2 * Copyright (c) 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Hugh Smith at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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39 static char sccsid[] = "@(#)archive.c 8.3 (Berkeley) 4/2/94";
43 #include <sys/cdefs.h>
44 __FBSDID("$FreeBSD$");
46 #include <sys/param.h>
63 typedef struct ar_hdr HDR;
64 static char hb[sizeof(HDR) + 1]; /* real header */
76 if ((fd = open(archive, mode, DEFFILEMODE)) >= 0) {
77 /* POSIX.2 puts create message on stderr. */
78 if (!(options & AR_C))
79 warnx("creating archive %s", archive);
87 if ((fd = open(archive, mode, DEFFILEMODE)) < 0)
91 * Attempt to place a lock on the opened file - if we get an
92 * error then someone is already working on this library (or
93 * it's going across NFS).
95 opened: if (flock(fd, LOCK_EX|LOCK_NB) && errno != EOPNOTSUPP)
99 * If not created, O_RDONLY|O_RDWR indicates that it has to be
103 ((mode & O_ACCMODE) == O_RDONLY || (mode & O_ACCMODE) == O_RDWR)) {
104 if ((nr = read(fd, buf, SARMAG) != SARMAG)) {
108 } else if (bcmp(buf, ARMAG, SARMAG))
110 } else if (write(fd, ARMAG, SARMAG) != SARMAG)
120 (void)close(fd); /* Implicit unlock. */
123 /* Convert ar header field to an integer. */
124 #define AR_ATOI(from, to, len, base) { \
125 memmove(buf, from, len); \
127 to = strtol(buf, (char **)NULL, base); \
132 * read the archive header for this member
142 nr = read(fd, hb, sizeof(HDR));
143 if (nr != sizeof(HDR)) {
151 hdr = (struct ar_hdr *)hb;
152 if (strncmp(hdr->ar_fmag, ARFMAG, sizeof(ARFMAG) - 1))
155 /* Convert the header into the internal format. */
159 AR_ATOI(hdr->ar_date, chdr.date, sizeof(hdr->ar_date), DECIMAL);
160 AR_ATOI(hdr->ar_uid, chdr.uid, sizeof(hdr->ar_uid), DECIMAL);
161 AR_ATOI(hdr->ar_gid, chdr.gid, sizeof(hdr->ar_gid), DECIMAL);
162 AR_ATOI(hdr->ar_mode, chdr.mode, sizeof(hdr->ar_mode), OCTAL);
163 AR_ATOI(hdr->ar_size, chdr.size, sizeof(hdr->ar_size), DECIMAL);
165 /* Leading spaces should never happen. */
166 if (hdr->ar_name[0] == ' ')
170 * Long name support. Set the "real" size of the file, and the
171 * long name flag/size.
173 if (!bcmp(hdr->ar_name, AR_EFMT1, sizeof(AR_EFMT1) - 1)) {
174 chdr.lname = len = atoi(hdr->ar_name + sizeof(AR_EFMT1) - 1);
175 if (len <= 0 || len > MAXNAMLEN)
177 nr = read(fd, chdr.name, len);
187 memmove(chdr.name, hdr->ar_name, sizeof(hdr->ar_name));
189 /* Strip trailing spaces, null terminate. */
190 for (p = chdr.name + sizeof(hdr->ar_name) - 1; *p == ' '; --p);
196 static int already_written;
200 * Write an archive member to a file.
213 * If passed an sb structure, reading a file from disk. Get stat(2)
214 * information, build a name and construct a header. (Files are named
215 * by their last component in the archive.) If not, then just write
216 * the last header read.
219 name = basename(cfp->rname);
220 (void)fstat(cfp->rfd, sb);
223 * If not truncating names and the name is too long or contains
224 * a space, use extended format 1.
226 lname = strlen(name);
227 if (options & AR_TR) {
228 if (lname > OLDARMAXNAME) {
229 (void)fflush(stdout);
230 warnx("warning: %s truncated to %.*s",
231 name, OLDARMAXNAME, name);
232 (void)fflush(stderr);
234 (void)sprintf(hb, HDR3, name,
235 (long)sb->st_mtimespec.tv_sec, sb->st_uid,
236 sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
238 } else if (lname > sizeof(hdr->ar_name) || strchr(name, ' '))
239 (void)sprintf(hb, HDR1, AR_EFMT1, lname,
240 (long)sb->st_mtimespec.tv_sec, sb->st_uid,
241 sb->st_gid, sb->st_mode, sb->st_size + lname,
245 (void)sprintf(hb, HDR2, name,
246 (long)sb->st_mtimespec.tv_sec, sb->st_uid,
247 sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
256 if (write(cfp->wfd, hb, sizeof(HDR)) != sizeof(HDR))
259 if ((size_t)write(cfp->wfd, name, lname) != lname)
261 already_written = lname;
269 * Copy size bytes from one file to another - taking care to handle the
270 * extra byte (for odd size files) when reading archives and writing an
271 * extra byte if necessary when adding files to archive. The length of
272 * the object is the long name plus the object itself; the variable
273 * already_written gets set if a long name was written.
275 * The padding is really unnecessary, and is almost certainly a remnant
276 * of early archive formats where the header included binary data which
277 * a PDP-11 required to start on an even byte boundary. (Or, perhaps,
278 * because 16-bit word addressed copies were faster?) Anyhow, it should
279 * have been ripped out long ago.
286 static char pad = '\n';
288 int from, nr = 0, nw, off, to;
297 while (sz && (nr = read(from, buf, MIN(sz, sizeof(buf)))) > 0) {
299 for (off = 0; off < nr; nr -= off, off += nw)
300 if ((nw = write(to, buf + off, nr)) < 0)
309 if (cfp->flags & RPAD && (size + chdr.lname) & 1 &&
310 (nr = read(from, buf, 1)) != 1) {
315 if (cfp->flags & WPAD && (size + already_written) & 1 &&
316 write(to, &pad, 1) != 1)
322 * Skip over an object -- taking care to skip the pad bytes.
330 len = chdr.size + ( (chdr.size + chdr.lname) & 1);
331 if (lseek(fd, len, SEEK_CUR) == (off_t)-1)