strdup with memory aligned

strdup.c

// based on original
// https://github.com/clibs/strdup/blob/master/strdup.

#define strdup_check 1
#define strdup_verbose 0
#define strdup_align(x) (((x)+15)&~15)  // 3 (4 bytes), 7 (8 bytes), 15 (16 bytes)

static char* strdup_aligned(const char *str) {
  int len;
  char* buf;
  
  #if strdup_check
  if (str == NULL || str[0] == 0x0) {
    #if strdup_verbose
    printf("[%s] error: string null\n", __FUNCTION__);
    #endif
    return NULL;
  }
  #endif

  len = strlen(str) + 1;
  buf = malloc(strdup_align(len));
  if (!buf) {
      #if strdup_verbose
      printf("[%s] error: memory alloc\n", __FUNCTION__);
      #endif	  
	  errno = ENOMEM;
	  return NULL;
  }

  #if strdup_verbose
  printf("[%s] len=%d aligned=%d\n", __FUNCTION__, len, strdup_align(len));
  #endif

  memset(buf, 0, len);
  memcpy(buf, str, len - 1);

  return buf;
}