int
cmd_dd_exec(CLI *cli, char *argv[]) {
int verbose = 0, seek = 0, skip = 0, count = -1, block = 32;
int size, rc, err = 0, argc = cli_num_args(argv);
char infile[PATH_MAX], outfile[PATH_MAX];
char *inname = NULL, *outname = NULL;
FL_FILE *in = NULL, *out = NULL;
int c, opt_ind;
//char *buffer = NULL;
for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
c = getopt_long(argc, argv, "vi:o:b:c:s:k:", long_options, &opt_ind);
switch (c) {
case 'v': verbose = 1; break;
case 'i': inname = optarg; break;
case 'o': outname = optarg; break;
case 'b': block = atoi(optarg); break;
case 's': skip = atoi(optarg); break;
case 'c': count = atoi(optarg); break;
case 'k': seek = atoi(optarg); break;
}
}
if (verbose) {
printf("inname = %s\n", inname);
printf("outname = %s\n", outname);
printf("block = %i\n", block);
printf("skip = %i\n", skip);
printf("seek = %i\n", seek);
printf("count = %i\n", count);
}
//buff = (char *)mall c(block);
char buffer[block];
if (argc - optind != 1) {
printf("dd - incorrect number of arguments. Try 'man dd'\n");
err++; goto cleanup;
}
if (buffer == NULL) {
printf("dd: out of memory.\n");
err++; goto cleanup;
}
if (inname) {
cli_clean_path(cli, inname, infile);
if (fl_is_dir(infile)) {
printf("dd: '%s' is a directory\n", infile);
err++; goto cleanup;
}
in = (FL_FILE *)fl_fopen(infile, "r");
if (!in) {
printf("dd: could not open '%s' for reading\n", infile);
err++; goto cleanup;
}
fl_fseek(in, skip * block, SEEK_SET);
} else {
printf("dd: no input file specified - dumping zeros\n");
memset(buffer, 0, block);
}
if (outname) {
cli_clean_path(cli, outname, outfile);
if (fl_is_dir(outfile)) {
printf("dd: '%s' is a directory\n", outfile);
err++; goto cleanup;
}
out = (FL_FILE *)fl_fopen(outfile, "r+");
if (out) {
rc = fl_fseek(out, seek * block, SEEK_SET);
printf("WARNING: seeking in outfile beyond EOF is unsupported!\n");
} else {
out = (FL_FILE *)fl_fopen(outfile, "w");
}
if (!out) {
printf("dd: could not open '%s' for writeing\n", outfile);
err++; goto cleanup;
}
} else {
printf("dd: no output file specified - using stdout\n");
}
if (count >= 0) {
size = count;
} else {
// TODO size of (infile - skip) / block
}
while (size > 0) {
int blk = count - size;
if (verbose) printf("dd: reading block %i\n", blk);
if (in) {
rc = fl_fread(buffer, block, 1, in);
if (rc < 0) {
printf("dd: Error reading block %i\n", blk);
err++; goto cleanup;
} else {
// short read -> set block size to number of bytes read
block = rc;
}
}
if (verbose) printf("dd: writeing block %i\n", blk);
if (out) {
rc = fl_fwrite(buffer, block, 1, out);
if (rc < 0) {
printf("dd: Error writeing block %i\n", blk);
err++; goto cleanup;
}
} else {
printf("%s\n", buffer);
}
size--;
}
// TODO print summary
cleanup:
fl_fclose(in);
fl_fclose(out);
//free(buffer);
return (err ? -1 : 0);
}
int32_t file_seek(file_handle_t handle, int32_t offset, int32_t origin)
{
return fl_fseek(handle, offset, origin);
}
