fpmagic.c

#include <stdlib.h>
#include <unistd.h>

#define BUFSIZE 1024

int main()
{
  /* Pipe text into me! */

  char data[BUFSIZE + 4];
  ssize_t len;

  while ((len = read(STDIN_FILENO, data + 4, BUFSIZE))) {
    char *d = data;
    float *z = (float *)(data + len + 1);
    for (int k = 0; k < 4; k++) {
      for (float *p = (float *)(++d); p < z; p++) {
        *p *= *p >= 1.47573952589676412928e20f ? 5.421010862427522e-20f : 1.0f;
      }
    }

    write(STDOUT_FILENO, d, len);
  }

  return EXIT_SUCCESS;
}