1 files changed, 33 insertions, 1 deletions
diff --git a/src/locale/catgets.c b/src/locale/catgets.c
index bbee8986..d4a44b35 100644
--- a/src/locale/catgets.c
+++ b/src/locale/catgets.c
@@ -1,6 +1,38 @@
+#define _BSD_SOURCE
 #include <nl_types.h>
+#include <endian.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <errno.h>
+
+#define V(p) be32toh(*(uint32_t *)(p))
+
+int cmp(const void *a, const void *b)
+{
+	uint32_t x = V(a), y = V(b);
+	return x<y ? -1 : x>y ? 1 : 0;
+}
 
 char *catgets (nl_catd catd, int set_id, int msg_id, const char *s)
 {
-	return (char *)s;
+	const char *map = (const char *)catd;
+	uint32_t nsets = V(map+4);
+	const char *sets = map+20;
+	const char *msgs = map+20+V(map+12);
+	const char *strings = map+20+V(map+16);
+	uint32_t set_id_be = htobe32(set_id);
+	uint32_t msg_id_be = htobe32(msg_id);
+	const char *set = bsearch(&set_id_be, sets, nsets, 12, cmp);
+	if (!set) {
+		errno = ENOMSG;
+		return (char *)s;
+	}
+	uint32_t nmsgs = V(set+4);
+	msgs += 12*V(set+8);
+	const char *msg = bsearch(&msg_id_be, msgs, nmsgs, 12, cmp);
+	if (!msg) {
+		errno = ENOMSG;
+		return (char *)s;
+	}
+	return (char *)(strings + V(msg+8));
 }