projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 6276da5a KB |
1 | /*- |
| 2 | * Copyright (c) 1990 The Regents of the University of California. | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * This code is derived from software contributed to Berkeley by | |
| 6 | * Hugh Smith at The University of Guelph. | |
| 7 | * | |
| 8 | * %sccs.include.redist.c% | |
| 9 | */ | |
| 10 | ||
| 11 | #ifndef lint | |
| 12 | static char sccsid[] = "@(#)archive.c 5.1 (Berkeley) %G%"; | |
| 13 | #endif /* not lint */ | |
| 14 | ||
| 15 | #include <sys/param.h> | |
| 16 | #include <sys/errno.h> | |
| 17 | #include <sys/stat.h> | |
| 18 | #include <fcntl.h> | |
| 19 | #include <unistd.h> | |
| 20 | #include <dirent.h> | |
| 21 | #include <stdio.h> | |
| 22 | #include <stdlib.h> | |
| 23 | #include <string.h> | |
| 24 | #include <ar.h> | |
| 25 | #include "archive.h" | |
| 26 | ||
| 27 | extern char *archive; /* archive name */ | |
| 28 | ||
| 29 | open_archive(mode) | |
| 30 | int mode; | |
| 31 | { | |
| 32 | int created, fd, nr; | |
| 33 | char buf[SARMAG]; | |
| 34 | ||
| 35 | created = 0; | |
| 36 | if (mode & O_CREAT) { | |
| 37 | mode |= O_EXCL; | |
| 38 | if ((fd = open(archive, mode, DEFFILEMODE)) >= 0) { | |
| 39 | /* POSIX.2 puts create message on stderr. */ | |
| 40 | if (!(options & AR_C)) | |
| 41 | (void)fprintf(stderr, | |
| 42 | "ar: creating archive %s.\n", archive); | |
| 43 | created = 1; | |
| 44 | goto opened; | |
| 45 | } | |
| 46 | if (errno != EEXIST) | |
| 47 | error(archive); | |
| 48 | mode &= ~O_EXCL; | |
| 49 | } | |
| 50 | if ((fd = open(archive, mode, DEFFILEMODE)) < 0) | |
| 51 | error(archive); | |
| 52 | ||
| 53 | /* | |
| 54 | * Attempt to place a lock on the opened file - if we get an | |
| 55 | * error then someone is already working on this library. | |
| 56 | */ | |
| 57 | opened: if (flock(fd, LOCK_EX|LOCK_NB)) | |
| 58 | error(archive); | |
| 59 | ||
| 60 | /* | |
| 61 | * If not created, O_RDONLY|O_RDWR indicates that it has to be | |
| 62 | * in archive format. | |
| 63 | */ | |
| 64 | if (!created && | |
| 65 | ((mode & O_ACCMODE) == O_RDONLY || (mode & O_ACCMODE) == O_RDWR)) { | |
| 66 | if ((nr = read(fd, buf, SARMAG) != SARMAG)) { | |
| 67 | if (nr >= 0) | |
| 68 | badfmt(); | |
| 69 | error(archive); | |
| 70 | } else if (bcmp(buf, ARMAG, SARMAG)) | |
| 71 | badfmt(); | |
| 72 | } else if (write(fd, ARMAG, SARMAG) != SARMAG) | |
| 73 | error(archive); | |
| 74 | return(fd); | |
| 75 | } | |
| 76 | ||
| 77 | close_archive(fd) | |
| 78 | int fd; | |
| 79 | { | |
| 80 | (void)flock(fd, LOCK_UN); | |
| 81 | (void)close(fd); | |
| 82 | } | |
| 83 | ||
| 84 | /* | |
| 85 | * copyfile -- | |
| 86 | * Copy size bytes from one file to another - taking care to handle the | |
| 87 | * extra byte (for odd size files) when reading archives and tmpfiles | |
| 88 | * and writing an extra byte if necessary when adding files to archive. | |
| 89 | * | |
| 90 | * The padding is really unnecessary, and is almost certainly a remnant | |
| 91 | * of early archive formats where the header included binary data which | |
| 92 | * a PDP-11 required to start on an even byte boundary. It should have | |
| 93 | * been ripped out when the format changed. | |
| 94 | */ | |
| 95 | copyfile(cfp, size) | |
| 96 | CF *cfp; | |
| 97 | register off_t size; | |
| 98 | { | |
| 99 | register int from, nr, nw, off, to; | |
| 100 | char pad, buf[8*1024]; | |
| 101 | ||
| 102 | if (!size) | |
| 103 | return; | |
| 104 | ||
| 105 | pad = size & 1; | |
| 106 | from = cfp->rfd; | |
| 107 | to = cfp->wfd; | |
| 108 | while (size && | |
| 109 | (nr = read(from, buf, MIN(size, sizeof(buf)))) > 0) { | |
| 110 | size -= nr; | |
| 111 | for (off = 0; off < nr; nr -= off, off += nw) | |
| 112 | if ((nw = write(to, buf + off, nr)) < 0) | |
| 113 | error(cfp->wname); | |
| 114 | } | |
| 115 | if (size) { | |
| 116 | if (nr == 0) | |
| 117 | badfmt(); | |
| 118 | error(cfp->rname); | |
| 119 | } | |
| 120 | ||
| 121 | if (pad) { | |
| 122 | if (cfp->flags & RPAD && (nr = read(from, buf, 1)) != 1) { | |
| 123 | if (nr == 0) | |
| 124 | badfmt(); | |
| 125 | error(cfp->rname); | |
| 126 | } | |
| 127 | if (cfp->flags & WPAD) { | |
| 128 | pad = '\n'; | |
| 129 | if (write(to, &pad, 1) != 1) | |
| 130 | error(cfp->wname); | |
| 131 | } | |
| 132 | } | |
| 133 | } |