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Usenet 1994 October
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usenetsourcesnewsgroupsinfomagicoctober1994disk2.iso
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unix
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volume11
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mtools
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part02
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mtype.c
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C/C++ Source or Header
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1987-08-27
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3KB
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153 lines
/*
* Display contents of a MSDOS file
*
* Emmet P. Gray US Army, HQ III Corps & Fort Hood
* ...!ihnp4!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;
stripmode = 0;
textmode = 0;
main(argc, argv)
int argc;
char *argv[];
{
extern int optind;
extern char *optarg;
int fat, i, ismatch, entry, subdir(), c, oops;
char *filename, *newfile, text[4], tname[9], *getname(), *unixname();
char *strncpy(), *pathname, *getpath();
void exit();
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 [-s|-t] <MSDOS file> [<MSDOS files...>]\n");
exit(1);
}
for (i=optind; i<argc; i++) {
filename = getname(argv[i]);
pathname = getpath(argv[i]);
if (subdir(pathname))
continue;
ismatch = 0;
for (entry=0; entry<dir_entries; entry++) {
dir = search(entry);
/* if empty */
if (dir->name[0] == NULL)
break;
/* if erased */
if (dir->name[0] == 0xe5)
continue;
/* if dir or volume lable */
if ((dir->attr & 0x10) || (dir->attr & 0x08))
continue;
strncpy(tname, dir->name, 8);
strncpy(text, dir->ext, 3);
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]*0x10000 + dir->size[1]*0x100 + dir->size[0];
readit(fat);
ismatch = 1;
}
}
if (!ismatch) {
fprintf(stderr, "mtype: File '%s' not found\n", filename);
continue;
}
}
close(fd);
exit(0);
}
readit(fat)
int fat;
{
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;
}
getcluster(num) /* read a cluster */
int num;
{
int i, buflen, start;
void exit(), perror();
char buf[1024];
start = (num - 2)*clus_size + dir_start + dir_len;
move(start);
buflen = clus_size * MSECSIZ;
if (read(fd, 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 (stripmode)
putchar(buf[i] & 0x7f);
else
putchar(buf[i]);
}
return;
}