1 files changed, 25 insertions, 1 deletions
diff --git a/clients/bokfweb.c b/clients/bokfweb.c
index d04e2d6..cc19826 100644
--- a/clients/bokfweb.c
+++ b/clients/bokfweb.c
@@ -15,6 +15,7 @@
    directly: only Caddy and the wrapper in the same container talk to it. */
 #include <arpa/inet.h>
 #include <errno.h>
+#include <locale.h>
 #include <netinet/in.h>
 #include <signal.h>
 #include <stdio.h>
@@ -23,6 +24,7 @@
 #include <sys/socket.h>
 #include <sys/time.h>
 #include <unistd.h>
+#include <wchar.h>
 
 #include "client.h"
 #include "log.h"
@@ -446,8 +448,30 @@ static void serve(int cfd, struct gate *g)
     memset(buf, 0, n); /* the body may hold a password */
 }
 
-int main(void)
+/* `bokfweb --check-locale`, run while the web image is built: bokftui in
+   the same image needs a UTF-8 locale for åäö, and a statically linked
+   glibc finds none unless its locale data is installed. Exits 1 without. */
+static int check_locale(void)
 {
+    const char *l = setlocale(LC_ALL, "");
+    wchar_t w = 0;
+    mbstate_t st;
+    memset(&st, 0, sizeof st);
+    size_t n = mbrtowc(&w, "\xc3\xa5", 2, &st); /* å */
+    if (!l || n != 2 || w != 0xE5) {
+        fprintf(stderr, "bokfweb: no UTF-8 locale (setlocale: %s); bokftui "
+                        "would show no åäö\n",
+                l ? l : "failed");
+        return 1;
+    }
+    printf("locale ok: %s\n", l);
+    return 0;
+}
+
+int main(int argc, char **argv)
+{
+    if (argc > 1 && strcmp(argv[1], "--check-locale") == 0)
+        return check_locale();
     signal(SIGPIPE, SIG_IGN);
     const char *lvl = getenv("BOKFWEB_LOG_LEVEL");
     log_set_level(lvl ? log_level_from_name(lvl) : LOG_INFO);