BADFUNC.CCTYPE : Use of <cctype> Function

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C and C++

BADFUNC.CCTYPE : Use of <cctype> Function

要旨

A use of one of the character-handling functions defined in <cctype>: isalnum(), isalpha(), iscntrl(), isdigit(), isgraph(), islower(), isprint(), ispunct(), isspace(), isblank(), isupper(), isxdigit(), tolower(), toupper().

Using these functions can lead to undefined behavior.

プロパティ

クラス名

Use of <cctype> Function

日本語クラス名

Use of <cctype> Function

クラス分類

スタイル (style)

ニーモニック

BADFUNC.CCTYPE

カテゴリー

MisraC++2023	MisraC++2023:24.5.1	The character handling functions from <cctype> and <cwctype> shall not be used
CWE	CWE:676	Use of Potentially Dangerous Function
OWASP-2021	OWASP-2021:A4	Insecure design
OWASP-2025	OWASP-2025:A06	Insecure Design

対応言語

C++ のみ利用可能です。 C は利用できません。

有効/無効設定

このワーニングクラスのチェックはデフォルトで無効になっています。チェックを有効にするにはプロジェクト設定ファイル（configuration file）に以下の WARNING_FILTER ルールを追加してください。

WARNING_FILTER += allow class="Use of <cctype> Function"

例

#include <cctype>
#include <locale>

void use_of_cctype( char c ) {
    while( std::isdigit( c ) )                  // 'Use of <cctype>' Function warning issued here
                                                // ('Negative Character Value' warning also issued)
        break;
    while( std::isdigit( c, std::locale {} ) )                  // ok: defined in <locale> (not <cctype>)
        break;
}

BADFUNC.CCTYPE : Use of <cctype> Function

要旨

プロパティ

例

関連のある設定ファイルパラメータ