trim.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 "@(#) libfi/char/trim.c   92.2    07/30/99 10:09:59"

/*
 *      TRIM - Return the character argument with trailing blank characters
 *              removed
 */

#include <fortran.h>
#include <liberrno.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <cray/dopevec.h>

extern long     _zero_entity;   /* nonzero addr for PRESENT func */

void
_TRIM(
        DopeVectorType  *result,
        _fcd            source)
{
        int             src_len;
        int             leng;
        char            *sptr;
        char            *rptr;
        int             i;

/*      Convert Fortran Character Descriptors to C pointers     */

        src_len = _fcdlen (source);
        sptr    = _fcdtocp (source);

/*      Determine length of string to return                    */

        leng    = 0;
        for (i = src_len - 1; i >= 0; i--) {
            if (sptr[i] != ' ') {
                leng    = i+1;
                break;
            }
        }

/*      Allocate result space, if necessary     */

        if (!result->assoc) {

/*      Set the base address of the result dope vector to special
 *      address when source string is null or all blanks so the
 *      compiler can do a check of nonzero to distinguish between
 *      an argument that is not present and one that is zero-sized.
 */

            if (leng > 0) {
                result->base_addr.a.ptr = (void *) malloc(leng);
                if (result->base_addr.a.ptr == NULL)
                    _lerror(_LELVL_ABORT, FENOMEMY);
                rptr = (char *) result->base_addr.a.ptr;
            } else 
                rptr    = (void *) &_zero_entity;

            /* set assoc flag even for zero-sized allocation */
            result->assoc       = 1;
            result->orig_base   = result->base_addr.a.ptr;
            result->base_addr.charptr   = _cptofcd (rptr, leng);
            result->orig_size   = leng << 3;
#if !defined(_ADDR64) && !defined(_WORD32) && !defined(__mips) && !defined(_LITTLE_ENDIAN)
            result->base_addr.a.el_len  = leng << 3;
#endif
        } else
            _lerror(_LELVL_ABORT, FEINTUNK);

/*      If source string is all null, all blanks, or no trailing blanks,
 *      return string without any assignment.  Otherwise, return the
 *      entire string without trailing blanks.
 */
        if (leng > 0)
            (void) memcpy (rptr, sptr, leng);

        return;
}