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mdos.c
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mdos.c
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/* MDOS diskette access
* Copyright
* (C) 2011 Joseph H. Allen
*
* This is free software; you can redistribute it and/or modify it under the
* terms of the GNU General Public License as published by the Free Software
* Foundation; either version 1, or (at your option) any later version.
*
* It 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 General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this software; see the file COPYING. If not, write to the Free Software Foundation,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* MDOS disk access */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "utils.h"
#define SECTOR_SIZE 128
#define CLUSTER_SIZE (SECTOR_SIZE * 4)
/* Specific sectors */
#define SECTOR_ID 0
#define SECTOR_CAT 1 /* Allocation bitmap */
/* Bit 7 of byte 0 is first cluster. 1 means allocated. */
#define SECTOR_LCAT 2 /* Bad block bitmap */
#define SECTOR_DIR 3
#define SECTOR_DIR_SIZE 20
#define SECTOR_BOOT_0 23
#define SECTOR_BOOT_1 24
struct rib {
unsigned char sdw[114];
unsigned char blank[3];
unsigned char last_size; /* 117 */
unsigned char size_high; /* 118 */
unsigned char size_low; /* 119 */
unsigned char addr_high; /* 120 */
unsigned char addr_low; /* 121 */
unsigned char pc_high; /* 122 */
unsigned char pc_low; /* 123 */
unsigned char blank_1[4];
};
struct dirent {
unsigned char name[8];
unsigned char suffix[2];
unsigned char sector_high;
unsigned char sector_low;
unsigned char attr_high;
unsigned char attr_low;
unsigned char blank[2];
};
FILE *disk;
void getsect(unsigned char *buf, int sect)
{
fseek(disk, sect * SECTOR_SIZE, SEEK_SET);
fread((char *)buf, SECTOR_SIZE, 1, disk);
}
void putsect(unsigned char *buf, int sect)
{
fseek(disk, sect * SECTOR_SIZE, SEEK_SET);
fwrite((char *)buf, SECTOR_SIZE, 1, disk);
}
int lower(int c)
{
if (c >= 'A' && c <= 'Z')
return c - 'A' + 'a';
else
return c;
}
struct name
{
char *name;
/* From RIB */
int last_size;
int size;
int pc;
int load;
/* Calculated from RIB */
int sects;
int system;
int write_protect;
int delete_protect;
int compr;
int cont;
int type;
int is_cm; /* If suffix is .CM */
int sector; /* Sector no. of RIB */
};
struct name *names[(SECTOR_DIR_SIZE * SECTOR_SIZE) / sizeof(struct dirent)];
int name_n;
int comp(struct name **l, struct name **r)
{
return strcmp((*l)->name, (*r)->name);
}
int calc_sects(struct rib *r)
{
int total = 0; /* Count rib */
int x;
for (x = 0; x != sizeof(r->sdw); x += 2) {
int sdw = ((r->sdw[x] << 8) + r->sdw[x + 1]);
if (sdw & 0x8000) {
/* printf("Total = %d\n", total * 4);
printf("Logical last = %d\n", (sdw & 0x7FFF)); */
return (sdw & 0x7FFF) + 1; /* Size in sectors */
break;
}
total += ((sdw >> 10) & 0x1F) + 1;
}
return total * 4; /* clusters to sectors */
}
void dump_rib(struct rib *r)
{
int x;
printf("Dumping rib:\n");
for (x = 0; x != sizeof(r->sdw); x += 2) {
int sdw = ((r->sdw[x] << 8) + r->sdw[x + 1]);
if (sdw & 0x8000) {
printf("End mark found: last logical sector is %d\n", (sdw & 0x7FFF));
return;
} else {
int clust = (sdw & 0x3FF);
//int sect = clust * 4;
int siz = ((sdw >> 10) & 0x1F) + 1;
//int len = (((sdw >> 10) & 0x1F) + 1) * 4;
printf("Segment start=%d, size=%d\n", clust, siz);
}
}
}
int no_convert;
int force_convert;
void read_file(int sector, int type, FILE *f)
{
unsigned char rib_buf[SECTOR_SIZE];
struct rib *r = (struct rib *)rib_buf;
int x;
int secno = 0;
unsigned char last_size;
unsigned short size;
unsigned short ribsize;
getsect(rib_buf, sector);
ribsize = (r->size_high << 8) + r->size_low; /* Only valid for loadable type == 2 files */
size = calc_sects(r); /* Should be valid for all file types.. */
last_size = r->last_size;
/* printf("Size is %d sectors, %d bytes in last, total=%d bytes\n", size, last_size,
(size - 1) * SECTOR_SIZE + last_size); */
if (type == 2)
fprintf(stderr,"Load=$%4.4x, Start=$%4.4x\n",(r->addr_high << 8) + r->addr_low,
(r->pc_high << 8) + r->pc_low);
for (x = 0; x != sizeof(r->sdw); x += 2) {
int sdw = ((r->sdw[x] << 8) + r->sdw[x + 1]);
if (sdw & 0x8000) {
return;
} else {
int clust = (sdw & 0x3FF);
int sect = clust * 4;
int len = (((sdw >> 10) & 0x1F) + 1) * 4;
int x;
/* printf("Clust = %d, Sect=%d, len=%d\n", clust, sect, len); */
for (x = 0; x != len; ++x) {
unsigned char buf[SECTOR_SIZE];
int n;
if (sect + x != sector) { /* Not RIB sector */
/* printf("Sector %d:\n", sect + x); */
getsect(buf, sect + x);
if ((type == 5 && !no_convert) || force_convert) {
int ends = SECTOR_SIZE;
if (secno + 1 == size) {
/* Last sector of file, truncate trailing NULs */
while (ends && buf[ends-1] == 0) --ends;
}
/* Convert line end of ASCII file to MS-DOS unless no_convert is set */
for (n = 0; n != ends; ++n) {
int c = buf[n];
if (c & 0x80) { // Expand compressed spaces
int z;
for (z = 0; z != (c & 0x7F); ++z)
fputc(' ', f);
} else if (c == 13) {
/* Convert to MS-DOS */
fputc('\r', f);
fputc('\n', f);
} else if (c == 10) {
/* Delete Line Feeds */
} else if (c == 0) {
/* Delete NULs */
} else {
fputc(c, f);
}
}
/* printf("EOS\n"); */
} else if (type == 2) {
/* Binary image file. Exact size is in RIB */
if (secno + 1 == ribsize) {
/* printf("Sector %d, size=%d\n", secno, last_size); */
/* Last sector */
fwrite(buf, last_size, 1, f);
return;
} else {
/* printf("Sector %d, size=128\n", secno); */
fwrite(buf, SECTOR_SIZE, 1, f);
}
} else {
/* Unknown file. Send all sectors out as-is. */
fwrite(buf, SECTOR_SIZE, 1, f);
}
secno++;
if (secno == size)
return;
}
}
}
}
}
/* Read first byte of file - to guess if it's an object file */
int read_first(int sector)
{
unsigned char rib_buf[SECTOR_SIZE];
struct rib *r = (struct rib *)rib_buf;
int x;
getsect(rib_buf, sector);
for (x = 0; x != sizeof(r->sdw); x += 2) {
int sdw = ((r->sdw[x] << 8) + r->sdw[x + 1]);
if (sdw & 0x8000) {
return -1;
} else {
int clust = (sdw & 0x3FF);
int sect = clust * 4;
int len = (((sdw >> 10) & 0x1F) + 1) * 4;
int y;
for (y = 0; y != len; ++y) {
unsigned char buf[SECTOR_SIZE];
if (sect + y != sector) { /* Not RIB sector */
getsect(buf, sect + y);
return buf[0];
}
}
}
}
return -1;
}
/* Count free clusters */
int amount_free(unsigned char *cat)
{
int total = 0;
int x;
for (x = 0; x != (SECTOR_SIZE * 8); ++x) {
if (!(cat[x >> 3] & (1 << (7 - (x & 7)))))
++total;
}
return total;
}
/* Free command */
int do_free(void)
{
int amount;
unsigned char cat[SECTOR_SIZE];
getsect(cat, SECTOR_CAT);
amount = amount_free(cat);
printf("%d free sectors, %d free bytes\n", amount * 4, amount * 512);
return 0;
}
/* Mark a segment as clear or free */
void mark_space(unsigned char *cat, int start, int size, int alloc)
{
int x;
for (x = start; x != start + size; ++x) {
if (alloc)
cat[x >> 3] |= (1 << (7 - (x & 7)));
else
cat[x >> 3] &= ~(1 << (7 - (x & 7)));
}
}
/* Allocate n clusters. Returns with amount actually allocated and starting cluster in *start */
int find_space(unsigned char *cat, int n, int *start)
{
int x;
int bestfirst = -1;
int bestsize = 0;
int curfirst = -1;
int cursize;
printf("Find space %d\n", n);
/* Find first contiguous block which fits requested size */
/* Note longest contiguous block along the way */
for (x = 0; x != SECTOR_SIZE * 8; ++x) {
if ((1 << (7 - (x & 7)) & cat[x >> 3])) {
/* This cluster is allocated */
if (curfirst != -1) {
/* We're in a segment, note it */
printf("Found segment: start=%d, size=%d\n", curfirst, cursize);
if (cursize > bestsize) {
bestsize = cursize;
bestfirst = curfirst;
}
curfirst = -1;
cursize = 0;
} else {
/* Not in segment, do nothing */
}
} else {
/* This cluster is free */
if (curfirst != -1) {
/* We're in a segment: extend it */
++cursize;
if (cursize == n || cursize == 32) goto done;
} else {
/* We're not in a segment, start one */
curfirst = x;
cursize = 1;
if (cursize == n) goto done;
}
}
}
done:
/* In a segment? Finalize it. */
if (curfirst != -1) {
printf("Found segment: start=%d, size=%d\n", curfirst, cursize);
if (cursize > bestsize) {
bestfirst = curfirst;
bestsize = cursize;
}
}
*start = bestfirst;
return bestsize;
}
/* Allocate space, build RIB */
int alloc_space(unsigned char *cat, struct rib *r, int sects)
{
int req = (sects + 3) / 4; /* Number of clusters to allocate */
int seg = 0; /* Segment pointer in RIB */
int sdw;
/* printf("Amount avail = %d clusters.\n", amount_free(cat)); */
while (req) {
int start = -1;
int found;
if (seg == 114) {
printf("Too many segments\n");
return -1;
}
found = find_space(cat, req, &start);
/* printf("Segment=%d Size=%d\n", start, found); */
if (found) {
mark_space(cat, start, found, 1);
/* Add segment to rib */
sdw = start + ((found - 1) << 10);
r->sdw[seg] = (sdw >> 8);
r->sdw[seg + 1] = sdw;
seg += 2;
}
req -= found;
if (!req) {
/* printf("Done\n"); */
} else if (!found) {
printf("Not enough space\n");
return -1;
}
}
if (seg == 114) {
printf("Too many segments\n");
return -1;
}
/* Add end mark */
sdw = 0x8000 + sects - 2; /* Last sector does not count rib */
r->sdw[seg] = (sdw >> 8);
r->sdw[seg + 1] = sdw;
/* Need to write back cat here */
/* Success */
return 0;
}
/* Convert logical sector number to physical sector number */
int lsn_to_psn(struct rib *r, int lsn)
{
int x;
for (x = 0; x != sizeof(r->sdw); x += 2) {
int sdw = ((r->sdw[x] << 8) + r->sdw[x + 1]);
if (sdw & 0x8000) {
printf("End mark found? Internal error.\n");
exit(-1);
} else {
int clust = (sdw & 0x3FF);
int sect = clust * 4;
int siz = ((sdw >> 10) & 0x1F) + 1;
int len = siz * 4;
if (lsn < len) {
return sect + lsn;
} else {
lsn -= len;
}
}
}
printf("End of SDW? Internal error.\n");
exit(-1);
}
/* Write a file */
int write_file(unsigned char *cat, unsigned char *buf, int sects)
{
int x;
int rib_sect;
struct rib r[1];
memset(r, 0, SECTOR_SIZE);
if (alloc_space(cat, r, sects + 1)) {
return -1;
}
putsect((unsigned char *)r, rib_sect = lsn_to_psn(r, 0));
for (x = 0; x != sects; ++x) {
printf("File to sector %x\n", lsn_to_psn(r, x + 1));
putsect(buf + SECTOR_SIZE * x, lsn_to_psn(r, x + 1));
}
printf("Rib sector = %x\n", rib_sect);
return rib_sect;
}
/* File name hash function */
int hash(unsigned char *str)
{
int x;
unsigned b;
unsigned a;
b = 0;
for (x = 0; x != 10; ++x) {
a = *str++;
if (a >= 0x25)
a -= 0x25;
else
a = 0;
b = (b & 0xFF) + a + (b >> 8);
b = (((b << 1) + (b >> 8)) & 0x1FF);
};
b = (((b >> 1) + (b << 8)) & 0x1FF);
a = b;
a = (((a >> 1) + (a << 8)) & 0x1FF);
a = (((a >> 1) + (a << 8)) & 0x1FF);
a = (((a >> 1) + (a << 8)) & 0x1FF);
a = (((a >> 1) + (a << 8)) & 0x1FF);
a = (a & 0xFF) + (b & 0xFF);
b = a;
b &= 0x1f;
if (b >= 20) {
b -= 20;
if (b < 10) {
b = (b << 1) + (a & 1);
}
}
return b;
}
/* Write directory entry */
int write_dir(char *name, int rib_sect, int attr)
{
struct dirent d[1];
int x;
int hsh;
int count;
unsigned char dir_buf[SECTOR_SIZE];
/* Copy file name into directory entry */
x = 0;
while (*name && *name != '.' && x < 8) {
if (*name >= 'a' && *name <= 'z')
d->name[x++] = *name++ - 'a' + 'A';
else
d->name[x++] = *name++;
}
while (x < 8) {
d->name[x++] = ' ';
}
x = 0;
while (*name && *name != '.')
++name;
if (*name == '.') {
++name;
while (*name && x < 2) {
if (*name >= 'a' && *name <= 'z')
d->suffix[x++] = *name++ - 'a' + 'A';
else
d->suffix[x++] = *name++;
}
} else {
d->name[x++] = 'S';
d->name[x++] = 'A';
}
while (x < 2) {
d->suffix[x++] = ' ';
}
d->sector_high = (rib_sect >> 8);
d->sector_low = rib_sect;
d->attr_high = (attr >> 8);
d->attr_low = attr;
d->blank[0] = 0;
d->blank[1] = 0;
/* Compute hash of directory entry */
hsh = hash(d->name);
/* printf("hash=%d\n", hsh); */
for (count = 0; count != 20; ++count) {
int y;
getsect(dir_buf, hsh + SECTOR_DIR);
printf("Trying directory sector %d\n", hsh + SECTOR_DIR);
for (y = 0; y != SECTOR_SIZE; y += 16) {
if (dir_buf[y] == 0x00 || dir_buf[y] == 0xFF) {
printf("OK, using entry %d\n", y);
memcpy(dir_buf + y, (char *)d, sizeof(struct dirent));
putsect(dir_buf, hsh + SECTOR_DIR);
return 0;
}
}
if (++hsh == SECTOR_DIR_SIZE)
hsh = 0;
}
printf("Out of directory entries\n");
return -1;
}
/* Delete file */
int del_file(int rib_sector)
{
int x;
unsigned char rib[SECTOR_SIZE];
struct rib *r = (struct rib *)rib;
unsigned char cat[SECTOR_SIZE];
getsect(rib, rib_sector);
getsect(cat, SECTOR_CAT);
for (x = 0; x != sizeof(r->sdw); x += 2) {
int sdw = ((r->sdw[x] << 8) + r->sdw[x + 1]);
if (sdw & 0x8000) {
break;
} else {
int clust = (sdw & 0x3FF);
int siz = ((sdw >> 10) & 0x1F) + 1;
mark_space(cat, clust, siz, 0);
}
}
putsect(cat, SECTOR_CAT);
return 0;
}
/* Find a file, return sector number of its rib */
int find_file(char *filename, int *type, int del)
{
unsigned char buf[SECTOR_SIZE];
int x;
for (x = SECTOR_DIR; x != SECTOR_DIR + SECTOR_DIR_SIZE; ++x) {
int y;
getsect(buf, x);
for (y = 0; y != SECTOR_SIZE; y += sizeof(struct dirent)) {
struct dirent *d = (struct dirent *)(buf + y);
if (d->name[0] && d->name[0] != 0xFF) {
//struct rib *rib = (struct rib *)rib_buf;
char s[50];
int p = 0;
int i;
for (i = 0; i != sizeof(d->name); i++) {
s[p++] = lower(d->name[i]);
}
while (p && s[p - 1] == ' ') --p;
s[p++] = '.';
for (i = 0; i != sizeof(d->suffix); i++) {
s[p++] = lower(d->suffix[i]);
}
while (p && s[p - 1] == ' ') --p;
s[p] = 0;
if (!jstricmp(s, filename)) {
if (type)
*type = (d->attr_high & 7);
if (del) {
d->name[0] = 0xFF;
d->name[1] = 0xFF;
putsect(buf, x);
}
return (d->sector_high << 8) + d->sector_low;
}
}
}
}
return -1;
}
/* Delete file name */
int rm(char *name)
{
int type;
int rib = find_file(name, &type, 1);
if (rib != -1) {
if (del_file(rib)) {
printf("Error deleting file '%s'\n", name);
return -1;
} else {
} return 0;
} else {
printf("File '%s' not found\n", name);
return -1;
}
}
/* Put a file on the disk */
int put_file(char *local_name, char *mdos_name)
{
FILE *f = fopen(local_name, "r");
long size;
long up;
long x;
int c;
unsigned char *buf;
unsigned char cat[SECTOR_SIZE];
int rib_sect;
if (!f) {
printf("Couldn't open '%s'\n", local_name);
return -1;
}
if (fseek(f, 0, SEEK_END)) {
printf("Couldn't get file size of '%s'\n", local_name);
fclose(f);
return -1;
}
size = ftell(f);
if (size < 0) {
printf("Couldn't get file size of '%s'\n", local_name);
fclose(f);
return -1;
}
rewind(f);
up = ((size + SECTOR_SIZE - 1) & ~(long)(SECTOR_SIZE - 1));
buf = (unsigned char *)malloc(up);
/* Read file, convert UNIX or MS-DOS ASCII to MDOS ASCII */
x = 0;
while ((c = fgetc(f)) != -1)
{
if (c == '\n') {
/* MDOS line terminator is CR */
buf[x++] = '\r';
} else if (c == '\r') {
/* Ignore carriage returns */
} else {
buf[x++] = c;
}
}
size = x;
fclose(f);
/* Round up to sector size again */
up = ((size + SECTOR_SIZE - 1) & ~(long)(SECTOR_SIZE - 1));
/* Fill with NULs to end of sector */
while (x != up)
buf[x++] = 0;
/* Delete existing file */
rm(mdos_name);
/* Get cat... */
getsect(cat, SECTOR_CAT);
/* Allocate space and write file */
rib_sect = write_file(cat, buf, up / SECTOR_SIZE);
if (rib_sect == -1) {
printf("Couldn't write file\n");
return -1;
}
if (write_dir(mdos_name, rib_sect, 0x0500)) {
printf("Couldn't write directory entry\n");
return -1;
}
/* Success! */
putsect(cat, SECTOR_CAT);
return 0;
}
/* Directory listing */
char *typestr[]=
{
"0 User defined",
"1 Unknown",
"2 Image",
"3 Object",
"4 Unknown",
"5 ASCII",
"6 Unknown",
"7 ASCII coverted"
};
int fixcopy;
void mdos_load_dir(int all, int only_ascii)
{
unsigned char buf[SECTOR_SIZE];
unsigned char rib_buf[SECTOR_SIZE];
int x;
for (x = SECTOR_DIR; x != SECTOR_DIR + SECTOR_DIR_SIZE; ++x) {
int y;
getsect(buf, x);
for (y = 0; y != SECTOR_SIZE; y += sizeof(struct dirent)) {
struct dirent *d = (struct dirent *)(buf + y);
if (d->name[0] && d->name[0] != 0xFF) {
struct name *nam;
struct rib *rib = (struct rib *)rib_buf;
char s[50];
int p = 0;
int i;
for (i = 0; i != sizeof(d->name); i++) {
s[p++] = lower(d->name[i]);
}
while (p && s[p - 1] == ' ') --p;
s[p++] = '.';
for (i = 0; i != sizeof(d->suffix); i++) {
s[p++] = lower(d->suffix[i]);
}
while (p && s[p - 1] == ' ') --p;
s[p] = 0;
nam = (struct name *)malloc(sizeof(struct name));
nam->name = strdup(s);
nam->type = (d->attr_high & 7);
if (d->suffix[0] == 'C' && d->suffix[1] == 'M')
nam->is_cm = 1;
else
nam->is_cm = 0;
if (d->attr_high & 0x80)
nam->write_protect = 1;
else
nam->write_protect = 0;
if (d->attr_high & 0x40)
nam->delete_protect = 1;
else
nam->delete_protect = 0;
if (d->attr_high & 0x20)
nam->system = 1;
else
nam->system = 0;
if (d->attr_high & 0x10)
nam->cont = 1;
else
nam->cont = 0;
if (d->attr_high & 0x08)
nam->compr = 1;
else
nam->compr = 0;
nam->sector = (d->sector_high << 8) + d->sector_low;
/* Get RIB */
getsect(rib_buf, nam->sector);
/* Only valid for loadable files */
nam->size = (rib->size_high << 8) + rib->size_low;
nam->pc = (rib->pc_high << 8) + rib->pc_low;
nam->load = (rib->addr_high << 8) + rib->addr_low;
nam->last_size = rib->last_size;
nam->sects = calc_sects(rib); /* Size in sectors */
#if 0
printf("\nName=%s\n", nam->name);
printf("Size in sectors=%d, %d bytes\n", nam->sects, nam->sects * SECTOR_SIZE);
printf("load size=%d sectors, %d bytes\n", nam->size, (nam->size - 1) * SECTOR_SIZE + nam->last_size);
printf("Initial pc=%x\n", nam->pc);
printf("Load addr=%x\n", nam->load);
printf("Last_size=%d\n", nam->last_size);
#endif
if ((all || !nam->system) && (!only_ascii || nam->type == 5))
names[name_n++] = nam;
if (fixcopy && d->suffix[0] == 'E' && d->suffix[1] == 'D' && read_first(nam->sector) != 'D')
{
/* Set file type to 5 */
d->attr_high = ((d->attr_high & ~7) | 5);
printf(" Changed %s to ASCII\n", nam->name);
putsect(buf, x);
}
}
}
}
qsort(names, name_n, sizeof(struct name *), (int (*)(const void *, const void *))comp);
}
void mdos_dir(int all, int full, int single, int only_ascii)
{
int x, y;
int rows;
int cols = (80 / 13);
mdos_load_dir(all, only_ascii);
if (full) {
int totals = 0;
printf("\n");
for (x = 0; x != name_n; ++x) {
if (names[x]->type == 2) {
printf("-r%c%c%c%c%c%c %6d %-13s (%s) Load=$%4.4x, Jump=$%4.4x\n",
(names[x]->write_protect ? '-' : 'w'),
(names[x]->is_cm ? 'x' : '-'),
(names[x]->system ? 's' : '-'),
(names[x]->delete_protect ? 'd' : '-'),
(names[x]->cont ? 'c' : '-'),
(names[x]->compr ? 'z' : '-'),
(names[x]->size - 1) * SECTOR_SIZE + names[x]->last_size, names[x]->name,
typestr[names[x]->type], names[x]->load, names[x]->pc);
totals += names[x]->sects;
} else {
printf("-r%c%c%c%c%c%c %6d %-13s (%s)\n",
(names[x]->write_protect ? '-' : 'w'),
(names[x]->is_cm ? 'x' : '-'),
(names[x]->system ? 's' : '-'),
(names[x]->delete_protect ? 'd' : '-'),
(names[x]->cont ? 'c' : '-'),
(names[x]->compr ? 'z' : '-'),
names[x]->sects * SECTOR_SIZE, names[x]->name,
typestr[names[x]->type]);
totals += names[x]->sects;
}
}
printf("\n%d entries\n", name_n);
printf("\n%d sectors, %d bytes\n", totals, totals * SECTOR_SIZE);
printf("\n");
do_free();
printf("\n");
} else if (single) {
int x;
for (x = 0; x != name_n; ++x) {
printf("%s\n", names[x]->name);
}
} else {
/* Rows of 12 names each ordered like ls */
rows = (name_n + cols - 1) / cols;
for (y = 0; y != rows; ++y) {
for (x = 0; x != cols; ++x) {
int n = y + x * rows;
/* printf("%11d ", n); */
if (n < name_n)
printf("%-11s ", names[n]->name);
else
printf(" ");
}
printf("\n");
}
}
}
/* cat a file */
void cat(char *name)
{
int type;
int sector = find_file(name, &type, 0);
if (sector == -1) {
printf("File '%s' not found\n", name);
exit(-1);
} else {
/* printf("Found file. Sector of rib is %d\n", sector); */
read_file(sector, type, stdout);
}
}
/* get a file from the disk */
int get_file(char *mdos_name, char *local_name)
{
int type;
int sector = find_file(mdos_name, &type, 0);
if (sector == -1) {
printf("File '%s' not found\n", mdos_name);
return -1;
} else {
FILE *f = fopen(local_name, "w");
if (!f) {
printf("Couldn't open local file '%s'\n", local_name);
return -1;
}
/* printf("Found file. Sector of rib is %d\n", sector); */
read_file(sector, type, f);
if (fclose(f)) {
printf("Couldn't close local file '%s'\n", local_name);
return -1;
}
return 0;
}
}
int extract_name(char *mdos, char *local)
{
char *start = 0;
int x;
/* Find last part of path */
for (x = 0; local[x]; ++x)
if (local[x] == '/')
start = local + x;
/* Point to start of name */
if (start)
++start;
else
start = local;
x = 0;
/* Copy name */
if (!((start[x] >= 'a' && start[x] <= 'z') ||
(start[x] >= 'A' && start[x] <= 'Z')))
{
printf("MDOS name must start with letter\n");
return -1;
}
for (; start[x] && start[x] != '.' && x != 8; ++x)
{
if (!((start[x] >= 'a' && start[x] <= 'z') ||
(start[x] >= 'A' && start[x] <= 'Z') ||
(start[x] >= '0' && start[x] <= '9')))
{
printf("MDOS name must be made of letter or numbers\n");
return -1;
}
mdos[x] = start[x];
}
if (x == 8 && start[x] != '.') {
printf("MDOS name is too long\n");
return -1;
}
if (x == 0) {
printf("MDOS name is too short\n");
return -1;
}
if (start[x] == '.') {
int count;
/* Copy the . */
mdos[x] = start[x];
++x;
if (!((start[x] >= 'a' && start[x] <= 'z') ||
(start[x] >= 'A' && start[x] <= 'Z')))
{
printf("MDOS extension must start with letter\n");
return -1;