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#include <string.h>
#include <stdint.h>
#include <ctype.h>
void* memcpy(void* dest, const void* src, size_t len)
{
const char* s = src;
char *d = dest;
if ((((uintptr_t)dest | (uintptr_t)src) & (sizeof(uintptr_t)-1)) == 0) {
while ((void*)d < (dest + len - (sizeof(uintptr_t)-1))) {
*(uintptr_t*)d = *(const uintptr_t*)s;
d += sizeof(uintptr_t);
s += sizeof(uintptr_t);
}
}
while (d < (char*)(dest + len))
*d++ = *s++;
return dest;
}
void* memset(void* dest, int byte, size_t len)
{
if ((((uintptr_t)dest | len) & (sizeof(uintptr_t)-1)) == 0) {
uintptr_t word = byte & 0xFF;
word |= word << 8;
word |= word << 16;
word |= word << 16 << 16;
uintptr_t *d = dest;
while (d < (uintptr_t*)(dest + len))
*d++ = word;
} else {
char *d = dest;
while (d < (char*)(dest + len))
*d++ = byte;
}
return dest;
}
size_t strlen(const char *s)
{
const char *p = s;
while (*p)
p++;
return p - s;
}
int strcmp(const char* s1, const char* s2)
{
unsigned char c1, c2;
do {
c1 = *s1++;
c2 = *s2++;
} while (c1 != 0 && c1 == c2);
return c1 - c2;
}
char* strcpy(char* dest, const char* src)
{
char* d = dest;
while ((*d++ = *src++))
;
return dest;
}
long atol(const char* str)
{
long res = 0;
int sign = 0;
while (*str == ' ')
str++;
if (*str == '-' || *str == '+') {
sign = *str == '-';
str++;
}
while (*str) {
res *= 10;
res += *str++ - '0';
}
return sign ? -res : res;
}
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