178 lines
4.8 KiB
C
178 lines
4.8 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these librararies and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/* $XConsortium: revlib.c /main/3 1995/11/01 19:07:43 rswiston $ */
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/***************************************************************
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* *
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* AT&T - PROPRIETARY *
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* *
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* THIS IS PROPRIETARY SOURCE CODE LICENSED BY *
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* AT&T CORP. *
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* *
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* Copyright (c) 1995 AT&T Corp. *
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* All Rights Reserved *
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* *
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* This software is licensed by AT&T Corp. *
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* under the terms and conditions of the license in *
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* http://www.research.att.com/orgs/ssr/book/reuse *
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* *
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* This software was created by the *
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* Software Engineering Research Department *
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* AT&T Bell Laboratories *
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* *
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* For further information contact *
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* gsf@research.att.com *
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* *
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***************************************************************/
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/* : : generated by proto : : */
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#if !defined(__PROTO__)
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#if defined(__STDC__) || defined(__cplusplus) || defined(_proto) || defined(c_plusplus)
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#if defined(__cplusplus)
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#define __MANGLE__ "C"
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#else
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#define __MANGLE__
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#endif
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#define __STDARG__
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#define __PROTO__(x) x
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#define __OTORP__(x)
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#define __PARAM__(n,o) n
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#if !defined(__STDC__) && !defined(__cplusplus)
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#if !defined(c_plusplus)
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#define const
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#endif
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#define signed
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#define void int
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#define volatile
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#define __V_ char
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#else
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#define __V_ void
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#endif
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#else
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#define __PROTO__(x) ()
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#define __OTORP__(x) x
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#define __PARAM__(n,o) o
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#define __MANGLE__
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#define __V_ char
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#define const
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#define signed
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#define void int
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#define volatile
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#endif
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#if defined(__cplusplus) || defined(c_plusplus)
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#define __VARARG__ ...
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#else
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#define __VARARG__
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#endif
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#if defined(__STDARG__)
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#define __VA_START__(p,a) va_start(p,a)
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#else
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#define __VA_START__(p,a) va_start(p)
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#endif
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#endif
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#include <cmdlib.h>
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#define BUFSIZE SF_BUFSIZE
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#define rounddown(n,size) (((n)-1)&~((size)-1))
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/*
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* copy the lines starting at offset <start> from in <in> to <out>
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* in reverse order
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*/
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int rev_line __PARAM__((Sfio_t *in, Sfio_t *out, off_t start), (in, out, start)) __OTORP__(Sfio_t *in; Sfio_t *out; off_t start;){
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register char *cp, *cpold;
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register int n, nleft=0;
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char buff[BUFSIZE];
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off_t offset;
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if(sfseek(in,(off_t)0,SEEK_CUR) < 0)
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{
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Sfio_t *tmp = sftmp(4*SF_BUFSIZE);
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if(!tmp)
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return(-1);
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if(start>0)
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sfmove(in, (Sfio_t*)0, (long)start, -1);
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if(sfmove(in, tmp, SF_UNBOUND, -1) < 0)
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return(-1);
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in = tmp;
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start=0;
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}
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if((offset = sfseek(in,(off_t)0,SEEK_END)) <= start)
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return(0);
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offset = rounddown(offset,BUFSIZE);
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while(1)
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{
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n = BUFSIZE;
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if(offset < start)
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{
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n -= (start-offset);
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offset = start;
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}
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sfseek(in, offset, SEEK_SET);
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if((n=sfread(in, buff, n)) <=0)
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break;
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cp = buff+n;
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n = *buff;
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*buff = '\n';
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while(1)
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{
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cpold = cp;
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if(nleft==0)
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cp--;
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if(cp==buff)
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{
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nleft= 1;
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break;
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}
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while(*--cp != '\n');
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if(cp==buff && n!='\n')
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{
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*cp = n;
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nleft += cpold-cp;
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break;
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}
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else
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cp++;
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if(sfwrite(out,cp,cpold-cp) < 0)
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return(-1);
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if(nleft)
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{
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if(nleft==1)
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sfputc(out,'\n');
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else if(sfmove(in,out,nleft,-1) < 0)
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return(-1);
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nleft = 0;
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}
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}
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if(offset <= start)
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break;
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offset -= BUFSIZE;
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}
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if(nleft)
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{
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sfseek(in, start, SEEK_SET);
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if(sfmove(in,out,nleft,-1) < 0)
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return(-1);
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}
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return(0);
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}
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