dist/bfd/vms-misc.c

/* vms-misc.c -- BFD back-end for VMS/VAX (openVMS/VAX) and
   EVAX (openVMS/Alpha) files.
   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
   2007, 2008, 2009, 2010  Free Software Foundation, Inc.

   Miscellaneous functions.

   Written by Klaus K"ampf (kkaempf (at) rmi.de)

   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 3 of the License, 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., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#if __STDC__
#include <stdarg.h>
#endif

#include "sysdep.h"
#include "bfd.h"
#include "bfdlink.h"
#include "libbfd.h"
#include "safe-ctype.h"

#ifdef VMS
#define __NEW_STARLET
#include <rms.h>
#include <unixlib.h>
#include <gen64def.h>
#include <starlet.h>
#define RME$C_SETRFM 0x00000001
#include <unistd.h>
#endif
#include <time.h>

#include "vms.h"
#include "vms/emh.h"

#if VMS_DEBUG
/* Debug functions.  */

/* Debug function for all vms extensions evaluates environment
   variable VMS_DEBUG for a numerical value on the first call all
   error levels below this value are printed:

   Levels:
   1	toplevel bfd calls (functions from the bfd vector)
   2	functions called by bfd calls
   ...
   9	almost everything

   Level is also indentation level. Indentation is performed
   if level > 0.  */

void
_bfd_vms_debug (int level, char *format, ...)
{
  static int min_level = -1;
  static FILE *output = NULL;
  char *eptr;
  va_list args;
  int abslvl = (level > 0) ? level : - level;

  if (min_level == -1)
    {
      if ((eptr = getenv ("VMS_DEBUG")) != NULL)
	{
	  min_level = atoi (eptr);
	  output = stderr;
	}
      else
	min_level = 0;
    }
  if (output == NULL)
    return;
  if (abslvl > min_level)
    return;

  while (--level > 0)
    fprintf (output, " ");
  va_start (args, format);
  vfprintf (output, format, args);
  fflush (output);
  va_end (args);
}

/* A debug function
   hex dump 'size' bytes starting at 'ptr'.  */

void
_bfd_hexdump (int level, unsigned char *ptr, int size, int offset)
{
  unsigned char *lptr = ptr;
  int count = 0;
  long start = offset;

  while (size-- > 0)
    {
      if ((count % 16) == 0)
	vms_debug (level, "%08lx:", start);
      vms_debug (-level, " %02x", *ptr++);
      count++;
      start++;
      if (size == 0)
	{
	  while ((count % 16) != 0)
	    {
	      vms_debug (-level, "   ");
	      count++;
	    }
	}
      if ((count % 16) == 0)
	{
	  vms_debug (-level, " ");
	  while (lptr < ptr)
	    {
	      vms_debug (-level, "%c", (*lptr < 32) ? '.' : *lptr);
	      lptr++;
	    }
	  vms_debug (-level, "\n");
	}
    }
  if ((count % 16) != 0)
    vms_debug (-level, "\n");
}
#endif


/* Copy sized string (string with fixed size) to new allocated area
   size is string size (size of record)  */

char *
_bfd_vms_save_sized_string (unsigned char *str, int size)
{
  char *newstr = bfd_malloc ((bfd_size_type) size + 1);

  if (newstr == NULL)
    return NULL;
  memcpy (newstr, (char *) str, (size_t) size);
  newstr[size] = 0;

  return newstr;
}

/* Copy counted string (string with size at first byte) to new allocated area
   ptr points to size byte on entry  */

char *
_bfd_vms_save_counted_string (unsigned char *ptr)
{
  int len = *ptr++;

  return _bfd_vms_save_sized_string (ptr, len);
}

/* Object output routines.   */

/* Begin new record.
   Write 2 bytes rectype and 2 bytes record length.  */

void
_bfd_vms_output_begin (struct vms_rec_wr *recwr, int rectype)
{
  vms_debug2 ((6, "_bfd_vms_output_begin (type %d)\n", rectype));

  /* Record must have been closed.  */
  BFD_ASSERT (recwr->size == 0);

  _bfd_vms_output_short (recwr, (unsigned int) rectype);

  /* Placeholder for length.  */
  _bfd_vms_output_short (recwr, 0);
}

/* Begin new sub-record.
   Write 2 bytes rectype, and 2 bytes record length.  */

void
_bfd_vms_output_begin_subrec (struct vms_rec_wr *recwr, int rectype)
{
  vms_debug2 ((6, "_bfd_vms_output_begin_subrec (type %d)\n", rectype));

  /* Subrecord must have been closed.  */
  BFD_ASSERT (recwr->subrec_offset == 0);

  /* Save start of subrecord offset.  */
  recwr->subrec_offset = recwr->size;

  /* Subrecord type.  */
  _bfd_vms_output_short (recwr, (unsigned int) rectype);

  /* Placeholder for length.  */
  _bfd_vms_output_short (recwr, 0);
}

/* Set record/subrecord alignment.   */

void
_bfd_vms_output_alignment (struct vms_rec_wr *recwr, int alignto)
{
  vms_debug2 ((6, "_bfd_vms_output_alignment (%d)\n", alignto));
  recwr->align = alignto;
}

/* Align the size of the current record (whose length is LENGTH).
   Warning: this obviously changes the record (and the possible subrecord)
   length.  */

static void
_bfd_vms_output_align (struct vms_rec_wr *recwr, unsigned int length)
{
  unsigned int real_size = recwr->size;
  unsigned int aligncount;

  /* Pad with 0 if alignment is required.  */
  aligncount = (recwr->align - (length % recwr->align)) % recwr->align;
  vms_debug2 ((6, "align: adding %d bytes\n", aligncount));
  while (aligncount-- > 0)
    recwr->buf[real_size++] = 0;

  recwr->size = real_size;
}

/* Ends current sub-record.  Set length field.  */

void
_bfd_vms_output_end_subrec (struct vms_rec_wr *recwr)
{
  int real_size = recwr->size;
  int length;

  /* Subrecord must be open.  */
  BFD_ASSERT (recwr->subrec_offset != 0);

  length = real_size - recwr->subrec_offset;

  if (length == 0)
    return;

  _bfd_vms_output_align (recwr, length);

  /* Put length to buffer.  */
  bfd_putl16 ((bfd_vma) (recwr->size - recwr->subrec_offset),
              recwr->buf + recwr->subrec_offset + 2);

  /* Close the subrecord.  */
  recwr->subrec_offset = 0;
}

/* Ends current record (and write it).  */

void
_bfd_vms_output_end (bfd *abfd, struct vms_rec_wr *recwr)
{
  vms_debug2 ((6, "_bfd_vms_output_end (size %u)\n", recwr->size));

  /* Subrecord must have been closed.  */
  BFD_ASSERT (recwr->subrec_offset == 0);

  if (recwr->size == 0)
    return;

  _bfd_vms_output_align (recwr, recwr->size);

  /* Write the length word.  */
  bfd_putl16 ((bfd_vma) recwr->size, recwr->buf + 2);

  /* File is open in undefined (UDF) format on VMS, but ultimately will be
     converted to variable length (VAR) format.  VAR format has a length
     word first which must be explicitly output in UDF format.  */
  /* So, first the length word.  */
  bfd_bwrite (recwr->buf + 2, 2, abfd);

  /* Align.  */
  if (recwr->size & 1)
    recwr->buf[recwr->size++] = 0;

  /* Then the record.  */
  bfd_bwrite (recwr->buf, (size_t) recwr->size, abfd);

  recwr->size = 0;
}

/* Check remaining buffer size.  Return what's left.  */

int
_bfd_vms_output_check (struct vms_rec_wr *recwr, int size)
{
  vms_debug2 ((6, "_bfd_vms_output_check (%d)\n", size));

  return (MAX_OUTREC_SIZE - (recwr->size + size + MIN_OUTREC_LUFT));
}

/* Output byte (8 bit) value.  */

void
_bfd_vms_output_byte (struct vms_rec_wr *recwr, unsigned int value)
{
  vms_debug2 ((6, "_bfd_vms_output_byte (%02x)\n", value));

  *(recwr->buf + recwr->size) = value;
  recwr->size += 1;
}

/* Output short (16 bit) value.  */

void
_bfd_vms_output_short (struct vms_rec_wr *recwr, unsigned int value)
{
  vms_debug2 ((6, "_bfd_vms_output_short (%04x)\n", value));

  bfd_putl16 ((bfd_vma) value & 0xffff, recwr->buf + recwr->size);
  recwr->size += 2;
}

/* Output long (32 bit) value.  */

void
_bfd_vms_output_long (struct vms_rec_wr *recwr, unsigned long value)
{
  vms_debug2 ((6, "_bfd_vms_output_long (%08lx)\n", value));

  bfd_putl32 ((bfd_vma) value, recwr->buf + recwr->size);
  recwr->size += 4;
}

/* Output quad (64 bit) value.  */

void
_bfd_vms_output_quad (struct vms_rec_wr *recwr, bfd_vma value)
{
  vms_debug2 ((6, "_bfd_vms_output_quad (%08lx)\n", (unsigned long)value));

  bfd_putl64 (value, recwr->buf + recwr->size);
  recwr->size += 8;
}

/* Output c-string as counted string.  */

void
_bfd_vms_output_counted (struct vms_rec_wr *recwr, const char *value)
{
  int len;

  vms_debug2 ((6, "_bfd_vms_output_counted (%s)\n", value));

  len = strlen (value);
  if (len == 0)
    {
      (*_bfd_error_handler) (_("_bfd_vms_output_counted called with zero bytes"));
      return;
    }
  if (len > 255)
    {
      (*_bfd_error_handler) (_("_bfd_vms_output_counted called with too many bytes"));
      return;
    }
  _bfd_vms_output_byte (recwr, (unsigned int) len & 0xff);
  _bfd_vms_output_dump (recwr, (const unsigned char *)value, len);
}

/* Output character area.  */

void
_bfd_vms_output_dump (struct vms_rec_wr *recwr, const unsigned char *data, int len)
{
  vms_debug2 ((6, "_bfd_vms_output_dump (%d)\n", len));

  if (len == 0)
    return;

  memcpy (recwr->buf + recwr->size, data, (size_t) len);
  recwr->size += len;
}

/* Output count bytes of value.  */

void
_bfd_vms_output_fill (struct vms_rec_wr *recwr, int value, int count)
{
  vms_debug2 ((6, "_bfd_vms_output_fill (val %02x times %d)\n", value, count));

  if (count == 0)
    return;
  memset (recwr->buf + recwr->size, value, (size_t) count);
  recwr->size += count;
}

#ifdef VMS
/* Convert the file to variable record length format. This is done
   using undocumented system call sys$modify().
   Pure VMS version.  */

static void
vms_convert_to_var (char * vms_filename)
{
  struct FAB fab = cc$rms_fab;

  fab.fab$l_fna = vms_filename;
  fab.fab$b_fns = strlen (vms_filename);
  fab.fab$b_fac = FAB$M_PUT;
  fab.fab$l_fop = FAB$M_ESC;
  fab.fab$l_ctx = RME$C_SETRFM;

  sys$open (&fab);

  fab.fab$b_rfm = FAB$C_VAR;

  sys$modify (&fab);
  sys$close (&fab);
}

static int
vms_convert_to_var_1 (char *filename, int type)
{
  if (type != DECC$K_FILE)
    return FALSE;
  vms_convert_to_var (filename);
  return TRUE;
}

/* Convert the file to variable record length format. This is done
   using undocumented system call sys$modify().
   Unix filename version.  */

int
_bfd_vms_convert_to_var_unix_filename (const char *unix_filename)
{
  if (decc$to_vms (unix_filename, &vms_convert_to_var_1, 0, 1) != 1)
    return FALSE;
  return TRUE;
}
#endif /* VMS */

/* Manufacture a VMS like time on a unix based system.
   stolen from obj-vms.c.  */

unsigned char *
get_vms_time_string (void)
{
  static unsigned char tbuf[18];
#ifndef VMS
  char *pnt;
  time_t timeb;

  time (& timeb);
  pnt = ctime (&timeb);
  pnt[3] = 0;
  pnt[7] = 0;
  pnt[10] = 0;
  pnt[16] = 0;
  pnt[24] = 0;
  sprintf ((char *) tbuf, "%2s-%3s-%s %s",
	   pnt + 8, pnt + 4, pnt + 20, pnt + 11);
#else
  struct
  {
    int Size;
    unsigned char *Ptr;
  } Descriptor;
  Descriptor.Size = 17;
  Descriptor.Ptr = tbuf;
  SYS$ASCTIM (0, &Descriptor, 0, 0);
#endif /* not VMS */

  vms_debug2 ((6, "vmstimestring:'%s'\n", tbuf));

  return tbuf;
}

/* Create module name from filename (ie, extract the basename and convert it
   in upper cases).  Works on both VMS and UNIX pathes.
   The result has to be free().  */

char *
vms_get_module_name (const char *filename, bfd_boolean upcase)
{
  char *fname, *fptr;
  const char *fout;

  /* Strip VMS path.  */
  fout = strrchr (filename, ']');
  if (fout == NULL)
    fout = strchr (filename, ':');
  if (fout != NULL)
    fout++;
  else
    fout = filename;

  /* Strip UNIX path.  */
  fptr = strrchr (fout, '/');
  if (fptr != NULL)
    fout = fptr + 1;

  fname = strdup (fout);

  /* Strip suffix.  */
  fptr = strrchr (fname, '.');
  if (fptr != 0)
    *fptr = 0;

  /* Convert to upper case and truncate at 31 characters.
     (VMS object file format restricts module name length to 31).  */
  fptr = fname;
  for (fptr = fname; *fptr != 0; fptr++)
    {
      if (*fptr == ';' || (fptr - fname) >= 31)
        {
          *fptr = 0;
          break;
        }
      if (upcase)
        *fptr = TOUPPER (*fptr);
    }
  return fname;
}

/* Compared to usual UNIX time_t, VMS time has less limits:
   -  64 bit (63 bits in fact as the MSB must be 0)
   -  100ns granularity
   -  epoch is Nov 17, 1858.
   Here has the constants and the routines used to convert VMS from/to UNIX time.
   The conversion routines don't assume 64 bits arithmetic.

   Here we assume that the definition of time_t is the UNIX one, ie integer
   type, expressing seconds since the epoch.  */

/* UNIX time granularity for VMS, ie 1s / 100ns.  */
#define VMS_TIME_FACTOR 10000000

/* Number of seconds since VMS epoch of the UNIX epoch.  */
#define VMS_TIME_OFFSET 3506716800U

/* Convert a VMS time to a unix time.  */

time_t
vms_time_to_time_t (unsigned int hi, unsigned int lo)
{
  unsigned int tmp;
  unsigned int rlo;
  int i;
  time_t res;

  /* First convert to seconds.  */
  tmp = hi % VMS_TIME_FACTOR;
  hi = hi / VMS_TIME_FACTOR;
  rlo = 0;
  for (i = 0; i < 4; i++)
    {
      tmp = (tmp << 8) | (lo >> 24);
      lo <<= 8;

      rlo = (rlo << 8) | (tmp / VMS_TIME_FACTOR);
      tmp %= VMS_TIME_FACTOR;
    }
  lo = rlo;

  /* Return 0 in case of overflow.  */
  if (hi > 1
      || (hi == 1 && lo >= VMS_TIME_OFFSET))
    return 0;

  /* Return 0 in case of underflow.  */
  if (hi == 0 && lo < VMS_TIME_OFFSET)
    return 0;

  res = lo - VMS_TIME_OFFSET;
  if (res <= 0)
    return 0;
  return res;
}

/* Convert a time_t to a VMS time.  */

void
vms_time_t_to_vms_time (time_t ut, unsigned int *hi, unsigned int *lo)
{
  unsigned short val[4];
  unsigned short tmp[4];
  unsigned int carry;
  int i;

  /* Put into val.  */
  val[0] = ut & 0xffff;
  val[1] = (ut >> 16) & 0xffff;
  val[2] = sizeof (ut) > 4 ? (ut >> 32) & 0xffff : 0;
  val[3] = sizeof (ut) > 4 ? (ut >> 48) & 0xffff : 0;

  /* Add offset.  */
  tmp[0] = VMS_TIME_OFFSET & 0xffff;
  tmp[1] = VMS_TIME_OFFSET >> 16;
  tmp[2] = 0;
  tmp[3] = 0;
  carry = 0;
  for (i = 0; i < 4; i++)
    {
      carry += tmp[i] + val[i];
      val[i] = carry & 0xffff;
      carry = carry >> 16;
    }

  /* Multiply by factor, well first by 10000 and then by 1000.  */
  carry = 0;
  for (i = 0; i < 4; i++)
    {
      carry += val[i] * 10000;
      val[i] = carry & 0xffff;
      carry = carry >> 16;
    }
  carry = 0;
  for (i = 0; i < 4; i++)
    {
      carry += val[i] * 1000;
      val[i] = carry & 0xffff;
      carry = carry >> 16;
    }

  /* Write the result.  */
  *lo = val[0] | (val[1] << 16);
  *hi = val[2] | (val[3] << 16);
}

/* Convert a raw (stored in a buffer) VMS time to a unix time.  */

time_t
vms_rawtime_to_time_t (unsigned char *buf)
{
  unsigned int hi = bfd_getl32 (buf + 4);
  unsigned int lo = bfd_getl32 (buf + 0);

  return vms_time_to_time_t (hi, lo);
}

void
vms_get_time (unsigned int *hi, unsigned int *lo)
{
#ifdef VMS
  struct _generic_64 t;

  sys$gettim (&t);
  *lo = t.gen64$q_quadword;
  *hi = t.gen64$q_quadword >> 32;
#else
  time_t t;

  time (&t);
  vms_time_t_to_vms_time (t, hi, lo);
#endif
}

/* Get the current time into a raw buffer BUF.  */

void
vms_raw_get_time (unsigned char *buf)
{
  unsigned int hi, lo;

  vms_get_time (&hi, &lo);
  bfd_putl32 (lo, buf + 0);
  bfd_putl32 (hi, buf + 4);
}