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-rw-r--r--Makefile2
-rw-r--r--linetab.c1
-rw-r--r--renumbas.c379
3 files changed, 50 insertions, 332 deletions
diff --git a/Makefile b/Makefile
index a40e13c..41373a2 100644
--- a/Makefile
+++ b/Makefile
@@ -53,7 +53,7 @@ unprotbas: bas.o
protbas: bas.o
-renumbas: bas.o
+renumbas: bas.o bcdfp.o linetab.o
dumpbas: bas.o
diff --git a/linetab.c b/linetab.c
index c4fe392..1889689 100644
--- a/linetab.c
+++ b/linetab.c
@@ -161,5 +161,6 @@ void build_ref_table(void) {
on_exp_token = got_exp;
on_var_token = got_var;
walk_all_code();
+ on_start_stmt = on_cmd_token = on_exp_token = on_var_token = 0;
}
diff --git a/renumbas.c b/renumbas.c
index 272b832..7ee2ca0 100644
--- a/renumbas.c
+++ b/renumbas.c
@@ -6,50 +6,41 @@
#include <time.h>
#include "bas.h"
+#include "bcdfp.h"
+#include "linetab.h"
-/* remove/comment to turn off debug printing */
-#define DEBUG
-
-#ifdef DEBUG
-# define IFDEBUG(x) x
-#else
-# define IFDEBUG(x)
-#endif
-
-int startlineno = 10;
-int increment = 10;
-int limit = 0;
-
-unsigned short *linerefs[32768];
-int linerefcounts[32768];
+unsigned short startlineno = 10;
+unsigned short increment = 10;
+unsigned short limit = 0;
+unsigned short newno;
void print_help(void) {
- fprintf(stderr, "Usage: %s [-v] [-s start-lineno] [-i increment] [-f first-lineno] <inputfile> <outputfile>\n", self);
- fprintf(stderr, " -v: Verbose.\n");
- fprintf(stderr, " -s <num>: Starting line number (default: 10).\n");
- fprintf(stderr, " -i <num>: Increment (default: 10).\n");
- fprintf(stderr, " -f <num>: Don't renumber lines less than <num> (default: 0).\n");
+ fprintf(stderr, "Usage: %s [-v] [-s start-lineno] [-i increment] [-f first-lineno] <inputfile> <outputfile>\n", self);
+ fprintf(stderr, " -v: Verbose.\n");
+ fprintf(stderr, " -s <num>: Starting line number (default: 10).\n");
+ fprintf(stderr, " -i <num>: Increment (default: 10).\n");
+ fprintf(stderr, " -f <num>: Don't renumber lines less than <num> (default: 0).\n");
}
unsigned short getlineno(char opt, const char *arg) {
- int lineno;
- char *e;
+ int lineno;
+ char *e;
- lineno = (int)strtol(arg, &e, 10);
+ lineno = (int)strtol(arg, &e, 10);
- if(*e) {
- fprintf(stderr, "%s: Invalid line number for -%c option: %s is not a number.\n",
- self, opt, arg);
- exit(1);
- }
+ if(*e) {
+ fprintf(stderr, "%s: Invalid line number for -%c option: %s is not a number.\n",
+ self, opt, arg);
+ exit(1);
+ }
- if(lineno < 0 || lineno > 32767) {
- fprintf(stderr, "%s: Invalid line number for -%c option: %d > 32767.\n",
- self, opt, lineno);
- exit(1);
- }
+ if(lineno < 0 || lineno > 32767) {
+ fprintf(stderr, "%s: Invalid line number for -%c option: %d > 32767.\n",
+ self, opt, lineno);
+ exit(1);
+ }
- return ((unsigned short)lineno);
+ return ((unsigned short)lineno);
}
void parse_args(int argc, char **argv) {
@@ -62,8 +53,8 @@ void parse_args(int argc, char **argv) {
case 'i': increment = getlineno(opt, optarg); break;
case 'f': limit = getlineno(opt, optarg); break;
default:
- print_help();
- exit(1);
+ print_help();
+ exit(1);
}
}
@@ -78,312 +69,37 @@ void parse_args(int argc, char **argv) {
output_filename = argv[optind];
}
-unsigned char bcd2int(unsigned char bcd) {
- return (bcd >> 4) * 10 + (bcd & 0x0f);
-}
-
-unsigned char int2bcd(unsigned char i) {
- return ((i / 10) << 4) | (i % 10);
-}
-
-unsigned short fp2int(const unsigned char *fp) {
- unsigned short result = 0;
-
- /* examine the exponent/sign byte */
- if(fp[0] == 0) return 0; /* special case */
- if(fp[0] & 0x80) die("negative numbers not supported");
-
- switch(fp[0]) {
- case 0x40:
- result = bcd2int(fp[1]); break;
- case 0x41:
- result = bcd2int(fp[1]) * 100 + bcd2int(fp[2]); break;
- case 0x42:
- result = bcd2int(fp[1]) * 10000 + bcd2int(fp[2]) * 100 + bcd2int(fp[3]); break;
- default:
- die("number out of range"); break;
- }
-
- return result;
-}
-
-void int2fp(unsigned short num, unsigned char *fp) {
- memset(fp, 0, 6);
-
- if(num == 0) return;
-
- if(num >= 10000) {
- fp[0] = 0x42;
- fp[3] = int2bcd(num % 100);
- num /= 100;
- fp[2] = int2bcd(num % 100);
- num /= 100;
- fp[1] = int2bcd(num);
- } else if(num >= 100) {
- fp[0] = 0x41;
- fp[2] = int2bcd(num % 100);
- num /= 100;
- fp[1] = int2bcd(num);
- } else {
- fp[0] = 0x40;
- fp[1] = int2bcd(num);
- }
-}
-
-void addlineref(unsigned short refaddr) {
- int target = fp2int(program + refaddr);
- unsigned short *p = linerefs[target];
- int c = linerefcounts[target];
-
- IFDEBUG(printf("addlineref: target=%d, 0x%04x\n", target, refaddr));
-
- if(c) {
- p = realloc(p, sizeof(unsigned short) * (c + 1));
- } else {
- p = malloc(sizeof(unsigned short));
- }
-
- if(!p) die("Out of memory.");
-
- linerefs[target] = p;
- p[c] = refaddr;
- c++;
- linerefcounts[target] = c;
-}
-
-void printlinerefs(void) {
- int i, j;
- printf("linerefs:\n");
- for(i = 0; i < 32768; i++) {
- if(linerefcounts[i]) {
- printf("%d: ", i);
- for(j = 0; j < linerefcounts[i]; j++) {
- printf("%04x ", linerefs[i][j]);
- }
- putchar('\n');
- }
- }
-}
-
-void freelinerefs(void) {
+CALLBACK(renumber_line) {
int i;
- for(i = 0; i < 32768; i++) {
- if(linerefcounts[i]) {
- free(linerefs[i]);
- }
- }
-}
-
-/* tokens that can take line numbers:
- Commands:
- GOTO 0x0a
- GO TO 0x0b
- GOSUB 0x0c
- TRAP 0x0d
- LIST 0x04 (but don't bother)
- RESTORE 0x23
-
- Operators:
- GOTO 0x17 (as in, ON (0x1e) GOTO)
- GOSUB 0x18 (ON = 0x1e again)
- THEN 0x1b (but not really!)
-
- beware: e.g. GOTO 1000+A should not have the 1000 changed.
-
- numeric constant introduced with 0x0e, followed by 6 BCD bytes.
- string constant 0x0f, length byte, then (length) bytes.
-*/
-
-int is_xfer_cmd(unsigned char tok) {
- int ret;
- switch(tok) {
- case CMD_GOTO:
- case CMD_GO_TO:
- case CMD_GOSUB:
- case CMD_TRAP:
- case CMD_LIST:
- case CMD_RESTORE:
- ret = 1; break;
- default:
- ret = 0; break;
- }
- IFDEBUG(printf("is_xfer_cmd(%02x) == %d\n", tok, ret));
- return ret;
-}
-
-int skip_op_token(int pos) {
- switch(program[pos]) {
- case OP_EOS:
- return pos + 2; /* skip next-statement offset */
- case OP_EOL:
- return pos + 3; /* skip 2-byte line number */
- case OP_NUMCONST:
- return pos + 7; /* skip 6-byte BCD float */
- case OP_STRCONST:
- return pos + 2 + program[pos + 1]; /* 2nd byte is string len */
- default:
- return pos + 1;
- }
-}
-
-/* ON/GOTO and ON/GOSUB can have any number of arguments, separated
- by OP_COMMA. *Normally* these are simple FP constants, since the
- whole point of ON is to avoid computed line numbers... but they're
- allowed to be expressions so we have to check. */
-int handle_on_goto(int lineno, int pos) {
- unsigned char tok, nexttok, main_tok;
-
- IFDEBUG(printf("handle_on_goto(%02x)\n", pos));
-
- main_tok = program[pos]; /* save this, for use in 'computed' warning */
-
- pos++; /* skip GOTO/GOSUB token */
+ unsigned char fpnewno[6];
- while(1) {
- tok = program[pos];
- if(tok == OP_EOS || tok == OP_EOL)
- break;
- if(tok == OP_COMMA) {
- pos++;
- continue;
- }
- nexttok = program[pos + 7];
- if(tok != OP_NUMCONST || !(nexttok == OP_COMMA || nexttok == OP_EOS || nexttok == OP_EOL)) {
- fprintf(stderr, "Computed line number in ON/%s at line %d.\n",
- (main_tok == OP_GOTO ? "GOTO" : "GOSUB"), lineno);
- break;
- }
- addlineref(pos + 1);
- pos += 7;
+ if(lineno < limit || lineno == 32768) return;
+ if(newno >= 32768) {
+ fprintf(stderr, "New line number %d out of range, renumber failed.", newno);
+ exit(1);
}
- return pos;
-}
+ if(verbose)
+ fprintf(stderr, "renumbering line %d as %d, %d refs\n", lineno, newno, refcounts[lineno]);
-/* IF/THEN can be followed by a simple line number (not a full expression)
- or a statement offset (*without* an OP_EOS token!) followed by a
- statement.
- The right way to do this would be to track the statement offsets, but
- this works fine. It relies on the fact that line numbers always have
- an exponent byte of 0x40 to 0x42, and the fact that 0x40 to 0x42 are
- not valid command tokens.
- */
-int handle_then(int pos) {
- unsigned char tok1 = program[pos + 1];
- unsigned char tok2 = program[pos + 2];
- if(tok1 == OP_NUMCONST && (tok2 >= 0x40 && tok2 <= 0x42)) {
- addlineref(pos + 2);
- return pos + 7;
- } else {
- return 0;
- }
+ int2fp(newno, fpnewno);
+ for(i = 0; i < refcounts[lineno]; i++)
+ memmove(program + linerefs[lineno][i].pos, fpnewno, 6);
+ setword(pos, newno);
+ newno += increment;
}
void renumber(void) {
- int pos = codestart, nextpos;
- int lineno, offset;
- int newno, i;
- unsigned char tok;
- unsigned char fpnewno[6];
-
- /* pass 1: find references to line numbers, flag them. */
- while(pos < filelen) {
- lineno = getword(pos);
- if(lineno == 32768) break;
- offset = program[pos + 2];
- IFDEBUG(printf("checking line %d, pos %04x...\n", lineno, pos));
- if(offset < 6)
- die("Can't renumber a code-protected program, unprotect it first.");
- nextpos = pos + offset;
-
- pos += 4; /* skip line number, line length, 1st statement length */
-
- /* loop over the statements in this line */
- while(pos < nextpos) {
- /* every statement starts with a command token */
- tok = program[pos];
-
- if(tok == CMD_REM || tok == CMD_DATA || tok == CMD_ERROR)
- break; /* ignore rest of line */
-
- if(is_xfer_cmd(tok)) {
- unsigned char nexttok = program[pos + 8];
- if(program[pos + 1] == OP_NUMCONST && (nexttok == OP_EOS || nexttok == OP_EOL)) {
- addlineref(pos + 2);
- } else {
- fprintf(stderr, "Computed line number at line %d.\n", lineno);
- }
- }
-
- pos++;
-
- /* rest of statement is expressions/operators */
- while(pos < nextpos) {
- tok = program[pos];
-
- if(tok == OP_EOL) break;
-
- if(tok == OP_EOS) {
- pos += 2; /* end statement, skip statement length of next one */
- break;
- }
-
- if(tok == OP_GOTO || tok == OP_GOSUB) {
- pos = handle_on_goto(lineno, pos);
- continue;
- } else if(tok == OP_THEN) {
- i = handle_then(pos);
- if(i) {
- pos = i;
- continue;
- } else {
- pos += 2; /* skip statement length */
- break;
- }
- }
-
- IFDEBUG(printf("tok is %02x, pos was %02x before skip_op_token... ", tok, pos));
- pos = skip_op_token(pos);
- IFDEBUG(printf("pos now %02x\n", pos));
- }
- }
+ int i;
- pos = nextpos; /* point to next line */
+ for(i = 0; i < 32768; i++) {
+ if(refcounts[i] && !lines_exist[i])
+ fprintf(stderr, "Warning: Line %d is referenced, but does not exist.\n", i);
}
- IFDEBUG(printlinerefs());
-
- /* pass 2: renumber the lines, and update the references in other lines */
newno = startlineno;
- pos = codestart;
- while(pos < filelen) {
- if(newno >= 32768) {
- fprintf(stderr, "New line number %d out of range, renumber failed.", newno);
- exit(1);
- }
-
- lineno = getword(pos);
- offset = program[pos + 2];
-
- if(lineno >= limit) {
- if(lineno == 32768) break;
-
- IFDEBUG(printf("renumbering line %d as %d, %d refs\n", lineno, newno, linerefcounts[lineno]));
-
- /* update refs to old line number with new one */
- int2fp(newno, fpnewno);
- for(i = 0; i < linerefcounts[lineno]; i++)
- memmove(program + linerefs[lineno][i], fpnewno, 6);
-
- /* update the actual line number */
- setword(pos, newno);
-
- newno += increment;
- }
- pos += offset;
- }
-
- freelinerefs();
+ on_start_line = renumber_line;
+ walk_all_code();
}
int main(int argc, char **argv) {
@@ -394,10 +110,11 @@ int main(int argc, char **argv) {
readfile();
parse_header();
+ build_ref_table();
renumber();
open_output(output_filename);
- writefile();
+ writefile();
return 0;
}