/* uncview.c -- Filter Recovering Contrl-Codes Visualized by "cview/cviewe" */
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>

int main(int argc, char *argv[])
{ int c;
  FILE *fp;
# ifdef O_BINARY
  setmode(1,O_BINARY);
# endif
  if (argc == 1) {
    fp = stdin;
# ifdef O_BINARY
    setmode(0,O_BINARY);
# endif
  } else if ((fp=fopen(argv[1],"rb")) == NULL) {
    fprintf(stderr, "file %s not found\n", argv[1]); exit(1);
  }
  while ((c=getc(fp)) != EOF) {
    if (c < 0x20) continue;
    else if (c == '!') c = (getc(fp) | 0x80);
    else if (c == '\\') c = getc(fp);
    else if (c == '^') {
      c = getc(fp);
      if (c >= 0x60) c = ((c & 0x1f) | 0x80);
      else if (c >= '@') c = (c & 0x1f);
      else if (c == '?') c = 0x7f;
      else if (c == '#') c = 0x9f;
      else if (c == '$') c = 0xa0;
      else if (c == '/') c = 0xff;
    }
    putchar(c);
  }
  fclose(fp); fclose(stdout);
  return(0);
}