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/* This is file CRLF2NL.C */

/*

** Copyright (C) 1991 DJ Delorie, 24 Kirsten Ave, Rochester NH 03867-2954

**

** This file is distributed under the terms listed in the document

** "copying.dj", available from DJ Delorie at the address above.

** A copy of "copying.dj" should accompany this file; if not, a copy

** should be available from where this file was obtained.  This file

** may not be distributed without a verbatim copy of "copying.dj".

**

** This file is distributed WITHOUT ANY WARRANTY; without even the implied

** warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

*/

unsigned crlf2nl(char *buf, unsigned len)

{

  char *bp = buf;

  int i=0;

  while (len--)

  {

    if (*bp != 13)

    {

      *buf++ = *bp;

      i++;

    }

    bp++;

  }

  return i;

}

unsigned readcr(int fd, char *buf, unsigned len)

{

  unsigned i;

  i = read(fd, buf, len);

  if (i <= 0)

    return i;

  return crlf2nl(buf, i);

}

static char *sbuf = 0;

#define BUFSIZE 4096

unsigned writecr(int fd, char *buf, unsigned len)

{

  unsigned bufp=0, sbufp=0, crcnt=0, rlen=0;

  int rv;

  if (sbuf == 0)

    sbuf = (char *)malloc(BUFSIZE+1);

  while (len--)

  {

    if (buf[bufp] == 10)

    {

      crcnt++;

      sbuf[sbufp++] = 13;

    }

    sbuf[sbufp++] = buf[bufp++];

    if ((sbufp >= BUFSIZE) || (len == 0))

    {

      rv = write(fd, sbuf, sbufp);

      if (rv < 0)

        return rv;

      rlen += rv - crcnt;

      crcnt = 0;

      sbufp = 0;

    }

  }

  return rlen;

}