py/modstruct: Raise ValueError on unsupported format char.
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@ -120,8 +120,9 @@ STATIC mp_obj_t struct_calcsize(mp_obj_t fmt_in) {
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if (sz == 0) {
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sz = (mp_uint_t)mp_binary_get_size(fmt_type, *fmt, &align);
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}
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// TODO
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assert(sz != (mp_uint_t)-1);
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if (sz == 0) {
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nlr_raise(mp_obj_new_exception_msg(&mp_type_ValueError, "unsupported format"));
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}
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// Apply alignment
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size = (size + align - 1) & ~(align - 1);
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size += sz;
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