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strerror, strerror_s, strerrorlen_s

From cppreference.com

< c‎ | string‎ | byte

Compiler support
Language
Headers
Type support
Program utilities
Variadic function support
Error handling
Dynamic memory management
Strings library
Algorithms
Numerics
Date and time utilities
Input/output support
Localization support
Concurrency support (C11)
Technical Specifications
Symbol index

Strings library

Null-terminated byte strings
Null-terminated multibyte strings
Null-terminated wide strings

Null-terminated byte strings

Functions

Character manipulation

isalnum
isalpha
islower
isupper
isdigit