+static int parse_option_size(const char *name, const char *value, uint64_t *ret)
+{
+ char *postfix;
+ double sizef;
+
+ if (value != NULL) {
+ sizef = strtod(value, &postfix);
+ switch (*postfix) {
+ case 'T':
+ sizef *= 1024;
+ case 'G':
+ sizef *= 1024;
+ case 'M':
+ sizef *= 1024;
+ case 'K':
+ case 'k':
+ sizef *= 1024;
+ case 'b':
+ case '\0':
+ *ret = (uint64_t) sizef;
+ break;
+ default:
+ fprintf(stderr, "Option '%s' needs size as parameter\n", name);
+ fprintf(stderr, "You may use k, M, G or T suffixes for "
+ "kilobytes, megabytes, gigabytes and terabytes.\n");
+ return -1;
+ }
+ } else {
+ fprintf(stderr, "Option '%s' needs a parameter\n", name);
+ return -1;
+ }
+ return 0;
+}
+