utils.c File Reference

#include "utils.h"
#include "types.h"

Include dependency graph for utils.c:

Go to the source code of this file.

Functions
int	abs (int x)
int	strlen (const char *s)
int	strcmp (const char *a, const char *b)
void	strcpy (char *dest, const char *src)
void	strcat (char *dest, const char *src)
void	itoa (int num, char *str)
	itoa converts an integer to a decimal string
int	atoi (const char *str)
	atoi converts a decimal string to an integer
void	srand (uint32_t seed)
	srand seeds the random number generator
uint32_t	rand (void)
	rand returns a pseudo-random 32 bit integer
int	pargs (char *line, char *args[])
	pargs parses a command line into an argument array

Variables
static uint32_t	rng_state = 123456789

Function Documentation

abs()

int abs

(

int

x

)

Definition at line 5 of file utils.c.

Referenced by __drw().

atoi()

int atoi

(

const char *

str

)

atoi converts a decimal string to an integer

atoi is a function that parses a string of digit characters and returns the corresponding integer value

Parameters

str,the

null-terminated decimal string to parse

using atoi is done with

#include "../lib/utils.h" //or just utils.h
int value = atoi("42");

See also

itoa()

Definition at line 118 of file utils.c.

Referenced by __shell().

itoa()

void itoa	(	int	num,
		char *	str )

itoa converts an integer to a decimal string

itoa is a function that converts a signed integer into a null-terminated decimal string representation

Parameters

num,the	integer to convert
str,the	output buffer for the resulting string

using itoa is done with

#include "../lib/utils.h" //or just utils.h
char buff[12];
itoa(-42, buff);

See also

atoi(), prtd()

Definition at line 49 of file utils.c.

Referenced by __getcpu(), and __prtd().

pargs()

int pargs	(	char *	line,
		char *	args[] )

pargs parses a command line into an argument array

pargs is a function that splits a string into an argv-style array of null-terminated arguments, supporting quoted strings and skipping leading '/' characters

Parameters

line,the	input line to parse (modified in-place)
args,the	output array of string pointers

using pargs is done with

#include "../lib/utils.h" //or just utils.h
char input[100];
char *args[MAX_ARGS];
rdln(input, 100);
int argc = pargs(input, args);

See also

shell(), MAX_ARGS

Definition at line 189 of file utils.c.

References MAX_ARGS.

Referenced by __shell().

rand()

uint32_t rand

(

void

)

rand returns a pseudo-random 32 bit integer

rand is a function that generates a random number using a xor-shift algorithm on the internal rng state

using rand is done with

#include "../lib/utils.h" //or just utils.h
uint32_t rnd = rand();

See also

srand()

Definition at line 162 of file utils.c.

References rng_state.

srand()

void srand

(

uint32_t

seed

)

srand seeds the random number generator

srand is a function that initializes the xor-shift rng state with a given seed value

Parameters

seed,the

initial seed value for the rng

using srand is done with

#include "../lib/utils.h" //or just utils.h
srand(12345);

See also

rand()

Definition at line 144 of file utils.c.

References rng_state.

strcat()

void strcat	(	char *	dest,
		const char *	src )

Definition at line 26 of file utils.c.

Referenced by __getcpu().

strcmp()

int strcmp	(	const char *	a,
		const char *	b )

Definition at line 15 of file utils.c.

Referenced by ___init(), __fsdelete(), __fsfind(), and __shell().

strcpy()

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

Definition at line 21 of file utils.c.

Referenced by __fsadd(), and __getcpu().

strlen()

int strlen

(

const char *

s

)

Definition at line 9 of file utils.c.

Referenced by __shell().

Variable Documentation

rng_state

uint32_t rng_state = 123456789

static

Definition at line 127 of file utils.c.

Referenced by rand(), and srand().