sysdep.c

早期freebsd实现

getwd (pathname)
     char *pathname;
{
  char *npath, *spath;
  extern char *getcwd ();

  spath = npath = getcwd ((char *) 0, MAXPATHLEN);
  /* On Altos 3068, getcwd can return @hostname/dir, so discard
     up to first slash.  Should be harmless on other systems.  */
  while (*npath && *npath != '/')
    npath++;
  strcpy (pathname, npath);
  free (spath);			/* getcwd uses malloc */
  return pathname;
}

#endif HAVE_GETWD

#ifndef HAVE_RENAME

/*
 *	Emulate rename using unlink/link.  Note that this is
 *	only partially correct.  Also, doesn't enforce restriction
 *	that files be of same type (regular->regular, dir->dir, etc).
 */

rename (from, to)
     char *from;
     char *to;
{
  if (access (from, 0) == 0)
    {
      unlink (to);
      if (link (from, to) == 0)
	if (unlink (from) == 0)
	  return (0);
    }
  return (-1);
}
#endif /* not HAVE_RENAME */

/* VARARGS */
setpriority ()
{
  return (0);
}

#ifndef HAVE_VFORK

/*
 *	Substitute fork(2) for vfork(2) on USG flavors.
 */

vfork ()
{
  return (fork ());
}

#endif /* not HAVE_VFORK */

#ifdef MISSING_UTIMES

/* HPUX (among others) sets HAVE_TIMEVAL but does not implement utimes.  */

utimes ()
{
}
#endif

#ifdef IRIS_UTIME

/* The IRIS (3.5) has timevals, but uses sys V utime, and doesn't have the
   utimbuf structure defined anywhere but in the man page. */

struct utimbuf
 {
   long actime;
   long modtime;
 };

utimes (name, tvp)
     char *name;
     struct timeval tvp[];
{
  struct utimbuf utb;
  utb.actime  = tvp[0].tv_sec;
  utb.modtime = tvp[1].tv_sec;
  utime (name, &utb);
}
#endif /* IRIS_UTIME */


#if 0
#ifdef HPUX

/* HPUX curses library references perror, but as far as we know
   it won't be called.  Anyway this definition will do for now.  */

perror ()
{
}

#endif /* HPUX */
#endif /* 0 */

#ifndef HAVE_DUP2

/*
 *	Emulate BSD dup2(2).  First close newd if it already exists.
 *	Then, attempt to dup oldd.  If not successful, call dup2 recursively
 *	until we are, then close the unsuccessful ones.
 */

dup2 (oldd, newd)
     int oldd;
     int newd;
{
  register int fd;
  
  sys_close (newd);

#ifdef F_DUPFD
  fd = fcntl (oldd, F_DUPFD, newd);
  if (fd != newd)
    error ("cant dup2(%i,%i) : %s", oldd, newd, sys_errlist[errno]);
#else
  while ((fd = dup (oldd)) != newd)
    {
      dup2 (oldd, newd);
      sys_close (fd);
    }
#endif
}

#endif /* not HAVE_DUP2 */

/*
 *	Gettimeofday.  Simulate as much as possible.  Only accurate
 *	to nearest second.  Emacs doesn't use tzp so ignore it for now.
 *	Only needed when subprocesses are defined.
 */

#ifdef subprocesses
#ifndef HAVE_GETTIMEOFDAY
#ifdef HAVE_TIMEVAL
 
/* ARGSUSED */
gettimeofday (tp, tzp)
     struct timeval *tp;
     struct timezone *tzp;
{
  extern long time ();

  tp->tv_sec = time ((long *)0);    
  tp->tv_usec = 0;
}
 
#endif
#endif
#endif /* subprocess && !HAVE_GETTIMEOFDAY && HAVE_TIMEVAL */
  
/*
 *	This function will go away as soon as all the stubs fixed. (fnf)
 */

croak (badfunc)
     char *badfunc;
{
  printf ("%s not yet implemented\r\n", badfunc);
  reset_sys_modes ();
  exit (1);
}

#endif /* USG */

/* Directory routines for systems that don't have them. */

#ifdef SYSV_SYSTEM_DIR

#include <dirent.h>

#ifndef HAVE_CLOSEDIR
int
closedir (dirp)
     register DIR *dirp;              /* stream from opendir() */
{
  sys_close (dirp->dd_fd);
  free ((char *) dirp->dd_buf);       /* directory block defined in <dirent.h> */
  free ((char *) dirp);
}
#endif /* not HAVE_CLOSEDIR */

#endif /* SYSV_SYSTEM_DIR */

#ifdef NONSYSTEM_DIR_LIBRARY

DIR *
opendir (filename)
     char *filename;	/* name of directory */
{
  register DIR *dirp;		/* -> malloc'ed storage */
  register int fd;		/* file descriptor for read */
  struct stat sbuf;		/* result of fstat() */

  fd = sys_open (filename, 0);
  if (fd < 0)
    return 0;

  if (fstat (fd, &sbuf) < 0
      || (sbuf.st_mode & S_IFMT) != S_IFDIR
      || (dirp = (DIR *) malloc (sizeof (DIR))) == 0)
    {
      sys_close (fd);
      return 0;		/* bad luck today */
    }

  dirp->dd_fd = fd;
  dirp->dd_loc = dirp->dd_size = 0;	/* refill needed */

  return dirp;
}

void
closedir (dirp)
     register DIR *dirp;		/* stream from opendir() */
{
  sys_close (dirp->dd_fd);
  free ((char *) dirp);
}


#ifndef VMS
#define DIRSIZ	14
struct olddir
  {
    ino_t od_ino; 		/* inode */
    char od_name[DIRSIZ];	/* filename */
  };
#endif /* not VMS */

struct direct dir_static;	/* simulated directory contents */

/* ARGUSED */
struct direct *
readdir (dirp)
     register DIR *dirp;	/* stream from opendir() */
{
#ifndef VMS
  register struct olddir *dp;	/* -> directory data */
#else /* VMS */
  register struct dir$_name *dp; /* -> directory data */
  register struct dir$_version *dv; /* -> version data */
#endif /* VMS */

  for (; ;)
    {
      if (dirp->dd_loc >= dirp->dd_size)
	dirp->dd_loc = dirp->dd_size = 0;

      if (dirp->dd_size == 0 	/* refill buffer */
	  && (dirp->dd_size = sys_read (dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
	return 0;

#ifndef VMS
      dp = (struct olddir *) &dirp->dd_buf[dirp->dd_loc];
      dirp->dd_loc += sizeof (struct olddir);

      if (dp->od_ino != 0)	/* not deleted entry */
	{
	  dir_static.d_ino = dp->od_ino;
	  strncpy (dir_static.d_name, dp->od_name, DIRSIZ);
	  dir_static.d_name[DIRSIZ] = '\0';
	  dir_static.d_namlen = strlen (dir_static.d_name);
	  dir_static.d_reclen = sizeof (struct direct)
	    - MAXNAMLEN + 3
	      + dir_static.d_namlen - dir_static.d_namlen % 4;
	  return &dir_static;	/* -> simulated structure */
	}
#else /* VMS */
      dp = (struct dir$_name *) dirp->dd_buf;
      if (dirp->dd_loc == 0)
	dirp->dd_loc = (dp->dir$b_namecount&1) ? dp->dir$b_namecount + 1
	  : dp->dir$b_namecount;
      dv = (struct dir$_version *)&dp->dir$t_name[dirp->dd_loc];
      dir_static.d_ino = dv->dir$w_fid_num;
      dir_static.d_namlen = dp->dir$b_namecount;
      dir_static.d_reclen = sizeof (struct direct)
	- MAXNAMLEN + 3
	  + dir_static.d_namlen - dir_static.d_namlen % 4;
      strncpy (dir_static.d_name, dp->dir$t_name, dp->dir$b_namecount);
      dir_static.d_name[dir_static.d_namlen] = '\0';
      dirp->dd_loc = dirp->dd_size; /* only one record at a time */
      return &dir_static;
#endif /* VMS */
    }
}

#ifdef VMS
/* readdirver is just like readdir except it returns all versions of a file
   as separate entries.  */

/* ARGUSED */
struct direct *
readdirver (dirp)
     register DIR *dirp;	/* stream from opendir() */
{
  register struct dir$_name *dp; /* -> directory data */
  register struct dir$_version *dv; /* -> version data */

  if (dirp->dd_loc >= dirp->dd_size - sizeof (struct dir$_name))
    dirp->dd_loc = dirp->dd_size = 0;

  if (dirp->dd_size == 0 	/* refill buffer */
      && (dirp->dd_size = sys_read (dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ)) <= 0)
    return 0;

  dp = (struct dir$_name *) dirp->dd_buf;
  if (dirp->dd_loc == 0)
    dirp->dd_loc = (dp->dir$b_namecount & 1) ? dp->dir$b_namecount + 1
		   : dp->dir$b_namecount;
  dv = (struct dir$_version *) &dp->dir$t_name[dirp->dd_loc];
  strncpy (dir_static.d_name, dp->dir$t_name, dp->dir$b_namecount);
  sprintf (&dir_static.d_name[dp->dir$b_namecount], ";%d", dv->dir$w_version);
  dir_static.d_namlen = strlen (dir_static.d_name);
  dir_static.d_ino = dv->dir$w_fid_num;
  dir_static.d_reclen = sizeof (struct direct) - MAXNAMLEN + 3
			+ dir_static.d_namlen - dir_static.d_namlen % 4;
  dirp->dd_loc = ((char *) (++dv) - dp->dir$t_name);
  return &dir_static;
}

#endif /* VMS */

#endif /* NONSYSTEM_DIR_LIBRARY */

/* Functions for VMS */
#ifdef VMS
#include <pwd.h>
#include <acldef.h>
#include <chpdef.h>
#include <jpidef.h>

/* Return as a string the VMS error string pertaining to STATUS.
   Reuses the same static buffer each time it is called.  */

char *
vmserrstr (status)
     int status;		/* VMS status code */
{
  int bufadr[2];
  short len;
  static char buf[257];

  bufadr[0] = sizeof buf - 1;
  bufadr[1] = buf;
  if (! (SYS$GETMSG (status, &len, bufadr, 0x1, 0) & 1))
    return "untranslatable VMS error status";
  buf[len] = '\0';
  return buf;
}

#ifdef access
#undef access
  
/* The following is necessary because 'access' emulation by VMS C (2.0) does
 * not work correctly.  (It also doesn't work well in version 2.3.)
 */

#ifdef VMS4_4

#define DESCRIPTOR(name,string) struct dsc$descriptor_s name = \
	{ strlen(string), DSC$K_DTYPE_T, DSC$K_CLASS_S, string }

typedef union {
    struct {
	unsigned short s_buflen;
	unsigned short s_code;
	char *s_bufadr;
	unsigned short *s_retlenadr;
    } s;
    int end;
} item;
#define buflen s.s_buflen
#define code s.s_code
#define bufadr s.s_bufadr
#define retlenadr s.s_retlenadr

#define R_OK 4	/* test for read permission */
#define W_OK 2	/* test for write permission */
#define X_OK 1	/* test for execute (search) permission */
#define F_OK 0	/* test for presence of file */

int
sys_access (path, mode)
     char *path;
     int mode;
{
  static char *user = NULL;
  char dir_fn[512];

  /* translate possible directory spec into .DIR file name, so brain-dead
   * access() can treat the directory like a file.  */
  if (directory_file_name (path, dir_fn))
    path = dir_fn;
  
  if (mode == F_OK)
    return access (path, mode);
  if (user == NULL && (user = getenv ("USER")) == NULL)
    return -1;
  {
	int stat;
	int flags;
	int acces;
	int dummy;
	item itemlst[3];
	DESCRIPTOR(path_desc, path);
	DESCRIPTOR(user_desc, user);
 
	flags = 0;
	acces = 0;
	if ((mode & X_OK) && ((stat = access(path, mode)) < 0 || mode == X_OK))
	    return stat;
	if (mode & R_OK)
	    acces |= CHP$M_READ;
	if (mode & W_OK)
	    acces |= CHP$M_WRITE;
	itemlst[0].buflen = sizeof (int);
	itemlst[0].code = CHP$_FLAGS;
	itemlst[0].bufadr = &flags;
	itemlst[0].retlenadr = &dummy;
	itemlst[1].buflen = sizeof (int);
	itemlst[1].code = CHP$_ACCESS;
	itemlst[1].bufadr = &acces;
	itemlst[1].retlenadr = &dummy;
	itemlst[2].end = CHP$_END;
	stat = SYS$CHECK_ACCESS(&ACL$C_FILE, &path_desc, &user_desc, itemlst);
	return stat == SS$_NORMAL ? 0 : -1;
    }
}

#else /* not VMS4_4 */

#include <prvdef.h>
#define	ACE$M_WRITE	2
#define	ACE$C_KEYID	1

static unsigned short memid, grpid;
static unsigned int uic;

/* Called from init_sys_modes, so it happens not very often
   but at least each time Emacs is loaded.  */
sys_access_reinit ()
{
  uic = 0;
}

int
sys_access (filename, type)
     char * filename;
     int type;
{
  struct FAB fab;
  struct XABPRO xab;
  int status, prvmask[2], size, i, typecode, acl_controlled;
  unsigned int *aclptr, *aclend, aclbuf[60];

  /* Get UIC and GRP values for protection checking.  */
  if (uic == 0)
    {
      status = LIB$GETJPI (&JPI$_UIC, 0, 0, &uic, 0, 0);
      if (! (status & 1))
	return -1;
      memid = uic & 0xFFFF;
      grpid = uic >> 16;
    }

  if (type != 2)		/* not checking write access */
    return access (filename, type);

  /* Check write protection. */
    
#define	CHECKPRIV(bit)    (prvmask[bit / 32] & (1 << (bit % 32)))
#define	WRITEABLE(field)  (! ((xab.xab$w_pro >> field) & XAB$M_NOWRITE))

  /* Find privilege bits */
  status = sys$setprv (0, 0, 0, prvmask);
  if (! (status & 1))
    error ("Unable to find privileges: %s", vmserrstr (status));
  if (CHECKPRIV (PRV$V_BYPASS))
    return 0;			/* BYPASS enabled */
  fab = cc$rms_fab;
  fab.fab$b_fac = FAB$M_GET;
  fab.fab$l_fna = filename;
  fab.fab$b_fns = strlen (filename);
  fab.fab$l_xab = &xab;
  xab = cc$rms_xabpro;
  xab.xab$l_aclbuf = aclbuf;
  xab.xab$w_aclsiz = sizeof (aclbuf);
  status = sys$open (&fab, 0, 0);
  if (! (status & 1))
    return -1;
  sys$close (&fab, 0, 0);
  /* Check system access */
  if (CHECKPRIV (PRV$V_SYSPRV) && WRITEABLE (XAB$V_SYS))
    return 0;
  /* Check ACL entries, if any */
  acl_controlled = 0;
  if (xab.xab$w_acllen > 0)
    {
      aclptr = aclbuf;
      aclend = &aclbuf[xab.xab$w_acllen / 4];
      while (*aclptr && aclptr < aclend)
	{
	  size = (*aclptr & 0xff) / 4;
	  typecode = (*aclptr >> 8) & 0xff;
	  if (typecode == ACE$C_KEYID)
	    for (i = size - 1; i > 1; i--)
	      if (aclptr[i] == uic)
		{
		  acl_controlled = 1;
		  if (aclptr[1] & ACE$M_WRITE)
		    return 0;	/* Write access through ACL */
		}
	  aclptr = &aclptr[size];
	}
      if (acl_controlled)	/* ACL specified, prohibits write access */
	return -1;
    }
  /* No ACL entries specified, check normal protection */
  if (WRITEABLE (XAB$V_WLD))	/* World writeable */
    return 0;
  if (WRITEABLE (XAB$V_GRP) &&
      (unsigned short) (xab.xab$l_uic >> 16) == grpid)
    return 0;			/* Group writeable */
  if (WRITEABLE (XAB$V_OWN) &&
      (xab.xab$l_uic & 0xFFFF) == memid)
    return 0;			/* Owner writeable */

  return -1;	/* Not writeable */
}
#endif /* not VMS4_4 */
#endif /* access */
  
static char vtbuf[NAM$C_MAXRSS+1];

/* translate a vms file spec to a unix path */
char *
sys_translate_vms (vfile)
     char * vfile;
{
  char * p;
  char * targ;

  if (!vfile)
    return 0;

  targ = vtbuf;

  /* leading device or logical name is a root directory */
  if (p = strchr (vfile, ':'))
    {
      *t