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.
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9 * modification, are permitted provided that the following conditions
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18 * This product includes software developed by the University of
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36 * @(#)archive.c 8.3 (Berkeley) 4/2/94
37 * $FreeBSD: src/usr.bin/ar/archive.c,v 1.10.6.1 2001/08/02 00:51:00 obrien Exp $
38 * $DragonFly: src/usr.bin/ar/Attic/archive.c,v 1.2 2003/06/17 04:29:25 dillon Exp $
41 #include <sys/param.h>
58 typedef struct ar_hdr HDR;
59 static char hb[sizeof(HDR) + 1]; /* real header */
71 if ((fd = open(archive, mode, DEFFILEMODE)) >= 0) {
72 /* POSIX.2 puts create message on stderr. */
73 if (!(options & AR_C))
74 warnx("creating archive %s", archive);
82 if ((fd = open(archive, mode, DEFFILEMODE)) < 0)
86 * Attempt to place a lock on the opened file - if we get an
87 * error then someone is already working on this library (or
88 * it's going across NFS).
90 opened: if (flock(fd, LOCK_EX|LOCK_NB) && errno != EOPNOTSUPP)
94 * If not created, O_RDONLY|O_RDWR indicates that it has to be
98 ((mode & O_ACCMODE) == O_RDONLY || (mode & O_ACCMODE) == O_RDWR)) {
99 if ((nr = read(fd, buf, SARMAG) != SARMAG)) {
103 } else if (bcmp(buf, ARMAG, SARMAG))
105 } else if (write(fd, ARMAG, SARMAG) != SARMAG)
115 (void)close(fd); /* Implicit unlock. */
118 /* Convert ar header field to an integer. */
119 #define AR_ATOI(from, to, len, base) { \
120 memmove(buf, from, len); \
122 to = strtol(buf, (char **)NULL, base); \
127 * read the archive header for this member
137 nr = read(fd, hb, sizeof(HDR));
138 if (nr != sizeof(HDR)) {
146 hdr = (struct ar_hdr *)hb;
147 if (strncmp(hdr->ar_fmag, ARFMAG, sizeof(ARFMAG) - 1))
150 /* Convert the header into the internal format. */
154 AR_ATOI(hdr->ar_date, chdr.date, sizeof(hdr->ar_date), DECIMAL);
155 AR_ATOI(hdr->ar_uid, chdr.uid, sizeof(hdr->ar_uid), DECIMAL);
156 AR_ATOI(hdr->ar_gid, chdr.gid, sizeof(hdr->ar_gid), DECIMAL);
157 AR_ATOI(hdr->ar_mode, chdr.mode, sizeof(hdr->ar_mode), OCTAL);
158 AR_ATOI(hdr->ar_size, chdr.size, sizeof(hdr->ar_size), DECIMAL);
160 /* Leading spaces should never happen. */
161 if (hdr->ar_name[0] == ' ')
165 * Long name support. Set the "real" size of the file, and the
166 * long name flag/size.
168 if (!bcmp(hdr->ar_name, AR_EFMT1, sizeof(AR_EFMT1) - 1)) {
169 chdr.lname = len = atoi(hdr->ar_name + sizeof(AR_EFMT1) - 1);
170 if (len <= 0 || len > MAXNAMLEN)
172 nr = read(fd, chdr.name, len);
182 memmove(chdr.name, hdr->ar_name, sizeof(hdr->ar_name));
184 /* Strip trailing spaces, null terminate. */
185 for (p = chdr.name + sizeof(hdr->ar_name) - 1; *p == ' '; --p);
191 static int already_written;
195 * Write an archive member to a file.
208 * If passed an sb structure, reading a file from disk. Get stat(2)
209 * information, build a name and construct a header. (Files are named
210 * by their last component in the archive.) If not, then just write
211 * the last header read.
214 name = basename(cfp->rname);
215 (void)fstat(cfp->rfd, sb);
218 * If not truncating names and the name is too long or contains
219 * a space, use extended format 1.
221 lname = strlen(name);
222 if (options & AR_TR) {
223 if (lname > OLDARMAXNAME) {
224 (void)fflush(stdout);
225 warnx("warning: %s truncated to %.*s",
226 name, OLDARMAXNAME, name);
227 (void)fflush(stderr);
229 (void)sprintf(hb, HDR3, name,
230 (long)sb->st_mtimespec.tv_sec, sb->st_uid,
231 sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
233 } else if (lname > sizeof(hdr->ar_name) || strchr(name, ' '))
234 (void)sprintf(hb, HDR1, AR_EFMT1, lname,
235 (long)sb->st_mtimespec.tv_sec, sb->st_uid,
236 sb->st_gid, sb->st_mode, sb->st_size + lname,
240 (void)sprintf(hb, HDR2, name,
241 (long)sb->st_mtimespec.tv_sec, sb->st_uid,
242 sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
251 if (write(cfp->wfd, hb, sizeof(HDR)) != sizeof(HDR))
254 if (write(cfp->wfd, name, lname) != lname)
256 already_written = lname;
264 * Copy size bytes from one file to another - taking care to handle the
265 * extra byte (for odd size files) when reading archives and writing an
266 * extra byte if necessary when adding files to archive. The length of
267 * the object is the long name plus the object itself; the variable
268 * already_written gets set if a long name was written.
270 * The padding is really unnecessary, and is almost certainly a remnant
271 * of early archive formats where the header included binary data which
272 * a PDP-11 required to start on an even byte boundary. (Or, perhaps,
273 * because 16-bit word addressed copies were faster?) Anyhow, it should
274 * have been ripped out long ago.
281 static char pad = '\n';
283 int from, nr = 0, nw, off, to;
292 while (sz && (nr = read(from, buf, MIN(sz, sizeof(buf)))) > 0) {
294 for (off = 0; off < nr; nr -= off, off += nw)
295 if ((nw = write(to, buf + off, nr)) < 0)
304 if (cfp->flags & RPAD && (size + chdr.lname) & 1 &&
305 (nr = read(from, buf, 1)) != 1) {
310 if (cfp->flags & WPAD && (size + already_written) & 1 &&
311 write(to, &pad, 1) != 1)
317 * Skip over an object -- taking care to skip the pad bytes.
325 len = chdr.size + ( (chdr.size + chdr.lname) & 1);
326 if (lseek(fd, len, SEEK_CUR) == (off_t)-1)