+ /* Copy s1 and free it */
+ if (s1) {
+ memcpy(cp, s1, len1);
+ free(s1);
+ }
+
+ /* Copy s2 */
+ if (s2)
+ memcpy(cp + len1, s2, len2);
+
+ /* Now NULL terminate the string */
+ cp[len1 + len2] = '\0';
+
+ return cp;
+}
+
+
+/*
+** create_folder
+** Check to see if a folder exists, if not, prompt the user to create it.
+*/
+void
+create_folder(char *folder, int autocreate, void (*done_callback)(int))
+{
+ struct stat st;
+ extern int errno;
+ char *cp;
+
+ if (stat(folder, &st) == -1) {
+ if (errno != ENOENT)
+ adios(folder, "error on folder");
+ if (autocreate == 0) {
+ /* ask before creating folder */
+ cp = concat("Create folder \"", folder, "\"? ", NULL);
+ if (!getanswer(cp))
+ done_callback(1);
+ free(cp);
+ } else if (autocreate == -1) {
+ /* do not create, so exit */
+ done_callback(1);
+ }
+ if (!makedir(folder))
+ adios(NULL, "unable to create folder %s", folder);
+ }
+}
+
+/*
+** num_digits
+** Return the number of digits in a nonnegative integer.
+*/
+int
+num_digits(int n)
+{
+ int ndigits = 0;