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#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 40NoN(opendir) 41 42#else 43 44static const char id_dir[] = "\n@(#)$Id: directory (AT&T Research) 1993-04-01 $\0\n"; 45 46static DIR* freedirp; /* always keep one dirp */ 47 48DIR* 49opendir(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 84void 85closedir(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