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 portably coded double value 25 ** 26 ** Written by Kiem-Phong Vo 27 */ 28 29 #if __STD_C 30 Sfdouble_t sfgetd(Sfio_t* f) 31 #else 32 Sfdouble_t sfgetd(f) 33 Sfio_t* f; 34 #endif 35 { 36 reg uchar *s, *ends, c; 37 reg int p, sign, exp; 38 Sfdouble_t v; 39 40 SFMTXSTART(f,-1.); 41 42 if((sign = sfgetc(f)) < 0 || (exp = (int)sfgetu(f)) < 0) 43 SFMTXRETURN(f, -1.); 44 45 if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0) 46 SFMTXRETURN(f, -1.); 47 48 SFLOCK(f,0); 49 50 v = 0.; 51 for(;;) 52 { /* fast read for data */ 53 if(SFRPEEK(f,s,p) <= 0) 54 { f->flags |= SF_ERROR; 55 v = -1.; 56 goto done; 57 } 58 59 for(ends = s+p; s < ends; ) 60 { c = *s++; 61 v += SFUVALUE(c); 62 v = ldexpl(v,-SF_PRECIS); 63 if(!(c&SF_MORE)) 64 { f->next = s; 65 goto done; 66 } 67 } 68 f->next = s; 69 } 70 71 done: 72 v = ldexpl(v,(sign&02) ? -exp : exp); 73 if(sign&01) 74 v = -v; 75 76 SFOPEN(f,0); 77 SFMTXRETURN(f, v); 78 } 79