osprey/libf/pxf/pxfsetenv.c

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/*

  Copyright (C) 2000, 2001 Silicon Graphics, Inc.  All Rights Reserved.

  This program is free software; you can redistribute it and/or modify it
  under the terms of version 2.1 of the GNU Lesser General Public License 
  as published by the Free Software Foundation.

  This program is distributed in the hope that it would be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  

  Further, this software is distributed without any warranty that it is
  free of the rightful claim of any third person regarding infringement 
  or the like.  Any license provided herein, whether implied or 
  otherwise, applies only to this software file.  Patent licenses, if
  any, provided herein do not apply to combinations of this program with 
  other software, or any other product whatsoever.  

  You should have received a copy of the GNU Lesser General Public 
  License along with this program; if not, write the Free Software 
  Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307, 
  USA.

  Contact information:  Silicon Graphics, Inc., 1600 Amphitheatre Pky,
  Mountain View, CA 94043, or:

  http://www.sgi.com

  For further information regarding this notice, see:

  http://oss.sgi.com/projects/GenInfo/NoticeExplan

*/


#pragma ident "@(#) libf/pxf/pxfsetenv.c  92.1  06/29/99 11:36:06"



#include <malloc.h>
#include <fortran.h>
#include <errno.h>
#include <liberrno.h>
#include <stdlib.h>
#include <string.h>

#ifndef _UNICOS
#include <stddef.h>
#endif

extern char *_fc_acopy(_fcd f);

/*
 *  PXFSETENV  -- set environment variable pair
 *  (section 4.6.1 of POSIX 1003.9-1992)
 *
 *  Call from Fortran:
 *
 *  SUBROUTINE PXFSETENV(NAME, LENNAME, NEW, LENNEW, IOVERWRITE, IERROR)
 *  CHARACTER*(*) NAME, NEW
 *  INTEGER LENNAME, LENNEW, IOVERWRITE, IERROR
 *
 *  Where:
 *
 *  NAME        is an input character variable or array element
 *          containing the environment name value to be set.
 *
 *  LENNAME     is an input integer variable containing the
 *              character length of NAME. If LENNAME is zero,
 *              trailing blanks are removed.
 *
 *  NEW         is an input character variable or array element
 *              containing the new environment value for the
 *              name=value environment pair.
 *
 *  LENNEW      is an input integer variable containing the
 *              character length of NEW. If LENNEW is zero,
 *              trailing blanks are removed.
 *
 *  IOVERWRITE  is an input integer variable containing a zero
 *              or nonzero number. When the value is zero,
 *              a name=value pair with the name value matching
 *              NAME will not be replaced with a new NAME=NEW
 *              pair. A nonzero IOVERWRITE value will replace
 *              the matching name=value pair with NAME=NEW pair.
 *
 *  IERROR      is an output integer varible that will contain
 *              the status:
 *
 *               zero    - environment varible was changed.
 *
 *               nonzero - PXFSETENV was not successful.
 *
 *              PXFSETENV may return any of the following error
 *              values:
 *
 *               EINVAL If LENNAME < 0 or LENNAME > LEN(NAME) or
 *      LENNEW < 0 or LENNEW > LEN(NEW)
 *
 *               ENOMEM If PSFSETENV is unable to obtain memory
 *      to copy NAME and NEW to a new name=value
 *      string.
 *
 *
 */

#ifdef _UNICOS
void
PXFSETENV(
#else
void
_PXFSETENV(
#endif
  _fcd  NAME,
  _f_int  *LENNAME,
  _fcd  NEW,
  _f_int  *LENNEW,
  _f_int  *IOTHERWISE,
  _f_int  *IERROR)
{
  int ilenname, slenname, ilennew, slennew;
  char *buf, *cname, *cnew;

  ilenname = *LENNAME;
  slenname = _fcdlen(NAME);
  ilennew = *LENNEW;
  slennew = _fcdlen(NEW);
  *IERROR = 0;

  /* check if the length of the lenname input argument is valid. */
  if (ilenname < 0 || ilenname > slenname ||
      ilennew < 0 || ilennew > slennew)
    *IERROR = EINVAL;
  else {
    if (ilenname == 0) {
      /*
        * If length is zero, user wants trailing blanks stripped.
        * Otherwise, malloc memory and copy the string adding a
        * NULL terminator.
        */

      cname = _fc_acopy(NAME);
      ilenname = slenname;
    } else {

      cname = (char *) malloc (ilenname + 1);
      if (cname != NULL) {
  memcpy(cname, _fcdtocp(NAME), ilenname);
  cname[ilenname] ='\0';
      } else {
  *IERROR = ENOMEM;
  return;
      }

    }

    /* check if NAME already exists in the envrion variable when
       IOTHERWISE is zero. */
    if (*IOTHERWISE == 0 && getenv(cname) != NULL)
      return;

    if (ilennew == 0) {

      /*
        * If length is zero, user wants trailing blanks stripped.
        * Otherwise, malloc memory and copy the string adding a
        * NULL terminator.
        */

      cnew = _fc_acopy(NEW);
      ilennew = slennew;
    } else {
     
      cnew = (char *) malloc(ilennew + 1);
      if (cnew != NULL) {
  memcpy(cnew, _fcdtocp(NEW), ilennew);
  cnew[ilennew] ='\0';
      } else {
  *IERROR = ENOMEM;
  return;
      }

    }

    if (cname == NULL || cnew == NULL)
      *IERROR = ENOMEM;
    else {

      /* concatenate strings to make cname=cnew pair */
      if ((buf = (char *) malloc(ilenname + ilennew + 2)) == NULL) {
  *IERROR = ENOMEM;
  return;
      } else {
  
  /* create 'cname=cnew' pair */
  strcpy(buf, cname);
  strcat(buf, "=\0");
  strcat(buf, cnew);
  free(cname);
  free(cnew);
      }

      if (putenv(buf) != 0)
  *IERROR = ENOMEM;
    }
  }
  return;
}

#ifndef _UNICOS

void
pxfsetenv_(
  char *NAME,
        _f_int *LENNAME,
        char *VALUE,
        _f_int *LENVAL,
  _f_int *IOTHERWISE,
        _f_int *IERROR,
        _f_int namelen,
        _f_int valuelen)
{
  _PXFSETENV( _cptofcd(NAME, namelen), LENNAME,
        _cptofcd(VALUE, valuelen), LENVAL,
        IOTHERWISE, IERROR);
  return;
}

#endif

---