/* SLang Screen management routines */
/* Copyright (c) 1992, 1999, 2001 John E. Davis
* This file is part of the S-Lang library.
*
* You may distribute under the terms of either the GNU General Public
* License or the Perl Artistic License.
*/
#include "slinclud.h"
#include "slang.h"
#include "_slang.h"
typedef struct Screen_Type
{
int n; /* number of chars written last time */
int flags; /* line untouched, etc... */
SLsmg_Char_Type *old, *neew;
#ifndef IBMPC_SYSTEM
unsigned long old_hash, new_hash;
#endif
}
Screen_Type;
#define TOUCHED 0x1
#define TRASHED 0x2
static int Screen_Trashed;
#if !defined(__MSDOS_16BIT__)
# define MAX_SCREEN_SIZE 256
#else
# define MAX_SCREEN_SIZE 75
#endif
Screen_Type SL_Screen[MAX_SCREEN_SIZE];
static int Start_Col, Start_Row;
static int Screen_Cols, Screen_Rows;
static int This_Row, This_Col;
static int This_Color; /* only the first 8 bits of this
* are used. The highest bit is used
* to indicate an alternate character
* set. This leaves 127 userdefineable
* color combination.
*/
#ifndef IBMPC_SYSTEM
#define ALT_CHAR_FLAG 0x80
#else
#define ALT_CHAR_FLAG 0x00
#endif
#if SLTT_HAS_NON_BCE_SUPPORT && !defined(IBMPC_SYSTEM)
#define REQUIRES_NON_BCE_SUPPORT 1
static int Bce_Color_Offset;
#endif
int SLsmg_Newline_Behavior = 0;
int SLsmg_Backspace_Moves = 0;
/* Backward compatibility. Not used. */
/* int SLsmg_Newline_Moves; */
static void (*tt_normal_video)(void) = SLtt_normal_video;
static void (*tt_goto_rc)(int, int) = SLtt_goto_rc;
static void (*tt_cls) (void) = SLtt_cls;
static void (*tt_del_eol) (void) = SLtt_del_eol;
static void (*tt_smart_puts) (SLsmg_Char_Type *, SLsmg_Char_Type *, int, int) = SLtt_smart_puts;
static int (*tt_flush_output) (void) = SLtt_flush_output;
static int (*tt_reset_video) (void) = SLtt_reset_video;
static int (*tt_init_video) (void) = SLtt_init_video;
static int *tt_Screen_Rows = &SLtt_Screen_Rows;
static int *tt_Screen_Cols = &SLtt_Screen_Cols;
#ifndef IBMPC_SYSTEM
static void (*tt_set_scroll_region)(int, int) = SLtt_set_scroll_region;
static void (*tt_reverse_index)(int) = SLtt_reverse_index;
static void (*tt_reset_scroll_region)(void) = SLtt_reset_scroll_region;
static void (*tt_delete_nlines)(int) = SLtt_delete_nlines;
#endif
#ifndef IBMPC_SYSTEM
static int *tt_Term_Cannot_Scroll = &SLtt_Term_Cannot_Scroll;
static int *tt_Has_Alt_Charset = &SLtt_Has_Alt_Charset;
static char **tt_Graphics_Char_Pairs = &SLtt_Graphics_Char_Pairs;
static int *tt_Use_Blink_For_ACS = &SLtt_Use_Blink_For_ACS;
#endif
static int Smg_Inited;
static void blank_line (SLsmg_Char_Type *p, int n, unsigned char ch)
{
register SLsmg_Char_Type *pmax = p + n;
register SLsmg_Char_Type color_ch;
color_ch = SLSMG_BUILD_CHAR(ch,This_Color);
while (p < pmax)
{
*p++ = color_ch;
}
}
static void clear_region (int row, int n)
{
int i;
int imax = row + n;
if (imax > Screen_Rows) imax = Screen_Rows;
for (i = row; i < imax; i++)
{
if (i >= 0)
{
blank_line (SL_Screen[i].neew, Screen_Cols, ' ');
SL_Screen[i].flags |= TOUCHED;
}
}
}
void SLsmg_erase_eol (void)
{
int r, c;
if (Smg_Inited == 0) return;
c = This_Col - Start_Col;
r = This_Row - Start_Row;
if ((r < 0) || (r >= Screen_Rows)) return;
if (c < 0) c = 0; else if (c >= Screen_Cols) return;
blank_line (SL_Screen[This_Row].neew + c , Screen_Cols - c, ' ');
SL_Screen[This_Row].flags |= TOUCHED;
}
static void scroll_up (void)
{
unsigned int i, imax;
SLsmg_Char_Type *neew;
neew = SL_Screen[0].neew;
imax = Screen_Rows - 1;
for (i = 0; i < imax; i++)
{
SL_Screen[i].neew = SL_Screen[i + 1].neew;
SL_Screen[i].flags |= TOUCHED;
}
SL_Screen[i].neew = neew;
SL_Screen[i].flags |= TOUCHED;
blank_line (neew, Screen_Cols, ' ');
This_Row--;
}
void SLsmg_gotorc (int r, int c)
{
This_Row = r;
This_Col = c;
}
int SLsmg_get_row (void)
{
return This_Row;
}
int SLsmg_get_column (void)
{
return This_Col;
}
void SLsmg_erase_eos (void)
{
if (Smg_Inited == 0) return;
SLsmg_erase_eol ();
clear_region (This_Row + 1, Screen_Rows);
}
static int This_Alt_Char;
void SLsmg_set_char_set (int i)
{
#ifdef IBMPC_SYSTEM
(void) i;
#else
if ((tt_Use_Blink_For_ACS != NULL)
&& (*tt_Use_Blink_For_ACS != 0))
return;/* alt chars not used and the alt bit
* is used to indicate a blink.
*/
if (i) This_Alt_Char = ALT_CHAR_FLAG;
else This_Alt_Char = 0;
This_Color &= 0x7F;
This_Color |= This_Alt_Char;
#endif
}
void SLsmg_set_color (int color)
{
if (color < 0) return;
#ifdef REQUIRES_NON_BCE_SUPPORT
color += Bce_Color_Offset;
#endif
This_Color = color | This_Alt_Char;
}
void SLsmg_reverse_video (void)
{
SLsmg_set_color (1);
}
void SLsmg_normal_video (void)
{
SLsmg_set_color (0);
}
static int point_visible (int col_too)
{
return ((This_Row >= Start_Row) && (This_Row < Start_Row + Screen_Rows)
&& ((col_too == 0)
|| ((This_Col >= Start_Col)
&& (This_Col < Start_Col + Screen_Cols))));
}
void SLsmg_write_string (char *str)
{
SLsmg_write_nchars (str, strlen (str));
}
void SLsmg_write_nstring (char *str, unsigned int n)
{
unsigned int width;
char blank = ' ';
/* Avoid a problem if a user accidently passes a negative value */
if ((int) n < 0)
return;
if (str == NULL) width = 0;
else
{
width = strlen (str);
if (width > n) width = n;
SLsmg_write_nchars (str, width);
}
while (width++ < n) SLsmg_write_nchars (&blank, 1);
}
void SLsmg_write_wrapped_string (char *s, int r, int c,
unsigned int dr, unsigned int dc,
int fill)
{
register char ch, *p;
int maxc = (int) dc;
if ((dr == 0) || (dc == 0)) return;
p = s;
dc = 0;
while (1)
{
ch = *p++;
if ((ch == 0) || (ch == '\n'))
{
int diff;
diff = maxc - (int) dc;
SLsmg_gotorc (r, c);
SLsmg_write_nchars (s, dc);
if (fill && (diff > 0))
{
while (diff--) SLsmg_write_char (' ');
}
if ((ch == 0) || (dr == 1)) break;
r++;
dc = 0;
dr--;
s = p;
}
else if ((int) dc == maxc)
{
SLsmg_gotorc (r, c);
SLsmg_write_nchars (s, dc + 1);
if (dr == 1) break;
r++;
dc = 0;
dr--;
s = p;
}
else dc++;
}
}
int SLsmg_Tab_Width = 8;
/* Minimum value for which eight bit char is displayed as is. */
#ifndef IBMPC_SYSTEM
int SLsmg_Display_Eight_Bit = 160;
static unsigned char Alt_Char_Set[129];/* 129th is used as a flag */
#else
int SLsmg_Display_Eight_Bit = 128;
#endif
void SLsmg_write_nchars (char *str, unsigned int n)
{
register SLsmg_Char_Type *p, old, neew, color;
unsigned char ch;
unsigned int flags;
int len, start_len, max_len;
char *str_max;
int newline_flag;
#ifndef IBMPC_SYSTEM
int alt_char_set_flag;
alt_char_set_flag = ((This_Color & ALT_CHAR_FLAG)
&& ((tt_Use_Blink_For_ACS == NULL)
|| (*tt_Use_Blink_For_ACS == 0)));
#endif
if (Smg_Inited == 0) return;
str_max = str + n;
color = This_Color;
top: /* get here only on newline */
newline_flag = 0;
start_len = Start_Col;
if (point_visible (0) == 0) return;
len = This_Col;
max_len = start_len + Screen_Cols;
p = SL_Screen[This_Row - Start_Row].neew;
if (len > start_len) p += (len - start_len);
flags = SL_Screen[This_Row - Start_Row].flags;
while ((len < max_len) && (str < str_max))
{
ch = (unsigned char) *str++;
#ifndef IBMPC_SYSTEM
if (alt_char_set_flag)
ch = Alt_Char_Set [ch & 0x7F];
#endif
if (((ch >= ' ') && (ch < 127))
|| (ch >= (unsigned char) SLsmg_Display_Eight_Bit)
#ifndef IBMPC_SYSTEM
|| alt_char_set_flag
#endif
)
{
len += 1;
if (len > start_len)
{
old = *p;
neew = SLSMG_BUILD_CHAR(ch,color);
if (old != neew)
{
flags |= TOUCHED;
*p = neew;
}
p++;
}
}
else if ((ch == '\t') && (SLsmg_Tab_Width > 0))
{
n = len;
n += SLsmg_Tab_Width;
n = SLsmg_Tab_Width - (n % SLsmg_Tab_Width);
if ((unsigned int) len + n > (unsigned int) max_len)
n = (unsigned int) (max_len - len);
neew = SLSMG_BUILD_CHAR(' ',color);
while (n--)
{
len += 1;
if (len > start_len)
{
if (*p != neew)
{
flags |= TOUCHED;
*p = neew;
}
p++;
}
}
}
else if ((ch == '\n')
&& (SLsmg_Newline_Behavior != SLSMG_NEWLINE_PRINTABLE))
{
newline_flag = 1;
break;
}
else if ((ch == 0x8) && SLsmg_Backspace_Moves)
{
if (len != 0) len--;
}
else
{
if (ch & 0x80)
{
neew = SLSMG_BUILD_CHAR('~',color);
len += 1;
if (len > start_len)
{
if (*p != neew)
{
*p = neew;
flags |= TOUCHED;
}
p++;
if (len == max_len) break;
ch &= 0x7F;
}
}
len += 1;
if (len > start_len)
{
neew = SLSMG_BUILD_CHAR('^',color);
if (*p != neew)
{
*p = neew;
flags |= TOUCHED;
}
p++;
if (len == max_len) break;
}
if (ch == 127) ch = '?'; else ch = ch + '@';
len++;
if (len > start_len)
{
neew = SLSMG_BUILD_CHAR(ch,color);
if (*p != neew)
{
*p = neew;
flags |= TOUCHED;
}
p++;
}
}
}
SL_Screen[This_Row - Start_Row].flags = flags;
This_Col = len;
if (SLsmg_Newline_Behavior == 0)
return;
if (newline_flag == 0)
{
while (str < str_max)
{
if (*str == '\n') break;
str++;
}
if (str == str_max) return;
str++;
}
This_Row++;
This_Col = 0;
if (This_Row == Start_Row + Screen_Rows)
{
if (SLsmg_Newline_Behavior == SLSMG_NEWLINE_SCROLLS) scroll_up ();
}
goto top;
}
void SLsmg_write_char (char ch)
{
SLsmg_write_nchars (&ch, 1);
}
static int Cls_Flag;
void SLsmg_cls (void)
{
int tac;
if (Smg_Inited == 0) return;
tac = This_Alt_Char; This_Alt_Char = 0;
SLsmg_set_color (0);
clear_region (0, Screen_Rows);
This_Alt_Char = tac;
SLsmg_set_color (0);
Cls_Flag = 1;
}
#if 0
static void do_copy (SLsmg_Char_Type *a, SLsmg_Char_Type *b)
{
SLsmg_Char_Type *amax = a + Screen_Cols;
while (a < amax) *a++ = *b++;
}
#endif
#ifndef IBMPC_SYSTEM
int SLsmg_Scroll_Hash_Border = 0;
static unsigned long compute_hash (SLsmg_Char_Type *s, int n)
{
register unsigned long h = 0, g;
register unsigned long sum = 0;
register SLsmg_Char_Type *smax, ch;
int is_blank = 2;
s += SLsmg_Scroll_Hash_Border;
smax = s + (n - SLsmg_Scroll_Hash_Border);
while (s < smax)
{
ch = *s++;
if (is_blank && (SLSMG_EXTRACT_CHAR(ch) != 32)) is_blank--;
sum += ch;
h = sum + (h << 3);
if ((g = h & 0xE0000000UL) != 0)
{
h = h ^ (g >> 24);
h = h ^ g;
}
}
if (is_blank) return 0;
return h;
}
static unsigned long Blank_Hash;
static int try_scroll_down (int rmin, int rmax)
{
int i, r1, r2, di, j;
unsigned long hash;
int did_scroll;
int color;
SLsmg_Char_Type *tmp;
int ignore;
did_scroll = 0;
for (i = rmax; i > rmin; i--)
{
hash = SL_Screen[i].new_hash;
if (hash == Blank_Hash) continue;
if ((hash == SL_Screen[i].old_hash)
#if 0
|| ((i + 1 < Screen_Rows) && (hash == SL_Screen[i + 1].old_hash))
|| ((i - 1 > rmin) && (SL_Screen[i].old_hash == SL_Screen[i - 1].new_hash))
#endif
)
continue;
for (j = i - 1; j >= rmin; j--)
{
if (hash == SL_Screen[j].old_hash) break;
}
if (j < rmin) continue;
r2 = i; /* end scroll region */
di = i - j;
j--;
ignore = 0;
while ((j >= rmin) && (SL_Screen[j].old_hash == SL_Screen[j + di].new_hash))
{
if (SL_Screen[j].old_hash == Blank_Hash) ignore++;
j--;
}
r1 = j + 1;
/* If this scroll only scrolls this line into place, don't do it.
*/
if ((di > 1) && (r1 + di + ignore == r2)) continue;
/* If there is anything in the scrolling region that is ok, abort the
* scroll.
*/
for (j = r1; j <= r2; j++)
{
if ((SL_Screen[j].old_hash != Blank_Hash)
&& (SL_Screen[j].old_hash == SL_Screen[j].new_hash))
{
/* See if the scroll is happens to scroll this one into place. */
if ((j + di > r2) || (SL_Screen[j].old_hash != SL_Screen[j + di].new_hash))
break;
}
}
if (j <= r2) continue;
color = This_Color; This_Color = 0;
did_scroll = 1;
(*tt_normal_video) ();
(*tt_set_scroll_region) (r1, r2);
(*tt_goto_rc) (0, 0);
(*tt_reverse_index) (di);
(*tt_reset_scroll_region) ();
/* Now we have a hole in the screen.
* Make the virtual screen look like it.
*
* Note that if the terminal does not support BCE, then we have
* no idea what color the hole is. So, for this case, we do not
* want to add Bce_Color_Offset to This_Color since if Bce_Color_Offset
* is non-zero, then This_Color = 0 does not match any valid color
* obtained by adding Bce_Color_Offset.
*/
for (j = r1; j <= r2; j++) SL_Screen[j].flags = TOUCHED;
while (di--)
{
tmp = SL_Screen[r2].old;
for (j = r2; j > r1; j--)
{
SL_Screen[j].old = SL_Screen[j - 1].old;
SL_Screen[j].old_hash = SL_Screen[j - 1].old_hash;
}
SL_Screen[r1].old = tmp;
blank_line (SL_Screen[r1].old, Screen_Cols, ' ');
SL_Screen[r1].old_hash = Blank_Hash;
r1++;
}
This_Color = color;
}
return did_scroll;
}
static int try_scroll_up (int rmin, int rmax)
{
int i, r1, r2, di, j;
unsigned long hash;
int did_scroll;
int color;
SLsmg_Char_Type *tmp;
int ignore;
did_scroll = 0;
for (i = rmin; i < rmax; i++)
{
hash = SL_Screen[i].new_hash;
if (hash == Blank_Hash) continue;
if (hash == SL_Screen[i].old_hash)
continue;
/* find a match further down screen */
for (j = i + 1; j <= rmax; j++)
{
if (hash == SL_Screen[j].old_hash) break;
}
if (j > rmax) continue;
r1 = i; /* beg scroll region */
di = j - i; /* number of lines to scroll */
j++; /* since we know this is a match */
/* find end of scroll region */
ignore = 0;
while ((j <= rmax) && (SL_Screen[j].old_hash == SL_Screen[j - di].new_hash))
{
if (SL_Screen[j].old_hash == Blank_Hash) ignore++;
j++;
}
r2 = j - 1; /* end of scroll region */
/* If this scroll only scrolls this line into place, don't do it.
*/
if ((di > 1) && (r1 + di + ignore == r2)) continue;
/* If there is anything in the scrolling region that is ok, abort the
* scroll.
*/
for (j = r1; j <= r2; j++)
{
if ((SL_Screen[j].old_hash != Blank_Hash)
&& (SL_Screen[j].old_hash == SL_Screen[j].new_hash))
{
if ((j - di < r1) || (SL_Screen[j].old_hash != SL_Screen[j - di].new_hash))
break;
}
}
if (j <= r2) continue;
did_scroll = 1;
/* See the above comments about BCE */
color = This_Color; This_Color = 0;
(*tt_normal_video) ();
(*tt_set_scroll_region) (r1, r2);
(*tt_goto_rc) (0, 0); /* relative to scroll region */
(*tt_delete_nlines) (di);
(*tt_reset_scroll_region) ();
/* Now we have a hole in the screen. Make the virtual screen look
* like it.
*/
for (j = r1; j <= r2; j++) SL_Screen[j].flags = TOUCHED;
while (di--)
{
tmp = SL_Screen[r1].old;
for (j = r1; j < r2; j++)
{
SL_Screen[j].old = SL_Screen[j + 1].old;
SL_Screen[j].old_hash = SL_Screen[j + 1].old_hash;
}
SL_Screen[r2].old = tmp;
blank_line (SL_Screen[r2].old, Screen_Cols, ' ');
SL_Screen[r2].old_hash = Blank_Hash;
r2--;
}
This_Color = color;
}
return did_scroll;
}
static void try_scroll (void)
{
int r1, rmin, rmax;
int num_up, num_down;
/* find region limits. */
for (rmax = Screen_Rows - 1; rmax > 0; rmax--)
{
if (SL_Screen[rmax].new_hash != SL_Screen[rmax].old_hash)
{
r1 = rmax - 1;
if ((r1 == 0)
|| (SL_Screen[r1].new_hash != SL_Screen[r1].old_hash))
break;
rmax = r1;
}
}
for (rmin = 0; rmin < rmax; rmin++)
{
if (SL_Screen[rmin].new_hash != SL_Screen[rmin].old_hash)
{
r1 = rmin + 1;
if ((r1 == rmax)
|| (SL_Screen[r1].new_hash != SL_Screen[r1].old_hash))
break;
rmin = r1;
}
}
/* Below, we have two scrolling algorithms. The first has the effect of
* scrolling lines down. This is usually appropriate when one moves
* up the display, e.g., with the UP arrow. The second algorithm is
* appropriate for going the other way. It is important to choose the
* correct one.
*/
num_up = 0;
for (r1 = rmin; r1 < rmax; r1++)
{
if (SL_Screen[r1].new_hash == SL_Screen[r1 + 1].old_hash)
num_up++;
}
num_down = 0;
for (r1 = rmax; r1 > rmin; r1--)
{
if (SL_Screen[r1 - 1].old_hash == SL_Screen[r1].new_hash)
num_down++;
}
if (num_up > num_down)
{
if (try_scroll_up (rmin, rmax))
return;
(void) try_scroll_down (rmin, rmax);
}
else
{
if (try_scroll_down (rmin, rmax))
return;
(void) try_scroll_up (rmin, rmax);
}
}
#endif /* NOT IBMPC_SYSTEM */
#ifdef REQUIRES_NON_BCE_SUPPORT
static void adjust_colors (void)
{
int bce;
int i;
bce = Bce_Color_Offset;
Bce_Color_Offset = _SLtt_get_bce_color_offset ();
if (bce == Bce_Color_Offset)
return;
if ((tt_Use_Blink_For_ACS != NULL)
&& (*tt_Use_Blink_For_ACS != 0))
return; /* this mode does not support non-BCE
* terminals.
*/
for (i = 0; i < Screen_Rows; i++)
{
SLsmg_Char_Type *s, *smax;
SL_Screen[i].flags |= TRASHED;
s = SL_Screen[i].neew;
smax = s + Screen_Cols;
while (s < smax)
{
int color = (int) SLSMG_EXTRACT_COLOR(*s);
int acs;
if (color < 0)
{
s++;
continue;
}
acs = color & 0x80;
color = (color & 0x7F) - bce;
color += Bce_Color_Offset;
if (color >= 0)
{
unsigned char ch = SLSMG_EXTRACT_CHAR(*s);
*s = SLSMG_BUILD_CHAR(ch, ((color&0x7F)|acs));
}
s++;
}
}
}
#endif
void SLsmg_refresh (void)
{
int i;
#ifndef IBMPC_SYSTEM
int trashed = 0;
#endif
if (Smg_Inited == 0) return;
if (Screen_Trashed)
{
Cls_Flag = 1;
for (i = 0; i < Screen_Rows; i++)
SL_Screen[i].flags |= TRASHED;
#ifdef REQUIRES_NON_BCE_SUPPORT
adjust_colors ();
#endif
}
#ifndef IBMPC_SYSTEM
for (i = 0; i < Screen_Rows; i++)
{
if (SL_Screen[i].flags == 0) continue;
SL_Screen[i].new_hash = compute_hash (SL_Screen[i].neew, Screen_Cols);
trashed = 1;
}
#endif
if (Cls_Flag)
{
(*tt_normal_video) (); (*tt_cls) ();
}
#ifndef IBMPC_SYSTEM
else if (trashed && (*tt_Term_Cannot_Scroll == 0)) try_scroll ();
#endif
for (i = 0; i < Screen_Rows; i++)
{
if (SL_Screen[i].flags == 0) continue;
if (Cls_Flag || SL_Screen[i].flags & TRASHED)
{
int color = This_Color;
if (Cls_Flag == 0)
{
(*tt_goto_rc) (i, 0);
(*tt_del_eol) ();
}
This_Color = 0;
blank_line (SL_Screen[i].old, Screen_Cols, ' ');
This_Color = color;
}
SL_Screen[i].old[Screen_Cols] = 0;
SL_Screen[i].neew[Screen_Cols] = 0;
(*tt_smart_puts) (SL_Screen[i].neew, SL_Screen[i].old, Screen_Cols, i);
SLMEMCPY ((char *) SL_Screen[i].old, (char *) SL_Screen[i].neew,
Screen_Cols * sizeof (SLsmg_Char_Type));
SL_Screen[i].flags = 0;
#ifndef IBMPC_SYSTEM
SL_Screen[i].old_hash = SL_Screen[i].new_hash;
#endif
}
if (point_visible (1)) (*tt_goto_rc) (This_Row - Start_Row, This_Col - Start_Col);
(*tt_flush_output) ();
Cls_Flag = 0;
Screen_Trashed = 0;
}
static int compute_clip (int row, int n, int box_start, int box_end,
int *rmin, int *rmax)
{
int row_max;
if (n < 0) return 0;
if (row >= box_end) return 0;
row_max = row + n;
if (row_max <= box_start) return 0;
if (row < box_start) row = box_start;
if (row_max >= box_end) row_max = box_end;
*rmin = row;
*rmax = row_max;
return 1;
}
void SLsmg_touch_lines (int row, unsigned int n)
{
int i;
int r1, r2;
/* Allow this function to be called even when we are not initialied.
* Calling this function is useful after calling SLtt_set_color
* to force the display to be redrawn
*/
if (Smg_Inited == 0)
return;
if (0 == compute_clip (row, (int) n, Start_Row, Start_Row + Screen_Rows, &r1, &r2))
return;
r1 -= Start_Row;
r2 -= Start_Row;
for (i = r1; i < r2; i++)
{
SL_Screen[i].flags |= TRASHED;
}
}
void SLsmg_touch_screen (void)
{
Screen_Trashed = 1;
}
#ifndef IBMPC_SYSTEM
static char Fake_Alt_Char_Pairs [] = "a:j+k+l+m+q-t+u+v+w+x|n+`+f\\g#~o,<+>.v-^h#0#";
static void init_alt_char_set (void)
{
int i;
unsigned char *p, *pmax, ch;
if (Alt_Char_Set[128] == 128) return;
i = 32;
memset ((char *)Alt_Char_Set, ' ', i);
while (i <= 128)
{
Alt_Char_Set [i] = i;
i++;
}
/* Map to VT100 */
if (*tt_Has_Alt_Charset)
{
if (tt_Graphics_Char_Pairs == NULL) p = NULL;
else p = (unsigned char *) *tt_Graphics_Char_Pairs;
if (p == NULL) return;
}
else p = (unsigned char *) Fake_Alt_Char_Pairs;
pmax = p + strlen ((char *) p);
/* Some systems have messed up entries for this */
while (p < pmax)
{
ch = *p++;
ch &= 0x7F; /* should be unnecessary */
Alt_Char_Set [ch] = *p;
p++;
}
}
#endif
#ifndef IBMPC_SYSTEM
# define BLOCK_SIGNALS SLsig_block_signals ()
# define UNBLOCK_SIGNALS SLsig_unblock_signals ()
#else
# define BLOCK_SIGNALS (void)0
# define UNBLOCK_SIGNALS (void)0
#endif
static int Smg_Suspended;
int SLsmg_suspend_smg (void)
{
BLOCK_SIGNALS;
if (Smg_Suspended == 0)
{
(*tt_reset_video) ();
Smg_Suspended = 1;
}
UNBLOCK_SIGNALS;
return 0;
}
int SLsmg_resume_smg (void)
{
BLOCK_SIGNALS;
if (Smg_Suspended == 0)
{
UNBLOCK_SIGNALS;
return 0;
}
Smg_Suspended = 0;
if (-1 == (*tt_init_video) ())
{
UNBLOCK_SIGNALS;
return -1;
}
Cls_Flag = 1;
SLsmg_touch_screen ();
SLsmg_refresh ();
UNBLOCK_SIGNALS;
return 0;
}
static void reset_smg (void)
{
int i;
if (Smg_Inited == 0)
return;
for (i = 0; i < Screen_Rows; i++)
{
SLfree ((char *)SL_Screen[i].old);
SLfree ((char *)SL_Screen[i].neew);
SL_Screen[i].old = SL_Screen[i].neew = NULL;
}
This_Alt_Char = This_Color = 0;
Smg_Inited = 0;
}
static int init_smg (void)
{
int i, len;
SLsmg_Char_Type *old, *neew;
Smg_Inited = 0;
#ifdef REQUIRES_NON_BCE_SUPPORT
Bce_Color_Offset = _SLtt_get_bce_color_offset ();
#endif
Screen_Rows = *tt_Screen_Rows;
if (Screen_Rows > MAX_SCREEN_SIZE)
Screen_Rows = MAX_SCREEN_SIZE;
Screen_Cols = *tt_Screen_Cols;
This_Col = This_Row = Start_Col = Start_Row = 0;
This_Alt_Char = 0;
SLsmg_set_color (0);
Cls_Flag = 1;
#ifndef IBMPC_SYSTEM
init_alt_char_set ();
#endif
len = Screen_Cols + 3;
for (i = 0; i < Screen_Rows; i++)
{
if ((NULL == (old = (SLsmg_Char_Type *) SLmalloc (sizeof(SLsmg_Char_Type) * len)))
|| ((NULL == (neew = (SLsmg_Char_Type *) SLmalloc (sizeof(SLsmg_Char_Type) * len)))))
{
SLfree ((char *) old);
return -1;
}
blank_line (old, len, ' ');
blank_line (neew, len, ' ');
SL_Screen[i].old = old;
SL_Screen[i].neew = neew;
SL_Screen[i].flags = 0;
#ifndef IBMPC_SYSTEM
Blank_Hash = compute_hash (old, Screen_Cols);
SL_Screen[i].new_hash = SL_Screen[i].old_hash = Blank_Hash;
#endif
}
_SLtt_color_changed_hook = SLsmg_touch_screen;
Screen_Trashed = 1;
Smg_Inited = 1;
return 0;
}
int SLsmg_init_smg (void)
{
int ret;
BLOCK_SIGNALS;
if (Smg_Inited)
SLsmg_reset_smg ();
if (-1 == (*tt_init_video) ())
{
UNBLOCK_SIGNALS;
return -1;
}
if (-1 == (ret = init_smg ()))
(void) (*tt_reset_video)();
UNBLOCK_SIGNALS;
return ret;
}
int SLsmg_reinit_smg (void)
{
int ret;
if (Smg_Inited == 0)
return SLsmg_init_smg ();
BLOCK_SIGNALS;
reset_smg ();
ret = init_smg ();
UNBLOCK_SIGNALS;
return ret;
}
void SLsmg_reset_smg (void)
{
if (Smg_Inited == 0)
return;
BLOCK_SIGNALS;
reset_smg ();
(*tt_reset_video)();
UNBLOCK_SIGNALS;
}
SLsmg_Char_Type SLsmg_char_at (void)
{
if (Smg_Inited == 0) return 0;
if (point_visible (1))
{
return SL_Screen[This_Row - Start_Row].neew[This_Col - Start_Col];
}
return 0;
}
void SLsmg_vprintf (char *fmt, va_list ap)
{
char buf[1024];
if (Smg_Inited == 0) return;
(void) _SLvsnprintf (buf, sizeof (buf), fmt, ap);
SLsmg_write_string (buf);
}
void SLsmg_printf (char *fmt, ...)
{
va_list ap;
unsigned int len;
char *f;
if (Smg_Inited == 0) return;
va_start(ap, fmt);
f = fmt;
while (*f && (*f != '%'))
f++;
len = (unsigned int) (f - fmt);
if (len) SLsmg_write_nchars (fmt, len);
if (*f != 0)
SLsmg_vprintf (f, ap);
va_end (ap);
}
void SLsmg_set_screen_start (int *r, int *c)
{
int orow = Start_Row, oc = Start_Col;
if (Smg_Inited == 0) return;
if (c == NULL) Start_Col = 0;
else
{
Start_Col = *c;
*c = oc;
}
if (r == NULL) Start_Row = 0;
else
{
Start_Row = *r;
*r = orow;
}
}
void SLsmg_draw_object (int r, int c, unsigned char object)
{
This_Row = r; This_Col = c;
if (Smg_Inited == 0) return;
if (point_visible (1))
{
int color = This_Color;
This_Color |= ALT_CHAR_FLAG;
SLsmg_write_char (object);
This_Color = color;
}
This_Col = c + 1;
}
void SLsmg_draw_hline (unsigned int n)
{
static unsigned char hbuf[16];
int count;
int cmin, cmax;
int final_col = This_Col + (int) n;
int save_color;
if (Smg_Inited == 0) return;
if ((This_Row < Start_Row) || (This_Row >= Start_Row + Screen_Rows)
|| (0 == compute_clip (This_Col, n, Start_Col, Start_Col + Screen_Cols,
&cmin, &cmax)))
{
This_Col = final_col;
return;
}
if (hbuf[0] == 0)
{
SLMEMSET ((char *) hbuf, SLSMG_HLINE_CHAR, 16);
}
n = (unsigned int)(cmax - cmin);
count = n / 16;
save_color = This_Color;
This_Color |= ALT_CHAR_FLAG;
This_Col = cmin;
SLsmg_write_nchars ((char *) hbuf, n % 16);
while (count-- > 0)
{
SLsmg_write_nchars ((char *) hbuf, 16);
}
This_Color = save_color;
This_Col = final_col;
}
void SLsmg_draw_vline (int n)
{
unsigned char ch = SLSMG_VLINE_CHAR;
int c = This_Col, rmin, rmax;
int final_row = This_Row + n;
int save_color;
if (Smg_Inited == 0) return;
if (((c < Start_Col) || (c >= Start_Col + Screen_Cols)) ||
(0 == compute_clip (This_Row, n, Start_Row, Start_Row + Screen_Rows,
&rmin, &rmax)))
{
This_Row = final_row;
return;
}
save_color = This_Color;
This_Color |= ALT_CHAR_FLAG;
for (This_Row = rmin; This_Row < rmax; This_Row++)
{
This_Col = c;
SLsmg_write_nchars ((char *) &ch, 1);
}
This_Col = c; This_Row = final_row;
This_Color = save_color;
}
void SLsmg_draw_box (int r, int c, unsigned int dr, unsigned int dc)
{
if (Smg_Inited == 0) return;
if (!dr || !dc) return;
This_Row = r; This_Col = c;
dr--; dc--;
SLsmg_draw_hline (dc);
SLsmg_draw_vline (dr);
This_Row = r; This_Col = c;
SLsmg_draw_vline (dr);
SLsmg_draw_hline (dc);
SLsmg_draw_object (r, c, SLSMG_ULCORN_CHAR);
SLsmg_draw_object (r, c + (int) dc, SLSMG_URCORN_CHAR);
SLsmg_draw_object (r + (int) dr, c, SLSMG_LLCORN_CHAR);
SLsmg_draw_object (r + (int) dr, c + (int) dc, SLSMG_LRCORN_CHAR);
This_Row = r; This_Col = c;
}
void SLsmg_fill_region (int r, int c, unsigned int dr, unsigned int dc, unsigned char ch)
{
static unsigned char hbuf[16];
int count;
int dcmax, rmax;
if (Smg_Inited == 0) return;
SLsmg_gotorc (r, c);
r = This_Row; c = This_Col;
dcmax = Screen_Cols - This_Col;
if (dcmax < 0)
return;
if (dc > (unsigned int) dcmax) dc = (unsigned int) dcmax;
rmax = This_Row + dr;
if (rmax > Screen_Rows) rmax = Screen_Rows;
#if 0
ch = Alt_Char_Set[ch];
#endif
if (ch != hbuf[0]) SLMEMSET ((char *) hbuf, (char) ch, 16);
for (This_Row = r; This_Row < rmax; This_Row++)
{
This_Col = c;
count = dc / 16;
SLsmg_write_nchars ((char *) hbuf, dc % 16);
while (count-- > 0)
{
SLsmg_write_nchars ((char *) hbuf, 16);
}
}
This_Row = r;
}
void SLsmg_forward (int n)
{
This_Col += n;
}
void SLsmg_write_color_chars (SLsmg_Char_Type *s, unsigned int len)
{
SLsmg_Char_Type *smax, sh;
char buf[32], *b, *bmax;
int color, save_color;
if (Smg_Inited == 0) return;
smax = s + len;
b = buf;
bmax = b + sizeof (buf);
save_color = This_Color;
while (s < smax)
{
sh = *s++;
color = SLSMG_EXTRACT_COLOR(sh);
#if REQUIRES_NON_BCE_SUPPORT
if (Bce_Color_Offset)
{
if (color & 0x80)
color = ((color & 0x7F) + Bce_Color_Offset) | 0x80;
else
color = ((color & 0x7F) + Bce_Color_Offset) & 0x7F;
}
#endif
if ((color != This_Color) || (b == bmax))
{
if (b != buf)
{
SLsmg_write_nchars (buf, (int) (b - buf));
b = buf;
}
This_Color = color;
}
*b++ = (char) SLSMG_EXTRACT_CHAR(sh);
}
if (b != buf)
SLsmg_write_nchars (buf, (unsigned int) (b - buf));
This_Color = save_color;
}
unsigned int SLsmg_read_raw (SLsmg_Char_Type *buf, unsigned int len)
{
unsigned int r, c;
if (Smg_Inited == 0) return 0;
if (0 == point_visible (1)) return 0;
r = (unsigned int) (This_Row - Start_Row);
c = (unsigned int) (This_Col - Start_Col);
if (c + len > (unsigned int) Screen_Cols)
len = (unsigned int) Screen_Cols - c;
memcpy ((char *) buf, (char *) (SL_Screen[r].neew + c), len * sizeof (SLsmg_Char_Type));
return len;
}
unsigned int SLsmg_write_raw (SLsmg_Char_Type *buf, unsigned int len)
{
unsigned int r, c;
SLsmg_Char_Type *dest;
if (Smg_Inited == 0) return 0;
if (0 == point_visible (1)) return 0;
r = (unsigned int) (This_Row - Start_Row);
c = (unsigned int) (This_Col - Start_Col);
if (c + len > (unsigned int) Screen_Cols)
len = (unsigned int) Screen_Cols - c;
dest = SL_Screen[r].neew + c;
if (0 != memcmp ((char *) dest, (char *) buf, len * sizeof (SLsmg_Char_Type)))
{
memcpy ((char *) dest, (char *) buf, len * sizeof (SLsmg_Char_Type));
SL_Screen[r].flags |= TOUCHED;
}
return len;
}
void
SLsmg_set_color_in_region (int color, int r, int c, unsigned int dr, unsigned int dc)
{
int cmax, rmax;
SLsmg_Char_Type char_mask;
if (Smg_Inited == 0) return;
c -= Start_Col;
r -= Start_Row;
cmax = c + (int) dc;
rmax = r + (int) dr;
if (cmax > Screen_Cols) cmax = Screen_Cols;
if (rmax > Screen_Rows) rmax = Screen_Rows;
if (c < 0) c = 0;
if (r < 0) r = 0;
#if REQUIRES_NON_BCE_SUPPORT
if (Bce_Color_Offset)
{
if (color & 0x80)
color = ((color & 0x7F) + Bce_Color_Offset) | 0x80;
else
color = ((color & 0x7F) + Bce_Color_Offset) & 0x7F;
}
#endif
color = color << 8;
char_mask = 0xFF;
#ifndef IBMPC_SYSTEM
if ((tt_Use_Blink_For_ACS == NULL)
|| (0 == *tt_Use_Blink_For_ACS))
char_mask = 0x80FF;
#endif
while (r < rmax)
{
SLsmg_Char_Type *s, *smax;
SL_Screen[r].flags |= TOUCHED;
s = SL_Screen[r].neew;
smax = s + cmax;
s += c;
while (s < smax)
{
*s = (*s & char_mask) | color;
s++;
}
r++;
}
}
void SLsmg_set_terminal_info (SLsmg_Term_Type *tt)
{
if (tt == NULL) /* use default */
return;
if ((tt->tt_normal_video == NULL)
|| (tt->tt_goto_rc == NULL)
|| (tt->tt_cls == NULL)
|| (tt->tt_del_eol == NULL)
|| (tt->tt_smart_puts == NULL)
|| (tt->tt_flush_output == NULL)
|| (tt->tt_reset_video == NULL)
|| (tt->tt_init_video == NULL)
#ifndef IBMPC_SYSTEM
|| (tt->tt_set_scroll_region == NULL)
|| (tt->tt_reverse_index == NULL)
|| (tt->tt_reset_scroll_region == NULL)
|| (tt->tt_delete_nlines == NULL)
/* Variables */
|| (tt->tt_term_cannot_scroll == NULL)
|| (tt->tt_has_alt_charset == NULL)
#if 0 /* These can be NULL */
|| (tt->tt_use_blink_for_acs == NULL)
|| (tt->tt_graphic_char_pairs == NULL)
#endif
|| (tt->tt_screen_cols == NULL)
|| (tt->tt_screen_rows == NULL)
#endif
)
SLang_exit_error ("Terminal not powerful enough for SLsmg");
tt_normal_video = tt->tt_normal_video;
tt_goto_rc = tt->tt_goto_rc;
tt_cls = tt->tt_cls;
tt_del_eol = tt->tt_del_eol;
tt_smart_puts = tt->tt_smart_puts;
tt_flush_output = tt->tt_flush_output;
tt_reset_video = tt->tt_reset_video;
tt_init_video = tt->tt_init_video;
#ifndef IBMPC_SYSTEM
tt_set_scroll_region = tt->tt_set_scroll_region;
tt_reverse_index = tt->tt_reverse_index;
tt_reset_scroll_region = tt->tt_reset_scroll_region;
tt_delete_nlines = tt->tt_delete_nlines;
tt_Term_Cannot_Scroll = tt->tt_term_cannot_scroll;
tt_Has_Alt_Charset = tt->tt_has_alt_charset;
tt_Use_Blink_For_ACS = tt->tt_use_blink_for_acs;
tt_Graphics_Char_Pairs = tt->tt_graphic_char_pairs;
#endif
tt_Screen_Cols = tt->tt_screen_cols;
tt_Screen_Rows = tt->tt_screen_rows;
}