LXR linux/fs/hpfs/name.c

   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
  11static inline int not_allowed_char(unsigned char c)
  12{
  13        return c<' ' || c=='"' || c=='*' || c=='/' || c==':' || c=='<' ||
  14              c=='>' || c=='?' || c=='\\' || c=='|';
  15}
  16
  17static 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
  22static 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
  29unsigned char hpfs_upcase(unsigned char *dir, unsigned char a)
  30{
  31        return upcase(dir, a);
  32}
  33
  34static 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
  41int 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
  53unsigned 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
  73int 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
  91int 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
 105void 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}
 113