From b93b018af83ea02d89d2aaecdc34d62be9dc0a39 Mon Sep 17 00:00:00 2001
From: Patrick McDermott <patrick.mcdermott@libiquity.com>
Date: Wed, 17 Mar 2021 06:25:36 -0400
Subject: db_locale_match(): New function

---
(limited to 'src')

diff --git a/src/locale.c b/src/locale.c
index d738084..f336484 100644
--- a/src/locale.c
+++ b/src/locale.c
@@ -18,10 +18,123 @@
  */
 
 #include <locale.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
 #include "locale.h"
+#include "output.h"
 
 const char *
 db_lc_messages_get(void)
 {
 	return setlocale(LC_MESSAGES, "");
 }
+
+int
+db_locale_match(char *loc)
+{
+	char *sys_start;
+	char *sys;
+	char *sys_end;
+	char *loc_end;
+	int   end;
+
+	sys_end = sys = sys_start = strdup(setlocale(LC_MESSAGES, ""));
+	loc_end = loc;
+
+	db_dbg("Matching locale \"%s\" against system locale \"%s\"", loc, sys);
+
+	end = 0;
+
+	/* Check language */
+	while (*sys_end != '\0' && *sys_end != '_' && *sys_end != '-') {
+		++sys_end;
+	}
+	while (*loc_end != '\0' && *loc_end != '_' && *loc_end != '-') {
+		++loc_end;
+	}
+	if (*sys_end == '\0' || *loc_end == '\0') {
+		end = 1;
+	}
+	*sys_end = '\0';
+	*loc_end = '\0';
+	if (strcasecmp(sys, loc) != 0) {
+		db_dbg("Language \"%s\" != \"%s\"", loc, sys);
+		free(sys_start);
+		return 0;
+	}
+	db_dbg("Language \"%s\" == \"%s\"", loc, sys);
+	if (end == 1) {
+		free(sys_start);
+		return 1;
+	}
+	sys = ++sys_end;
+	loc = ++loc_end;
+
+	/* Check territory */
+	while (*sys_end != '\0' && *sys_end != '.') {
+		++sys_end;
+	}
+	while (*loc_end != '\0' && *loc_end != '.') {
+		++loc_end;
+	}
+	if (*sys_end == '\0' || *loc_end == '\0') {
+		end = 1;
+	}
+	*sys_end = '\0';
+	*loc_end = '\0';
+	if (strcasecmp(sys, loc) != 0) {
+		db_dbg("Territory \"%s\" != \"%s\"", loc, sys);
+		free(sys_start);
+		return 1;
+	}
+	db_dbg("Territory \"%s\" == \"%s\"", loc, sys);
+	if (end == 1) {
+		free(sys_start);
+		return 2;
+	}
+	sys = ++sys_end;
+	loc = ++loc_end;
+
+	/* Check codeset */
+	while (*sys_end != '\0' && *sys_end != '@') {
+		++sys_end;
+	}
+	while (*loc_end != '\0' && *loc_end != '@') {
+		++loc_end;
+	}
+	if (*sys_end == '\0' || *loc_end == '\0') {
+		end = 1;
+	}
+	*sys_end = '\0';
+	*loc_end = '\0';
+	if (strcasecmp(sys, loc) != 0) {
+		db_dbg("Codeset \"%s\" != \"%s\"", loc, sys);
+		free(sys_start);
+		return 2;
+	}
+	db_dbg("Codeset \"%s\" == \"%s\"", loc, sys);
+	if (end == 1) {
+		free(sys_start);
+		return 3;
+	}
+	sys = ++sys_end;
+	loc = ++loc_end;
+
+	/* Check modifier */
+	while (*sys_end != '\0') {
+		++sys_end;
+	}
+	while (*loc_end != '\0') {
+		++loc_end;
+	}
+	if (strcasecmp(sys, loc) != 0) {
+		db_dbg("Modifier \"%s\" != \"%s\"", loc, sys);
+		free(sys_start);
+		return 3;
+	}
+	db_dbg("Modifier \"%s\" == \"%s\"", loc, sys);
+
+	free(sys_start);
+	return 4;
+}
diff --git a/src/locale.h b/src/locale.h
index 9fced63..7813370 100644
--- a/src/locale.h
+++ b/src/locale.h
@@ -21,5 +21,6 @@
 #define DB_LOCALE_H_
 
 const char *db_lc_messages_get(void);
+int db_locale_match(char *loc);
 
 #endif  /* DB_LOCALE_H_ */
--
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