595 lines
9.4 KiB
Plaintext
595 lines
9.4 KiB
Plaintext
%{
|
|
/* Written by Pace Willisson (pace@blitz.com)
|
|
* and placed in the public domain
|
|
*
|
|
* PATCHES MAGIC LEVEL PATCH THAT GOT US HERE
|
|
* -------------------- ----- ----------------------
|
|
* CURRENT PATCH LEVEL: 1 00148
|
|
* -------------------- ----- ----------------------
|
|
*
|
|
* 20 Apr 93 J. T. Conklin Many fixes for () and other such things
|
|
*/
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <ctype.h>
|
|
|
|
enum valtype {
|
|
integer, string
|
|
} ;
|
|
|
|
struct val {
|
|
enum valtype type;
|
|
union {
|
|
char *s;
|
|
int i;
|
|
} u;
|
|
};
|
|
|
|
struct val *result;
|
|
struct val *op_or ();
|
|
struct val *op_and ();
|
|
struct val *op_eq ();
|
|
struct val *op_gt ();
|
|
struct val *op_lt ();
|
|
struct val *op_ge ();
|
|
struct val *op_le ();
|
|
struct val *op_ne ();
|
|
struct val *op_plus ();
|
|
struct val *op_minus ();
|
|
struct val *op_times ();
|
|
struct val *op_div ();
|
|
struct val *op_rem ();
|
|
struct val *op_colon ();
|
|
|
|
char **av;
|
|
%}
|
|
|
|
%union
|
|
{
|
|
struct val *val;
|
|
}
|
|
|
|
%left <val> '|'
|
|
%left <val> '&'
|
|
%left <val> '=' '>' '<' GE LE NE
|
|
%left <val> '+' '-'
|
|
%left <val> '*' '/' '%'
|
|
%left <val> ':'
|
|
%left UNARY
|
|
|
|
%token <val> TOKEN
|
|
%type <val> start expr
|
|
|
|
%%
|
|
|
|
start: expr { result = $$; }
|
|
|
|
expr: TOKEN
|
|
| '(' expr ')' { $$ = $2; }
|
|
| expr '|' expr { $$ = op_or ($1, $3); }
|
|
| expr '&' expr { $$ = op_and ($1, $3); }
|
|
| expr '=' expr { $$ = op_eq ($1, $3); }
|
|
| expr '>' expr { $$ = op_gt ($1, $3); }
|
|
| expr '<' expr { $$ = op_lt ($1, $3); }
|
|
| expr GE expr { $$ = op_ge ($1, $3); }
|
|
| expr LE expr { $$ = op_le ($1, $3); }
|
|
| expr NE expr { $$ = op_ne ($1, $3); }
|
|
| expr '+' expr { $$ = op_plus ($1, $3); }
|
|
| expr '-' expr { $$ = op_minus ($1, $3); }
|
|
| expr '*' expr { $$ = op_times ($1, $3); }
|
|
| expr '/' expr { $$ = op_div ($1, $3); }
|
|
| expr '%' expr { $$ = op_rem ($1, $3); }
|
|
| expr ':' expr { $$ = op_colon ($1, $3); }
|
|
| '-' expr %prec UNARY { $$ = op_minus (NULL, $2); }
|
|
;
|
|
|
|
|
|
%%
|
|
|
|
struct val *
|
|
make_integer (i)
|
|
int i;
|
|
{
|
|
struct val *vp;
|
|
|
|
vp = (struct val *) malloc (sizeof (*vp));
|
|
if (vp == NULL) {
|
|
fprintf (stderr, "expr: out of memory\n");
|
|
exit (2);
|
|
}
|
|
|
|
vp->type = integer;
|
|
vp->u.i = i;
|
|
return vp;
|
|
}
|
|
|
|
struct val *
|
|
make_str (s)
|
|
char *s;
|
|
{
|
|
struct val *vp;
|
|
|
|
vp = (struct val *) 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 ()
|
|
{
|
|
struct val *vp;
|
|
char *p;
|
|
|
|
if (*av == NULL)
|
|
return (0);
|
|
|
|
p = *av++;
|
|
|
|
if (strlen (p) == 1) {
|
|
if (strchr ("|&=<>+-*/%:()", *p))
|
|
return (*p);
|
|
} else if (strlen (p) == 2 && p[1] == '=') {
|
|
switch (*p) {
|
|
case '>': return (GE);
|
|
case '<': return (LE);
|
|
case '!': return (NE);
|
|
}
|
|
}
|
|
|
|
yylval.val = make_str (p);
|
|
return (TOKEN);
|
|
}
|
|
|
|
int
|
|
is_zero_or_null (vp)
|
|
struct val *vp;
|
|
{
|
|
/* Like most other versions of expr, this version will return
|
|
false for a string value of multiple zeros.*/
|
|
|
|
if (vp->type == integer) {
|
|
return (vp->u.i == 0);
|
|
} else {
|
|
return (*vp->u.s == 0 || strcmp (vp->u.s, "0") == 0);
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
void
|
|
main (argc, argv)
|
|
int argc;
|
|
char **argv;
|
|
{
|
|
av = argv + 1;
|
|
|
|
yyparse ();
|
|
|
|
if (result->type == integer)
|
|
printf ("%d\n", result->u.i);
|
|
else
|
|
printf ("%s\n", result->u.s);
|
|
|
|
if (is_zero_or_null (result))
|
|
exit (1);
|
|
else
|
|
exit (0);
|
|
}
|
|
|
|
int
|
|
yyerror (s)
|
|
char *s;
|
|
{
|
|
fprintf (stderr, "expr: syntax error\n");
|
|
exit (2);
|
|
}
|
|
|
|
|
|
struct val *
|
|
op_or (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
if (is_zero_or_null (a)) {
|
|
free_value (a);
|
|
return (b);
|
|
} 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)) {
|
|
free_value (a);
|
|
free_value (b);
|
|
return (make_integer (0));
|
|
} else {
|
|
free_value (b);
|
|
return (a);
|
|
}
|
|
}
|
|
|
|
struct val *
|
|
op_eq (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
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;
|
|
{
|
|
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;
|
|
{
|
|
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;
|
|
{
|
|
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;
|
|
{
|
|
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;
|
|
{
|
|
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;
|
|
{
|
|
struct val *r;
|
|
|
|
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;
|
|
{
|
|
struct val *r;
|
|
|
|
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;
|
|
{
|
|
struct val *r;
|
|
|
|
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;
|
|
{
|
|
struct val *r;
|
|
|
|
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;
|
|
{
|
|
struct val *r;
|
|
|
|
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>
|
|
|
|
struct val *
|
|
op_colon (a, b)
|
|
struct val *a, *b;
|
|
{
|
|
regexp *rp;
|
|
char *newexp;
|
|
char *p;
|
|
char *q;
|
|
|
|
newexp = malloc (3 * strlen (b->u.s));
|
|
p = b->u.s;
|
|
q = newexp;
|
|
|
|
*q++ = '^';
|
|
while (*p) {
|
|
if (*p == '\\') {
|
|
p++;
|
|
if (*p == '(' || *p == ')') {
|
|
*q++ = *p++;
|
|
} else {
|
|
*q++ = '\\';
|
|
*q++ = *p++;
|
|
}
|
|
} else if (*p == '(' || *p == ')') {
|
|
*q++ = '\\';
|
|
*q++ = *p++;
|
|
} else {
|
|
*q++ = *p++;
|
|
}
|
|
}
|
|
*q = 0;
|
|
|
|
if ((rp = regcomp (newexp)) == NULL)
|
|
yyerror ("invalid regular expression");
|
|
|
|
if (regexec (rp, a->u.s)) {
|
|
if (rp->startp[1]) {
|
|
rp->endp[1][0] = 0;
|
|
return (make_str (rp->startp[1]));
|
|
} else {
|
|
return (make_integer (rp->endp[0] - rp->startp[0]));
|
|
}
|
|
} else {
|
|
return (make_integer (0));
|
|
}
|
|
}
|
|
|
|
void
|
|
regerror (s)
|
|
const char *s;
|
|
{
|
|
fprintf (stderr, "expr: %s\n", s);
|
|
exit (2);
|
|
}
|