name.c

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    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                 printk("HPFS: Long name flag mismatch - name ");
   60                 for (i=0; i<len; i++) printk("%c", from[i]);
   61                 printk(" misidentified as %s.\n", lng ? "short" : "long");
   62                 printk("HPFS: It's nothing serious. It could happen because of bug in OS/2.\nHPFS: Set checks=normal to disable this message.\n");
   63         }
   64         if (!lc) return from;
   65         if (!(to = kmalloc(len, GFP_KERNEL))) {
   66                 printk("HPFS: can't allocate memory for name conversion buffer\n");
   67                 return from;
   68         }
   69         for (i = 0; i < len; i++) to[i] = locase(hpfs_sb(s)->sb_cp_table,from[i]);
   70         return to;
   71 }
   72 
   73 int hpfs_compare_names(struct super_block *s,
   74                        const unsigned char *n1, unsigned l1,
   75                        const unsigned char *n2, unsigned l2, int last)
   76 {
   77         unsigned l = l1 < l2 ? l1 : l2;
   78         unsigned i;
   79         if (last) return -1;
   80         for (i = 0; i < l; i++) {
   81                 unsigned char c1 = upcase(hpfs_sb(s)->sb_cp_table,n1[i]);
   82                 unsigned char c2 = upcase(hpfs_sb(s)->sb_cp_table,n2[i]);
   83                 if (c1 < c2) return -1;
   84                 if (c1 > c2) return 1;
   85         }
   86         if (l1 < l2) return -1;
   87         if (l1 > l2) return 1;
   88         return 0;
   89 }
   90 
   91 int hpfs_is_name_long(const unsigned char *name, unsigned len)
   92 {
   93         int i,j;
   94         for (i = 0; i < len && name[i] != '.'; i++)
   95                 if (no_dos_char(name[i])) return 1;
   96         if (!i || i > 8) return 1;
   97         if (i == len) return 0;
   98         for (j = i + 1; j < len; j++)
   99                 if (name[j] == '.' || no_dos_char(name[i])) return 1;
  100         return j - i > 4;
  101 }
  102 
  103 /* OS/2 clears dots and spaces at the end of file name, so we have to */
  104 
  105 void hpfs_adjust_length(const unsigned char *name, unsigned *len)
  106 {
  107         if (!*len) return;
  108         if (*len == 1 && name[0] == '.') return;
  109         if (*len == 2 && name[0] == '.' && name[1] == '.') return;
  110         while (*len && (name[*len - 1] == '.' || name[*len - 1] == ' '))
  111                 (*len)--;
  112 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/hpfs/name.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/hpfs/name.c