+void
+display_builtin_command (const char *cmd)
+{
+ /* help for actions is auto-generated, see display_command */
+
+ if (strcasecmp (cmd, "alloc") == 0)
+ printf ("alloc - allocate an image\n"
+ " alloc <filename> <size>\n"
+ "\n"
+ " This creates an empty (zeroed) file of the given size,\n"
+ " and then adds so it can be further examined.\n"
+ "\n"
+ " For more advanced image creation, see qemu-img utility.\n"
+ "\n"
+ " Size can be specified (where <nn> means a number):\n"
+ " <nn> number of kilobytes\n"
+ " eg: 1440 standard 3.5\" floppy\n"
+ " <nn>K or <nn>KB number of kilobytes\n"
+ " <nn>M or <nn>MB number of megabytes\n"
+ " <nn>G or <nn>GB number of gigabytes\n"
+ " <nn>sects number of 512 byte sectors\n");
+ else if (strcasecmp (cmd, "help") == 0)
+ printf ("help - display a list of commands or help on a command\n"
+ " help cmd\n"
+ " help\n");
+ else if (strcasecmp (cmd, "quit") == 0)
+ printf ("quit - quit guestfish\n"
+ " quit\n");
+ else
+ fprintf (stderr, "%s: command not known, use -h to list all commands\n",
+ cmd);
+}
+
+/* Parse size parameter of alloc command. */
+static int
+parse_size (const char *str, off_t *size_rtn)
+{
+ uint64_t size;
+ char type;
+
+ /* Note that the parsing here is looser than what is specified in the
+ * help, but we may tighten it up in future so beware.
+ */
+ if (sscanf (str, "%"SCNu64"%c", &size, &type) == 2) {
+ switch (type) {
+ case 'k': case 'K': size *= 1024; break;
+ case 'm': case 'M': size *= 1024 * 1024; break;
+ case 'g': case 'G': size *= 1024 * 1024 * 1024; break;
+ case 's': size *= 512; break;
+ default:
+ fprintf (stderr, "could not parse size specification '%s'\n", str);
+ return -1;
+ }
+ }
+ else if (sscanf (str, "%"SCNu64, &size) == 1)
+ size *= 1024;
+ else {
+ fprintf (stderr, "could not parse size specification '%s'\n", str);
+ return -1;
+ }
+
+ /* XXX 32 bit file offsets, if anyone uses them? GCC should give
+ * a warning here anyhow.
+ */
+ *size_rtn = size;
+
+ return 0;
+}
+
+void
+free_strings (char **argv)
+{
+ int argc;
+
+ for (argc = 0; argv[argc] != NULL; ++argc)
+ free (argv[argc]);
+ free (argv);
+}
+
+void
+print_strings (char * const * const argv)
+{
+ int argc;
+
+ for (argc = 0; argv[argc] != NULL; ++argc)
+ printf ("%s\n", argv[argc]);
+}
+
+int
+is_true (const char *str)
+{
+ return
+ strcasecmp (str, "0") != 0 &&
+ strcasecmp (str, "f") != 0 &&
+ strcasecmp (str, "false") != 0 &&
+ strcasecmp (str, "n") != 0 &&
+ strcasecmp (str, "no") != 0;
+}
+
+/* This is quite inadequate for real use. For example, there is no way
+ * to specify an empty list. We need to use a real parser to allow
+ * quoting, empty lists, etc.
+ */
+char **
+parse_string_list (const char *str)
+{
+ char **argv;
+ const char *p, *pend;
+ int argc, i;
+
+ argc = 1;
+ for (i = 0; str[i]; ++i)
+ if (str[i] == ':') argc++;
+
+ argv = malloc (sizeof (char *) * (argc+1));
+ if (argv == NULL) { perror ("malloc"); exit (1); }
+
+ p = str;
+ i = 0;
+ while (*p) {
+ pend = strchrnul (p, ':');
+ argv[i] = strndup (p, pend-p);
+ i++;
+ p = *pend == ':' ? pend+1 : pend;
+ }
+ argv[i] = NULL;