payloads/libpayload/curses/pdcurses-backend/pdcscrn.c

   1 /* Public Domain Curses */
   2
   3 #include "lppdc.h"
   4
   5 #include <stdlib.h>
   6
   7 #ifdef CHTYPE_LONG
   8 # define PDC_OFFSET 32
   9 #else
  10 # define PDC_OFFSET  8
  11 #endif
  12
  13 /* COLOR_PAIR to attribute encoding table. */
  14
  15 unsigned char *pdc_atrtab = (unsigned char *)NULL;
  16
  17 short curstoreal[16], realtocurs[16] =
  18 {
  19     COLOR_BLACK, COLOR_BLUE, COLOR_GREEN, COLOR_CYAN, COLOR_RED,
  20     COLOR_MAGENTA, COLOR_YELLOW, COLOR_WHITE, COLOR_BLACK + 8,
  21     COLOR_BLUE + 8, COLOR_GREEN + 8, COLOR_CYAN + 8, COLOR_RED + 8,
  22     COLOR_MAGENTA + 8, COLOR_YELLOW + 8, COLOR_WHITE + 8
  23 };
  24
  25 /* close the physical screen -- may restore the screen to its state
  26    before PDC_scr_open(); miscellaneous cleanup */
  27
  28 void PDC_scr_close(void)
  29 {
  30     PDC_LOG(("PDC_scr_close() - called\n"));
  31
  32     reset_shell_mode();
  33
  34     if (SP->visibility != 1)
  35         curs_set(1);
  36
  37     /* Position cursor to the bottom left of the screen. */
  38
  39     PDC_gotoyx(PDC_get_rows() - 2, 0);
  40 }
  41
  42 void PDC_scr_free(void)
  43 {
  44     if (SP)
  45         free(SP);
  46     if (pdc_atrtab)
  47         free(pdc_atrtab);
  48
  49     pdc_atrtab = (unsigned char *)NULL;
  50 }
  51
  52 /* open the physical screen -- allocate SP, miscellaneous intialization,
  53    and may save the existing screen for later restoration */
  54
  55 int PDC_scr_open(int argc, char **argv)
  56 {
  57     int i;
  58
  59     PDC_LOG(("PDC_scr_open() - called\n"));
  60
  61     SP = calloc(1, sizeof(SCREEN));
  62     pdc_atrtab = calloc(PDC_COLOR_PAIRS * PDC_OFFSET, 1);
  63
  64     if (!SP || !pdc_atrtab)
  65         return ERR;
  66
  67     for (i = 0; i < 16; i++)
  68         curstoreal[realtocurs[i]] = i;
  69
  70     SP->orig_attr = FALSE;
  71
  72     SP->lines = PDC_get_rows();
  73     SP->cols = PDC_get_columns();
  74
  75 #if CONFIG(LP_SPEAKER)
  76     SP->audible = TRUE;
  77 #endif
  78
  79     return OK;
  80 }
  81
  82 /* the core of resize_term() */
  83
  84 int PDC_resize_screen(int nlines, int ncols)
  85 {
  86     PDC_LOG(("PDC_resize_screen() - called. Lines: %d Cols: %d\n",
  87              nlines, ncols));
  88
  89     return ERR;
  90 }
  91
  92 void PDC_reset_prog_mode(void)
  93 {
  94         PDC_LOG(("PDC_reset_prog_mode() - called.\n"));
  95 }
  96
  97 void PDC_reset_shell_mode(void)
  98 {
  99         PDC_LOG(("PDC_reset_shell_mode() - called.\n"));
 100 }
 101
 102 void PDC_restore_screen_mode(int i)
 103 {
 104 }
 105
 106 void PDC_save_screen_mode(int i)
 107 {
 108 }
 109
 110 void PDC_init_pair(short pair, short fg, short bg)
 111 {
 112     unsigned char att, temp_bg;
 113     chtype i;
 114
 115     fg = curstoreal[fg];
 116     bg = curstoreal[bg];
 117
 118     for (i = 0; i < PDC_OFFSET; i++)
 119     {
 120         att = fg | (bg << 4);
 121
 122         if (i & (A_REVERSE >> PDC_ATTR_SHIFT))
 123             att = bg | (fg << 4);
 124         if (i & (A_UNDERLINE >> PDC_ATTR_SHIFT))
 125             att = 1;
 126         if (i & (A_INVIS >> PDC_ATTR_SHIFT))
 127         {
 128             temp_bg = att >> 4;
 129             att = temp_bg << 4 | temp_bg;
 130         }
 131         if (i & (A_BOLD >> PDC_ATTR_SHIFT))
 132             att |= 8;
 133         if (i & (A_BLINK >> PDC_ATTR_SHIFT))
 134             att |= 128;
 135
 136         pdc_atrtab[pair * PDC_OFFSET + i] = att;
 137     }
 138 }
 139
 140 int PDC_pair_content(short pair, short *fg, short *bg)
 141 {
 142     *fg = realtocurs[pdc_atrtab[pair * PDC_OFFSET] & 0x0F];
 143     *bg = realtocurs[(pdc_atrtab[pair * PDC_OFFSET] & 0xF0) >> 4];
 144
 145     return OK;
 146 }
 147
 148 bool PDC_can_change_color(void)
 149 {
 150     return FALSE;
 151 }
 152
 153 int PDC_color_content(short color, short *red, short *green, short *blue)
 154 {
 155     return ERR;
 156 }
 157
 158 int PDC_init_color(short color, short red, short green, short blue)
 159 {
 160     return ERR;
 161 }