1 /*********************************************************************** 2 * * 3 * This software is part of the ast package * 4 * Copyright (c) 1985-2008 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 30 Sfulong_t sfgetm(Sfio_t* f, Sfulong_t m) 31 #else 32 Sfulong_t sfgetm(f, m) 33 Sfio_t* f; 34 Sfulong_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 } 65 done: 66 SFOPEN(f,0); 67 SFMTXRETURN(f, v); 68 } 69