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deroff.c
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deroff.c
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/* $NetBSD: deroff.c,v 1.12 2019/02/03 03:19:29 mrg Exp $ */
/* taken from: OpenBSD: deroff.c,v 1.6 2004/06/02 14:58:46 tom Exp */
/*-
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
*/
/*
* Copyright (C) Caldera International Inc. 2001-2002.
* All rights reserved.
*
* 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 and documentation 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed or owned by Caldera
* International, Inc.
* 4. Neither the name of Caldera International, Inc. nor the names of other
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
* INTERNATIONAL, INC. 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 CALDERA INTERNATIONAL, INC. 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.
*/
#include <sys/cdefs.h>
__RCSID("$NetBSD: deroff.c,v 1.12 2019/02/03 03:19:29 mrg Exp $");
#include <err.h>
#include <limits.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
/*
* Deroff command -- strip troff, eqn, and Tbl sequences from
* a file. Has two flags argument, -w, to cause output one word per line
* rather than in the original format.
* -mm (or -ms) causes the corresponding macro's to be interpreted
* so that just sentences are output
* -ml also gets rid of lists.
* Deroff follows .so and .nx commands, removes contents of macro
* definitions, equations (both .EQ ... .EN and $...$),
* Tbl command sequences, and Troff backslash constructions.
*
* All input is through the Cget macro;
* the most recently read character is in c.
*
* Modified by Robert Henry to process -me and -man macros.
*/
#define Cget ( (c=getc(infile)) == EOF ? eof() : ((c==ldelim) ? skeqn() : c) )
#define C1get ( (c=getc(infile)) == EOF ? eof() : c)
#ifdef DEBUG
# define C _C()
# define C1 _C1()
#else /* not DEBUG */
# define C Cget
# define C1 C1get
#endif /* not DEBUG */
#define SKIP while (C != '\n')
#define SKIP1 while (C1 != '\n')
#define SKIP_TO_COM SKIP; SKIP; pc=c; while (C != '.' || pc != '\n' || C > 'Z')pc=c
#define YES 1
#define NO 0
#define MS 0 /* -ms */
#define MM 1 /* -mm */
#define ME 2 /* -me */
#define MA 3 /* -man */
#ifdef DEBUG
static char *mactab[] = { "-ms", "-mm", "-me", "-ma" };
#endif /* DEBUG */
#define ONE 1
#define TWO 2
#define NOCHAR -2
#define SPECIAL 0
#define APOS 1
#define PUNCT 2
#define DIGIT 3
#define LETTER 4
#define MAXFILES 20
static int iflag;
static int wordflag;
static int msflag; /* processing a source written using a mac package */
static int mac; /* which package */
static int disp;
static int parag;
static int inmacro;
static int intable;
static int keepblock; /* keep blocks of text; normally false when msflag */
static char chars[128]; /* SPECIAL, PUNCT, APOS, DIGIT, or LETTER */
static char line[LINE_MAX];
static char *lp;
static int c;
static int pc;
static int ldelim;
static int rdelim;
static char fname[PATH_MAX];
static FILE *files[MAXFILES];
static FILE **filesp;
static FILE *infile;
static int argc;
static char **argv;
#define __USE(a) ((void)(a))
/*
* Macro processing
*
* Macro table definitions
*/
typedef int pacmac; /* compressed macro name */
static int argconcat = 0; /* concat arguments together (-me only) */
#define tomac(c1, c2) ((((c1) & 0xFF) << 8) | ((c2) & 0xFF))
#define frommac(src, c1, c2) (((c1)=((src)>>8)&0xFF),((c2) =(src)&0xFF), __USE(c1), __USE(c2))
struct mactab {
int condition;
pacmac macname;
int (*func)(pacmac);
};
static const struct mactab troffmactab[];
static const struct mactab ppmactab[];
static const struct mactab msmactab[];
static const struct mactab mmmactab[];
static const struct mactab memactab[];
static const struct mactab manmactab[];
/*
* Macro table initialization
*/
#define M(cond, c1, c2, func) {cond, tomac(c1, c2), func}
/*
* Flags for matching conditions other than
* the macro name
*/
#define NONE 0
#define FNEST 1 /* no nested files */
#define NOMAC 2 /* no macro */
#define MAC 3 /* macro */
#define PARAG 4 /* in a paragraph */
#define MSF 5 /* msflag is on */
#define NBLK 6 /* set if no blocks to be kept */
/*
* Return codes from macro minions, determine where to jump,
* how to repeat/reprocess text
*/
#define COMX 1 /* goto comx */
#define COM 2 /* goto com */
static int skeqn(void);
static int eof(void);
#ifdef DEBUG
static int _C1(void);
static int _C(void);
#endif
static int EQ(pacmac);
static int domacro(pacmac);
static int PS(pacmac);
static int skip(pacmac);
static int intbl(pacmac);
static int outtbl(pacmac);
static int so(pacmac);
static int nx(pacmac);
static int skiptocom(pacmac);
static int PP(pacmac);
static int AU(pacmac);
static int SH(pacmac);
static int UX(pacmac);
static int MMHU(pacmac);
static int mesnblock(pacmac);
static int mssnblock(pacmac);
static int nf(pacmac);
static int ce(pacmac);
static int ig(pacmac);
static int meip(pacmac);
static int mepp(pacmac);
static int mesh(pacmac);
static int mefont(pacmac);
static int manfont(pacmac);
static int manpp(pacmac);
static int macsort(const void *, const void *);
static int sizetab(const struct mactab *);
static int ignore(int);
static void getfname(void);
static void textline(char *, int);
static void work(void) __dead;
static void regline(void (*)(char *, int), int);
static void macro(void);
static void tbl(void);
static void stbl(void);
static void eqn(void);
static void backsl(void);
static void sce(void);
static void refer(int);
static void inpic(void);
static void msputmac(char *, int);
static void msputwords(int);
static void meputmac(char *, int);
static void meputwords(int);
static void noblock(char, char, int (int));
static void defcomline(pacmac);
static void comline(void);
static void buildtab(const struct mactab **, int *);
static FILE *opn(char *);
static struct mactab *macfill(struct mactab *, const struct mactab *);
static void usage(void) __dead;
int
main(int ac, char **av)
{
int i, ch;
int errflg = 0;
int kflag = NO;
iflag = NO;
wordflag = NO;
msflag = NO;
mac = ME;
disp = NO;
parag = NO;
inmacro = NO;
intable = NO;
ldelim = NOCHAR;
rdelim = NOCHAR;
keepblock = YES;
while ((ch = getopt(ac, av, "ikpwm:")) != -1) {
switch (ch) {
case 'i':
iflag = YES;
break;
case 'k':
kflag = YES;
break;
case 'm':
msflag = YES;
keepblock = NO;
switch (optarg[0]) {
case 'm':
mac = MM;
break;
case 's':
mac = MS;
break;
case 'e':
mac = ME;
break;
case 'a':
mac = MA;
break;
case 'l':
disp = YES;
break;
default:
errflg++;
break;
}
if (errflg == 0 && optarg[1] != '\0')
errflg++;
break;
case 'p':
parag = YES;
break;
case 'w':
wordflag = YES;
kflag = YES;
break;
default:
errflg++;
}
}
argc = ac - optind;
argv = av + optind;
if (kflag)
keepblock = YES;
if (errflg)
usage();
#ifdef DEBUG
printf("msflag = %d, mac = %s, keepblock = %d, disp = %d\n",
msflag, mactab[mac], keepblock, disp);
#endif /* DEBUG */
if (argc == 0) {
infile = stdin;
} else {
infile = opn(argv[0]);
--argc;
++argv;
}
files[0] = infile;
filesp = &files[0];
for (i = 'a'; i <= 'z' ; ++i)
chars[i] = LETTER;
for (i = 'A'; i <= 'Z'; ++i)
chars[i] = LETTER;
for (i = '0'; i <= '9'; ++i)
chars[i] = DIGIT;
chars['\''] = APOS;
chars['&'] = APOS;
chars['.'] = PUNCT;
chars[','] = PUNCT;
chars[';'] = PUNCT;
chars['?'] = PUNCT;
chars[':'] = PUNCT;
work();
return 0;
}
static int
skeqn(void)
{
while ((c = getc(infile)) != rdelim) {
if (c == EOF)
c = eof();
else if (c == '"') {
while ((c = getc(infile)) != '"') {
if (c == EOF ||
(c == '\\' && (c = getc(infile)) == EOF))
c = eof();
}
}
}
if (msflag)
return (c = 'x');
return (c = ' ');
}
static FILE *
opn(char *p)
{
FILE *fd;
if ((fd = fopen(p, "r")) == NULL)
err(1, "fopen %s", p);
return fd;
}
static int
eof(void)
{
if (infile != stdin)
fclose(infile);
if (filesp > files)
infile = *--filesp;
else if (argc > 0) {
infile = opn(argv[0]);
--argc;
++argv;
} else
exit(0);
return C;
}
static void
getfname(void)
{
char *p;
struct chain {
struct chain *nextp;
char *datap;
} *q;
static struct chain *namechain= NULL;
while (C == ' ')
; /* nothing */
for (p = fname ; p - fname < (ptrdiff_t)sizeof(fname) &&
(*p = c) != '\n' &&
c != ' ' && c != '\t' && c != '\\'; ++p)
C;
*p = '\0';
while (c != '\n')
C;
/* see if this name has already been used */
for (q = namechain ; q; q = q->nextp)
if (strcmp(fname, q->datap) == 0) {
fname[0] = '\0';
return;
}
q = (struct chain *) malloc(sizeof(struct chain));
if (q == NULL)
err(1, NULL);
q->nextp = namechain;
q->datap = strdup(fname);
if (q->datap == NULL)
err(1, NULL);
namechain = q;
}
/*ARGSUSED*/
static void
textline(char *str, int constant)
{
if (wordflag) {
msputwords(0);
return;
}
puts(str);
}
static void
work(void)
{
for (;;) {
C;
#ifdef FULLDEBUG
printf("Starting work with `%c'\n", c);
#endif /* FULLDEBUG */
if (c == '.' || c == '\'')
comline();
else
regline(textline, TWO);
}
}
static void
regline(void (*pfunc)(char *, int), int constant)
{
line[0] = c;
lp = line;
while (lp - line < (ptrdiff_t)sizeof(line)) {
if (c == '\\') {
*lp = ' ';
backsl();
}
if (c == '\n')
break;
if (intable && c == 'T') {
*++lp = C;
if (c == '{' || c == '}') {
lp[-1] = ' ';
*lp = C;
}
} else {
*++lp = C;
}
}
*lp = '\0';
if (line[0] != '\0')
(*pfunc)(line, constant);
}
static void
macro(void)
{
if (msflag) {
do {
SKIP1;
} while (C!='.' || C!='.' || C=='.'); /* look for .. */
if (c != '\n')
SKIP;
return;
}
SKIP;
inmacro = YES;
}
static void
tbl(void)
{
while (C != '.')
; /* nothing */
SKIP;
intable = YES;
}
static void
stbl(void)
{
while (C != '.')
; /* nothing */
SKIP_TO_COM;
if (c != 'T' || C != 'E') {
SKIP;
pc = c;
while (C != '.' || pc != '\n' || C != 'T' || C != 'E')
pc = c;
}
}
static void
eqn(void)
{
int c1, c2;
int dflg;
char last;
last=0;
dflg = 1;
SKIP;
for (;;) {
if (C1 == '.' || c == '\'') {
while (C1 == ' ' || c == '\t')
;
if (c == 'E' && C1 == 'N') {
SKIP;
if (msflag && dflg) {
putchar('x');
putchar(' ');
if (last) {
putchar(last);
putchar('\n');
}
}
#ifdef FULLDEBUG
printf("EQ/EN delim `%c',`%c'\n",
ldelim,rdelim);
#endif /* FULLDEBUG */
return;
}
} else if (c == 'd') {
/* look for delim */
if (C1 == 'e' && C1 == 'l')
if (C1 == 'i' && C1 == 'm') {
while (C1 == ' ')
; /* nothing */
if ((c1 = c) == '\n' ||
(c2 = C1) == '\n' ||
(c1 == 'o' && c2 == 'f' && C1=='f')) {
ldelim = NOCHAR;
rdelim = NOCHAR;
} else {
ldelim = c1;
rdelim = c2;
}
}
dflg = 0;
}
if (c != '\n')
while (C1 != '\n') {
if (chars[c] == PUNCT)
last = c;
else if (c != ' ')
last = 0;
}
}
}
/* skip over a complete backslash construction */
static void
backsl(void)
{
int bdelim;
sw:
switch (C) {
case '"':
SKIP;
return;
case 's':
if (C == '\\')
backsl();
else {
while (C >= '0' && c <= '9')
; /* nothing */
ungetc(c, infile);
c = '0';
}
--lp;
return;
case 'f':
case 'n':
case '*':
if (C != '(')
return;
/* FALLTHROUGH */
case '(':
if (msflag) {
if (C == 'e') {
if (C == 'm') {
*lp = '-';
return;
}
}
else if (c != '\n')
C;
return;
}
if (C != '\n')
C;
return;
case '$':
C; /* discard argument number */
return;
case 'b':
case 'x':
case 'v':
case 'h':
case 'w':
case 'o':
case 'l':
case 'L':
if ((bdelim = C) == '\n')
return;
while (C != '\n' && c != bdelim)
if (c == '\\')
backsl();
return;
case '\\':
if (inmacro)
goto sw;
default:
return;
}
}
static void
sce(void)
{
char *ap;
int n, i;
char a[10];
for (ap = a; C != '\n'; ap++) {
*ap = c;
if (ap == &a[9]) {
SKIP;
ap = a;
break;
}
}
if (ap != a)
n = atoi(a);
else
n = 1;
for (i = 0; i < n;) {
if (C == '.') {
if (C == 'c') {
if (C == 'e') {
while (C == ' ')
; /* nothing */
if (c == '0') {
SKIP;
break;
} else
SKIP;
}
else
SKIP;
} else if (c == 'P' || C == 'P') {
if (c != '\n')
SKIP;
break;
} else if (c != '\n')
SKIP;
} else {
SKIP;
i++;
}
}
}
static void
refer(int c1)
{
int c2;
if (c1 != '\n')
SKIP;
for (c2 = -1;;) {
if (C != '.')
SKIP;
else {
if (C != ']')
SKIP;
else {
while (C != '\n')
c2 = c;
if (c2 != -1 && chars[c2] == PUNCT)
putchar(c2);
return;
}
}
}
}
static void
inpic(void)
{
int c1;
char *p1;
SKIP;
p1 = line;
c = '\n';
for (;;) {
c1 = c;
if (C == '.' && c1 == '\n') {
if (C != 'P') {
if (c == '\n')
continue;
else {
SKIP;
c = '\n';
continue;
}
}
if (C != 'E') {
if (c == '\n')
continue;
else {
SKIP;
c = '\n';
continue;
}
}
SKIP;
return;
}
else if (c == '\"') {
while (C != '\"') {
if (c == '\\') {
if (C == '\"')
continue;
ungetc(c, infile);
backsl();
} else
*p1++ = c;
}
*p1++ = ' ';
}
else if (c == '\n' && p1 != line) {
*p1 = '\0';
if (wordflag)
msputwords(NO);
else {
puts(line);
putchar('\n');
}
p1 = line;
}
}
}
#ifdef DEBUG
static int
_C1(void)
{
return C1get;
}
static int
_C(void)
{
return Cget;
}
#endif /* DEBUG */
static int
ignore(int c)
{
return c;
}
/*
* Put out a macro line, using ms and mm conventions.
*/
static void
msputmac(char *s, int constant)
{
char *t;
int found;
int last;
last = 0;
found = 0;
if (wordflag) {
msputwords(YES);
return;
}
while (*s) {
while (*s == ' ' || *s == '\t')
putchar(*s++);
for (t = s ; *t != ' ' && *t != '\t' && *t != '\0' ; ++t)
; /* nothing */
if (*s == '\"')
s++;
if (t > s + constant && chars[(unsigned char)s[0]] == LETTER &&
chars[(unsigned char)s[1]] == LETTER) {
while (s < t)
if (*s == '\"')
s++;
else
putchar(*s++);
last = *(t-1);
found++;
} else if (found && chars[(unsigned char)s[0]] == PUNCT &&
s[1] == '\0') {
putchar(*s++);
} else {
last = *(t - 1);
s = t;
}
}
putchar('\n');
if (msflag && chars[last] == PUNCT) {
putchar(last);
putchar('\n');
}
}
/*
* put out words (for the -w option) with ms and mm conventions
*/
static void
msputwords(int macline)
{
char *p, *p1;
int i, nlet;
for (p1 = line;;) {
/*
* skip initial specials ampersands and apostrophes
*/
while (chars[(unsigned char)*p1] < DIGIT)
if (*p1++ == '\0')
return;
nlet = 0;
for (p = p1 ; (i = chars[(unsigned char)*p]) != SPECIAL ; ++p)
if (i == LETTER)
++nlet;
if (nlet > 1 && chars[(unsigned char)p1[0]] == LETTER) {
/*
* delete trailing ampersands and apostrophes
*/
while ((i = chars[(unsigned char)p[-1]]) == PUNCT ||
i == APOS )
--p;
while (p1 < p)
putchar(*p1++);
putchar('\n');
} else {
p1 = p;
}
}
}
/*
* put out a macro using the me conventions
*/
#define SKIPBLANK(cp) while (*cp == ' ' || *cp == '\t') { cp++; }
#define SKIPNONBLANK(cp) while (*cp !=' ' && *cp !='\cp' && *cp !='\0') { cp++; }
static void
meputmac(char *cp, int constant)
{
char *np;
int found;
int argno;
int last;
int inquote;
last = 0;
found = 0;
if (wordflag) {
meputwords(YES);
return;
}
for (argno = 0; *cp; argno++) {
SKIPBLANK(cp);
inquote = (*cp == '"');
if (inquote)
cp++;
for (np = cp; *np; np++) {
switch (*np) {
case '\n':
case '\0':
break;
case '\t':
case ' ':
if (inquote)
continue;
else
goto endarg;
case '"':
if (inquote && np[1] == '"') {
memmove(np, np + 1, strlen(np));
np++;
continue;
} else {
*np = ' '; /* bye bye " */
goto endarg;
}
default:
continue;
}
}
endarg: ;
/*
* cp points at the first char in the arg
* np points one beyond the last char in the arg
*/
if ((argconcat == 0) || (argconcat != argno))
putchar(' ');
#ifdef FULLDEBUG
{
char *p;
printf("[%d,%ld: ", argno, np - cp);
for (p = cp; p < np; p++) {
putchar(*p);
}
printf("]");
}
#endif /* FULLDEBUG */
/*
* Determine if the argument merits being printed
*
* constant is the cut off point below which something