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 #if defined(CONFIG_CMD_REISER) 29 #include <linux/stat.h> 30 31 #if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \ 32 || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \ 33 || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \ 34 || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 ) 35 #error permission bitflag value assumption(s) violated! 36 #endif 37 38 #if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \ 39 || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \ 40 || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \ 41 || ( S_IFIFO != 0010000 ) 42 #warning mode type bitflag value assumption(s) violated! falling back to larger version 43 44 #if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777 45 #undef mode_t 46 #define mode_t unsigned short 47 #endif 48 49 static const mode_t mode_flags[] = { 50 S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID, 51 S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID, 52 S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX 53 }; 54 55 /* The static const char arrays below are duplicated for the two cases 56 * because moving them ahead of the mode_flags declaration cause a text 57 * size increase with the gcc version I'm using. */ 58 59 /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C', 60 * and 'B' types don't appear to be available on linux. So I removed them. */ 61 static const char type_chars[16] = "?pc?d?b?-?l?s???"; 62 /* 0123456789abcdef */ 63 static const char mode_chars[7] = "rwxSTst"; 64 65 const char *bb_mode_string(int mode) 66 { 67 static char buf[12]; 68 char *p = buf; 69 70 int i, j, k; 71 72 *p = type_chars[ (mode >> 12) & 0xf ]; 73 i = 0; 74 do { 75 j = k = 0; 76 do { 77 *++p = '-'; 78 if (mode & mode_flags[i+j]) { 79 *p = mode_chars[j]; 80 k = j; 81 } 82 } while (++j < 3); 83 if (mode & mode_flags[i+j]) { 84 *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)]; 85 } 86 i += 4; 87 } while (i < 12); 88 89 /* Note: We don't bother with nul termination because bss initialization 90 * should have taken care of that for us. If the user scribbled in buf 91 * memory, they deserve whatever happens. But we'll at least assert. */ 92 if (buf[10] != 0) return NULL; 93 94 return buf; 95 } 96 97 #else 98 99 /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C', 100 * and 'B' types don't appear to be available on linux. So I removed them. */ 101 static const char type_chars[16] = "?pc?d?b?-?l?s???"; 102 /* 0123456789abcdef */ 103 static const char mode_chars[7] = "rwxSTst"; 104 105 const char *bb_mode_string(int mode) 106 { 107 static char buf[12]; 108 char *p = buf; 109 110 int i, j, k, m; 111 112 *p = type_chars[ (mode >> 12) & 0xf ]; 113 i = 0; 114 m = 0400; 115 do { 116 j = k = 0; 117 do { 118 *++p = '-'; 119 if (mode & m) { 120 *p = mode_chars[j]; 121 k = j; 122 } 123 m >>= 1; 124 } while (++j < 3); 125 ++i; 126 if (mode & (010000 >> i)) { 127 *p = mode_chars[3 + (k & 2) + (i == 3)]; 128 } 129 } while (i < 3); 130 131 /* Note: We don't bother with nul termination because bss initialization 132 * should have taken care of that for us. If the user scribbled in buf 133 * memory, they deserve whatever happens. But we'll at least assert. */ 134 if (buf[10] != 0) return NULL; 135 136 return buf; 137 } 138 139 #endif 140 141 #endif 142