--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/smpp-send/msg_cmd.c	Sat Aug 05 12:24:31 2023 -0800
@@ -0,0 +1,69 @@
+/*
+ * This module implements msg and msg-udh input commands,
+ * after all settings have been captured.
+ */
+
+#include <sys/types.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include "error.h"
+
+extern int input_lineno;
+
+static int
+decode_hex_digit(c)
+{
+	if (c >= '0' && c <= '9')
+		return(c - '0');
+	if (c >= 'A' && c <= 'F')
+		return(c - 'A' + 10);
+	if (c >= 'a' && c <= 'f')
+		return(c - 'a' + 10);
+	return(-1);
+}
+
+static void
+cmd_msg_common(arg, udhi)
+	char *arg;
+{
+	u_char input[160];
+	unsigned input_len;
+
+	for (input_len = 0; ; input_len++) {
+		while (isspace(*arg))
+			arg++;
+		if (!*arg)
+			break;
+		if (!isxdigit(arg[0]) || !isxdigit(arg[1])) {
+			fprintf(stderr, ERR_PREFIX "invalid hex string\n",
+				input_lineno);
+			exit(1);
+		}
+		if (input_len >= 160) {
+			fprintf(stderr, ERR_PREFIX "hex string is too long\n",
+				input_lineno);
+			exit(1);
+		}
+		input[input_len] = (decode_hex_digit(arg[0]) << 4) |
+				    decode_hex_digit(arg[1]);
+		arg += 2;
+	}
+	build_submit_sm(input, input_len, udhi);
+}
+
+void
+cmd_msg_plain(argc, argv)
+	char **argv;
+{
+	cmd_msg_common(argv[1], 0);
+}
+
+void
+cmd_msg_udh(argc, argv)
+	char **argv;
+{
+	cmd_msg_common(argv[1], 1);
+}