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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
isxdigit
isblank (C99)

iscntrl
isgraph
isspace
isprint
ispunct
tolower
toupper

Conversions to and from numeric formats

atoiatolatoll (C99)
atof
strtolstrtoll (C99)
strtoulstrtoull (C99)

strtoimaxstrtoumax (C99)(C99)
strtofstrtodstrtold (C99)(C99)
strfromfstrfromdstrfroml (C23)(C23)(C23)

String manipulation

strcpystrcpy_s (C11)
strncpystrncpy_s (C11)
strcatstrcat_s (C11)

strncatstrncat_s (C11)
strxfrm
strdup (C23)