added J.T. Conklin's changes to get parens working fine, etc.

This commit is contained in:
cgd 1993-03-23 20:19:35 +00:00
parent 81e9be8dc1
commit a5668e87e6
1 changed files with 315 additions and 95 deletions

View File

@ -2,22 +2,34 @@
/* Written by Pace Willisson (pace@blitz.com)
* and placed in the public domain
*
* $Header: /cvsroot/src/bin/expr/expr.y,v 1.3 1993/03/23 00:25:46 cgd Exp $
* PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
* -------------------- ----- ----------------------
* CURRENT PATCH LEVEL: 1 00092
* -------------------- ----- ----------------------
*
* 15 Mar 93 J.T. Conklin Added support for parens, string
* expressions that are numeric, and
* fixed division by zero.
* Enhanced performance and memory use.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
char *malloc ();
char *calloc ();
enum valtype {
integer, string
} ;
struct val {
char *sval;
int ival;
int iflag;
enum valtype type;
union {
char *s;
int i;
} u;
};
struct val *result;
struct val *op_or ();
struct val *op_and ();
struct val *op_eq ();
@ -79,44 +91,112 @@ expr: TOKEN
%%
struct val *
make_val (sval)
char *sval;
make_integer (i)
int i;
{
struct val *vp;
char *p;
if ((vp = (struct val *)calloc (1, sizeof *vp)) == NULL
|| (vp->sval = malloc (strlen (sval) + 1)) == NULL) {
fprintf (stderr, "out of memory\n");
vp = malloc (sizeof (*vp));
if (vp == NULL) {
fprintf (stderr, "expr: out of memory\n");
exit (2);
}
strcpy (vp->sval, sval);
p = sval;
if (*p == '-')
p++;
while (isdigit (*p))
p++;
if (*p == 0) {
vp->iflag = 1;
vp->ival = atoi (sval);
}
return (vp);
vp->type = integer;
vp->u.i = i;
return vp;
}
struct val *
make_integer (ival)
int ival;
make_str (s)
char *s;
{
char buf[25];
struct val *vp;
sprintf (buf, "%d", ival);
return (make_val (buf));
vp = malloc (sizeof (*vp));
if (vp == NULL || ((vp->u.s = strdup (s)) == NULL)) {
fprintf (stderr, "expr: out of memory\n");
exit (2);
}
vp->type = string;
return vp;
}
void
free_value (vp)
struct val *vp;
{
if (vp->type == string)
free (vp->u.s);
}
int
to_integer (vp)
struct val *vp;
{
char *s;
int neg;
int i;
if (vp->type == integer)
return 1;
s = vp->u.s;
i = 0;
neg = (*s == '-');
if (neg)
s++;
for (;*s; s++) {
if (!isdigit (*s))
return 0;
i *= 10;
i += *s - '0';
}
free (vp->u.s);
if (neg)
i *= -1;
vp->type = integer;
vp->u.i = i;
return 1;
}
void
to_string (vp)
struct val *vp;
{
char *tmp;
if (vp->type == string)
return;
tmp = malloc (25);
if (tmp == NULL) {
fprintf (stderr, "expr: out of memory\n");
exit (2);
}
sprintf (tmp, "%d", vp->u.i);
vp->type = string;
vp->u.s = tmp;
}
int
isstring (vp)
struct val *vp;
{
return (vp->type == string);
}
int
yylex ()
{
@ -129,7 +209,7 @@ yylex ()
p = *av++;
if (strlen (p) == 1) {
if (strchr ("|&=<>+-*/%:", *p))
if (strchr ("|&=<>+-*/%:()", *p))
return (*p);
} else if (strlen (p) == 2 && p[1] == '=') {
switch (*p) {
@ -139,7 +219,7 @@ yylex ()
}
}
yylval.val = make_val (p);
yylval.val = make_str (p);
return (TOKEN);
}
@ -147,11 +227,13 @@ int
is_zero_or_null (vp)
struct val *vp;
{
if (vp->iflag && vp->ival == 0)
return (1);
if (*vp->sval == 0)
return (1);
if (vp->type == integer) {
if (vp->u.i == 0)
return (1);
} else {
if (*vp->u.s == 0)
return (1);
}
return (0);
}
@ -165,10 +247,10 @@ char **argv;
yyparse ();
if (result->iflag)
printf ("%d\n", result->ival);
if (result->type == integer)
printf ("%d\n", result->u.i);
else
printf ("%s\n", result->sval);
printf ("%s\n", result->u.s);
if (is_zero_or_null (result))
exit (1);
@ -180,143 +262,281 @@ int
yyerror (s)
char *s;
{
fprintf (stderr, "syntax error\n");
fprintf (stderr, "expr: syntax error\n");
exit (2);
}
void
check_integers (a, b)
struct val *a, *b;
{
if (!a->iflag || !b->iflag) {
fprintf (stderr, "expr: non-numeric argument\n");
exit (2);
}
}
struct val *
op_or (a, b)
struct val *a, *b;
{
if (is_zero_or_null (a))
if (is_zero_or_null (a)) {
free_value (a);
return (b);
else
} else {
free_value (b);
return (a);
}
}
struct val *
op_and (a, b)
struct val *a, *b;
{
if (is_zero_or_null (a) || is_zero_or_null (b))
if (is_zero_or_null (a) || is_zero_or_null (b)) {
free_value (a);
free_value (b);
return (make_integer (0));
else
} else {
free_value (b);
return (a);
}
}
struct val *
op_eq (a, b)
struct val *a, *b;
{
if (a->iflag && b->iflag)
return (make_integer (a->ival == b->ival));
else
return (make_integer (strcmp (a->sval, b->sval) == 0));
struct val *r;
/* attempt to coerce both arguments to integers */
(void) to_integer (a);
(void) to_integer (b);
/* But if either one of them really is a string, do
a string comparison */
if (isstring (a) || isstring (b)) {
to_string (a);
to_string (b);
r = make_integer (strcmp (a->u.s, b->u.s) == 0);
} else {
r = make_integer (a->u.i == b->u.i);
}
free_value (a);
free_value (b);
return r;
}
struct val *
op_gt (a, b)
struct val *a, *b;
{
if (a->iflag && b->iflag)
return (make_integer (a->ival > b->ival));
else
return (make_integer (strcmp (a->sval, b->sval) > 0));
struct val *r;
/* attempt to coerce both arguments to integers */
(void) to_integer (a);
(void) to_integer (b);
/* But if either one of them really is a string, do
a string comparison */
if (isstring (a) || isstring (b)) {
to_string (a);
to_string (b);
r = make_integer (strcmp (a->u.s, b->u.s) > 0);
} else {
r= make_integer (a->u.i > b->u.i);
}
free_value (a);
free_value (b);
return r;
}
struct val *
op_lt (a, b)
struct val *a, *b;
{
if (a->iflag && b->iflag)
return (make_integer (a->ival < b->ival));
else
return (make_integer (strcmp (a->sval, b->sval) < 0));
struct val *r;
/* attempt to coerce both arguments to integers */
(void) to_integer (a);
(void) to_integer (b);
/* But if either one of them really is a string, do
a string comparison */
if (isstring (a) || isstring (b)) {
to_string (a);
to_string (b);
r = make_integer (strcmp (a->u.s, b->u.s) < 0);
} else {
r = make_integer (a->u.i < b->u.i);
}
free_value (a);
free_value (b);
return r;
}
struct val *
op_ge (a, b)
struct val *a, *b;
{
if (a->iflag && b->iflag)
return (make_integer (a->ival >= b->ival));
else
return (make_integer (strcmp (a->sval, b->sval) >= 0));
struct val *r;
/* attempt to coerce both arguments to integers */
(void) to_integer (a);
(void) to_integer (b);
/* But if either one of them really is a string, do
a string comparison */
if (isstring (a) || isstring (b)) {
to_string (a);
to_string (b);
r = make_integer (strcmp (a->u.s, b->u.s) >= 0);
} else {
r = make_integer (a->u.i >= b->u.i);
}
free_value (a);
free_value (b);
return r;
}
struct val *
op_le (a, b)
struct val *a, *b;
{
if (a->iflag && b->iflag)
return (make_integer (a->ival <= b->ival));
else
return (make_integer (strcmp (a->sval, b->sval) <= 0));
struct val *r;
/* attempt to coerce both arguments to integers */
(void) to_integer (a);
(void) to_integer (b);
/* But if either one of them really is a string, do
a string comparison */
if (isstring (a) || isstring (b)) {
to_string (a);
to_string (b);
r = make_integer (strcmp (a->u.s, b->u.s) <= 0);
} else {
r = make_integer (a->u.i <= b->u.i);
}
free_value (a);
free_value (b);
return r;
}
struct val *
op_ne (a, b)
struct val *a, *b;
{
if (a->iflag && b->iflag)
return (make_integer (a->ival != b->ival));
else
return (make_integer (strcmp (a->sval, b->sval) != 0));
struct val *r;
/* attempt to coerce both arguments to integers */
(void) to_integer (a);
(void) to_integer (b);
/* But if either one of them really is a string, do
a string comparison */
if (isstring (a) || isstring (b)) {
to_string (a);
to_string (b);
r = make_integer (strcmp (a->u.s, b->u.s) != 0);
} else {
r = make_integer (a->u.i != b->u.i);
}
free_value (a);
free_value (b);
return r;
}
struct val *
op_plus (a, b)
struct val *a, *b;
{
check_integers (a, b);
struct val *r;
return (make_integer (a->ival + b->ival));
if (!to_integer (a) || !to_integer (b)) {
fprintf (stderr, "expr: non-numeric argument\n");
exit (2);
}
r = make_integer (a->u.i + b->u.i);
free_value (a);
free_value (b);
return r;
}
struct val *
op_minus (a, b)
struct val *a, *b;
{
check_integers (a, b);
struct val *r;
return (make_integer (a->ival - b->ival));
if (!to_integer (a) || !to_integer (b)) {
fprintf (stderr, "expr: non-numeric argument\n");
exit (2);
}
r = make_integer (a->u.i - b->u.i);
free_value (a);
free_value (b);
return r;
}
struct val *
op_times (a, b)
struct val *a, *b;
{
check_integers (a, b);
struct val *r;
return (make_integer (a->ival * b->ival));
if (!to_integer (a) || !to_integer (b)) {
fprintf (stderr, "expr: non-numeric argument\n");
exit (2);
}
r = make_integer (a->u.i * b->u.i);
free_value (a);
free_value (b);
return (r);
}
struct val *
op_div (a, b)
struct val *a, *b;
{
check_integers (a, b);
struct val *r;
return (make_integer (a->ival / b->ival));
if (!to_integer (a) || !to_integer (b)) {
fprintf (stderr, "expr: non-numeric argument\n");
exit (2);
}
if (b->u.i == 0) {
fprintf (stderr, "expr: division by zero\n");
exit (2);
}
r = make_integer (a->u.i / b->u.i);
free_value (a);
free_value (b);
return r;
}
struct val *
op_rem (a, b)
struct val *a, *b;
{
check_integers (a, b);
struct val *r;
return (make_integer (a->ival % b->ival));
if (!to_integer (a) || !to_integer (b)) {
fprintf (stderr, "expr: non-numeric argument\n");
exit (2);
}
if (b->u.i == 0) {
fprintf (stderr, "expr: division by zero\n");
exit (2);
}
r = make_integer (a->u.i % b->u.i);
free_value (a);
free_value (b);
return r;
}
#include <regexp.h>
@ -330,8 +550,8 @@ struct val *a, *b;
char *p;
char *q;
newexp = malloc (3 * strlen (b->sval));
p = b->sval;
newexp = malloc (3 * strlen (b->u.s));
p = b->u.s;
q = newexp;
*q++ = '^';
@ -356,10 +576,10 @@ struct val *a, *b;
if ((rp = regcomp (newexp)) == NULL)
yyerror ("invalid regular expression");
if (regexec (rp, a->sval)) {
if (regexec (rp, a->u.s)) {
if (rp->startp[1]) {
rp->endp[1][0] = 0;
return (make_val (rp->startp[1]));
return (make_str (rp->startp[1]));
} else {
return (make_integer (rp->endp[0] - rp->startp[0]));
}