/* This file is in the public domain. */

#include <stdio.h>

#include "escaped.h"

/*
 * The routines in this file assume ISO 8859 values of "printable".
 *
 * XXX use locale?
 */

/*
 * Print a string, escaping potentially dangerous stuff.  This is
 *  intended for showing the user strings from the peer, when they're
 *  not trusted to be free of dangerous things like escape sequences.
 *
 * Output is sent to to.  data and len form the data block, except that
 *  if len is greater than maxlen, maxlen is used instead.
 */
void print_escaped(FILE *to, const void *data, int len, int maxlen)
#define dp ((const unsigned char *)data)
{
 int n;
 int i;

 n = len;
 if (n > maxlen) n = maxlen;
 for (i=0;i<n;i++)
  { if (((dp[i] >= 32) && (dp[i] <= 126)) || (dp[i] >= 160))
     { putc(dp[i],to);
     }
    else
     { switch (dp[i])
	{ case '\r': case '\n': case '\t':
	     putc(dp[i],to);
	     break;
	  case '\b':
	     fprintf(to,"BS");
	     break;
	  case '\e':
	     fprintf(to,"ESC");
	     break;
	  default:
	     fprintf(to,"\\%03o",dp[i]);
	     break;
	}
     }
  }
}
#undef dp