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 .owner = THIS_MODULE, 50 }; 51 52 static int __init init_nls_utf8(void) 53 { 54 int i; 55 for (i=0; i<256; i++) 56 identity[i] = i; 57 58 return register_nls(&table); 59 } 60 61 static void __exit exit_nls_utf8(void) 62 { 63 unregister_nls(&table); 64 } 65 66 module_init(init_nls_utf8) 67 module_exit(exit_nls_utf8) 68 MODULE_LICENSE("Dual BSD/GPL"); 69