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Rec. 04. Integers (INT)

Created by Barbara White, last modified by David Svoboda on May 20, 2025

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INT00-C. Understand the data model used by your implementation(s)
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INT01-C. Use size_t or rsize_t for all integer values representing the size of an object
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INT02-C. Understand integer conversion rules
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INT04-C. Enforce limits on integer values originating from tainted sources
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INT05-C. Do not use input functions to convert character data if they cannot handle all possible inputs
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INT07-C. Use only explicitly signed or unsigned char type for numeric values
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INT08-C. Verify that all integer values are in range
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INT09-C. Ensure enumeration constants map to unique values
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INT10-C. Do not assume a positive remainder when using the % operator
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INT12-C. Do not make assumptions about the type of a plain int bit-field when used in an expression
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INT13-C. Use bitwise operators only on unsigned operands
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INT14-C. Avoid performing bitwise and arithmetic operations on the same data
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INT15-C. Use intmax_t or uintmax_t for formatted IO on programmer-defined integer types
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INT16-C. Do not make assumptions about representation of signed integers
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INT17-C. Define integer constants in an implementation-independent manner
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INT18-C. Evaluate integer expressions in a larger size before comparing or assigning to that size

Information for Editors
To have a new guideline automatically listed above be sure to label it int and recommendation.

Risk Assessment Summary

Rule	Severity	Likelihood	Detectable	Repairable	Priority	Level
INT00-C	High	Unlikely		High	P3	L3
INT01-C	Medium	Probable		Medium	P8	L2
INT02-C	Medium	Probable		Medium	P8	L2
INT04-C	High	Probable		High	P6	L2
INT05-C	Medium	Probable		High	P4	L3
INT07-C	Medium	Probable		Medium	P8	L2
INT08-C	Medium	Probable		High	P4	L3
INT09-C	Low	Probable		Medium	P4	L3
INT10-C	High	Unlikely		High	P3	L3
INT12-C	Low	Unlikely		Medium	P2	L3
INT13-C	High	Unlikely		Medium	P6	L2
INT14-C	Medium	Unlikely		Medium	P4	L3
INT15-C	High	Unlikely		Medium	P6	L2
INT16-C	Medium	Unlikely		High	P2	L3
INT17-C	High	Probable		Low	P18	L1
INT18-C	High	Likely		Medium	P18	L1

Related Rules and Recommendations

DCL31-C. Declare identifiers before using them

FIO09-C. Be careful with binary data when transferring data across systems

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