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dos33: more robust error checking

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This was inspired by a request from Micah Cowan

hopefully this didn't break anything
This commit is contained in:
Vince Weaver 2022-06-09 19:53:10 -04:00
parent 0007cbe3a9
commit cbdb595f63
3 changed files with 105 additions and 30 deletions
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117
utils/dos33fs-utils/dos33.c
View File

@ -36,7 +36,7 @@ static int dos33_read_vtoc(int fd, unsigned char *vtoc) {
/* read in VTOC */
result=read(fd,vtoc,BYTES_PER_SECTOR);
if (result<0) {
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"Error reading VTOC: %s\n",strerror(errno));
return -ERROR_VTOC;
}
@ -59,7 +59,8 @@ static int dos33_check_file_exists(int fd,
unsigned char catalog_buffer[BYTES_PER_SECTOR];
/* read the VTOC into buffer */
dos33_read_vtoc(fd,vtoc);
result=dos33_read_vtoc(fd,vtoc);
if (result<0) return result;
/* FIXME: we have a function for this */
/* get the catalog track and sector from the VTOC */
@ -71,6 +72,9 @@ repeat_catalog:
/* Read in Catalog Sector */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,catalog_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
/* scan all file entries in catalog sector */
for(i=0;i<7;i++) {
@ -107,8 +111,6 @@ repeat_catalog:
if (catalog_sector!=0) goto repeat_catalog;
if (result<0) fprintf(stderr,"Error on I/O\n");
return -ERROR_FILE_NOT_FOUND;
}
@ -123,7 +125,7 @@ static int dos33_free_sector(unsigned char *vtoc,int fd,int track,int sector) {
lseek(fd,DISK_OFFSET(VTOC_TRACK,VTOC_SECTOR),SEEK_SET);
result=write(fd,vtoc,BYTES_PER_SECTOR);
if (result<0) {
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"dos33_free_sector: error writing VTOC\n");
return -ERROR_VTOC;
}
@ -157,7 +159,7 @@ static int dos33_allocate_sector(int fd, unsigned char *vtoc) {
/* Write out VTOC */
result=write(fd,vtoc,BYTES_PER_SECTOR);
if (result<0) {
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"Error on I/O\n");
return -ERROR_VTOC;
}
@ -285,6 +287,9 @@ static int dos33_add_file(unsigned char *vtoc,
lseek(fd,DISK_OFFSET((ts_list>>8)&0xff,ts_list&0xff),SEEK_SET);
result=write(fd,ts_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_WRITE;
}
if (i==0) {
initial_ts_list=ts_list;
@ -299,6 +304,9 @@ static int dos33_add_file(unsigned char *vtoc,
SEEK_SET);
result=read(fd,ts_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
/* point from old ts list to new one we just made */
ts_buffer[TSL_NEXT_TRACK]=get_high_byte(ts_list);
@ -311,16 +319,20 @@ static int dos33_add_file(unsigned char *vtoc,
SEEK_SET);
result=write(fd,ts_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_WRITE;
}
}
}
/* allocate a sector */
data_ts=dos33_allocate_sector(fd,vtoc);
sectors_used++;
/* handle error */
if (data_ts<0) return data_ts;
sectors_used++;
/* clear data sector */
memset(data_buffer,0,BYTES_PER_SECTOR);
@ -331,24 +343,35 @@ static int dos33_add_file(unsigned char *vtoc,
data_buffer[1]=(address>>8)&0xff;
data_buffer[2]=(length)&0xff;
data_buffer[3]=((length)>>8)&0xff;
bytes_read=read(input_fd,data_buffer+4,
result=read(input_fd,data_buffer+4,
BYTES_PER_SECTOR-4);
bytes_read+=4;
bytes_read=result+4;
}
else {
bytes_read=read(input_fd,data_buffer,
result=read(input_fd,data_buffer,
BYTES_PER_SECTOR);
bytes_read=result;
}
first_write=0;
if (bytes_read<0) fprintf(stderr,"Error reading bytes!\n");
/* Note, we might not read a full sector worth */
/* if the file is smaller */
if (result<0) {
fprintf(stderr,"Error reading input file!\n");
return -ERROR_FILE_READ;
}
first_write=0;
/* write to disk image */
lseek(fd,DISK_OFFSET((data_ts>>8)&0xff,data_ts&0xff),SEEK_SET);
result=write(fd,data_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_WRITE;
}
if (debug) {
printf("Writing %i bytes to %i/%i\n",
printf("Wrote %i bytes to %i/%i\n",
bytes_read,(data_ts>>8)&0xff,data_ts&0xff);
}
@ -357,6 +380,9 @@ static int dos33_add_file(unsigned char *vtoc,
/* read in t/s list */
lseek(fd,DISK_OFFSET((ts_list>>8)&0xff,ts_list&0xff),SEEK_SET);
result=read(fd,ts_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
/* point to new data sector */
ts_buffer[((i%TSL_MAX_NUMBER)*2)+TSL_LIST]=(data_ts>>8)&0xff;
@ -365,6 +391,9 @@ static int dos33_add_file(unsigned char *vtoc,
/* write t/s list back out */
lseek(fd,DISK_OFFSET((ts_list>>8)&0xff,ts_list&0xff),SEEK_SET);
result=write(fd,ts_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_WRITE;
}
i++;
}
@ -448,7 +477,7 @@ got_a_dentry:
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=write(fd,catalog_buffer,BYTES_PER_SECTOR);
if (result<0) {
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"Error on I/O\n");
return -ERROR_CATALOG;
}
@ -485,6 +514,9 @@ static int dos33_load_file(int fd,int fts,char *filename) {
/* Read in Catalog Sector */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
tsl_track=sector_buffer[CATALOG_FILE_LIST+
(catalog_file*CATALOG_ENTRY_SIZE)+FILE_TS_LIST_T];
@ -500,6 +532,10 @@ keep_saving:
/* Read in TSL Sector */
lseek(fd,DISK_OFFSET(tsl_track,tsl_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
tsl_pointer=0;
/* check each track/sector pair in the list */
@ -517,6 +553,9 @@ keep_saving:
else {
lseek(fd,DISK_OFFSET(data_t,data_s),SEEK_SET);
result=read(fd,&data_sector,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
/* some file formats have the size in the first sector */
/* so cheat and get real file size from file itself */
@ -540,6 +579,9 @@ keep_saving:
/* write the block read in out to the output file */
lseek(output_fd,output_pointer*BYTES_PER_SECTOR,SEEK_SET);
result=write(output_fd,&data_sector,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_WRITE;
}
last_output_pointer=output_pointer+1;
}
output_pointer++;
@ -610,6 +652,9 @@ static int dos33_lock_file(int fd,int fts,int lock) {
/* Read in Catalog Sector */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
file_type=sector_buffer[CATALOG_FILE_LIST+
(catalog_file*CATALOG_ENTRY_SIZE)
@ -626,7 +671,7 @@ static int dos33_lock_file(int fd,int fts,int lock) {
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
if (result<0) {
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"Error on I/O\n");
return -ERROR_CATALOG;
}
@ -651,6 +696,9 @@ static int dos33_rename_file(int fd,int fts,char *new_name) {
/* Read in Catalog Sector */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
/* copy over filename */
for(x=0;x<strlen(new_name);x++) {
@ -670,7 +718,7 @@ static int dos33_rename_file(int fd,int fts,char *new_name) {
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
if (result<0) {
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"Error on I/O\n");
return -ERROR_CATALOG;
}
@ -694,6 +742,9 @@ static int dos33_undelete_file(int fd,int fts,char *new_name) {
/* Read in Catalog Sector */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
/* get the stored track value, and put it back */
/* FIXME: should walk file to see if T/s valild */
@ -716,7 +767,7 @@ static int dos33_undelete_file(int fd,int fts,char *new_name) {
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=write(fd,sector_buffer,BYTES_PER_SECTOR);
if (result<0) {
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"Error on I/O\n");
return -ERROR_CATALOG;
}
@ -747,6 +798,9 @@ static int dos33_delete_file(unsigned char *vtoc,int fd,int fsl) {
/* Load in the catalog table for the file */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,catalog_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
file_type=catalog_buffer[CATALOG_FILE_LIST+
(catalog_entry*CATALOG_ENTRY_SIZE)
@ -773,8 +827,9 @@ keep_deleting:
/* load in the t/s list info */
lseek(fd,DISK_OFFSET(ts_track,ts_sector),SEEK_SET);
result=read(fd,catalog_buffer,BYTES_PER_SECTOR);
if (result<0) {
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"delete: error reading catalog\n");
return -ERROR_FILE_READ;
}
/* Free each sector listed by t/s list */
@ -826,8 +881,9 @@ keep_deleting:
}
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,catalog_buffer,BYTES_PER_SECTOR);
if (result<0) {
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"delete: error reading catalog\n");
return -ERROR_FILE_READ;
}
/* save track as last char of name, for undelete purposes */
@ -843,7 +899,7 @@ keep_deleting:
/* re seek to catalog position and write out changes */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=write(fd,catalog_buffer,BYTES_PER_SECTOR);
if (result<0) {
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"delete: error writing catalog\n");
return -ERROR_CATALOG;
}
@ -855,10 +911,13 @@ keep_deleting:
static int dos33_rename_hello(int fd, char *new_name) {
char buffer[BYTES_PER_SECTOR];
int i;
int i,result;
lseek(fd,DISK_OFFSET(1,9),SEEK_SET);
read(fd,buffer,BYTES_PER_SECTOR);
result=read(fd,buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_READ;
}
for(i=0;i<30;i++) {
if (i<strlen(new_name)) {
@ -870,7 +929,10 @@ static int dos33_rename_hello(int fd, char *new_name) {
}
lseek(fd,DISK_OFFSET(1,9),SEEK_SET);
write(fd,buffer,BYTES_PER_SECTOR);
result=write(fd,buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
return -ERROR_FILE_WRITE;
}
return 0;
}
@ -1049,14 +1111,16 @@ int main(int argc, char **argv) {
fprintf(stderr,"Error opening disk_image: %s\n",image);
return -ERROR_FILE_NOT_FOUND;
}
dos33_read_vtoc(dos_fd,vtoc);
retval=dos33_read_vtoc(dos_fd,vtoc);
if (retval<0) goto exit_and_close;
/* Move to next argument */
optind++;
if (optind==argc) {
fprintf(stderr,"ERROR! Must specify command!\n\n");
return -2;
retval=-ERROR_INVALID_PARAMATER;
goto exit_and_close;
}
/* Grab command */
@ -1130,6 +1194,8 @@ int main(int argc, char **argv) {
case COMMAND_CATALOG:
retval=dos33_read_vtoc(dos_fd,vtoc);
if (retval<0) return retval;
dos33_catalog(dos_fd,vtoc);
break;
@ -1213,6 +1279,7 @@ int main(int argc, char **argv) {
result_string=fgets(temp_string,BUFSIZ,stdin);
if ((result_string==NULL) || (temp_string[0]!='y')) {
printf("Exiting early...\n");
retval=-ERROR_INVALID_PARAMATER;
goto exit_and_close;
}
}

3
utils/dos33fs-utils/dos33.h
View File

@ -68,6 +68,7 @@
#define ERROR_CATALOG 8
#define ERROR_FILE_WRITE 9
#define ERROR_INVALID_PARAMATER 10
#define ERROR_FILE_READ 11
/* dos33_vtoc_bitmap.c */
int dos33_vtoc_free_space(unsigned char *vtoc);
@ -79,7 +80,7 @@ int dos33_vtoc_find_free_sector(unsigned char *vtoc,
/* dos33_catalog.c */
unsigned char dos33_char_to_type(char type, int lock);
void dos33_catalog(int dos_fd, unsigned char *vtoc);
int dos33_catalog(int dos_fd, unsigned char *vtoc);
char *dos33_filename_to_ascii(char *dest,unsigned char *src,int len);
unsigned char dos33_file_type(int value);

15
utils/dos33fs-utils/dos33_catalog.c
View File

@ -156,6 +156,10 @@ static int dos33_print_file_info(int fd,int catalog_tsf) {
/* Read in Catalog Sector */
lseek(fd,DISK_OFFSET(catalog_track,catalog_sector),SEEK_SET);
result=read(fd,sector_buffer,BYTES_PER_SECTOR);
if (result<BYTES_PER_SECTOR) {
fprintf(stderr,"Error on I/O\n");
return -ERROR_FILE_READ;
}
if (sector_buffer[CATALOG_FILE_LIST+(catalog_file*CATALOG_ENTRY_SIZE)+FILE_TYPE]>0x7f) {
printf("*");
@ -183,14 +187,13 @@ static int dos33_print_file_info(int fd,int catalog_tsf) {
printf("\n");
if (result<0) fprintf(stderr,"Error on I/O\n");
return 0;
}
void dos33_catalog(int dos_fd, unsigned char *vtoc) {
int dos33_catalog(int dos_fd, unsigned char *vtoc) {
int catalog_entry;
int result;
/* get first catalog */
catalog_entry=dos33_get_catalog_ts(vtoc);
@ -200,11 +203,15 @@ void dos33_catalog(int dos_fd, unsigned char *vtoc) {
catalog_entry=dos33_find_next_file(dos_fd,catalog_entry,vtoc);
if (debug) fprintf(stderr,"CATALOG entry=$%X\n",catalog_entry);
if (catalog_entry>0) {
dos33_print_file_info(dos_fd,catalog_entry);
result=dos33_print_file_info(dos_fd,catalog_entry);
if (result<0) return result;
/* why 1<<16 ? */
catalog_entry+=(1<<16);
/* dos33_find_next_file() handles wrapping issues */
}
}
printf("\n");
return 0;
}