freebsd-skq/usr.bin/ar/archive.c
1998-07-06 21:01:54 +00:00

328 lines
8.5 KiB
C

/*-
* Copyright (c) 1990, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Hugh Smith at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)archive.c 8.3 (Berkeley) 4/2/94";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <ar.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "archive.h"
#include "extern.h"
typedef struct ar_hdr HDR;
static char hb[sizeof(HDR) + 1]; /* real header */
int
open_archive(mode)
int mode;
{
int created, fd, nr;
char buf[SARMAG];
created = 0;
if (mode & O_CREAT) {
mode |= O_EXCL;
if ((fd = open(archive, mode, DEFFILEMODE)) >= 0) {
/* POSIX.2 puts create message on stderr. */
if (!(options & AR_C))
warnx("creating archive %s", archive);
created = 1;
goto opened;
}
if (errno != EEXIST)
error(archive);
mode &= ~O_EXCL;
}
if ((fd = open(archive, mode, DEFFILEMODE)) < 0)
error(archive);
/*
* Attempt to place a lock on the opened file - if we get an
* error then someone is already working on this library (or
* it's going across NFS).
*/
opened: if (flock(fd, LOCK_EX|LOCK_NB) && errno != EOPNOTSUPP)
error(archive);
/*
* If not created, O_RDONLY|O_RDWR indicates that it has to be
* in archive format.
*/
if (!created &&
((mode & O_ACCMODE) == O_RDONLY || (mode & O_ACCMODE) == O_RDWR)) {
if ((nr = read(fd, buf, SARMAG) != SARMAG)) {
if (nr >= 0)
badfmt();
error(archive);
} else if (bcmp(buf, ARMAG, SARMAG))
badfmt();
} else if (write(fd, ARMAG, SARMAG) != SARMAG)
error(archive);
return (fd);
}
void
close_archive(fd)
int fd;
{
(void)close(fd); /* Implicit unlock. */
}
/* Convert ar header field to an integer. */
#define AR_ATOI(from, to, len, base) { \
memmove(buf, from, len); \
buf[len] = '\0'; \
to = strtol(buf, (char **)NULL, base); \
}
/*
* get_arobj --
* read the archive header for this member
*/
int
get_arobj(fd)
int fd;
{
struct ar_hdr *hdr;
int len, nr;
char *p, buf[20];
nr = read(fd, hb, sizeof(HDR));
if (nr != sizeof(HDR)) {
if (!nr)
return (0);
if (nr < 0)
error(archive);
badfmt();
}
hdr = (struct ar_hdr *)hb;
if (strncmp(hdr->ar_fmag, ARFMAG, sizeof(ARFMAG) - 1))
badfmt();
/* Convert the header into the internal format. */
#define DECIMAL 10
#define OCTAL 8
AR_ATOI(hdr->ar_date, chdr.date, sizeof(hdr->ar_date), DECIMAL);
AR_ATOI(hdr->ar_uid, chdr.uid, sizeof(hdr->ar_uid), DECIMAL);
AR_ATOI(hdr->ar_gid, chdr.gid, sizeof(hdr->ar_gid), DECIMAL);
AR_ATOI(hdr->ar_mode, chdr.mode, sizeof(hdr->ar_mode), OCTAL);
AR_ATOI(hdr->ar_size, chdr.size, sizeof(hdr->ar_size), DECIMAL);
/* Leading spaces should never happen. */
if (hdr->ar_name[0] == ' ')
badfmt();
/*
* Long name support. Set the "real" size of the file, and the
* long name flag/size.
*/
if (!bcmp(hdr->ar_name, AR_EFMT1, sizeof(AR_EFMT1) - 1)) {
chdr.lname = len = atoi(hdr->ar_name + sizeof(AR_EFMT1) - 1);
if (len <= 0 || len > MAXNAMLEN)
badfmt();
nr = read(fd, chdr.name, len);
if (nr != len) {
if (nr < 0)
error(archive);
badfmt();
}
chdr.name[len] = 0;
chdr.size -= len;
} else {
chdr.lname = 0;
memmove(chdr.name, hdr->ar_name, sizeof(hdr->ar_name));
/* Strip trailing spaces, null terminate. */
for (p = chdr.name + sizeof(hdr->ar_name) - 1; *p == ' '; --p);
*++p = '\0';
}
return (1);
}
static int already_written;
/*
* put_arobj --
* Write an archive member to a file.
*/
void
put_arobj(cfp, sb)
CF *cfp;
struct stat *sb;
{
int lname;
char *name;
struct ar_hdr *hdr;
off_t size;
/*
* If passed an sb structure, reading a file from disk. Get stat(2)
* information, build a name and construct a header. (Files are named
* by their last component in the archive.) If not, then just write
* the last header read.
*/
if (sb) {
name = rname(cfp->rname);
(void)fstat(cfp->rfd, sb);
/*
* If not truncating names and the name is too long or contains
* a space, use extended format 1.
*/
lname = strlen(name);
if (options & AR_TR) {
if (lname > OLDARMAXNAME) {
(void)fflush(stdout);
warnx("warning: %s truncated to %.*s",
name, OLDARMAXNAME, name);
(void)fflush(stderr);
}
(void)sprintf(hb, HDR3, name,
(long)sb->st_mtimespec.tv_sec, sb->st_uid,
sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
lname = 0;
} else if (lname > sizeof(hdr->ar_name) || strchr(name, ' '))
(void)sprintf(hb, HDR1, AR_EFMT1, lname,
(long)sb->st_mtimespec.tv_sec, sb->st_uid,
sb->st_gid, sb->st_mode, sb->st_size + lname,
ARFMAG);
else {
lname = 0;
(void)sprintf(hb, HDR2, name,
(long)sb->st_mtimespec.tv_sec, sb->st_uid,
sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
}
size = sb->st_size;
} else {
lname = chdr.lname;
name = chdr.name;
size = chdr.size;
}
if (write(cfp->wfd, hb, sizeof(HDR)) != sizeof(HDR))
error(cfp->wname);
if (lname) {
if (write(cfp->wfd, name, lname) != lname)
error(cfp->wname);
already_written = lname;
}
copy_ar(cfp, size);
already_written = 0;
}
/*
* copy_ar --
* Copy size bytes from one file to another - taking care to handle the
* extra byte (for odd size files) when reading archives and writing an
* extra byte if necessary when adding files to archive. The length of
* the object is the long name plus the object itself; the variable
* already_written gets set if a long name was written.
*
* The padding is really unnecessary, and is almost certainly a remnant
* of early archive formats where the header included binary data which
* a PDP-11 required to start on an even byte boundary. (Or, perhaps,
* because 16-bit word addressed copies were faster?) Anyhow, it should
* have been ripped out long ago.
*/
void
copy_ar(cfp, size)
CF *cfp;
off_t size;
{
static char pad = '\n';
off_t sz;
int from, nr, nw, off, to;
char buf[8*1024];
if (!(sz = size))
return;
from = cfp->rfd;
to = cfp->wfd;
sz = size;
while (sz && (nr = read(from, buf, MIN(sz, sizeof(buf)))) > 0) {
sz -= nr;
for (off = 0; off < nr; nr -= off, off += nw)
if ((nw = write(to, buf + off, nr)) < 0)
error(cfp->wname);
}
if (sz) {
if (nr == 0)
badfmt();
error(cfp->rname);
}
if (cfp->flags & RPAD && (size + chdr.lname) & 1 &&
(nr = read(from, buf, 1)) != 1) {
if (nr == 0)
badfmt();
error(cfp->rname);
}
if (cfp->flags & WPAD && (size + already_written) & 1 &&
write(to, &pad, 1) != 1)
error(cfp->wname);
}
/*
* skip_arobj -
* Skip over an object -- taking care to skip the pad bytes.
*/
void
skip_arobj(fd)
int fd;
{
off_t len;
len = chdr.size + ( (chdr.size + chdr.lname) & 1);
if (lseek(fd, len, SEEK_CUR) == (off_t)-1)
error(archive);
}