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- /*
- * Display contents of a MSDOS file
- *
- * Emmet P. Gray US Army, HQ III Corps & Fort Hood
- * ...!uunet!uiucuxc!fthood!egray Attn: AFZF-DE-ENV
- * Directorate of Engineering & Housing
- * Environmental Management Office
- * Fort Hood, TX 76544-5057
- */
-
- #include <stdio.h>
- #include "msdos.h"
-
- int fd; /* the file descriptor for the floppy */
- int dir_start; /* starting sector for directory */
- int dir_len; /* length of directory (in sectors) */
- int dir_entries; /* number of directory entries */
- int dir_chain[25]; /* chain of sectors in directory */
- int clus_size; /* cluster size (in sectors) */
- int fat_len; /* length of FAT table (in sectors) */
- int num_clus; /* number of available clusters */
- unsigned char *fatbuf; /* the File Allocation Table */
- char *mcwd; /* the Current Working Directory */
-
- long size;
- long current;
- int stripmode = 0;
- int textmode = 0;
-
- main(argc, argv)
- int argc;
- char *argv[];
- {
- extern int optind;
- extern char *optarg;
- int fat, i, ismatch, entry, c, oops;
- char *filename, *newfile, text[4], tname[9], *getname(), *unixname();
- char *strncpy(), *pathname, *getpath();
- void exit(), readit(), free();
- struct directory *dir, *search();
-
- if (init(0)) {
- fprintf(stderr, "mtype: Cannot initialize diskette\n");
- exit(1);
- }
- /* get command line options */
- oops = 0;
- while ((c = getopt(argc, argv, "st")) != EOF) {
- switch(c) {
- case 's':
- stripmode = 1;
- break;
- case 't':
- textmode = 1;
- break;
- default:
- oops = 1;
- break;
- }
- }
-
- if (oops || (argc - optind) < 1) {
- fprintf(stderr, "Usage: mtype [-st] msdosfile [msdosfiles...]\n");
- exit(1);
- }
-
- for (i=optind; i<argc; i++) {
- filename = getname(argv[i]);
- pathname = getpath(argv[i]);
- if (subdir(pathname)) {
- free(filename);
- free(pathname);
- continue;
- }
- ismatch = 0;
- for (entry=0; entry<dir_entries; entry++) {
- dir = search(entry);
- /* if empty */
- if (dir->name[0] == 0x0)
- break;
- /* if erased */
- if (dir->name[0] == 0xe5)
- continue;
- /* if dir or volume label */
- if ((dir->attr & 0x10) || (dir->attr & 0x08))
- continue;
-
- strncpy(tname, (char *) dir->name, 8);
- strncpy(text, (char *) dir->ext, 3);
- tname[8] = '\0';
- text[3] = '\0';
-
- newfile = unixname(tname, text);
- /* see it if matches the pattern */
- if (match(newfile, filename)) {
- fat = dir->start[1]*0x100 + dir->start[0];
- size = dir->size[2]*0x10000L + dir->size[1]*0x100 + dir->size[0];
- readit(fat);
- ismatch = 1;
- }
- free(newfile);
- }
- if (!ismatch)
- fprintf(stderr, "mtype: File \"%s\" not found\n", filename);
- free(filename);
- free(pathname);
- }
- close(fd);
- exit(0);
- }
-
- /*
- * Decode the FAT chain given the begining FAT entry.
- */
-
- void
- readit(fat)
- int fat;
- {
- void getcluster();
-
- current = 0L;
- while (1) {
- getcluster(fat);
- /* get next cluster number */
- fat = getfat(fat);
- if (fat == -1) {
- fprintf(stderr, "mtype: FAT problem\n");
- exit(1);
- }
- /* end of cluster chain */
- if (fat >= 0xff8)
- break;
- }
- return;
- }
-
- /*
- * Read the named cluster, output to the stdout.
- */
-
- void
- getcluster(num)
- int num;
- {
- register int i;
- int buflen, start;
- unsigned char buf[CLSTRBUF];
- void exit(), perror(), move();
-
- start = (num - 2)*clus_size + dir_start + dir_len;
- move(start);
-
- buflen = clus_size * MSECSIZ;
- if (read(fd, (char *) buf, buflen) != buflen) {
- perror("getcluster: read");
- exit(1);
- }
- /* stop at size not EOF marker */
- for (i=0; i<buflen; i++) {
- current++;
- if (current > size)
- break;
- if (textmode && buf[i] == '\r')
- continue;
- if (textmode && current == size && buf[i] == 0x1a)
- continue;
- if (stripmode)
- putchar(buf[i] & 0x7f);
- else
- putchar(buf[i]);
- }
- return;
- }
-