#include <stdio.h>
#include "mcs360.h"


/* void err_mesg( const char *function, const char *mesg).
      Displays the string
           Error in (function): (message)
      where (function) and (mesg) denote the values of the
      values of the string parameters function and mesg,
      and then terminates the program.
*/

void err_mesg( const char *function, const char *mesg)
{
   fprintf( stderr, "\nError in %s: %s\n",
            function, mesg);
   exit(1);
}


/* void *checked_malloc( size_t size).
      Invoked exactly like C library function malloc().
      Calls malloc() to allocate the memory and then checks
      the return value of malloc() and terminates the
      program if it is null.
*/

void *checked_malloc( size_t size)
{
   void *addr = malloc(size);
   if ( addr == NULL ) {
      char mesg[60];
      sprintf( mesg, "Requested memory (%u bytes) could not be allocated.", size);
      err_mesg( "checked_malloc()", mesg);
   }
   return addr;
}


/* void *checked_malloc( size_t size).
      Invoked exactly like C library function realloc().
      Calls realloc() to resize the memory allocation and
      then checks the return value of realloc() and terminates
      the program if it is null.  To resize a dynamic array a
      with element type T to a new size of n (elements), use
          a = (T *)checked_realloc( n*sizeof(T));
      Note this won't work completely if there are other
      pointers into the dynamic array.
*/

void *checked_realloc( void *old_addr, size_t new_size) {
   void *new_addr = realloc( old_addr, new_size);
   if ( new_addr == NULL ) {
      char mesg[60];
      sprintf( mesg, "Requested memory (%u bytes) could not be allocated.", new_size);
      err_mesg( "checked_realloc()", mesg);
   }
   return new_addr;
}