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 #pragma prototyped 23 /* 24 * opendir, closedir 25 * 26 * open|close directory stream 27 * 28 * POSIX compatible directory stream access routines: 29 * 30 * #include <sys/types.h> 31 * #include <dirent.h> 32 * 33 * NOTE: readdir() returns a pointer to struct dirent 34 */ 35 36 #include "dirlib.h" 37 38 #if _dir_ok 39 40 NoN(opendir) 41 42 #else 43 44 static const char id_dir[] = "\n@(#)$Id: directory (AT&T Research) 1993-04-01 $\0\n"; 45 46 static DIR* freedirp; /* always keep one dirp */ 47 48 DIR* 49 opendir(register const char* path) 50 { 51 register DIR* dirp = 0; 52 register int fd; 53 struct stat st; 54 55 if ((fd = open(path, O_RDONLY)) < 0) return(0); 56 if (fstat(fd, &st) < 0 || 57 !S_ISDIR(st.st_mode) && (errno = ENOTDIR) || 58 fcntl(fd, F_SETFD, FD_CLOEXEC) || 59 !(dirp = freedirp ? freedirp : 60 #if defined(_DIR_PRIVATE_) || _ptr_dd_buf 61 newof(0, DIR, 1, DIRBLKSIZ) 62 #else 63 newof(0, DIR, 1, 0) 64 #endif 65 )) 66 { 67 close(fd); 68 if (dirp) 69 { 70 if (!freedirp) freedirp = dirp; 71 else free(dirp); 72 } 73 return(0); 74 } 75 freedirp = 0; 76 dirp->dd_fd = fd; 77 dirp->dd_loc = dirp->dd_size = 0; /* refill needed */ 78 #if defined(_DIR_PRIVATE_) || _ptr_dd_buf 79 dirp->dd_buf = (void*)((char*)dirp + sizeof(DIR)); 80 #endif 81 return(dirp); 82 } 83 84 void 85 closedir(register DIR* dirp) 86 { 87 if (dirp) 88 { 89 close(dirp->dd_fd); 90 if (!freedirp) freedirp = dirp; 91 else free(dirp); 92 } 93 } 94 95 #endif 96