mc/slang/slgetkey.c

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1998-02-27 07:54:42 +03:00
/* Copyright (c) 1992, 1995 John E. Davis
* All rights reserved.
*
* You may distribute under the terms of either the GNU General Public
* License or the Perl Artistic License.
*/
#include "config.h"
#include <stdio.h>
#include "_slang.h"
unsigned int SLang_Input_Buffer_Len = 0;
unsigned char SLang_Input_Buffer [MAX_INPUT_BUFFER_LEN];
int SLang_Abort_Char = 7;
int SLang_Ignore_User_Abort = 0;
/* This has the effect of mapping all characters in the range 128-169 to
* ESC [ something
*/
#ifndef __GO32__
# if defined(__unix__) || defined(vms)
# define DEC_8BIT_HACK 64
# endif
#endif
#ifdef OS2_NT /* see the replacement in src/slint.c */
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unsigned int SLang_getkey (void)
{
unsigned int imax;
unsigned int ch;
if (SLang_Input_Buffer_Len)
{
ch = (unsigned int) *SLang_Input_Buffer;
SLang_Input_Buffer_Len--;
imax = SLang_Input_Buffer_Len;
SLMEMCPY ((char *) SLang_Input_Buffer,
(char *) (SLang_Input_Buffer + 1), imax);
}
else if (0xFFFF == (ch = SLsys_getkey ())) return ch;
#ifdef DEC_8BIT_HACK
if (ch & 0x80)
{
unsigned char i;
i = (unsigned char) (ch & 0x7F);
if (i < ' ')
{
i += DEC_8BIT_HACK;
SLang_ungetkey (i);
ch = 27;
}
}
#endif
return(ch);
}
#endif /* OS2_NT */
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void SLang_ungetkey_string (unsigned char *s, unsigned int n)
{
register unsigned char *bmax, *b, *b1;
if (SLang_Input_Buffer_Len + n + 3 > MAX_INPUT_BUFFER_LEN) return;
b = SLang_Input_Buffer;
bmax = (b - 1) + SLang_Input_Buffer_Len;
b1 = bmax + n;
while (bmax >= b) *b1-- = *bmax--;
bmax = b + n;
while (b < bmax) *b++ = *s++;
SLang_Input_Buffer_Len += n;
}
void SLang_buffer_keystring (unsigned char *s, unsigned int n)
{
if (n + SLang_Input_Buffer_Len + 3 > MAX_INPUT_BUFFER_LEN) return;
SLMEMCPY ((char *) SLang_Input_Buffer + SLang_Input_Buffer_Len,
(char *) s, n);
SLang_Input_Buffer_Len += n;
}
void SLang_ungetkey (unsigned char ch)
{
SLang_ungetkey_string(&ch, 1);
}
#ifdef OS2_NT /* see the replacement in src/slint.c */
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int SLang_input_pending (int tsecs)
{
int n;
unsigned char c;
if (SLang_Input_Buffer_Len) return (int) SLang_Input_Buffer_Len;
n = SLsys_input_pending (tsecs);
if (n <= 0) return 0;
c = (unsigned char) SLang_getkey ();
SLang_ungetkey_string (&c, 1);
return n;
}
#endif /* OS2_NT */
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void SLang_flush_input (void)
{
int quit = SLKeyBoard_Quit;
SLang_Input_Buffer_Len = 0;
SLKeyBoard_Quit = 0;
while (SLsys_input_pending (0) > 0)
{
(void) SLsys_getkey ();
/* Set this to 0 because SLsys_getkey may stuff keyboard buffer if
* key sends key sequence (OS/2, DOS, maybe VMS).
*/
SLang_Input_Buffer_Len = 0;
}
SLKeyBoard_Quit = quit;
}