implement mo file string lookup for translations

the core is based on a binary search; hash table is not used. both
native and reverse-endian mo files are supported. all offsets read
from the mapped mo file are checked against the mapping size to
prevent the possibility of reads outside the mapping.

this commit has no observable effects since there are not yet any
callers to the message translation code.

1 files changed, 20 insertions, 0 deletions

diff --git a/src/locale/__lctrans.c b/src/locale/__lctrans.c
new file mode 100644
index 00000000..2769c084
--- /dev/null
+++ b/src/locale/__lctrans.c
@@ -0,0 +1,20 @@
+#include <locale.h>
+#include "locale_impl.h"
+#include "libc.h"
+
+const char *dummy(const char *msg, const struct __locale_map *lm)
+{
+	return msg;
+}
+
+weak_alias(dummy, __lctrans_impl);
+
+const char *__lctrans(const char *msg, const struct __locale_map *lm)
+{
+	return __lctrans_impl(msg, lm);
+}
+
+const char *__lctrans_cur(const char *msg)
+{
+	return __lctrans_impl(msg, CURRENT_LOCALE->cat[LC_MESSAGES-2]);
+}