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Linux/fs/nls/nls_utf8.c

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  1 /*
  2  * Module for handling utf8 just like any other charset.
  3  * By Urban Widmark 2000
  4  */
  5 
  6 #include <linux/module.h>
  7 #include <linux/kernel.h>
  8 #include <linux/string.h>
  9 #include <linux/nls.h>
 10 #include <linux/errno.h>
 11 
 12 static unsigned char identity[256];
 13 
 14 static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
 15 {
 16         int n;
 17 
 18         if ( (n = utf8_wctomb(out, uni, boundlen)) == -1) {
 19                 *out = '?';
 20                 return -EINVAL;
 21         }
 22         return n;
 23 }
 24 
 25 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
 26 {
 27         int n;
 28 
 29         if ( (n = utf8_mbtowc(uni, rawstring, boundlen)) == -1) {
 30                 *uni = 0x003f;  /* ? */
 31                 n = -EINVAL;
 32         }
 33         return n;
 34 }
 35 
 36 static struct nls_table table = {
 37         "utf8",
 38         uni2char,
 39         char2uni,
 40         identity,       /* no conversion */
 41         identity,
 42         THIS_MODULE,
 43 };
 44 
 45 static int __init init_nls_utf8(void)
 46 {
 47         int i;
 48         for (i=0; i<256; i++)
 49                 identity[i] = i;
 50 
 51         return register_nls(&table);
 52 }
 53 
 54 static void __exit exit_nls_utf8(void)
 55 {
 56         unregister_nls(&table);
 57 }
 58 
 59 module_init(init_nls_utf8)
 60 module_exit(exit_nls_utf8)
 61 MODULE_LICENSE("Dual BSD/GPL");
 62 

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