src/locale/catgets.c

   1 #define _BSD_SOURCE
   2 #include <nl_types.h>
   3 #include <endian.h>
   4 #include <stdlib.h>
   5 #include <stdint.h>
   6 #include <errno.h>
   7
   8 #define V(p) be32toh(*(uint32_t *)(p))
   9
  10 static int cmp(const void *a, const void *b)
  11 {
  12         uint32_t x = V(a), y = V(b);
  13         return x<y ? -1 : x>y ? 1 : 0;
  14 }
  15
  16 char *catgets (nl_catd catd, int set_id, int msg_id, const char *s)
  17 {
  18         const char *map = (const char *)catd;
  19         uint32_t nsets = V(map+4);
  20         const char *sets = map+20;
  21         const char *msgs = map+20+V(map+12);
  22         const char *strings = map+20+V(map+16);
  23         uint32_t set_id_be = htobe32(set_id);
  24         uint32_t msg_id_be = htobe32(msg_id);
  25         const char *set = bsearch(&set_id_be, sets, nsets, 12, cmp);
  26         if (!set) {
  27                 errno = ENOMSG;
  28                 return (char *)s;
  29         }
  30         uint32_t nmsgs = V(set+4);
  31         msgs += 12*V(set+8);
  32         const char *msg = bsearch(&msg_id_be, msgs, nmsgs, 12, cmp);
  33         if (!msg) {
  34                 errno = ENOMSG;
  35                 return (char *)s;
  36         }
  37         return (char *)(strings + V(msg+8));
  38 }