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95ab1ad588
Working in "blk/" folder from a modern system is harder than it should be. Moving blocks around is a bit awkward, grepping is a bit less convenient than it could be, git blame has troubles following, etc. In this commit, we modify blkpack and blkunpack to work with single text files with blocks being separated by a special markup. I think this will make the code significantly more convenient to work into.
98 lines
2.3 KiB
C
98 lines
2.3 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/stat.h>
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static int lineno;
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static void emptylines(int n)
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{
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for (int i=0; i<64*n; i++) putchar(0);
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}
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static int getmarker(char *line) // returns -1 on error, blkid otherwise
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{
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int blkid;
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int r = sscanf(line, "( ----- %d )\n", &blkid);
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if (r == 1) {
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return blkid;
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} else {
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return -1;
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}
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}
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static int expectmarker(char *line)
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{
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int blkid = getmarker(line);
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if (blkid < 0) { // could not scan
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fprintf(
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stderr, "Error at line %d: expecting block marker\n", lineno);
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}
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return blkid;
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}
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static void usage()
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{
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fprintf(stderr, "Usage: blkpack < blk.fs > blkfs\n");
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}
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int main(int argc, char *argv[])
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{
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int prevblkid = -1;
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int blkid;
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char *line = NULL;
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if (argc != 1) {
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usage();
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return 1;
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}
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lineno = 1;
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size_t n = 0;
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ssize_t cnt = getline(&line, &n, stdin);
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if (cnt <= 0) {
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fprintf(stderr, "No input\n");
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return 1;
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}
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while (1) {
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blkid = expectmarker(line);
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if (blkid < 0) return 1;
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if (blkid <= prevblkid) {
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fprintf(
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stderr,
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"Wrong blkid (%d) at line %d: blocks must be ordered\n",
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blkid, lineno);
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return 1;
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}
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emptylines((blkid-prevblkid-1)*16);
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int blkline;
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for (blkline=0; blkline<16; blkline++) {
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lineno++;
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cnt = getline(&line, &n, stdin);
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if (cnt <= 0) break; // EOF
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if (cnt > 65) {
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fprintf(stderr, "Line %d too long (blk %d)\n", lineno, blkid);
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return 1;
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}
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if (getmarker(line) >= 0) break; // we have a marker early
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line[cnt-1] = '\0'; // remove newline
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printf("%s", line);
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// pad line to 64 chars
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for (int i=cnt-1; i<64; i++) putchar(0);
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}
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if (blkline == 16) {
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lineno++;
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cnt = getline(&line, &n, stdin);
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} else {
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// fill to 16 lines
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emptylines(16-blkline);
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}
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if (cnt <= 0) break; // EOF
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prevblkid = blkid;
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}
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free(line);
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return 0;
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}
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