+
+/*
+ * addlist
+ * Append an item to a comma separated list
+ */
+char *
+addlist (char *list, char *item)
+{
+ if (list)
+ list = add (", ", list);
+
+ return add (item, list);
+}
+
+/*
+ * folder_exists
+ * Check to see if a folder exists.
+ */
+int folder_exists(char *folder)
+{
+ struct stat st;
+ int exists = 0;
+
+ if (stat (folder, &st) == -1) {
+ /* The folder either doesn't exist, or we hit an error. Either way
+ * return a failure.
+ */
+ exists = 0;
+ } else {
+ /* We can see a folder with the right name */
+ exists = 1;
+ }
+
+ return exists;
+}
+
+
+/*
+ * 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;
+
+ /* Sanity check */
+ if (n < 0)
+ adios (NULL, "oops, num_digits called with negative value");
+
+ if (n == 0)
+ return 1;
+
+ while (n) {
+ n /= 10;
+ ndigits++;
+ }
+
+ return ndigits;
+}
+
+/*
+ * Append a message arg to an array of them, resizing it if necessary.
+ * Really a simple vector-of-(char *) maintenance routine.
+ */
+void
+app_msgarg(struct msgs_array *msgs, char *cp)
+{
+ if(msgs->size >= msgs->max) {
+ msgs->max += MAXMSGS;
+ msgs->msgs = mh_xrealloc(msgs->msgs,
+ msgs->max * sizeof(*msgs->msgs));
+ }
+ msgs->msgs[msgs->size++] = cp;
+}
+
+/* Open a form or components file */
+int
+open_form(char **form, char *def)
+{
+ int in;
+ if (*form) {
+ if ((in = open (etcpath (*form), O_RDONLY)) == NOTOK)
+ adios (*form, "unable to open form file");
+ } else {
+ if ((in = open (etcpath (def), O_RDONLY)) == NOTOK)
+ adios (def, "unable to open default components file");
+ *form = def;
+ }
+ return in;
+}