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114 lines
3.2 KiB
114 lines
3.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* linux/fs/hpfs/name.c |
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* |
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* Mikulas Patocka ([email protected]), 1998-1999 |
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* |
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* operations with filenames |
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*/ |
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#include "hpfs_fn.h" |
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static inline int not_allowed_char(unsigned char c) |
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{ |
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return c<' ' || c=='"' || c=='*' || c=='/' || c==':' || c=='<' || |
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c=='>' || c=='?' || c=='\\' || c=='|'; |
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} |
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static inline int no_dos_char(unsigned char c) |
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{ /* Characters that are allowed in HPFS but not in DOS */ |
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return c=='+' || c==',' || c==';' || c=='=' || c=='[' || c==']'; |
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} |
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static inline unsigned char upcase(unsigned char *dir, unsigned char a) |
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{ |
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if (a<128 || a==255) return a>='a' && a<='z' ? a - 0x20 : a; |
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if (!dir) return a; |
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return dir[a-128]; |
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} |
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unsigned char hpfs_upcase(unsigned char *dir, unsigned char a) |
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{ |
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return upcase(dir, a); |
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} |
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static inline unsigned char locase(unsigned char *dir, unsigned char a) |
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{ |
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if (a<128 || a==255) return a>='A' && a<='Z' ? a + 0x20 : a; |
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if (!dir) return a; |
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return dir[a]; |
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} |
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int hpfs_chk_name(const unsigned char *name, unsigned *len) |
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{ |
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int i; |
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if (*len > 254) return -ENAMETOOLONG; |
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hpfs_adjust_length(name, len); |
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if (!*len) return -EINVAL; |
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for (i = 0; i < *len; i++) if (not_allowed_char(name[i])) return -EINVAL; |
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if (*len == 1) if (name[0] == '.') return -EINVAL; |
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if (*len == 2) if (name[0] == '.' && name[1] == '.') return -EINVAL; |
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return 0; |
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} |
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unsigned char *hpfs_translate_name(struct super_block *s, unsigned char *from, |
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unsigned len, int lc, int lng) |
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{ |
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unsigned char *to; |
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int i; |
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if (hpfs_sb(s)->sb_chk >= 2) if (hpfs_is_name_long(from, len) != lng) { |
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pr_err("Long name flag mismatch - name "); |
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for (i = 0; i < len; i++) |
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pr_cont("%c", from[i]); |
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pr_cont(" misidentified as %s.\n", lng ? "short" : "long"); |
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pr_err("It's nothing serious. It could happen because of bug in OS/2.\nSet checks=normal to disable this message.\n"); |
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} |
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if (!lc) return from; |
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if (!(to = kmalloc(len, GFP_KERNEL))) { |
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pr_err("can't allocate memory for name conversion buffer\n"); |
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return from; |
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} |
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for (i = 0; i < len; i++) to[i] = locase(hpfs_sb(s)->sb_cp_table,from[i]); |
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return to; |
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} |
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int hpfs_compare_names(struct super_block *s, |
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const unsigned char *n1, unsigned l1, |
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const unsigned char *n2, unsigned l2, int last) |
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{ |
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unsigned l = l1 < l2 ? l1 : l2; |
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unsigned i; |
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if (last) return -1; |
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for (i = 0; i < l; i++) { |
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unsigned char c1 = upcase(hpfs_sb(s)->sb_cp_table,n1[i]); |
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unsigned char c2 = upcase(hpfs_sb(s)->sb_cp_table,n2[i]); |
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if (c1 < c2) return -1; |
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if (c1 > c2) return 1; |
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} |
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if (l1 < l2) return -1; |
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if (l1 > l2) return 1; |
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return 0; |
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} |
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int hpfs_is_name_long(const unsigned char *name, unsigned len) |
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{ |
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int i,j; |
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for (i = 0; i < len && name[i] != '.'; i++) |
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if (no_dos_char(name[i])) return 1; |
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if (!i || i > 8) return 1; |
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if (i == len) return 0; |
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for (j = i + 1; j < len; j++) |
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if (name[j] == '.' || no_dos_char(name[i])) return 1; |
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return j - i > 4; |
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} |
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/* OS/2 clears dots and spaces at the end of file name, so we have to */ |
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void hpfs_adjust_length(const unsigned char *name, unsigned *len) |
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{ |
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if (!*len) return; |
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if (*len == 1 && name[0] == '.') return; |
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if (*len == 2 && name[0] == '.' && name[1] == '.') return; |
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while (*len && (name[*len - 1] == '.' || name[*len - 1] == ' ')) |
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(*len)--; |
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}
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