c99.h
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/*
* Copyright (C) 1999-2002, 2016 Free Software Foundation, Inc.
* This file is part of the GNU LIBICONV Library.
*
* The GNU LIBICONV Library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* The GNU LIBICONV Library is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
* If not, see <http://www.gnu.org/licenses/>.
*/
/*
* C99
* This is ASCII with \uXXXX and \UXXXXXXXX escape sequences, denoting Unicode
* characters. See ISO/IEC 9899:1999, section 6.4.3.
* The treatment of control characters in the range U+0080..U+009F is not
* specified; we pass them through unmodified.
*/
static int
c99_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n)
{
unsigned char c;
ucs4_t wc;
int i;
c = s[0];
if (c < 0xa0) {
if (c != '\\') {
*pwc = c;
return 1;
}
if (n < 2)
return RET_TOOFEW(0);
c = s[1];
if (c == 'u') {
wc = 0;
for (i = 2; i < 6; i++) {
if (n <= i)
return RET_TOOFEW(0);
c = s[i];
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'A' && c <= 'Z')
c -= 'A'-10;
else if (c >= 'a' && c <= 'z')
c -= 'a'-10;
else
goto simply_backslash;
wc |= (ucs4_t) c << (4 * (5-i));
}
if ((wc >= 0x00a0 && !(wc >= 0xd800 && wc < 0xe000))
|| wc == 0x0024 || wc == 0x0040 || wc == 0x0060) {
*pwc = wc;
return 6;
}
} else if (c == 'U') {
wc = 0;
for (i = 2; i < 10; i++) {
if (n <= i)
return RET_TOOFEW(0);
c = s[i];
if (c >= '0' && c <= '9')
c -= '0';
else if (c >= 'A' && c <= 'Z')
c -= 'A'-10;
else if (c >= 'a' && c <= 'z')
c -= 'a'-10;
else
goto simply_backslash;
wc |= (ucs4_t) c << (4 * (9-i));
}
if ((wc >= 0x00a0 && !(wc >= 0xd800 && wc < 0xe000))
|| wc == 0x0024 || wc == 0x0040 || wc == 0x0060) {
*pwc = wc;
return 10;
}
} else
goto simply_backslash;
}
return RET_ILSEQ;
simply_backslash:
*pwc = '\\';
return 1;
}
static int
c99_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n)
{
if (wc < 0xa0) {
*r = wc;
return 1;
} else {
int result;
unsigned char u;
if (wc < 0x10000) {
result = 6;
u = 'u';
} else {
result = 10;
u = 'U';
}
if (n >= result) {
int count;
r[0] = '\\';
r[1] = u;
r += 2;
for (count = result-3; count >= 0; count--) {
unsigned int i = (wc >> (4*count)) & 0x0f;
*r++ = (i < 10 ? '0'+i : 'a'-10+i);
}
return result;
} else
return RET_TOOSMALL;
}
}