#pragma once

/**
 * The  memcmp() function compares the first n bytes (each interpreted as unsigned char) of the memory
 * areas s1 and s2.
 */
extern int memcmp(const void *restrict s1, const void *restrict s2, unsigned long n);

/**
 * The  memcpy()  function  copies n bytes from memory area src to memory area dest.
 * The memory areas must not overlap.
 */
extern void *memcpy(void *restrict dest, const void *restrict src, unsigned long n);

/**
 * The  memmove()  function copies n bytes from memory area src to memory area dest.  The memory areas
 * may overlap: copying takes place as though the bytes in src are first copied into a temporary array
 * that does not overlap src or dest, and the bytes are then copied from the temporary array to dest.
 */
extern void *memmove(void *dest, const void *src, unsigned long n);

/**
 * The  memset() function fills the first n bytes of the memory area pointed to by s with the constant
 * byte c.
 */
extern void *memset(void *restrict dest, int c, unsigned long n);

/**
 * The  strcmp()  function  compares  the two strings s1 and s2.  The locale is not taken into account
 * (for a locale-aware comparison, see strcoll(3)).  The comparison is done using unsigned characters.
 */
extern int strncmp(const char *restrict s1, const char *restrict s2, unsigned long n);

/**
 * Copys the string pointed to by src , into a string at the buffer pointer to by dest.
 * The dest buffer must be long enough to hold src.
 */
extern char *strcpy(char *restrict dest, const char *restrict src);

/**
 * Copys the string pointed to by src , into a string at the buffer pointer to by dest.
 * The dest buffer must be long enough to hold src or size n.
 */
extern char *strncpy(char *restrict dest, const char *restrict src, unsigned long n);

/**
 * @returns 1 if c is a space
 */
extern int isspace(int c);

/**
 * @returns 1 if c is a digit (0 - 9)
 */
extern int isdigit(int c);

/**
 * converts single digit int to base 36
 * @param i - int
 * @returns c - base 36 char
 */
extern char itoc(int i);

/**
 * converts single base 36 chat into int
 * @param c - base 36 char
 * @returns i - int
 */
extern int ctoi(char c);

/**
 * Converts the initial portiion of the string pointed to by s to int.
 * @param s - the string to convert
 * @returns the number inside s or 0 on error
 */
extern int atoi(const char* s);

/**
 * Converts the initial portiion of the string pointed to by s to long.
 * @param s - the string to convert
 * @returns the number inside s or 0 on error
 */
extern long int atol(const char* s);

/**
 * Converts the initial portiion of the string pointed to by s to long long.
 * @param s - the string to convert
 * @returns the number inside s or 0 on error
 */
extern long long int atoll(const char* s);

/**
 * Converts a integer to asci inside a string with a given radix (base).
 * @param n - the number to conver 
 * @param buffer - the string buffer
 * @param radix - the base to convert
 */
extern char *itoa(int n, char *buffer, int radix);

/**
 * Converts a long to asci inside a string with a given radix (base).
 * @param n - the number to conver 
 * @param buffer - the string buffer
 * @param radix - the base to convert
 */
extern char *ltoa(long int n, char *buffer, int radix);

/**
 * Converts a unsigned integer to asci inside a string with a given radix (base).
 * @param n - the number to conver 
 * @param buffer - the string buffer
 * @param radix - the base to convert
 */
extern char *utoa(unsigned int n, char *buffer, int radix);

/**
 * Converts a unsigned long to asci inside a string with a given radix (base).
 * @param n - the number to conver 
 * @param buffer - the string buffer
 * @param radix - the base to convert
 */
extern char *ultoa(unsigned long int n, char *buffer, int radix);

/**
 * Converts the string in str to an int value based on the given base.
 * The endptr is updated to where the string was no longer valid.
 * @param str - the string buffer
 * @param endptr - the endptr
 * @param base - the base to convert to
 * @returns 0 on error or success, error if endptr is still equal to str
 */
extern int strtoi(const char *str, char **endptr, int base);

/**
 * Converts the string in str to an long value based on the given base.
 * The endptr is updated to where the string was no longer valid.
 * @param str - the string buffer
 * @param endptr - the endptr
 * @param base - the base to convert to
 * @returns 0 on error or success, error if endptr is still equal to str
 */
extern long int strtol(const char *str, char **endptr, int base);

/**
 * Converts the string in str to an long long value based on the given base.
 * The endptr is updated to where the string was no longer valid.
 * @param str - the string buffer
 * @param endptr - the endptr
 * @param base - the base to convert to
 * @returns 0 on error or success, error if endptr is still equal to str
 */
extern long long int strtoll(const char *str, char **endptr, int base);