projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 25a197fc C |
1 | /* $Header: ndir.c,v 4.3.1.3 85/05/23 11:19:24 lwall Exp $ |
| 2 | * | |
| 3 | * $Log: ndir.c,v $ | |
| 4 | * Revision 4.3.1.3 85/05/23 11:19:24 lwall | |
| 5 | * Oops, shouldn't have included sys/types.h again. | |
| 6 | * | |
| 7 | * Revision 4.3.1.2 85/05/15 14:46:00 lwall | |
| 8 | * Changed short to ino_t, which may be ushort on some systems. | |
| 9 | * | |
| 10 | * Revision 4.3.1.1 85/05/10 11:35:34 lwall | |
| 11 | * Branch for patches. | |
| 12 | * | |
| 13 | * Revision 4.3 85/05/01 11:42:55 lwall | |
| 14 | * Baseline for release with 4.3bsd. | |
| 15 | * | |
| 16 | */ | |
| 17 | ||
| 18 | #include "EXTERN.h" | |
| 19 | #include "common.h" | |
| 20 | #include "INTERN.h" | |
| 21 | #include "ndir.h" | |
| 22 | ||
| 23 | #ifdef USENDIR | |
| 24 | /* | |
| 25 | * support for Berkeley directory reading routine on a V7 file system | |
| 26 | */ | |
| 27 | ||
| 28 | /* | |
| 29 | * open a directory. | |
| 30 | */ | |
| 31 | DIR * | |
| 32 | opendir(name) | |
| 33 | char *name; | |
| 34 | { | |
| 35 | register DIR *dirp; | |
| 36 | register int fd; | |
| 37 | ||
| 38 | if ((fd = open(name, 0)) == -1) | |
| 39 | return NULL; | |
| 40 | if ((dirp = (DIR *)malloc(sizeof(DIR))) == NULL) { | |
| 41 | close (fd); | |
| 42 | return NULL; | |
| 43 | } | |
| 44 | dirp->dd_fd = fd; | |
| 45 | dirp->dd_loc = 0; | |
| 46 | return dirp; | |
| 47 | } | |
| 48 | ||
| 49 | /* | |
| 50 | * read an old style directory entry and present it as a new one | |
| 51 | */ | |
| 52 | #ifndef pyr | |
| 53 | #define ODIRSIZ 14 | |
| 54 | ||
| 55 | struct olddirect { | |
| 56 | ino_t od_ino; | |
| 57 | char od_name[ODIRSIZ]; | |
| 58 | }; | |
| 59 | #else an Pyramid in the ATT universe | |
| 60 | #define ODIRSIZ 248 | |
| 61 | ||
| 62 | struct olddirect { | |
| 63 | long od_ino; | |
| 64 | short od_fill1, od_fill2; | |
| 65 | char od_name[ODIRSIZ]; | |
| 66 | }; | |
| 67 | #endif | |
| 68 | ||
| 69 | /* | |
| 70 | * get next entry in a directory. | |
| 71 | */ | |
| 72 | struct direct * | |
| 73 | readdir(dirp) | |
| 74 | register DIR *dirp; | |
| 75 | { | |
| 76 | register struct olddirect *dp; | |
| 77 | static struct direct dir; | |
| 78 | ||
| 79 | for (;;) { | |
| 80 | if (dirp->dd_loc == 0) { | |
| 81 | dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, | |
| 82 | DIRBLKSIZ); | |
| 83 | if (dirp->dd_size <= 0) | |
| 84 | return NULL; | |
| 85 | } | |
| 86 | if (dirp->dd_loc >= dirp->dd_size) { | |
| 87 | dirp->dd_loc = 0; | |
| 88 | continue; | |
| 89 | } | |
| 90 | dp = (struct olddirect *)(dirp->dd_buf + dirp->dd_loc); | |
| 91 | dirp->dd_loc += sizeof(struct olddirect); | |
| 92 | if (dp->od_ino == 0) | |
| 93 | continue; | |
| 94 | dir.d_ino = dp->od_ino; | |
| 95 | strncpy(dir.d_name, dp->od_name, ODIRSIZ); | |
| 96 | dir.d_name[ODIRSIZ] = '\0'; /* insure null termination */ | |
| 97 | dir.d_namlen = strlen(dir.d_name); | |
| 98 | dir.d_reclen = DIRSIZ(&dir); | |
| 99 | return (&dir); | |
| 100 | } | |
| 101 | } | |
| 102 | ||
| 103 | /* | |
| 104 | * close a directory. | |
| 105 | */ | |
| 106 | void | |
| 107 | closedir(dirp) | |
| 108 | register DIR *dirp; | |
| 109 | { | |
| 110 | close(dirp->dd_fd); | |
| 111 | dirp->dd_fd = -1; | |
| 112 | dirp->dd_loc = 0; | |
| 113 | free(dirp); | |
| 114 | } | |
| 115 | #endif USENDIR |