/* $OpenBSD: main.c,v 1.77 2009/10/14 17:19:47 sthen Exp $ */ /* $NetBSD: main.c,v 1.50 2020/06/25 02:25:53 uwe Exp $ */ /*- * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Ozan Yigit at York University. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ /* * main.c * Facility: m4 macro processor * by: oz */ #if HAVE_NBTOOL_CONFIG_H #include "nbtool_config.h" #endif #include __RCSID("$NetBSD: main.c,v 1.50 2020/06/25 02:25:53 uwe Exp $"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mdef.h" #include "stdd.h" #include "extern.h" #include "pathnames.h" ndptr hashtab[HASHSIZE]; /* hash table for macros etc. */ stae *mstack; /* stack of m4 machine */ char *sstack; /* shadow stack, for string space extension */ static size_t STACKMAX; /* current maximum size of stack */ int sp; /* current m4 stack pointer */ int fp; /* m4 call frame pointer */ struct input_file infile[MAXINP];/* input file stack (0=stdin) */ FILE **outfile; /* diversion array(0=bitbucket)*/ int maxout; FILE *active; /* active output file pointer */ int ilevel = 0; /* input file stack pointer */ int oindex = 0; /* diversion index.. */ const char *null = ""; /* as it says.. just a null.. */ char **m4wraps = NULL; /* m4wraps array. */ int maxwraps = 0; /* size of m4wraps array */ int wrapindex = 0; /* current offset in m4wraps */ char lquote[MAXCCHARS+1] = {LQUOTE}; /* left quote character (`) */ char rquote[MAXCCHARS+1] = {RQUOTE}; /* right quote character (') */ char scommt[MAXCCHARS+1] = {SCOMMT}; /* start character for comment */ char ecommt[MAXCCHARS+1] = {ECOMMT}; /* end character for comment */ int synch_lines = 0; /* line synchronisation for C preprocessor */ int prefix_builtins = 0; /* -P option to prefix builtin keywords */ int fatal_warnings = 0; /* -E option to exit on warnings */ int quiet = 0; /* -Q option to silence warnings */ int nesting_limit = -1; /* -L for nesting limit */ const char *freeze = NULL; /* -F to freeze state */ const char *reload = NULL; /* -R to reload state */ #ifndef REAL_FREEZE FILE *freezef = NULL; int thawing = 0; #endif struct keyblk { const char *knam; /* keyword name */ int ktyp; /* keyword type */ }; struct keyblk keywrds[] = { /* m4 keywords to be installed */ { "include", INCLTYPE }, { "sinclude", SINCTYPE }, { "define", DEFITYPE }, { "defn", DEFNTYPE }, { "divert", DIVRTYPE | NOARGS }, { "expr", EXPRTYPE }, { "eval", EXPRTYPE }, { "substr", SUBSTYPE }, { "ifelse", IFELTYPE }, { "ifdef", IFDFTYPE }, { "len", LENGTYPE }, { "incr", INCRTYPE }, { "decr", DECRTYPE }, { "dnl", DNLNTYPE | NOARGS }, { "changequote", CHNQTYPE | NOARGS }, { "changecom", CHNCTYPE | NOARGS }, { "index", INDXTYPE }, #ifdef EXTENDED { "paste", PASTTYPE }, { "spaste", SPASTYPE }, /* Newer extensions, needed to handle gnu-m4 scripts */ { "indir", INDIRTYPE}, { "builtin", BUILTINTYPE}, { "patsubst", PATSTYPE}, { "regexp", REGEXPTYPE}, { "esyscmd", ESYSCMDTYPE}, { "__file__", FILENAMETYPE | NOARGS}, { "__line__", LINETYPE | NOARGS}, #endif { "popdef", POPDTYPE }, { "pushdef", PUSDTYPE }, { "dumpdef", DUMPTYPE | NOARGS }, { "shift", SHIFTYPE | NOARGS }, { "translit", TRNLTYPE }, { "undefine", UNDFTYPE }, { "undivert", UNDVTYPE | NOARGS }, { "divnum", DIVNTYPE | NOARGS }, { "maketemp", MKTMTYPE }, { "errprint", ERRPTYPE | NOARGS }, { "m4wrap", M4WRTYPE | NOARGS }, { "m4exit", EXITTYPE | NOARGS }, { "syscmd", SYSCTYPE }, { "sysval", SYSVTYPE | NOARGS }, { "traceon", TRACEONTYPE | NOARGS }, { "traceoff", TRACEOFFTYPE | NOARGS }, #if defined(unix) || defined(__unix__) { "unix", SELFTYPE | NOARGS }, #else #ifdef vms { "vms", SELFTYPE | NOARGS }, #endif #endif }; #define MAXKEYS (sizeof(keywrds)/sizeof(struct keyblk)) #define MAXRECORD 50 static struct position { char *name; unsigned long line; } quotes[MAXRECORD], paren[MAXRECORD]; static void record(struct position *, int); static void dump_stack(struct position *, int); static void macro(void); static void initkwds(void); static ndptr inspect(int, char *); static int do_look_ahead(int, const char *); static void reallyoutputstr(const char *); static void reallyputchar(int); static void enlarge_stack(void); static void help(void); static void usage(FILE *f) { fprintf(f, "Usage: %s [-EGgiPQsv] [-Dname[=value]] [-d flags] " "[-I dirname] [-o filename] [-L limit]\n" "\t[-t macro] [-Uname] [file ...]\n", getprogname()); } __dead static void onintr(int signo) { char intrmessage[] = "m4: interrupted.\n"; write(STDERR_FILENO, intrmessage, sizeof(intrmessage)-1); _exit(1); } #define OPT_HELP 1 struct option longopts[] = { { "debug", optional_argument, 0, 'd' }, { "define", required_argument, 0, 'D' }, { "error-output", required_argument, 0, 'o' }, /* sic */ { "fatal-warnings", no_argument, 0, 'E' }, { "freeze-state", required_argument, 0, 'F' }, { "gnu", no_argument, 0, 'g' }, { "help", no_argument, 0, OPT_HELP }, { "include", required_argument, 0, 'I' }, { "interactive", no_argument, 0, 'i' }, { "nesting-limit", required_argument, 0, 'L' }, { "prefix-builtins", no_argument, 0, 'P' }, { "quiet", no_argument, 0, 'Q' }, { "reload-state", required_argument, 0, 'R' }, { "silent", no_argument, 0, 'Q' }, { "synclines", no_argument, 0, 's' }, { "trace", required_argument, 0, 't' }, { "traditional", no_argument, 0, 'G' }, { "undefine", required_argument, 0, 'U' }, { "version", no_argument, 0, 'v' }, #ifdef notyet { "arglength", required_argument, 0, 'l' }, { "debugfile", optional_argument, 0, OPT_DEBUGFILE }, { "hashsize", required_argument, 0, 'H' }, { "warn-macro-sequence",optional_argument, 0, OPT_WARN_SEQUENCE }, #endif { 0, 0, 0, 0 }, }; int main(int argc, char *argv[]) { int c; int n; int error; char *p; setprogname(argv[0]); if (signal(SIGINT, SIG_IGN) != SIG_IGN) signal(SIGINT, onintr); init_macros(); initspaces(); STACKMAX = INITSTACKMAX; mstack = (stae *)xalloc(sizeof(stae) * STACKMAX, NULL); sstack = (char *)xalloc(STACKMAX, NULL); maxout = 0; outfile = NULL; resizedivs(MAXOUT); while ((c = getopt_long(argc, argv, "D:d:EF:GgI:iL:o:PR:Qst:U:v", longopts, NULL)) != -1) switch(c) { case 'D': /* define something..*/ for (p = optarg; *p; p++) if (*p == '=') break; if (*p) *p++ = EOS; dodefine(optarg, p); break; case 'd': set_trace_flags(optarg); break; case 'E': fatal_warnings++; break; case 'F': freeze = optarg; #ifndef REAL_FREEZE if ((freezef = fopen(freeze, "w")) == NULL) err(EXIT_FAILURE, "Can't open `%s'", freeze); #endif break; case 'I': addtoincludepath(optarg); break; case 'i': setvbuf(stdout, NULL, _IONBF, 0); signal(SIGINT, SIG_IGN); break; case 'G': mimic_gnu = 0; break; case 'g': mimic_gnu = 1; break; case 'L': nesting_limit = atoi(optarg); break; case 'o': error = trace_file(optarg); if (error) warn("%s", optarg); break; case 'P': prefix_builtins = 1; break; case 'Q': quiet++; break; case 'R': reload = optarg; break; case 's': synch_lines = 1; break; case 't': mark_traced(optarg, 1); break; case 'U': /* undefine... */ macro_popdef(optarg); break; case 'v': fprintf(stderr, "%s version %d\n", getprogname(), VERSION); return EXIT_SUCCESS; case OPT_HELP: help(); return EXIT_SUCCESS; case '?': default: usage(stderr); return EXIT_FAILURE; } #ifdef REDIRECT /* * This is meant only for debugging; it makes all output * go to a known file, even if the command line options * send it elsewhere. It should not be turned of in production code. */ if (freopen("/tmp/m4", "w+", stderr) == NULL) err(EXIT_FAILURE, "Can't redirect errors to `%s'", "/tmp/m4"); #endif argc -= optind; argv += optind; initkwds(); if (mimic_gnu) setup_builtin("format", FORMATTYPE); active = stdout; /* default active output */ bbase[0] = bufbase; if (reload) { #ifdef REAL_FREEZE thaw_state(reload); #else if (fopen_trypath(infile, reload) == NULL) err(1, "Can't open `%s'", reload); sp = -1; fp = 0; thawing = 1; macro(); thawing = 0; release_input(infile); #endif } if (!argc) { sp = -1; /* stack pointer initialized */ fp = 0; /* frame pointer initialized */ set_input(infile+0, stdin, "stdin"); /* default input (naturally) */ macro(); } else for (; argc--; ++argv) { p = *argv; if (p[0] == '-' && p[1] == EOS) set_input(infile, stdin, "stdin"); else if (fopen_trypath(infile, p) == NULL) err(1, "%s", p); sp = -1; fp = 0; macro(); release_input(infile); } if (wrapindex) { int i; ilevel = 0; /* in case m4wrap includes.. */ bufbase = bp = buf; /* use the entire buffer */ if (mimic_gnu) { while (wrapindex != 0) { for (i = 0; i < wrapindex; i++) pbstr(m4wraps[i]); wrapindex =0; macro(); } } else { for (i = 0; i < wrapindex; i++) { pbstr(m4wraps[i]); macro(); } } } if (active != stdout) active = stdout; /* reset output just in case */ for (n = 1; n < maxout; n++) /* default wrap-up: undivert */ if (outfile[n] != NULL) getdiv(n); /* remove bitbucket if used */ if (outfile[0] != NULL) { (void) fclose(outfile[0]); } #ifdef REAL_FREEZE if (freeze) freeze_state(freeze); #else if (freezef) fclose(freezef); #endif return 0; } /* * Look ahead for `token'. * (on input `t == token[0]') * Used for comment and quoting delimiters. * Returns 1 if `token' present; copied to output. * 0 if `token' not found; all characters pushed back */ static int do_look_ahead(int t, const char *token) { int i; assert((unsigned char)t == (unsigned char)token[0]); for (i = 1; *++token; i++) { t = gpbc(); if (t == EOF || (unsigned char)t != (unsigned char)*token) { pushback(t); while (--i) pushback(*--token); return 0; } } return 1; } #define LOOK_AHEAD(t, token) (t != EOF && \ (unsigned char)(t)==(unsigned char)(token)[0] && \ do_look_ahead(t,token)) /* * macro - the work horse.. */ static void macro(void) { char token[MAXTOK+1]; int t, l; ndptr p; int nlpar; cycle { t = gpbc(); if (LOOK_AHEAD(t,lquote)) { /* strip quotes */ nlpar = 0; record(quotes, nlpar++); /* * Opening quote: scan forward until matching * closing quote has been found. */ do { l = gpbc(); if (LOOK_AHEAD(l,rquote)) { if (--nlpar > 0) outputstr(rquote); } else if (LOOK_AHEAD(l,lquote)) { record(quotes, nlpar++); outputstr(lquote); } else if (l == EOF) { if (!quiet) { if (nlpar == 1) warnx("unclosed quote:"); else warnx( "%d unclosed quotes:", nlpar); dump_stack(quotes, nlpar); } exit(EXIT_FAILURE); } else { if (nlpar > 0) { if (sp < 0) reallyputchar(l); else CHRSAVE(l); } } } while (nlpar != 0); } else if (sp < 0 && LOOK_AHEAD(t, scommt)) { reallyoutputstr(scommt); for(;;) { t = gpbc(); if (LOOK_AHEAD(t, ecommt)) { reallyoutputstr(ecommt); break; } if (t == EOF) break; reallyputchar(t); } } else if (t == '_' || isalpha(t)) { p = inspect(t, token); if (p != NULL) pushback(l = gpbc()); if (p == NULL || (l != LPAREN && (macro_getdef(p)->type & NEEDARGS) != 0)) outputstr(token); else { /* * real thing.. First build a call frame: */ pushf(fp); /* previous call frm */ pushf(macro_getdef(p)->type); /* type of the call */ pushf(is_traced(p)); pushf(0); /* parenthesis level */ fp = sp; /* new frame pointer */ /* * now push the string arguments: * XXX: Copy the macro definition. This leaks, but too * lazy to fix properly. * The problem is that if we evaluate a pushdef'ed * macro and then popdef it while it the definition * is still on the stack we are going to reference * free memory. */ pushs1(xstrdup(macro_getdef(p)->defn)); /* defn string */ pushs1((char *)macro_name(p)); /* macro name */ pushs(ep); /* start next..*/ if (l != LPAREN && PARLEV == 0) { /* no bracks */ chrsave(EOS); if ((size_t)sp == STACKMAX) errx(1, "internal stack overflow"); eval((const char **) mstack+fp+1, 2, CALTYP, TRACESTATUS); ep = PREVEP; /* flush strspace */ sp = PREVSP; /* previous sp.. */ fp = PREVFP; /* rewind stack...*/ } } } else if (t == EOF) { if (sp > -1 && ilevel <= 0) { if (!quiet) { warnx("unexpected end of input, " "unclosed parenthesis:"); dump_stack(paren, PARLEV); } exit(EXIT_FAILURE); } if (ilevel <= 0) break; /* all done thanks.. */ release_input(infile+ilevel--); emit_synchline(); bufbase = bbase[ilevel]; continue; } else if (sp < 0) { /* not in a macro at all */ reallyputchar(t); /* output directly.. */ } else switch(t) { case LPAREN: if (PARLEV > 0) chrsave(t); while (isspace(l = gpbc())) /* skip blank, tab, nl.. */ if (PARLEV > 0) chrsave(l); pushback(l); record(paren, PARLEV++); break; case RPAREN: if (--PARLEV > 0) chrsave(t); else { /* end of argument list */ chrsave(EOS); if ((size_t)sp == STACKMAX) errx(1, "internal stack overflow"); eval((const char **) mstack+fp+1, sp-fp, CALTYP, TRACESTATUS); ep = PREVEP; /* flush strspace */ sp = PREVSP; /* previous sp.. */ fp = PREVFP; /* rewind stack...*/ } break; case COMMA: if (PARLEV == 1) { chrsave(EOS); /* new argument */ while (isspace(l = gpbc())) ; pushback(l); pushs(ep); } else chrsave(t); break; default: if (LOOK_AHEAD(t, scommt)) { char *q; for (q = scommt; *q; q++) chrsave(*q); for(;;) { t = gpbc(); if (LOOK_AHEAD(t, ecommt)) { for (q = ecommt; *q; q++) chrsave(*q); break; } if (t == EOF) break; CHRSAVE(t); } } else CHRSAVE(t); /* stack the char */ break; } } } /* * output string directly, without pushing it for reparses. */ void outputstr(const char *s) { if (sp < 0) reallyoutputstr(s); else while (*s) CHRSAVE(*s++); } void reallyoutputstr(const char *s) { if (synch_lines) { while (*s) { fputc(*s, active); if (*s++ == '\n') { infile[ilevel].synch_lineno++; if (infile[ilevel].synch_lineno != infile[ilevel].lineno) do_emit_synchline(); } } } else fputs(s, active); } void reallyputchar(int c) { putc(c, active); if (synch_lines && c == '\n') { infile[ilevel].synch_lineno++; if (infile[ilevel].synch_lineno != infile[ilevel].lineno) do_emit_synchline(); } } /* * build an input token.. * consider only those starting with _ or A-Za-z. */ static ndptr inspect(int c, char *tp) { char *name = tp; char *etp = tp+MAXTOK; ndptr p; *tp++ = c; while ((isalnum(c = gpbc()) || c == '_') && tp < etp) *tp++ = c; if (c != EOF) PUSHBACK(c); *tp = EOS; /* token is too long, it won't match anything, but it can still * be output. */ if (tp == ep) { outputstr(name); while (isalnum(c = gpbc()) || c == '_') { if (sp < 0) reallyputchar(c); else CHRSAVE(c); } *name = EOS; return NULL; } p = ohash_find(¯os, ohash_qlookupi(¯os, name, (void *)&tp)); if (p == NULL) return NULL; if (macro_getdef(p) == NULL) return NULL; return p; } /* * initkwds - initialise m4 keywords as fast as possible. * This very similar to install, but without certain overheads, * such as calling lookup. Malloc is not used for storing the * keyword strings, since we simply use the static pointers * within keywrds block. */ static void initkwds(void) { unsigned int type; size_t i; for (i = 0; i < MAXKEYS; i++) { type = keywrds[i].ktyp; if ((keywrds[i].ktyp & NOARGS) == 0) type |= NEEDARGS; setup_builtin(keywrds[i].knam, type); } } static void record(struct position *t, int lev) { if (lev < MAXRECORD) { t[lev].name = CURRENT_NAME; t[lev].line = CURRENT_LINE; } } static void dump_stack(struct position *t, int lev) { int i; for (i = 0; i < lev; i++) { if (i == MAXRECORD) { fprintf(stderr, " ...\n"); break; } fprintf(stderr, " %s at line %lu\n", t[i].name, t[i].line); } } static void enlarge_stack(void) { STACKMAX += STACKMAX/2; mstack = xrealloc(mstack, sizeof(stae) * STACKMAX, "Evaluation stack overflow (%lu)", (unsigned long)STACKMAX); sstack = xrealloc(sstack, STACKMAX, "Evaluation stack overflow (%lu)", (unsigned long)STACKMAX); } static const struct { const char *n; const char *d; } nd [] = { { "-d, --debug[=flags]", "set debug flags" }, { "-D, --define=name[=value]", "define macro" }, { "-e, --error-output=file", "send error output to file" }, { "-E, --fatal-warnings", "exit on warnings" }, { "-F, --freeze-state=file", "save state to file" }, { "-g, --gnu", "enable gnu extensions" }, { " --help", "print this message and exit" }, { "-I, --include=file", "include file" }, { "-i, --interactive", "unbuffer output, ignore tty signals" }, { "-L, --nesting-limit=num", "macro expansion nesting limit (unimpl)" }, { "-P, --prefix-builtins", "prefix builtins with m4_" }, { "-Q, --quiet", "don't print warnings" }, { "-R, --reload-state=file", "restore state from file" }, { "-Q, --silent", "don't print warnings" }, { "-s, --synclines", "output line directives for cpp(1)" }, { "-t, --trace=macro", "trace the named macro" }, { "-G, --traditional", "disable gnu extensions" }, { "-U, --undefine=name", "undefine the named macro" }, { "-v, --version", "print the version number and exit" }, }; static void help(void) { size_t i; fprintf(stdout, "%s version %d\n\n", getprogname(), VERSION); usage(stdout); fprintf(stdout, "\nThe long options are:\n"); for (i = 0; i < __arraycount(nd); i++) fprintf(stdout, "\t%-25.25s\t%s\n", nd[i].n, nd[i].d); }