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Null-terminated byte strings

A null-terminated byte string (NTBS) is a sequence of nonzero bytes followed by a byte with value zero (the terminating null character). Each byte in a byte string encodes one character of some character set. For example, the character array {'\x63','\x61','\x74','\0'} is an NTBS holding the string "cat" in ASCII encoding.

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Functions

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Character classification
Defined in header <ctype.h>
checks if a character is alphanumeric
(function)
checks if a character is alphabetic
(function)
checks if a character is lowercase
(function)
checks if a character is an uppercase character
(function)
checks if a character is a digit
(function)
checks if a character is a hexadecimal character
(function)
checks if a character is a control character
(function)
checks if a character is a graphical character
(function)
checks if a character is a space character
(function)
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(C99)
 checks if a character is a blank character
(function)
checks if a character is a printing character
(function)
checks if a character is a punctuation character
(function)
Character manipulation
converts a character to lowercase
(function)
converts a character to uppercase
(function)

Note: additional functions whose names begin with either to or is, followed by a lowercase letter, may be added to the header ctype.h in future and should not be defined by programs that include that header.

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ASCII values characters

iscntrl
iswcntrl

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isprint
iswprint

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isspace
iswspace

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isblank
iswblank

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isgraph
iswgraph

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ispunct
iswpunct

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isalnum
iswalnum

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isalpha
iswalpha

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isupper
iswupper

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islower
iswlower

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isdigit
iswdigit

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isxdigit
iswxdigit

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decimal hexadecimal octal
0–8 \x0–\x8 \0–\10 control codes (NUL, etc.) -≠0 0 0 0 0 0 0 0 0 0 0 0
9 \x9 \11 tab (\t) -≠0 0 -≠0 -≠0 0 0 0 0 0 0 0 0
10–13 \xA–\xD \12–\15 whitespaces (\n, \v, \f, \r) -≠0 0 -≠0 0 0 0 0 0 0 0 0 0
14–31 \xE–\x1F \16–\37 control codes -≠0 0 0 0 0 0 0 0 0 0 0 0
32 \x20 \40 space 0 -≠0 -≠0 -≠0 0 0 0 0 0 0 0 0
33–47 \x21–\x2F \41–\57 !"#$%&'()*+,-./ 0 -≠0 0 0 -≠0 -≠0 0 0 0 0 0 0
48–57 \x30–\x39 \60–\71 0123456789 0 -≠0 0 0 -≠0 0 -≠0 0 0 0 -≠0 -≠0
58–64 \x3A–\x40 \72–\100 :;<=>?@ 0 -≠0 0 0 -≠0 -≠0 0 0 0 0 0 0
65–70 \x41–\x46 \101–\106 ABCDEF 0 -≠0 0 0 -≠0 0 -≠0 -≠0 -≠0 0 0 -≠0
71–90 \x47–\x5A \107–\132 GHIJKLMNOP
QRSTUVWXYZ 		0 -≠0 0 0 -≠0 0 -≠0 -≠0 -≠0 0 0 0
91–96 \x5B–\x60 \133–\140 [\]^_` 0 -≠0 0 0 -≠0 -≠0 0 0 0 0 0 0
97–102 \x61–\x66 \141–\146 abcdef 0 -≠0 0 0 -≠0 0 -≠0 -≠0 0 -≠0 0 -≠0
103–122 \x67–\x7A \147–\172 ghijklmnop
qrstuvwxyz 		0 -≠0 0 0 -≠0 0 -≠0 -≠0 0 -≠0 0 0
123–126 \x7B–\x7E \172–\176 {|}~ 0 -≠0 0 0 -≠0 -≠0 0 0 0 0 0 0
127 \x7F \177 backspace character (DEL) -≠0 0 0 0 0 0 0 0 0 0 0 0
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Conversions to and from numeric formats
Defined in header <stdlib.h>
converts a byte string to a floating-point value
(function)
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(C99)
 converts a byte string to an integer value
(function)
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(C99)
 converts a byte string to an integer value
(function)
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(C99)
 converts a byte string to an unsigned integer value
(function)
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(C99)(C99)
 converts a byte string to a floating point value
(function)
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(C23)(C23)(C23)
 converts a floating point value to a byte string
(function)
Defined in header <inttypes.h>
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(C99)(C99)
 converts a byte string to intmax_t or uintmax_t
(function)
String manipulation
Defined in header <string.h>
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(C11)
 copies one string to another
(function)
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(C11)
 copies a certain amount of characters from one string to another
(function)
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(C11)
 concatenates two strings
(function)
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(C11)
 concatenates a certain amount of characters of two strings
(function)
transform a string so that strcmp would produce the same result as strcoll
(function)
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(C23)
 allocates a copy of a string
(function)
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(C23)
 allocates a copy of a string of specified size
(function)
String examination
Defined in header <string.h>
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(C11)
 returns the length of a given string
(function)
compares two strings
(function)
compares a certain amount of characters of two strings
(function)
compares two strings in accordance to the current locale
(function)
finds the first occurrence of a character
(function)
finds the last occurrence of a character
(function)
returns the length of the maximum initial segment that consists
of only the characters found in another byte string
(function)
returns the length of the maximum initial segment that consists
of only the characters not found in another byte string
(function)
finds the first location of any character in one string, in another string
(function)
finds the first occurrence of a substring of characters
(function)
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(C11)
 finds the next token in a byte string
(function)
Character array manipulation
Defined in header <string.h>
searches an array for the first occurrence of a character
(function)
compares two buffers
(function)
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(C23)(C11)
 fills a buffer with a character
(function)
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(C11)
 copies one buffer to another
(function)
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(C11)
 moves one buffer to another
(function)
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(C23)
 copies one buffer to another, stopping after the specified delimiter
(function)
Miscellaneous
Defined in header <string.h>
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(C11)(C11)
 returns a text version of a given error code
(function)

References

See also

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C++ documentation for Null-terminated byte strings
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- https://en.cppreference.com/w/c/string/byte -

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