[OpenSIPS-Devel] [opensips] math_eval() does not handle negative numbers (#788)

[rrb3942]

Attempting to use a negative number with math_eval in the mathops module results in a 'Mismatched tokens expression'

Example:
math_eval("10 + (-5)", "$var(test)");
Gives the following errors:
ERROR:mathops:pop_number: RPN Stack Empty
ERROR:mathops:pop_number: RPN Stack Empty
ERROR:mathops:evaluate_rpn_output: Parse expr error: stack has 0 elements
ERROR:mathops:evaluate_exp: Mismatched tokens in expression: <10 + (-5)>

Happens with or without the parentheses. 

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Reply to this email directly or view it on GitHub:
https://github.com/OpenSIPS/opensips/issues/788
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