1994-12-02 06:40:24 +00:00
|
|
|
#ifdef __FreeBSD__
|
1994-10-07 08:58:58 +00:00
|
|
|
#include <ctype.h>
|
1994-12-02 06:40:24 +00:00
|
|
|
#endif
|
1994-10-07 08:58:58 +00:00
|
|
|
#include <unctrl.h>
|
|
|
|
|
|
|
|
|
|
char *
|
|
|
|
|
unctrl(register unsigned char uch)
|
|
|
|
|
{
|
|
|
|
|
static char buffer[3] = "^x";
|
|
|
|
|
|
1994-12-02 06:40:24 +00:00
|
|
|
#ifdef __FreeBSD__
|
|
|
|
|
if (isprint(uch)) {
|
|
|
|
|
#else
|
|
|
|
|
if ((uch & 0x60) != 0 && uch != 0x7F) {
|
|
|
|
|
#endif
|
1994-10-07 08:58:58 +00:00
|
|
|
/*
|
|
|
|
|
* Printable character. Simply return the character as a one-character
|
|
|
|
|
* string.
|
|
|
|
|
*/
|
|
|
|
|
buffer[1] = uch;
|
|
|
|
|
return &buffer[1];
|
|
|
|
|
}
|
|
|
|
|
uch &= ~0x80;
|
|
|
|
|
/*
|
|
|
|
|
* It is a control character. DEL is handled specially (^?). All others
|
|
|
|
|
* use ^x notation, where x is the character code for the control character
|
|
|
|
|
* with 0x40 ORed in. (Control-A becomes ^A etc.).
|
|
|
|
|
*/ buffer[1] = (uch == 0x7F ? '?' : (uch | 0x40));
|
|
|
|
|
|
|
|
|
|
return buffer;
|
|
|
|
|
|
|
|
|
|
}
|
