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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 (boundlen <= 0)
 19                 return -ENAMETOOLONG;
 20 
 21         n = utf32_to_utf8(uni, out, boundlen);
 22         if (n < 0) {
 23                 *out = '?';
 24                 return -EINVAL;
 25         }
 26         return n;
 27 }
 28 
 29 static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
 30 {
 31         int n;
 32         unicode_t u;
 33 
 34         n = utf8_to_utf32(rawstring, boundlen, &u);
 35         if (n < 0 || u > MAX_WCHAR_T) {
 36                 *uni = 0x003f;  /* ? */
 37                 return -EINVAL;
 38         }
 39         *uni = (wchar_t) u;
 40         return n;
 41 }
 42 
 43 static struct nls_table table = {
 44         .charset        = "utf8",
 45         .uni2char       = uni2char,
 46         .char2uni       = char2uni,
 47         .charset2lower  = identity,     /* no conversion */
 48         .charset2upper  = identity,
 49 };
 50 
 51 static int __init init_nls_utf8(void)
 52 {
 53         int i;
 54         for (i=0; i<256; i++)
 55                 identity[i] = i;
 56 
 57         return register_nls(&table);
 58 }
 59 
 60 static void __exit exit_nls_utf8(void)
 61 {
 62         unregister_nls(&table);
 63 }
 64 
 65 module_init(init_nls_utf8)
 66 module_exit(exit_nls_utf8)
 67 MODULE_LICENSE("Dual BSD/GPL");
 68 

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