unctrl.c

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/****************************************************************/
/* Unctrl() routines of the PCcurses package                    */
/*                                                              */
/****************************************************************/
/* This version of curses is based on ncurses, a curses version */
/* Originally written by Pavel Curtis at Cornell University.    */
/* I have made substantial changes to make it run on IBM PC's,  */
/* And therefore consider myself free to make it public domain. */
/*              Bjorn Larsson (...mcvax!enea!infovax!bl)        */
/****************************************************************/
/* 1.0: Release:                                        870515  */
/****************************************************************/
/* Modified to run under the MINIX operating system by Don Cope */
/* These changes are also released into the public domain.      */
/*                                                      900906  */
/****************************************************************/

#include <curses.h>
#include "curspriv.h"

static char strbuf[3] = {0, 0, 0};

/****************************************************************/
/* Unctrl() returns a char pointer to a string corresponding to */
/* Argument character 'c'.                                      */
/****************************************************************/

char *unctrl(c)
char c;
{
  int ic = c;
  ic &= 0xff;

  if ((ic >= ' ') && (ic != 0x7f)) {    /* normal characters */
        strbuf[0] = ic;
        strbuf[1] = '\0';
        return(strbuf);
  }                             /* if */
  strbuf[0] = '^';              /* '^' prefix */
  if (c == 0x7f)                /* DEL */
        strbuf[1] = '?';
  else                          /* other control */
        strbuf[1] = ic + '@';
  return(strbuf);
}                               /* unctrl */

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