1 /* 2 * mode_string implementation for busybox 3 * 4 * Copyright (C) 2003 Manuel Novoa III <mjn3@codepoet.org> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 /* Aug 13, 2003 10 * Fix a bug reported by junkio@cox.net involving the mode_chars index. 11 */ 12 13 14 #include <common.h> 15 #include <linux/stat.h> 16 17 #if ( S_ISUID != 04000 ) || ( S_ISGID != 02000 ) || ( S_ISVTX != 01000 ) \ 18 || ( S_IRUSR != 00400 ) || ( S_IWUSR != 00200 ) || ( S_IXUSR != 00100 ) \ 19 || ( S_IRGRP != 00040 ) || ( S_IWGRP != 00020 ) || ( S_IXGRP != 00010 ) \ 20 || ( S_IROTH != 00004 ) || ( S_IWOTH != 00002 ) || ( S_IXOTH != 00001 ) 21 #error permission bitflag value assumption(s) violated! 22 #endif 23 24 #if ( S_IFSOCK!= 0140000 ) || ( S_IFLNK != 0120000 ) \ 25 || ( S_IFREG != 0100000 ) || ( S_IFBLK != 0060000 ) \ 26 || ( S_IFDIR != 0040000 ) || ( S_IFCHR != 0020000 ) \ 27 || ( S_IFIFO != 0010000 ) 28 #warning mode type bitflag value assumption(s) violated! falling back to larger version 29 30 #if (S_IRWXU | S_IRWXG | S_IRWXO | S_ISUID | S_ISGID | S_ISVTX) == 07777 31 #undef mode_t 32 #define mode_t unsigned short 33 #endif 34 35 static const mode_t mode_flags[] = { 36 S_IRUSR, S_IWUSR, S_IXUSR, S_ISUID, 37 S_IRGRP, S_IWGRP, S_IXGRP, S_ISGID, 38 S_IROTH, S_IWOTH, S_IXOTH, S_ISVTX 39 }; 40 41 /* The static const char arrays below are duplicated for the two cases 42 * because moving them ahead of the mode_flags declaration cause a text 43 * size increase with the gcc version I'm using. */ 44 45 /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C', 46 * and 'B' types don't appear to be available on linux. So I removed them. */ 47 static const char type_chars[16] = "?pc?d?b?-?l?s???"; 48 /* 0123456789abcdef */ 49 static const char mode_chars[7] = "rwxSTst"; 50 51 const char *bb_mode_string(int mode) 52 { 53 static char buf[12]; 54 char *p = buf; 55 56 int i, j, k; 57 58 *p = type_chars[ (mode >> 12) & 0xf ]; 59 i = 0; 60 do { 61 j = k = 0; 62 do { 63 *++p = '-'; 64 if (mode & mode_flags[i+j]) { 65 *p = mode_chars[j]; 66 k = j; 67 } 68 } while (++j < 3); 69 if (mode & mode_flags[i+j]) { 70 *p = mode_chars[3 + (k & 2) + ((i&8) >> 3)]; 71 } 72 i += 4; 73 } while (i < 12); 74 75 /* Note: We don't bother with nul termination because bss initialization 76 * should have taken care of that for us. If the user scribbled in buf 77 * memory, they deserve whatever happens. But we'll at least assert. */ 78 if (buf[10] != 0) return NULL; 79 80 return buf; 81 } 82 83 #else 84 85 /* The previous version used "0pcCd?bB-?l?s???". However, the '0', 'C', 86 * and 'B' types don't appear to be available on linux. So I removed them. */ 87 static const char type_chars[16] = "?pc?d?b?-?l?s???"; 88 /* 0123456789abcdef */ 89 static const char mode_chars[7] = "rwxSTst"; 90 91 const char *bb_mode_string(int mode) 92 { 93 static char buf[12]; 94 char *p = buf; 95 96 int i, j, k, m; 97 98 *p = type_chars[ (mode >> 12) & 0xf ]; 99 i = 0; 100 m = 0400; 101 do { 102 j = k = 0; 103 do { 104 *++p = '-'; 105 if (mode & m) { 106 *p = mode_chars[j]; 107 k = j; 108 } 109 m >>= 1; 110 } while (++j < 3); 111 ++i; 112 if (mode & (010000 >> i)) { 113 *p = mode_chars[3 + (k & 2) + (i == 3)]; 114 } 115 } while (i < 3); 116 117 /* Note: We don't bother with nul termination because bss initialization 118 * should have taken care of that for us. If the user scribbled in buf 119 * memory, they deserve whatever happens. But we'll at least assert. */ 120 if (buf[10] != 0) return NULL; 121 122 return buf; 123 } 124 125 #endif 126