LANG.TYPE.CSUF : Confusing Literal Suffix

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CodeSonar^® 9.2p0

CONFIDENTIAL

CodeSecure Inc

C and C++

LANG.TYPE.CSUF : Confusing Literal Suffix

Summary

Lower case 'l' is used as a literal suffix.

(Using 'L' instead removes the potential for misreading as numeric character '1'.)

Properties

Class Name

Confusing Literal Suffix

Significance

style

Mnemonic

LANG.TYPE.CSUF

Categories

MisraC2025	MisraC2025:7.3	The lowercase character "l" shall not be used in a literal suffix
MisraC2023	MisraC2023:7.3	The lowercase character "l" shall not be used in a literal suffix
Misra2012	Misra2012:7.3	The lowercase character "l" shall not be used in a literal suffix
AUTOSARC++14	AUTOSARC++14:M2-13-4	Literal suffixes shall be upper case.
MisraC++2008	MisraC++2008:2-13-4	Literal suffixes shall be upper case.
MisraC++2023	MisraC++2023:5.13.5	The lowercase form of "L" shall not be used as the first character in a literal suffix
	MisraC++2023:5.13.6	An integer literal of type long long shall not use a single L or l in any suffix
CWE	CWE:710	Improper Adherence to Coding Standards
CERT-C	CERT-C:DCL16-C	Use "L," not "l," to indicate a long value
JSF++	JSF++:14	Literal suffixes shall use uppercase rather than lowercase letters.

Availability

Available for C and C++.

Enabling

Checks for this warning class are disabled by default, and require the unnormalized C ASTs for the project. To enable them, add the following WARNING_FILTER rule and RETAIN_UNNORMALIZED_C_AST specification to the project configuration file.

RETAIN_UNNORMALIZED_C_AST = Yes
WARNING_FILTER += allow class="Confusing Literal Suffix"

Note that retaining the unnormalized ASTs will increase the disk space used to store the project representation, and may make the analysis take longer.

Example

unsigned long a = 0Lu;  
unsigned long b = 0lU; /* 'Confusing Literal Suffix warning issued here */
long long c = 0LL;
long long d = 0ll;     /* 'Confusing Literal Suffix warning issued here */
long double e = 1.2L;
long double f = 2.4l;  /* 'Confusing Literal Suffix warning issued here */

Relevant Configuration File Parameters

The following configuration file parameters affect checks for this warning class.

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