+
+static void
+ship_message (const struct msg *m)
+{
+ enum { MAX_STACK = 4 };
+ static const struct msg *stack[MAX_STACK];
+ static size_t n;
+
+ /* If we're recursing on a given message, or recursing deeply, drop it. */
+ if (n >= MAX_STACK)
+ return;
+ for (size_t i = 0; i < n; i++)
+ if (stack[i] == m)
+ return;
+
+ stack[n++] = m;
+ if (msg_handler.output_msg && n <= 1)
+ msg_handler.output_msg (m, msg_handler.aux);
+ else
+ fprintf (stderr, "%s\n", m->text);
+ n--;
+}
+
+static void
+submit_note (char *s)
+{
+ struct msg m = {
+ .category = MSG_C_GENERAL,
+ .severity = MSG_S_NOTE,
+ .text = s,
+ };
+ ship_message (&m);
+
+ free (s);
+}
+
+static void
+process_msg (struct msg *m)
+{
+ int n_msgs, max_msgs;
+
+ if (too_many_errors
+ || (too_many_notes && m->severity == MSG_S_NOTE)
+ || (warnings_off && m->severity == MSG_S_WARNING))
+ return;
+
+ ship_message (m);
+
+ counts[m->severity]++;
+ max_msgs = settings_get_max_messages (m->severity);
+ n_msgs = counts[m->severity];
+ if (m->severity == MSG_S_WARNING)
+ n_msgs += counts[MSG_S_ERROR];
+ if (n_msgs > max_msgs)
+ {
+ if (m->severity == MSG_S_NOTE)
+ {
+ too_many_notes = true;
+ submit_note (xasprintf (_("Notes (%d) exceed limit (%d). "
+ "Suppressing further notes."),
+ n_msgs, max_msgs));
+ }
+ else
+ {
+ too_many_errors = true;
+ if (m->severity == MSG_S_WARNING)
+ submit_note (xasprintf (_("Warnings (%d) exceed limit (%d). Syntax processing will be halted."),
+ n_msgs, max_msgs));
+ else
+ submit_note (xasprintf (_("Errors (%d) exceed limit (%d). Syntax processing will be halted."),
+ n_msgs, max_msgs));
+ }
+ }
+}
+
+
+/* Emits M as an error message. Takes ownership of M. */
+void
+msg_emit (struct msg *m)
+{
+ if (!messages_disabled)
+ process_msg (m);
+ msg_destroy (m);
+}
+
+/* Disables message output until the next call to msg_enable. If
+ this function is called multiple times, msg_enable must be
+ called an equal number of times before messages are actually
+ re-enabled. */
+void
+msg_disable (void)
+{
+ messages_disabled++;
+}
+
+/* Enables message output that was disabled by msg_disable. */
+void
+msg_enable (void)
+{
+ assert (messages_disabled > 0);
+ messages_disabled--;
+}
+\f
+/* Private functions. */
+
+static char fatal_error_message[1024];
+static int fatal_error_message_bytes = 0;
+
+static char diagnostic_information[1024];
+static int diagnostic_information_bytes = 0;
+
+static int
+append_message (char *msg, int bytes_used, const char *fmt, ...)
+{
+ va_list va;
+ va_start (va, fmt);
+ int ret = vsnprintf (msg + bytes_used, 1024 - bytes_used, fmt, va);
+ va_end (va);
+ assert (ret >= 0);
+
+ return ret;
+}
+
+
+/* Generate a row of asterisks held in statically allocated memory */
+static struct substring
+generate_banner (void)
+{
+ static struct substring banner;
+ if (!banner.string)
+ banner = ss_cstr ("******************************************************\n");
+ return banner;
+}
+
+const char *
+prepare_fatal_error_message (void)
+{
+ fatal_error_message_bytes += append_message (fatal_error_message, fatal_error_message_bytes, generate_banner ().string);
+
+ fatal_error_message_bytes += append_message (fatal_error_message, fatal_error_message_bytes, "You have discovered a bug in PSPP. Please report this\n");
+ fatal_error_message_bytes += append_message (fatal_error_message, fatal_error_message_bytes, "to " PACKAGE_BUGREPORT ". Please include this entire\n");
+ fatal_error_message_bytes += append_message (fatal_error_message, fatal_error_message_bytes, "message, *plus* several lines of output just above it.\n");
+ fatal_error_message_bytes += append_message (fatal_error_message, fatal_error_message_bytes, "For the best chance at having the bug fixed, also\n");
+ fatal_error_message_bytes += append_message (fatal_error_message, fatal_error_message_bytes, "include the syntax file that triggered it and a sample\n");
+ fatal_error_message_bytes += append_message (fatal_error_message, fatal_error_message_bytes, "of any data file used for input.\n");
+ return fatal_error_message;
+}
+
+const char *
+prepare_diagnostic_information (void)
+{
+ diagnostic_information_bytes += append_message (diagnostic_information, diagnostic_information_bytes, "version: %s\n", version);
+ diagnostic_information_bytes += append_message (diagnostic_information, diagnostic_information_bytes, "host_system: %s\n", host_system);
+ diagnostic_information_bytes += append_message (diagnostic_information, diagnostic_information_bytes, "build_system: %s\n", build_system);
+ diagnostic_information_bytes += append_message (diagnostic_information, diagnostic_information_bytes, "locale_dir: %s\n", relocate (locale_dir));
+ diagnostic_information_bytes += append_message (diagnostic_information, diagnostic_information_bytes, "compiler version: %s\n",
+#ifdef __VERSION__
+ __VERSION__
+#else
+ "Unknown"
+#endif
+);
+
+ return diagnostic_information;
+}
+
+void
+request_bug_report (const char *msg)
+{
+ write (STDERR_FILENO, fatal_error_message, fatal_error_message_bytes);
+ write (STDERR_FILENO, "proximate cause: ", 21);
+ write (STDERR_FILENO, msg, strlen (msg));
+ write (STDERR_FILENO, "\n", 1);
+ write (STDERR_FILENO, diagnostic_information, diagnostic_information_bytes);
+ const struct substring banner = generate_banner ();
+ write (STDERR_FILENO, banner.string, banner.length);
+}