}
argc -= optind;
argv += optind;
+ /* expect PATH [SIZE] */
if(argc > 2)
fatal(0, "excess arguments");
+ /* If --both but no SIZE, assume a block device, which is to be filled */
if(argc == 1 && mode == BOTH)
entireopt = true;
if(entireopt) {
if(argc != 1)
fatal(0, "with --entire, size should not be specified");
} else {
+ /* --create without --entire requires PATH SIZE
+ * --verify just requires PATH, SIZE is optional */
if(argc < (mode == VERIFY ? 1 : 2))
fatal(0, "insufficient arguments");
}
if(seed && seedpath)
fatal(0, "both --seed and --seed-file specified");
if(mode == BOTH && !seed && !seedpath) {
+ /* --both and no seed specified; pick a random one */
#ifdef HAVE_RANDOM_DEVICE
seedpath = RANDOM_DEVICE;
#else
fclose(seedfile);
}
if (!seed) {
+ /* No seed specified, use a constant */
seed = (void*)default_seed;
seedlen = sizeof(default_seed)-1;
}
path = argv[0];
if(argc > 1) {
+ /* Explicit size specified */
errno = 0;
char *end;
size = strtoll(argv[1], &end, 10);
else if(*end)
fatal(0, "invalid size");
} else if(entireopt) {
+ /* Use stupidly large size as a proxy for 'infinite' */
size = LLONG_MAX;
} else {
+ /* Retrieve size from target (which must exist) */
struct stat sb;
if(stat(path, &sb) < 0)
fatal(errno, "stat %s", path);
return 0;
}
+// flush stdout, fatal on error
static void flushstdout() {
if(ferror(stdout) || fflush(stdout))
fatal(errno, "flush stdout");
}
+// clear the progress indicator
static void clearprogress() {
if (!progress) return;
printf(" %-10s %*s \r", "", (int)sizeof(long long)*4, "");
flushstdout();
}
+// update progress indicator
static void showprogress(long long amount, const char *show) {
if (!progress) return;
flushstdout();
}
+// write/verify the target file
static long long execute(mode_type mode, bool entire, const char *show) {
Arcfour rng((const char*)seed, seedlen);
FILE *fp = fopen(path, mode == VERIFY ? "rb" : "wb");
path, size - remain + n, size,
(unsigned char)generated[n], (unsigned char)input[n]);
}
+ /* Truncated */
if(bytesRead < bytesGenerated) {
if(entire) {
assert(feof(fp));
}
if(fclose(fp) < 0)
fatal(errno, "%s", path);
+ /* Actual size written/verified */
long long done = size - remain;
if(show) {
printf("%lld bytes (%lldM, %lldG) %s\n",