From 69efcf51adbe0382c11d83d04e14279fe010d2b2 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Wed, 14 Feb 2018 18:41:03 +0100
Subject: utf8: add utf8_n_codepoints() for counting complete utf8 codepoints
 in a string

---
 src/basic/utf8.c | 19 +++++++++++++++++++
 src/basic/utf8.h |  2 ++
 2 files changed, 21 insertions(+)

diff --git a/src/basic/utf8.c b/src/basic/utf8.c
index 4da9a405c..b17f42026 100644
--- a/src/basic/utf8.c
+++ b/src/basic/utf8.c
@@ -408,3 +408,22 @@ int utf8_encoded_valid_unichar(const char *str) {
 
         return len;
 }
+
+size_t utf8_n_codepoints(const char *str) {
+        size_t n = 0;
+
+        /* Returns the number of UTF-8 codepoints in this string, or (size_t) -1 if the string is not valid UTF-8. */
+
+        while (*str != 0) {
+                int k;
+
+                k = utf8_encoded_valid_unichar(str);
+                if (k < 0)
+                        return (size_t) -1;
+
+                str += k;
+                n++;
+        }
+
+        return n;
+}
diff --git a/src/basic/utf8.h b/src/basic/utf8.h
index b0a7485ae..712861518 100644
--- a/src/basic/utf8.h
+++ b/src/basic/utf8.h
@@ -59,3 +59,5 @@ static inline bool utf16_is_trailing_surrogate(char16_t c) {
 static inline char32_t utf16_surrogate_pair_to_unichar(char16_t lead, char16_t trail) {
                 return ((lead - 0xd800) << 10) + (trail - 0xdc00) + 0x10000;
 }
+
+size_t utf8_n_codepoints(const char *str);
-- 
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