Support larger integer test arguments: C part

Change the type of signed integer arguments from int32_t to intmax_t.
This allows the C code to work with test function arguments with a range
larger than int32_t. A subsequent commit will change the .datax generator
to support larger types.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/tests/suites/host_test.function b/tests/suites/host_test.function
index 59b18d2..06f391f 100644
--- a/tests/suites/host_test.function
+++ b/tests/suites/host_test.function
@@ -32,21 +32,19 @@
  *
  * \return      0 if success else 1
  */
-int verify_int(char *str, int32_t *p_value)
+int verify_int(char *str, intmax_t *p_value)
 {
     char *end = NULL;
     errno = 0;
+    /* Limit the range to long: for large integers, the test framework will
+     * use expressions anyway. */
     long value = strtol(str, &end, 0);
     if (errno == EINVAL || *end != '\0') {
         mbedtls_fprintf(stderr,
                         "Expected integer for parameter and got: %s\n", str);
         return KEY_VALUE_MAPPING_NOT_FOUND;
     }
-    if (errno == ERANGE
-#if LONG_MAX > 0x7fffffff
-        || value > 0x7fffffffL || value < -0x80000000L
-#endif
-        ) {
+    if (errno == ERANGE) {
         mbedtls_fprintf(stderr, "Integer out of range: %s\n", str);
         return KEY_VALUE_MAPPING_NOT_FOUND;
     }
@@ -222,7 +220,7 @@
                 break;
             }
         } else if (strcmp(type, "int") == 0) {
-            if (verify_int(val, &int_params_store->s32) == 0) {
+            if (verify_int(val, &int_params_store->sint) == 0) {
                 *out++ = (char *) int_params_store++;
             } else {
                 ret = (DISPATCH_INVALID_TEST_DATA);
@@ -245,7 +243,7 @@
             }
         } else if (strcmp(type, "exp") == 0) {
             int exp_id = strtol(val, NULL, 10);
-            if (get_expression(exp_id, &int_params_store->s32) == 0) {
+            if (get_expression(exp_id, &int_params_store->sint) == 0) {
                 *out++ = (char *) int_params_store++;
             } else {
                 ret = (DISPATCH_INVALID_TEST_DATA);