mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-10-22 10:24:13 +00:00
76 lines
1.4 KiB
C
76 lines
1.4 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\n\n",exe_name);
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exit(1);
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}
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int main(int argc, char **argv) {
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unsigned int track,sector;
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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;
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if (argc<4) {
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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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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(disk_image_fd,(sector*256)+(track*16*256),SEEK_SET);
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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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/* write until out of space */
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while(1) {
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result=read(file_fd,buffer,256);
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if (result<0) break;
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result=write(disk_image_fd,buffer,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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}
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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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