//John T. Rine
//September 10, 2011

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

int cntChars(char *);
char *append(char, char *);

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

	if (argc == 1) printf("Should be at least one command line argument supplied after the file name\n");
	else
	{
		//only appends to first argument after filename
		printf("Enter a character to append to the string supplied on the command line\n");
		temp = getchar();
		printf("%s\n", ptrChar = append(temp, *(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 *append(char inputChar, char *inputString)
{
	//element      0    1    2
	//count = 0   '\0'
	//count = 1    A   '\0'
	//count = 2    M    y   '\0'

	int count, i;
	char * pChar;
	count = cntChars(inputString);
	if (!(pChar = (char *) malloc(sizeof(char) * (count + 2))))
	{
		fprintf(stderr,"Insufficient memory");
		exit(1);  
	}
	else
	{
		for(i = 0; i <= (count - 1); i++) *(pChar + i) = *(inputString + i);
		*(pChar + count) = inputChar;
		if(inputChar != '\0') *(pChar + count + 1) = '\0';
		return(pChar);
	}
}