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This rule appears in the C++ Secure Coding Standard as STR37-CPP. Arguments to character handling functions must be representable as an unsigned char.
References
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\[[ISO/IEC 9899:1999|AA. C References#ISO/IEC 9899-1999]\] Section 7.4, "Character handling <{{ctype.h}}>"
\[[Kettlewell 02|AA. C References#Kettle 02]\] Section 1.1, "<{{ctype.h}}> And Characters Types"
\[[MITRE 07|AA. C References#MITRE 07]\] [CWE ID 704|http://cwe.mitre.org/data/definitions/704.html], "Incorrect Type Conversion or Cast," [CWE ID 686|http://cwe.mitre.org/data/definitions/686.html], "Function Call With Incorrect Argument Type" |
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