1*4887Schin /*********************************************************************** 2*4887Schin * * 3*4887Schin * This software is part of the ast package * 4*4887Schin * Copyright (c) 1985-2007 AT&T Knowledge Ventures * 5*4887Schin * and is licensed under the * 6*4887Schin * Common Public License, Version 1.0 * 7*4887Schin * by AT&T Knowledge Ventures * 8*4887Schin * * 9*4887Schin * A copy of the License is available at * 10*4887Schin * http://www.opensource.org/licenses/cpl1.0.txt * 11*4887Schin * (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) * 12*4887Schin * * 13*4887Schin * Information and Software Systems Research * 14*4887Schin * AT&T Research * 15*4887Schin * Florham Park NJ * 16*4887Schin * * 17*4887Schin * Glenn Fowler <gsf@research.att.com> * 18*4887Schin * David Korn <dgk@research.att.com> * 19*4887Schin * Phong Vo <kpv@research.att.com> * 20*4887Schin * * 21*4887Schin ***********************************************************************/ 22*4887Schin #include "sfhdr.h" 23*4887Schin 24*4887Schin /* Write a buffer out to a file descriptor or 25*4887Schin ** extending a buffer for a SF_STRING stream. 26*4887Schin ** 27*4887Schin ** Written by Kiem-Phong Vo 28*4887Schin */ 29*4887Schin 30*4887Schin #if __STD_C 31*4887Schin int _sfflsbuf(reg Sfio_t* f, reg int c) 32*4887Schin #else 33*4887Schin int _sfflsbuf(f,c) 34*4887Schin reg Sfio_t* f; /* write out the buffered content of this stream */ 35*4887Schin reg int c; /* if c>=0, c is also written out */ 36*4887Schin #endif 37*4887Schin { 38*4887Schin reg ssize_t n, w; 39*4887Schin reg uchar* data; 40*4887Schin uchar outc; 41*4887Schin reg int local, isall; 42*4887Schin int inpc = c; 43*4887Schin 44*4887Schin SFMTXSTART(f,-1); 45*4887Schin 46*4887Schin GETLOCAL(f,local); 47*4887Schin 48*4887Schin for(;; f->mode &= ~SF_LOCK) 49*4887Schin { /* check stream mode */ 50*4887Schin if(SFMODE(f,local) != SF_WRITE && _sfmode(f,SF_WRITE,local) < 0) 51*4887Schin SFMTXRETURN(f, -1); 52*4887Schin SFLOCK(f,local); 53*4887Schin 54*4887Schin /* current data extent */ 55*4887Schin n = f->next - (data = f->data); 56*4887Schin 57*4887Schin if(n == (f->endb-data) && (f->flags&SF_STRING)) 58*4887Schin { /* extend string stream buffer */ 59*4887Schin (void)SFWR(f,data,1,f->disc); 60*4887Schin 61*4887Schin /* !(f->flags&SF_STRING) is required because exception 62*4887Schin handlers may turn a string stream to a file stream */ 63*4887Schin if(f->next < f->endb || !(f->flags&SF_STRING) ) 64*4887Schin n = f->next - (data = f->data); 65*4887Schin else 66*4887Schin { SFOPEN(f,local); 67*4887Schin SFMTXRETURN(f, -1); 68*4887Schin } 69*4887Schin } 70*4887Schin 71*4887Schin if(c >= 0) 72*4887Schin { /* write into buffer */ 73*4887Schin if(n < (f->endb - (data = f->data))) 74*4887Schin { *f->next++ = c; 75*4887Schin if(c == '\n' && 76*4887Schin (f->flags&SF_LINE) && !(f->flags&SF_STRING)) 77*4887Schin { c = -1; 78*4887Schin n += 1; 79*4887Schin } 80*4887Schin else break; 81*4887Schin } 82*4887Schin else if(n == 0) 83*4887Schin { /* unbuffered io */ 84*4887Schin outc = (uchar)c; 85*4887Schin data = &outc; 86*4887Schin c = -1; 87*4887Schin n = 1; 88*4887Schin } 89*4887Schin } 90*4887Schin 91*4887Schin if(n == 0 || (f->flags&SF_STRING)) 92*4887Schin break; 93*4887Schin 94*4887Schin isall = SFISALL(f,isall); 95*4887Schin if((w = SFWR(f,data,n,f->disc)) > 0) 96*4887Schin { if((n -= w) > 0) /* save unwritten data, then resume */ 97*4887Schin memcpy((char*)f->data,(char*)data+w,n); 98*4887Schin f->next = f->data+n; 99*4887Schin if(c < 0 && (!isall || n == 0)) 100*4887Schin break; 101*4887Schin } 102*4887Schin else if(w == 0) 103*4887Schin { SFOPEN(f,local); 104*4887Schin SFMTXRETURN(f, -1); 105*4887Schin } 106*4887Schin else if(c < 0) 107*4887Schin break; 108*4887Schin } 109*4887Schin 110*4887Schin SFOPEN(f,local); 111*4887Schin 112*4887Schin if(inpc < 0) 113*4887Schin inpc = f->endb-f->next; 114*4887Schin 115*4887Schin SFMTXRETURN(f,inpc); 116*4887Schin } 117