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It is probably a bad idea to unconditionally process directives with

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constant controlling expressions: in particular, removing #if 0 sections
is considered "rude". This commit changes the default so that such
things are passed through unchanged, and the old behaviour can be had
with the -k "kill konsts" flag.

Suggested by:	markm
MFC after:	3 weeks
This commit is contained in:
Tony Finch 2002-09-24 19:27:44 +00:00
parent 73be6d69ef
commit 352d0a6932
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=103906
2 changed files with 41 additions and 10 deletions
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26
usr.bin/unifdef/unifdef.1
View File

@ -33,10 +33,10 @@
.\" SUCH DAMAGE.
.\"
.\" @(#)unifdef.1 8.2 (Berkeley) 4/1/94
.\" $dotat: things/unifdef.1,v 1.23 2002/05/14 22:15:03 fanf Exp $
.\" $dotat: things/unifdef.1,v 1.25 2002/09/24 19:16:29 fanf2 Exp $
.\" $FreeBSD$
.\"
.Dd April 26, 2002
.Dd September 24, 2002
.Dt UNIFDEF 1
.Os
.Sh NAME
@ -44,7 +44,7 @@
.Nd remove preprocessor conditionals from code
.Sh SYNOPSIS
.Nm
.Op Fl clst
.Op Fl cklst
.Oo
.Fl I Ns Ar path
.Fl D Ns Ar sym Ns Op = Ns Ar val
@ -97,6 +97,14 @@ and
directives are only processed
if the symbol is specified on the command line,
otherwise they are also passed through unchanged.
Constant
.Ic #if
and
.Ic #elif
expressions are passed through by default,
or they may be processed by specifying the
.Fl k
flag.
.Pp
The
.Nm
@ -153,6 +161,18 @@ is complemented,
i.e., the lines that would have been removed or blanked
are retained and vice versa.
.Pp
.It Fl k
Process
.Ic #if
and
.Ic #elif
lines with constant expressions.
By default, sections controlled by such lines are passed through unchanged
because they typically start
.Li #if 0
and are used as a kind of comment to sketch out future or past development.
It would be rude to strip them out, just as it would be for normal comments.
.Pp
.It Fl l
Replace removed lines with blank lines
instead of deleting them.

25
usr.bin/unifdef/unifdef.c
View File

@ -44,7 +44,7 @@ static const char copyright[] =
#ifdef __IDSTRING
__IDSTRING(Berkeley, "@(#)unifdef.c 8.1 (Berkeley) 6/6/93");
__IDSTRING(NetBSD, "$NetBSD: unifdef.c,v 1.8 2000/07/03 02:51:36 matt Exp $");
__IDSTRING(dotat, "$dotat: things/unifdef.c,v 1.73 2002/05/21 17:33:41 fanf Exp $");
__IDSTRING(dotat, "$dotat: things/unifdef.c,v 1.75 2002/09/24 19:16:29 fanf2 Exp $");
#endif
#ifdef __FBSDID
__FBSDID("$FreeBSD$");
@ -184,6 +184,7 @@ const char *filename;
int linenum; /* current line number */
int stifline; /* start of current #if */
int stqcline; /* start of current coment or quote */
bool keepthis; /* ignore this #if's value 'cause it's const */
#define MAXLINE 1024
#define KWSIZE 8
@ -193,6 +194,7 @@ char *keyword; /* used for editing #elif's */
bool complement; /* -c option in effect: do the complement */
bool debugging; /* -d option in effect: debugging reports */
bool killconsts; /* -k option in effect: eval constant #ifs */
bool lnblank; /* -l option in effect: blank deleted lines */
bool symlist; /* -s option in effect: output symbol list */
bool text; /* -t option in effect: this is a text file */
@ -222,6 +224,7 @@ int findsym(const char *);
void flushline(bool);
int getline(char *, int, FILE *, bool);
Linetype ifeval(const char **);
int main(int, char **);
const char *skipcomment(const char *);
const char *skipquote(const char *, Quote_state);
const char *skipsym(const char *);
@ -234,7 +237,7 @@ main(int argc, char *argv[])
{
int opt;
while ((opt = getopt(argc, argv, "i:D:U:I:cdlst")) != -1)
while ((opt = getopt(argc, argv, "i:D:U:I:cdklst")) != -1)
switch (opt) {
case 'i': /* treat stuff controlled by these symbols as text */
/*
@ -262,6 +265,9 @@ main(int argc, char *argv[])
case 'c': /* treat -D as -U and vice versa */
complement = true;
break;
case 'k': /* process constant #ifs */
killconsts = true;
break;
case 'd':
debugging = true;
break;
@ -305,7 +311,7 @@ void
usage(void)
{
fprintf (stderr, "usage: %s",
"unifdef [-cdlst] [[-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym]] ... [file]\n");
"unifdef [-cdklst] [[-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym]] ... [file]\n");
exit (2);
}
@ -535,20 +541,20 @@ checkline(int *cursym)
} else if (strcmp(kw, "if") == 0) {
retval = ifeval(&cp);
cp = skipcomment(cp);
if (*cp != '\n')
if (*cp != '\n' || keepthis)
retval = LT_IF;
*cursym = 0;
} else if (strcmp(kw, "elif") == 0) {
retval = ifeval(&cp);
cp = skipcomment(cp);
if (*cp != '\n' || keepthis)
retval = LT_ELIF;
if (retval == LT_IF)
retval = LT_ELIF;
if (retval == LT_TRUE)
retval = LT_ELTRUE;
if (retval == LT_FALSE)
retval = LT_ELFALSE;
if (*cp != '\n')
retval = LT_ELIF;
*cursym = 0;
} else if (strcmp(kw, "else") == 0)
retval = LT_ELSE;
@ -605,6 +611,7 @@ elif2endif(void)
/*
* Function for evaluating the innermost parts of expressions,
* viz. !expr (expr) defined(symbol) symbol number
* We reset the keepthis flag when we find a non-constant subexpression.
*/
Linetype
eval_unary(struct ops *ops, int *valp, const char **cpp)
@ -646,6 +653,7 @@ eval_unary(struct ops *ops, int *valp, const char **cpp)
cp = skipcomment(cp);
if (*cp++ != ')')
return LT_IF;
keepthis = false;
} else if (!endsym(*cp)) {
debug("eval%d symbol", ops - eval_ops);
sym = findsym(cp);
@ -659,6 +667,7 @@ eval_unary(struct ops *ops, int *valp, const char **cpp)
return LT_IF;
}
cp = skipsym(cp);
keepthis = false;
} else
return LT_IF;
@ -703,13 +712,15 @@ eval_table(struct ops *ops, int *valp, const char **cpp)
/*
* Evaluate the expression on a #if or #elif line. If we can work out
* the result we return LT_TRUE or LT_FALSE accordingly, otherwise we
* return just a generic LT_IF.
* return just a generic LT_IF. If the expression is constant and
* we are not processing constant #ifs then the keepthis flag is true.
*/
Linetype
ifeval(const char **cpp)
{
int val;
debug("eval %s", *cpp);
keepthis = killconsts ? false : true;
return eval_table(eval_ops, &val, cpp);
}