access.c

Newlib 嵌入式 C库 标准实现代码

/* This is file ACCESS.C */
/*
 * Copyright (C) 1993 DJ Delorie
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms is permitted
 * provided that the above copyright notice and following paragraph are
 * duplicated in all such forms.
 *
 * This file is distributed WITHOUT ANY WARRANTY; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */

#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>

int access(const char *fn, int flags)
{
  struct stat s;
  if (stat(fn, &s))
    return -1;
  if (s.st_mode & S_IFDIR)
    return 0;
  if (flags & W_OK)
  {
    if (s.st_mode & S_IWRITE)
      return 0;
    return -1;
  }
  return 0;
}