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/* Copyright (C) 2019 C. McEnroe <june@causal.agency>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 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 the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
%{
#include <ctype.h>
#include <err.h>
#include <histedit.h>
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <sysexits.h>
int yylex(void);
void yyerror(const char *str);
#define YYSTYPE uint64_t
enum { RingLen = 64 };
static struct {
uint64_t vals[RingLen];
size_t len;
} ring;
static void push(uint64_t val) {
ring.vals[ring.len++ % RingLen] = val;
}
static uint64_t get(size_t i) {
return ring.vals[i % RingLen];
}
%}
%token Int Shl Shr Sar
%left '|'
%left '^'
%left '&'
%left Shl Shr Sar
%left '+' '-'
%left '*' '/' '%'
%right '~'
%left 'K' 'M' 'G' 'T'
%%
input:
expr { push($1); }
| input ',' expr { push($3); }
|
;
expr:
Int
| '_' { $$ = get(ring.len - 1); }
| '[' Int ']' { $$ = get($2); }
| '(' expr ')' { $$ = $2; }
| expr 'K' { $$ = $1 << 10; }
| expr 'M' { $$ = $1 << 20; }
| expr 'G' { $$ = $1 << 30; }
| expr 'T' { $$ = $1 << 40; }
| '~' expr { $$ = ~$2; }
| '-' expr { $$ = -$2; }
| expr '*' expr { $$ = $1 * $3; }
| expr '/' expr { $$ = $1 / $3; }
| expr '%' expr { $$ = $1 % $3; }
| expr '+' expr { $$ = $1 + $3; }
| expr '-' expr { $$ = $1 - $3; }
| expr Shl expr { $$ = $1 << $3; }
| expr Shr expr { $$ = $1 >> $3; }
| expr Sar expr { $$ = (int64_t)$1 >> $3; }
| expr '&' expr { $$ = $1 & $3; }
| expr '^' expr { $$ = $1 ^ $3; }
| expr '|' expr { $$ = $1 | $3; }
;
%%
#include "bitlex.c"
int yywrap(void) {
return 1;
}
void yyerror(const char *str) {
if (yychar < 128 && isprint(yychar)) {
warnx("%s at '%c'", str, yychar);
} else {
warnx("%s at %d", str, yychar);
}
}
static char *prompt(EditLine *el) {
(void)el;
static char buf[64];
snprintf(buf, sizeof(buf), "[%zu]: ", ring.len);
return buf;
}
static void print(size_t i) {
uint64_t val = get(i);
int bits = val > UINT32_MAX ? 64
: val > UINT16_MAX ? 32
: val > UINT8_MAX ? 16
: 8;
char bin[65] = {0};
for (int i = 0; i < 64; ++i) {
bin[i] = '0' + (val >> (63 - i) & 1);
}
printf(
"[%zu]: %"PRId64" 0x%0*"PRIX64" 0b%s",
i, (int64_t)val, bits >> 2, val, &bin[64 - bits]
);
if (val) {
if (!(val & (1ULL << 40) - 1)) {
printf(" %"PRId64"T", val >> 40);
} else if (!(val & (1 << 30) - 1)) {
printf(" %"PRId64"G", val >> 30);
} else if (!(val & (1 << 20) - 1)) {
printf(" %"PRId64"M", val >> 20);
} else if (!(val & (1 << 10) - 1)) {
printf(" %"PRId64"K", val >> 10);
}
}
if (val < 128 && isprint(val)) {
printf(" '%c'", (char)val);
}
printf("\n");
}
int main(void) {
HistEvent ev;
History *hist = history_init();
if (!hist) err(EX_OSERR, "history_init");
history(hist, &ev, H_SETSIZE, 64);
history(hist, &ev, H_SETUNIQUE, 1);
EditLine *el = el_init("bit", stdin, stdout, stderr);
if (!el) err(EX_IOERR, "el_init");
el_set(el, EL_PROMPT, prompt);
el_set(el, EL_HIST, history, hist);
for (;;) {
int len;
const char *line = el_gets(el, &len);
if (!len) break;
HistEvent ev;
history(hist, &ev, H_ENTER, line);
size_t i = ring.len;
YY_BUFFER_STATE state = yy_scan_string(line);
int error = yyparse();
yy_delete_buffer(state);
if (error) continue;
for (; i < ring.len; ++i) {
print(i);
}
printf("\n");
}
el_end(el);
history_end(hist);
}
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