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/*

 *      This simple classical example of recursion is useful for

 *      testing stack backtraces and such.

 */

#ifdef vxworks

#  include <stdio.h>

/* VxWorks does not supply atoi.  */

static int

atoi (z)

     char *z;

{

  int i = 0;

  while (*z >= '0' && *z <= '9')

    i = i * 10 + (*z++ - '0');

  return i;

}

/* I don't know of any way to pass an array to VxWorks.  This function

   can be called directly from gdb.  */

vxmain (arg)

char *arg;

{

  char *argv[2];

  argv[0] = "";

  argv[1] = arg;

  main (2, argv, (char **) 0);

}

#else /* ! vxworks */

#  include <stdio.h>

#  include <stdlib.h>

#endif /* ! vxworks */

#ifdef PROTOTYPES

int factorial (int);

int

main (int argc, char **argv, char **envp)

#else

int

main (argc, argv, envp)

int argc;

char *argv[], **envp;

#endif

{

#ifdef usestubs

    set_debug_traps();

    breakpoint();

#endif

#ifdef FAKEARGV

    printf ("%d\n", factorial (1));

#else    

    if (argc != 2) {

        printf ("usage:  factorial <number>\n");

        return 1;

    } else {

        printf ("%d\n", factorial (atoi (argv[1])));

    }

#endif

    return 0;

}

#ifdef PROTOTYPES

int factorial (int value)

#else

int factorial (value) int value;

#endif

{

    int  local_var;

    if (value > 1) {

        value *= factorial (value - 1);

    }

    local_var = value;

    return (value);

}