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https://github.com/edk2-porting/linux-next.git
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74675a5850
This patch (as1239) updates the kernel's treatment of Unicode. The character-set conversion routines are well behind the current state of the Unicode specification: They don't recognize the existence of code points beyond plane 0 or of surrogate pairs in the UTF-16 encoding. The old wchar_t 16-bit type is retained because it's still used in lots of places. This shouldn't cause any new problems; if a conversion now results in an invalid 16-bit code then before it must have yielded an undefined code. Difficult-to-read names like "utf_mbstowcs" are replaced with more transparent names like "utf8s_to_utf16s" and the ordering of the parameters is rationalized (buffer lengths come immediate after the pointers they refer to, and the inputs precede the outputs). Fortunately the low-level conversion routines are used in only a few places; the interfaces to the higher-level uni2char and char2uni methods have been left unchanged. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Acked-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
69 lines
1.2 KiB
C
69 lines
1.2 KiB
C
/*
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* Module for handling utf8 just like any other charset.
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* By Urban Widmark 2000
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/nls.h>
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#include <linux/errno.h>
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static unsigned char identity[256];
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static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
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{
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int n;
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if (boundlen <= 0)
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return -ENAMETOOLONG;
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n = utf32_to_utf8(uni, out, boundlen);
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if (n < 0) {
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*out = '?';
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return -EINVAL;
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}
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return n;
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}
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static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
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{
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int n;
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unicode_t u;
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n = utf8_to_utf32(rawstring, boundlen, &u);
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if (n < 0 || u > MAX_WCHAR_T) {
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*uni = 0x003f; /* ? */
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return -EINVAL;
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}
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*uni = (wchar_t) u;
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return n;
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}
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static struct nls_table table = {
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.charset = "utf8",
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.uni2char = uni2char,
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.char2uni = char2uni,
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.charset2lower = identity, /* no conversion */
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.charset2upper = identity,
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.owner = THIS_MODULE,
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};
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static int __init init_nls_utf8(void)
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{
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int i;
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for (i=0; i<256; i++)
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identity[i] = i;
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return register_nls(&table);
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}
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static void __exit exit_nls_utf8(void)
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{
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unregister_nls(&table);
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}
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module_init(init_nls_utf8)
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module_exit(exit_nls_utf8)
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MODULE_LICENSE("Dual BSD/GPL");
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