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 #pragma prototyped 23*4887Schin /* 24*4887Schin * Glenn Fowler 25*4887Schin * AT&T Bell Laboratories 26*4887Schin * 27*4887Schin * copy from rfd to wfd (with conditional mmap hacks) 28*4887Schin */ 29*4887Schin 30*4887Schin #include <ast.h> 31*4887Schin #include <ast_mmap.h> 32*4887Schin 33*4887Schin #if _mmap_worthy > 1 34*4887Schin 35*4887Schin #include <ls.h> 36*4887Schin 37*4887Schin #define MAPSIZE (1024*256) 38*4887Schin 39*4887Schin #endif 40*4887Schin 41*4887Schin #undef BUFSIZ 42*4887Schin #define BUFSIZ 4096 43*4887Schin 44*4887Schin /* 45*4887Schin * copy n bytes from rfd to wfd 46*4887Schin * actual byte count returned 47*4887Schin * if n<=0 then ``good'' size is used 48*4887Schin */ 49*4887Schin 50*4887Schin off_t 51*4887Schin astcopy(int rfd, int wfd, off_t n) 52*4887Schin { 53*4887Schin register off_t c; 54*4887Schin #ifdef MAPSIZE 55*4887Schin off_t pos; 56*4887Schin off_t mapsize; 57*4887Schin char* mapbuf; 58*4887Schin struct stat st; 59*4887Schin #endif 60*4887Schin 61*4887Schin static int bufsiz; 62*4887Schin static char* buf; 63*4887Schin 64*4887Schin if (n <= 0 || n >= BUFSIZ * 2) 65*4887Schin { 66*4887Schin #if MAPSIZE 67*4887Schin if (!fstat(rfd, &st) && S_ISREG(st.st_mode) && (pos = lseek(rfd, (off_t)0, 1)) != ((off_t)-1)) 68*4887Schin { 69*4887Schin if (pos >= st.st_size) return(0); 70*4887Schin mapsize = st.st_size - pos; 71*4887Schin if (mapsize > MAPSIZE) mapsize = (mapsize > n && n > 0) ? n : MAPSIZE; 72*4887Schin if (mapsize >= BUFSIZ * 2 && (mapbuf = (char*)mmap(NiL, mapsize, PROT_READ, MAP_SHARED, rfd, pos)) != ((caddr_t)-1)) 73*4887Schin { 74*4887Schin if (write(wfd, mapbuf, mapsize) != mapsize || lseek(rfd, mapsize, 1) == ((off_t)-1)) return(-1); 75*4887Schin munmap((caddr_t)mapbuf, mapsize); 76*4887Schin return(mapsize); 77*4887Schin } 78*4887Schin } 79*4887Schin #endif 80*4887Schin if (n <= 0) n = BUFSIZ; 81*4887Schin } 82*4887Schin if (n > bufsiz) 83*4887Schin { 84*4887Schin if (buf) free(buf); 85*4887Schin bufsiz = roundof(n, BUFSIZ); 86*4887Schin if (!(buf = newof(0, char, bufsiz, 0))) return(-1); 87*4887Schin } 88*4887Schin if ((c = read(rfd, buf, (size_t)n)) > 0 && write(wfd, buf, (size_t)c) != c) c = -1; 89*4887Schin return(c); 90*4887Schin } 91