Identification numbers and check digit algorithms

/*
 *  checkalgo.h - function definations for CheckAlgo
 *
 *  Copyright (c) 2012  Shine Jayakumar (shine_hack@yahoo.com)
 *
 *  This file is part of CheckAlgo.
 *
 *  CheckAlgo 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  CheckAlgo 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 CheckAlgo.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
 

#ifndef CHECKALGO_H
#define CHECKALGO_H

#define   NULLCHAR      '\0'
#define   VERIFIED       77
#define   NOTVERIFIED     0
#define   INVALID        -1
          


int  char2int(char ch);              //converts character to integer
char int2char(int ch);               //converts integer to character

int  checkArg(char s[], int noOfArg, char *argstr[]);//checks the argument

int  extractNum(char str[], char num[]);             //extracts the number
void extractOption(char str[], char opt[], int pos); //extracts the option

void clearArr(char a[]);              //clears an array
void completeNumber(char a[]);        //fills incomplete number


int  ibm_mod10(char a[]);            //mod10 check
int  ibm_mod10_checksum(char a[]);   //creates checksum
void createNumMod10(char a[], char completenum[]); //generates a valid number


int  uspsmo(char a[]);                //usps money order  


int  upc_a(char a[]);                 //upc check
int  ean(char a[]);                   //ean check




int  isbn_10(char a[]);               //isbn 10 digits
int  isbn_13(char a[]);               //isbn 13 digits


int  routing(char a[]);               //routing number check

int  issn(char a[]);                  //issn check

int  imei(char a[]);                  //imei check


void version(void);                   //displays the version information
void usage(void);                     //displays the usage information

#endif