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eparse.y
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eparse.y
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/*
* configk: an easy way to edit kernel configuration files and templates
* Copyright (C) 2023-2024 Red Hat Inc.
*
* 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
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* See COPYING file or <http://www.gnu.org/licenses/> for more details.
*/
%locations
%define lr.type ielr
%define api.pure full
%define api.prefix {ee}
%define parse.error verbose
%parse-param {unsigned char cmd}
%parse-param {char **val}
%initial-action { ifctx = 0; }
%union {
int num;
char *txt;
};
%token <txt> EE_CONFID EE_VALUE EE_RANGE
%token <txt> EE_IF EE_OR EE_AND
%token <txt> EE_NE EE_LT EE_LE EE_GT EE_GE
%token <txt> EE_BM EE_EM EE_MARG
%token <txt> EE_TAB EE_EOL
%start expression
%type <num> expr expression
%type <txt> macroexpr rangexpr
%left '=' EE_NE EE_LT EE_LE EE_GT EE_GE
%left EE_OR EE_AND
%right EE_IF
%precedence NEG
%{
#include <stdio.h>
#include "configk.h"
static int8_t is_enabled(const char *);
static cEntry *get_centry(const char *);
int8_t eval_expression(uint8_t, const char *, char **);
void yyerror(YYLTYPE *, uint8_t, char **, char const *);
uint8_t ifctx = 0;
extern char *gstr;
extern char *types[];
extern int yylex(YYSTYPE *, YYLTYPE *);
%}
%%
expression:
%empty { $$ = 0; }
| expression expr { return $$ ? $$ && $2 : $2; }
| expression expr ';' {
if ($2 > 0 && (cmd == EXPR_DEFAULT || cmd == EXPR_RANGE))
return $2;
$$ = $$ ? $$ && $2 : $2;
}
;
expr:
EE_CONFID {
$$ = eval_expression(ifctx ? ifctx : cmd, $1, val);
if (opts & OUT_VERBOSE)
fprintf(stderr, "%s(%d) ", $1, $$);
$$ = ($$ <= 0) ? 0 : $$;
free($1);
}
| EE_CONFID EE_IF { ifctx = 1; } expr {
ifctx = 0;
$$ = $4;
if ($$)
$$ = eval_expression(cmd, $1, val);
if (opts & OUT_VERBOSE)
fprintf(stderr, "%s(%d) ", $1, $$);
$$ = ($$ <= 0) ? 0 : $$;
free($1);
}
| EE_VALUE {
$$ = 0;
if (val) {
free(*val);
*val = strdup($1);
if (opts & OUT_VERBOSE)
fprintf(stderr, "v(%s) ", $1);
$$ = 1;
}
free($1);
}
| EE_VALUE EE_IF { ifctx = 1; } expr {
ifctx = 0;
$$ = $4;
if ($$ && val) {
free(*val);
*val = strdup($1);
if (opts & OUT_VERBOSE)
fprintf(stderr, "v(%s) ", $1);
$$ = 1;
}
free($1);
}
| EE_CONFID '=' EE_CONFID {
int8_t e1 = eval_expression(1, $1, val);
int8_t e3 = eval_expression(1, $3, val);
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%d) = %s(%d)) ", $1, e1, $3, e3);
e1 = (e1 <= 0) ? 0 : e1;
e3 = (e3 <= 0) ? 0 : e3;
$$ = (e1 == e3);
free($1); free($3);
}
| EE_CONFID '=' EE_VALUE {
$$ = 0;
cEntry *t1 = get_centry($1);
if (t1) {
char *v1 = t1->opt_value;
$$ = !strcmp(v1, $3);
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%s) = v(%s)) ", $1, v1, $3);
}
free($1); free($3);
}
| EE_CONFID EE_NE EE_CONFID {
int8_t e1 = eval_expression(1, $1, val);
int8_t e3 = eval_expression(1, $3, val);
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%d) != %s(%d)) ", $1, e1, $3, e3);
e1 = (e1 <= 0) ? 0 : e1;
e3 = (e3 <= 0) ? 0 : e3;
$$ = (e1 != e3);
free($1); free($3);
}
| EE_CONFID EE_NE EE_VALUE {
$$ = 0;
cEntry *t = get_centry($1);
if (t) {
$$ = strcmp(t->opt_value, $3);
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%s) != v(%s)) ", $1, t->opt_value, $3);
}
free($1); free($3);
}
| EE_CONFID EE_GE EE_CONFID {
$$ = 0;
cEntry *t1 = get_centry($1);
cEntry *t3 = get_centry($3);
if (t1 && t3) {
char *v1 = t1->opt_value;
char *v3 = t3->opt_value;
$$ = strcmp(v1, v3) >= 0 ? 1 : 0;
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%s) >= %s(%s)) ", $1, v1, $3, v3);
}
free($1); free($3);
}
| EE_CONFID EE_GE EE_VALUE {
$$ = 0;
cEntry *t1 = get_centry($1);
if (t1) {
char *v1 = t1->opt_value;
$$ = strcmp(v1, $3) >= 0 ? 1 : 0;
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%s) >= v(%s)) ", $1, v1, $3);
}
free($1); free($3);
}
| EE_CONFID EE_LE EE_CONFID { $$ = 0;
$$ = 0;
cEntry *t1 = get_centry($1);
cEntry *t3 = get_centry($3);
if (t1 && t3) {
char *v1 = t1->opt_value;
char *v3 = t3->opt_value;
$$ = strcmp(v1, v3) <= 0 ? 1 : 0;
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%s) <= %s(%s)) ", $1, v1, $3, v3);
}
free($1); free($3);
}
| EE_CONFID EE_LE EE_VALUE {
$$ = 0;
cEntry *t1 = get_centry($1);
if (t1) {
char *v1 = t1->opt_value;
$$ = strcmp(v1, $3) <= 0 ? 1 : 0;
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%s) <= v(%s)) ", $1, v1, $3);
}
free($1); free($3);
}
| EE_CONFID EE_GT EE_CONFID {
$$ = 0;
cEntry *t1 = get_centry($1);
cEntry *t3 = get_centry($3);
if (t1 && t3) {
char *v1 = t1->opt_value;
char *v3 = t3->opt_value;
$$ = strcmp(v1, v3) > 0 ? 1 : 0;
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%s) > %s(%s)) ", $1, v1, $3, v3);
}
free($1); free($3);
}
| EE_CONFID EE_GT EE_VALUE {
$$ = 0;
cEntry *t1 = get_centry($1);
if (t1) {
char *v1 = t1->opt_value;
$$ = strcmp(v1, $3) > 0 ? 1 : 0;
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%s) > v(%s)) ", $1, v1, $3);
}
free($1); free($3);
}
| EE_CONFID EE_LT EE_CONFID {
$$ = 0;
cEntry *t1 = get_centry($1);
cEntry *t3 = get_centry($3);
if (t1 && t3) {
char *v1 = t1->opt_value;
char *v3 = t3->opt_value;
$$ = strcmp(v1, v3) < 0 ? 1 : 0;
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%s) < %s(%s)) ", $1, v1, $3, v3);
}
free($1); free($3);
}
| EE_CONFID EE_LT EE_VALUE {
$$ = 0;
cEntry *t1 = get_centry($1);
if (t1) {
char *v1 = t1->opt_value;
$$ = strcmp(v1, $3) < 0 ? 1 : 0;
if (opts & OUT_VERBOSE)
fprintf(stderr, "(%s(%s) < v(%s)) ", $1, v1, $3);
}
free($1); free($3);
}
| '!' expr %prec NEG { $$ = !$2; }
| expr EE_OR expr { $$ = ($1 || $3); }
| expr EE_AND expr { $$ = ($1 && $3); }
| EE_BM expr EE_EM { $$ = $2; }
| EE_BM macroexpr EE_EM {
$$=0;
if (opts & OUT_VERBOSE)
fprintf(stderr, "$(%s)\n", $2);
free($2);
}
| EE_BM macroexpr EE_EM EE_IF { ifctx=1; } expr {
$$=0;
if (opts & OUT_VERBOSE)
fprintf(stderr, "$(%s) if %d\n", $2, $6);
free($2);
}
| EE_RANGE rangexpr {
$$ = 0;
if (val) {
snprintf(*val, 64, "%s", $2);
$$ = 1;
}
free($2);
}
| EE_RANGE rangexpr EE_IF { ifctx = 1; } expr {
ifctx = 0;
$$ = $5;
if ($$ && val)
snprintf(*val, 64, "%s", $2);
else if (!$$)
snprintf(*val, 64, "0 0");
free($2);
}
;
macroexpr:
EE_MARG { $$ = $1; }
| EE_MARG ',' EE_MARG {
int len = strlen($1) + strlen($3) + 3;
char *s = calloc(len, sizeof(uint8_t));
snprintf(s, len, "%s,%s", $1, $3);
$$ = s;
free($1); free($3);
}
| EE_MARG ',' EE_MARG ',' EE_MARG {
int len = strlen($1) + strlen($3) + strlen($5) + 4;
char *s = calloc(len, sizeof(uint8_t));
snprintf(s, len, "%s,%s,%s", $1, $3, $5);
$$ = s;
free($1); free($3); free($5);
}
| EE_MARG ',' EE_MARG ',' EE_MARG ',' EE_MARG {
int len = strlen($1) + strlen($3) + strlen($5) + strlen($7) + 5;
char *s = calloc(len, sizeof(uint8_t));
snprintf(s, len, "%s,%s,%s,%s", $1, $3, $5, $7);
$$ = s;
free($1); free($3); free($5); free($7);
}
;
rangexpr:
EE_VALUE EE_VALUE {
int len = strlen($1) + strlen($2) + 2;
char *s = calloc(len, sizeof(uint8_t));
snprintf(s, len, "%s %s", $1, $2);
$$ = s;
free($1); free($2);
}
| EE_VALUE EE_CONFID {
char *s = NULL;
int len = strlen($1) + 2;
cEntry *t1 = get_centry($2);
if (t1 && t1->opt_status) {
len += strlen(t1->opt_value);
s = calloc(len, sizeof(uint8_t));
snprintf(s, len, "%s %s", $1, t1->opt_value);
}
else {
s = calloc(len, sizeof(uint8_t));
snprintf(s, len, "%s 0", $1);
}
$$ = s;
free($1); free($2);
}
| EE_CONFID EE_CONFID {
char *s = NULL;
cEntry *t1 = get_centry($1);
cEntry *t2 = get_centry($2);
if (t1 && t1->opt_status && t2 && t2->opt_status) {
int len = strlen(t1->opt_value) + strlen(t2->opt_value) + 2;
s = calloc(len, sizeof(uint8_t));
snprintf(s, len, "%s %s", t1->opt_value, t2->opt_value);
}
else {
uint8_t len = 5;
s = calloc(len, sizeof(uint8_t));
snprintf(s, len, "0 0");
}
$$ = s;
free($1); free($2);
}
;
%%
void
yyerror(YYLTYPE *loc, uint8_t etype, char **val, char const *serr)
{
warnx("%s => %d:%d: %s:%s", __func__, loc->last_line, etype, *val, serr);
}
static cEntry *
get_centry(const char *sopt)
{
cNode *c = hsearch_kconfigs(sopt);
if (!c)
return NULL;
return (cEntry *)c->data;
}
static int8_t
is_enabled(const char *sopt)
{
cEntry *t = get_centry(sopt);
if (!t)
//warnx("%s: option %s not found", __func__, sopt);
return -1;
if (!t->opt_status)
return t->opt_status;
if (t->opt_value && (CBOOL == t->opt_type || CTRISTATE == t->opt_type))
{
if ('n' == *t->opt_value || 'N' == *t->opt_value)
return 0;
else if ('m' == *t->opt_value || 'M' == *t->opt_value)
return 1;
else
return 2;
}
return t->opt_status;
}
int8_t
get_default_value(const char *sopt, char **val)
{
cNode *c = hsearch_kconfigs(sopt);
if (!c)
return 0;
cEntry *t = (cEntry *)c->data;
if (t->opt_status && val)
{
free(*val);
*val = strdup(t->opt_value);
}
return t->opt_status;
}
int8_t
eval_expression(uint8_t cmd, const char *opt, char **val)
{
int8_t r = 0;
switch (cmd)
{
case EXPR_DEFAULT:
r = get_default_value(opt, val);
break;
case ENABLE_CONFIG:
case TOGGLE_CONFIG:
case DISABLE_CONFIG:
r = toggle_configs(opt, cmd, *val, true);
break;
default:
r = is_enabled(opt);
}
return r;
}