#include<stdio.h>
#include<stdlib.h>

int cntChars(char *);
char *toLower(char *);

int main(int argc, char **argv)
{
	char temp;
	char *ptrChar;

	if (argc != 2) printf("Should be one command line argument supplied after the file name\n");
	else
	{
		printf("%s\n", ptrChar = toLower(*(argv + 1)));
		free(ptrChar);
	}
		return 0;
}

int cntChars(char *inputString)
{
	// returned value "count" does not include
	// '\0'
	int count = 0;
	while(*(inputString + count) != '\0') ++count;
	return(count);
}

char *toLower(char *inputString)
{
	int count, i;
	char * pChar;
	count = cntChars(inputString);
	if (!(pChar = (char *) malloc(sizeof(char) * (count + 1))))
	{
		fprintf(stderr,"Insufficient memory");
		exit(1);  
	}
	else
	{
		for(i = 0; i <= count; i++)
		{
			if(*(inputString + i) >= 'A' && *(inputString + i) <= 'Z') *(pChar + i) = *(inputString + i) + 32;
			else *(pChar + i) = *(inputString + i);
		}
		return(pChar);
	}
}