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- #include <stdio.h>
- #include <stdlib.h>
- #include <sys/stat.h>
-
- /* Unpacks blkfs into its source form.
- *
- * If numerical "upto" is specified, we stop unpacking when reaching this
- * blkno.
- */
- void usage()
- {
- fprintf(stderr, "Usage: blkunpack [upto] < blkfs > blk.fs\n");
- }
-
- int main(int argc, char *argv[])
- {
- char buf[1024];
- int blkid = 0;
- int upto = 0;
- if (argc > 2) {
- usage();
- return 1;
- }
- if (argc == 2) {
- upto = strtol(argv[1], NULL, 10);
- }
- while (fread(buf, 1024, 1, stdin) == 1) {
- int linecnt = 0 ;
- for (int i=1023; i>=0; i--) {
- if (buf[i]) {
- linecnt = (i / 64) + 1;
- break;
- }
- }
- if (linecnt) {
- // not an empty block
- printf("( ----- %03d )\n", blkid);
- for (int i=0; i<linecnt; i++) {
- char *line = &buf[i*64];
- // line length is *not* strlen()! it's the
- // position of the first non-null, starting
- // from the right. Then, we normalize nulls
- // to space.
- int j;
- for (j=63; j>=0; j--) {
- if (line[j] != '\0') {
- break;
- }
- }
- int len = j+1;
- if (len) {
- for (; j>=0; j--) {
- if (line[j] == '\0') {
- line[j] = ' ';
- }
- }
- fwrite(line, len, 1, stdout);
- }
- fputc('\n', stdout);
- }
- }
- blkid++;
- if (blkid == upto) {
- break;
- }
- }
- return 0;
- }
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