/////////////////////////////////////////////////////////////////////////////

// jeff_itoa.c

/////////////////////////////////////////////////////////////////////////////

// Copyright (c) 2008, Morning Glory Technologies. All rights reserved.

//

// This program is the property of Morning Glory Technologies. It contains

// valuable proprietary trade secret information and is only for use by duly

// licensed customers. This program may not be copied or transferred to

// any third party without the written permission of Morning Glory

// Technologies.

//

///////////////////////////////////////////////////////////////////////////////

#include <stdio.h>

char *itoa(int);

int main(int argc, char **argv)

{

int iInt = 0;

float fFloat = 0.00;

if( argc < 2 ) {

fprintf(stdout,"\nUsage: %s <String (0-65535.00)>\n", argv[0]);

exit(-1);

}

fFloat = stringToFloat(argv[1]);

iInt = atoi(argv[1]);

fprintf(stdout,"\n%d %f\n", iInt, fFloat);

exit(0);

}

///////////////////////////////////////////////////////////////////////////

float stringToFloat(char *sFloat)

{

float fString = 0.00;

float fMagnitute = 1.00;

char *pFloat;

int Decimal = 0;

int Valid = 0;

if( sFloat == (char *) '\0') {

goto INVALID;

}

//find the magntitue of a whole number

pFloat = sFloat;

while( *sFloat ) {

if (*sFloat == '.') {

goto BREAK;

}

fMagnitute *= 10;

sFloat++;

}

BREAK:

fMagnitute /= 10;

sFloat = pFloat;

while( *sFloat) {

//switch arithmetic operations

if( *sFloat == '.') {

Decimal = 1;

fMagnitute = 10.00;

}

if( *sFloat >= '0') {

if( *sFloat <= '9') {

Valid = 1;

}

}

if( Valid ) {

if( !Decimal) {

fString += (*sFloat - '0') * fMagnitute;

fMagnitute /= 10.00;

}

if( Decimal) {

fString += (*sFloat - '0') / fMagnitute;

fMagnitute *= 10.00;

}

}

if( !Valid) {

if( *sFloat != '.') {

fString /= 10;

goto INVALID;

}

}

Valid = 0;

sFloat++;

}

INVALID:

return(fString);

}

///////////////////////////////////////////////////////////////////////////

char *itoa(iInput)

{

char *pReverse;

if( !(pReverse = (char *)calloc(5,sizeof(char)) )) {

fprintf(stderr,"\nCan`t allocate 5 bytes\n");

return( (char *)'0' );

}

//METHOD 1: just use sprintf...

//sprintf(pReverse,"%d",iInput);

//return(pReverse);

//METHOD 2: re-write sprintf...

int iSave = iInput;

int iSave2;

char *pSavePtr;

pSavePtr = pReverse;

// use subtraction to get units digit.

while( iSave ) {

if( iSave == iInput) {

iSave2 = (iInput / 10) * 10;

fprintf(stdout,"iSave: %d diff: %d\n", iInput, iInput - iSave2);

*pReverse = (char )(iInput - iSave2) + '0';

}

if( iSave != iInput ) {

iSave2 = (iSave / 10) * 10;

fprintf(stdout,"iSave: %d diff: %d\n", iSave, iSave - iSave2);

*pReverse = (char )(iSave - iSave2) + '0';

}

pReverse++;

iSave /= 10;

}

// reverse the string order

char *pRet;

if( !(pRet = (char *)calloc(5,sizeof(char)) )) {

fprintf(stderr,"\nCan`t allocate 5 bytes\n");

return( (char *)'0' );

}

while( pReverse-- >= pSavePtr ) {

strncat(pRet,pReverse,1);

}

free (*pReverse);

return( pRet );

}