95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/* Convert characters in input buffer using conversion descriptor to
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output buffer.
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Copyright (C) 1997-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stddef.h> /* for NULL */
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#include <errno.h>
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#include <iconv.h>
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#include <gconv_int.h>
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#include <assert.h>
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size_t
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iconv (iconv_t cd, char **inbuf, size_t *inbytesleft, char **outbuf,
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size_t *outbytesleft)
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{
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__gconv_t gcd = (__gconv_t) cd;
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char *outstart = outbuf ? *outbuf : NULL;
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size_t irreversible;
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int result;
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if (__glibc_unlikely (inbuf == NULL || *inbuf == NULL))
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{
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if (outbuf == NULL || *outbuf == NULL)
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result = __gconv (gcd, NULL, NULL, NULL, NULL, &irreversible);
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else
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result = __gconv (gcd, NULL, NULL, (unsigned char **) outbuf,
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(unsigned char *) (outstart + *outbytesleft),
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&irreversible);
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}
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else
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{
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const char *instart = *inbuf;
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result = __gconv (gcd, (const unsigned char **) inbuf,
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(const unsigned char *) (*inbuf + *inbytesleft),
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(unsigned char **) outbuf,
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(unsigned char *) (*outbuf + *outbytesleft),
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&irreversible);
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*inbytesleft -= *inbuf - instart;
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}
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if (outstart != NULL)
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*outbytesleft -= *outbuf - outstart;
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switch (__builtin_expect (result, __GCONV_OK))
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{
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case __GCONV_ILLEGAL_DESCRIPTOR:
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__set_errno (EBADF);
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irreversible = (size_t) -1L;
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break;
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case __GCONV_ILLEGAL_INPUT:
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__set_errno (EILSEQ);
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irreversible = (size_t) -1L;
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break;
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case __GCONV_FULL_OUTPUT:
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__set_errno (E2BIG);
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irreversible = (size_t) -1L;
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break;
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case __GCONV_INCOMPLETE_INPUT:
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__set_errno (EINVAL);
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irreversible = (size_t) -1L;
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break;
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case __GCONV_EMPTY_INPUT:
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case __GCONV_OK:
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/* Nothing. */
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break;
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default:
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assert (!"Nothing like this should happen");
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}
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return irreversible;
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}
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