1/*********************************************************************** 2* * 3* This software is part of the ast package * 4* Copyright (c) 1985-2011 AT&T Intellectual Property * 5* and is licensed under the * 6* Common Public License, Version 1.0 * 7* by AT&T Intellectual Property * 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 an unsigned long value coded portably for a given range. 25** 26** Written by Kiem-Phong Vo 27*/ 28 29#if __STD_C 30Sfulong_t sfgetm(Sfio_t* f, Sfulong_t m) 31#else 32Sfulong_t sfgetm(f, m) 33Sfio_t* f; 34Sfulong_t m; 35#endif 36{ 37 Sfulong_t v; 38 reg uchar *s, *ends, c; 39 reg int p; 40 SFMTXDECL(f); 41 42 SFMTXENTER(f, (Sfulong_t)(-1)); 43 44 if(f->mode != SF_READ && _sfmode(f,SF_READ,0) < 0) 45 SFMTXRETURN(f, (Sfulong_t)(-1)); 46 47 SFLOCK(f,0); 48 49 for(v = 0;; ) 50 { if(SFRPEEK(f,s,p) <= 0) 51 { f->flags |= SF_ERROR; 52 v = (Sfulong_t)(-1); 53 goto done; 54 } 55 for(ends = s+p; s < ends;) 56 { c = *s++; 57 v = (v << SF_BBITS) | SFBVALUE(c); 58 if((m >>= SF_BBITS) <= 0) 59 { f->next = s; 60 goto done; 61 } 62 } 63 f->next = s; 64 } 65done: 66 SFOPEN(f,0); 67 SFMTXRETURN(f, v); 68} 69