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-rw-r--r--coreutils/expr.c141
1 files changed, 69 insertions, 72 deletions
diff --git a/coreutils/expr.c b/coreutils/expr.c
index ecba825d5..f58f4b062 100644
--- a/coreutils/expr.c
+++ b/coreutils/expr.c
@@ -7,6 +7,7 @@
*
* Busybox modifications
* Copyright (c) 2000 Edward Betts <edward@debian.org>.
+ * Aug 2003 Vladimir Oleynik - reduced 464 bytes.
*
* this program is free software; you can redistribute it and/or modify
* it under the terms of the gnu general public license as published by
@@ -40,6 +41,7 @@
#include <stdlib.h>
#include <regex.h>
#include <sys/types.h>
+#include <errno.h>
#include "busybox.h"
@@ -135,10 +137,8 @@ static int null (VALUE *v)
switch (v->type) {
case integer:
return v->u.i == 0;
- case string:
+ default: /* string: */
return v->u.s[0] == '\0' || strcmp (v->u.s, "0") == 0;
- default:
- abort ();
}
}
@@ -156,13 +156,9 @@ static void tostring (VALUE *v)
static int toarith (VALUE *v)
{
+ if(v->type == string) {
int i;
- switch (v->type) {
- case integer:
- return 1;
- case string:
- i = 0;
/* Don't interpret the empty string as an integer. */
if (v->u.s == 0)
return 0;
@@ -170,10 +166,8 @@ static int toarith (VALUE *v)
free (v->u.s);
v->u.i = i;
v->type = integer;
- return 1;
- default:
- abort ();
}
+ return 1;
}
/* Return nonzero if the next token matches STR exactly.
@@ -189,56 +183,59 @@ nextarg (char *str)
/* The comparison operator handling functions. */
-#define cmpf(name, rel) \
-static int name (VALUE *l, VALUE *r) \
-{ \
- if (l->type == string || r->type == string) { \
- tostring (l); \
- tostring (r); \
- return strcmp (l->u.s, r->u.s) rel 0; \
- } \
- else \
- return l->u.i rel r->u.i; \
-}
- cmpf (less_than, <)
- cmpf (less_equal, <=)
- cmpf (equal, ==)
- cmpf (not_equal, !=)
- cmpf (greater_equal, >=)
- cmpf (greater_than, >)
+static int cmp_common (VALUE *l, VALUE *r, int op)
+{
+ int cmpval;
-#undef cmpf
+ if (l->type == string || r->type == string) {
+ tostring (l);
+ tostring (r);
+ cmpval = strcmp (l->u.s, r->u.s);
+ }
+ else
+ cmpval = l->u.i - r->u.i;
+ switch(op) {
+ case '<':
+ return cmpval < 0;
+ case ('L'+'E'):
+ return cmpval <= 0;
+ case '=':
+ return cmpval == 0;
+ case '!':
+ return cmpval != 0;
+ case '>':
+ return cmpval > 0;
+ default: /* >= */
+ return cmpval >= 0;
+ }
+}
/* The arithmetic operator handling functions. */
-#define arithf(name, op) \
-static \
-int name (VALUE *l, VALUE *r) \
-{ \
- if (!toarith (l) || !toarith (r)) \
- bb_error_msg_and_die ("non-numeric argument"); \
- return l->u.i op r->u.i; \
-}
-
-#define arithdivf(name, op) \
-static int name (VALUE *l, VALUE *r) \
-{ \
- if (!toarith (l) || !toarith (r)) \
- bb_error_msg_and_die ( "non-numeric argument"); \
- if (r->u.i == 0) \
- bb_error_msg_and_die ( "division by zero"); \
- return l->u.i op r->u.i; \
+static int arithmetic_common (VALUE *l, VALUE *r, int op)
+{
+ int li, ri;
+
+ if (!toarith (l) || !toarith (r))
+ bb_error_msg_and_die ("non-numeric argument");
+ li = l->u.i;
+ ri = r->u.i;
+ if((op == '/' || op == '%') && ri == 0)
+ bb_error_msg_and_die ( "division by zero");
+ switch(op) {
+ case '+':
+ return li + ri;
+ case '-':
+ return li - ri;
+ case '*':
+ return li * ri;
+ case '/':
+ return li / ri;
+ default:
+ return li % ri;
+ }
}
- arithf (plus, +)
- arithf (minus, -)
- arithf (multiply, *)
- arithdivf (divide, /)
- arithdivf (mod, %)
-
-#undef arithf
-#undef arithdivf
-
/* Do the : operator.
SV is the VALUE for the lhs (the string),
PV is the VALUE for the rhs (the pattern). */
@@ -408,21 +405,21 @@ static VALUE *eval5 (void)
static VALUE *eval4 (void)
{
VALUE *l, *r;
- int (*fxn) (VALUE *, VALUE *), val;
+ int op, val;
l = eval5 ();
while (1) {
if (nextarg ("*"))
- fxn = multiply;
+ op = '*';
else if (nextarg ("/"))
- fxn = divide;
+ op = '/';
else if (nextarg ("%"))
- fxn = mod;
+ op = '%';
else
return l;
args++;
r = eval5 ();
- val = (*fxn) (l, r);
+ val = arithmetic_common (l, r, op);
freev (l);
freev (r);
l = int_value (val);
@@ -434,19 +431,19 @@ static VALUE *eval4 (void)
static VALUE *eval3 (void)
{
VALUE *l, *r;
- int (*fxn) (VALUE *, VALUE *), val;
+ int op, val;
l = eval4 ();
while (1) {
if (nextarg ("+"))
- fxn = plus;
+ op = '+';
else if (nextarg ("-"))
- fxn = minus;
+ op = '+';
else
return l;
args++;
r = eval4 ();
- val = (*fxn) (l, r);
+ val = arithmetic_common (l, r, op);
freev (l);
freev (r);
l = int_value (val);
@@ -458,29 +455,29 @@ static VALUE *eval3 (void)
static VALUE *eval2 (void)
{
VALUE *l, *r;
- int (*fxn) (VALUE *, VALUE *), val;
+ int op, val;
l = eval3 ();
while (1) {
if (nextarg ("<"))
- fxn = less_than;
+ op = '<';
else if (nextarg ("<="))
- fxn = less_equal;
+ op = 'L'+'E';
else if (nextarg ("=") || nextarg ("=="))
- fxn = equal;
+ op = '=';
else if (nextarg ("!="))
- fxn = not_equal;
+ op = '!';
else if (nextarg (">="))
- fxn = greater_equal;
+ op = 'G'+'E';
else if (nextarg (">"))
- fxn = greater_than;
+ op = '>';
else
return l;
args++;
r = eval3 ();
toarith (l);
toarith (r);
- val = (*fxn) (l, r);
+ val = cmp_common (l, r, op);
freev (l);
freev (r);
l = int_value (val);