From 24105f6e9759b74c04522de1de12ddb77cfba568 Mon Sep 17 00:00:00 2001
From: postscriptum
Date: Thu, 22 May 2025 03:34:48 +0300
Subject: use utf-8 lowercase function for tags #396

---
 activitypub.c | 2 +-
 data.c        | 4 ++--
 format.c      | 3 ++-
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/activitypub.c b/activitypub.c
index a7e133a..3ff51ad 100644
--- a/activitypub.c
+++ b/activitypub.c
@@ -903,7 +903,7 @@ xs_str *process_tags(snac *snac, const char *content, xs_list **tag)
             if (*v == '#') {
                 /* hashtag */
                 xs *d = xs_dict_new();
-                xs *n = xs_tolower_i(xs_dup(v));
+                xs *n = xs_utf8_to_lower(xs_dup(v));
                 xs *h = xs_fmt("%s?t=%s", srv_baseurl, n + 1);
                 xs *l = xs_fmt("<a href=\"%s\" class=\"mention hashtag\" rel=\"tag\">%s</a>", h, v);
 
diff --git a/data.c b/data.c
index e3fa52d..d5dc171 100644
--- a/data.c
+++ b/data.c
@@ -2200,7 +2200,7 @@ void tag_index(const char *id, const xs_dict *obj)
                 if (*name == '\0')
                     continue;
 
-                name = xs_tolower_i((xs_str *)name);
+                name = xs_utf8_to_lower((xs_str *)name);
 
                 xs *md5_tag   = xs_md5_hex(name, strlen(name));
                 xs *tag_dir   = xs_fmt("%s/%c%c", g_tag_dir, md5_tag[0], md5_tag[1]);
@@ -2230,7 +2230,7 @@ xs_str *tag_fn(const char *tag)
     if (*tag == '#')
         tag++;
 
-    xs *lw_tag = xs_tolower_i(xs_dup(tag));
+    xs *lw_tag = xs_utf8_to_lower(xs_dup(tag));
     xs *md5    = xs_md5_hex(lw_tag, strlen(lw_tag));
 
     return xs_fmt("%s/tag/%c%c/%s.idx", srv_basedir, md5[0], md5[1], md5);
diff --git a/format.c b/format.c
index 2f30a0d..0f844cd 100644
--- a/format.c
+++ b/format.c
@@ -8,6 +8,7 @@
 #include "xs_json.h"
 #include "xs_time.h"
 #include "xs_match.h"
+#include "xs_unicode.h"
 
 #include "snac.h"
 
@@ -443,7 +444,7 @@ xs_str *sanitize(const char *content)
         if (n & 0x1) {
             xs *s1  = xs_strip_i(xs_crop_i(xs_dup(v), v[1] == '/' ? 2 : 1, -1));
             xs *l1  = xs_split_n(s1, " ", 1);
-            xs *tag = xs_tolower_i(xs_dup(xs_list_get(l1, 0)));
+            xs *tag = xs_utf8_to_lower(xs_dup(xs_list_get(l1, 0)));
             xs *s2  = NULL;
             int i;
 
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