/*

 * Copyright 1987, 1988 by MIT Student Information Processing Board.

 *

 * Permission to use, copy, modify, and distribute this software and

 * its documentation for any purpose is hereby granted, provided that

 * the names of M.I.T. and the M.I.T. S.I.P.B. not be used in

 * advertising or publicity pertaining to distribution of the software

 * without specific, written prior permission.  M.I.T. and the

 * M.I.T. S.I.P.B. make no representations about the suitability of

 * this software for any purpose.  It is provided "as is" without

 * express or implied warranty.

 */

#include "config.h"

#include <stdio.h>

#ifdef HAVE_TERMIOS_H

#include <termios.h>

#endif

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

#include "com_err.h"

#include "error_table.h"

#include "internal.h"

static void

default_com_err_proc (const char *whoami, errcode_t code, const

          char *fmt, va_list args)

  COM_ERR_ATTR((format(printf, 3, 0)));

static void

default_com_err_proc (const char *whoami, errcode_t code, const

          char *fmt, va_list args)

{

    int do_cr = 1, fd = fileno(stderr);

    if (whoami) {

  fputs(whoami, stderr);

  fputs(": ", stderr);

    }

    if (code) {

  fputs(error_message(code), stderr);

  fputs(" ", stderr);

    }

    if (fmt) {

        vfprintf (stderr, fmt, args);

    }

    if (!isatty(fd))

  do_cr = 0;

#ifdef HAVE_TERMIOS_H

    else {

  struct termios t;

  if ((tcgetattr(fd, &t)) == 0 &&

      (t.c_oflag & OPOST) && (t.c_oflag & ONLCR))

  do_cr = 0;

    }

#endif

    if (do_cr)

  fputc('\r', stderr);

    fputc('\n', stderr);

    fflush(stderr);

}

typedef void (*errf) (const char *, errcode_t, const char *, va_list)

        COM_ERR_ATTR((format(printf, 3, 0)));

errf com_err_hook = default_com_err_proc;

void com_err_va (const char *whoami, errcode_t code, const char *fmt,

     va_list args)

{

    (*com_err_hook) (whoami, code, fmt, args);

}

void com_err (const char *whoami,

        errcode_t code,

        const char *fmt, ...)

{

    va_list pvar;

    if (!com_err_hook)

  com_err_hook = default_com_err_proc;

    va_start(pvar, fmt);

    com_err_va (whoami, code, fmt, pvar);

    va_end(pvar);

}

errf set_com_err_hook(errf new_proc)

{

    errf x = com_err_hook;

    if (new_proc)

  com_err_hook = new_proc;

    else

  com_err_hook = default_com_err_proc;

    return x;

}

errf reset_com_err_hook(void) {

    errf x = com_err_hook;

    com_err_hook = default_com_err_proc;

    return x;

}