MultiSource/Benchmarks/MallocBench/make/arscan.c - native_client/pnacl-llvm-testsuite - Git at Google

 /* Library function for scanning an archive file.
    Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2, or (at your option)
    any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */

 /* On the sun386i and in System V rel 3, ar.h defines two different archive
    formats depending upon whether you have defined PORTAR (normal) or PORT5AR
    (System V Release 1).  There is no default, one or the other must be defined
    to have a nonzero value.  */

 #if (defined(sun386) || defined(USGr3) || defined(HPUX) \
      && !defined(PORTAR) && !defined(PORT5AR))
 #define PORTAR 1
 #endif

 #include <ar.h>
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <errno.h>

 #if	defined (USG) || defined (POSIX)
 #include <fcntl.h>
 #else
 #include <sys/file.h>
 #endif

 #if	(defined(STDC_HEADERS) || defined(__GNU_LIBRARY__) || \
 	   defined(POSIX)) || defined(__FreeBSD__) || defined(__OpenBSD__) || \
      defined(__APPLE__)
 #include <stdlib.h>
 #include <string.h>
 #define	ANSI_STRING
 #else	/* No standard headers.  */

 #ifdef	USG

 #include <string.h>
 #include <memory.h>
 #define	ANSI_STRING

 #else	/* Not USG.  */
 #include <strings.h>

 #ifndef	bcmp
 extern int bcmp ();
 #endif
 #ifndef	bzero
 extern void bzero ();
 #endif
 #ifndef	bcopy
 extern void bcopy ();
 #endif

 #endif	/* USG.  */

 extern char *malloc (), *realloc ();
 extern void free ();

 #endif	/* Standard headers.  */

 #ifdef	ANSI_STRING
 #define	index(s, c)	strchr((s), (c))
 #define	rindex(s, c)	strrchr((s), (c))

 #define bcmp(s1, s2, n)	memcmp ((s1), (s2), (n))
 #define bzero(s, n)	memset ((s), 0, (n))
 #define bcopy(s, d, n)	memcpy ((d), (s), (n))
 #endif	/*ANSI_STRING*/
 #undef	ANSI_STRING


 #ifndef	AIAMAG
 #if	(defined(APOLLO) || defined(HPUX) || defined(hpux) || \
 	 (PORTAR == 1 && (defined(USGr3) || defined(u3b2) || defined(sun386))))
 #define	AR_NAMELEN	14
 #define	AR_TRAILING_SLASH	/* Member names have a trailing slash.  */
 #else
 #define	AR_NAMELEN	15
 #endif
 #else	/* AIX.  */
 #define	AR_NAMELEN	255
 #endif

 #if	defined(__GNU_LIBRARY__) || defined(POSIX) || defined(_IBMR2) || \
     defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
 #include <unistd.h>
 #else
 extern int read (), open (), close (), write (), fstat ();
 extern long int lseek (), atol ();
 extern int atoi ();
 #endif

 /* Takes three arguments ARCHIVE, FUNCTION and ARG.

    Open the archive named ARCHIVE, find its members one by one,
    and for each one call FUNCTION with the following arguments:
      archive file descriptor for reading the data,
      member name,
      member header position in file,
      member data position in file,
      member data size,
      member date,
      member uid,
      member gid,
      member protection mode,
      ARG.

    The descriptor is poised to read the data of the member
    when FUNCTION is called.  It does not matter how much
    data FUNCTION reads.

    If FUNCTION returns nonzero, we immediately return
    what FUNCTION returned.

    Returns -1 if archive does not exist,
    Returns -2 if archive has invalid format.
    Returns 0 if have scanned successfully.  */

 long int
 ar_scan (archive, function, arg)
      char *archive;
      long int (*function) ();
      long int arg;
 {
 #ifdef AIAMAG
   FL_HDR fl_header;
 #endif
   register int desc = open (archive, O_RDONLY, 0);
   if (desc < 0)
     return -1;
 #ifdef SARMAG
   {
     char buf[SARMAG];
     register int nread = read (desc, buf, SARMAG);
     if (nread != SARMAG || bcmp (buf, ARMAG, SARMAG))
       {
 	(void) close (desc);
 	return -2;
       }
   }
 #else
 #ifdef AIAMAG
   {
     register int nread = read (desc, &fl_header, FL_HSZ);
     if (nread != FL_HSZ || bcmp (fl_header.fl_magic, AIAMAG, SAIAMAG))
       {
 	(void) close (desc);
 	return -2;
       }
   }
 #else
   {
 #ifndef M_XENIX
     int buf;
 #else
     unsigned short int buf;
 #endif
     register int nread = read(desc, &buf, sizeof (buf));
     if (nread != sizeof (buf) || buf != ARMAG)
       {
 	(void) close (desc);
 	return -2;
       }
   }
 #endif
 #endif

   /* Now find the members one by one.  */
   {
 #ifdef SARMAG
     register long int member_offset = SARMAG;
 #else
 #ifdef AIAMAG
     long int member_offset;
     long int last_member_offset;

     sscanf (fl_header.fl_fstmoff, "%12ld", &member_offset);
     sscanf (fl_header.fl_lstmoff, "%12ld", &last_member_offset);
 #else
 #ifndef	M_XENIX
     register long int member_offset = sizeof (int);
 #else	/* Xenix.  */
     register long int member_offset = sizeof (unsigned short int);
 #endif	/* Not Xenix.  */
 #endif
 #endif

     while (1)
       {
 	register int nread;
 	struct ar_hdr member_header;
 #ifdef AIAMAG
 	char name[AR_NAMELEN + 1];
 	int name_len;
 	long int dateval;
 	int uidval, gidval;
 	long int data_offset;
 #else
 	char name[sizeof member_header.ar_name + 1];
 #endif
 	long int eltsize;
 	int eltmode;
 	long int fnval;

 	if (lseek (desc, member_offset, 0) < 0)
 	  {
 	    (void) close (desc);
 	    return -2;
 	  }

 #ifdef AIAMAG
 #define	AR_MEMHDR	\
 	(sizeof (member_header) - sizeof (member_header._ar_name))
 	nread = read (desc, (char *) &member_header, AR_MEMHDR);

 	if (nread != AR_MEMHDR)
 	  {
 	    (void) close (desc);
 	    return -2;
 	  }

 	sscanf (member_header.ar_namlen, "%4d", &name_len);
 	nread = read (desc, name, name_len);

 	if (nread != name_len)
 	  {
 	    (void) close (desc);
 	    return -2;
 	  }

 	name[name_len] = 0;

 	sscanf (member_header.ar_date, "%12ld", &dateval);
 	sscanf (member_header.ar_uid, "%12d", &uidval);
 	sscanf (member_header.ar_gid, "%12d", &gidval);
 	sscanf (member_header.ar_mode, "%12o", &eltmode);
 	sscanf (member_header.ar_size, "%12ld", &eltsize);

 	if ((data_offset = member_offset + AR_MEMHDR + name_len + 2) % 2)
 	    ++data_offset;

 	fnval =
 	  (*function) (desc, name, member_offset, data_offset, eltsize,
 		       dateval, uidval, gidval,
 		       eltmode, arg);

 #else
 	nread = read (desc, (char *) &member_header, sizeof (struct ar_hdr));
 	if (nread == 0)
 	  /* No data left means end of file; that is OK.  */
 	  break;

 	if (nread != sizeof (member_header)
 #ifdef ARFMAG
 	    || bcmp (member_header.ar_fmag, ARFMAG, 2)
 #endif
 	    )
 	  {
 	    (void) close (desc);
 	    return -2;
 	  }

 	bcopy (member_header.ar_name, name, sizeof member_header.ar_name);
 	{
 	  register char *p = name + sizeof member_header.ar_name;
 	  while (p > name && *--p == ' ')
 	    *p = '\0';
 #ifdef	AR_TRAILING_SLASH
 	  if (*p == '/')
 	    *p = '\0';
 #endif
 	}

 #ifndef	M_XENIX
 	sscanf (member_header.ar_mode, "%o", &eltmode);
 	eltsize = atol (member_header.ar_size);
 #else	/* Xenix.  */
 	eltmode = (unsigned short int) member_header.ar_mode;
 	eltsize = member_header.ar_size;
 #endif	/* Not Xenix.  */

 	fnval =
 	  (*function) (desc, name, member_offset,
 		       member_offset + sizeof (member_header), eltsize,
 #ifndef	M_XENIX
 		       atol (member_header.ar_date),
 		       atoi (member_header.ar_uid),
 		       atoi (member_header.ar_gid),
 #else	/* Xenix.  */
 		       member_header.ar_date,
 		       member_header.ar_uid,
 		       member_header.ar_gid,
 #endif	/* Not Xenix.  */
 		       eltmode, arg);

 #endif  /* Not AIAMAG */

 	if (fnval)
 	  {
 	    (void) close (desc);
 	    return fnval;
 	  }

 #ifdef AIAMAG
 	if (member_offset == last_member_offset) /* end of chain? */
 	    break;

 	sscanf (member_header.ar_nxtmem, "%12ld", &member_offset);

 	if (lseek (desc, member_offset, 0) != member_offset)
 	  {
 	    (void) close (desc);
 	    return -2;
 	  }
 #else
 	member_offset += sizeof (member_header) + eltsize;
 	if (member_offset & 1) member_offset++;
 #endif
       }
   }

   close (desc);
   return 0;
 }

 /* Return nonzero iff NAME matches MEM.  If NAME is longer than
    sizeof (struct ar_hdr.ar_name), MEM may be the truncated version.  */

 int
 ar_name_equal (name, mem)
      char *name, *mem;
 {
   char *p;

   p = rindex (name, '/');
   if (p != 0)
     name = p + 1;

 #ifndef	APOLLO

   if (!strncmp (name, mem, AR_NAMELEN))
     return 1;

   if (!strncmp (name, mem, AR_NAMELEN - 2))
     {
       unsigned int namelen, memlen;

       namelen = strlen (name);
       memlen = strlen (mem);

       if (memlen == AR_NAMELEN
 	  && mem[AR_NAMELEN - 2] == '.' && mem[AR_NAMELEN - 1] == 'o'
 	  && name[namelen - 2] == '.' && name[namelen -1] == 'o')
 	return 1;
     }
   return 0;

 #else	/* APOLLO.  */
   return !strcmp (name, mem);
 #endif
 }

 /* ARGSUSED */
 static long int
 ar_member_pos (desc, mem, hdrpos, datapos, size, date, uid, gid, mode, name)
      int desc;
      char *mem;
      long int hdrpos, datapos, size, date;
      int uid, gid, mode;
      char *name;
 {
   if (!ar_name_equal (name, mem))
     return 0;
   return hdrpos;
 }

 /* Set date of member MEMNAME in archive ARNAME to current time.
    Returns 0 if successful,
    -1 if file ARNAME does not exist,
    -2 if not a valid archive,
    -3 if other random system call error (including file read-only),
    1 if valid but member MEMNAME does not exist.  */

 int
 ar_member_touch (arname, memname)
      char *arname, *memname;
 {
   register long int pos = ar_scan (arname, ar_member_pos, (long int) memname);
   register int fd;
   struct ar_hdr ar_hdr;
   register int i;
   struct stat statbuf;

   if (pos < 0)
     return (int) pos;
   if (!pos)
     return 1;

   fd = open (arname, O_RDWR, 0666);
   if (fd < 0)
     return -3;
   /* Read in this member's header */
   if (lseek (fd, pos, 0) < 0)
     goto lose;
   if (sizeof ar_hdr != read (fd, (char *) &ar_hdr, sizeof ar_hdr))
     goto lose;
   /* Write back the header, thus touching the archive file.  */
   if (lseek (fd, pos, 0) < 0)
     goto lose;
   if (sizeof ar_hdr != write (fd, (char *) &ar_hdr, sizeof ar_hdr))
     goto lose;
   /* The file's mtime is the time we we want.  */
   fstat (fd, &statbuf);
 #if defined(ARFMAG) || defined(AIAMAG)
   /* Advance member's time to that time */
   for (i = 0; i < sizeof ar_hdr.ar_date; i++)
     ar_hdr.ar_date[i] = ' ';
   sprintf (ar_hdr.ar_date, "%ld", (long int) statbuf.st_mtime);
 #ifdef AIAMAG
   ar_hdr.ar_date[strlen(ar_hdr.ar_date)] = ' ';
 #endif
 #else
   ar_hdr.ar_date = statbuf.st_mtime;
 #endif
   /* Write back this member's header */
   if (lseek (fd, pos, 0) < 0)
     goto lose;
   if (sizeof ar_hdr != write (fd, (char *) &ar_hdr, sizeof ar_hdr))
     goto lose;
   close (fd);
   return 0;

  lose:
   i = errno;
   close (fd);
   errno = i;
   return -3;
 }

 #ifdef TEST

 long int
 describe_member (desc, name, hdrpos, datapos, size, date, uid, gid, mode)
      int desc;
      char *name;
      long int hdrpos, datapos, size, date;
      int uid, gid, mode;
 {
   extern char *ctime ();

   printf ("Member %s: %ld bytes at %ld (%ld).\n", name, size, hdrpos, datapos);
   printf ("  Date %s", ctime (&date));
   printf ("  uid = %d, gid = %d, mode = 0%o.\n", uid, gid, mode);

   return 0;
 }

 main (argc, argv)
      int argc;
      char **argv;
 {
   ar_scan (argv[1], describe_member);
   return 0;
 }

 #endif	/* TEST.  */
	/* Library function for scanning an archive file.
	Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc.

	This program is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 2, or (at your option)
	any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to the Free Software
	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

	/* On the sun386i and in System V rel 3, ar.h defines two different archive
	formats depending upon whether you have defined PORTAR (normal) or PORT5AR
	(System V Release 1). There is no default, one or the other must be defined
	to have a nonzero value. */

	#if (defined(sun386) \|\| defined(USGr3) \|\| defined(HPUX) \
	&& !defined(PORTAR) && !defined(PORT5AR))
	#define PORTAR 1
	#endif

	#include <ar.h>
	#include <stdio.h>
	#include <sys/types.h>
	#include <sys/stat.h>
	#include <errno.h>

	#if defined (USG) \|\| defined (POSIX)
	#include <fcntl.h>
	#else
	#include <sys/file.h>
	#endif

	#if (defined(STDC_HEADERS) \|\| defined(__GNU_LIBRARY__) \|\| \
	defined(POSIX)) \|\| defined(__FreeBSD__) \|\| defined(__OpenBSD__) \|\| \
	defined(__APPLE__)
	#include <stdlib.h>
	#include <string.h>
	#define ANSI_STRING
	#else /* No standard headers. */

	#ifdef USG

	#include <string.h>
	#include <memory.h>
	#define ANSI_STRING

	#else /* Not USG. */
	#include <strings.h>

	#ifndef bcmp
	extern int bcmp ();
	#endif
	#ifndef bzero
	extern void bzero ();
	#endif
	#ifndef bcopy
	extern void bcopy ();
	#endif

	#endif /* USG. */

	extern char malloc (), realloc ();
	extern void free ();

	#endif /* Standard headers. */

	#ifdef ANSI_STRING
	#define index(s, c) strchr((s), (c))
	#define rindex(s, c) strrchr((s), (c))

	#define bcmp(s1, s2, n) memcmp ((s1), (s2), (n))
	#define bzero(s, n) memset ((s), 0, (n))
	#define bcopy(s, d, n) memcpy ((d), (s), (n))
	#endif /ANSI_STRING/
	#undef ANSI_STRING


	#ifndef AIAMAG
	#if (defined(APOLLO) \|\| defined(HPUX) \|\| defined(hpux) \|\| \
	(PORTAR == 1 && (defined(USGr3) \|\| defined(u3b2) \|\| defined(sun386))))
	#define AR_NAMELEN 14
	#define AR_TRAILING_SLASH /* Member names have a trailing slash. */
	#else
	#define AR_NAMELEN 15
	#endif
	#else /* AIX. */
	#define AR_NAMELEN 255
	#endif

	#if defined(__GNU_LIBRARY__) \|\| defined(POSIX) \|\| defined(_IBMR2) \|\| \
	defined(__FreeBSD__) \|\| defined(__OpenBSD__) \|\| defined(__APPLE__)
	#include <unistd.h>
	#else
	extern int read (), open (), close (), write (), fstat ();
	extern long int lseek (), atol ();
	extern int atoi ();
	#endif

	/* Takes three arguments ARCHIVE, FUNCTION and ARG.

	Open the archive named ARCHIVE, find its members one by one,
	and for each one call FUNCTION with the following arguments:
	archive file descriptor for reading the data,
	member name,
	member header position in file,
	member data position in file,
	member data size,
	member date,
	member uid,
	member gid,
	member protection mode,
	ARG.

	The descriptor is poised to read the data of the member
	when FUNCTION is called. It does not matter how much
	data FUNCTION reads.

	If FUNCTION returns nonzero, we immediately return
	what FUNCTION returned.

	Returns -1 if archive does not exist,
	Returns -2 if archive has invalid format.
	Returns 0 if have scanned successfully. */

	long int
	ar_scan (archive, function, arg)
	char *archive;
	long int (*function) ();
	long int arg;
	{
	#ifdef AIAMAG
	FL_HDR fl_header;
	#endif
	register int desc = open (archive, O_RDONLY, 0);
	if (desc < 0)
	return -1;
	#ifdef SARMAG
	{
	char buf[SARMAG];
	register int nread = read (desc, buf, SARMAG);
	if (nread != SARMAG \|\| bcmp (buf, ARMAG, SARMAG))
	{
	(void) close (desc);
	return -2;
	}
	}
	#else
	#ifdef AIAMAG
	{
	register int nread = read (desc, &fl_header, FL_HSZ);
	if (nread != FL_HSZ \|\| bcmp (fl_header.fl_magic, AIAMAG, SAIAMAG))
	{
	(void) close (desc);
	return -2;
	}
	}
	#else
	{
	#ifndef M_XENIX
	int buf;
	#else
	unsigned short int buf;
	#endif
	register int nread = read(desc, &buf, sizeof (buf));
	if (nread != sizeof (buf) \|\| buf != ARMAG)
	{
	(void) close (desc);
	return -2;
	}
	}
	#endif
	#endif

	/* Now find the members one by one. */
	{
	#ifdef SARMAG
	register long int member_offset = SARMAG;
	#else
	#ifdef AIAMAG
	long int member_offset;
	long int last_member_offset;

	sscanf (fl_header.fl_fstmoff, "%12ld", &member_offset);
	sscanf (fl_header.fl_lstmoff, "%12ld", &last_member_offset);
	#else
	#ifndef M_XENIX
	register long int member_offset = sizeof (int);
	#else /* Xenix. */
	register long int member_offset = sizeof (unsigned short int);
	#endif /* Not Xenix. */
	#endif
	#endif

	while (1)
	{
	register int nread;
	struct ar_hdr member_header;
	#ifdef AIAMAG
	char name[AR_NAMELEN + 1];
	int name_len;
	long int dateval;
	int uidval, gidval;
	long int data_offset;
	#else
	char name[sizeof member_header.ar_name + 1];
	#endif
	long int eltsize;
	int eltmode;
	long int fnval;

	if (lseek (desc, member_offset, 0) < 0)
	{
	(void) close (desc);
	return -2;
	}

	#ifdef AIAMAG
	#define AR_MEMHDR \
	(sizeof (member_header) - sizeof (member_header._ar_name))
	nread = read (desc, (char *) &member_header, AR_MEMHDR);

	if (nread != AR_MEMHDR)
	{
	(void) close (desc);
	return -2;
	}

	sscanf (member_header.ar_namlen, "%4d", &name_len);
	nread = read (desc, name, name_len);

	if (nread != name_len)
	{
	(void) close (desc);
	return -2;
	}

	name[name_len] = 0;

	sscanf (member_header.ar_date, "%12ld", &dateval);
	sscanf (member_header.ar_uid, "%12d", &uidval);
	sscanf (member_header.ar_gid, "%12d", &gidval);
	sscanf (member_header.ar_mode, "%12o", &eltmode);
	sscanf (member_header.ar_size, "%12ld", &eltsize);

	if ((data_offset = member_offset + AR_MEMHDR + name_len + 2) % 2)
	++data_offset;

	fnval =
	(*function) (desc, name, member_offset, data_offset, eltsize,
	dateval, uidval, gidval,
	eltmode, arg);

	#else
	nread = read (desc, (char *) &member_header, sizeof (struct ar_hdr));
	if (nread == 0)
	/* No data left means end of file; that is OK. */
	break;

	if (nread != sizeof (member_header)
	#ifdef ARFMAG
	\|\| bcmp (member_header.ar_fmag, ARFMAG, 2)
	#endif
	)
	{
	(void) close (desc);
	return -2;
	}

	bcopy (member_header.ar_name, name, sizeof member_header.ar_name);
	{
	register char *p = name + sizeof member_header.ar_name;
	while (p > name && *--p == ' ')
	*p = '\0';
	#ifdef AR_TRAILING_SLASH
	if (*p == '/')
	*p = '\0';
	#endif
	}

	#ifndef M_XENIX
	sscanf (member_header.ar_mode, "%o", &eltmode);
	eltsize = atol (member_header.ar_size);
	#else /* Xenix. */
	eltmode = (unsigned short int) member_header.ar_mode;
	eltsize = member_header.ar_size;
	#endif /* Not Xenix. */

	fnval =
	(*function) (desc, name, member_offset,
	member_offset + sizeof (member_header), eltsize,
	#ifndef M_XENIX
	atol (member_header.ar_date),
	atoi (member_header.ar_uid),
	atoi (member_header.ar_gid),
	#else /* Xenix. */
	member_header.ar_date,
	member_header.ar_uid,
	member_header.ar_gid,
	#endif /* Not Xenix. */
	eltmode, arg);

	#endif /* Not AIAMAG */

	if (fnval)
	{
	(void) close (desc);
	return fnval;
	}

	#ifdef AIAMAG
	if (member_offset == last_member_offset) /* end of chain? */
	break;

	sscanf (member_header.ar_nxtmem, "%12ld", &member_offset);

	if (lseek (desc, member_offset, 0) != member_offset)
	{
	(void) close (desc);
	return -2;
	}
	#else
	member_offset += sizeof (member_header) + eltsize;
	if (member_offset & 1) member_offset++;
	#endif
	}
	}

	close (desc);
	return 0;
	}

	/* Return nonzero iff NAME matches MEM. If NAME is longer than
	sizeof (struct ar_hdr.ar_name), MEM may be the truncated version. */

	int
	ar_name_equal (name, mem)
	char name, mem;
	{
	char *p;

	p = rindex (name, '/');
	if (p != 0)
	name = p + 1;

	#ifndef APOLLO

	if (!strncmp (name, mem, AR_NAMELEN))
	return 1;

	if (!strncmp (name, mem, AR_NAMELEN - 2))
	{
	unsigned int namelen, memlen;

	namelen = strlen (name);
	memlen = strlen (mem);

	if (memlen == AR_NAMELEN
	&& mem[AR_NAMELEN - 2] == '.' && mem[AR_NAMELEN - 1] == 'o'
	&& name[namelen - 2] == '.' && name[namelen -1] == 'o')
	return 1;
	}
	return 0;

	#else /* APOLLO. */
	return !strcmp (name, mem);
	#endif
	}

	/* ARGSUSED */
	static long int
	ar_member_pos (desc, mem, hdrpos, datapos, size, date, uid, gid, mode, name)
	int desc;
	char *mem;
	long int hdrpos, datapos, size, date;
	int uid, gid, mode;
	char *name;
	{
	if (!ar_name_equal (name, mem))
	return 0;
	return hdrpos;
	}

	/* Set date of member MEMNAME in archive ARNAME to current time.
	Returns 0 if successful,
	-1 if file ARNAME does not exist,
	-2 if not a valid archive,
	-3 if other random system call error (including file read-only),
	1 if valid but member MEMNAME does not exist. */

	int
	ar_member_touch (arname, memname)
	char arname, memname;
	{
	register long int pos = ar_scan (arname, ar_member_pos, (long int) memname);
	register int fd;
	struct ar_hdr ar_hdr;
	register int i;
	struct stat statbuf;

	if (pos < 0)
	return (int) pos;
	if (!pos)
	return 1;

	fd = open (arname, O_RDWR, 0666);
	if (fd < 0)
	return -3;
	/* Read in this member's header */
	if (lseek (fd, pos, 0) < 0)
	goto lose;
	if (sizeof ar_hdr != read (fd, (char *) &ar_hdr, sizeof ar_hdr))
	goto lose;
	/* Write back the header, thus touching the archive file. */
	if (lseek (fd, pos, 0) < 0)
	goto lose;
	if (sizeof ar_hdr != write (fd, (char *) &ar_hdr, sizeof ar_hdr))
	goto lose;
	/* The file's mtime is the time we we want. */
	fstat (fd, &statbuf);
	#if defined(ARFMAG) \|\| defined(AIAMAG)
	/* Advance member's time to that time */
	for (i = 0; i < sizeof ar_hdr.ar_date; i++)
	ar_hdr.ar_date[i] = ' ';
	sprintf (ar_hdr.ar_date, "%ld", (long int) statbuf.st_mtime);
	#ifdef AIAMAG
	ar_hdr.ar_date[strlen(ar_hdr.ar_date)] = ' ';
	#endif
	#else
	ar_hdr.ar_date = statbuf.st_mtime;
	#endif
	/* Write back this member's header */
	if (lseek (fd, pos, 0) < 0)
	goto lose;
	if (sizeof ar_hdr != write (fd, (char *) &ar_hdr, sizeof ar_hdr))
	goto lose;
	close (fd);
	return 0;

	lose:
	i = errno;
	close (fd);
	errno = i;
	return -3;
	}

	#ifdef TEST

	long int
	describe_member (desc, name, hdrpos, datapos, size, date, uid, gid, mode)
	int desc;
	char *name;
	long int hdrpos, datapos, size, date;
	int uid, gid, mode;
	{
	extern char *ctime ();

	printf ("Member %s: %ld bytes at %ld (%ld).\n", name, size, hdrpos, datapos);
	printf (" Date %s", ctime (&date));
	printf (" uid = %d, gid = %d, mode = 0%o.\n", uid, gid, mode);

	return 0;
	}

	main (argc, argv)
	int argc;
	char **argv;
	{
	ar_scan (argv[1], describe_member);
	return 0;
	}

	#endif /* TEST. */