1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5 * and is licensed under the * 6 * Common Public License, Version 1.0 * 7 * by AT&T Knowledge Ventures * 8 * * 9 * A copy of the License is available at * 10 * http://www.opensource.org/licenses/cpl1.0.txt * 11 * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12 * * 13 * Information and Software Systems Research * 14 * AT&T Research * 15 * Florham Park NJ * 16 * * 17 * Glenn Fowler <gsf@research.att.com> * 18 * David Korn <dgk@research.att.com> * 19 * Phong Vo <kpv@research.att.com> * 20 * * 21 ***********************************************************************/ 22 #include "sfhdr.h" 23 24 /* Read a long value coded in a portable format. 25 ** 26 ** Written by Kiem-Phong Vo 27 */ 28 29 #if __STD_C 30 Sflong_t sfgetl(reg Sfio_t* f) 31 #else 32 Sflong_t sfgetl(f) 33 reg Sfio_t* f; 34 #endif 35 { 36 Sflong_t v; 37 reg uchar *s, *ends, c; 38 reg int p; 39 40 SFMTXSTART(f,(Sflong_t)(-1)); 41 42 if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0) 43 SFMTXRETURN(f, (Sflong_t)(-1)); 44 SFLOCK(f,0); 45 46 for(v = 0;;) 47 { if(SFRPEEK(f,s,p) <= 0) 48 { f->flags |= SF_ERROR; 49 v = (Sflong_t)(-1); 50 goto done; 51 } 52 for(ends = s+p; s < ends;) 53 { c = *s++; 54 if(c&SF_MORE) 55 v = ((Sfulong_t)v << SF_UBITS) | SFUVALUE(c); 56 else 57 { /* special translation for this byte */ 58 v = ((Sfulong_t)v << SF_SBITS) | SFSVALUE(c); 59 f->next = s; 60 v = (c&SF_SIGN) ? -v-1 : v; 61 goto done; 62 } 63 } 64 f->next = s; 65 } 66 done : 67 SFOPEN(f,0); 68 SFMTXRETURN(f, v); 69 } 70