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提交 d8379ab1 编写于 作者: T Tony Finch 提交者： Michal Marek
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unifdef: update to upstream revision 1.190 

Fix handling of input files (e.g. with no newline at EOF) that could
make unifdef get into an unexpected state and call abort().

The new -B option compresses blank lines around a deleted section
so that blank lines around "paragraphs" of code don't get doubled.

The evaluator can now handle macros with arguments, and unbracketed
arguments to the "defined" operator.

Add myself to MAINTAINERS for unifdef.
Signed-off-by: NTony Finch <dot@dotat.at>
Acked-by: NSam Ravnborg <sam@ravnborg.org>
Signed-off-by: NMichal Marek <mmarek@suse.cz>
上级 eb8f844c
隐藏空白更改
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MAINTAINERS
浏览文件 @ d8379ab1
...@@ -5407,6 +5407,12 @@ F: drivers/uwb/* ...@@ -5407,6 +5407,12 @@ F: drivers/uwb/*
F: include/linux/uwb.h F: include/linux/uwb.h
F: include/linux/uwb/ F: include/linux/uwb/
UNIFDEF
M: Tony Finch <dot@dotat.at>
W: http://dotat.at/prog/unifdef
S: Maintained
F: scripts/unifdef.c
UNIFORM CDROM DRIVER UNIFORM CDROM DRIVER
M: Jens Axboe <axboe@kernel.dk> M: Jens Axboe <axboe@kernel.dk>
W: http://www.kernel.dk W: http://www.kernel.dk
......
scripts/unifdef.c
浏览文件 @ d8379ab1
/* /*
* Copyright (c) 2002 - 2005 Tony Finch <dot@dotat.at>. All rights reserved. * Copyright (c) 2002 - 2009 Tony Finch <dot@dotat.at>
*
* This code is derived from software contributed to Berkeley by Dave Yost.
* It was rewritten to support ANSI C by Tony Finch. The original version of
* unifdef carried the following copyright notice. None of its code remains
* in this version (though some of the names remain).
*
* Copyright (c) 1985, 1993
* The Regents of the University of California. All rights reserved.
* *
* Redistribution and use in source and binary forms, with or without * Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions * modification, are permitted provided that the following conditions
...@@ -31,23 +23,20 @@ ...@@ -31,23 +23,20 @@
* SUCH DAMAGE. * SUCH DAMAGE.
*/ */
#include <sys/cdefs.h> /*
* This code was derived from software contributed to Berkeley by Dave Yost.
* It was rewritten to support ANSI C by Tony Finch. The original version
* of unifdef carried the 4-clause BSD copyright licence. None of its code
* remains in this version (though some of the names remain) so it now
* carries a more liberal licence.
*
* The latest version is available from http://dotat.at/prog/unifdef
*/
#ifndef lint static const char * const copyright[] = {
#if 0 "@(#) Copyright (c) 2002 - 2009 Tony Finch <dot@dotat.at>\n",
static const char copyright[] = "$dotat: unifdef/unifdef.c,v 1.190 2009/11/27 17:21:26 fanf2 Exp $",
"@(#) Copyright (c) 1985, 1993\n\ };
The Regents of the University of California. All rights reserved.\n";
#endif
#ifdef __IDSTRING
__IDSTRING(Berkeley, "@(#)unifdef.c 8.1 (Berkeley) 6/6/93");
__IDSTRING(NetBSD, "$NetBSD: unifdef.c,v 1.8 2000/07/03 02:51:36 matt Exp $");
__IDSTRING(dotat, "$dotat: things/unifdef.c,v 1.171 2005/03/08 12:38:48 fanf2 Exp $");
#endif
#endif /* not lint */
#ifdef __FBSDID
__FBSDID("$FreeBSD: /repoman/r/ncvs/src/usr.bin/unifdef/unifdef.c,v 1.20 2005/05/21 09:55:09 ru Exp $");
#endif
/* /*
* unifdef - remove ifdef'ed lines * unifdef - remove ifdef'ed lines
...@@ -72,8 +61,6 @@ __FBSDID("$FreeBSD: /repoman/r/ncvs/src/usr.bin/unifdef/unifdef.c,v 1.20 2005/05 ...@@ -72,8 +61,6 @@ __FBSDID("$FreeBSD: /repoman/r/ncvs/src/usr.bin/unifdef/unifdef.c,v 1.20 2005/05
#include <string.h> #include <string.h>
#include <unistd.h> #include <unistd.h>
size_t strlcpy(char *dst, const char *src, size_t siz);
/* types of input lines: */ /* types of input lines: */
typedef enum { typedef enum {
LT_TRUEI, /* a true #if with ignore flag */ LT_TRUEI, /* a true #if with ignore flag */
...@@ -90,6 +77,7 @@ typedef enum { ...@@ -90,6 +77,7 @@ typedef enum {
LT_DODGY_LAST = LT_DODGY + LT_ENDIF, LT_DODGY_LAST = LT_DODGY + LT_ENDIF,
LT_PLAIN, /* ordinary line */ LT_PLAIN, /* ordinary line */
LT_EOF, /* end of file */ LT_EOF, /* end of file */
LT_ERROR, /* unevaluable #if */
LT_COUNT LT_COUNT
} Linetype; } Linetype;
...@@ -100,7 +88,7 @@ static char const * const linetype_name[] = { ...@@ -100,7 +88,7 @@ static char const * const linetype_name[] = {
"DODGY IF", "DODGY TRUE", "DODGY FALSE", "DODGY IF", "DODGY TRUE", "DODGY FALSE",
"DODGY ELIF", "DODGY ELTRUE", "DODGY ELFALSE", "DODGY ELIF", "DODGY ELTRUE", "DODGY ELFALSE",
"DODGY ELSE", "DODGY ENDIF", "DODGY ELSE", "DODGY ENDIF",
"PLAIN", "EOF" "PLAIN", "EOF", "ERROR"
}; };
/* state of #if processing */ /* state of #if processing */
...@@ -168,11 +156,13 @@ static char const * const linestate_name[] = { ...@@ -168,11 +156,13 @@ static char const * const linestate_name[] = {
* Globals. * Globals.
*/ */
static bool compblank; /* -B: compress blank lines */
static bool lnblank; /* -b: blank deleted lines */
static bool complement; /* -c: do the complement */ static bool complement; /* -c: do the complement */
static bool debugging; /* -d: debugging reports */ static bool debugging; /* -d: debugging reports */
static bool iocccok; /* -e: fewer IOCCC errors */ static bool iocccok; /* -e: fewer IOCCC errors */
static bool strictlogic; /* -K: keep ambiguous #ifs */
static bool killconsts; /* -k: eval constant #ifs */ static bool killconsts; /* -k: eval constant #ifs */
static bool lnblank; /* -l: blank deleted lines */
static bool lnnum; /* -n: add #line directives */ static bool lnnum; /* -n: add #line directives */
static bool symlist; /* -s: output symbol list */ static bool symlist; /* -s: output symbol list */
static bool text; /* -t: this is a text file */ static bool text; /* -t: this is a text file */
...@@ -196,7 +186,9 @@ static bool ignoring[MAXDEPTH]; /* ignore comments state */ ...@@ -196,7 +186,9 @@ static bool ignoring[MAXDEPTH]; /* ignore comments state */
static int stifline[MAXDEPTH]; /* start of current #if */ static int stifline[MAXDEPTH]; /* start of current #if */
static int depth; /* current #if nesting */ static int depth; /* current #if nesting */
static int delcount; /* count of deleted lines */ static int delcount; /* count of deleted lines */
static bool keepthis; /* don't delete constant #if */ static unsigned blankcount; /* count of blank lines */
static unsigned blankmax; /* maximum recent blankcount */
static bool constexpr; /* constant #if expression */
static int exitstat; /* program exit status */ static int exitstat; /* program exit status */
...@@ -206,13 +198,14 @@ static void done(void); ...@@ -206,13 +198,14 @@ static void done(void);
static void error(const char *); static void error(const char *);
static int findsym(const char *); static int findsym(const char *);
static void flushline(bool); static void flushline(bool);
static Linetype get_line(void); static Linetype parseline(void);
static Linetype ifeval(const char **); static Linetype ifeval(const char **);
static void ignoreoff(void); static void ignoreoff(void);
static void ignoreon(void); static void ignoreon(void);
static void keywordedit(const char *); static void keywordedit(const char *);
static void nest(void); static void nest(void);
static void process(void); static void process(void);
static const char *skipargs(const char *);
static const char *skipcomment(const char *); static const char *skipcomment(const char *);
static const char *skipsym(const char *); static const char *skipsym(const char *);
static void state(Ifstate); static void state(Ifstate);
...@@ -220,7 +213,7 @@ static int strlcmp(const char *, const char *, size_t); ...@@ -220,7 +213,7 @@ static int strlcmp(const char *, const char *, size_t);
static void unnest(void); static void unnest(void);
static void usage(void); static void usage(void);
#define endsym(c) (!isalpha((unsigned char)c) && !isdigit((unsigned char)c) && c != '_') #define endsym(c) (!isalnum((unsigned char)c) && c != '_')
/* /*
* The main program. * The main program.
...@@ -230,7 +223,7 @@ main(int argc, char *argv[]) ...@@ -230,7 +223,7 @@ main(int argc, char *argv[])
{ {
int opt; int opt;
while ((opt = getopt(argc, argv, "i:D:U:I:cdeklnst")) != -1) while ((opt = getopt(argc, argv, "i:D:U:I:BbcdeKklnst")) != -1)
switch (opt) { switch (opt) {
case 'i': /* treat stuff controlled by these symbols as text */ case 'i': /* treat stuff controlled by these symbols as text */
/* /*
...@@ -255,6 +248,13 @@ main(int argc, char *argv[]) ...@@ -255,6 +248,13 @@ main(int argc, char *argv[])
case 'I': case 'I':
/* no-op for compatibility with cpp */ /* no-op for compatibility with cpp */
break; break;
case 'B': /* compress blank lines around removed section */
compblank = true;
break;
case 'b': /* blank deleted lines instead of omitting them */
case 'l': /* backwards compatibility */
lnblank = true;
break;
case 'c': /* treat -D as -U and vice versa */ case 'c': /* treat -D as -U and vice versa */
complement = true; complement = true;
break; break;
...@@ -264,12 +264,12 @@ main(int argc, char *argv[]) ...@@ -264,12 +264,12 @@ main(int argc, char *argv[])
case 'e': /* fewer errors from dodgy lines */ case 'e': /* fewer errors from dodgy lines */
iocccok = true; iocccok = true;
break; break;
case 'K': /* keep ambiguous #ifs */
strictlogic = true;
break;
case 'k': /* process constant #ifs */ case 'k': /* process constant #ifs */
killconsts = true; killconsts = true;
break; break;
case 'l': /* blank deleted lines instead of omitting them */
lnblank = true;
break;
case 'n': /* add #line directive after deleted lines */ case 'n': /* add #line directive after deleted lines */
lnnum = true; lnnum = true;
break; break;
...@@ -284,6 +284,8 @@ main(int argc, char *argv[]) ...@@ -284,6 +284,8 @@ main(int argc, char *argv[])
} }
argc -= optind; argc -= optind;
argv += optind; argv += optind;
if (compblank && lnblank)
errx(2, "-B and -b are mutually exclusive");
if (argc > 1) { if (argc > 1) {
errx(2, "can only do one file"); errx(2, "can only do one file");
} else if (argc == 1 && strcmp(*argv, "-") != 0) { } else if (argc == 1 && strcmp(*argv, "-") != 0) {
...@@ -302,7 +304,7 @@ main(int argc, char *argv[]) ...@@ -302,7 +304,7 @@ main(int argc, char *argv[])
static void static void
usage(void) usage(void)
{ {
fprintf(stderr, "usage: unifdef [-cdeklnst] [-Ipath]" fprintf(stderr, "usage: unifdef [-BbcdeKknst] [-Ipath]"
" [-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym] ... [file]\n"); " [-Dsym[=val]] [-Usym] [-iDsym[=val]] [-iUsym] ... [file]\n");
exit(2); exit(2);
} }
...@@ -383,46 +385,46 @@ static state_fn * const trans_table[IS_COUNT][LT_COUNT] = { ...@@ -383,46 +385,46 @@ static state_fn * const trans_table[IS_COUNT][LT_COUNT] = {
/* IS_OUTSIDE */ /* IS_OUTSIDE */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Eendif, { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Eendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eendif,
print, done }, print, done, abort },
/* IS_FALSE_PREFIX */ /* IS_FALSE_PREFIX */
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Strue, Sfalse,Selse, Dendif, { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Strue, Sfalse,Selse, Dendif,
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Eioccc,Eioccc,Eioccc,Eioccc, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Mpass, Eioccc,Eioccc,Eioccc,Eioccc,
drop, Eeof }, drop, Eeof, abort },
/* IS_TRUE_PREFIX */ /* IS_TRUE_PREFIX */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Dfalse,Dfalse,Dfalse,Delse, Dendif, { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Dfalse,Dfalse,Dfalse,Delse, Dendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc, Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc,
print, Eeof }, print, Eeof, abort },
/* IS_PASS_MIDDLE */ /* IS_PASS_MIDDLE */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Pelif, Mtrue, Delif, Pelse, Pendif, { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Pelif, Mtrue, Delif, Pelse, Pendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Pelif, Oelif, Oelif, Pelse, Pendif, Oiffy, Oiffy, Fpass, Oif, Oif, Pelif, Oelif, Oelif, Pelse, Pendif,
print, Eeof }, print, Eeof, abort },
/* IS_FALSE_MIDDLE */ /* IS_FALSE_MIDDLE */
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Pelif, Mtrue, Delif, Pelse, Pendif, { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Pelif, Mtrue, Delif, Pelse, Pendif,
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eioccc,Eioccc,Eioccc,Eioccc,Eioccc,
drop, Eeof }, drop, Eeof, abort },
/* IS_TRUE_MIDDLE */ /* IS_TRUE_MIDDLE */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Melif, Melif, Melif, Melse, Pendif, { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Melif, Melif, Melif, Melse, Pendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Pendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eioccc,Eioccc,Eioccc,Eioccc,Pendif,
print, Eeof }, print, Eeof, abort },
/* IS_PASS_ELSE */ /* IS_PASS_ELSE */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Pendif, { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Pendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Pendif, Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Pendif,
print, Eeof }, print, Eeof, abort },
/* IS_FALSE_ELSE */ /* IS_FALSE_ELSE */
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Dendif, { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Dendif,
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Eioccc, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Eelif, Eelif, Eelif, Eelse, Eioccc,
drop, Eeof }, drop, Eeof, abort },
/* IS_TRUE_ELSE */ /* IS_TRUE_ELSE */
{ Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Dendif, { Itrue, Ifalse,Fpass, Ftrue, Ffalse,Eelif, Eelif, Eelif, Eelse, Dendif,
Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eioccc, Oiffy, Oiffy, Fpass, Oif, Oif, Eelif, Eelif, Eelif, Eelse, Eioccc,
print, Eeof }, print, Eeof, abort },
/* IS_FALSE_TRAILER */ /* IS_FALSE_TRAILER */
{ Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Dendif, { Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Dendif,
Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Eioccc, Idrop, Idrop, Fdrop, Fdrop, Fdrop, Dfalse,Dfalse,Dfalse,Delse, Eioccc,
drop, Eeof } drop, Eeof, abort }
/*TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF /*TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF
TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF (DODGY) TRUEI FALSEI IF TRUE FALSE ELIF ELTRUE ELFALSE ELSE ENDIF (DODGY)
PLAIN EOF */ PLAIN EOF ERROR */
}; };
/* /*
...@@ -463,9 +465,11 @@ keywordedit(const char *replacement) ...@@ -463,9 +465,11 @@ keywordedit(const char *replacement)
static void static void
nest(void) nest(void)
{ {
depth += 1; if (depth > MAXDEPTH-1)
if (depth >= MAXDEPTH) abort(); /* bug */
if (depth == MAXDEPTH-1)
error("Too many levels of nesting"); error("Too many levels of nesting");
depth += 1;
stifline[depth] = linenum; stifline[depth] = linenum;
} }
static void static void
...@@ -490,15 +494,23 @@ flushline(bool keep) ...@@ -490,15 +494,23 @@ flushline(bool keep)
if (symlist) if (symlist)
return; return;
if (keep ^ complement) { if (keep ^ complement) {
if (lnnum && delcount > 0) bool blankline = tline[strspn(tline, " \t\n")] == '\0';
printf("#line %d\n", linenum); if (blankline && compblank && blankcount != blankmax) {
fputs(tline, stdout); delcount += 1;
delcount = 0; blankcount += 1;
} else {
if (lnnum && delcount > 0)
printf("#line %d\n", linenum);
fputs(tline, stdout);
delcount = 0;
blankmax = blankcount = blankline ? blankcount + 1 : 0;
}
} else { } else {
if (lnblank) if (lnblank)
putc('\n', stdout); putc('\n', stdout);
exitstat = 1; exitstat = 1;
delcount += 1; delcount += 1;
blankcount = 0;
} }
} }
...@@ -510,9 +522,12 @@ process(void) ...@@ -510,9 +522,12 @@ process(void)
{ {
Linetype lineval; Linetype lineval;
/* When compressing blank lines, act as if the file
is preceded by a large number of blank lines. */
blankmax = blankcount = 1000;
for (;;) { for (;;) {
linenum++; linenum++;
lineval = get_line(); lineval = parseline();
trans_table[ifstate[depth]][lineval](); trans_table[ifstate[depth]][lineval]();
debug("process %s -> %s depth %d", debug("process %s -> %s depth %d",
linetype_name[lineval], linetype_name[lineval],
...@@ -526,7 +541,7 @@ process(void) ...@@ -526,7 +541,7 @@ process(void)
* help from skipcomment(). * help from skipcomment().
*/ */
static Linetype static Linetype
get_line(void) parseline(void)
{ {
const char *cp; const char *cp;
int cursym; int cursym;
...@@ -595,9 +610,21 @@ get_line(void) ...@@ -595,9 +610,21 @@ get_line(void)
if (incomment) if (incomment)
linestate = LS_DIRTY; linestate = LS_DIRTY;
} }
/* skipcomment should have changed the state */ /* skipcomment normally changes the state, except
if (linestate == LS_HASH) if the last line of the file lacks a newline, or
abort(); /* bug */ if there is too much whitespace in a directive */
if (linestate == LS_HASH) {
size_t len = cp - tline;
if (fgets(tline + len, MAXLINE - len, input) == NULL) {
/* append the missing newline */
tline[len+0] = '\n';
tline[len+1] = '\0';
cp++;
linestate = LS_START;
} else {
linestate = LS_DIRTY;
}
}
} }
if (linestate == LS_DIRTY) { if (linestate == LS_DIRTY) {
while (*cp != '\0') while (*cp != '\0')
...@@ -610,17 +637,40 @@ get_line(void) ...@@ -610,17 +637,40 @@ get_line(void)
/* /*
* These are the binary operators that are supported by the expression * These are the binary operators that are supported by the expression
* evaluator. Note that if support for division is added then we also * evaluator.
* need short-circuiting booleans because of divide-by-zero.
*/ */
static int op_lt(int a, int b) { return (a < b); } static Linetype op_strict(int *p, int v, Linetype at, Linetype bt) {
static int op_gt(int a, int b) { return (a > b); } if(at == LT_IF || bt == LT_IF) return (LT_IF);
static int op_le(int a, int b) { return (a <= b); } return (*p = v, v ? LT_TRUE : LT_FALSE);
static int op_ge(int a, int b) { return (a >= b); } }
static int op_eq(int a, int b) { return (a == b); } static Linetype op_lt(int *p, Linetype at, int a, Linetype bt, int b) {
static int op_ne(int a, int b) { return (a != b); } return op_strict(p, a < b, at, bt);
static int op_or(int a, int b) { return (a || b); } }
static int op_and(int a, int b) { return (a && b); } static Linetype op_gt(int *p, Linetype at, int a, Linetype bt, int b) {
return op_strict(p, a > b, at, bt);
}
static Linetype op_le(int *p, Linetype at, int a, Linetype bt, int b) {
return op_strict(p, a <= b, at, bt);
}
static Linetype op_ge(int *p, Linetype at, int a, Linetype bt, int b) {
return op_strict(p, a >= b, at, bt);
}
static Linetype op_eq(int *p, Linetype at, int a, Linetype bt, int b) {
return op_strict(p, a == b, at, bt);
}
static Linetype op_ne(int *p, Linetype at, int a, Linetype bt, int b) {
return op_strict(p, a != b, at, bt);
}
static Linetype op_or(int *p, Linetype at, int a, Linetype bt, int b) {
if (!strictlogic && (at == LT_TRUE || bt == LT_TRUE))
return (*p = 1, LT_TRUE);
return op_strict(p, a || b, at, bt);
}
static Linetype op_and(int *p, Linetype at, int a, Linetype bt, int b) {
if (!strictlogic && (at == LT_FALSE || bt == LT_FALSE))
return (*p = 0, LT_FALSE);
return op_strict(p, a && b, at, bt);
}
/* /*
* An evaluation function takes three arguments, as follows: (1) a pointer to * An evaluation function takes three arguments, as follows: (1) a pointer to
...@@ -629,8 +679,8 @@ static int op_and(int a, int b) { return (a && b); } ...@@ -629,8 +679,8 @@ static int op_and(int a, int b) { return (a && b); }
* value of the expression; and (3) a pointer to a char* that points to the * value of the expression; and (3) a pointer to a char* that points to the
* expression to be evaluated and that is updated to the end of the expression * expression to be evaluated and that is updated to the end of the expression
* when evaluation is complete. The function returns LT_FALSE if the value of * when evaluation is complete. The function returns LT_FALSE if the value of
* the expression is zero, LT_TRUE if it is non-zero, or LT_IF if the * the expression is zero, LT_TRUE if it is non-zero, LT_IF if the expression
* expression could not be evaluated. * depends on an unknown symbol, or LT_ERROR if there is a parse failure.
*/ */
struct ops; struct ops;
...@@ -649,7 +699,7 @@ static const struct ops { ...@@ -649,7 +699,7 @@ static const struct ops {
eval_fn *inner; eval_fn *inner;
struct op { struct op {
const char *str; const char *str;
int (*fn)(int, int); Linetype (*fn)(int *, Linetype, int, Linetype, int);
} op[5]; } op[5];
} eval_ops[] = { } eval_ops[] = {
{ eval_table, { { "||", op_or } } }, { eval_table, { { "||", op_or } } },
...@@ -664,8 +714,8 @@ static const struct ops { ...@@ -664,8 +714,8 @@ static const struct ops {
/* /*
* Function for evaluating the innermost parts of expressions, * Function for evaluating the innermost parts of expressions,
* viz. !expr (expr) defined(symbol) symbol number * viz. !expr (expr) number defined(symbol) symbol
* We reset the keepthis flag when we find a non-constant subexpression. * We reset the constexpr flag in the last two cases.
*/ */
static Linetype static Linetype
eval_unary(const struct ops *ops, int *valp, const char **cpp) eval_unary(const struct ops *ops, int *valp, const char **cpp)
...@@ -673,68 +723,83 @@ eval_unary(const struct ops *ops, int *valp, const char **cpp) ...@@ -673,68 +723,83 @@ eval_unary(const struct ops *ops, int *valp, const char **cpp)
const char *cp; const char *cp;
char *ep; char *ep;
int sym; int sym;
bool defparen;
Linetype lt;
cp = skipcomment(*cpp); cp = skipcomment(*cpp);
if (*cp == '!') { if (*cp == '!') {
debug("eval%d !", ops - eval_ops); debug("eval%d !", ops - eval_ops);
cp++; cp++;
if (eval_unary(ops, valp, &cp) == LT_IF) { lt = eval_unary(ops, valp, &cp);
*cpp = cp; if (lt == LT_ERROR)
return (LT_IF); return (LT_ERROR);
if (lt != LT_IF) {
*valp = !*valp;
lt = *valp ? LT_TRUE : LT_FALSE;
} }
*valp = !*valp;
} else if (*cp == '(') { } else if (*cp == '(') {
cp++; cp++;
debug("eval%d (", ops - eval_ops); debug("eval%d (", ops - eval_ops);
if (eval_table(eval_ops, valp, &cp) == LT_IF) lt = eval_table(eval_ops, valp, &cp);
return (LT_IF); if (lt == LT_ERROR)
return (LT_ERROR);
cp = skipcomment(cp); cp = skipcomment(cp);
if (*cp++ != ')') if (*cp++ != ')')
return (LT_IF); return (LT_ERROR);
} else if (isdigit((unsigned char)*cp)) { } else if (isdigit((unsigned char)*cp)) {
debug("eval%d number", ops - eval_ops); debug("eval%d number", ops - eval_ops);
*valp = strtol(cp, &ep, 0); *valp = strtol(cp, &ep, 0);
if (ep == cp)
return (LT_ERROR);
lt = *valp ? LT_TRUE : LT_FALSE;
cp = skipsym(cp); cp = skipsym(cp);
} else if (strncmp(cp, "defined", 7) == 0 && endsym(cp[7])) { } else if (strncmp(cp, "defined", 7) == 0 && endsym(cp[7])) {
cp = skipcomment(cp+7); cp = skipcomment(cp+7);
debug("eval%d defined", ops - eval_ops); debug("eval%d defined", ops - eval_ops);
if (*cp++ != '(') if (*cp == '(') {
return (LT_IF); cp = skipcomment(cp+1);
cp = skipcomment(cp); defparen = true;
} else {
defparen = false;
}
sym = findsym(cp); sym = findsym(cp);
cp = skipsym(cp); if (sym < 0) {
cp = skipcomment(cp); lt = LT_IF;
if (*cp++ != ')') } else {
return (LT_IF);
if (sym >= 0)
*valp = (value[sym] != NULL); *valp = (value[sym] != NULL);
else { lt = *valp ? LT_TRUE : LT_FALSE;
*cpp = cp;
return (LT_IF);
} }
keepthis = false; cp = skipsym(cp);
cp = skipcomment(cp);
if (defparen && *cp++ != ')')
return (LT_ERROR);
constexpr = false;
} else if (!endsym(*cp)) { } else if (!endsym(*cp)) {
debug("eval%d symbol", ops - eval_ops); debug("eval%d symbol", ops - eval_ops);
sym = findsym(cp); sym = findsym(cp);
if (sym < 0) cp = skipsym(cp);
return (LT_IF); if (sym < 0) {
if (value[sym] == NULL) lt = LT_IF;
cp = skipargs(cp);
} else if (value[sym] == NULL) {
*valp = 0; *valp = 0;
else { lt = LT_FALSE;
} else {
*valp = strtol(value[sym], &ep, 0); *valp = strtol(value[sym], &ep, 0);
if (*ep != '\0' || ep == value[sym]) if (*ep != '\0' || ep == value[sym])
return (LT_IF); return (LT_ERROR);
lt = *valp ? LT_TRUE : LT_FALSE;
cp = skipargs(cp);
} }
cp = skipsym(cp); constexpr = false;
keepthis = false;
} else { } else {
debug("eval%d bad expr", ops - eval_ops); debug("eval%d bad expr", ops - eval_ops);
return (LT_IF); return (LT_ERROR);
} }
*cpp = cp; *cpp = cp;
debug("eval%d = %d", ops - eval_ops, *valp); debug("eval%d = %d", ops - eval_ops, *valp);
return (*valp ? LT_TRUE : LT_FALSE); return (lt);
} }
/* /*
...@@ -746,11 +811,13 @@ eval_table(const struct ops *ops, int *valp, const char **cpp) ...@@ -746,11 +811,13 @@ eval_table(const struct ops *ops, int *valp, const char **cpp)
const struct op *op; const struct op *op;
const char *cp; const char *cp;
int val; int val;
Linetype lhs, rhs; Linetype lt, rt;
debug("eval%d", ops - eval_ops); debug("eval%d", ops - eval_ops);
cp = *cpp; cp = *cpp;
lhs = ops->inner(ops+1, valp, &cp); lt = ops->inner(ops+1, valp, &cp);
if (lt == LT_ERROR)
return (LT_ERROR);
for (;;) { for (;;) {
cp = skipcomment(cp); cp = skipcomment(cp);
for (op = ops->op; op->str != NULL; op++) for (op = ops->op; op->str != NULL; op++)
...@@ -760,32 +827,16 @@ eval_table(const struct ops *ops, int *valp, const char **cpp) ...@@ -760,32 +827,16 @@ eval_table(const struct ops *ops, int *valp, const char **cpp)
break; break;
cp += strlen(op->str); cp += strlen(op->str);
debug("eval%d %s", ops - eval_ops, op->str); debug("eval%d %s", ops - eval_ops, op->str);
rhs = ops->inner(ops+1, &val, &cp); rt = ops->inner(ops+1, &val, &cp);
if (op->fn == op_and && (lhs == LT_FALSE || rhs == LT_FALSE)) { if (rt == LT_ERROR)
debug("eval%d: and always false", ops - eval_ops); return (LT_ERROR);
if (lhs == LT_IF) lt = op->fn(valp, lt, *valp, rt, val);
*valp = val;
lhs = LT_FALSE;
continue;
}
if (op->fn == op_or && (lhs == LT_TRUE || rhs == LT_TRUE)) {
debug("eval%d: or always true", ops - eval_ops);
if (lhs == LT_IF)
*valp = val;
lhs = LT_TRUE;
continue;
}
if (rhs == LT_IF)
lhs = LT_IF;
if (lhs != LT_IF)
*valp = op->fn(*valp, val);
} }
*cpp = cp; *cpp = cp;
debug("eval%d = %d", ops - eval_ops, *valp); debug("eval%d = %d", ops - eval_ops, *valp);
if (lhs != LT_IF) debug("eval%d lt = %s", ops - eval_ops, linetype_name[lt]);
lhs = (*valp ? LT_TRUE : LT_FALSE); return (lt);
return lhs;
} }
/* /*
...@@ -796,17 +847,14 @@ eval_table(const struct ops *ops, int *valp, const char **cpp) ...@@ -796,17 +847,14 @@ eval_table(const struct ops *ops, int *valp, const char **cpp)
static Linetype static Linetype
ifeval(const char **cpp) ifeval(const char **cpp)
{ {
const char *cp = *cpp;
int ret; int ret;
int val; int val = 0;
debug("eval %s", *cpp); debug("eval %s", *cpp);
keepthis = killconsts ? false : true; constexpr = killconsts ? false : true;
ret = eval_table(eval_ops, &val, &cp); ret = eval_table(eval_ops, &val, cpp);
if (ret != LT_IF)
*cpp = cp;
debug("eval = %d", val); debug("eval = %d", val);
return (keepthis ? LT_IF : ret); return (constexpr ? LT_IF : ret == LT_ERROR ? LT_IF : ret);
} }
/* /*
...@@ -917,6 +965,31 @@ skipcomment(const char *cp) ...@@ -917,6 +965,31 @@ skipcomment(const char *cp)
return (cp); return (cp);
} }
/*
* Skip macro arguments.
*/
static const char *
skipargs(const char *cp)
{
const char *ocp = cp;
int level = 0;
cp = skipcomment(cp);
if (*cp != '(')
return (cp);
do {
if (*cp == '(')
level++;
if (*cp == ')')
level--;
cp = skipcomment(cp+1);
} while (level != 0 && *cp != '\0');
if (level == 0)
return (cp);
else
/* Rewind and re-detect the syntax error later. */
return (ocp);
}
/* /*
* Skip over an identifier. * Skip over an identifier.
*/ */
...@@ -929,7 +1002,7 @@ skipsym(const char *cp) ...@@ -929,7 +1002,7 @@ skipsym(const char *cp)
} }
/* /*
* Look for the symbol in the symbol table. If is is found, we return * Look for the symbol in the symbol table. If it is found, we return
* the symbol table index, else we return -1. * the symbol table index, else we return -1.
*/ */
static int static int
......
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