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strlen, strnlen_s
From cppreference.com
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c
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string
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byte
C
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
[edit]
Strings library
Null-terminated byte strings
Null-terminated multibyte strings
Null-terminated wide strings
[edit]
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
atoi
atol
atoll
(C99)
atof