fwch.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/fio/fwch.c     92.2    06/22/99 11:11:33"

#include <errno.h>
#include <liberrno.h>
#include <stdlib.h>
#include "fio.h"
#ifdef  _ABSOFT
#include "ac_sysdep.h"
#else           /* NOT _ABSOFT */

#if     defined(_LITTLE_ENDIAN) && !defined(__sv2)
#ifndef FILE_CNT
#define FILE_CNT(__f)   (__f)->_IO_write_end - (__f)->_IO_write_ptr
#endif

#ifndef FILE_PTR
#define FILE_PTR(__f)   (__f)->_IO_write_ptr
#endif

#ifndef FILE_FLAG
#define FILE_FLAG(__f)  (__f)->_flags
#endif

#ifndef IOWRT
#define IOWRT = _IO_CURRENTLY_PUTTING
#endif
#ifndef IOREAD
#define IOREAD = _IO_CURRENTLY_APPENDING
#endif
#ifndef IORW
#define IORW = _IO_TIED_PUTGET
#endif

#else           /* LITTLE_ENDIAN and not sv2 */
#ifndef FILE_CNT
#define FILE_CNT(__f)   (__f)->_cnt
#endif

#ifndef FILE_PTR
#define FILE_PTR(__f)   (__f)->_ptr
#endif

#ifndef FILE_FLAG
#define FILE_FLAG(__f)  (__f)->_flag
#endif

#endif          /* LITTLE_ENDIAN and not sv2 */

#endif          /* _ABSOFT */

#ifdef  _SOLARIS
#undef putc
#endif

/*
 *      _fwch
 *
 *              Pack and then write an array of unpacked characters to the 
 *              current record of a file.
 *
 *      Arguments
 *              cup     - unit pointer
 *              uda     - array of characters, one character per word
 *              chars   - number of characters in uda to write
 *              mode    - PARTIAL or FULL record mode
 *
 *      Return value
 *              chars on successful completion, and -1 on error, with errno set 
 *              to the error code.
 *
 *      Side effects
 *              Clears cup->uend if the file supports multiple endfile
 *              records.
 */

long
_fwch(
        unit    *cup,
        long    *uda,
        long    chars,
        int     mode)
{
        register int    bytsiz;
        register long   nchr;
        unsigned char   tbuf[TBUFSZB];  /* Line packing buffer */
        FILE            *fptr;

/*
 *      If positioned after an endfile, and the file does not
 *      support multiple endfiles, a write is invalid.
 */
        if (cup->uend && !cup->umultfil && !cup->uspcproc) {
                errno   = FEWRAFEN;
                return(IOERR);
        }

        nchr    = 0;

        switch (cup->ufs) {

        case FS_TEXT:
        case STD:
                fptr    = cup->ufp.std;

                /* switch the FILE structure into write mode */

#if     !defined(_LITTLE_ENDIAN) || (defined(_LITTLE_ENDIAN) && defined(__sv2))
                if ((FILE_FLAG(fptr) & (_IOWRT | _IORW)) == _IORW) {
                        if (FILE_FLAG(fptr) & _IOREAD)
                                (void) fseek(fptr, 0, SEEK_CUR);

                        FILE_FLAG(fptr) |= _IOWRT;
                }
#endif

#if     defined(_SOLARIS) || (defined(_LITTLE_ENDIAN) && !defined(__sv2))
                while (nchr < chars) {
                        register long   count;
                        register int    ret;
                        /* Pack chars into temp buffer and write them */
                        count   = chars - nchr;
                        if (count > TBUFSZB)
                                count   = TBUFSZB;
                        _pack(&uda[nchr], (char *)tbuf, count, -1);
                        ret     = fwrite(tbuf, 1, count, fptr);
                        if ( ret != count || ferror(fptr) ) {
                                if ( ret != count || errno == 0)
                                        errno   = FESTIOER;
                                return(IOERR);
                        }
                        nchr    += count;
                }
#else

                /* If the stream is unbuffered... */

                if (FILE_FLAG(fptr) & (_IONBF | _IOLBF)) {
                        while (nchr < chars) {
                                register long   count;
                                register long   ret;

                                /* Pack chars into temp buffer and write them */

                                count   = chars - nchr;

                                if (count > TBUFSZB)
                                        count   = TBUFSZB;

                                _pack(&uda[nchr], (char *)tbuf, count, -1);

                                ret     = fwrite(tbuf, 1, count, fptr);

                                if ( ret != count || ferror(fptr) ) {
                                        if ( ret != count || errno == 0)
                                                errno   = FESTIOER;
                                        return(IOERR);
                                }

                                nchr    += count;
                        }
                }
                else {  /* for a buffered stream... */

                        while (FILE_CNT(fptr) < chars - nchr) {
                                register long   count;
                                register int    ret;

                                count   = FILE_CNT(fptr); /* space left in buffer */
                                if (count > 0) {
                                        /* pack data into the buffer */
                                        _pack(&uda[nchr], (char *)FILE_PTR(fptr),
                                                count, -1);
                                        FILE_PTR(fptr)  += count;
                                        FILE_CNT(fptr)  = 0;
                                }

                                /*
                                 * We set errno to 0 here in case the following
                                 * buffer flush fails.  UNICOS 8.2 fputc (and
                                 * previous) was not X/Open compliant and did
                                 * not always set errno when a buffer flush
                                 * completed partially due to a disk full
                                 * conditon.  The zeroing of errno may be
                                 * removed when we can assume that the fputc()
                                 * from UNICOS and Solaris are X/Open compliant.
                                 */

                                errno   = 0;

                                /*
                                 * This fputc() will either trigger a buffer
                                 * flush or cause the buffer to be allocated
                                 * for the first time.
                                 */

                                ret     = fputc(uda[nchr + count], fptr);

                                if (ret == EOF && ferror(fptr)) {
                                        if (errno == 0)
                                                errno   = FESTIOER;
                                        return(IOERR);
                                }

                                nchr    += count + 1;
                        }

                        if (nchr < chars) {     /* Put data in buffer */
                                _pack(&uda[nchr], (char *)FILE_PTR(fptr),
                                        chars - nchr, -1);

                                FILE_CNT(fptr)  -= chars - nchr;
                                FILE_PTR(fptr)  += chars - nchr;
                        }
                }
#endif

                if (mode == FULL) {
                        register int    ret;

                        ret     = putc('\n', fptr);;

                        if (ret == EOF && ferror(fptr)) {
                                if (errno == 0)
                                        errno   = FESTIOER;
                                return(IOERR);
                        }
                        chars++;
                }

                return(chars);

        case FS_FDC:

                /*
                 * If a logical endfile record had just been read,
                 * replace it with a physical endfile record before
                 * starting the current data record.
                 */
                if ((cup->uend == LOGICAL_ENDFILE) && !(cup->uspcproc)) {
                        if (XRCALL(cup->ufp.fdc, weofrtn)cup->ufp.fdc,
                                &cup->uffsw) < 0){
                                errno   = cup->uffsw.sw_error;
                                return(IOERR);
                        }
                }

                cup->uend       = BEFORE_ENDFILE;

                if (cup->ucharset == 0) {
                        register long   ret;

                        ret     = XRCALL(cup->ufp.fdc, writecrtn) cup->ufp.fdc,
                                        WPTR2BP(uda),
                                        chars, &cup->uffsw, mode);

                        if (ret < 0) {
                                errno   = cup->uffsw.sw_error;
                                return(IOERR);
                        }

                        return(chars);
                }

/*
 *              Get proper byte size (might not be 8-bits if doing conversion).
 */

#if     NUMERIC_DATA_CONVERSION_ENABLED
                bytsiz  = __fndc_charsz[cup->ucharset];
#else
                bytsiz  = 8;
#endif

                do {
                        register long   breq;
                        register int    fulp;
                        register long   ncnt;
                        register long   ret;
                        int             ubc;

                        ncnt    = TBUFSZB;
                        breq    = 0;
                        ubc     = 0;

                        if ((chars - nchr) > 0) {
                                register long   totbits;

                                if (ncnt > (chars - nchr))
                                        ncnt    = chars - nchr;

                                if (_fdc_packc(tbuf, &uda[nchr], ncnt,
                                        cup->ucharset) < 0) {
                                        return(IOERR);
                                }


                                totbits = bytsiz * ncnt;        /* bit count */
                                breq    = (totbits + 7) >> 3; /* 8-bit bytes */
                                ubc     = (breq << 3) - totbits;
                        }

                        nchr    += ncnt;

                        if ((nchr >= chars) && ( mode == FULL ))
                                fulp    = FULL;
                        else
                                fulp    = PARTIAL;

                        ret     = XRCALL(cup->ufp.fdc, writertn) cup->ufp.fdc,
                                        CPTR2BP(tbuf),
                                        breq, &cup->uffsw, fulp, &ubc);

                        if (ret != breq) {      /* if an error */
                                errno   = cup->uffsw.sw_error;
                                return(IOERR);
                        }

                } while (nchr < chars);

                return(chars);
/*
 *      unsupported structure if not TEXT/STD, or FDC
 */
        default:
                errno   = FEINTFST;
                return(IOERR);
        }
}