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glibc/iconv/loop.c

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/* Conversion loop frame work.
Copyright (C) 1998, 1999 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
The GNU C 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 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* This file provides a frame for the reader loop in all conversion modules.
The actual code must (of course) be provided in the actual module source
code but certain actions can be written down generically, with some
customization options which are these:
MIN_NEEDED_INPUT minimal number of input bytes needed for the next
conversion.
MIN_NEEDED_OUTPUT minimal number of bytes produced by the next round
of conversion.
MAX_NEEDED_INPUT you guess it, this is the maximal number of input
bytes needed. It defaults to MIN_NEEDED_INPUT
MAX_NEEDED_OUTPUT likewise for output bytes.
LOOPFCT name of the function created. If not specified
the name is `loop' but this prevents the use
of multiple functions in the same file.
COUNT_CONVERTED optional macro which is used to count the actual
number of characters converted. For some conversion
it is easy to compute the value afterwards, but for
others explicit counting is cheaper.
BODY this is supposed to expand to the body of the loop.
The user must provide this.
EXTRA_LOOP_DECLS extra arguments passed from converion loop call.
INIT_PARAMS code to define and initialize variables from params.
UPDATE_PARAMS code to store result in params.
*/
#include <gconv.h>
#include <wchar.h>
#include <sys/param.h> /* For MIN. */
#define __need_size_t
#include <stddef.h>
/* We need at least one byte for the next round. */
#ifndef MIN_NEEDED_INPUT
# error "MIN_NEEDED_INPUT definition missing"
#endif
/* Let's see how many bytes we produce. */
#ifndef MAX_NEEDED_INPUT
# define MAX_NEEDED_INPUT MIN_NEEDED_INPUT
#endif
/* We produce at least one byte in the next round. */
#ifndef MIN_NEEDED_OUTPUT
# error "MIN_NEEDED_OUTPUT definition missing"
#endif
/* Let's see how many bytes we produce. */
#ifndef MAX_NEEDED_OUTPUT
# define MAX_NEEDED_OUTPUT MIN_NEEDED_OUTPUT
#endif
/* Default name for the function. */
#ifndef LOOPFCT
# define LOOPFCT loop
#endif
/* Make sure we have a loop body. */
#ifndef BODY
# error "Definition of BODY missing for function" LOOPFCT
#endif
/* We can calculate the number of converted characters easily if one
of the character sets has a fixed width. */
#ifndef COUNT_CONVERTED
# if MIN_NEEDED_INPUT == MAX_NEEDED_INPUT
# if MIN_NEEDED_OUTPUT == MAX_NEEDED_OUTPUT
/* Decide whether one of the charsets has size 1. */
# if MIN_NEEDED_INPUT == 1
# define COUNT_CONVERTED (inptr - *inptrp)
# elif MIN_NEEDED_OUTPUT == 1
# define COUNT_CONVERTED (outptr - *outptrp)
# else
/* Else we should see whether one of the two numbers is a power of 2. */
# define COUNT_CONVERTED \
((MIN_NEEDED_INPUT & (-MIN_NEEDED_INPUT)) == MIN_NEEDED_INPUT \
? (inptr - *inptrp) : (outptr - *outptrp))
# endif
# else
# define COUNT_CONVERTED ((inptr - *inptrp) / MIN_NEEDED_INPUT)
# endif
# elif MIN_NEEDED_OUTPUT == MAX_NEEDED_OUTPUT
# define COUNT_CONVERTED ((outptr - *outptrp) / MIN_NEEDED_OUTPUT)
# endif
#endif
/* If no arguments have to passed to the loop function define the macro
as empty. */
#ifndef EXTRA_LOOP_DECLS
# define EXTRA_LOOP_DECLS
#endif
/* The function returns the status, as defined in gconv.h. */
static inline int
LOOPFCT (const unsigned char **inptrp, const unsigned char *inend,
unsigned char **outptrp, unsigned char *outend, mbstate_t *state,
void *data, size_t *converted EXTRA_LOOP_DECLS)
{
int result = __GCONV_OK;
const unsigned char *inptr = *inptrp;
unsigned char *outptr = *outptrp;
#ifndef COUNT_CONVERTED
size_t done = 0;
#endif
/* We run one loop where we avoid checks for underflow/overflow of the
buffers to speed up the conversion a bit. */
size_t min_in_rounds = (inend - inptr) / MAX_NEEDED_INPUT;
size_t min_out_rounds = (outend - outptr) / MAX_NEEDED_OUTPUT;
size_t min_rounds = MIN (min_in_rounds, min_out_rounds);
#ifdef INIT_PARAMS
INIT_PARAMS;
#endif
#undef NEED_LENGTH_TEST
#define NEED_LENGTH_TEST 0
while (min_rounds-- > 0)
{
/* Here comes the body the user provides. It can stop with RESULT
set to GCONV_INCOMPLETE_INPUT (if the size of the input characters
vary in size), GCONV_ILLEGAL_INPUT, or GCONV_FULL_OUTPUT (if the
output characters vary in size. */
BODY
/* If necessary count the successful conversion. */
#ifndef COUNT_CONVERTED
++done;
#endif
}
if (result == __GCONV_OK)
{
#if MIN_NEEDED_INPUT == MAX_NEEDED_INPUT \
&& MIN_NEEDED_OUTPUT == MAX_NEEDED_OUTPUT
/* We don't need to start another loop since we were able to determine
the maximal number of characters to copy in advance. What remains
to be determined is the status. */
if (inptr == inend)
/* No more input. */
result = __GCONV_EMPTY_INPUT;
else if ((MIN_NEEDED_OUTPUT != 1 && outptr + MIN_NEEDED_OUTPUT > outend)
|| (MIN_NEEDED_OUTPUT == 1 && outptr >= outend))
/* Overflow in the output buffer. */
result = __GCONV_FULL_OUTPUT;
else
/* We have something left in the input buffer. */
result = __GCONV_INCOMPLETE_INPUT;
#else
result = __GCONV_EMPTY_INPUT;
# undef NEED_LENGTH_TEST
# define NEED_LENGTH_TEST 1
while (inptr != inend)
{
/* `if' cases for MIN_NEEDED_OUTPUT ==/!= 1 is made to help the
compiler generating better code. It will optimized away
since MIN_NEEDED_OUTPUT is always a constant. */
if ((MIN_NEEDED_OUTPUT != 1 && outptr + MIN_NEEDED_OUTPUT > outend)
|| (MIN_NEEDED_OUTPUT == 1 && outptr >= outend))
{
/* Overflow in the output buffer. */
result = __GCONV_FULL_OUTPUT;
break;
}
if (MIN_NEEDED_INPUT > 1 && inptr + MIN_NEEDED_INPUT > inend)
{
/* We don't have enough input for another complete input
character. */
result = __GCONV_INCOMPLETE_INPUT;
break;
}
/* Here comes the body the user provides. It can stop with
RESULT set to GCONV_INCOMPLETE_INPUT (if the size of the
input characters vary in size), GCONV_ILLEGAL_INPUT, or
GCONV_FULL_OUTPUT (if the output characters vary in size). */
BODY
/* If necessary count the successful conversion. */
# ifndef COUNT_CONVERTED
++done;
# endif
}
#endif /* Input and output charset are not both fixed width. */
}
/* Add the number of characters we actually converted. */
#ifdef COUNT_CONVERTED
*converted += COUNT_CONVERTED;
#else
*converted += done;
#endif
/* Update the pointers pointed to by the parameters. */
*inptrp = inptr;
*outptrp = outptr;
#ifdef UPDATE_PARAMS
UPDATE_PARAMS;
#endif
return result;
}
/* We remove the macro definitions so that we can include this file again
for the definition of another function. */
#undef MIN_NEEDED_INPUT
#undef MAX_NEEDED_INPUT
#undef MIN_NEEDED_OUTPUT
#undef MAX_NEEDED_OUTPUT
#undef LOOPFCT
#undef COUNT_CONVERTED
#undef BODY
#undef LOOPFCT
#undef EXTRA_LOOP_DECLS
#undef INIT_PARAMS
#undef UPDATE_PARAMS
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