stdlib.h(3avr)

💖 stdlib.h 💖

okay bestie, gather round, because today we're doing stdlib.h from the AVR-LibC manual (that's the 3avr section, iykyk). this is the standard library header that's basically the utility belt of your AVR C adventures — memory, math-ish conversions, random numbers, exiting with drama. it's giving backbone of your program, no cap. 🫶

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✨ NAME ✨

stdlib.h — the header. that's it. that's the name. iconic, minimal, slay. 💅

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🌈 SYNOPSIS 🌈

🎀 Data Structures

• struct div_t
• struct ldiv_t

🍓 Macros

• #define RAND_MAX 0x7FFF

🦋 Typedefs

• typedef int(* __compar_fn_t) (const void *, const void *)

💜 Functions

the whole squad, fr fr:

void abort (void)
int abs (int __i)
long labs (long __i)
void * bsearch (const void *__key, const void *__base, size_t __nmemb, size_t __size, int(*__compar)(const void *, const void *))
div_t div (int __num, int __denom) __asm__('__divmodhi4')
ldiv_t ldiv (long __num, long __denom) __asm__('__divmodsi4')
void qsort (void *__base, size_t __nmemb, size_t __size, __compar_fn_t __compar)
long strtol (const char *__nptr, char **__endptr, int __base)
unsigned long strtoul (const char *__nptr, char **__endptr, int __base)
long atol (const char *__s)
int atoi (const char *__s)
void exit (int __status)
void * malloc (size_t __size)
void free (void *__ptr)
void * calloc (size_t __nele, size_t __size)
void * realloc (void *__ptr, size_t __size)
float strtof (const char *__nptr, char **__endptr)
double strtod (const char *__nptr, char **__endptr)
long double strtold (const char *__nptr, char **__endptr)
int atexit (void(*func)(void))
float atoff (const char *__nptr)
double atof (const char *__nptr)
long double atofl (const char *__nptr)
int rand (void)
void srand (unsigned int __seed)
int rand_r (unsigned long *__ctx)

👑 Variables

• size_t __malloc_margin
• char * __malloc_heap_start
• char * __malloc_heap_end

🔥 Non-standard (i.e. non-ISO C) functions.

bestie these are the extra ones, the bonus tracks, the deluxe edition 💖:

#define RANDOM_MAX   0x7FFFFFFF
char * itoa (int val, char *s, int radix)
char * ltoa (long val, char *s, int radix)
char * utoa (unsigned int val, char *s, int radix)
char * ultoa (unsigned long val, char *s, int radix)
long random (void)
void srandom (unsigned long __seed)
long random_r (unsigned long *__ctx)

🧚 Conversion functions for double arguments.

the float-to-string girlies, plus the flags that control their whole vibe ✨:

#define DTOSTR_ALWAYS_SIGN   0x01        /* put '+' or ' ' for positives */
#define DTOSTR_PLUS_SIGN   0x02        /* put '+' rather than ' ' */
#define DTOSTR_UPPERCASE   0x04        /* put 'E' rather 'e' */
#define EXIT_SUCCESS   0
#define EXIT_FAILURE   1
char * ftostre (float __val, char *__s, unsigned char __prec, unsigned char __flags)
char * dtostre (double __val, char *__s, unsigned char __prec, unsigned char __flags)
char * ldtostre (long double __val, char *__s, unsigned char __prec, unsigned char __flags)
char * ftostrf (float __val, signed char __width, unsigned char __prec, char *__s)
char * dtostrf (double __val, signed char __width, unsigned char __prec, char *__s)
char * ldtostrf (long double __val, signed char __width, unsigned char __prec, char *__s)

lowkey obsessed with how DTOSTR_ALWAYS_SIGN puts '+' or ' ' for positives, DTOSTR_PLUS_SIGN puts '+' rather than ' ', and DTOSTR_UPPERCASE puts 'E' rather 'e'. three tiny flags, maximum control. periodt. 💅

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🌸 Author 🌸

Generated automatically by Doxygen for AVR-LibC from the source code. so technically the author is a robot 🤖 but honestly? she ate.

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and that's the whole page, bestie!! go forth and malloc responsibly 🫶✨

this was AVR-LibC, Version 2.2.1, serving stdlib.h in section 3avr — catch you in the next manpage, mwah 💖🎀🦋