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| CodeSonar® 9.2p0 | CONFIDENTIAL | CodeSecure Inc |
A two-argument arctangent function is passed 0 in the "y" argument position when it may also have been passed 0 in the "x" argument position.
| Class Name | Arctangent Domain Error | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Significance | reliability | |||||||||||||||||||||||||||||||||||||||||||||
| Mnemonic | MATH.DOMAIN.ATAN | |||||||||||||||||||||||||||||||||||||||||||||
| Categories |
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| Availability | Available for C and C++. |
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| Enabling | Checks for this warning class are enabled by
default. To disable them, add the following WARNING_FILTER rule to the
project configuration file.
WARNING_FILTER += discard class="Arctangent Domain Error" |
CodeSonar ships with library models that allow it to recognize functions such as libm atan2() that compute a two-argument arctangent. If one of these functions is called with zero in the "y" parameter position and may also have zero in the "x" parameter position, a warning will be issued.
If you have created a custom library model for some function f() in terms of one of these existing models, calls to f() will also be capable of triggering Arctangent Domain Error warnings.
Japanese (ja)
#include <math.h>
double use_atan2(double ind){
double a = atan2(1,1); /* ok: second (Y) argument is not zero */
double b = atan2(1,0); /* ok: first (X) argument is not zero */
double c = atan2(0,0); /* 'Arctangent Domain Error' warning issued here */
return a+b+c;
}
The following configuration file parameters affect checks for this warning class.
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