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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include "bas.h"
#include "bcdfp.h"
unsigned short *linerefs[32769];
int refcounts[32769];
int lines_exist[32769];
unsigned char last_cmd, on_op;
int last_cmd_pos;
void add_lineref(unsigned short from, unsigned short to) {
unsigned short *p;
int c;
if(to > 32767) return;
p = linerefs[to];
c = refcounts[to];
if(c) {
p = realloc(p, sizeof(unsigned short) * (c + 1));
} else {
p = malloc(sizeof(unsigned short));
}
if(!p) die("Out of memory.");
linerefs[to] = p;
p[c] = from;
c++;
refcounts[to] = c;
}
/* makes sure a numeric constant isn't start of an expression. */
int is_standalone_num(unsigned short pos) {
if(program[pos] != OP_NUMCONST) return 0;
switch(program[pos + 7]) {
case OP_EOS:
case OP_EOL:
case OP_COMMA:
return 1;
default:
return 0;
}
}
CALLBACK(start_stmt) {
lines_exist[lineno] = 1;
}
CALLBACK(got_cmd) {
last_cmd = tok;
last_cmd_pos = pos;
on_op = 0;
}
void computed_msg(unsigned short lineno) {
static int last_lineno = -1;
char *cmd;
/* avoid duplicate warnings */
if(lineno == last_lineno) return;
last_lineno = lineno;
switch(last_cmd) {
case CMD_GOTO:
cmd = "GOTO"; break;
case CMD_GO_TO:
cmd = "GO TO"; break;
case CMD_GOSUB:
cmd = "GOSUB"; break;
case CMD_RESTORE:
cmd = "RESTORE"; break;
case CMD_TRAP:
cmd = "TRAP"; break;
case CMD_ON:
if(on_op == OP_GOSUB)
cmd = "ON/GOSUB";
else
cmd = "ON/GOTO";
break;
default: /* should never happen! */
cmd = "???"; break;
}
fprintf(stderr, "Computed %s at line %d\n", cmd, lineno);
}
CALLBACK(got_var) {
switch(last_cmd) {
case CMD_GOTO:
case CMD_GO_TO:
case CMD_GOSUB:
case CMD_RESTORE:
case CMD_TRAP:
computed_msg(lineno);
break;
default:
break;
}
}
CALLBACK(got_exp) {
int standalone;
if(last_cmd == CMD_ON) {
if(tok == OP_GOTO || tok == OP_GOSUB)
on_op = tok;
}
if(tok != OP_NUMCONST) return;
standalone = is_standalone_num(pos);
switch(last_cmd) {
case CMD_GOTO:
case CMD_GO_TO:
case CMD_GOSUB:
case CMD_RESTORE:
case CMD_TRAP:
if((pos == last_cmd_pos + 1) && standalone) {
add_lineref(lineno, fp2int(program + pos + 1));
} else {
computed_msg(lineno);
}
break;
case CMD_ON: {
unsigned char last_tok = program[pos - 1];
switch(last_tok) {
case OP_GOTO:
case OP_GOSUB:
case OP_COMMA:
if(standalone)
add_lineref(lineno, fp2int(program + pos + 1));
else
computed_msg(lineno);
break;
default:
break;
}
}
break;
default:
break;
}
}
void build_ref_table(void) {
on_start_stmt = start_stmt;
on_cmd_token = got_cmd;
on_exp_token = got_exp;
on_var_token = got_var;
walk_all_code();
}
void print_ref_table(void) {
int i, j;
for(i = 0; i < 32768; i++) {
if(refcounts[i]) {
if(!lines_exist[i]) putchar('!');
printf("%d: ", i);
for(j = 0; j < refcounts[i]; j++) {
printf("%d ", linerefs[i][j]);
}
putchar('\n');
}
}
}
void print_help(void) {
fprintf(stderr, "Usage: %s [-v] program.bas\n", self);
exit(0);
}
void parse_args(int argc, char **argv) {
int opt;
while( (opt = getopt(argc, argv, "v")) != -1) {
switch(opt) {
case 'v': verbose = 1; break;
default: print_help(); exit(1);
}
}
if(optind >= argc)
die("No input file given (use - for stdin).");
else
open_input(argv[optind]);
}
int main(int argc, char **argv) {
set_self(*argv);
parse_general_args(argc, argv, print_help);
parse_args(argc, argv);
readfile();
parse_header();
build_ref_table();
print_ref_table();
return 0;
}
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