inc/std.h

#ifndef _STD_H
#define _STD_H

#include <stddef.h>
#include <stdint.h>

void *memset(void *s, int c, size_t n);
void *memcpy(void *dst, const void *src, size_t n);
void *memmove(void *dst, const void *src, size_t n);
int memcmp(const void *a, const void *b, size_t n);

size_t strlen(const char *str);
int strcmp(const char *a, const char *b);

#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__

#define be16toh(v) __builtin_bswap16(v)
#define be32toh(v) __builtin_bswap32(v)
#define be64toh(v) __builtin_bswap64(v)

#define htobe16(v) __builtin_bswap16(v)
#define htobe32(v) __builtin_bswap32(v)
#define htobe64(v) __builtin_bswap64(v)

#define le16toh(v) (v)
#define le32toh(v) (v)
#define le64toh(v) (v)

#define htole16(v) (v)
#define htole32(v) (v)
#define htole64(v) (v)

#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__

#define be16toh(v) (v)
#define be32toh(v) (v)
#define be64toh(v) (v)

#define htobe16(v) (v)
#define htobe32(v) (v)
#define htobe64(v) (v)

#define le16toh(v) __builtin_bswap16(v)
#define le32toh(v) __builtin_bswap32(v)
#define le64toh(v) __builtin_bswap64(v)

#define htole16(v) __builtin_bswap16(v)
#define htole32(v) __builtin_bswap32(v)
#define htole64(v) __builtin_bswap64(v)

#else /* __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__ && __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__ */

#error "Unsupported byte order"

#endif

#endif  /* STD_H */