett h = *tp++ = c; 5231590Srgrimes 52495060Sjmallett while ((isalnum(c = gpbc()) || c == '_') && tp < etp) 5251590Srgrimes h = (h << 5) + h + (*tp++ = c); 52695060Sjmallett if (c != EOF) 52795060Sjmallett PUTBACK(c); 5281590Srgrimes *tp = EOS; 52995060Sjmallett /* token is too long, it won't match anything, but it can still 53095060Sjmallett * be output. */ 53195060Sjmallett if (tp == ep) { 53295060Sjmallett outputstr(name); 53395060Sjmallett while (isalnum(c = gpbc()) || c == '_') { 53495060Sjmallett if (sp < 0) 53595060Sjmallett putc(c, active); 53695060Sjmallett else 53795060Sjmallett CHRSAVE(c); 53895060Sjmallett } 53995060Sjmallett *name = EOS; 54095060Sjmallett return nil; 54195060Sjmallett } 5421590Srgrimes 54395060Sjmallett for (p = hashtab[h % HASHSIZE]; p != nil; p = p->nxtptr) 54495060Sjmallett if (h == p->hv && STREQ(name, p->name)) 5451590Srgrimes break; 5461590Srgrimes return p; 5471590Srgrimes} 5481590Srgrimes 5491590Srgrimes/* 55095060Sjmallett * initkwds - initialise m4 keywords as fast as possible. 5511590Srgrimes * This very similar to install, but without certain overheads, 55295060Sjmallett * such as calling lookup. Malloc is not used for storing the 55395060Sjmallett * keyword strings, since we simply use the static pointers 5541590Srgrimes * within keywrds block. 5551590Srgrimes */ 55695060Sjmallettstatic void 55795060Sjmallettinitkwds() 55895060Sjmallett{ 55995060Sjmallett size_t i; 56095060Sjmallett unsigned int h; 56195060Sjmallett ndptr p; 5621590Srgrimes 5631590Srgrimes for (i = 0; i < MAXKEYS; i++) { 5641590Srgrimes h = hash(keywrds[i].knam); 56595060Sjmallett p = (ndptr) xalloc(sizeof(struct ndblock)); 56695060Sjmallett p->nxtptr = hashtab[h % HASHSIZE]; 56795060Sjmallett hashtab[h % HASHSIZE] = p; 56895060Sjmallett p->name = xstrdup(keywrds[i].knam); 56995095Sjmallett p->defn = xstrdup(null); 57095060Sjmallett p->hv = h; 57195060Sjmallett p->type = keywrds[i].ktyp & TYPEMASK; 57295060Sjmallett if ((keywrds[i].ktyp & NOARGS) == 0) 57395060Sjmallett p->type |= NEEDARGS; 5741590Srgrimes } 5751590Srgrimes} 57694957Sjmallett 57795060Sjmallett/* Look up a builtin type, even if overridden by the user */ 57895060Sjmallettint 57995887Sjmallettbuiltin_type(const char *key) 58095060Sjmallett{ 58195060Sjmallett int i; 58295060Sjmallett 58395060Sjmallett for (i = 0; i != MAXKEYS; i++) 58495060Sjmallett if (STREQ(keywrds[i].knam, key)) 58595060Sjmallett return keywrds[i].ktyp; 58695060Sjmallett return -1; 58795060Sjmallett} 58895060Sjmallett 58995095Sjmallettconst char * 59095887Sjmallettbuiltin_realname(int n) 59195060Sjmallett{ 59295060Sjmallett int i; 59395060Sjmallett 59495060Sjmallett for (i = 0; i != MAXKEYS; i++) 59595060Sjmallett if (((keywrds[i].ktyp ^ n) & TYPEMASK) == 0) 59695060Sjmallett return keywrds[i].knam; 59795060Sjmallett return NULL; 59895060Sjmallett} 59995060Sjmallett 60095060Sjmallettstatic void 60195887Sjmallettrecord(struct position *t, int lev) 60295060Sjmallett{ 60395060Sjmallett if (lev < MAXRECORD) { 60495060Sjmallett t[lev].name = CURRENT_NAME; 60595060Sjmallett t[lev].line = CURRENT_LINE; 60695060Sjmallett } 60795060Sjmallett} 60895060Sjmallett 60995060Sjmallettstatic void 61095887Sjmallettdump_stack(struct position *t, int lev) 61195060Sjmallett{ 61295060Sjmallett int i; 61395060Sjmallett 61495060Sjmallett for (i = 0; i < lev; i++) { 61595060Sjmallett if (i == MAXRECORD) { 61695060Sjmallett fprintf(stderr, " ...\n"); 61795060Sjmallett break; 61895060Sjmallett } 61995060Sjmallett fprintf(stderr, " %s at line %lu\n", 62095060Sjmallett t[i].name, t[i].line); 62195060Sjmallett } 62295060Sjmallett} 62395060Sjmallett 62495060Sjmallett 62595060Sjmallettstatic void 62695060Sjmallettenlarge_stack() 62795060Sjmallett{ 62895060Sjmallett STACKMAX *= 2; 62995060Sjmallett mstack = realloc(mstack, sizeof(stae) * STACKMAX); 63095060Sjmallett sstack = realloc(sstack, STACKMAX); 63195060Sjmallett if (mstack == NULL || sstack == NULL) 63295060Sjmallett errx(1, "Evaluation stack overflow (%lu)", 63395060Sjmallett (unsigned long)STACKMAX); 63495060Sjmallett} 63595060Sjmallett 63694957Sjmallett/* Emit preprocessor #line directive if -s option used. */ 63794957Sjmallettvoid 63894957Sjmallettemitline(void) 63994957Sjmallett{ 64095060Sjmallett 64194957Sjmallett if (synccpp) 64294957Sjmallett fprintf(active, "#line %d \"%s\"\n", inlineno[ilevel], 64395060Sjmallett inname[ilevel]); 64494957Sjmallett} 645