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d2fc2cec WJ |
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 | * Redistribution and use in source and binary forms, with or without | |
9 | * modification, are permitted provided that the following conditions | |
10 | * are met: | |
11 | * 1. Redistributions of source code must retain the above copyright | |
12 | * notice, this list of conditions and the following disclaimer. | |
13 | * 2. Redistributions in binary form must reproduce the above copyright | |
14 | * notice, this list of conditions and the following disclaimer in the | |
15 | * documentation and/or other materials provided with the distribution. | |
16 | * 3. All advertising materials mentioning features or use of this software | |
17 | * must display the following acknowledgement: | |
18 | * This product includes software developed by the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #ifndef lint | |
38 | static char sccsid[] = "@(#)archive.c 5.7 (Berkeley) 3/21/91"; | |
39 | #endif /* not lint */ | |
40 | ||
41 | #include <sys/param.h> | |
42 | #include <sys/stat.h> | |
43 | #include <fcntl.h> | |
44 | #include <unistd.h> | |
45 | #include <errno.h> | |
46 | #include <dirent.h> | |
47 | #include <ar.h> | |
48 | #include <stdio.h> | |
49 | #include <stdlib.h> | |
50 | #include <string.h> | |
51 | #include "archive.h" | |
52 | #include "extern.h" | |
53 | ||
54 | extern CHDR chdr; /* converted header */ | |
55 | extern char *archive; /* archive name */ | |
56 | ||
57 | typedef struct ar_hdr HDR; | |
58 | static char hb[sizeof(HDR) + 1]; /* real header */ | |
59 | ||
60 | open_archive(mode) | |
61 | int mode; | |
62 | { | |
63 | int created, fd, nr; | |
64 | char buf[SARMAG]; | |
65 | ||
66 | created = 0; | |
67 | if (mode & O_CREAT) { | |
68 | mode |= O_EXCL; | |
69 | if ((fd = open(archive, mode, DEFFILEMODE)) >= 0) { | |
70 | /* POSIX.2 puts create message on stderr. */ | |
71 | if (!(options & AR_C)) | |
72 | (void)fprintf(stderr, | |
73 | "ar: creating archive %s.\n", archive); | |
74 | created = 1; | |
75 | goto opened; | |
76 | } | |
77 | if (errno != EEXIST) | |
78 | error(archive); | |
79 | mode &= ~O_EXCL; | |
80 | } | |
81 | if ((fd = open(archive, mode, DEFFILEMODE)) < 0) | |
82 | error(archive); | |
83 | ||
84 | /* | |
85 | * Attempt to place a lock on the opened file - if we get an | |
86 | * error then someone is already working on this library (or | |
87 | * it's going across NFS). | |
88 | */ | |
89 | opened: if (flock(fd, LOCK_EX|LOCK_NB) && errno != EOPNOTSUPP) | |
90 | error(archive); | |
91 | ||
92 | /* | |
93 | * If not created, O_RDONLY|O_RDWR indicates that it has to be | |
94 | * in archive format. | |
95 | */ | |
96 | if (!created && | |
97 | ((mode & O_ACCMODE) == O_RDONLY || (mode & O_ACCMODE) == O_RDWR)) { | |
98 | if ((nr = read(fd, buf, SARMAG) != SARMAG)) { | |
99 | if (nr >= 0) | |
100 | badfmt(); | |
101 | error(archive); | |
102 | } else if (bcmp(buf, ARMAG, SARMAG)) | |
103 | badfmt(); | |
104 | } else if (write(fd, ARMAG, SARMAG) != SARMAG) | |
105 | error(archive); | |
106 | return(fd); | |
107 | } | |
108 | ||
109 | void | |
110 | close_archive(fd) | |
111 | int fd; | |
112 | { | |
113 | (void)close(fd); /* Implicit unlock. */ | |
114 | } | |
115 | ||
116 | /* Convert ar header field to an integer. */ | |
117 | #define AR_ATOI(from, to, len, base) { \ | |
118 | bcopy(from, buf, len); \ | |
119 | buf[len] = '\0'; \ | |
120 | to = strtol(buf, (char **)NULL, base); \ | |
121 | } | |
122 | ||
123 | /* | |
124 | * get_arobj -- | |
125 | * read the archive header for this member | |
126 | */ | |
127 | get_arobj(fd) | |
128 | int fd; | |
129 | { | |
130 | struct ar_hdr *hdr; | |
131 | register int len, nr; | |
132 | register char *p, buf[20]; | |
133 | ||
134 | nr = read(fd, hb, sizeof(HDR)); | |
135 | if (nr != sizeof(HDR)) { | |
136 | if (!nr) | |
137 | return(0); | |
138 | if (nr < 0) | |
139 | error(archive); | |
140 | badfmt(); | |
141 | } | |
142 | ||
143 | hdr = (struct ar_hdr *)hb; | |
144 | if (strncmp(hdr->ar_fmag, ARFMAG, sizeof(ARFMAG) - 1)) | |
145 | badfmt(); | |
146 | ||
147 | /* Convert the header into the internal format. */ | |
148 | #define DECIMAL 10 | |
149 | #define OCTAL 8 | |
150 | ||
151 | AR_ATOI(hdr->ar_date, chdr.date, sizeof(hdr->ar_date), DECIMAL); | |
152 | AR_ATOI(hdr->ar_uid, chdr.uid, sizeof(hdr->ar_uid), DECIMAL); | |
153 | AR_ATOI(hdr->ar_gid, chdr.gid, sizeof(hdr->ar_gid), DECIMAL); | |
154 | AR_ATOI(hdr->ar_mode, chdr.mode, sizeof(hdr->ar_mode), OCTAL); | |
155 | AR_ATOI(hdr->ar_size, chdr.size, sizeof(hdr->ar_size), DECIMAL); | |
156 | ||
157 | /* Leading spaces should never happen. */ | |
158 | if (hdr->ar_name[0] == ' ') | |
159 | badfmt(); | |
160 | ||
161 | /* | |
162 | * Long name support. Set the "real" size of the file, and the | |
163 | * long name flag/size. | |
164 | */ | |
165 | if (!bcmp(hdr->ar_name, AR_EFMT1, sizeof(AR_EFMT1) - 1)) { | |
166 | chdr.lname = len = atoi(hdr->ar_name + sizeof(AR_EFMT1) - 1); | |
167 | if (len <= 0 || len > MAXNAMLEN) | |
168 | badfmt(); | |
169 | nr = read(fd, chdr.name, len); | |
170 | if (nr != len) { | |
171 | if (nr < 0) | |
172 | error(archive); | |
173 | badfmt(); | |
174 | } | |
175 | chdr.name[len] = 0; | |
176 | chdr.size -= len; | |
177 | } else { | |
178 | chdr.lname = 0; | |
179 | bcopy(hdr->ar_name, chdr.name, sizeof(hdr->ar_name)); | |
180 | ||
181 | /* Strip trailing spaces, null terminate. */ | |
182 | for (p = chdr.name + sizeof(hdr->ar_name) - 1; *p == ' '; --p); | |
183 | *++p = '\0'; | |
184 | } | |
185 | return(1); | |
186 | } | |
187 | ||
188 | static int already_written; | |
189 | ||
190 | /* | |
191 | * put_arobj -- | |
192 | * Write an archive member to a file. | |
193 | */ | |
194 | put_arobj(cfp, sb) | |
195 | CF *cfp; | |
196 | struct stat *sb; | |
197 | { | |
198 | register int lname; | |
199 | register char *name; | |
200 | struct ar_hdr *hdr; | |
201 | off_t size; | |
202 | ||
203 | /* | |
204 | * If passed an sb structure, reading a file from disk. Get stat(2) | |
205 | * information, build a name and construct a header. (Files are named | |
206 | * by their last component in the archive.) If not, then just write | |
207 | * the last header read. | |
208 | */ | |
209 | if (sb) { | |
210 | name = rname(cfp->rname); | |
211 | (void)fstat(cfp->rfd, sb); | |
212 | ||
213 | /* | |
214 | * If not truncating names and the name is too long or contains | |
215 | * a space, use extended format 1. | |
216 | */ | |
217 | lname = strlen(name); | |
218 | if (options & AR_TR) { | |
219 | if (lname > OLDARMAXNAME) { | |
220 | (void)fflush(stdout); | |
221 | (void)fprintf(stderr, | |
222 | "ar: warning: %s truncated to %.*s\n", | |
223 | name, OLDARMAXNAME, name); | |
224 | (void)fflush(stderr); | |
225 | } | |
226 | (void)sprintf(hb, HDR3, name, sb->st_mtime, sb->st_uid, | |
227 | sb->st_gid, sb->st_mode, sb->st_size, ARFMAG); | |
228 | lname = 0; | |
229 | } else if (lname > sizeof(hdr->ar_name) || index(name, ' ')) | |
230 | (void)sprintf(hb, HDR1, AR_EFMT1, lname, sb->st_mtime, | |
231 | sb->st_uid, sb->st_gid, sb->st_mode, | |
232 | sb->st_size + lname, ARFMAG); | |
233 | else { | |
234 | lname = 0; | |
235 | (void)sprintf(hb, HDR2, name, sb->st_mtime, sb->st_uid, | |
236 | sb->st_gid, sb->st_mode, sb->st_size, ARFMAG); | |
237 | } | |
238 | size = sb->st_size; | |
239 | } else { | |
240 | lname = chdr.lname; | |
241 | name = chdr.name; | |
242 | size = chdr.size; | |
243 | } | |
244 | ||
245 | if (write(cfp->wfd, hb, sizeof(HDR)) != sizeof(HDR)) | |
246 | error(cfp->wname); | |
247 | if (lname) { | |
248 | if (write(cfp->wfd, name, lname) != lname) | |
249 | error(cfp->wname); | |
250 | already_written = lname; | |
251 | } | |
252 | copy_ar(cfp, size); | |
253 | already_written = 0; | |
254 | } | |
255 | ||
256 | /* | |
257 | * copy_ar -- | |
258 | * Copy size bytes from one file to another - taking care to handle the | |
259 | * extra byte (for odd size files) when reading archives and writing an | |
260 | * extra byte if necessary when adding files to archive. The length of | |
261 | * the object is the long name plus the object itself; the variable | |
262 | * already_written gets set if a long name was written. | |
263 | * | |
264 | * The padding is really unnecessary, and is almost certainly a remnant | |
265 | * of early archive formats where the header included binary data which | |
266 | * a PDP-11 required to start on an even byte boundary. (Or, perhaps, | |
267 | * because 16-bit word addressed copies were faster?) Anyhow, it should | |
268 | * have been ripped out long ago. | |
269 | */ | |
270 | copy_ar(cfp, size) | |
271 | CF *cfp; | |
272 | off_t size; | |
273 | { | |
274 | static char pad = '\n'; | |
275 | register off_t sz; | |
276 | register int from, nr, nw, off, to; | |
277 | char buf[8*1024]; | |
278 | ||
279 | if (!(sz = size)) | |
280 | return; | |
281 | ||
282 | from = cfp->rfd; | |
283 | to = cfp->wfd; | |
284 | sz = size; | |
285 | while (sz && (nr = read(from, buf, MIN(sz, sizeof(buf)))) > 0) { | |
286 | sz -= nr; | |
287 | for (off = 0; off < nr; nr -= off, off += nw) | |
288 | if ((nw = write(to, buf + off, nr)) < 0) | |
289 | error(cfp->wname); | |
290 | } | |
291 | if (sz) { | |
292 | if (nr == 0) | |
293 | badfmt(); | |
294 | error(cfp->rname); | |
295 | } | |
296 | ||
297 | if (cfp->flags & RPAD && size & 1 && (nr = read(from, buf, 1)) != 1) { | |
298 | if (nr == 0) | |
299 | badfmt(); | |
300 | error(cfp->rname); | |
301 | } | |
302 | if (cfp->flags & WPAD && (size + already_written) & 1 && | |
303 | write(to, &pad, 1) != 1) | |
304 | error(cfp->wname); | |
305 | } | |
306 | ||
307 | /* | |
308 | * skip_arobj - | |
309 | * Skip over an object -- taking care to skip the pad bytes. | |
310 | */ | |
311 | void | |
312 | skip_arobj(fd) | |
313 | int fd; | |
314 | { | |
315 | off_t len; | |
316 | ||
317 | len = chdr.size + (chdr.size + chdr.lname & 1); | |
318 | if (lseek(fd, len, SEEK_CUR) == (off_t)-1) | |
319 | error(archive); | |
320 | } |