mini-riscv-os/08-BlockDeviceDriver/string.c

#include "string.h"

void *memset(void *dst, int c, unsigned int n)
{
  char *cdst = (char *)dst;
  int i;
  for (i = 0; i < n; i++)
  {
    cdst[i] = c;
  }
  return dst;
}

void *
memcpy(void *dst, const void *src, unsigned int n)
{
  return memmove(dst, src, n);
}

void *
memmove(void *dst, const void *src, unsigned int n)
{
  const char *s;
  char *d;

  s = src;
  d = dst;
  if (s < d && s + n > d)
  {
    s += n;
    d += n;
    while (n-- > 0)
      *--d = *--s;
  }
  else
    while (n-- > 0)
      *d++ = *s++;

  return dst;
}