#ifndef __STDLIB_H__
#define __STDLIB_H__

#include <sys/types.h>

#ifndef NULL
#define NULL    ((void *)0)
#endif

int atexit(void (*function)(void));
void exit(int status);
_Noreturn void abort(void);

void *calloc(size_t num, size_t sz);
void *malloc(size_t sz);
void free(void *buf);

int atoi(const char *nptr);
unsigned long strtoul(const char *nptr, char **endptr, int base);

static inline int isdigit(char c)
{
	return (c >= '0') && (c <= '9');
}

static inline int isupper(char c)
{
	return (c >= 'A') && (c <= 'Z');
}

static inline int islower(char c)
{
	return (c >= 'a') && (c <= 'z');
}

static inline int isalpha(char c)
{
	return (isupper(c)) || (islower(c));
}

static inline int isspace(char C) {
  return C == ' ' || C == '\f' || C == '\n' || C == '\r' || C == '\t' ||
         C == '\v';
}


#endif /* __STDLIB_H__ */