ccc5b4e6f4
Cast sizeof() to (int), as it's being compared against an int, not a size_t. If i is changed to a size_t, it means the logic must be slightly changed later in the flow, where --i is checked to be >= 0. I am not sure I want to make a logic change to account for clearing up a warning, when an aesthetic one will keep from modifying the logic. Other harmless casts, that I think I've made in the right directions. Make gpbc() an inline function, rather than an obfuscated macro, make its scratch space local, rather than global. The previous macro used a dirty hack (logical AND in place of a conditional) which would lead GCC to throw a fit (rightly so) as the logical check, as well as the incrementation of a variable, were not used for anything. const'ify a few places where gcc3 yells. xstrdup() some global consts in places where we xstrdup() when not using consts, but tried to assign them to non-consts before. Don't use execv(2) if we don't have the kind of arguments it wants. Reviewed by: asmodai obrien tjr Submitted by: tjr (a gcc3 build log)
619 lines
10 KiB
C
619 lines
10 KiB
C
/* $OpenBSD: expr.c,v 1.12 2002/02/16 21:27:48 millert Exp $ */
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/* $NetBSD: expr.c,v 1.7 1995/09/28 05:37:31 tls Exp $ */
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/*
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
|
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* Ozan Yigit at York University.
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*
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* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 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.
|
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* 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.
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|
* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
|
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* without specific prior written permission.
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|
*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*/
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|
|
|
#include <sys/cdefs.h>
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__SCCSID("@(#)expr.c 8.2 (Berkeley) 4/29/95");
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__RCSID_SOURCE("$OpenBSD: expr.c,v 1.12 2002/02/16 21:27:48 millert Exp $");
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__FBSDID("$FreeBSD$");
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|
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#include <sys/types.h>
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#include <ctype.h>
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|
#include <err.h>
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|
#include <stddef.h>
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#include <stdio.h>
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|
#include "mdef.h"
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|
#include "extern.h"
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|
|
|
/*
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|
* expression evaluator: performs a standard recursive
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|
* descent parse to evaluate any expression permissible
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|
* within the following grammar:
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|
*
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* expr : query EOS
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* query : lor
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|
* | lor "?" query ":" query
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|
* lor : land { "||" land }
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* land : not { "&&" not }
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* not : eqrel
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* | '!' not
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|
* eqrel : shift { eqrelop shift }
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* shift : primary { shop primary }
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* primary : term { addop term }
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* term : exp { mulop exp }
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* exp : unary { expop unary }
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* unary : factor
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|
* | unop unary
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* factor : constant
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|
* | "(" query ")"
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* constant: num
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|
* | "'" CHAR "'"
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* num : DIGIT
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|
* | DIGIT num
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* shop : "<<"
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|
* | ">>"
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* eqrel : "="
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|
* | "=="
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|
* | "!="
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|
* | "<"
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|
* | ">"
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|
* | "<="
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|
* | ">="
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|
*
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|
*
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|
* This expression evaluator is lifted from a public-domain
|
|
* C Pre-Processor included with the DECUS C Compiler distribution.
|
|
* It is hacked somewhat to be suitable for m4.
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|
*
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|
* Originally by: Mike Lutz
|
|
* Bob Harper
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|
*/
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|
|
|
#define EQL 0
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|
#define NEQ 1
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|
#define LSS 2
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|
#define LEQ 3
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|
#define GTR 4
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|
#define GEQ 5
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|
#define OCTAL 8
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|
#define DECIMAL 10
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|
#define HEX 16
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|
|
|
static const char *nxtch; /* Parser scan pointer */
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|
static const char *where;
|
|
|
|
static int query(void);
|
|
static int lor(void);
|
|
static int land(void);
|
|
static int not(void);
|
|
static int eqrel(void);
|
|
static int shift(void);
|
|
static int primary(void);
|
|
static int term(void);
|
|
static int exp(void);
|
|
static int unary(void);
|
|
static int factor(void);
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|
static int constant(void);
|
|
static int num(void);
|
|
static int geteqrel(void);
|
|
static int skipws(void);
|
|
static void experr(const char *);
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|
|
|
/*
|
|
* For longjmp
|
|
*/
|
|
#include <setjmp.h>
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|
static jmp_buf expjump;
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|
|
|
/*
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|
* macros:
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* ungetch - Put back the last character examined.
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* getch - return the next character from expr string.
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|
*/
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|
#define ungetch() nxtch--
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|
#define getch() *nxtch++
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|
|
|
int
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|
expr(expbuf)
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|
const char *expbuf;
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|
{
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|
int rval;
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|
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|
nxtch = expbuf;
|
|
where = expbuf;
|
|
if (setjmp(expjump) != 0)
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|
return FALSE;
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|
|
|
rval = query();
|
|
if (skipws() == EOS)
|
|
return rval;
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|
|
|
printf("m4: ill-formed expression.\n");
|
|
return FALSE;
|
|
}
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|
|
|
/*
|
|
* query : lor | lor '?' query ':' query
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|
*/
|
|
static int
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|
query()
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|
{
|
|
int bool, true_val, false_val;
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|
|
|
bool = lor();
|
|
if (skipws() != '?') {
|
|
ungetch();
|
|
return bool;
|
|
}
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|
|
|
true_val = query();
|
|
if (skipws() != ':')
|
|
experr("bad query");
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|
|
|
false_val = query();
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|
return bool ? true_val : false_val;
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|
}
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|
|
|
/*
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|
* lor : land { '||' land }
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|
*/
|
|
static int
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|
lor()
|
|
{
|
|
int c, vl, vr;
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|
|
|
vl = land();
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|
while ((c = skipws()) == '|') {
|
|
if (getch() != '|')
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|
ungetch();
|
|
vr = land();
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|
vl = vl || vr;
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|
}
|
|
|
|
ungetch();
|
|
return vl;
|
|
}
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|
|
|
/*
|
|
* land : not { '&&' not }
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|
*/
|
|
static int
|
|
land()
|
|
{
|
|
int c, vl, vr;
|
|
|
|
vl = not();
|
|
while ((c = skipws()) == '&') {
|
|
if (getch() != '&')
|
|
ungetch();
|
|
vr = not();
|
|
vl = vl && vr;
|
|
}
|
|
|
|
ungetch();
|
|
return vl;
|
|
}
|
|
|
|
/*
|
|
* not : eqrel | '!' not
|
|
*/
|
|
static int
|
|
not()
|
|
{
|
|
int val, c;
|
|
|
|
if ((c = skipws()) == '!' && getch() != '=') {
|
|
ungetch();
|
|
val = not();
|
|
return !val;
|
|
}
|
|
|
|
if (c == '!')
|
|
ungetch();
|
|
ungetch();
|
|
return eqrel();
|
|
}
|
|
|
|
/*
|
|
* eqrel : shift { eqrelop shift }
|
|
*/
|
|
static int
|
|
eqrel()
|
|
{
|
|
int vl, vr, eqrelval;
|
|
|
|
vl = shift();
|
|
while ((eqrelval = geteqrel()) != -1) {
|
|
vr = shift();
|
|
|
|
switch (eqrelval) {
|
|
case EQL:
|
|
vl = (vl == vr);
|
|
break;
|
|
case NEQ:
|
|
vl = (vl != vr);
|
|
break;
|
|
case LEQ:
|
|
vl = (vl <= vr);
|
|
break;
|
|
case LSS:
|
|
vl = (vl < vr);
|
|
break;
|
|
case GTR:
|
|
vl = (vl > vr);
|
|
break;
|
|
case GEQ:
|
|
vl = (vl >= vr);
|
|
break;
|
|
}
|
|
}
|
|
return vl;
|
|
}
|
|
|
|
/*
|
|
* shift : primary { shop primary }
|
|
*/
|
|
static int
|
|
shift()
|
|
{
|
|
int vl, vr, c;
|
|
|
|
vl = primary();
|
|
while (((c = skipws()) == '<' || c == '>') && getch() == c) {
|
|
vr = primary();
|
|
|
|
if (c == '<')
|
|
vl <<= vr;
|
|
else
|
|
vl >>= vr;
|
|
}
|
|
|
|
if (c == '<' || c == '>')
|
|
ungetch();
|
|
ungetch();
|
|
return vl;
|
|
}
|
|
|
|
/*
|
|
* primary : term { addop term }
|
|
*/
|
|
static int
|
|
primary()
|
|
{
|
|
int c, vl, vr;
|
|
|
|
vl = term();
|
|
while ((c = skipws()) == '+' || c == '-') {
|
|
vr = term();
|
|
|
|
if (c == '+')
|
|
vl += vr;
|
|
else
|
|
vl -= vr;
|
|
}
|
|
|
|
ungetch();
|
|
return vl;
|
|
}
|
|
|
|
/*
|
|
* <term> := <exp> { <mulop> <exp> }
|
|
*/
|
|
static int
|
|
term()
|
|
{
|
|
int c, vl, vr;
|
|
|
|
vl = exp();
|
|
while ((c = skipws()) == '*' || c == '/' || c == '%') {
|
|
vr = exp();
|
|
|
|
switch (c) {
|
|
case '*':
|
|
vl *= vr;
|
|
break;
|
|
case '/':
|
|
if (vr == 0)
|
|
errx(1, "division by zero in eval.");
|
|
else
|
|
vl /= vr;
|
|
break;
|
|
case '%':
|
|
if (vr == 0)
|
|
errx(1, "modulo zero in eval.");
|
|
else
|
|
vl %= vr;
|
|
break;
|
|
}
|
|
}
|
|
ungetch();
|
|
return vl;
|
|
}
|
|
|
|
/*
|
|
* <term> := <unary> { <expop> <unary> }
|
|
*/
|
|
static int
|
|
exp()
|
|
{
|
|
int c, vl, vr, n;
|
|
|
|
vl = unary();
|
|
switch (c = skipws()) {
|
|
|
|
case '*':
|
|
if (getch() != '*') {
|
|
ungetch();
|
|
break;
|
|
}
|
|
|
|
case '^':
|
|
vr = exp();
|
|
n = 1;
|
|
while (vr-- > 0)
|
|
n *= vl;
|
|
return n;
|
|
}
|
|
|
|
ungetch();
|
|
return vl;
|
|
}
|
|
|
|
/*
|
|
* unary : factor | unop unary
|
|
*/
|
|
static int
|
|
unary()
|
|
{
|
|
int val, c;
|
|
|
|
if ((c = skipws()) == '+' || c == '-' || c == '~') {
|
|
val = unary();
|
|
|
|
switch (c) {
|
|
case '+':
|
|
return val;
|
|
case '-':
|
|
return -val;
|
|
case '~':
|
|
return ~val;
|
|
}
|
|
}
|
|
|
|
ungetch();
|
|
return factor();
|
|
}
|
|
|
|
/*
|
|
* factor : constant | '(' query ')'
|
|
*/
|
|
static int
|
|
factor()
|
|
{
|
|
int val;
|
|
|
|
if (skipws() == '(') {
|
|
val = query();
|
|
if (skipws() != ')')
|
|
experr("bad factor");
|
|
return val;
|
|
}
|
|
|
|
ungetch();
|
|
return constant();
|
|
}
|
|
|
|
/*
|
|
* constant: num | 'char'
|
|
* Note: constant() handles multi-byte constants
|
|
*/
|
|
static int
|
|
constant()
|
|
{
|
|
int i;
|
|
int value;
|
|
int c;
|
|
int v[sizeof(int)];
|
|
|
|
if (skipws() != '\'') {
|
|
ungetch();
|
|
return num();
|
|
}
|
|
for (i = 0; i < (int)sizeof(int); i++) {
|
|
if ((c = getch()) == '\'') {
|
|
ungetch();
|
|
break;
|
|
}
|
|
if (c == '\\') {
|
|
switch (c = getch()) {
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7':
|
|
ungetch();
|
|
c = num();
|
|
break;
|
|
case 'n':
|
|
c = 012;
|
|
break;
|
|
case 'r':
|
|
c = 015;
|
|
break;
|
|
case 't':
|
|
c = 011;
|
|
break;
|
|
case 'b':
|
|
c = 010;
|
|
break;
|
|
case 'f':
|
|
c = 014;
|
|
break;
|
|
}
|
|
}
|
|
v[i] = c;
|
|
}
|
|
if (i == 0 || getch() != '\'')
|
|
experr("illegal character constant");
|
|
for (value = 0; --i >= 0;) {
|
|
value <<= 8;
|
|
value += v[i];
|
|
}
|
|
return value;
|
|
}
|
|
|
|
/*
|
|
* num : digit | num digit
|
|
*/
|
|
static int
|
|
num()
|
|
{
|
|
int rval, c, base;
|
|
int ndig;
|
|
|
|
rval = 0;
|
|
ndig = 0;
|
|
c = skipws();
|
|
if (c == '0') {
|
|
c = skipws();
|
|
if (c == 'x' || c == 'X') {
|
|
base = HEX;
|
|
c = skipws();
|
|
} else {
|
|
base = OCTAL;
|
|
ndig++;
|
|
}
|
|
} else
|
|
base = DECIMAL;
|
|
for(;;) {
|
|
switch(c) {
|
|
case '8': case '9':
|
|
if (base == OCTAL)
|
|
goto bad_digit;
|
|
/*FALLTHRU*/
|
|
case '0': case '1': case '2': case '3':
|
|
case '4': case '5': case '6': case '7':
|
|
rval *= base;
|
|
rval += c - '0';
|
|
break;
|
|
case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
|
|
c = tolower(c);
|
|
case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
|
|
if (base == HEX) {
|
|
rval *= base;
|
|
rval += c - 'a' + 10;
|
|
break;
|
|
}
|
|
/*FALLTHRU*/
|
|
default:
|
|
goto bad_digit;
|
|
}
|
|
c = getch();
|
|
ndig++;
|
|
}
|
|
bad_digit:
|
|
ungetch();
|
|
|
|
if (ndig == 0)
|
|
experr("bad constant");
|
|
|
|
return rval;
|
|
}
|
|
|
|
/*
|
|
* eqrel : '=' | '==' | '!=' | '<' | '>' | '<=' | '>='
|
|
*/
|
|
static int
|
|
geteqrel()
|
|
{
|
|
int c1, c2;
|
|
|
|
c1 = skipws();
|
|
c2 = getch();
|
|
|
|
switch (c1) {
|
|
|
|
case '=':
|
|
if (c2 != '=')
|
|
ungetch();
|
|
return EQL;
|
|
|
|
case '!':
|
|
if (c2 == '=')
|
|
return NEQ;
|
|
ungetch();
|
|
ungetch();
|
|
return -1;
|
|
|
|
case '<':
|
|
if (c2 == '=')
|
|
return LEQ;
|
|
ungetch();
|
|
return LSS;
|
|
|
|
case '>':
|
|
if (c2 == '=')
|
|
return GEQ;
|
|
ungetch();
|
|
return GTR;
|
|
|
|
default:
|
|
ungetch();
|
|
ungetch();
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Skip over any white space and return terminating char.
|
|
*/
|
|
static int
|
|
skipws()
|
|
{
|
|
int c;
|
|
|
|
while ((c = getch()) <= ' ' && c > EOS)
|
|
;
|
|
return c;
|
|
}
|
|
|
|
/*
|
|
* resets environment to eval(), prints an error
|
|
* and forces eval to return FALSE.
|
|
*/
|
|
static void
|
|
experr(msg)
|
|
const char *msg;
|
|
{
|
|
printf("m4: %s in expr %s.\n", msg, where);
|
|
longjmp(expjump, -1);
|
|
}
|