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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/misc/reclen.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * return the length of the current record at b, size n, according to f

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 * -1 returned on error

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 *  0 returned if more data is required

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 */

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#include <recfmt.h>

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#include <ctype.h>

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ssize_t

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reclen(Recfmt_t f, const void* b, size_t n)

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{

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	register unsigned char*	s = (unsigned char*)b;

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	register unsigned char*	e;

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	size_t			h;

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	size_t			z;

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	switch (RECTYPE(f))

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	{

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	case REC_delimited:

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		if (e = (unsigned char*)memchr(s, REC_D_DELIMITER(f), n))

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			return e - s + 1;

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		return 0;

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	case REC_fixed:

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		return REC_F_SIZE(f);

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	case REC_variable:

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		h = REC_V_HEADER(f);

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		if (n < h)

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			return 0;

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		z = 0;

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		s += REC_V_OFFSET(f);

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		e = s + REC_V_LENGTH(f);

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		if (REC_V_LITTLE(f))

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			while (e > s)

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				z = (z<<8)|*--e;

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		else

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			while (s < e)

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				z = (z<<8)|*s++;

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		if (!REC_V_INCLUSIVE(f))

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			z += h;

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		else if (z < h)

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			z = h;

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		return z;

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	case REC_method:

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		return -1;

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	}

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	return -1;

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}

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