114 lines
2.2 KiB
C
114 lines
2.2 KiB
C
#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <string.h>
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#include <unistd.h>
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/* usage: dos33_raw track sector file */
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static void usage(char *exe_name) {
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printf("Usage:\n");
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printf("\t%s disk_image track sector file start count\n\n",exe_name);
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exit(1);
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}
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static int dos33_sector_map[16]={
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0, 7, 14, 6, 13, 5, 12, 4, 11, 3, 10, 2, 9, 1, 8, 15
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};
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static int goto_dos_track_sector(int fd, int track, int sector) {
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int result,translated_sector;
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translated_sector=dos33_sector_map[sector%16];
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result=lseek(fd,(translated_sector*256)+(track*16*256),SEEK_SET);
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printf("going to: T=%d S=%d (%d)\n",track,sector,translated_sector);
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return result;
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}
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int main(int argc, char **argv) {
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unsigned int track,sector,start,count,total;
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int disk_image_fd;
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int file_fd;
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unsigned char buffer[256];
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int result,read_result;
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if (argc<6) {
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usage(argv[0]);
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}
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track=atoi(argv[2]);
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sector=atoi(argv[3]);
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start=atoi(argv[5]);
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count=atoi(argv[6]);
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/* FIXME: check limits based on stat of file */
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if (track>34) {
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fprintf(stderr,"Warning! Unusual track number %d\n",track);
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}
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if (track>15) {
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fprintf(stderr,"Warning! Unusual sector number %d\n",sector);
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}
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disk_image_fd=open(argv[1],O_RDWR);
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if (disk_image_fd<0) {
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fprintf(stderr,"Error opening %s: %s\n",
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argv[1],strerror(errno));
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exit(1);
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}
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file_fd=open(argv[4],O_RDONLY);
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if (file_fd<0) {
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fprintf(stderr,"Error opening %s: %s\n",
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argv[4],strerror(errno));
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exit(1);
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}
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result=lseek(file_fd,(start*256),SEEK_SET);
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if (result<0) {
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fprintf(stderr,"Error skipping: %s\n",strerror(errno));
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exit(1);
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}
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total=0;
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/* write until out of space */
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while(1) {
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if (total>=count) break;
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read_result=read(file_fd,buffer,256);
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if (read_result<0) break; /* error */
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if (read_result==0) break; /* done */
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result=goto_dos_track_sector(disk_image_fd,track,sector);
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if (result<0) {
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fprintf(stderr,"Error seeking: %s\n",strerror(errno));
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exit(1);
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}
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result=write(disk_image_fd,buffer,read_result);
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if (result<0) {
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fprintf(stderr,"Error writing image: %s\n",
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strerror(errno));
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break;
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}
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total++;
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sector++;
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if (sector==16) {
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sector=0;
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track++;
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}
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}
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close(file_fd);
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close(disk_image_fd);
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return 0;
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}
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