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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2009 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 *
* http://www.opensource.org/licenses/cpl1.0.txt *
* (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> *
* *
***********************************************************************/
#include "sfhdr.h"
/* Read a record delineated by a character.
** The record length can be accessed via sfvalue(f).
**
** Written by Kiem-Phong Vo
*/
#if __STD_C
char* sfgetr(Sfio_t *f, int rc, int type)
#else
char* sfgetr(f,rc,type)
Sfio_t* f; /* stream to read from */
int rc; /* record separator */
int type;
#endif
{
ssize_t n, un;
uchar *s, *ends, *us;
int found;
Sfrsrv_t* rsrv;
SFMTXDECL(f);
SFMTXENTER(f, NIL(char*));
if(rc < 0 || (f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0) )
SFMTXRETURN(f, NIL(char*));
SFLOCK(f,0);
/* buffer to be returned */
rsrv = NIL(Sfrsrv_t*);
us = NIL(uchar*);
un = 0;
found = 0;
/* compatibility mode */
type = type < 0 ? SF_LASTR : type == 1 ? SF_STRING : type;
if(type&SF_LASTR) /* return the broken record */
{ if((f->flags&SF_STRING) && (un = f->endb - f->next))
{ us = f->next;
f->next = f->endb;
found = 1;
}
else if((rsrv = f->rsrv) && (un = -rsrv->slen) > 0)
{ us = rsrv->data;
found = 1;
}
goto done;
}
while(!found)
{ /* fill buffer if necessary */
if((n = (ends = f->endb) - (s = f->next)) <= 0)
{ /* for unseekable devices, peek-read 1 record */
f->getr = rc;
f->mode |= SF_RC;
/* fill buffer the conventional way */
if(SFRPEEK(f,s,n) <= 0)
{ us = NIL(uchar*);
goto done;
}
else
{ ends = s+n;
if(f->mode&SF_RC)
{ s = ends[-1] == rc ? ends-1 : ends;
goto do_copy;
}
}
}
#if _lib_memchr
if(!(s = (uchar*)memchr((char*)s,rc,n)))
s = ends;
#else
while(*s != rc)
if((s += 1) == ends)
break;
#endif
do_copy:
if(s < ends) /* found separator */
{ s += 1; /* include the separator */
found = 1;
if(!us &&
(!(type&SF_STRING) || !(f->flags&SF_STRING) ||
((f->flags&SF_STRING) && (f->bits&SF_BOTH) ) ) )
{ /* returning data in buffer */
us = f->next;
un = s - f->next;
f->next = s;
goto done;
}
}
/* amount to be read */
n = s - f->next;
if(!found && (_Sfmaxr > 0 && un+n+1 >= _Sfmaxr || (f->flags&SF_STRING))) /* already exceed limit */
{ us = NIL(uchar*);
goto done;
}
/* get internal buffer */
if(!rsrv || rsrv->size < un+n+1)
{ if(rsrv)
rsrv->slen = un;
if((rsrv = _sfrsrv(f,un+n+1)) != NIL(Sfrsrv_t*))
us = rsrv->data;
else
{ us = NIL(uchar*);
goto done;
}
}
/* now copy data */
s = us+un;
un += n;
ends = f->next;
f->next += n;
MEMCPY(s,ends,n);
}
done:
_Sfi = f->val = un;
f->getr = 0;
if(found && rc != 0 && (type&SF_STRING) )
{ us[un-1] = '\0';
if(us >= f->data && us < f->endb)
{ f->getr = rc;
f->mode |= SF_GETR;
}
}
/* prepare for a call to get the broken record */
if(rsrv)
rsrv->slen = found ? 0 : -un;
SFOPEN(f,0);
if(us && (type&SF_LOCKR) )
{ f->mode |= SF_PEEK|SF_GETR;
f->endr = f->data;
}
SFMTXRETURN(f, (char*)us);
}
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