/*  numa.c  --  take stream of decimal numbers off stdin and put the
                corresponding stream of ascii codes to stdout according
                to the formula  n + base
    Usage:   numa [base]

             If "base" is not specified on the command line, it defaults
             to BASE.
                                                                           */

#define BASE     0
#define MAXC   255                        /*  max ascii code               */
#define ASCLF   10
#include <stdio.h>
#include <stdlib.h>
main(argc,argv)
int argc;
char **argv;
{
int base, chx, num, onum, pchx;
if( (argc != 1) && (argc !=2) )
   {
   printf("  %s: One optional argument \"base\" -- defaults to %d.\n",
           argv[0], BASE);
   exit(20);
   }
base = BASE;
if(argc==2)
   {
   base = atoi(argv[1]);
   if(base < 0)
      {
      printf("  %s: Argument \"base\" cannot be negative.\n", argv[0]);
      exit(21);
      }
   if(base > MAXC)
      {
      printf("  %s: Argument \"base\" may not exceed %d.\n", argv[0], MAXC);
      exit(22);
      }
   }
num = 0;
pchx = '\n';
while( (chx=getc(stdin)) != EOF )
   {
   if( (chx == ' ') || (chx == '\n') )
      {
      if(num > 0)
         {
         onum = num + base;
         if(onum <= MAXC)
            {
            putchar(onum);
            num = 0;
            }
         else
            {
            fprintf(stderr,"\n  %s: Code too high -- %d\n", argv[0], num);
            exit(5);
            }
         }
      if(chx == '\n') putchar('\n');
      }
   else
      {
      if( (chx < '0') || (chx > '9') )
         {
         fprintf(stderr,"\n  %s: Bad input -- %c (hex %x)\n",argv[0],chx,chx);
         exit(5);
         }
      num = 10*num + (chx - '0');
      }
   pchx = chx;
   }
if ( (pchx != '\n') && (onum != ASCLF) ) putchar('\n');
exit(0);
}