micropython/stm/std.h

typedef unsigned int size_t;

void __assert_func(void);

void *memcpy(void *dest, const void *src, size_t n);
void *memmove(void *dest, const void *src, size_t n);
void *memset(void *s, int c, size_t n);

size_t strlen(const char *str);
int strcmp(const char *s1, const char *s2);
int strncmp(const char *s1, const char *s2, size_t n);
char *strcpy(char *dest, const char *src);
char *strcat(char *dest, const char *src);
char *strchr(const char *s, int c);
char *strstr(const char *haystack, const char *needle);

int printf(const char *fmt, ...);
int snprintf(char *str, size_t size, const char *fmt, ...);