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// vim: set noexpandtab sw=8 :
/*
* PDP-8 format converter.
*
* Usage: p8bin2hex tape.bin > tape.hex
*
* Assumes tape.bin is a SIMH-compatible paper tape image in "BIN" or "RIM"
* formats.
*
* RIM format:
* 10.000.000 leader/trailer (at least an inch of these)
* 01.aaa.aaa address hi (bits 5:0 contain address 11:6)
* 00.aaa.aaa address lo (bits 5:0 contain address 5:0)
* 00.xxx.xxx data hi (bits 5:0 contain data 11:6)
* 00.xxx.xxx data lo (bits 5:0 contain data 5:0)
* <repeat any number of [address, data] pairs>
*
* FIXME: RIM format currently almost always fails with bad checksum
*
* BIN format:
* 10.000.000 leader/trailer (at least an inch of these)
* 11.011.000 "field" (bits 6:4 specify address 14:12)
* 01.000.010 origin hi bits: bits 5:0 contain origin 11:6
* 00.011.100 origin lo bits: bits 5:0 contain origin 5:0
* 00.xxx.xxx data hi bits: bits 5:0 contain data word 11:6
* 00.xxx.xxx data lo bits: bits 5:0 contain data word 5:0
* <repeat any number of [origin, data+] sequences>
* 00.xxx.xxx chucksum hi - sum of all data and origin frames, but
* 00.xxx.xxx chucksum lo - excluding field and leader/trailer
*
* Some tapes may contain assembler error messages. These are are text
* delimited by 0377 bytes. The BIN loader ignores bytes from starting
* at any 0377 byte, until another 0377 byte is seen.
*/
#include <assert.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
uint16_t mem[32768];
int
load(FILE *fp)
{
bool binfile = false;
bool sawdata = false;
enum { Addr, Data, Leader, Fetch, Skip , Start } s = Start;
int c = 0, n, v = 0;
uint16_t a = 0, d = 0, t = 0, u = 0;
for (n = 0; (c = getc(fp)) != EOF; ++n) {
switch (s) {
case Addr:
u += c;
a |= c;
s = Fetch;
break;
case Data:
u += c;
d |= 0x8000 | c;
s = Fetch;
break;
case Fetch:
fetch:
if (c == 0200) {
if ((d & 0x8000) != 0) {
if (binfile && (d & 07777) != (t & 07777))
fprintf(stderr, "\nbad checksum %05o\n", t & 07777);
else
v = 1;
}
goto leadout;
}
t += u;
u = 0;
if (d & 0x8000) {
mem[a] = d & 07777;
binfile |= sawdata;
sawdata = true;
a = (a & ~07777) | ((a + 1) & 07777);
d = 0;
}
if ((c & 0300) == 0000) {
u = c;
d = (c & 077) << 6;
s = Data;
break;
}
if ((c & 0300) == 0100) {
u = c;
a = (a & ~07777) | (c & 077) << 6;
sawdata = false;
s = Addr;
break;
}
if ((c & 0307) == 0300) {
a = ((c & 0070) << 9) | (a & 07777);
break;
}
if (c == 0377) {
s = Skip;
break;
}
break;
case Leader:
leader:
if (c != 0200) {
s= Fetch;
goto fetch;
}
break;
case Skip:
if (c == 0377)
s = Fetch;
break;
case Start:
if (c == 0200) {
s = Leader;
goto leader;
}
break;
}
}
leadout:
while ((c = getc(fp)) != EOF)
;
return v;
}
#define MAX_LINE_SIZE 1023
char buf[MAX_LINE_SIZE * 2] = {0};
void
print(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
int size = vsnprintf(NULL, 0, fmt, args) + 1;
va_end(args);
char tmp[size];
va_start(args, fmt);
vsnprintf(tmp, size, fmt, args);
va_end(args);
strncat(buf, tmp, MAX_LINE_SIZE * 2 - 1);
if (strlen(buf) > MAX_LINE_SIZE) {
char *space = strrchr(buf, ' ');
assert(space);
assert(space - buf <= MAX_LINE_SIZE);
*space = 0;
++space;
assert(strlen(buf) <= MAX_LINE_SIZE);
printf("%s\n", buf);
memmove(buf, space, buf + sizeof(buf) - space);
}
}
void
flush()
{
if (buf[0])
printf("%s\n", buf);
buf[0] = 0;
}
void
dump(unsigned int wordsperline)
{
unsigned int nextaddr = 0;
for (uint_fast32_t a = 0; a < 32768; a += wordsperline) {
uint16_t words[wordsperline];
bool allzero = true;
for (uint_fast32_t i = 0; i < wordsperline; ++i) {
words[i] = mem[a+i];
allzero &= words[i] == 0;
}
if (allzero) continue;
if (nextaddr != a) {
if (nextaddr + wordsperline == a)
print("= ");
else
print("!%x ", (unsigned int)((a - nextaddr) / wordsperline));
}
print("=");
for (uint_fast32_t i = 0; i < wordsperline; ++i) {
if (i != 0)
print(":");
print("%04x", (unsigned int)words[i]);
}
print(" ");
nextaddr = a + wordsperline;
}
if (nextaddr != 32768)
print("!%x\n", (unsigned int)((32768 - nextaddr) / wordsperline));
flush();
}
int
main(int argc, char *argv[])
{
if (argc < 3) {
fprintf(stderr, "usage: p8 wordsperline filename.bin|rim [... filename.bin|rim]\n");
exit(EXIT_FAILURE);
}
char *end;
unsigned int wordsperline = strtol(argv[1], &end, 0);
if (*end) {
perror(argv[1]);
exit(EXIT_FAILURE);
}
for (int i = 2; i < argc; ++i) {
fprintf(stderr, "Loading %s...\n", argv[i]);
FILE *fp = fopen(argv[i], "rb");
if (!fp) {
perror(argv[i]);
exit(EXIT_FAILURE);
}
if (!load(fp))
exit(EXIT_FAILURE);
fclose(fp);
}
dump(wordsperline);
exit(EXIT_SUCCESS);
}
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