name.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:4k
- /*
- * linux/fs/hpfs/name.c
- *
- * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
- *
- * operations with filenames
- */
- #include <linux/string.h>
- #include "hpfs_fn.h"
- char *text_postfix[]={
- ".ASM", ".BAS", ".BAT", ".C", ".CC", ".CFG", ".CMD", ".CON", ".CPP", ".DEF",
- ".DOC", ".DPR", ".ERX", ".H", ".HPP", ".HTM", ".HTML", ".JAVA", ".LOG", ".PAS",
- ".RC", ".TEX", ".TXT", ".Y", ""};
- char *text_prefix[]={
- "AUTOEXEC.", "CHANGES", "COPYING", "CONFIG.", "CREDITS", "FAQ", "FILE_ID.DIZ",
- "MAKEFILE", "READ.ME", "README", "TERMCAP", ""};
- void hpfs_decide_conv(struct inode *inode, unsigned char *name, unsigned len)
- {
- int i;
- if (inode->i_hpfs_conv != CONV_AUTO) return;
- for (i = 0; *text_postfix[i]; i++) {
- int l = strlen(text_postfix[i]);
- if (l <= len)
- if (!hpfs_compare_names(inode->i_sb, text_postfix[i], l, name + len - l, l, 0))
- goto text;
- }
- for (i = 0; *text_prefix[i]; i++) {
- int l = strlen(text_prefix[i]);
- if (l <= len)
- if (!hpfs_compare_names(inode->i_sb, text_prefix[i], l, name, l, 0))
- goto text;
- }
- inode->i_hpfs_conv = CONV_BINARY;
- return;
- text:
- inode->i_hpfs_conv = CONV_TEXT;
- return;
- }
- static inline int not_allowed_char(unsigned char c)
- {
- return c<' ' || c=='"' || c=='*' || c=='/' || c==':' || c=='<' ||
- c=='>' || c=='?' || c=='\' || c=='|';
- }
- static inline int no_dos_char(unsigned char c)
- { /* Characters that are allowed in HPFS but not in DOS */
- return c=='+' || c==',' || c==';' || c=='=' || c=='[' || c==']';
- }
- static inline unsigned char upcase(unsigned char *dir, unsigned char a)
- {
- if (a<128 || a==255) return a>='a' && a<='z' ? a - 0x20 : a;
- if (!dir) return a;
- return dir[a-128];
- }
- unsigned char hpfs_upcase(unsigned char *dir, unsigned char a)
- {
- return upcase(dir, a);
- }
- static inline unsigned char locase(unsigned char *dir, unsigned char a)
- {
- if (a<128 || a==255) return a>='A' && a<='Z' ? a + 0x20 : a;
- if (!dir) return a;
- return dir[a];
- }
- int hpfs_chk_name(unsigned char *name, unsigned *len)
- {
- int i;
- if (*len > 254) return -ENAMETOOLONG;
- hpfs_adjust_length(name, len);
- if (!*len) return -EINVAL;
- for (i = 0; i < *len; i++) if (not_allowed_char(name[i])) return -EINVAL;
- if (*len == 1) if (name[0] == '.') return -EINVAL;
- if (*len == 2) if (name[0] == '.' && name[1] == '.') return -EINVAL;
- return 0;
- }
- char *hpfs_translate_name(struct super_block *s, unsigned char *from,
- unsigned len, int lc, int lng)
- {
- char *to;
- int i;
- if (s->s_hpfs_chk >= 2) if (hpfs_is_name_long(from, len) != lng) {
- printk("HPFS: Long name flag mismatch - name ");
- for (i=0; i<len; i++) printk("%c", from[i]);
- printk(" misidentified as %s.n", lng ? "short" : "long");
- printk("HPFS: It's nothing serious. It could happen because of bug in OS/2.nHPFS: Set checks=normal to disable this message.n");
- }
- if (!lc) return from;
- if (!(to = kmalloc(len, GFP_KERNEL))) {
- printk("HPFS: can't allocate memory for name conversion buffern");
- return from;
- }
- for (i = 0; i < len; i++) to[i] = locase(s->s_hpfs_cp_table,from[i]);
- return to;
- }
- int hpfs_compare_names(struct super_block *s, unsigned char *n1, unsigned l1,
- unsigned char *n2, unsigned l2, int last)
- {
- unsigned l = l1 < l2 ? l1 : l2;
- unsigned i;
- if (last) return -1;
- for (i = 0; i < l; i++) {
- unsigned char c1 = upcase(s->s_hpfs_cp_table,n1[i]);
- unsigned char c2 = upcase(s->s_hpfs_cp_table,n2[i]);
- if (c1 < c2) return -1;
- if (c1 > c2) return 1;
- }
- if (l1 < l2) return -1;
- if (l1 > l2) return 1;
- return 0;
- }
- int hpfs_is_name_long(unsigned char *name, unsigned len)
- {
- int i,j;
- for (i = 0; i < len && name[i] != '.'; i++)
- if (no_dos_char(name[i])) return 1;
- if (!i || i > 8) return 1;
- if (i == len) return 0;
- for (j = i + 1; j < len; j++)
- if (name[j] == '.' || no_dos_char(name[i])) return 1;
- return j - i > 4;
- }
- /* OS/2 clears dots and spaces at the end of file name, so we have to */
- void hpfs_adjust_length(unsigned char *name, unsigned *len)
- {
- if (!*len) return;
- if (*len == 1 && name[0] == '.') return;
- if (*len == 2 && name[0] == '.' && name[1] == '.') return;
- while (*len && (name[*len - 1] == '.' || name[*len - 1] == ' '))
- (*len)--;
- }