string.c File Reference

#include "string.h"
#include <stddef.h>
#include <stdarg.h>
#include "../memory/memory.h"

Functions
size_t	strlen (const char *str)
	Determine the length of a string.
size_t	strnlen (const char *str, size_t max_len)
	Determine the length of a fixed-size string.
char *	strrev (char *str)
	Reverses string.
char *	strcpy (char *dest, const char *src)
	Copies string.
char *	strncpy (char *dest, const char *src, int n)
	Copies string with maximum length.
int	strncmp (const char *str1, const char *str2, int n)
	Compares two strings with maximum length.
char	tolower (char c)
	Converts ASCII letter to lowercase.
int	istrncmp (const char *str1, const char *str2, int n)
int	strnlen_terminator (const char *str, int max, char terminator)
	Calculates string length with custom terminator.
char *	itoa (long num, char *str, int base)
	Converts signed number to string.
char *	uitoa (unsigned long num, char *str, int base)
	Converts unsigned number to string.
char *	kvsprintf (char *buf, const char *fmt, va_list args)
	Kernel vsprintf params: %% c s p l(mod) d i x.
char *	ksprintf (char *buf, const char *fmt,...)
	Kernel sprintf params: %% c s p l(mod) d i x.
int	is_digit (char c)
	Determines if given char is an ASCII digit.
int	to_numeric_digit (char c)
	Converts ASCII digit to numeric.
int	strcmp (const char *str1, const char *str2)
	Compares two strings.

Function Documentation

is_digit()

int is_digit

(

char

c

)

Determines if given char is an ASCII digit.

Parameters

c	Character to test

Returns

int 1 if given char is digit

istrncmp()

int istrncmp	(	const char *	str1,
		const char *	str2,
		int	n
	)

References tolower().

itoa()

char * itoa	(	long	num,
		char *	str,
		int	base
	)

Converts signed number to string.

Parameters

num	Long to convert
str	Buffer
base	Base to use when converting the number

Returns

char* Buffer

References base, and strrev().

ksprintf()

char * ksprintf	(	char *	buf,
		const char *	fmt,
			...
	)

Kernel sprintf params: %% c s p l(mod) d i x.

Parameters

buf	Buffer
fmt	Text to format
...	Args

Returns

char* Buffer

References kvsprintf().

kvsprintf()

char * kvsprintf	(	char *	buf,
		const char *	fmt,
		va_list	args
	)

Kernel vsprintf params: %% c s p l(mod) d i x.

Parameters

buf	Buffer
fmt	Text to format
va_list	arguments

Returns

char* Buffer

References itoa(), memcpy(), memset(), strlen(), and uitoa().

strcmp()

int strcmp	(	const char *	str1,
		const char *	str2
	)

Compares two strings.

Parameters

str1	String
str2	String

Returns

int 0 -> str1==str2, <0 -> str1<str2, >0 ->str1>str2

References strlen(), and strncmp().

strcpy()

char * strcpy	(	char *	dest,
		const char *	src
	)

Copies string.

Parameters

dest	Destination buffer
src	Input buffer

Returns

char* Pointer to destination buffer

strlen()

size_t strlen

(

const char *

str

)

Determine the length of a string.

Parameters

str

String

Returns

size_t Length

strncmp()

int strncmp	(	const char *	str1,
		const char *	str2,
		int	n
	)

Compares two strings with maximum length.

Parameters

str1	String
str2	String
n	Max length

Returns

int 0 -> str1==str2, <0 -> str1<str2, >0 ->str1>str2

strncpy()

char * strncpy	(	char *	dest,
		const char *	src,
		int	n
	)

Copies string with maximum length.

Parameters

dest	Destination buffer
src	Input buffer
n	Max length

Returns

char* Pointer to destination buffer

strnlen()

size_t strnlen	(	const char *	str,
		size_t	max_len
	)

Determine the length of a fixed-size string.

Parameters

str
max_len

Returns

size_t

strnlen_terminator()

int strnlen_terminator	(	const char *	str,
		int	max,
		char	terminator
	)

Calculates string length with custom terminator.

Parameters

str	String to measure length
max	Max length of string
terminator	Custom terminator

Returns

int Length

strrev()

char * strrev

(

char *

str

)

Reverses string.

Parameters

str	String to reverse

Returns

char* str

References strlen().

to_numeric_digit()

int to_numeric_digit

(

char

c

)

Converts ASCII digit to numeric.

Parameters

c	ASCII digit

Returns

int Numeric digit

tolower()

char tolower

(

char

c

)

Converts ASCII letter to lowercase.

Parameters

c	Input letter

Returns

char Lowercase letter

uitoa()

char * uitoa	(	unsigned long	num,
		char *	str,
		int	base
	)

Converts unsigned number to string.

Parameters

num	Unsigned Long to convert
str	Buffer
base	Base to use when converting the number

Returns

char* Buffer

References base, and strrev().