Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  2)  * Module for handling utf8 just like any other charset.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  3)  * By Urban Widmark 2000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  4)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  5) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  6) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  7) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  8) #include <linux/string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  9) #include <linux/nls.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) #include <linux/errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) static unsigned char identity[256];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) 	int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) 	if (boundlen <= 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) 		return -ENAMETOOLONG;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) 	n = utf32_to_utf8(uni, out, boundlen);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) 	if (n < 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) 		*out = '?';
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) 	return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) 	int n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) 	unicode_t u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) 	n = utf8_to_utf32(rawstring, boundlen, &u);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) 	if (n < 0 || u > MAX_WCHAR_T) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) 		*uni = 0x003f;	/* ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) 		return -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) 	*uni = (wchar_t) u;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) 	return n;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) static struct nls_table table = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) 	.charset	= "utf8",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) 	.uni2char	= uni2char,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) 	.char2uni	= char2uni,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) 	.charset2lower	= identity,	/* no conversion */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) 	.charset2upper	= identity,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) static int __init init_nls_utf8(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) 	int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) 	for (i=0; i<256; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) 		identity[i] = i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57)         return register_nls(&table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) static void __exit exit_nls_utf8(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62)         unregister_nls(&table);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) module_init(init_nls_utf8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) module_exit(exit_nls_utf8)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) MODULE_LICENSE("Dual BSD/GPL");