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fmtperm.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*           Copyright (c) 1985-2007 AT&T Knowledge Ventures            *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                      by AT&T Knowledge Ventures                      *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Bell Laboratories
 *
 * return strperm() expression for perm
 */

#include <ast.h>
#include <ls.h>

char*
fmtperm(register int perm)
{
      register char*    s;
      char*       buf;

      s = buf = fmtbuf(32);

      /*
       * u
       */

      *s++ = 'u';
      *s++ = '=';
      if (perm & S_ISVTX)
            *s++ = 't';
      if (perm & S_ISUID)
            *s++ = 's';
      if (perm & S_IRUSR)
            *s++ = 'r';
      if (perm & S_IWUSR)
            *s++ = 'w';
      if (perm & S_IXUSR)
            *s++ = 'x';
      if ((perm & (S_ISGID|S_IXGRP)) == S_ISGID)
            *s++ = 'l';

      /*
       * g
       */

      *s++ = ',';
      *s++ = 'g';
      *s++ = '=';
      if ((perm & (S_ISGID|S_IXGRP)) == (S_ISGID|S_IXGRP))
            *s++ = 's';
      if (perm & S_IRGRP)
            *s++ = 'r';
      if (perm & S_IWGRP)
            *s++ = 'w';
      if (perm & S_IXGRP)
            *s++ = 'x';

      /*
       * o
       */

      *s++ = ',';
      *s++ = 'o';
      *s++ = '=';
      if (perm & S_IROTH)
            *s++ = 'r';
      if (perm & S_IWOTH)
            *s++ = 'w';
      if (perm & S_IXOTH)
            *s++ = 'x';
      *s = 0;
      return buf;
}

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