#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <netinet/in.h>
#include <sys/stat.h>
#include <sys/time.h>
#include "ultrahost.h"
#include "PR/bbfs.h"
#include "PR/R4300.h"
#include "PR/bcp.h"

#ifdef USE_READLINE
#include <readline/readline.h>
#include <readline/history.h>
#endif

#include "mon.h"

/*
 * send commands to remote monitor and receive responses
 * basic flow is:
 *     send 2-word request <command, length of data>
 *     send data
 *     receive 2-word response <response is 255-cmd, length of data>
 *     receive data if any
 */

static int fd = 255;

static unsigned char block[BB_FL_BLOCK_SIZE];
static unsigned char blist[BB_FL_BLOCK_SIZE];
static BbFat16 fat[2];	/* maximum 128MB flash */
static int blocks;

#define SK_BLOCKS	4
#define SL_BLOCKS	1
#define SA_BLOCKS	(BB_FL_BYTE_TO_BLOCK(BB_SYSTEM_AREA_SIZE)-2*SL_BLOCKS-SK_BLOCKS)
#define SYS_BLOCKS	(SK_BLOCKS + 2*SL_BLOCKS + SA_BLOCKS)

#define SK_OFF	0			/* first sk block */
#define SL0_OFF	SK_BLOCKS		/* sys license0 block */
#define SL1_OFF (SL0_OFF+SL_BLOCKS)	/* sys license1 block */
#define SA0_OFF (SL1_OFF+SL_BLOCKS)	/* first sys app0 block */

/*XXXblythe round up transfers to a multiple of 4 for irix */
#define RND(x)		(((x)+3)&~3)

static int sblocks[SYS_BLOCKS];

static const char*
basename(const char* s) {
    char* p;
    if ((p = strrchr(s, '/')) && p[1]) return p+1;
    return s;; 
}

void
sum(const unsigned char* p, int n) {
    int i;
    unsigned short s = 0;
    for(i = 0; i < n; i++)
	s += p[i];
    printf("sum %04x\n", s);
}

static int
send_cmd(const void* buf, int len) {
    int rv, i;

    for(i = 0; i < len/4; i++)
	*((unsigned int*)buf+i) = htonl(*((unsigned int*)buf+i));
    if ((rv = uhWriteGame(fd, (void*)buf, len)) == -1) {
        perror("uhWriteGame");
	exit(1);
    }
    return rv;
}

static int
read_rsp(void* buf, int len) {
    int rv, i;
    if ((rv = uhReadGame(fd, buf, len)) == -1) {
        perror("uhReadGame");
	exit(1);
    }
    for(i = 0; i < len/4; i++)
	*((unsigned int*)buf+i) = ntohl(*((unsigned int*)buf+i));
    return rv;
}

static int
send_data(const void* buf, int len) {
    int rv;
    if ((rv = uhWriteGame(fd, (void*)buf, len)) == -1) {
        perror("uhWriteGame");
	exit(1);
    }
    return rv;
}

static int
read_data(void* buf, int len) {
    int rv;
    if ((rv = uhReadGame(fd, buf, len)) == -1) {
        perror("uhReadGame");
	exit(1);
    }
    return rv;
}

static int
jump(unsigned int addr) {
    unsigned int hbuf[2];
    hbuf[0] = REQ_JUMP;
    hbuf[1] = addr;
    send_cmd(hbuf, 8);
    read_rsp(hbuf, 8);
    if (hbuf[0] != 255-REQ_JUMP || hbuf[1] != 0) {
	fprintf(stderr, "jump failed\n");
	return 1;
    }
    return 0;
}

static int blist_good;

static int
read_blist(int first_only) {
    unsigned int hbuf[2];
    int rv;
    if (blist_good && first_only) return 0;
    blist_good = 1;
    printf("scanning blocks\n");

    hbuf[0] = REQ_SCAN_BLOCKS;
    hbuf[1] = 0;
    send_cmd(hbuf, 8);
    read_rsp(hbuf, 8);
    if (hbuf[0] != 255-REQ_SCAN_BLOCKS || (hbuf[1]&0x80000000)) {
	fprintf(stderr, "scan blocks failed %d\n", hbuf[1]);
	return -1;
    }
    rv = read_data(blist, blocks = hbuf[1]);
    if (rv > 0) {
	/* compute addresses for sk, sal, and sa */
	int i, j;
	for(j = i = 0; i < blocks; i++) {
	    if (blist[i] == 0) {
		sblocks[j++] = i;
		if (j >= SYS_BLOCKS) break;
	    }
	}
	printf("found %d sys blocks\n", j);
    }
    return rv;
}

static int
write_block(const void* block, const void*spare,  int off) {
    unsigned int hbuf[2], r;
    /* write a block on the BBCard */
    hbuf[0] = spare ? REQ_WRITE_BLOCK_SP : REQ_WRITE_BLOCK;
    r = 255-hbuf[0];
    hbuf[1] = off;
    send_cmd(hbuf, 8);
    send_data(block, BB_FL_BLOCK_SIZE);
    if (spare) send_data(spare, BB_FL_SPARE_SIZE);
    read_rsp(hbuf, 8);
    if (hbuf[0] != r || hbuf[1] != 0) {
	fprintf(stderr, "write block %d failed\n", off);
	return -1;
    }
    return 0;
}

static int
read_block(void* block, void* spare, int off) {
    unsigned int hbuf[2], r;
    /* write a block on the BBCard */
    hbuf[0] = spare ? REQ_READ_BLOCK_SP : REQ_READ_BLOCK;
    r = 255-hbuf[0];
    hbuf[1] = off;
    send_cmd(hbuf, 8);
    read_rsp(hbuf, 8);
    read_data(block, BB_FL_BLOCK_SIZE);
    if (spare) read_data(spare, BB_FL_SPARE_SIZE);
    if (hbuf[0] != r || hbuf[1] != 0) {
	fprintf(stderr, "read block %d failed\n", off);
	return -1;
    }
    return 0;
}

static int
read_blocks(const char* file, int start, int n) {
    FILE* fp;
    int i;
    if ((fp = fopen(file, "w")) == NULL) {
	perror(file);
	return -1;
    }
    for(i = 0; i < n; i++) {
	memset(block, 0, sizeof block);
	if (read_block(block, 0, sblocks[start+i]) < 0) {
	    fclose(fp);
	    return -1;
	}
	fwrite(block, sizeof block, 1, fp);
    }
    fclose(fp);
    return 0;
}

static int
write_blocks(const char* file, int start, int n, int link_start) {
    FILE* fp;
    int link = link_start;
    u8 spare[BB_FL_SPARE_SIZE];
    if ((fp = fopen(file, "r")) == NULL) {
	perror(file);
	return -1;
    }
    memset(block, 0, sizeof block);
    memset(spare, 0xff, sizeof spare);
    while(fread(block, 1, sizeof block, fp) > 0) {
	if (--n < 0) {
	    printf("%s too large, truncating :)\n", file);
	    break;
	}
	if (link)  {
	    int prev = sblocks[link_start++];
            if(prev>255) return -1;
	    spare[BB_FL_BLOCK_LINK_OFF] = prev;
	    spare[BB_FL_BLOCK_LINK_OFF+1] = prev;
	    spare[BB_FL_BLOCK_LINK_OFF+2] = prev;
	    if (link_start >= SYS_BLOCKS) link_start = 0;
	}
	if (write_block(block, link ? spare : 0, sblocks[start++]) < 0) {
	    fclose(fp);
	    return -1;
	}
	memset(block, 0, sizeof block);
    }
    fclose(fp);
    return 0;
}


static int
delete_file(const char* file, int report) {
    unsigned int hbuf[2];
    hbuf[0] = REQ_DELETE_FILE;
    hbuf[1] = strlen(file)+1;
    send_cmd(hbuf, 8);
    send_data(file, RND(strlen(file)+1));
    read_rsp(hbuf, 8);
    if (hbuf[0] != 255-REQ_DELETE_FILE || (report && hbuf[1] != 0)) {
	fprintf(stderr, "delete %s failed\n", file);
    }
    return 0;
}

static int
move_file(const char* old, const char* new) {
    unsigned int hbuf[2];
    hbuf[0] = REQ_RENAME_FILE;
    hbuf[1] = strlen(old)+1;
    send_cmd(hbuf, 8);
    send_data(old, RND(strlen(old)+1));
    hbuf[0] = htonl(strlen(new)+1);
    send_data(hbuf, 4);
    send_data(new, RND(strlen(new)+1));
    read_rsp(hbuf, 8);
    if (hbuf[0] != 255-REQ_RENAME_FILE || hbuf[1] != 0) {
	fprintf(stderr, "move %s %s failed %d\n", new, old, hbuf[1]);
    }
    return 0;
}

static int
write_file(const char* in, const char* out) {
    FILE* fp;
    unsigned char* b;
    unsigned int hbuf[2];
    struct stat sb;
    unsigned int x, n, i;
    struct timeval tv1, tv2;
    float t;
    if ((fp = fopen(in, "r")) == NULL) {
	perror(in);
	return -1;
    }
    fstat(fileno(fp), &sb);
    n = RND(sb.st_size);
    b = malloc(n);
    fread(b, sb.st_size, 1, fp);
    fclose(fp);
    gettimeofday(&tv1, NULL);
    hbuf[0] = REQ_WRITE_FILE;
    hbuf[1] = sb.st_size;
    send_cmd(hbuf, 8);
    x = htonl(strlen(out)+1);
    send_data(&x, 4);
    send_data(out, RND(ntohl(x)));
    /* read first response */
    read_rsp(hbuf, 8);
    if (hbuf[0] != 255-REQ_WRITE_FILE || hbuf[1] != 0) {
	fprintf(stderr, "file write of %s failed\n", in);
	free(b);
	return -1;
    }
    for(i = 0; i < n; i += BB_FL_BLOCK_SIZE)
	send_data(b+i, n-i < BB_FL_BLOCK_SIZE ? n-i : BB_FL_BLOCK_SIZE);
    free(b);
    /* read second response */
    read_rsp(hbuf, 8);
    if (hbuf[0] != 255-REQ_WRITE_FILE || hbuf[1] != 0) {
	fprintf(stderr, "file write of %s failed\n", in);
	return -1;
    }
    gettimeofday(&tv2, NULL);
    t = (float)(tv2.tv_sec-tv1.tv_sec) + (tv2.tv_usec-tv1.tv_usec)/1000000.f;
    printf("%.1f KB %.1f sec %.1f KB/s\n", sb.st_size/1024.f, t, sb.st_size/1000.f/t);
    return 0;
}

static int
read_file(const char* in, const char* out) {
    FILE* fp;
    unsigned char* b;
    unsigned int hbuf[2];
    int len, n;
    if ((fp = fopen(out, "w")) == NULL) {
	perror(out);
	return -1;
    }
    hbuf[0] = REQ_READ_FILE;
    hbuf[1] = strlen(in)+1;
    send_cmd(hbuf, 8);
    send_data(in, RND(strlen(in)+1));
    read_rsp(hbuf, 8);
    if (hbuf[0] != 255-REQ_READ_FILE || (hbuf[1]&0x80000000)) {
	fprintf(stderr, "file read of %s failed\n", in);
	fclose(fp);
	return -1;
    }
    b = malloc(n = RND(hbuf[1]));
    for(len = 0; len < n; len += BB_FL_BLOCK_SIZE) {
	read_data(b+len, n-len < BB_FL_BLOCK_SIZE ? n-len : BB_FL_BLOCK_SIZE);
    }
    fwrite(b, hbuf[1], 1, fp);
    fclose(fp);
    free(b);
    return 0;
}

static int
mkfat(unsigned char* blist, BbFat16* fat) {
    int i, k, l;
    u16 csum = 0, *p = (u16*)fat, link = 0;

    for(k = 0; k < blocks/BB_FAT16_ENTRIES; k++) {
	memcpy(fat[k].magic, k ? BB_FAT16_LINK_MAGIC : BB_FAT16_MAGIC, sizeof fat[k].magic);
	fat[k].seq = 1;
    }

    for(i = 0; i < blocks; i++)
	BB_FAT16_NEXT(fat,i) = blist[i] ? BB_FAT_BAD : BB_FAT_AVAIL;
    for(i = 0; i < BB_FAT16_BLOCKS; i++) {
	if (BB_FAT16_NEXT(fat,blocks-1-i) != BB_FAT_BAD)
	    BB_FAT16_NEXT(fat,blocks-1-i) = BB_FAT_RESERVED;
    }
    for(i = 0; i < BB_SYSTEM_AREA_SIZE/BB_FL_BLOCK_SIZE; i++) {
	if (BB_FAT16_NEXT(fat,i) != BB_FAT_BAD)
	    BB_FAT16_NEXT(fat,i) = BB_FAT_RESERVED;
    }

    /* fix endianness */
    for(i = 0; i < blocks; i++)
	BB_FAT16_NEXT(fat,i) = htons(BB_FAT16_NEXT(fat,i));
    for(i = 0; i < BB_INODE16_ENTRIES; i++) {
	fat->inode[i].block = htons(fat->inode[i].block);
	fat->inode[i].size = htonl(fat->inode[i].size);
    }
    l = blocks-1;
    for(k = blocks/BB_FAT16_ENTRIES; --k >= 0;) {
	fat[k].seq = htonl(fat[k].seq);
	fat[k].link = htons(link);
	/* update version stamp, checksum */
	for(csum = i = 0; i < BB_FL_BLOCK_SIZE/sizeof(u16)-1; i++)
	    csum += ntohs(p[k*BB_FL_BLOCK_SIZE/sizeof(u16)+i]);
	fat[k].cksum = htons(BB_FAT16_CKSUM - csum);
	while(blist[l]) l--;
	link = l;
    }
    return 0;
}

int
main(int argc, char **argv) {
    char *p, file[256], file2[256], args[256];
#ifdef USE_READLINE
    char *line=NULL, *expansion = NULL; 
    int result;
    char history_file[256];
#else
    char line[256]; 
#endif
    unsigned int hbuf[2];
    int n, i, rv;
    FILE* fp;

#if 1
#ifdef __sgi
    if ((fd = uhOpenGame("/dev/u64_data")) == -1) {
#else
    if ((fd = uhOpenGame("/tmp/u64_data")) == -1) {
#endif
	perror("uhOpenGame");
    	exit(1);
    }
#endif

#ifdef USE_READLINE
    if (getenv("HOME")) {
        strcpy(history_file, getenv("HOME"));
    } else {
        history_file[0] = '.';
        history_file[1] = 0;
    }
    strcat(history_file, "/.bb_history");
    read_history(history_file);
#endif

    for(;;) {
next:
#ifdef USE_READLINE
        if (line) free(line);
        if ((line = readline("> ")) == NULL) break;
        expansion = NULL;
        result = history_expand(line, &expansion);
        if (expansion) {
            free(line);
            line = expansion;
        }
        if (result < 0 || result == 2) {
            printf("%s\n", line);
            continue;
        }
#else
	printf("> "); fflush(stdout);
	if (!fgets(line, sizeof line, stdin)) break;
#endif
	if ((p = strrchr(line, '\n'))) *p = '\0';
	for(p = line; *p && isspace(*p); ++p) ;
#ifdef USE_READLINE
        if (*p) add_history(p);
#endif
	memset(hbuf, 0, sizeof hbuf);
	memset(file, 0, sizeof file);
	memset(file2, 0, sizeof file2);
	if (*p == 'h' || *p == '?') { /* help */
	    printf("\th             - help\n"
		   "\ta file [name] - add file [name] to BBCard\n"
		   "\tc file [name] - copy file from BBCard to host\n"
		   "\td file        - delete file from BBCard\n"
		   "\tf             - reload file system\n"
		   "\tg file        - execute unencrypted kernel from host\n"
		   "\tl             - list BBCard files\n"
		   "\tm old new     - rename old to new\n"
		   "\tx file [args] - load and execute rom file from BBCard\n"
		   "\tr file [args] - copy file to BBCard and execute\n"
		   "\ty file        - load and execute rom file from host\n"
		   "\tk file        - update secure kernel on BBCard\n"
		   "\tK file        - upload secure kernel to host\n"
		   "\ts file        - update system app on BBCard\n"
		   "\tS file        - upload system app to host\n"
		   "\tt file        - update system app license on BBCard\n"
		   "\tT file        - upload system app license to host\n"
		   "\tX file [host] - checksum file and host file\n"
		   "\tp             - ping BB\n"
		   "\to             - power off\n"
		   "\tb             - list bad blocks\n"
		   "\tz             - reformat/make file system\n"
		   "\ti             - run diag\n"
		   "\tq             - quit\n");
	} else if (*p == 'q') { /* quit */
	    break;
	} else if (*p == 'p') { /* ping */
	    hbuf[0] = REQ_PING;
	    send_cmd(hbuf, 8);
            read_rsp(hbuf, 8);
	    if (hbuf[0] != 255-REQ_PING || hbuf[1] != 0) {
		fprintf(stderr, "sync loss\n");
		return 1;
	    }
	} else if (*p == 'o') { /* off */
	    hbuf[0] = REQ_POWER_OFF;
	    send_cmd(hbuf, 8);
	    read_rsp(hbuf, 8);
	    if (hbuf[0] != 255-REQ_POWER_OFF || hbuf[1] != 0) {
		fprintf(stderr, "power off failed\n");
		return 1;
	    }
	} else if (*p == 'a') { /* add file */
	    if ((rv = sscanf(p+1, "%s %s", file, file2)) < 1) {
		fprintf(stderr, "usage: a file [name]\n");
		goto next;
	    }
	    write_file(file, rv == 1 ? basename(file) : file2);
	} else if (*p == 'c') { /* copy file */
	    if ((rv = sscanf(p+1, "%s %s", file, file2)) < 1) {
		fprintf(stderr, "usage: c file [name]\n");
		goto next;
	    }
	    read_file(file, rv == 1 ? file : file2);
	} else if (*p == 'd') { /* delete file */
	    if (sscanf(p+1, "%s", file) != 1) {
		fprintf(stderr, "usage: d file\n");
		goto next;
	    }
	    delete_file(file, 1);
	} else if (*p == 'm') { /* move file */
	    if ((rv = sscanf(p+1, "%s %s", file, file2)) < 2) {
		fprintf(stderr, "usage: m old new\n");
		goto next;
	    }
	    move_file(file, file2);
	} else if (*p == 'f') { /* reload filesystem */
	    hbuf[0] = REQ_FS_INIT;
	    send_cmd(hbuf, 8);
	    read_rsp(hbuf, 8);
	    if (hbuf[0] != 255-REQ_FS_INIT || hbuf[1] & 0x80000000)
		fprintf(stderr, "fs reload failed %d\n", hbuf[1]);
	    blist_good = 0;
	} else if (*p == 'l') { /* list directory */
	    hbuf[0] = REQ_READ_DIR;
	    send_cmd(hbuf, 8);
	    read_rsp(hbuf, 8);
printf("read dir %d\n", hbuf[1]);
	    if (hbuf[0] != 255-REQ_READ_DIR || hbuf[1] & 0x80000000) {
		fprintf(stderr, "read directory failed %d\n", hbuf[1]);
	    } else {
		int size;
		for(i = 0; i < hbuf[1]; i++) {
		    read_data(file, 16);
		    read_data(&size, 4); size = ntohl(size);
		    printf("%.12s %d\n", file, size);
		}
	    }
	} else if (*p == 'r') { /* copy file to BBCard and execute */
	    if ((rv = sscanf(p+1, "%s%n", file, &n)) != 1) {
		fprintf(stderr, "usage: r file [args]\n");
		goto next;
	    }
	    if (access(file, R_OK) < 0) {
		perror(file);
		goto next;
	    }
	    delete_file(basename(file), 0);
	    if (write_file(file, basename(file)) < 0) goto next;
	    strcpy(file, basename(file));
	    goto exec;
	} else if (*p == 'x') { /* execute BBCard file */
	    if (sscanf(p+1, "%s%n", file, &n) != 1) {
		fprintf(stderr, "usage: x file\n");
		goto next;
	    }
exec:
	    memset(args, 0, sizeof args);
	    while(isspace(p[1+n])) n++;
	    for(i = 0; p[n+1] != '\0';)
		args[i++] = p[1+n++];
	    if (!i) i = 1; /* can't xfer 0 bytes */
	    hbuf[0] = REQ_EXEC_FILE;
	    hbuf[1] = strlen(file)+1;
	    send_cmd(hbuf, 8);
	    send_data(file, RND(strlen(file)+1));
	    hbuf[0] = htonl(RND(i));
	    send_data(hbuf, 4);
	    send_data(args, RND(i));
	    read_rsp(hbuf, 8);
	    if (hbuf[0] != 255-REQ_EXEC_FILE || hbuf[1] != 0) {
		fprintf(stderr, "exec %s failed\n", file);
	    }
	} else if (*p == 'y') { /* execute host file */
	    unsigned char* b;
	    unsigned int addr;
	    struct stat sb;
	    if (sscanf(p+1, "%s", file) != 1) {
		fprintf(stderr, "usage: y file\n");
		goto next;
	    }
	    if ((fp = fopen(file, "r")) == NULL) {
		perror(file);
		goto next;
	    }
	    fstat(fileno(fp), &sb);
	    if (sb.st_size > 1024*1024+4096)
		sb.st_size = 1024*1024+4096;
	    b = malloc(RND(sb.st_size));
	    fread(b, sb.st_size, 1, fp);
	    fclose(fp);
	    hbuf[0] = REQ_WRITE_MEM;
	    hbuf[1] = sb.st_size-4096;
	    send_cmd(hbuf, 8);
	    send_data(b+8, 4);
	    addr = ntohl(*(unsigned int*)(b+8));
	    send_data(b+4096, RND(sb.st_size-4096));
	    sum(b+4096, sb.st_size-4096);
	    free(b);
	    read_rsp(hbuf, 8);
	    if (hbuf[0] != 255-REQ_WRITE_MEM || hbuf[1] != 0) {
		fprintf(stderr, "mem write of %s failed\n", file);
		goto next;
	    }
	    jump(addr);
	} else if (*p == 'g') { /* execute host kernel */
	    unsigned char* b;
	    unsigned int addr;
	    struct stat sb;
	    if (sscanf(p+1, "%s", file) != 1) {
		fprintf(stderr, "usage: y file\n");
		goto next;
	    }
	    if ((fp = fopen(file, "r")) == NULL) {
		perror(file);
		goto next;
	    }
	    fstat(fileno(fp), &sb);
	    if (sb.st_size > 1024*64)
		sb.st_size = 1024*64;
	    b = malloc(RND(sb.st_size));
	    fread(b, sb.st_size, 1, fp);
	    fclose(fp);
	    hbuf[0] = REQ_WRITE_MEM;
	    hbuf[1] = sb.st_size;
	    send_cmd(hbuf, 8);
	    addr = PHYS_TO_K1(BOOT_RAM_LO_START);
	    hbuf[0] = htonl(addr);
	    send_data(hbuf, 4);
	    send_data(b, RND(sb.st_size));
	    sum(b, sb.st_size);
	    free(b);
	    read_rsp(hbuf, 8);
	    if (hbuf[0] != 255-REQ_WRITE_MEM || hbuf[1] != 0) {
		fprintf(stderr, "mem write of %s failed\n", file);
		goto next;
	    }
	    jump(addr);
	} else if (*p == 'k') { /* update kernel */
	    if (sscanf(p+1, "%s", file) != 1) {
		fprintf(stderr, "usage: k file\n");
		goto next;
	    }
	    read_blist(1);
	    write_blocks(file, SK_OFF, SK_BLOCKS, 0);
	} else if (*p == 'K') { /* copy kernel */
	    if (sscanf(p+1, "%s", file) != 1) {
		fprintf(stderr, "usage: K file\n");
		goto next;
	    }
	    read_blist(1);
	    read_blocks(file, SK_OFF, SK_BLOCKS);
	} else if (*p == 's') { /* update sys app */
	    if (sscanf(p+1, "%s", file) != 1) {
		fprintf(stderr, "usage: s file\n");
		goto next;
	    }
	    read_blist(1);
	    write_blocks(file, SA0_OFF, SA_BLOCKS, SA0_OFF+1);
	} else if (*p == 'S') { /* copy sys app */
	    if (sscanf(p+1, "%s", file) != 1) {
		fprintf(stderr, "usage: S file\n");
		goto next;
	    }
	    read_blist(1);
	    read_blocks(file, SA0_OFF, SA_BLOCKS);
	} else if (*p == 't') { /* update license */
	    if (sscanf(p+1, "%s", file) != 1) {
		fprintf(stderr, "usage: t file\n");
		goto next;
	    }
	    read_blist(1);
	    write_blocks(file, SL0_OFF, SL_BLOCKS, SA0_OFF);
	} else if (*p == 'T') { /* copy license */
	    if (sscanf(p+1, "%s", file) != 1) {
		fprintf(stderr, "usage: T file\n");
		goto next;
	    }
	    read_blist(1);
	    read_blocks(file, SL0_OFF, SL_BLOCKS);
	} else if (*p == 'b') { /* list bad blocks */
	    read_blist(0);
	    for(i = 0; i < blocks; i++) {
		printf("%c", blist[i] == 0 ? '.' : '@');
		if (i % 64 == 63) printf("\n");
	    }
	} else if (*p == 'X') { /* checksum */
	    if ((rv = sscanf(p+1, "%s %s", file, file2)) < 1) {
		fprintf(stderr, "usage: X file [name]\n");
		goto next;
	    }
	    hbuf[0] = REQ_SUM_FILE;
	    hbuf[1] = strlen(file)+1;
	    send_cmd(hbuf, 8);
	    send_data(file, RND(strlen(file)+1));
	    read_rsp(hbuf, 8);
	    if (hbuf[0] != 255-REQ_SUM_FILE || (hbuf[1]&0x80000000)) {
		fprintf(stderr, "file sum of %s failed\n", file);
		goto next;
	    }
	    if (rv > 1) {
		FILE *fp = fopen(file2, "r");
		unsigned short s = 0;
		if (fp == NULL) {
		    perror(file2);
		    goto next;
		}
		while(fread(block, 1, sizeof block, fp) > 0) {
		    for(i = 0; i < sizeof block; i++)
			s += block[i];
		    memset(block, 0, sizeof block);
		}
		fclose(fp);
		printf("sum %04x %04x\n", hbuf[1], s);
	    } else
		printf("sum %04x\n", hbuf[1]);
	} else if (*p == 'z') { /* reformat file system */
	    int j, k;
	    read_blist(1);
	    memset(fat, 0x0, sizeof fat);
	    /* create an empty superblock */
	    mkfat(blist, (BbFat16*)fat);
	    k = (blocks/BB_FAT16_ENTRIES-1);
	    for(j = i = 0; i < BB_FAT16_BLOCKS; j++) {
		if(blist[blocks-1-j] == 0) {
		    write_block(fat+k, 0, blocks-1-j);
		    if (--k < 0)
			k = (blocks/BB_FAT16_ENTRIES-1);
		    i++;
		}
	    }
	} else if (*p == 'i') { /* run diag */
	    hbuf[0] = REQ_DBG_TEST;
	    send_cmd(hbuf, 8);
	    read_rsp(hbuf, 8);
	    if (hbuf[0] != 255-REQ_DBG_TEST || hbuf[1] != 0) {
		fprintf(stderr, "dbg_tests failed %d\n", hbuf[1]);
	    }
	} else {
	    fprintf(stderr, "unknown command '%s'\n", p);
	}
    }

#ifdef USE_READLINE
    write_history(history_file);
    history_truncate_file(history_file, 100);
#endif

    if (uhCloseGame(fd) != 0) {
	perror("uhCloseGame");
	exit(1);
    }
    return 0;
}