/* full-write.c -- an interface to write that retries after interrupts
   Copyright (C) 1993, 1994 Free Software Foundation, Inc.

   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 2, 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., 675 Mass Ave, Cambridge, MA 02139, USA.

   Copied largely from GNU C's cccp.c.
   */


#include "../src/conf.h"
#include "../src/cf.defs.h"
#include <sys/types.h>

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <errno.h>
#ifndef STDC_HEADERS
extern int errno;
#endif

/* Write LEN bytes at PTR to descriptor DESC, retrying if interrupted.
   Return LEN upon success, write's (negative) error code otherwise.  */

int cf_full_write (desc,ptr,len)

int desc;
char *ptr;
size_t len;

{ int total_written;

total_written = 0;

while (len > 0)
   {
   int written = write (desc,ptr,len);
   
   if (written < 0)
      {
      if (errno == EINTR)
         {
         continue;
         }
      return written;
      }
   total_written += written;
   ptr += written;
   len -= written;
   }

return total_written;
}