/*
 *  =====================================================================
 *  argalloc.c -- demonstrate use of string functions
 *                                                                     
 *  Copyright (C) 1998 by Mark Austin and David Chancogne.
 *                                                                     
 *  This software is provided "as is" without express or implied warranty.
 *  Permission is granted to use this software on any computer system,
 *  and to redistribute it freely, subject to the following restrictions:
 * 
 *  1. The authors are not responsible for the consequences of use of
 *     this software, even if they arise from defects in the software.
 *  2. The origin of this software must not be misrepresented, either
 *     by explicit claim or by omission.
 *  3. Altered versions must be plainly marked as such, and must not
 *     be misrepresented as being the original software.
 *  4. This notice is to remain intact.
 * 
 *  Written by : Mark Austin 
 *  =====================================================================
 */

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

int main( void ) {
enum  { MaxString = 20 };              /* allocate enough for long string */
char  caString[MaxString] = "myfile";  /* compile-time allocation         */
char* cpStringExt = ".dat";            /* point to extension              */
char  caNewExtension[MaxString];       /* read in at run time            */
char* cpNew;                           /* assigned dynamically below     */

   /* [a] : copy the extension referred to by cpStringExt onto the end of  */
   /*       the string contained in (ultimately referred to by) caString   */

   strcat( caString, cpStringExt );
   printf( "\nThe concatenated file name is %s\n", caString );

   /* [b] : reset caString to its original state ("myfile") */

   strcpy( caString, "myfile" );

   /* [c] : dynamically request a new file extension */

   printf( "\nEnter another file extension (<20 characters long):" );
   scanf( "%s", caNewExtension );

   /* [d] : dynamically allocate the necessary space at run time */

   cpNew = (char*) malloc( strlen(caString) + strlen(caNewExtension) + 1 );
   if( NULL == cpNew ) { /* allocation failure */
       printf("\n");
       printf("Memory allocation failure in file %s, line %i\n",
               __FILE__, __LINE__ );
       return 1; 
   }

   /* [e] : copy in source string and concatenate the extension */

   strcpy( cpNew, caString );
   strcat( cpNew, caNewExtension );
   printf( "\nThe concatenated file name is %s\n", cpNew );

   return 0;
}