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#include <stddef.h>
#include <stdint.h>
int memcmp(void *s1, const void *s2, size_t n)
{
unsigned char *a = (unsigned char *) s1;
unsigned char *b = (unsigned char *) s2;
for (size_t i=0;i<n;i++)
if (a[i] != b[i]) return a[i] - b[i];
return 0;
}
void *memcpy(void *dest, const void *src, size_t n)
{
unsigned char *d = (unsigned char *) dest;
unsigned char *s = (unsigned char *) src;
for (size_t i=0;i<n;i++) d[i] = s[i];
return dest;
}
void *memmove(void *dest, const void *src, size_t n)
{
unsigned char *d = (unsigned char *) dest;
unsigned char *s = (unsigned char *) src;
if (d < s)
for (size_t i=0;i<n;i++)
d[i] = s[i];
else
for (size_t i=n;i!=0;i--)
d[i-1] = s[i-1];
return dest;
}
void *memset(void *s, int c, size_t n)
{
unsigned char *str = (unsigned char *) s;
for (size_t i=0;i<n;i++) str[i] = c;
return s;
}
size_t strlen(const char *s)
{
size_t len = 0;
while (s[++len]);
return len;
}
char *hex(uint32_t n, char *buf)
{
buf[0] = '0'; buf[1] = 'x';
for (int i=0;i<8;i++)
{
int digit = (n >> (i * 4)) & 0xF;
if (digit < 10)
buf[9 - i] = '0' + digit;
else
buf[9 - i] = 'A' + (digit - 10);
}
return buf;
}
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