1 /* 2 * mode_string implementation for busybox 3 * 4 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 * General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License 17 * along with this program; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22 /* Aug 13, 2003 23 * Fix a bug reported by junkio@cox.net involving the mode_chars index. 24 */ 25 26 27 #include <common.h> 28 #include <linux/stat.h> 29 30 #if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \ 31 || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \ 32 || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \ 33 || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 ) 34 #error permission bitflag value assumption(s) violated! 35 #endif 36 37 #if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \ 38 || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \ 39 || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \ 40 || ( S_IFIFO != 0010000 ) 41 #warning mode type bitflag value assumption(s) violated! falling back to larger version 42 43 #if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777 44 #undef mode_t 45 #define mode_t unsigned short 46 #endif 47 48 static const mode_t mode_flags[] = { 49 S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID, 50 S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID, 51 S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX 52 }; 53 54 /* The static const char arrays below are duplicated for the two cases 55 * because moving them ahead of the mode_flags declaration cause a text 56 * size increase with the gcc version I'm using. */ 57 58 /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C', 59 * and 'B' types don't appear to be available on linux. So I removed them. */ 60 static const char type_chars[16] = "?pc?d?b?-?l?s???"; 61 /* 0123456789abcdef */ 62 static const char mode_chars[7] = "rwxSTst"; 63 64 const char *bb_mode_string(int mode) 65 { 66 static char buf[12]; 67 char *p = buf; 68 69 int i, j, k; 70 71 *p = type_chars[ (mode >> 12) & 0xf ]; 72 i = 0; 73 do { 74 j = k = 0; 75 do { 76 *++p = '-'; 77 if (mode & mode_flags[i+j]) { 78 *p = mode_chars[j]; 79 k = j; 80 } 81 } while (++j < 3); 82 if (mode & mode_flags[i+j]) { 83 *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)]; 84 } 85 i += 4; 86 } while (i < 12); 87 88 /* Note: We don't bother with nul termination because bss initialization 89 * should have taken care of that for us. If the user scribbled in buf 90 * memory, they deserve whatever happens. But we'll at least assert. */ 91 if (buf[10] != 0) return NULL; 92 93 return buf; 94 } 95 96 #else 97 98 /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C', 99 * and 'B' types don't appear to be available on linux. So I removed them. */ 100 static const char type_chars[16] = "?pc?d?b?-?l?s???"; 101 /* 0123456789abcdef */ 102 static const char mode_chars[7] = "rwxSTst"; 103 104 const char *bb_mode_string(int mode) 105 { 106 static char buf[12]; 107 char *p = buf; 108 109 int i, j, k, m; 110 111 *p = type_chars[ (mode >> 12) & 0xf ]; 112 i = 0; 113 m = 0400; 114 do { 115 j = k = 0; 116 do { 117 *++p = '-'; 118 if (mode & m) { 119 *p = mode_chars[j]; 120 k = j; 121 } 122 m >>= 1; 123 } while (++j < 3); 124 ++i; 125 if (mode & (010000 >> i)) { 126 *p = mode_chars[3 + (k & 2) + (i == 3)]; 127 } 128 } while (i < 3); 129 130 /* Note: We don't bother with nul termination because bss initialization 131 * should have taken care of that for us. If the user scribbled in buf 132 * memory, they deserve whatever happens. But we'll at least assert. */ 133 if (buf[10] != 0) return NULL; 134 135 return buf; 136 } 137 138 #endif 139