+
+struct term_userpass_state {
+ size_t curr_prompt;
+ int done_prompt; /* printed out prompt yet? */
+ size_t pos; /* cursor position */
+};
+
+/*
+ * Process some terminal data in the course of username/password
+ * input.
+ */
+int term_get_userpass_input(Terminal *term, prompts_t *p,
+ unsigned char *in, int inlen)
+{
+ struct term_userpass_state *s = (struct term_userpass_state *)p->data;
+ if (!s) {
+ /*
+ * First call. Set some stuff up.
+ */
+ p->data = s = snew(struct term_userpass_state);
+ s->curr_prompt = 0;
+ s->done_prompt = 0;
+ /* We only print the `name' caption if we have to... */
+ if (p->name_reqd && p->name) {
+ size_t l = strlen(p->name);
+ term_data_untrusted(term, p->name, l);
+ if (p->name[l-1] != '\n')
+ term_data_untrusted(term, "\n", 1);
+ }
+ /* ...but we always print any `instruction'. */
+ if (p->instruction) {
+ size_t l = strlen(p->instruction);
+ term_data_untrusted(term, p->instruction, l);
+ if (p->instruction[l-1] != '\n')
+ term_data_untrusted(term, "\n", 1);
+ }
+ /*
+ * Zero all the results, in case we abort half-way through.
+ */
+ {
+ int i;
+ for (i = 0; i < (int)p->n_prompts; i++)
+ memset(p->prompts[i]->result, 0, p->prompts[i]->result_len);
+ }
+ }
+
+ while (s->curr_prompt < p->n_prompts) {
+
+ prompt_t *pr = p->prompts[s->curr_prompt];
+ int finished_prompt = 0;
+
+ if (!s->done_prompt) {
+ term_data_untrusted(term, pr->prompt, strlen(pr->prompt));
+ s->done_prompt = 1;
+ s->pos = 0;
+ }
+
+ /* Breaking out here ensures that the prompt is printed even
+ * if we're now waiting for user data. */
+ if (!in || !inlen) break;
+
+ /* FIXME: should we be using local-line-editing code instead? */
+ while (!finished_prompt && inlen) {
+ char c = *in++;
+ inlen--;
+ switch (c) {
+ case 10:
+ case 13:
+ term_data(term, 0, "\r\n", 2);
+ pr->result[s->pos] = '\0';
+ pr->result[pr->result_len - 1] = '\0';
+ /* go to next prompt, if any */
+ s->curr_prompt++;
+ s->done_prompt = 0;
+ finished_prompt = 1; /* break out */
+ break;
+ case 8:
+ case 127:
+ if (s->pos > 0) {
+ if (pr->echo)
+ term_data(term, 0, "\b \b", 3);
+ s->pos--;
+ }
+ break;
+ case 21:
+ case 27:
+ while (s->pos > 0) {
+ if (pr->echo)
+ term_data(term, 0, "\b \b", 3);
+ s->pos--;
+ }
+ break;
+ case 3:
+ case 4:
+ /* Immediate abort. */
+ term_data(term, 0, "\r\n", 2);
+ sfree(s);
+ p->data = NULL;
+ return 0; /* user abort */
+ default:
+ /*
+ * This simplistic check for printability is disabled
+ * when we're doing password input, because some people
+ * have control characters in their passwords.
+ */
+ if ((!pr->echo ||
+ (c >= ' ' && c <= '~') ||
+ ((unsigned char) c >= 160))
+ && s->pos < pr->result_len - 1) {
+ pr->result[s->pos++] = c;
+ if (pr->echo)
+ term_data(term, 0, &c, 1);
+ }
+ break;
+ }
+ }
+
+ }
+
+ if (s->curr_prompt < p->n_prompts) {
+ return -1; /* more data required */
+ } else {
+ sfree(s);
+ p->data = NULL;
+ return +1; /* all done */
+ }
+}