/*
 *
 * Gestionnaire d'exceptions
 *
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#define _(x) x
#endif
#include "exceptions.h"

char *contexts[128];
int clevel = 0;

char *Estrdup(char *o)
{
	char *r;

	if (o) {
		if (!(r = strdup(o))) {
			exception(1, _("Out of memory."));
		}
	} else {
		return NULL;
	}
	return r;
}

void *Emalloc(size_t s)
{
	void *r;

	if (s) {
		if (!(r = malloc(s))) {
			exception(1, _("Out of memory."));
		}
	} else {
		return NULL;
	}
	return r;
}

void pushcontext(char *c)
{
	if (clevel == 128) {
		exception(1, _("Too much error contexts during pushcontext()."));
	}
	contexts[clevel++] = Estrdup(c);
#ifdef DEBUG
	fprintf(stderr, "%s\n", c);
#endif
}

void popcontext(void)
{
	if (clevel == 0) {
		exception(1, _("Error context empty, but popcontext() called."));
	}
	free(contexts[--clevel]);
}

void flushcontext(void)
{
	while (clevel) {
		popcontext();
	}
}

void exception(int level, char *msg)
{
	int i;

	fprintf(stderr, "Error detected. Showing context.\n");
	for (i = 0; i < clevel; i++) {
		fprintf(stderr, " (%i) - %s\n", i, contexts[i]);
	}
	fprintf(stderr, "  Error description: %s\n", msg);
	exit(level);
}