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freebsd/usr.bin/unifdef/unifdef.c

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/*
* Copyright (c) 1985, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Dave Yost.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1985, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif
#ifndef lint
static const char sccsid[] = "@(#)unifdef.c 8.1 (Berkeley) 6/6/93";
#endif
/*
* unifdef - remove ifdef'ed lines
*
* Warning: will not work correctly if input contains null characters.
*
* Wishlist:
* provide an option which will append the name of the
* appropriate symbol after #else's and #endif's
* provide an option which will check symbols after
* #else's and #endif's to see that they match their
* corresponding #ifdef or #ifndef
*/
#include <ctype.h>
#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
typedef int Reject_level;
#define BSS
FILE *input;
#ifndef YES
#define YES 1
#define NO 0
#endif/*YES */
typedef int Bool;
typedef int Linetype;
const char *filename BSS;
char text BSS; /* -t option in effect: this is a text file */
char lnblank BSS; /* -l option in effect: blank deleted lines */
char complement BSS; /* -c option in effect: complement the operation */
#define MAXSYMS 100
char *symname[MAXSYMS] BSS; /* symbol name */
char true[MAXSYMS] BSS; /* -Dsym */
char ignore[MAXSYMS] BSS; /* -iDsym or -iUsym */
char insym[MAXSYMS] BSS; /* state: false, inactive, true */
#define SYM_INACTIVE 0 /* symbol is currently inactive */
#define SYM_FALSE 1 /* symbol is currently false */
#define SYM_TRUE 2 /* symbol is currently true */
char nsyms BSS;
char incomment BSS; /* inside C comment */
#define QUOTE_NONE 0
#define QUOTE_SINGLE 1
#define QUOTE_DOUBLE 2
char inquote BSS; /* inside single or double quotes */
int exitstat BSS;
char *skipcomment __P((char *));
char *skipquote __P((char *, int));
static void usage __P((void));
void flushline __P((Bool));
int getlin __P((char *, int, FILE *, int));
int error __P((int, int, int));
void pfile __P((void));
int doif __P((int, int, Reject_level, int));
int findsym __P((char *));
Linetype checkline __P((int *));
int
main (argc, argv)
int argc;
char **argv;
{
char **curarg;
char *cp;
char *cp1;
char ignorethis;
for (curarg = &argv[1]; --argc > 0; curarg++) {
if (*(cp1 = cp = *curarg) != '-')
break;
if (*++cp1 == 'i') {
ignorethis = YES;
cp1++;
} else
ignorethis = NO;
if ( ( *cp1 == 'D'
|| *cp1 == 'U'
)
&& cp1[1] != '\0'
) {
int symind;
if ((symind = findsym (&cp1[1])) < 0) {
if (nsyms >= MAXSYMS)
errx(2, "too many symbols");
symind = nsyms++;
symname[symind] = &cp1[1];
insym[symind] = SYM_INACTIVE;
}
ignore[symind] = ignorethis;
true[symind] = *cp1 == 'D' ? YES : NO;
} else if (ignorethis)
goto unrec;
else if (strcmp (&cp[1], "t") == 0)
text = YES;
else if (strcmp (&cp[1], "l") == 0)
lnblank = YES;
else if (strcmp (&cp[1], "c") == 0)
complement = YES;
else {
unrec:
warnx("unrecognized option: %s", cp);
usage();
}
}
if (nsyms == 0)
usage();
if (argc > 1) {
warnx("can only do one file");
} else if (argc == 1) {
filename = *curarg;
if ((input = fopen (filename, "r")) != NULL) {
pfile();
(void) fclose (input);
} else {
warn("can't open %s", *curarg);
}
} else {
filename = "[stdin]";
input = stdin;
pfile();
}
(void) fflush (stdout);
exit (exitstat);
}
static void
usage()
{
fprintf (stderr, "usage: %s",
"unifdef [-l] [-t] [-c] [[-Dsym] [-Usym] [-iDsym] [-iUsym]] ... [file]\n");
exit (2);
}
/* types of input lines: */
#define LT_PLAIN 0 /* ordinary line */
#define LT_TRUE 1 /* a true #ifdef of a symbol known to us */
#define LT_FALSE 2 /* a false #ifdef of a symbol known to us */
#define LT_OTHER 3 /* an #ifdef of a symbol not known to us */
#define LT_IF 4 /* an #ifdef of a symbol not known to us */
#define LT_ELSE 5 /* #else */
#define LT_ENDIF 6 /* #endif */
#define LT_LEOF 7 /* end of file */
Reject_level reject BSS; /* 0 or 1: pass thru; 1 or 2: ignore comments */
#define REJ_NO 0
#define REJ_IGNORE 1
#define REJ_YES 2
int linenum BSS; /* current line number */
int stqcline BSS; /* start of current coment or quote */
const char *errs[] = {
#define NO_ERR 0
"",
#define END_ERR 1
"",
#define ELSE_ERR 2
"Inappropriate else",
#define ENDIF_ERR 3
"Inappropriate endif",
#define IEOF_ERR 4
"Premature EOF in ifdef",
#define CEOF_ERR 5
"Premature EOF in comment",
#define Q1EOF_ERR 6
"Premature EOF in quoted character",
#define Q2EOF_ERR 7
"Premature EOF in quoted string"
};
/* States for inif arg to doif */
#define IN_NONE 0
#define IN_IF 1
#define IN_ELSE 2
void
pfile ()
{
reject = REJ_NO;
(void) doif (-1, IN_NONE, reject, 0);
}
int
doif (thissym, inif, prevreject, depth)
int thissym; /* index of the symbol who was last ifdef'ed */
int inif; /* YES or NO we are inside an ifdef */
Reject_level prevreject;/* previous value of reject */
int depth; /* depth of ifdef's */
{
Linetype lineval;
Reject_level thisreject;
int doret; /* tmp return value of doif */
int cursym; /* index of the symbol returned by checkline */
int stline; /* line number when called this time */
stline = linenum;
for (;;) {
switch (lineval = checkline (&cursym)) {
case LT_PLAIN:
flushline (YES);
break;
case LT_TRUE:
case LT_FALSE:
thisreject = reject;
if (lineval == LT_TRUE)
insym[cursym] = SYM_TRUE;
else {
if (reject != REJ_YES)
reject = ignore[cursym] ? REJ_IGNORE : REJ_YES;
insym[cursym] = SYM_FALSE;
}
if (ignore[cursym])
flushline (YES);
else {
exitstat = 1;
flushline (NO);
}
if ((doret = doif (cursym, IN_IF, thisreject, depth + 1)) != NO_ERR)
return error (doret, stline, depth);
break;
case LT_IF:
case LT_OTHER:
flushline (YES);
if ((doret = doif (-1, IN_IF, reject, depth + 1)) != NO_ERR)
return error (doret, stline, depth);
break;
case LT_ELSE:
if (inif != IN_IF)
return error (ELSE_ERR, linenum, depth);
inif = IN_ELSE;
if (thissym >= 0) {
if (insym[thissym] == SYM_TRUE) {
reject = ignore[thissym] ? REJ_IGNORE : REJ_YES;
insym[thissym] = SYM_FALSE;
} else { /* (insym[thissym] == SYM_FALSE) */
reject = prevreject;
insym[thissym] = SYM_TRUE;
}
if (!ignore[thissym]) {
flushline (NO);
break;
}
}
flushline (YES);
break;
case LT_ENDIF:
if (inif == IN_NONE)
return error (ENDIF_ERR, linenum, depth);
if (thissym >= 0) {
insym[thissym] = SYM_INACTIVE;
reject = prevreject;
if (!ignore[thissym]) {
flushline (NO);
return NO_ERR;
}
}
flushline (YES);
return NO_ERR;
case LT_LEOF: {
int lerr;
lerr = incomment
? CEOF_ERR
: inquote == QUOTE_SINGLE
? Q1EOF_ERR
: inquote == QUOTE_DOUBLE
? Q2EOF_ERR
: NO_ERR;
if (inif != IN_NONE) {
if (lerr != NO_ERR)
(void) error (lerr, stqcline, depth);
return error (IEOF_ERR, stline, depth);
} else if (lerr != NO_ERR)
return error (lerr, stqcline, depth);
else
return NO_ERR;
}
}
}
}
#define endsym(c) (!isalpha (c) && !isdigit (c) && c != '_')
#define MAXLINE 256
char tline[MAXLINE] BSS;
Linetype
checkline (cursym)
int *cursym; /* if LT_TRUE or LT_FALSE returned, set this to sym index */
{
char *cp;
char *symp;
char *scp;
Linetype retval;
# define KWSIZE 8
char keyword[KWSIZE];
linenum++;
if (getlin (tline, sizeof tline, input, NO) == EOF)
return LT_LEOF;
retval = LT_PLAIN;
if ( *(cp = tline) != '#'
|| incomment
|| inquote == QUOTE_SINGLE
|| inquote == QUOTE_DOUBLE
)
goto eol;
cp = skipcomment (++cp);
symp = keyword;
while (!endsym (*cp)) {
*symp = *cp++;
if (++symp >= &keyword[KWSIZE])
goto eol;
}
*symp = '\0';
if (strcmp (keyword, "ifdef") == 0) {
retval = YES;
goto ifdef;
} else if (strcmp (keyword, "ifndef") == 0) {
retval = NO;
ifdef:
scp = cp = skipcomment (++cp);
if (incomment) {
retval = LT_PLAIN;
goto eol;
}
{
int symind;
if ((symind = findsym (scp)) >= 0)
retval = (retval ^ true[*cursym = symind])
? LT_FALSE : LT_TRUE;
else
retval = LT_OTHER;
}
} else if (strcmp (keyword, "if") == 0)
retval = LT_IF;
else if (strcmp (keyword, "else") == 0)
retval = LT_ELSE;
else if (strcmp (keyword, "endif") == 0)
retval = LT_ENDIF;
eol:
if (!text && reject != REJ_IGNORE)
for (; *cp; ) {
if (incomment)
cp = skipcomment (cp);
else if (inquote == QUOTE_SINGLE)
cp = skipquote (cp, QUOTE_SINGLE);
else if (inquote == QUOTE_DOUBLE)
cp = skipquote (cp, QUOTE_DOUBLE);
else if (*cp == '/' && cp[1] == '*')
cp = skipcomment (cp);
else if (*cp == '\'')
cp = skipquote (cp, QUOTE_SINGLE);
else if (*cp == '"')
cp = skipquote (cp, QUOTE_DOUBLE);
else
cp++;
}
return retval;
}
/*
* Skip over comments and stop at the next charaacter
* position that is not whitespace.
*/
char *
skipcomment (cp)
char *cp;
{
if (incomment)
goto inside;
for (;; cp++) {
while (*cp == ' ' || *cp == '\t')
cp++;
if (text)
return cp;
if ( cp[0] != '/'
|| cp[1] != '*'
)
return cp;
cp += 2;
if (!incomment) {
incomment = YES;
stqcline = linenum;
}
inside:
for (;;) {
for (; *cp != '*'; cp++)
if (*cp == '\0')
return cp;
if (*++cp == '/') {
incomment = NO;
break;
}
}
}
}
/*
* Skip over a quoted string or character and stop at the next charaacter
* position that is not whitespace.
*/
char *
skipquote (cp, type)
char *cp;
int type;
{
char qchar;
qchar = type == QUOTE_SINGLE ? '\'' : '"';
if (inquote == type)
goto inside;
for (;; cp++) {
if (*cp != qchar)
return cp;
cp++;
inquote = type;
stqcline = linenum;
inside:
for (; ; cp++) {
if (*cp == qchar)
break;
if ( *cp == '\0'
|| (*cp == '\\' && *++cp == '\0')
)
return cp;
}
inquote = QUOTE_NONE;
}
}
/*
* findsym - look for the symbol in the symbol table.
* if found, return symbol table index,
* else return -1.
*/
int
findsym (str)
char *str;
{
char *cp;
char *symp;
int symind;
char chr;
for (symind = 0; symind < nsyms; ++symind) {
if (insym[symind] == SYM_INACTIVE) {
for ( symp = symname[symind], cp = str
; *symp && *cp == *symp
; cp++, symp++
)
continue;
chr = *cp;
if (*symp == '\0' && endsym (chr))
return symind;
}
}
return -1;
}
/*
* getlin - expands tabs if asked for
* and (if compiled in) treats form-feed as an end-of-line
*/
int
getlin (line, maxline, inp, expandtabs)
char *line;
int maxline;
FILE *inp;
int expandtabs;
{
int tmp;
int num;
int chr;
#ifdef FFSPECIAL
static char havechar = NO; /* have leftover char from last time */
static char svchar BSS;
#endif/*FFSPECIAL */
num = 0;
#ifdef FFSPECIAL
if (havechar) {
havechar = NO;
chr = svchar;
goto ent;
}
#endif/*FFSPECIAL */
while (num + 8 < maxline) { /* leave room for tab */
chr = getc (inp);
if (isprint (chr)) {
#ifdef FFSPECIAL
ent:
#endif/*FFSPECIAL */
*line++ = chr;
num++;
} else
switch (chr) {
case EOF:
return EOF;
case '\t':
if (expandtabs) {
num += tmp = 8 - (num & 7);
do
*line++ = ' ';
while (--tmp);
break;
}
default:
*line++ = chr;
num++;
break;
case '\n':
*line = '\n';
num++;
goto end;
#ifdef FFSPECIAL
case '\f':
if (++num == 1)
*line = '\f';
else {
*line = '\n';
havechar = YES;
svchar = chr;
}
goto end;
#endif/*FFSPECIAL */
}
}
end:
*++line = '\0';
return num;
}
void
flushline (keep)
Bool keep;
{
if ((keep && reject != REJ_YES) ^ complement) {
char *line = tline;
FILE *out = stdout;
char chr;
while ((chr = *line++))
putc (chr, out);
} else if (lnblank)
putc ('\n', stdout);
}
int
error (lerr, line, depth)
int lerr; /* type of error & index into error string array */
int line; /* line number */
int depth; /* how many ifdefs we are inside */
{
if (lerr == END_ERR)
return lerr;
#ifndef TESTING
warnx("error in %s line %d: %s", filename, line, errs[lerr]);
#else/* TESTING */
warnx("error in %s line %d: %s. ifdef depth: %d",
filename, line, errs[lerr], depth);
#endif/*TESTING */
exitstat = 2;
return depth > 1 ? IEOF_ERR : END_ERR;
}
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