nls_base.c

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/*
 * linux/fs/nls_base.c
 *
 * Native language support--charsets and unicode translations.
 * By Gordon Chaffee 1996, 1997
 *
 * Unicode based case conversion 1999 by Wolfram Pienkoss
 *
 */
 
#include <linux/module.h>
#include <linux/string.h>
#include <linux/config.h>
#include <linux/nls.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#ifdef CONFIG_KMOD
#include <linux/kmod.h>
#endif
#include <linux/spinlock.h>
 
struct nls_table *tables;
spinlock_t nls_lock;
 
/*
 * Sample implementation from Unicode home page.
 * http://www.stonehand.com/unicode/standard/fss-utf.html
 */
struct utf8_table {
    int     cmask;
    int     cval;
    int     shift;
    long    lmask;
    long    lval;
};
 
static struct utf8_table utf8_table[] =
{
    {0x80,  0x00,   0*6,    0x7F,           0,         /* 1 byte sequence */},
    {0xE0,  0xC0,   1*6,    0x7FF,          0x80,      /* 2 byte sequence */},
    {0xF0,  0xE0,   2*6,    0xFFFF,         0x800,     /* 3 byte sequence */},
    {0xF8,  0xF0,   3*6,    0x1FFFFF,       0x10000,   /* 4 byte sequence */},
    {0xFC,  0xF8,   4*6,    0x3FFFFFF,      0x200000,  /* 5 byte sequence */},
    {0xFE,  0xFC,   5*6,    0x7FFFFFFF,     0x4000000, /* 6 byte sequence */},
    {0,                            /* end of table    */}
};
 
int
utf8_mbtowc(wchar_t *p, const __u8 *s, int n)
{
    long l;
    int c0, c, nc;
    struct utf8_table *t;
 
    nc = 0;
    c0 = *s;
    l = c0;
    for (t = utf8_table; t->cmask; t++) {
        nc++;
        if ((c0 & t->cmask) == t->cval) {
            l &= t->lmask;
            if (l < t->lval)
                return -1;
            *p = (wchar_t)l;
            return nc;
        }
        if (n <= nc)
            return -1;
        s++;
        c = (*s ^ 0x80) & 0xFF;
        if (c & 0xC0)
            return -1;
        l = (l << 6) | c;
    }
    return -1;
}
 
int
utf8_mbstowcs(wchar_t *pwcs, const __u8 *s, int n)
{
    __u16 *op;
    const __u8 *ip;
    int size;
 
    op = pwcs;
    ip = s;
    while (*ip && n > 0) {
        if (*ip & 0x80) {
            size = utf8_mbtowc(op, ip, n);
            if (size == -1) {
                /* Ignore character and move on */
                ip++;
                n--;
            } else {
                op++;
                ip += size;
                n -= size;
            }
        } else {
            *op++ = *ip++;
            n--;
        }
    }
    return (int)(op - pwcs);
}
 
int
utf8_wctomb(__u8 *s, wchar_t wc, int maxlen)
{
    long l;
    int c, nc;
    struct utf8_table *t;
 
    if (s == 0)
        return 0;
 
    l = wc;
    nc = 0;
    for (t = utf8_table; t->cmask && maxlen; t++, maxlen--) {
        nc++;
        if (l <= t->lmask) {
            c = t->shift;
            *s = (__u8)(t->cval | (l >> c));
            while (c > 0) {
                c -= 6;
                s++;
                *s = 0x80 | (__u8)((l >> c) & 0x3F);
            }
            return nc;
        }
    }
    return -1;
}
 
int
utf8_wcstombs(__u8 *s, const wchar_t *pwcs, int maxlen)
{
    const __u16 *ip;
    __u8 *op;
    int size;
 
    op = s;
    ip = pwcs;
    while (*ip && maxlen > 0) {
        if (*ip > 0x7f) {
            size = utf8_wctomb(op, *ip, maxlen);
            if (size == -1) {
                /* Ignore character and move on */
                maxlen--;
            } else {
                op += size;
                maxlen -= size;
            }
        } else {
            *op++ = (__u8) *ip;
        }
        ip++;
    }
    return (int)(op - s);
}
 
int register_nls(struct nls_table * nls)
{
    struct nls_table ** tmp = &tables;
 
    if (!nls)
        return -EINVAL;
    if (nls->next)
        return -EBUSY;
 
    spin_lock(&nls_lock);
    while (*tmp) {
        if (nls == *tmp) {
            spin_unlock(&nls_lock);
            return -EBUSY;
        }
        tmp = &(*tmp)->next;
    }
    nls->next = tables;
    tables = nls;
    spin_unlock(&nls_lock);
    return 0;
}
 
int unregister_nls(struct nls_table * nls)
{
    struct nls_table ** tmp = &tables;
 
    spin_lock(&nls_lock);
    while (*tmp) {
        if (nls == *tmp) {
            *tmp = nls->next;
            spin_unlock(&nls_lock);
            return 0;
        }
        tmp = &(*tmp)->next;
    }
    spin_unlock(&nls_lock);
    return -EINVAL;
}
 
static struct nls_table *find_nls(char *charset)
{
    struct nls_table *nls;
    spin_lock(&nls_lock);
    for (nls = tables; nls; nls = nls->next) {
        if (!strcmp(nls->charset, charset))
            break;
        if (nls->alias && !strcmp(nls->alias, charset))
            break;
    }
    if (nls && !try_module_get(nls->owner))
        nls = NULL;
    spin_unlock(&nls_lock);
    return nls;
}
 
struct nls_table *load_nls(char *charset)
{
    struct nls_table *nls;
#ifdef CONFIG_KMOD
    int ret;
#endif
 
    nls = find_nls(charset);
    if (nls)
        return nls;
 
#ifdef CONFIG_KMOD
    ret = request_module("nls_%s", charset);
    if (ret != 0) {
        printk("Unable to load NLS charset %s\n", charset);
        return NULL;
    }
    nls = find_nls(charset);
#endif
    return nls;
}
 
void unload_nls(struct nls_table *nls)
{
    module_put(nls->owner);
}
 
wchar_t charset2uni[256] = {
    /* 0x00*/
    0x0000, 0x0001, 0x0002, 0x0003,
    0x0004, 0x0005, 0x0006, 0x0007,
    0x0008, 0x0009, 0x000a, 0x000b,
    0x000c, 0x000d, 0x000e, 0x000f,
    /* 0x10*/
    0x0010, 0x0011, 0x0012, 0x0013,
    0x0014, 0x0015, 0x0016, 0x0017,
    0x0018, 0x0019, 0x001a, 0x001b,
    0x001c, 0x001d, 0x001e, 0x001f,
    /* 0x20*/
    0x0020, 0x0021, 0x0022, 0x0023,
    0x0024, 0x0025, 0x0026, 0x0027,
    0x0028, 0x0029, 0x002a, 0x002b,
    0x002c, 0x002d, 0x002e, 0x002f,
    /* 0x30*/
    0x0030, 0x0031, 0x0032, 0x0033,
    0x0034, 0x0035, 0x0036, 0x0037,
    0x0038, 0x0039, 0x003a, 0x003b,
    0x003c, 0x003d, 0x003e, 0x003f,
    /* 0x40*/
    0x0040, 0x0041, 0x0042, 0x0043,
    0x0044, 0x0045, 0x0046, 0x0047,
    0x0048, 0x0049, 0x004a, 0x004b,
    0x004c, 0x004d, 0x004e, 0x004f,
    /* 0x50*/
    0x0050, 0x0051, 0x0052, 0x0053,
    0x0054, 0x0055, 0x0056, 0x0057,
    0x0058, 0x0059, 0x005a, 0x005b,
    0x005c, 0x005d, 0x005e, 0x005f,
    /* 0x60*/
    0x0060, 0x0061, 0x0062, 0x0063,
    0x0064, 0x0065, 0x0066, 0x0067,
    0x0068, 0x0069, 0x006a, 0x006b,
    0x006c, 0x006d, 0x006e, 0x006f,
    /* 0x70*/
    0x0070, 0x0071, 0x0072, 0x0073,
    0x0074, 0x0075, 0x0076, 0x0077,
    0x0078, 0x0079, 0x007a, 0x007b,
    0x007c, 0x007d, 0x007e, 0x007f,
    /* 0x80*/
    0x0080, 0x0081, 0x0082, 0x0083,
    0x0084, 0x0085, 0x0086, 0x0087,
    0x0088, 0x0089, 0x008a, 0x008b,
    0x008c, 0x008d, 0x008e, 0x008f,
    /* 0x90*/
    0x0090, 0x0091, 0x0092, 0x0093,
    0x0094, 0x0095, 0x0096, 0x0097,
    0x0098, 0x0099, 0x009a, 0x009b,
    0x009c, 0x009d, 0x009e, 0x009f,
    /* 0xa0*/
    0x00a0, 0x00a1, 0x00a2, 0x00a3,
    0x00a4, 0x00a5, 0x00a6, 0x00a7,
    0x00a8, 0x00a9, 0x00aa, 0x00ab,
    0x00ac, 0x00ad, 0x00ae, 0x00af,
    /* 0xb0*/
    0x00b0, 0x00b1, 0x00b2, 0x00b3,
    0x00b4, 0x00b5, 0x00b6, 0x00b7,
    0x00b8, 0x00b9, 0x00ba, 0x00bb,
    0x00bc, 0x00bd, 0x00be, 0x00bf,
    /* 0xc0*/
    0x00c0, 0x00c1, 0x00c2, 0x00c3,
    0x00c4, 0x00c5, 0x00c6, 0x00c7,
    0x00c8, 0x00c9, 0x00ca, 0x00cb,
    0x00cc, 0x00cd, 0x00ce, 0x00cf,
    /* 0xd0*/
    0x00d0, 0x00d1, 0x00d2, 0x00d3,
    0x00d4, 0x00d5, 0x00d6, 0x00d7,
    0x00d8, 0x00d9, 0x00da, 0x00db,
    0x00dc, 0x00dd, 0x00de, 0x00df,
    /* 0xe0*/
    0x00e0, 0x00e1, 0x00e2, 0x00e3,
    0x00e4, 0x00e5, 0x00e6, 0x00e7,
    0x00e8, 0x00e9, 0x00ea, 0x00eb,
    0x00ec, 0x00ed, 0x00ee, 0x00ef,
    /* 0xf0*/
    0x00f0, 0x00f1, 0x00f2, 0x00f3,
    0x00f4, 0x00f5, 0x00f6, 0x00f7,
    0x00f8, 0x00f9, 0x00fa, 0x00fb,
    0x00fc, 0x00fd, 0x00fe, 0x00ff,
};
 
static unsigned char page00[256] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
    0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
    0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
    0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
    0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
    0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
    0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
 
    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
    0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
    0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
    0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
    0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
    0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
    0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
    0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
    0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
    0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
    0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
    0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
    0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
};
 
static unsigned char *page_uni2charset[256] = {
    page00
};
 
static unsigned char charset2lower[256] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
    0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
    0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
    0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x40-0x47 */
    0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x48-0x4f */
    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x50-0x57 */
    0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
    0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, /* 0x60-0x67 */
    0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, /* 0x68-0x6f */
    0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, /* 0x70-0x77 */
    0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
 
    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
    0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
    0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
    0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
    0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
    0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
    0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
    0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
    0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
    0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
    0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
    0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
    0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
};
 
static unsigned char charset2upper[256] = {
    0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, /* 0x00-0x07 */
    0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, /* 0x08-0x0f */
    0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, /* 0x10-0x17 */
    0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, /* 0x18-0x1f */
    0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, /* 0x20-0x27 */
    0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, /* 0x28-0x2f */
    0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, /* 0x30-0x37 */
    0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, /* 0x38-0x3f */
    0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x40-0x47 */
    0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x48-0x4f */
    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x50-0x57 */
    0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, /* 0x58-0x5f */
    0x60, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, /* 0x60-0x67 */
    0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, /* 0x68-0x6f */
    0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, /* 0x70-0x77 */
    0x58, 0x59, 0x5a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, /* 0x78-0x7f */
 
    0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, /* 0x80-0x87 */
    0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, /* 0x88-0x8f */
    0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, /* 0x90-0x97 */
    0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, /* 0x98-0x9f */
    0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, /* 0xa0-0xa7 */
    0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, /* 0xa8-0xaf */
    0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, /* 0xb0-0xb7 */
    0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, /* 0xb8-0xbf */
    0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, /* 0xc0-0xc7 */
    0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, /* 0xc8-0xcf */
    0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, /* 0xd0-0xd7 */
    0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, /* 0xd8-0xdf */
    0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, /* 0xe0-0xe7 */
    0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, /* 0xe8-0xef */
    0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, /* 0xf0-0xf7 */
    0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, /* 0xf8-0xff */
};
 
 
static int uni2char(wchar_t uni, unsigned char *out, int boundlen)
{
    unsigned char *uni2charset;
    unsigned char cl = uni & 0x00ff;
    unsigned char ch = (uni & 0xff00) >> 8;
 
    if (boundlen <= 0)
        return -ENAMETOOLONG;
 
    uni2charset = page_uni2charset[ch];
    if (uni2charset && uni2charset[cl])
        out[0] = uni2charset[cl];
    else
        return -EINVAL;
    return 1;
}
 
static int char2uni(const unsigned char *rawstring, int boundlen, wchar_t *uni)
{
    *uni = charset2uni[*rawstring];
    if (*uni == 0x0000)
        return -EINVAL;
    return 1;
}
 
#if 0 // Masked by Matt
 
static struct nls_table default_table = {
    /* .charset */ "default",
    /* .alias */   0,
    /* .uni2char */ uni2char,
    /* .char2uni */ char2uni,
    /* .charset2lower */ charset2lower,
    /* .charset2upper */ charset2upper,
    /* .owner */ 0
};
 
/* Returns a simple default translation table */
struct nls_table *load_nls_default(void)
{
    struct nls_table *default_nls;
 
    default_nls = load_nls(CONFIG_NLS_DEFAULT);
    if (default_nls != NULL)
        return default_nls;
    else
        return &default_table;
}
 
#endif
 
EXPORT_SYMBOL(register_nls);
EXPORT_SYMBOL(unregister_nls);
EXPORT_SYMBOL(unload_nls);
EXPORT_SYMBOL(load_nls);
EXPORT_SYMBOL(load_nls_default);
EXPORT_SYMBOL(utf8_mbtowc);
EXPORT_SYMBOL(utf8_mbstowcs);
EXPORT_SYMBOL(utf8_wctomb);
EXPORT_SYMBOL(utf8_wcstombs);
 
MODULE_LICENSE("Dual BSD/GPL");