test: add some integral type size sanity checks

With the recent problem on VMS of maxint_t being defined as a 32 bit integer
despite OpenSSL mandating 64 bit integers being available, it seems prudent
to add some sanity checks for out integral types.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/15830)

test/sanitytest.c

@@ -8,6 +8,7 @@
  */
 
 #include <string.h>
+#include <openssl/types.h>
 #include "testutil.h"
 #include "internal/numbers.h"
 
@@ -76,6 +77,38 @@ static int test_sanity_unsigned_conversion(void)
 
 static int test_sanity_range(void)
 {
+    /* Verify some types are the correct size */
+    if (!TEST_size_t_eq(sizeof(int8_t), 1)
+            || !TEST_size_t_eq(sizeof(uint8_t), 1)
+            || !TEST_size_t_eq(sizeof(int16_t), 2)
+            || !TEST_size_t_eq(sizeof(uint16_t), 2)
+            || !TEST_size_t_eq(sizeof(int32_t), 4)
+            || !TEST_size_t_eq(sizeof(uint32_t), 4)
+            || !TEST_size_t_eq(sizeof(int64_t), 8)
+            || !TEST_size_t_eq(sizeof(uint64_t), 8)
+#ifdef UINT128_MAX
+            || !TEST_size_t_eq(sizeof(int128_t), 16)
+            || !TEST_size_t_eq(sizeof(uint128_t), 16)
+#endif
+            || !TEST_size_t_eq(sizeof(char), 1)
+            || !TEST_size_t_eq(sizeof(unsigned char), 1))
+        return 0;
+
+    /* We want our long longs to be at least 64 bits */
+    if (!TEST_size_t_ge(sizeof(long long int), 8)
+            || !TEST_size_t_ge(sizeof(unsigned long long int), 8))
+        return 0;
+
+    /*
+     * Verify intmax_t.
+     * Some platforms defined intmax_t to be 64 bits but still support
+     * an int128_t, so this check is for at least 64 bits.
+     */
+    if (!TEST_size_t_ge(sizeof(ossl_intmax_t), 8)
+            || !TEST_size_t_ge(sizeof(ossl_uintmax_t), 8)
+            || !TEST_size_t_ge(sizeof(ossl_uintmax_t), sizeof(size_t)))
+        return 0;
+
     /* This isn't possible to check using the framework functions */
     if (SIZE_MAX < INT_MAX) {
         TEST_error("int must not be wider than size_t");
@@ -86,7 +119,7 @@ static int test_sanity_range(void)
 
 static int test_sanity_memcmp(void)
 {
-    return CRYPTO_memcmp("ab","cd",2);
+    return CRYPTO_memcmp("ab", "cd", 2);
 }
 
 int setup_tests(void)