From 05f6883a1ad7e135c4c0014a5dc586c4e25fc70c Mon Sep 17 00:00:00 2001
From: Serge Vakulenko <serge.vakulenko@gmail.com>
Date: Mon, 27 Aug 2018 16:42:50 -0700
Subject: [PATCH] Print utf8 text.

---
 md380.c |  5 ++---
 util.c  | 23 +++++++++++++++++++++++
 util.h  |  5 +++++
 uv380.c |  5 ++---
 4 files changed, 32 insertions(+), 6 deletions(-)

diff --git a/md380.c b/md380.c
index 8978485..a4df42f 100644
--- a/md380.c
+++ b/md380.c
@@ -312,12 +312,11 @@ static void print_unicode(FILE *out, const uint16_t *text, unsigned nchars, int
     unsigned i;
 
     for (i=0; i<nchars && *text; i++) {
-        //TODO: convert to utf8
-        putc(*text++, out);
+        putc_utf8(*text++, out);
     }
     if (fill_flag) {
         for (; i<nchars; i++) {
-            putc(' ', out);
+            putc_utf8(' ', out);
         }
     }
 }
diff --git a/util.c b/util.c
index bfb0cb9..9292217 100644
--- a/util.c
+++ b/util.c
@@ -185,3 +185,26 @@ void print_options(FILE *out, const char **tab, int num, const char *info)
     }
     fprintf(out, "\n");
 }
+
+//
+// Write Unicode symbol to file.
+// Convert to UTF-8 encoding:
+// 00000000.0xxxxxxx -> 0xxxxxxx
+// 00000xxx.xxyyyyyy -> 110xxxxx, 10yyyyyy
+// xxxxyyyy.yyzzzzzz -> 1110xxxx, 10yyyyyy, 10zzzzzz
+//
+void putc_utf8(unsigned short ch, FILE *out)
+{
+    if (ch < 0x80) {
+        putc (ch, out);
+
+    } else if (ch < 0x800) {
+        putc (ch >> 6 | 0xc0, out);
+        putc ((ch & 0x3f) | 0x80, out);
+
+    } else {
+        putc (ch >> 12 | 0xe0, out);
+        putc (((ch >> 6) & 0x3f) | 0x80, out);
+        putc ((ch & 0x3f) | 0x80, out);
+    }
+}
diff --git a/util.h b/util.h
index 89e625d..f23a9f1 100644
--- a/util.h
+++ b/util.h
@@ -119,3 +119,8 @@ void print_options(FILE *out, const char **tab, int num, const char *info);
 // Print list of all squelch tones.
 //
 void print_squelch_tones(FILE *out, int normal_only);
+
+//
+// Write Unicode symbol to a file in UTF-8 encoding.
+//
+void putc_utf8(unsigned short ch, FILE *out);
diff --git a/uv380.c b/uv380.c
index 8a1e5ae..1b5694d 100644
--- a/uv380.c
+++ b/uv380.c
@@ -328,8 +328,7 @@ static void print_unicode(FILE *out, const uint16_t *text, unsigned nchars, int
     unsigned i;
 
     for (i=0; i<nchars && *text; i++) {
-        //TODO: convert to utf8
-        putc(*text++, out);
+        putc_utf8(*text++, out);
     }
     if (fill_flag) {
         for (; i<nchars; i++) {
@@ -1144,7 +1143,7 @@ badtx:  fprintf(stderr, "Bad transmit frequency.\n");
     if (! is_valid_frequency(tx_mhz))
         goto badtx;
 
-    //TODO
+    //TODO: parse CTSS/DCS tone
     tmode = 0;
 
     if (strcasecmp("High", power_str) == 0) {