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 <linux/string.h>
   10 #include "hpfs_fn.h"
   11 
   12 char *text_postfix[]={
   13 ".ASM", ".BAS", ".BAT", ".C", ".CC", ".CFG", ".CMD", ".CON", ".CPP", ".DEF",
   14 ".DOC", ".DPR", ".ERX", ".H", ".HPP", ".HTM", ".HTML", ".JAVA", ".LOG", ".PAS",
   15 ".RC", ".TEX", ".TXT", ".Y", ""};
   16 
   17 char *text_prefix[]={
   18 "AUTOEXEC.", "CHANGES", "COPYING", "CONFIG.", "CREDITS", "FAQ", "FILE_ID.DIZ",
   19 "MAKEFILE", "READ.ME", "README", "TERMCAP", ""};
   20 
   21 void hpfs_decide_conv(struct inode *inode, unsigned char *name, unsigned len)
   22 {
   23         int i;
   24         if (inode->i_hpfs_conv != CONV_AUTO) return;
   25         for (i = 0; *text_postfix[i]; i++) {
   26                 int l = strlen(text_postfix[i]);
   27                 if (l <= len)
   28                         if (!hpfs_compare_names(inode->i_sb, text_postfix[i], l, name + len - l, l, 0))
   29                                 goto text;
   30         }
   31         for (i = 0; *text_prefix[i]; i++) {
   32                 int l = strlen(text_prefix[i]);
   33                 if (l <= len)
   34                         if (!hpfs_compare_names(inode->i_sb, text_prefix[i], l, name, l, 0))
   35                                 goto text;
   36         }
   37         inode->i_hpfs_conv = CONV_BINARY;
   38         return;
   39         text:
   40         inode->i_hpfs_conv = CONV_TEXT;
   41         return;
   42 }
   43 
   44 static inline int not_allowed_char(unsigned char c)
   45 {
   46         return c<' ' || c=='"' || c=='*' || c=='/' || c==':' || c=='<' ||
   47               c=='>' || c=='?' || c=='\\' || c=='|';
   48 }
   49 
   50 static inline int no_dos_char(unsigned char c)
   51 {       /* Characters that are allowed in HPFS but not in DOS */
   52         return c=='+' || c==',' || c==';' || c=='=' || c=='[' || c==']';
   53 }
   54 
   55 static inline unsigned char upcase(unsigned char *dir, unsigned char a)
   56 {
   57         if (a<128 || a==255) return a>='a' && a<='z' ? a - 0x20 : a;
   58         if (!dir) return a;
   59         return dir[a-128];
   60 }
   61 
   62 unsigned char hpfs_upcase(unsigned char *dir, unsigned char a)
   63 {
   64         return upcase(dir, a);
   65 }
   66 
   67 static inline unsigned char locase(unsigned char *dir, unsigned char a)
   68 {
   69         if (a<128 || a==255) return a>='A' && a<='Z' ? a + 0x20 : a;
   70         if (!dir) return a;
   71         return dir[a];
   72 }
   73 
   74 int hpfs_chk_name(unsigned char *name, unsigned *len)
   75 {
   76         int i;
   77         if (*len > 254) return -ENAMETOOLONG;
   78         hpfs_adjust_length(name, len);
   79         if (!*len) return -EINVAL;
   80         for (i = 0; i < *len; i++) if (not_allowed_char(name[i])) return -EINVAL;
   81         if (*len == 1) if (name[0] == '.') return -EINVAL;
   82         if (*len == 2) if (name[0] == '.' && name[1] == '.') return -EINVAL;
   83         return 0;
   84 }
   85 
   86 char *hpfs_translate_name(struct super_block *s, unsigned char *from,
   87                           unsigned len, int lc, int lng)
   88 {
   89         char *to;
   90         int i;
   91         if (s->s_hpfs_chk >= 2) if (hpfs_is_name_long(from, len) != lng) {
   92                 printk("HPFS: Long name flag mismatch - name ");
   93                 for (i=0; i<len; i++) printk("%c", from[i]);
   94                 printk(" misidentified as %s.\n", lng ? "short" : "long");
   95                 printk("HPFS: It's nothing serious. It could happen because of bug in OS/2.\nHPFS: Set checks=normal to disable this message.\n");
   96         }
   97         if (!lc) return from;
   98         if (!(to = kmalloc(len, GFP_KERNEL))) {
   99                 printk("HPFS: can't allocate memory for name conversion buffer\n");
  100                 return from;
  101         }
  102         for (i = 0; i < len; i++) to[i] = locase(s->s_hpfs_cp_table,from[i]);
  103         return to;
  104 }
  105 
  106 int hpfs_compare_names(struct super_block *s, unsigned char *n1, unsigned l1,
  107                        unsigned char *n2, unsigned l2, int last)
  108 {
  109         unsigned l = l1 < l2 ? l1 : l2;
  110         unsigned i;
  111         if (last) return -1;
  112         for (i = 0; i < l; i++) {
  113                 unsigned char c1 = upcase(s->s_hpfs_cp_table,n1[i]);
  114                 unsigned char c2 = upcase(s->s_hpfs_cp_table,n2[i]);
  115                 if (c1 < c2) return -1;
  116                 if (c1 > c2) return 1;
  117         }
  118         if (l1 < l2) return -1;
  119         if (l1 > l2) return 1;
  120         return 0;
  121 }
  122 
  123 int hpfs_is_name_long(unsigned char *name, unsigned len)
  124 {
  125         int i,j;
  126         for (i = 0; i < len && name[i] != '.'; i++)
  127                 if (no_dos_char(name[i])) return 1;
  128         if (!i || i > 8) return 1;
  129         if (i == len) return 0;
  130         for (j = i + 1; j < len; j++)
  131                 if (name[j] == '.' || no_dos_char(name[i])) return 1;
  132         return j - i > 4;
  133 }
  134 
  135 /* OS/2 clears dots and spaces at the end of file name, so we have to */
  136 
  137 void hpfs_adjust_length(unsigned char *name, unsigned *len)
  138 {
  139         if (!*len) return;
  140         if (*len == 1 && name[0] == '.') return;
  141         if (*len == 2 && name[0] == '.' && name[1] == '.') return;
  142         while (*len && (name[*len - 1] == '.' || name[*len - 1] == ' '))
  143                 (*len)--;
  144 }

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

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