1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/fs/hpfs/name.c 4 * 5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 6 * 7 * operations with filenames 8 */ 9 10 #include "hpfs_fn.h" 11 12 static inline int not_allowed_char(unsigned char c) 13 { 14 return c<' ' || c=='"' || c=='*' || c=='/' || c==':' || c=='<' || 15 c=='>' || c=='?' || c=='\\' || c=='|'; 16 } 17 18 static inline int no_dos_char(unsigned char c) 19 { /* Characters that are allowed in HPFS but not in DOS */ 20 return c=='+' || c==',' || c==';' || c=='=' || c=='[' || c==']'; 21 } 22 23 static inline unsigned char upcase(unsigned char *dir, unsigned char a) 24 { 25 if (a<128 || a==255) return a>='a' && a<='z' ? a - 0x20 : a; 26 if (!dir) return a; 27 return dir[a-128]; 28 } 29 30 unsigned char hpfs_upcase(unsigned char *dir, unsigned char a) 31 { 32 return upcase(dir, a); 33 } 34 35 static inline unsigned char locase(unsigned char *dir, unsigned char a) 36 { 37 if (a<128 || a==255) return a>='A' && a<='Z' ? a + 0x20 : a; 38 if (!dir) return a; 39 return dir[a]; 40 } 41 42 int hpfs_chk_name(const unsigned char *name, unsigned *len) 43 { 44 int i; 45 if (*len > 254) return -ENAMETOOLONG; 46 hpfs_adjust_length(name, len); 47 if (!*len) return -EINVAL; 48 for (i = 0; i < *len; i++) if (not_allowed_char(name[i])) return -EINVAL; 49 if (*len == 1) if (name[0] == '.') return -EINVAL; 50 if (*len == 2) if (name[0] == '.' && name[1] == '.') return -EINVAL; 51 return 0; 52 } 53 54 unsigned char *hpfs_translate_name(struct super_block *s, unsigned char *from, 55 unsigned len, int lc, int lng) 56 { 57 unsigned char *to; 58 int i; 59 if (hpfs_sb(s)->sb_chk >= 2) if (hpfs_is_name_long(from, len) != lng) { 60 pr_err("Long name flag mismatch - name "); 61 for (i = 0; i < len; i++) 62 pr_cont("%c", from[i]); 63 pr_cont(" misidentified as %s.\n", lng ? "short" : "long"); 64 pr_err("It's nothing serious. It could happen because of bug in OS/2.\nSet checks=normal to disable this message.\n"); 65 } 66 if (!lc) return from; 67 if (!(to = kmalloc(len, GFP_KERNEL))) { 68 pr_err("can't allocate memory for name conversion buffer\n"); 69 return from; 70 } 71 for (i = 0; i < len; i++) to[i] = locase(hpfs_sb(s)->sb_cp_table,from[i]); 72 return to; 73 } 74 75 int hpfs_compare_names(struct super_block *s, 76 const unsigned char *n1, unsigned l1, 77 const unsigned char *n2, unsigned l2, int last) 78 { 79 unsigned l = l1 < l2 ? l1 : l2; 80 unsigned i; 81 if (last) return -1; 82 for (i = 0; i < l; i++) { 83 unsigned char c1 = upcase(hpfs_sb(s)->sb_cp_table,n1[i]); 84 unsigned char c2 = upcase(hpfs_sb(s)->sb_cp_table,n2[i]); 85 if (c1 < c2) return -1; 86 if (c1 > c2) return 1; 87 } 88 if (l1 < l2) return -1; 89 if (l1 > l2) return 1; 90 return 0; 91 } 92 93 int hpfs_is_name_long(const unsigned char *name, unsigned len) 94 { 95 int i,j; 96 for (i = 0; i < len && name[i] != '.'; i++) 97 if (no_dos_char(name[i])) return 1; 98 if (!i || i > 8) return 1; 99 if (i == len) return 0; 100 for (j = i + 1; j < len; j++) 101 if (name[j] == '.' || no_dos_char(name[i])) return 1; 102 return j - i > 4; 103 } 104 105 /* OS/2 clears dots and spaces at the end of file name, so we have to */ 106 107 void hpfs_adjust_length(const unsigned char *name, unsigned *len) 108 { 109 if (!*len) return; 110 if (*len == 1 && name[0] == '.') return; 111 if (*len == 2 && name[0] == '.' && name[1] == '.') return; 112 while (*len && (name[*len - 1] == '.' || name[*len - 1] == ' ')) 113 (*len)--; 114 } 115