reclen.c revision 3e14f97f673e8a630f076077de35afdd43dc1587
/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* Phong Vo <kpv@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* return the length of the current record at b, size n, according to f
* -1 returned on error
* 0 returned if more data is required
*/
#include <recfmt.h>
#include <ctype.h>
{
register unsigned char* s = (unsigned char*)b;
register unsigned char* e;
size_t h;
size_t z;
switch (RECTYPE(f))
{
case REC_delimited:
if (e = (unsigned char*)memchr(s, REC_D_DELIMITER(f), n))
return e - s + 1;
return 0;
case REC_fixed:
return REC_F_SIZE(f);
case REC_variable:
h = REC_V_HEADER(f);
if (n < h)
return 0;
z = 0;
s += REC_V_OFFSET(f);
e = s + REC_V_LENGTH(f);
if (REC_V_LITTLE(f))
while (e > s)
z = (z<<8)|*--e;
else
while (s < e)
z = (z<<8)|*s++;
if (!REC_V_INCLUSIVE(f))
z += h;
else if (z < h)
z = h;
return z;
case REC_method:
return -1;
}
return -1;
}