Initial commit

fs/hpfs/name.c

@@ -0,0 +1,112 @@
+/*
+ *  linux/fs/hpfs/name.c
+ *
+ *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
+ *
+ *  operations with filenames
+ */
+
+#include "hpfs_fn.h"
+
+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(const 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;
+}
+
+unsigned char *hpfs_translate_name(struct super_block *s, unsigned char *from,
+			  unsigned len, int lc, int lng)
+{
+	unsigned char *to;
+	int i;
+	if (hpfs_sb(s)->sb_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 buffer\n");
+		return from;
+	}
+	for (i = 0; i < len; i++) to[i] = locase(hpfs_sb(s)->sb_cp_table,from[i]);
+	return to;
+}
+
+int hpfs_compare_names(struct super_block *s,
+		       const unsigned char *n1, unsigned l1,
+		       const 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(hpfs_sb(s)->sb_cp_table,n1[i]);
+		unsigned char c2 = upcase(hpfs_sb(s)->sb_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(const 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(const 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)--;
+}