py, unix: Allow to compile with -Wsign-compare.

See issue #699.

2 files changed, 4 insertions, 5 deletions

diff --git a/unix/main.c b/unix/main.c
index d63512778..346324e7c 100644
--- a/unix/main.c
+++ b/unix/main.c
@@ -355,7 +355,7 @@ int main(int argc, char **argv) {
     mp_obj_list_get(mp_sys_path, &path_num, &path_items);
     path_items[0] = MP_OBJ_NEW_QSTR(MP_QSTR_);
     char *p = path;
-    for (int i = 1; i < path_num; i++) {
+    for (mp_uint_t i = 1; i < path_num; i++) {
         char *p1 = strchr(p, PATHLIST_SEP_CHAR);
         if (p1 == NULL) {
             p1 = p + strlen(p);
@@ -364,7 +364,7 @@ int main(int argc, char **argv) {
             // Expand standalone ~ to $HOME
             CHECKBUF(buf, PATH_MAX);
             CHECKBUF_APPEND(buf, home, strlen(home));
-            CHECKBUF_APPEND(buf, p + 1, p1 - p - 1);
+            CHECKBUF_APPEND(buf, p + 1, (size_t)(p1 - p - 1));
             path_items[i] = MP_OBJ_NEW_QSTR(qstr_from_strn(buf, CHECKBUF_LEN(buf)));
         } else {
             path_items[i] = MP_OBJ_NEW_QSTR(qstr_from_strn(p, p1 - p));
diff --git a/unix/modffi.c b/unix/modffi.c
index fb0c820d2..5f33e7721 100644
--- a/unix/modffi.c
+++ b/unix/modffi.c
@@ -206,7 +206,7 @@ MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(ffimod_func_obj, 4, 4, ffimod_func);
 
 STATIC void call_py_func(ffi_cif *cif, void *ret, void** args, mp_obj_t func) {
     mp_obj_t pyargs[cif->nargs];
-    for (int i = 0; i < cif->nargs; i++) {
+    for (uint i = 0; i < cif->nargs; i++) {
         pyargs[i] = mp_obj_new_int(*(mp_int_t*)args[i]);
     }
     mp_obj_t res = mp_call_function_n_kw(func, cif->nargs, 0, pyargs);
@@ -309,8 +309,7 @@ STATIC mp_obj_t ffifunc_call(mp_obj_t self_in, mp_uint_t n_args, mp_uint_t n_kw,
 
     ffi_arg values[n_args];
     void *valueptrs[n_args];
-    int i;
-    for (i = 0; i < n_args; i++) {
+    for (uint i = 0; i < n_args; i++) {
         mp_obj_t a = args[i];
         if (a == mp_const_none) {
             values[i] = 0;