purge

一个C格式的脚本处理函数库源代码,可让你的C程序具有执行C格式的脚本文件

#! /usr/bin/env slsh
% -*- mode: slang -*-
_debug_info = 1;

static define purge_file (file, age, print_option)
{
   variable st = stat_file (file);
   if (st == NULL)
     {
	() = fprintf (stderr, "stat %s failed: %s\n", file, errno_string (errno));
	return;
     }
   
   if (st.st_ctime >= age)
     return;
   
   if (print_option)
     {
	() = fprintf (stdout, "%s\n", file);
	return;
     }

   if (-1 == remove (file))
     () = fprintf (stderr, "remove %s failed: %s\n", file, errno_string (errno));
}

static define purge_usage ()
{
   () = fprintf (stderr, "Usage: %s [-n] NUM-DAYS-OLD files...\n", __argv[0]);
   () = fprintf (stderr, "  Files older than NUM-DAYS-OLD be deleted.\n");
   () = fprintf (stderr, "  -n ==> Just print the files to be removed but do not remove them.\n");
   exit (1);
}

static define main (argc, argv)
{
   variable age, i, print_option, file;
   
   if (argc < 3) purge_usage ();
   
   i = 2;
   print_option = 0;
   if (argv[1] == "-n")
     {
	i++;
	print_option = 1;
	if (argc < 4)
	  purge_usage ();
     }

   age = __argv[i-1];
   if (String_Type == _slang_guess_type (age))
     purge_usage ();

   age = _time() - atof(age) * 24 * 3600;
   
   foreach (argv[[i:]])
     {
	file = ();
	purge_file (file, age, print_option);
     }
   exit (0);
}

main (__argc, __argv);