SEI CERT C Coding Standard

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isalnum()

isalpha()

isascii()XSI

isblank()

iscntrl()

isdigit()

isgraph()

islower()

isprint()

ispunct()

isspace()

isupper()

isxdigit()

toascii()XSI

toupper()

tolower()

NOTE: XSI denotes an X/Open System Interfaces Extension to ISO/IEC 9945—POSIX. These functions are not defined by the C Standard.

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