text: #define _BSD_SOURCE
  #include <nl_types.h>
  #include <endian.h>
  #include <stdlib.h>
  #include <stdint.h>
  #include <errno.h>
  
  #ifndef __EMSCRIPTEN__
  #define V(p) be32toh(*(uint32_t *)(p))
  
  static int cmp(const void *a, const void *b)
  {
  	uint32_t x = V(a), y = V(b);
  	return x<y ? -1 : x>y ? 1 : 0;
  }
  #endif
  
  char *catgets (nl_catd catd, int set_id, int msg_id, const char *s)
  {
  #ifdef __EMSCRIPTEN__
  	return (char *)s;
  #else
  	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));
  #endif
  }
  