csc360-a1-shell/utils.c

/*
 * A simple shell with some basic features.
 *
 * Sami Samhuri 0327342
 * January 31, 2006
 * CSC 360, Assignment 1
 *
 * utils.c
 * $Id: utils.c 184 2006-01-29 08:53:30Z sjs $
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "utils.h"

char *array_cat ( char **array )
{
	char *p = NULL, *str = NULL;
	int i, pos = 0;
	for (i = 0; array[i]; i++)
	{
		if (DEBUG)
			printf("DEBUG: array[%i]=%p:'%s'\n", i, array[i], array[i]);
		int len = strlen (array[i]);
		str = (char *)myxrealloc (str, pos + len + 1);
		p = str + pos;
		memcpy (p, array[i], len);
        p += len;
		*p++ = ' ';
		pos += len + 1;
	}
	*--p = '\0';
	if (DEBUG)
		printf("DEBUG: str=%p\n", str);
	return str;
}

void free_array ( void **array )
{
	int i = 0;

	if (!array)
		return;

	while ( array[i] )
		free (array[i++]);
	free (array);
}

void *myxmalloc ( size_t size )
{
	void *ptr = malloc (size);
	if (ptr)
		return ptr;

	printf(RED "Out of memory, bailing!\n" CLEAR);
	exit (EXIT_FAILURE);
}

void *myxrealloc( void *ptr, size_t size )
{
	void *new_ptr = realloc (ptr, size);
	if (new_ptr)
		return new_ptr;

	printf(RED "Out of memory, bailing!\n" CLEAR);
	exit (EXIT_FAILURE);
}

void **array_realloc ( void **array, size_t size )
{
	void **ptr = realloc (array, size * sizeof (void *));
	if (ptr)
		return ptr;

	free_array (array);
	printf (RED "Out of memory, bailing!\n" CLEAR);
	exit (EXIT_FAILURE);
}