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/* Convert characters in input buffer using conversion descriptor to
output buffer.
Copyright (C) 1997-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <stddef.h> /* for NULL */
#include <errno.h>
#include <iconv.h>
#include <gconv_int.h>
#include <assert.h>
size_t
iconv (iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf,
size_t *outbytesleft)
{
__gconv_t gcd = (__gconv_t) cd;
char *outstart = outbuf ? *outbuf : NULL;
size_t irreversible;
int result;
if (__glibc_unlikely (inbuf == NULL || *inbuf == NULL))
{
if (outbuf == NULL || *outbuf == NULL)
result = __gconv (gcd, NULL, NULL, NULL, NULL, &irreversible);
else
result = __gconv (gcd, NULL, NULL, (unsigned char **) outbuf,
(unsigned char *) (outstart + *outbytesleft),
&irreversible);
}
else
{
const char *instart = *inbuf;
result = __gconv (gcd, (const unsigned char **) inbuf,
(const unsigned char *) (*inbuf + *inbytesleft),
(unsigned char **) outbuf,
(unsigned char *) (*outbuf + *outbytesleft),
&irreversible);
*inbytesleft -= *inbuf - instart;
}
if (outstart != NULL)
*outbytesleft -= *outbuf - outstart;
switch (__builtin_expect (result, __GCONV_OK))
{
case __GCONV_ILLEGAL_DESCRIPTOR:
__set_errno (EBADF);
irreversible = (size_t) -1L;
break;
case __GCONV_ILLEGAL_INPUT:
__set_errno (EILSEQ);
irreversible = (size_t) -1L;
break;
case __GCONV_FULL_OUTPUT:
__set_errno (E2BIG);
irreversible = (size_t) -1L;
break;
case __GCONV_INCOMPLETE_INPUT:
__set_errno (EINVAL);
irreversible = (size_t) -1L;
break;
case __GCONV_EMPTY_INPUT:
case __GCONV_OK:
/* Nothing. */
break;
default:
assert (!"Nothing like this should happen");
}
return irreversible;
}
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