osdep: add mp_get_user_langs

1 files changed, 61 insertions, 0 deletions

diff --git a/osdep/language-posix.c b/osdep/language-posix.c
new file mode 100644
index 0000000000..f5d1a3a72c
--- /dev/null
+++ b/osdep/language-posix.c
@@ -0,0 +1,61 @@
+/*
+ * User language lookup for generic POSIX platforms
+ *
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * mpv is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with mpv.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "misc/language.h"
+#include "mpv_talloc.h"
+
+#include <stddef.h>
+
+char **mp_get_user_langs(void)
+{
+    static const char *const list[] = {
+        "LC_ALL",
+        "LC_MESSAGES",
+        "LANG",
+        NULL
+    };
+
+    size_t nb = 0;
+    char **ret = NULL;
+
+    // Prefer anything we get from LANGUAGE first
+    for (const char *langList = getenv("LANGUAGE"); langList && *langList;) {
+        size_t len = strcspn(langList, ":");
+        MP_TARRAY_GROW(NULL, ret, nb);
+        ret[nb++] = talloc_strndup(ret, langList, len);
+        langList += len;
+        while (*langList == ':')
+            langList++;
+    }
+
+    // Then, the language components of other relevant locale env vars
+    for (int i = 0; list[i]; i++) {
+        const char *envval = getenv(list[i]);
+        if (envval && *envval) {
+            size_t len = strcspn(envval, ".@");
+            MP_TARRAY_GROW(NULL, ret, nb);
+            ret[nb++] = talloc_strndup(ret, envval, len);
+        }
+    }
+
+    // Null-terminate the list
+    MP_TARRAY_APPEND(NULL, ret, nb, NULL);
+
+    return ret;
+}