[unix-history] / usr / src / usr.bin / ar / archive.c

/*-
 * Copyright (c) 1990 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.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)archive.c	5.7 (Berkeley) %G%";
#endif /* not lint */

#include <sys/param.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <dirent.h>
#include <ar.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "archive.h"
#include "extern.h"

extern CHDR chdr;			/* converted header */
extern char *archive;			/* archive name */

typedef struct ar_hdr HDR;
static char hb[sizeof(HDR) + 1];	/* real header */

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))
				(void)fprintf(stderr,
				    "ar: creating archive %s.\n", 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) { \
	bcopy(from, buf, len); \
	buf[len] = '\0'; \
	to = strtol(buf, (char **)NULL, base); \
}

/*
 * get_arobj --
 *	read the archive header for this member
 */
get_arobj(fd)
	int fd;
{
	struct ar_hdr *hdr;
	register int len, nr;
	register 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;
		bcopy(hdr->ar_name, chdr.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.
 */
put_arobj(cfp, sb)
	CF *cfp;
	struct stat *sb;
{
	register int lname;
	register 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);
				(void)fprintf(stderr,
				    "ar: warning: %s truncated to %.*s\n",
				    name, OLDARMAXNAME, name);
				(void)fflush(stderr);
			}
			(void)sprintf(hb, HDR3, name, sb->st_mtime, sb->st_uid,
			    sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
			lname = 0;
		} else if (lname > sizeof(hdr->ar_name) || index(name, ' '))
			(void)sprintf(hb, HDR1, AR_EFMT1, lname, sb->st_mtime,
			    sb->st_uid, sb->st_gid, sb->st_mode,
			    sb->st_size + lname, ARFMAG);
		else {
			lname = 0;
			(void)sprintf(hb, HDR2, name, sb->st_mtime, 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.
 */
copy_ar(cfp, size)
	CF *cfp;
	off_t size;
{
	static char pad = '\n';
	register off_t sz;
	register 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 & 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);
}
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
4f81e05f	12	static char sccsid[] = "@(#)archive.c 5.7 (Berkeley) %G%";
6276da5a KB	13	#endif /* not lint */
	14
	15	#include <sys/param.h>
6276da5a KB	16	#include <sys/stat.h>
	17	#include <fcntl.h>
	18	#include <unistd.h>
11dc4a38	19	#include <errno.h>
6276da5a	20	#include <dirent.h>
6276da5a	21	#include <ar.h>
11dc4a38	22	#include <stdio.h>
a862a678 KB	23	#include <stdlib.h>
a862a678 KB	24	#include <string.h>
6276da5a	25	#include "archive.h"
a862a678	26	#include "extern.h"
6276da5a	27
11dc4a38	28	extern CHDR chdr; /* converted header */
6276da5a KB	29	extern char archive; / archive name */
6276da5a KB	30
11dc4a38 KB	31	typedef struct ar_hdr HDR;
	32	static char hb[sizeof(HDR) + 1]; /* real header */
	33
6276da5a KB	34	open_archive(mode)
	35	int mode;
	36	{
	37	int created, fd, nr;
	38	char buf[SARMAG];
	39
	40	created = 0;
	41	if (mode & O_CREAT) {
	42	mode \|= O_EXCL;
	43	if ((fd = open(archive, mode, DEFFILEMODE)) >= 0) {
	44	/* POSIX.2 puts create message on stderr. */
	45	if (!(options & AR_C))
	46	(void)fprintf(stderr,
	47	"ar: creating archive %s.\n", archive);
	48	created = 1;
	49	goto opened;
	50	}
	51	if (errno != EEXIST)
	52	error(archive);
	53	mode &= ~O_EXCL;
	54	}
	55	if ((fd = open(archive, mode, DEFFILEMODE)) < 0)
	56	error(archive);
	57
	58	/*
	59	* Attempt to place a lock on the opened file - if we get an
11dc4a38 KB	60	* error then someone is already working on this library (or
11dc4a38 KB	61	* it's going across NFS).
6276da5a	62	*/
11dc4a38	63	opened: if (flock(fd, LOCK_EX\|LOCK_NB) && errno != EOPNOTSUPP)
6276da5a KB	64	error(archive);
	65
	66	/*
	67	* If not created, O_RDONLY\|O_RDWR indicates that it has to be
	68	* in archive format.
	69	*/
	70	if (!created &&
	71	((mode & O_ACCMODE) == O_RDONLY \|\| (mode & O_ACCMODE) == O_RDWR)) {
	72	if ((nr = read(fd, buf, SARMAG) != SARMAG)) {
	73	if (nr >= 0)
	74	badfmt();
	75	error(archive);
	76	} else if (bcmp(buf, ARMAG, SARMAG))
	77	badfmt();
	78	} else if (write(fd, ARMAG, SARMAG) != SARMAG)
	79	error(archive);
	80	return(fd);
	81	}
	82
a862a678	83	void
6276da5a KB	84	close_archive(fd)
	85	int fd;
	86	{
a862a678	87	(void)close(fd); /* Implicit unlock. */
6276da5a KB	88	}
6276da5a KB	89
11dc4a38 KB	90	/* Convert ar header field to an integer. */
	91	#define AR_ATOI(from, to, len, base) { \
	92	bcopy(from, buf, len); \
	93	buf[len] = '\0'; \
	94	to = strtol(buf, (char **)NULL, base); \
	95	}
	96
	97	/*
ce478bb7	98	* get_arobj --
11dc4a38 KB	99	* read the archive header for this member
11dc4a38 KB	100	*/
ce478bb7	101	get_arobj(fd)
11dc4a38 KB	102	int fd;
	103	{
	104	struct ar_hdr *hdr;
	105	register int len, nr;
	106	register char *p, buf[20];
	107
	108	nr = read(fd, hb, sizeof(HDR));
	109	if (nr != sizeof(HDR)) {
	110	if (!nr)
	111	return(0);
	112	if (nr < 0)
	113	error(archive);
	114	badfmt();
	115	}
	116
	117	hdr = (struct ar_hdr *)hb;
	118	if (strncmp(hdr->ar_fmag, ARFMAG, sizeof(ARFMAG) - 1))
	119	badfmt();
	120
	121	/* Convert the header into the internal format. */
	122	#define DECIMAL 10
	123	#define OCTAL 8
	124
	125	AR_ATOI(hdr->ar_date, chdr.date, sizeof(hdr->ar_date), DECIMAL);
	126	AR_ATOI(hdr->ar_uid, chdr.uid, sizeof(hdr->ar_uid), DECIMAL);
	127	AR_ATOI(hdr->ar_gid, chdr.gid, sizeof(hdr->ar_gid), DECIMAL);
	128	AR_ATOI(hdr->ar_mode, chdr.mode, sizeof(hdr->ar_mode), OCTAL);
	129	AR_ATOI(hdr->ar_size, chdr.size, sizeof(hdr->ar_size), DECIMAL);
	130
	131	/* Leading spaces should never happen. */
	132	if (hdr->ar_name[0] == ' ')
	133	badfmt();
	134
	135	/*
	136	* Long name support. Set the "real" size of the file, and the
	137	* long name flag/size.
	138	*/
	139	if (!bcmp(hdr->ar_name, AR_EFMT1, sizeof(AR_EFMT1) - 1)) {
	140	chdr.lname = len = atoi(hdr->ar_name + sizeof(AR_EFMT1) - 1);
	141	if (len <= 0 \|\| len > MAXNAMLEN)
	142	badfmt();
	143	nr = read(fd, chdr.name, len);
	144	if (nr != len) {
	145	if (nr < 0)
	146	error(archive);
	147	badfmt();
	148	}
	149	chdr.name[len] = 0;
	150	chdr.size -= len;
	151	} else {
	152	chdr.lname = 0;
	153	bcopy(hdr->ar_name, chdr.name, sizeof(hdr->ar_name));
	154
	155	/* Strip trailing spaces, null terminate. */
	156	for (p = chdr.name + sizeof(hdr->ar_name) - 1; *p == ' '; --p);
	157	*++p = '\0';
	158	}
	159	return(1);
	160	}
	161
	162	static int already_written;
	163
	164	/*
ce478bb7	165	* put_arobj --
11dc4a38 KB	166	* Write an archive member to a file.
11dc4a38 KB	167	*/
ce478bb7	168	put_arobj(cfp, sb)
11dc4a38 KB	169	CF *cfp;
	170	struct stat *sb;
	171	{
	172	register int lname;
	173	register char *name;
	174	struct ar_hdr *hdr;
	175	off_t size;
11dc4a38 KB	176
	177	/*
	178	* If passed an sb structure, reading a file from disk. Get stat(2)
	179	* information, build a name and construct a header. (Files are named
	180	* by their last component in the archive.) If not, then just write
	181	* the last header read.
	182	*/
	183	if (sb) {
	184	name = rname(cfp->rname);
	185	(void)fstat(cfp->rfd, sb);
	186
616b39cf KB	187	/*
	188	* If not truncating names and the name is too long or contains
	189	* a space, use extended format 1.
	190	*/
	191	lname = strlen(name);
4f81e05f	192	if (options & AR_TR) {
5504c5d3	193	if (lname > OLDARMAXNAME) {
a862a678 KB	194	(void)fflush(stdout);
a862a678 KB	195	(void)fprintf(stderr,
616b39cf	196	"ar: warning: %s truncated to %.*s\n",
5504c5d3	197	name, OLDARMAXNAME, name);
616b39cf KB	198	(void)fflush(stderr);
616b39cf KB	199	}
5504c5d3 KB	200	(void)sprintf(hb, HDR3, name, sb->st_mtime, sb->st_uid,
	201	sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
	202	lname = 0;
	203	} else if (lname > sizeof(hdr->ar_name) \|\| index(name, ' '))
	204	(void)sprintf(hb, HDR1, AR_EFMT1, lname, sb->st_mtime,
	205	sb->st_uid, sb->st_gid, sb->st_mode,
	206	sb->st_size + lname, ARFMAG);
	207	else {
11dc4a38 KB	208	lname = 0;
	209	(void)sprintf(hb, HDR2, name, sb->st_mtime, sb->st_uid,
	210	sb->st_gid, sb->st_mode, sb->st_size, ARFMAG);
	211	}
	212	size = sb->st_size;
	213	} else {
	214	lname = chdr.lname;
	215	name = chdr.name;
	216	size = chdr.size;
	217	}
	218
	219	if (write(cfp->wfd, hb, sizeof(HDR)) != sizeof(HDR))
	220	error(cfp->wname);
	221	if (lname) {
	222	if (write(cfp->wfd, name, lname) != lname)
	223	error(cfp->wname);
	224	already_written = lname;
	225	}
ce478bb7	226	copy_ar(cfp, size);
11dc4a38 KB	227	already_written = 0;
	228	}
	229
6276da5a	230	/*
ce478bb7	231	* copy_ar --
6276da5a	232	* Copy size bytes from one file to another - taking care to handle the
11dc4a38 KB	233	* extra byte (for odd size files) when reading archives and writing an
	234	* extra byte if necessary when adding files to archive. The length of
	235	* the object is the long name plus the object itself; the variable
	236	* already_written gets set if a long name was written.
6276da5a KB	237	*
	238	* The padding is really unnecessary, and is almost certainly a remnant
	239	* of early archive formats where the header included binary data which
11dc4a38 KB	240	* a PDP-11 required to start on an even byte boundary. (Or, perhaps,
	241	* because 16-bit word addressed copies were faster?) Anyhow, it should
	242	* have been ripped out long ago.
6276da5a	243	*/
ce478bb7	244	copy_ar(cfp, size)
6276da5a	245	CF *cfp;
11dc4a38	246	off_t size;
6276da5a	247	{
11dc4a38 KB	248	static char pad = '\n';
11dc4a38 KB	249	register off_t sz;
6276da5a	250	register int from, nr, nw, off, to;
11dc4a38	251	char buf[8*1024];
6276da5a	252
11dc4a38	253	if (!(sz = size))
6276da5a KB	254	return;
6276da5a KB	255
6276da5a KB	256	from = cfp->rfd;
6276da5a KB	257	to = cfp->wfd;
11dc4a38 KB	258	sz = size;
	259	while (sz && (nr = read(from, buf, MIN(sz, sizeof(buf)))) > 0) {
	260	sz -= nr;
6276da5a KB	261	for (off = 0; off < nr; nr -= off, off += nw)
	262	if ((nw = write(to, buf + off, nr)) < 0)
	263	error(cfp->wname);
	264	}
11dc4a38	265	if (sz) {
6276da5a KB	266	if (nr == 0)
	267	badfmt();
	268	error(cfp->rname);
	269	}
	270
11dc4a38 KB	271	if (cfp->flags & RPAD && size & 1 && (nr = read(from, buf, 1)) != 1) {
	272	if (nr == 0)
	273	badfmt();
	274	error(cfp->rname);
6276da5a	275	}
11dc4a38 KB	276	if (cfp->flags & WPAD && (size + already_written) & 1 &&
	277	write(to, &pad, 1) != 1)
	278	error(cfp->wname);
	279	}
	280
	281	/*
ce478bb7	282	* skip_arobj -
11dc4a38 KB	283	* Skip over an object -- taking care to skip the pad bytes.
11dc4a38 KB	284	*/
a862a678	285	void
ce478bb7	286	skip_arobj(fd)
11dc4a38 KB	287	int fd;
	288	{
	289	off_t len;
	290
	291	len = chdr.size + (chdr.size + chdr.lname & 1);
	292	if (lseek(fd, len, SEEK_CUR) == (off_t)-1)
	293	error(archive);
6276da5a	294	}