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C standard library (libc)
General topics
Data types Character classification Strings Mathematics File input/output Date/time Localization Memory allocation Process control Signals Alternative tokens
Miscellaneous headers
<assert.h> <errno.h> <setjmp.h> <stdarg.h>
v t e

C character classification is a group of operations in the C standard library that test a character for membership in a particular class of characters; such as alphabetic, control, etc. Both single-byte, and wide characters are supported.^[1]

^ ISO/IEC 9899:1999 specification (PDF). p. 193, § 7.4.