This rule is part of MISRA C++:2023.
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Rule 21.2.1 - The library functions atof, atoi, atol and atoll from
<cstdlib> shall not be used
[C11] / 7.22.1; Undefined 1
Category: Required
Analysis: Decidable,Single Translation Unit
Amplification
These functions shall not be called or have their addresses taken, and no macro having one of these names shall be expanded.
Note: the same functions from <stdlib.h> are also covered by this rule.
Rationale
These functions have undefined behaviour associated with them when the string cannot be converted. The C++ library provides safer
conversion routines — see [string.conversions], [charconv.from.chars].
Note: [charconv.from.chars] was changed from [utility.from.chars] as the result of a defect report against the C++ Standard.
Example
int32_t f( const char * numstr )
{
return atoi( numstr ); // Non-compliant
}
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