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