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

/******************************************************************
Name:		GetDynstr
Descr:		Prompts user for a string, and input string, upto any length
Params:		Prompt = Prompt to display before input, may be NULL
Returns:	Dynamically-allocate string with user's input
Note:		Caller is responsible for freeing memory.
******************************************************************/
char* GetDynStr( char* Prompt )
{
	char *P = calloc(1,sizeof(char));
	int Ch, Size=1;

	if( P )
	{
		if( Prompt )
			printf( "%s", Prompt );
		while( (Ch=getchar()) != '\n' && Ch != EOF )
		{
			char *Tmp;
			Tmp = realloc( P, Size+1 ); // +1 for new character, and terminator
			if( !Tmp )
			{
				free( P );
				return( NULL );
			}
			P = Tmp;
			P[Size-1]=Ch;
			P[Size++]='\0';
		}
	}
	return(P);
}
void main()
{
	char *Str;
	if( (Str=GetDynStr( "Enter Name: " )) !=NULL )
	{
		printf("Hello %s\n", Str );
		free( Str );
	}
	else
		printf("Error: out of memory\n");
}