string/tst-endian.c

   1 #include <byteswap.h>
   2 #include <endian.h>
   3 #include <inttypes.h>
   4 #include <stdio.h>
   5 #include <stdint.h>
   6 #include <libc-diag.h>
   7
   8 #if __GNUC_PREREQ (6, 0)
   9 /* GCC 6.0 warns on big endian systems about:
  10    htobeXX (beXXtoh (i)) != i
  11    warning: self-comparison always evaluates to false [-Wtautological-compare]
  12    because htobeXX(x) and beXXtoh(x) is defined to (x)
  13    in string/endian.h on big endian systems.
  14    The same applies to htoleXX/leXXtoh on little endian systems.  */
  15 # define DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE() \
  16   DIAG_IGNORE_NEEDS_COMMENT (6, "-Wtautological-compare")
  17 #else
  18 # define DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE()
  19 #endif
  20
  21 int
  22 do_test (void)
  23 {
  24   int result = 0;
  25
  26   for (uint64_t i = 0; i < (~UINT64_C (0)) >> 2; i = (i << 1) + 3)
  27     {
  28       if (i < UINT64_C (65536))
  29         {
  30           DIAG_PUSH_NEEDS_COMMENT;
  31           DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE ();
  32           if (htobe16 (be16toh (i)) != i)
  33             {
  34               printf ("htobe16 (be16toh (%" PRIx64 ")) == %" PRIx16 "\n",
  35                       i, (uint16_t) htobe16 (be16toh (i)));
  36               result = 1;
  37             }
  38           if (htole16 (le16toh (i)) != i)
  39             {
  40               printf ("htole16 (le16toh (%" PRIx64 ")) == %" PRIx16 "\n",
  41                       i, (uint16_t) htole16 (le16toh (i)));
  42               result = 1;
  43             }
  44           DIAG_POP_NEEDS_COMMENT;
  45
  46           uint16_t n[2];
  47           n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_16 (i);
  48           n[__BYTE_ORDER == __BIG_ENDIAN] = i;
  49           if (htole16 (i) != n[0])
  50             {
  51               printf ("htole16 (%" PRIx64 ") == %" PRIx16 " != %" PRIx16 "\n",
  52                       i, (uint16_t) htole16 (i), n[0]);
  53               result = 1;
  54             }
  55           if (htobe16 (i) != n[1])
  56             {
  57               printf ("htobe16 (%" PRIx64 ") == %" PRIx16 " != %" PRIx16 "\n",
  58                       i, (uint16_t) htobe16 (i), n[1]);
  59               result = 1;
  60             }
  61         }
  62
  63       if (i < UINT64_C (4294967296))
  64         {
  65           DIAG_PUSH_NEEDS_COMMENT;
  66           DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE ();
  67           if (htobe32 (be32toh (i)) != i)
  68             {
  69               printf ("htobe32 (be32toh (%" PRIx64 ")) == %" PRIx32 "\n",
  70                       i, (uint32_t) htobe32 (be32toh (i)));
  71               result = 1;
  72             }
  73           if (htole32 (le32toh (i)) != i)
  74             {
  75               printf ("htole32 (le32toh (%" PRIx64 ")) == %" PRIx32 "\n",
  76                       i, (uint32_t) htole32 (le32toh (i)));
  77               result = 1;
  78             }
  79           DIAG_POP_NEEDS_COMMENT;
  80
  81           uint32_t n[2];
  82           n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_32 (i);
  83           n[__BYTE_ORDER == __BIG_ENDIAN] = i;
  84           if (htole32 (i) != n[0])
  85             {
  86               printf ("htole32 (%" PRIx64 ") == %" PRIx32 " != %" PRIx32 "\n",
  87                       i, (uint32_t) htole32 (i), n[0]);
  88               result = 1;
  89             }
  90           if (htobe32 (i) != n[1])
  91             {
  92               printf ("htobe32 (%" PRIx64 ") == %" PRIx32 " != %" PRIx32 "\n",
  93                       i, (uint32_t) htobe32 (i), n[1]);
  94               result = 1;
  95             }
  96         }
  97
  98       DIAG_PUSH_NEEDS_COMMENT;
  99       DIAG_IGNORE_NEEDS_COMMENT_TAUTOLOGICAL_COMPARE ();
 100       if (htobe64 (be64toh (i)) != i)
 101         {
 102           printf ("htobe64 (be64toh (%" PRIx64 ")) == %" PRIx64 "\n",
 103                   i, htobe64 (be64toh (i)));
 104           result = 1;
 105         }
 106       if (htole64 (le64toh (i)) != i)
 107         {
 108           printf ("htole64 (le64toh (%" PRIx64 ")) == %" PRIx64 "\n",
 109                   i, htole64 (le64toh (i)));
 110           result = 1;
 111         }
 112       DIAG_POP_NEEDS_COMMENT;
 113
 114       uint64_t n[2];
 115       n[__BYTE_ORDER == __LITTLE_ENDIAN] = bswap_64 (i);
 116       n[__BYTE_ORDER == __BIG_ENDIAN] = i;
 117       if (htole64 (i) != n[0])
 118         {
 119           printf ("htole64 (%" PRIx64 ") == %" PRIx64 " != %" PRIx64 "\n",
 120                   i, htole64 (i), n[0]);
 121           result = 1;
 122         }
 123       if (htobe64 (i) != n[1])
 124         {
 125           printf ("htobe64 (%" PRIx64 ") == %" PRIx64 " != %" PRIx64 "\n",
 126                   i, htobe64 (i), n[1]);
 127           result = 1;
 128         }
 129     }
 130
 131   return result;
 132 }
 133
 134 #include <support/test-driver.c>