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MIT/X Consortium License

(C)opyright MMVI Anselm R. Garbe <garbeam at gmail dot com>
(C)opyright MMVI Sander van Dijk <a dot h dot vandijk at gmail dot com>

Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the 
Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in 
all copies or substantial portions of the Software. 

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL 
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
DEALINGS IN THE SOFTWARE.
888 } /* Comment.Single */ .highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */ .highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */ .highlight .ge { font-style: italic } /* Generic.Emph */ .highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */ .highlight .gr { color: #aa0000 } /* Generic.Error */ .highlight .gh { color: #333333 } /* Generic.Heading */ .highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */ .highlight .go { color: #888888 } /* Generic.Output */ .highlight .gp { color: #555555 } /* Generic.Prompt */ .highlight .gs { font-weight: bold } /* Generic.Strong */ .highlight .gu { color: #666666 } /* Generic.Subheading */ .highlight .gt { color: #aa0000 } /* Generic.Traceback */ .highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */ .highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */ .highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */ .highlight .kp { color: #008800 } /* Keyword.Pseudo */ .highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */ .highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */ .highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */ .highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */ .highlight .na { color: #336699 } /* Name.Attribute */ .highlight .nb { color: #003388 } /* Name.Builtin */ .highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */ .highlight .no { color: #003366; font-weight: bold } /* Name.Constant */ .highlight .nd { color: #555555 } /* Name.Decorator */ .highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */ .highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */ .highlight .nl { color: #336699; font-style: italic } /* Name.Label */ .highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */ .highlight .py { color: #336699; font-weight: bold } /* Name.Property */ .highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */ .highlight .nv { color: #336699 } /* Name.Variable */ .highlight .ow { color: #008800 } /* Operator.Word */ .highlight .w { color: #bbbbbb } /* Text.Whitespace */ .highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */ .highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */ .highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */ .highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */ .highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */ .highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */ .highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */ .highlight .sc { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Char */ .highlight .dl { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Delimiter */ .highlight .sd { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Doc */ .highlight .s2 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Double */ .highlight .se { color: #0044dd; background-color: #fff0f0 } /* Literal.String.Escape */ .highlight .sh { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Heredoc */ .highlight .si { color: #3333bb; background-color: #fff0f0 } /* Literal.String.Interpol */ .highlight .sx { color: #22bb22; background-color: #f0fff0 } /* Literal.String.Other */ .highlight .sr { color: #008800; background-color: #fff0ff } /* Literal.String.Regex */ .highlight .s1 { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Single */ .highlight .ss { color: #aa6600; background-color: #fff0f0 } /* Literal.String.Symbol */ .highlight .bp { color: #003388 } /* Name.Builtin.Pseudo */ .highlight .fm { color: #0066bb; font-weight: bold } /* Name.Function.Magic */ .highlight .vc { color: #336699 } /* Name.Variable.Class */ .highlight .vg { color: #dd7700 } /* Name.Variable.Global */ .highlight .vi { color: #3333bb } /* Name.Variable.Instance */ .highlight .vm { color: #336699 } /* Name.Variable.Magic */ .highlight .il { color: #0000DD; font-weight: bold } /* Literal.Number.Integer.Long */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#include <errno.h>

#ifdef DEBUG
#define DEBUG true
#else
#define DEBUG false
#endif

#ifdef TO_UNITS_ON_THE_END
#define TO_UNITS_ON_THE_END true
#else
#define TO_UNITS_ON_THE_END false
#endif

#ifdef FROM_UNITS_ON_THE_END
#define FROM_UNITS_ON_THE_END true
#else
#define FROM_UNITS_ON_THE_END false
#endif

typedef struct NumeralPtr
{
	char const* symbol;
	struct NumeralPtr *next;
	struct NumeralPtr *previous;
} numeral_ptr;

char* program_name = NULL;

/*
 * Creates new digit for numeral_ptr
 * Return pointer to new numeral_ptr
 * Returns NULL in case of no memory
 */
numeral_ptr*
new_digit(numeral_ptr* last_numeral, char const* to_first)
{
	numeral_ptr* starting_point = malloc(sizeof(numeral_ptr));
	if(starting_point == NULL)
	{
		fprintf(stderr, "error: %s: %s!", program_name, strerror(ENOMEM));
		return NULL;
	}

	starting_point->symbol = to_first;
	starting_point->previous = last_numeral;
	starting_point->next = NULL;

	return starting_point;
}

void
increment(numeral_ptr* numeral, char* num_first, char* num_last)
{
	bool cycled = false;

	if( numeral->symbol == num_last )
	{
		if( numeral->next == NULL )
			numeral->next = new_digit(numeral, num_first);
		else
			increment(numeral->next, num_first, num_last);

		cycled = true;
	}

	if( cycled )
		numeral->symbol = num_first;
	else
		++(numeral->symbol);
}

bool
is_the_same(numeral_ptr* numeral, char* number_arg)
{
	while( !(numeral == NULL) )
	{
		if( *(numeral->symbol) == *(number_arg) )
		{
			numeral = numeral->next;
			++(number_arg);
			continue;
		}

		return false;
	}

	return (*number_arg == '\0') ? true : false;
}

void
print_numeral(numeral_ptr* numeral)
{
	if( TO_UNITS_ON_THE_END )
	{
		while( !(numeral->next == NULL) )
			numeral = numeral->next;

		while( !(numeral == NULL) )
		{
			printf("%c", *(numeral->symbol));
			numeral = numeral->previous;
		}
	}
	else
	{
		while( !(numeral == NULL) )
		{
			printf("%c", *(numeral->symbol));
			numeral = numeral->next;
		}
	}

	printf("\n");
}

void
reverse_string(char* string)
{
	char tmp;
	char* string_end = string + strlen(string);

	while ( --string_end > string )
	{
		tmp = *string;
		*string++ = *string_end;
		*string_end = tmp;
	}
}

int
main(int argc, char* argv[])
{
	program_name = argv[0];

	/* argument processing */
	if( !(argc == 2) )
	{
		fprintf(stderr, "usage: %s <number>\n", program_name);
		exit(EXIT_FAILURE);
	}

	/* Numeral System variables from MACROS */
	char* from = malloc( (strlen(FROM_NUMERICALS) + 1) * sizeof(char) );
	char* to = malloc( (strlen(TO_NUMERICALS) + 1) * sizeof(char) );

	strcpy(from, FROM_NUMERICALS);
	strcpy(to, TO_NUMERICALS);

	/* Number variables to be converted */
	char* number = argv[1];

	/* _first and _last variables */
	char* from_first = from;
	char* from_last = from + (strlen(from) - 1);

	char* to_first = to;
	char* to_last = to + (strlen(to) - 1);

	if( FROM_UNITS_ON_THE_END )
	{
		reverse_string(number);
	}

	/* initializing counting and result */
	numeral_ptr* counting = new_digit(NULL, from_first);
	numeral_ptr* result = new_digit(NULL, to_first);

	/* increments until it finishes */
	while( !is_the_same(counting, number) )
	{
		if(DEBUG)
		{
			puts("----");
			print_numeral(result);
		}
		increment(result, to_first, to_last);

		if(DEBUG)
			print_numeral(counting);
		increment(counting, from_first, from_last);
	}
	if(DEBUG)
		puts("----");

	/* print */
	if(DEBUG)
	{
		printf("counting: ");
		print_numeral(counting);
		printf("result: ");
	}

	print_numeral(result);

	return EXIT_SUCCESS;
}