Return values for functions in described in Register variables.
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#define | REGVAR_ERROR_OK 0 |
| all ok
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#define | REGVAR_ERROR_ARG (-1) |
| function arguments are bad
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#define | REGVAR_ERROR_RANGE (-2) |
| the definition range is bad
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#define | REGVAR_ERROR_NAME (-3) |
| the provided name(s) can't be accepted
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