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