cde/programs/dtksh/ksh93/src/lib/libast/sfio/sfgetl.c

   1 /*
   2  * CDE - Common Desktop Environment
   3  *
   4  * Copyright (c) 1993-2012, The Open Group. All rights reserved.
   5  *
   6  * These libraries and programs are free software; you can
   7  * redistribute them and/or modify them under the terms of the GNU
   8  * Lesser General Public License as published by the Free Software
   9  * Foundation; either version 2 of the License, or (at your option)
  10  * any later version.
  11  *
  12  * These libraries and programs are distributed in the hope that
  13  * they will be useful, but WITHOUT ANY WARRANTY; without even the
  14  * implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
  15  * PURPOSE. See the GNU Lesser General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with these librararies and programs; if not, write
  20  * to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
  21  * Floor, Boston, MA 02110-1301 USA
  22  */
  23 /* $XConsortium: sfgetl.c /main/3 1995/11/01 18:29:40 rswiston $ */
  24 /***************************************************************
  25 *                                                              *
  26 *                      AT&T - PROPRIETARY                      *
  27 *                                                              *
  28 *         THIS IS PROPRIETARY SOURCE CODE LICENSED BY          *
  29 *                          AT&T CORP.                          *
  30 *                                                              *
  31 *                Copyright (c) 1995 AT&T Corp.                 *
  32 *                     All Rights Reserved                      *
  33 *                                                              *
  34 *           This software is licensed by AT&T Corp.            *
  35 *       under the terms and conditions of the license in       *
  36 *       http://www.research.att.com/orgs/ssr/book/reuse        *
  37 *                                                              *
  38 *               This software was created by the               *
  39 *           Software Engineering Research Department           *
  40 *                    AT&T Bell Laboratories                    *
  41 *                                                              *
  42 *               For further information contact                *
  43 *                     gsf@research.att.com                     *
  44 *                                                              *
  45 ***************************************************************/
  46 #include        "sfhdr.h"
  47
  48 /*      Read a long value coded in a portable format.
  49 **
  50 **      Written by Kiem-Phong Vo (06/27/90)
  51 */
  52
  53 #if __STD_C
  54 long _sfgetl(reg Sfio_t* f)
  55 #else
  56 long _sfgetl(f)
  57 reg Sfio_t      *f;
  58 #endif
  59 {
  60         reg uchar       *s, *ends, c;
  61         reg int         p;
  62         reg long        v;
  63
  64         if(!(_Sfi&SF_MORE))     /* must be a small negative number */
  65                 return -SFSVALUE(_Sfi)-1;
  66
  67         SFLOCK(f,0);
  68         v = SFUVALUE(_Sfi);
  69         for(;;)
  70         {
  71                 if(SFRPEEK(f,s,p) <= 0)
  72                 {       f->flags |= SF_ERROR;
  73                         v = -1L;
  74                         goto done;
  75                 }
  76                 for(ends = s+p; s < ends;)
  77                 {
  78                         c = *s++;
  79                         if(c&SF_MORE)
  80                                 v = ((ulong)v << SF_UBITS) | SFUVALUE(c);
  81                         else
  82                         {       /* special translation for this byte */
  83                                 v = ((ulong)v << SF_SBITS) | SFSVALUE(c);
  84                                 f->next = s;
  85                                 v = (c&SF_SIGN) ? -v-1 : v;
  86                                 goto done;
  87                         }
  88                 }
  89                 f->next = s;
  90         }
  91 done :
  92         SFOPEN(f,0);
  93         return v;
  94 }