File: module_command.c

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/* cvm/module_command.c - CVM command module main routine
 * Copyright (C) 2010  Bruce Guenter <bruce@untroubled.org>
 *
 * 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 of the License, 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
#include <unistd.h>
#include "module.h"

static int read_input(void)
{
  size_t rd;

  cvm_module_inbuflen = 0;
  for (cvm_module_inbuflen = 0;
       cvm_module_inbuflen <= BUFSIZE;
       cvm_module_inbuflen += rd) {
    if ((rd = read(0, cvm_module_inbuffer+cvm_module_inbuflen,
		   BUFSIZE-cvm_module_inbuflen)) == (unsigned)-1)
      return CVME_IO;
    if (rd == 0) break;
  }
  return 0;
}

static int write_output(void)
{
  size_t wr;
  unsigned char* ptr;
  
  for (ptr = cvm_module_outbuffer;
       cvm_module_outbuflen > 0;
       cvm_module_outbuflen -= wr, ptr += wr) {
    if ((wr = write(1, ptr, cvm_module_outbuflen)) == (unsigned)-1
	|| wr == 0)
      return CVME_IO;
  }
  return 0;
}

extern void usage(void);

int command_main(void)
{
  int code;
  int wcode;
  if ((code = cvm_module_init()) != 0) return code;
  if ((code = read_input()) != 0) { cvm_module_stop(); return code; }
  code = cvm_module_handle_request();
  cvm_module_fact_end(code);
  if ((wcode = write_output()) != 0 && code == 0) code = wcode;
  cvm_module_stop();
  return code & CVME_MASK;
}