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error.c

/*    $NetBSD: error.c,v 1.30 2003/01/22 20:36:03 dsl Exp $ */

/*-
 * Copyright (c) 1991, 1993
 *    The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Kenneth Almquist.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)error.c 8.2 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: error.c,v 1.30 2003/01/22 20:36:03 dsl Exp $");
#endif
#endif /* not lint */

/*
 * Errors and exceptions.
 */

#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>

#include "shell.h"
#include "main.h"
#include "options.h"
#include "output.h"
#include "error.h"
#include "show.h"
#include "eval.h"
#include "parser.h"
#include "trap.h"
#include "system.h"


/*
 * Code to handle exceptions in C.
 */

struct jmploc *handler;
int exception;
int suppressint;
volatile sig_atomic_t intpending;


static void exverror(int, const char *, va_list)
    __attribute__((__noreturn__));

/*
 * Called to raise an exception.  Since C doesn't include exceptions, we
 * just do a longjmp to the exception handler.  The type of exception is
 * stored in the global variable "exception".
 */

void
exraise(int e)
{
#ifdef DEBUG
      if (handler == NULL)
            abort();
#endif
      INTOFF;

      exception = e;
      longjmp(handler->loc, 1);
}


/*
 * Called from trap.c when a SIGINT is received.  (If the user specifies
 * that SIGINT is to be trapped or ignored using the trap builtin, then
 * this routine is not called.)  Suppressint is nonzero when interrupts
 * are held using the INTOFF macro.  (The test for iflag is just
 * defensive programming.)
 */

void
onint(void) {
      int i;

      intpending = 0;
      sigclearmask();
      i = EXSIG;
      if (gotsig[SIGINT - 1] && !trap[SIGINT]) {
            if (!(rootshell && iflag)) {
                  signal(SIGINT, SIG_DFL);
                  raise(SIGINT);
            }
            i = EXINT;
      }
      exraise(i);
      /* NOTREACHED */
}

static void
exvwarning2(const char *msg, va_list ap)
{
      struct output *errs;
      const char *name;
      const char *fmt;

      errs = out2;
      name = arg0;
      fmt = "%s: ";
      if (commandname) {
            name = commandname;
            fmt = "%s: %d: ";
      }
      outfmt(errs, fmt, name, startlinno);
      doformat(errs, msg, ap);
#if FLUSHERR
      outc('\n', errs);
#else
      outcslow('\n', errs);
#endif
}

#define exvwarning(a, b, c) exvwarning2(b, c)

/*
 * Exverror is called to raise the error exception.  If the second argument
 * is not NULL then error prints an error message using printf style
 * formatting.  It then raises the error exception.
 */
static void
exverror(int cond, const char *msg, va_list ap)
{
#ifdef DEBUG
      if (msg) {
            TRACE(("exverror(%d, \"", cond));
            TRACEV((msg, ap));
            TRACE(("\") pid=%d\n", getpid()));
      } else
            TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid()));
      if (msg)
#endif
            exvwarning(-1, msg, ap);

      flushall();
      exraise(cond);
      /* NOTREACHED */
}


void
error(const char *msg, ...)
{
      va_list ap;

      va_start(ap, msg);
      exverror(EXERROR, msg, ap);
      /* NOTREACHED */
      va_end(ap);
}


void
exerror(int cond, const char *msg, ...)
{
      va_list ap;

      va_start(ap, msg);
      exverror(cond, msg, ap);
      /* NOTREACHED */
      va_end(ap);
}

/*
 * error/warning routines for external builtins
 */

void
sh_warnx(const char *fmt, ...)
{
      va_list ap;

      va_start(ap, fmt);
      exvwarning(-1, fmt, ap);
      va_end(ap);
}


/*
 * Return a string describing an error.  The returned string may be a
 * pointer to a static buffer that will be overwritten on the next call.
 * Action describes the operation that got the error.
 */

const char *
errmsg(int e, int action)
{
      if (e != ENOENT && e != ENOTDIR)
            return strerror(e);

      if (action & E_OPEN)
            return "No such file";
      else if (action & E_CREAT)
            return "Directory nonexistent";
      else
            return "not found";
}


#ifdef REALLY_SMALL
void
__inton() {
      if (--suppressint == 0 && intpending) {
            onint();
      }
}
#endif

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