/*
 *  Baltisot
 *  Copyright (C) 1999-2003 Nicolas "Pixel" Noble
 *
 *  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
 */

/* $Id: Exceptions.cc,v 1.34 2004-11-27 21:35:19 pixel Exp $ */

#include <string.h>
#include <errno.h>
#include <stddef.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#else
#ifndef __APPLE__
#include <malloc.h>
#endif
#endif
#ifdef DEBUG
#include <iostream>
#endif
#ifdef HAVE_PIPE
#include <unistd.h>
#endif
#include "BString.h"
#include "Exceptions.h"
#include "generic.h"
#include "gettext.h"

char GeneralException::t[BUFSIZ];

std::vector<String> Base::context;

GeneralException::GeneralException(String emsg) : msg(emsg.strdup()) {
    UNLOCK;
#ifdef DEBUG
    printm(M_BARE, String(_("Generating a General Exception error: '")) + msg + "'.\n");
#endif
}
GeneralException::GeneralException() : msg(0) {
    UNLOCK;
#ifdef DEBUG
    printm(M_BARE, String(_("Generating a General Exception error: '")) + msg + "'.\n");
#endif
}
GeneralException::GeneralException(const GeneralException & e) : msg(strdup(e.msg)) {
    UNLOCK;
#ifdef DEBUG
    printm(M_BARE, String(_("Generating a General Exception error: '")) + msg + "'.\n");
#endif
}

GeneralException::~GeneralException() {
    free(msg);
}

TaskNotFound::TaskNotFound() : GeneralException(_("Task not found")) { }

const char * GeneralException::GetMsg() const {
    return msg;
}

MemoryException::MemoryException(ssize_t s) {
    sprintf(t, _("Failed allocating %u bytes."), s);
    msg = strdup(t);
}

IOException::IOException(String fn, op_t op, ssize_t s) {
    sprintf(t, _("An error has occured while %s %u bytes on %s: %s"), op == IO_WRITE ? _("writing") : _("reading"),
	    s, fn.to_charp(), strerror(errno));
    msg = strdup(t);
}

IOGeneral::IOGeneral(String fn) : GeneralException(fn) { }

IOGeneral::IOGeneral() { }

IOAgain::IOAgain() : IOGeneral(_("No more bytes for reading or writing.")) {
#ifdef DEBUG
    printm(M_BARE, String(_("Generating an IOAgain exception: '")) + GetMsg() + "'.\n");
#endif
}

TaskSwitch::TaskSwitch() : GeneralException(_("Switching task in a non-tasked environnement")) {
#ifdef DEBUG
    printm(M_BARE, String(_("Generating a TaskSwitch exception: '")) + GetMsg() + "'.\n");
#endif
}

Exit::Exit(int a_code) : GeneralException(_("Exitting with code " + a_code)), code(a_code) {
#ifdef DEBUG
    printm(M_BARE, String(_("Generating an Exit exception: '")) + GetMsg() + "'.\n");
#endif
}

int Exit::GetCode() {
    return code;
}

char * xstrdup(const char * s) {
    char * r;
    
    r = (char *) xmalloc(strlen(s) + 1);
    strcpy(r, s);
    return r;
}

void * xmalloc(size_t s) throw (GeneralException) {
    char * r;
    
    if (s == 0) {
	return 0;
    }
    
    if (!(r = (char *) ::malloc(s))) {
	throw MemoryException(s);
    }
#ifdef DEBUG
//    Base::printm(M_BARE, String(_("Allocating %i bytes of memory, got it at %p\n")), s, r);
#endif
    
    memset(r, 0, s);
    
    return (void *)(r);
}

void * xrealloc(void * ptr, size_t s) {
#ifdef DEBUG
    void * r = realloc(ptr, s);
    Base::printm(M_BARE, String(_("Reallocating pointer at %p for %i bytes, now at %p\n")), ptr, s, r);
    return r;
#else
    return realloc(ptr, s);
#endif
}

void xfree(unsigned char *& p) {
#ifdef DEBUG
//    Base::printm(M_BARE, String(_("Freeing pointer at %p\n")), p);
#endif
    if (p) {
	::free(p);
	p = 0;
    }
}

#ifdef HAVE_PIPE
int xpipe(int * p, int flag) throw (GeneralException) {
    if (pipe(p)) {
	throw GeneralException(String(_("Error creating pipe: ")) + strerror(errno));
    }
			            
    return p[flag];
}
#else
int xpipe(int *, int) throw (GeneralException) {
    throw GeneralException(_("Function pipe() not supported by this system.\n"));
}
#endif

#ifdef HAVE_FORK
pid_t xfork() throw (GeneralException) {
    pid_t p;
    
    p = fork();
    
    if (p == -1) {
	throw GeneralException(_("Was not able to fork().\n"));
    }
    
    return p;
}
#else
pid_t xfork() throw (GeneralException) {
    throw GeneralException(_("Function fork() not supported by this system.\n"));
}
#endif

void xexit(int status) throw (GeneralException) {
    throw Exit(status);
}

void xexception(const String & err) throw (GeneralException) {
    throw GeneralException(err);
}

char * Base::strdup(const char * s) {
    return xstrdup(s);
}

void * Base::malloc(ssize_t s) {
    return xmalloc(s);
}

void * Base::realloc(void * p, size_t s) {
    return xrealloc(p, s);
}

void * Base::calloc(size_t n, size_t s) {
    return xmalloc(n * s);
}

void * Base::operator new(size_t s) {
#ifdef DEBUG
    printm(M_BARE, _("Operator new(s) called. Allocating memory.\n"));
#endif
    return xmalloc(s);
}

void * Base::operator new(size_t s, void * p) {
#ifdef DEBUG
    printm(M_BARE, String(_("Operator new(s, p) called with p = %p and s = %i. Erasing memory.\n")), p, s);
#endif
    return memset(p, 0, s);
}

void Base::operator delete(void * p) {
#ifdef DEBUG
    printm(M_BARE, _("Operator delete(p) called. Freeing memory.\n"));
#endif
    free(p);
}

int Base::pipe(int * p, int flag) {
    return xpipe(p, flag);
}

pid_t Base::fork() {
    return xfork();
}

void Base::exit(int status) {
    xexit(status);
}

void Base::flushcontext() {
    context.clear();
}

void Base::pushcontext(const String & c) {
    context.push_back(c);
}

void Base::popcontext() {
    context.pop_back();
}

void Base::exception(const String & err) {
    int c;
    std::vector<String>::iterator i;
    printm(M_ERROR, "Error detected, showing context.\n");
    for (i = context.begin(), c = 0; i != context.end(); i++, c++) {
	printm(M_ERROR, " (%i) - " + *i + "\n", c);
    }
    
    printm(M_ERROR, "  Error description: " + err);

    xexception(err);
}