From 62bc1af6c6a1201db551e1ec523e757415464fd5 Mon Sep 17 00:00:00 2001
From: root <root@nolonger-other.tetra.james.local>
Date: Sun, 25 Oct 2020 13:26:29 +0000
Subject: tidy up, make less awful

---
 serial_rx.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 142 insertions(+)
 create mode 100644 serial_rx.c

(limited to 'serial_rx.c')

diff --git a/serial_rx.c b/serial_rx.c
new file mode 100644
index 0000000..d481417
--- /dev/null
+++ b/serial_rx.c
@@ -0,0 +1,142 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <termios.h>
+
+#include "util.h"
+#include "sia.h"
+
+
+
+
+
+void msg (char *account, char *event, char *ascii)
+{
+  printf ("%s %64s %s\n", account, event, ascii);
+}
+
+
+static int new_block (int fd, SIA_Block *b)
+{
+  static int have_ascii_messages = 0; /*SIA level 3 doesn't have ascii, SIA level 4 does */
+
+  static char account[SIA_MAX_DATA_LENGTH + 1];
+  static char event[SIA_MAX_DATA_LENGTH + 1];
+  static char ascii[SIA_MAX_DATA_LENGTH + 1];
+
+  unsigned len = sia_data_length (b);
+
+  if (sia_ack_if_needed (fd, b))
+    return -1;
+
+  switch (b->function) {
+  case SIA_FN_ACCOUNT_ID:
+    memcpy (account, b->data, len);
+    account[len] = 0;
+    break;
+
+  case SIA_FN_NEW_EVENT:
+  case SIA_FN_OLD_EVENT:
+    memcpy (event, b->data, len);
+    event[len] = 0;
+
+    if (!have_ascii_messages) msg (account, event, "");
+
+    break;
+
+  case SIA_FN_ASCII:
+    have_ascii_messages = 1;
+    memcpy (ascii, b->data, len);
+    ascii[len] = 0;
+
+    msg (account, event, ascii);
+    break;
+  }
+
+  return 0;
+}
+
+
+static int usage (const char *name)
+{
+  fprintf (stderr, "Usage:\n");
+  fprintf (stderr, "%s [ -b baud ] -p serial_device\n\n", name);
+  fprintf (stderr, "baud defaults to 9600\n");
+
+  return 1;
+}
+
+
+int main (int argc, char *argv[])
+{
+  const char *port;
+  int baud = 9600;
+  unsigned opt;
+  int fd;
+  SIA_Block b;
+  ssize_t red;
+
+  unsigned char buf[SIA_MAX_BLOCK_LENGTH];
+  unsigned ptr = 0;
+
+
+  while ((opt = getopt (argc, argv, "p:b:")) != -1) {
+    switch (opt) {
+    case 'p':
+      port = optarg;
+      break;
+
+    case 'b':
+      baud = atoi (optarg);
+      break;
+
+    default: /* '?' */
+      return usage (argv[0]);
+    }
+  }
+
+
+
+  if (!port)
+    return usage (argv[0]);
+
+  fd = open_tty (port, baud);
+
+  set_blocking (fd);
+
+  for (;;) {
+    red = read (fd, &buf[ptr], 1);
+
+    if ((red < 0) || (red > 1)) {
+      perror ("read");
+      return 1;
+    }
+
+    if (!red) continue;
+
+    ptr++;
+
+    switch (sia_parse (buf, ptr, &b)) {
+    case -1: /*Parse errror, flush and carry on */
+      tcflush (fd, TCIFLUSH);
+      ptr = 0;
+      break;
+
+    case 0: /*More data needed*/
+      break;
+
+    default: /*Valid block */
+      new_block (fd, &b);
+      ptr = 0;
+      break;
+    }
+
+    if (ptr == SIA_MAX_BLOCK_LENGTH) {
+      tcflush (fd, TCIFLUSH);
+      ptr = 0;
+    }
+
+  }
+
+}
-- 
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