text: /* vi: set sw=4 ts=4: */
  /*
   * mode_string implementation for busybox
   *
   * Copyright (C) 2003  Manuel Novoa III  <mjn3@codepoet.org>
   *
   * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
   */
  
  /* Aug 13, 2003
   * Fix a bug reported by junkio@cox.net involving the mode_chars index.
   */
  
  
  #include <assert.h>
  #include <sys/stat.h>
  
  #include "libbb.h"
  
  #if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \
   || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \
   || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \
   || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 )
  #error permission bitflag value assumption(s) violated!
  #endif
  
  #if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \
   || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \
   || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \
   || ( S_IFIFO != 0010000 )
  #warning mode type bitflag value assumption(s) violated! falling back to larger version
  
  #if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777
  #undef mode_t
  #define mode_t unsigned short
  #endif
  
  static const mode_t mode_flags[] = {
  	S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID,
  	S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID,
  	S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX
  };
  
  /* The static const char arrays below are duplicated for the two cases
   * because moving them ahead of the mode_flags declaration cause a text
   * size increase with the gcc version I'm using. */
  
  /* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
   * and 'B' types don't appear to be available on linux.  So I removed them. */
  static const char type_chars[16] ALIGN1 = "?pc?d?b?-?l?s???";
  /*                                  0123456789abcdef */
  static const char mode_chars[7] ALIGN1 = "rwxSTst";
  
  const char *bb_mode_string(mode_t mode)
  {
  	static char buf[12];
  	char *p = buf;
  
  	int i, j, k;
  
  	*p = type_chars[ (mode >> 12) & 0xf ];
  	i = 0;
  	do {
  		j = k = 0;
  		do {
  			*++p = '-';
  			if (mode & mode_flags[i+j]) {
  				*p = mode_chars[j];
  				k = j;
  			}
  		} while (++j < 3);
  		if (mode & mode_flags[i+j]) {
  			*p = mode_chars[3 + (k & 2) + ((i&8) >> 3)];
  		}
  		i += 4;
  	} while (i < 12);
  
  	/* Note: We don't bother with nul termination because bss initialization
  	 * should have taken care of that for us.  If the user scribbled in buf
  	 * memory, they deserve whatever happens.  But we'll at least assert. */
  	assert(buf[10] == 0);
  
  	return buf;
  }
  
  #else
  
  /* The previous version used "0pcCd?bB-?l?s???".  However, the '0', 'C',
   * and 'B' types don't appear to be available on linux.  So I removed them. */
  static const char type_chars[16] = "?pc?d?b?-?l?s???";
  /*                                  0123456789abcdef */
  static const char mode_chars[7] = "rwxSTst";
  
  const char *bb_mode_string(mode_t mode)
  {
  	static char buf[12];
  	char *p = buf;
  
  	int i, j, k, m;
  
  	*p = type_chars[ (mode >> 12) & 0xf ];
  	i = 0;
  	m = 0400;
  	do {
  		j = k = 0;
  		do {
  			*++p = '-';
  			if (mode & m) {
  				*p = mode_chars[j];
  				k = j;
  			}
  			m >>= 1;
  		} while (++j < 3);
  		++i;
  		if (mode & (010000 >> i)) {
  			*p = mode_chars[3 + (k & 2) + (i == 3)];
  		}
  	} while (i < 3);
  
  	/* Note: We don't bother with nul termination because bss initialization
  	 * should have taken care of that for us.  If the user scribbled in buf
  	 * memory, they deserve whatever happens.  But we'll at least assert. */
  	assert(buf[10] == 0);
  
  	return buf;
  }
  
  #endif
  