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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/sfio/sfgetm.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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#include	"sfhdr.h"

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/*	Read an unsigned long value coded portably for a given range.

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**

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**	Written by Kiem-Phong Vo

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*/

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#if __STD_C

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Sfulong_t sfgetm(Sfio_t* f, Sfulong_t m)

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#else

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Sfulong_t sfgetm(f, m)

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Sfio_t*		f;

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Sfulong_t	m;

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#endif

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{

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	Sfulong_t	v;

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	reg uchar	*s, *ends, c;

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	reg int		p;

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	SFMTXDECL(f);

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	SFMTXENTER(f, (Sfulong_t)(-1));

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	if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0)

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		SFMTXRETURN(f, (Sfulong_t)(-1));

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	SFLOCK(f,0);

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	for(v = 0;; )

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	{	if(SFRPEEK(f,s,p) <= 0)

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		{	f->flags |= SF_ERROR;

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			v = (Sfulong_t)(-1);

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			goto done;

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		}

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		for(ends = s+p; s < ends;)

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		{	c = *s++;

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			v = (v << SF_BBITS) | SFBVALUE(c);

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			if((m >>= SF_BBITS) <= 0)

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			{	f->next = s;

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				goto done;

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			}

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		}

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		f->next = s;

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	}

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done:

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	SFOPEN(f,0);

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	SFMTXRETURN(f, v);

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}

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