showwave.c

   1 #include <stdio.h>
   2
   3 int main_old() {
   4     int ret;
   5     char val;
   6     char *pos = "                                                                                                                                  *";
   7     while ((ret = read(0, &val, 1)) > 0) {
   8         // printf("%d\n", 64 + (val / 2));
   9         printf("%s\n", &(pos[64+(val / 2)]));
  10         fflush(stdout);
  11     }
  12
  13 }
  14
  15 int main() {
  16     int ret, ival;
  17     unsigned char in;
  18     char val;
  19     char *pos = "                                                                                                                                  *";
  20     while ((ret = read(0, &in, 1)) > 0) {
  21         fprintf(stdout, "%u\n", in);
  22         continue;
  23         ival = ival << 1;
  24         fprintf(stdout, "%d\n", *(signed char *)(&ival));
  25         val = *(signed char *)(&ival);
  26         val = val / 2;
  27         fprintf(stdout, "%s\n", &(pos[64+(val/2)]));
  28         write(2,&val,1);
  29         fflush(stdout);
  30     }
  31
  32 }