libbb/mode_string.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * Utility routines.
   4  *
   5  * Copyright (C) many different people.  If you wrote this, please
   6  * acknowledge your work.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful, but
  14  * WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  16  * General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21  * USA
  22  */
  23
  24 #include <stdio.h>
  25 #include "libbb.h"
  26
  27 #define TYPEINDEX(mode) (((mode) >> 12) & 0x0f)
  28 #define TYPECHAR(mode)  ("0pcCd?bB-?l?s???" [TYPEINDEX(mode)])
  29
  30 /* The special bits. If set, display SMODE0/1 instead of MODE0/1 */
  31 static const mode_t SBIT[] = {
  32         0, 0, S_ISUID,
  33         0, 0, S_ISGID,
  34         0, 0, S_ISVTX
  35 };
  36
  37 /* The 9 mode bits to test */
  38 static const mode_t MBIT[] = {
  39         S_IRUSR, S_IWUSR, S_IXUSR,
  40         S_IRGRP, S_IWGRP, S_IXGRP,
  41         S_IROTH, S_IWOTH, S_IXOTH
  42 };
  43
  44 static const char MODE1[] = "rwxrwxrwx";
  45 static const char MODE0[] = "---------";
  46 static const char SMODE1[] = "..s..s..t";
  47 static const char SMODE0[] = "..S..S..T";
  48
  49 /*
  50  * Return the standard ls-like mode string from a file mode.
  51  * This is static and so is overwritten on each call.
  52  */
  53 const char *mode_string(int mode)
  54 {
  55         static char buf[12];
  56
  57         int i;
  58
  59         buf[0] = TYPECHAR(mode);
  60         for (i = 0; i < 9; i++) {
  61                 if (mode & SBIT[i])
  62                         buf[i + 1] = (mode & MBIT[i]) ? SMODE1[i] : SMODE0[i];
  63                 else
  64                         buf[i + 1] = (mode & MBIT[i]) ? MODE1[i] : MODE0[i];
  65         }
  66         return buf;
  67 }
  68
  69 /* END CODE */
  70 /*
  71 Local Variables:
  72 c-file-style: "linux"
  73 c-basic-offset: 4
  74 tab-width: 4
  75 End:
  76 */