term.c

   1 #include <ctype.h>
   2 #include <pty.h>
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include <sys/types.h>
   7 #include <unistd.h>
   8 #include "pad.h"
   9 #include "util.h"
  10 #include "term.h"
  11
  12 #define FGCOLOR         0
  13 #define BGCOLOR         7
  14 #define SQRADDR(r, c)           (&screen[(r) * pad_cols() + (c)])
  15
  16 #define MODE_NOCURSOR           0x01
  17 #define MODE_NOWRAP             0x02
  18 #define MODE_ORIGIN             0x04
  19 #define MODE_NOAUTOCR           0x08
  20 #define BIT_SET(i, b, val)      ((val) ? ((i) | (b)) : ((i) & ~(b)))
  21
  22 static pid_t pid;
  23 static int fd;
  24 static int row, col;
  25 static int fg, bg;
  26 static struct square screen[MAXCHARS];
  27 static int top, bot;
  28 static int mode;
  29 static struct miscterm_state saved;
  30
  31 static int origin(void)
  32 {
  33         return mode & MODE_ORIGIN;
  34 }
  35
  36 static void setsize(void)
  37 {
  38         struct winsize size;
  39         size.ws_col = pad_cols();
  40         size.ws_row = pad_rows();
  41         size.ws_xpixel = 0;
  42         size.ws_ypixel = 0;
  43         ioctl(fd, TIOCSWINSZ, &size);
  44 }
  45
  46 static int readpty(void)
  47 {
  48         char b;
  49         if (read(fd, &b, 1) > 0)
  50                 return (int) b;
  51         return -1;
  52 }
  53
  54 static void term_show(int r, int c, int cursor)
  55 {
  56         struct square *sqr = SQRADDR(r, c);
  57         int fgcolor = sqr->c ? sqr->fg : fg;
  58         int bgcolor = sqr->c ? sqr->bg : bg;
  59         if (cursor && !(mode & MODE_NOCURSOR)) {
  60                 int t = fgcolor;
  61                 fgcolor = bgcolor;
  62                 bgcolor = t;
  63         }
  64         pad_put(sqr->c, r, c, fgcolor, bgcolor);
  65 }
  66
  67 void term_put(int ch, int r, int c)
  68 {
  69         struct square *sqr = SQRADDR(r, c);
  70         sqr->c = ch;
  71         sqr->fg = fg;
  72         sqr->bg = bg;
  73         term_show(r, c, 0);
  74 }
  75
  76 static void empty_rows(int sr, int er)
  77 {
  78         memset(SQRADDR(sr, 0), 0, (er - sr) * sizeof(screen[0]) * pad_cols());
  79 }
  80
  81 static void draw_rows(int sr, int er)
  82 {
  83         int i = 0;
  84         for (i = sr * pad_cols(); i < er * pad_cols(); i++)
  85                 term_show(i / pad_cols(), i % pad_cols(), 0);
  86 }
  87
  88 static void blank_rows(int sr, int er)
  89 {
  90         empty_rows(sr, er);
  91         draw_rows(sr, er);
  92         term_show(row, col, 1);
  93 }
  94
  95 static void scroll_screen(int sr, int nr, int n)
  96 {
  97         term_show(row, col, 0);
  98         memmove(SQRADDR(sr + n, 0), SQRADDR(sr, 0),
  99                 nr * pad_cols() * sizeof(screen[0]));
 100         if (n > 0)
 101                 empty_rows(sr, sr + n);
 102         else
 103                 empty_rows(sr + nr + n, sr + nr);
 104         pad_scroll(sr, nr, n, bg);
 105         term_show(row, col, 1);
 106 }
 107
 108 static void insert_lines(int n)
 109 {
 110         int sr = MAX(top, row);
 111         int nr = bot - row - n;
 112         if (nr > 0)
 113                 scroll_screen(sr, nr, n);
 114 }
 115
 116 static void delete_lines(int n)
 117 {
 118         int r = MAX(top, row);
 119         int sr = r + n;
 120         int nr = bot - r - n;
 121         if (nr > 0)
 122                 scroll_screen(sr, nr, -n);
 123 }
 124
 125 static void move_cursor(int r, int c)
 126 {
 127         term_show(row, col, 0);
 128         row = MAX(origin() ? top : 0, MIN(r, (origin() ? bot : pad_rows()) - 1));
 129         col = MAX(0, MIN(c, pad_cols() - 1));
 130         term_show(row, col, 1);
 131 }
 132
 133 static void advance(int dr, int dc, int scrl)
 134 {
 135         int r = row + dr;
 136         int c = col + dc;
 137         int t = origin() ? top : 0;
 138         int b = origin() ? bot : pad_rows();
 139         if (c >= pad_cols()) {
 140                 if (!scrl || (mode & MODE_NOWRAP)) {
 141                         c = pad_cols() - 1;
 142                 } else {
 143                         r++;
 144                         c = 0;
 145                 }
 146         }
 147         if (r >= b && scrl) {
 148                 int n = b - r - 1;
 149                 int nr = (b - t) + n;
 150                 scroll_screen(-n, nr, n);
 151         }
 152         if (r < t && scrl) {
 153                 int n = t - r;
 154                 int nr = (b - t) - n;
 155                 scroll_screen(t, nr, n);
 156         }
 157         r = MIN(b - 1, MAX(t, r));
 158         move_cursor(r, MAX(0, c));
 159 }
 160
 161 void term_send(int c)
 162 {
 163         unsigned char b = (unsigned char) c;
 164         if (fd)
 165                 write(fd, &b, 1);
 166 }
 167
 168 void term_sendstr(char *s)
 169 {
 170         if (fd)
 171                 write(fd, s, strlen(s));
 172 }
 173
 174 static void setmode(int m)
 175 {
 176         if (m == 0) {
 177                 fg = FGCOLOR;
 178                 bg = BGCOLOR;
 179         }
 180         if (m == 1)
 181                 fg = fg | 0x08;
 182         if (m == 7) {
 183                 int t = fg;
 184                 fg = bg;
 185                 bg = t;
 186         }
 187         if (m >= 30 && m <= 37)
 188                 fg = m - 30;
 189         if (m >= 40 && m <= 47)
 190                 bg = m - 40;
 191 }
 192
 193 static void kill_chars(int sc, int ec)
 194 {
 195         int i;
 196         memset(SQRADDR(row, sc), 0, (ec - sc) * sizeof(screen[0]));
 197         for (i = sc; i < ec; i++)
 198                 term_show(row, i, 0);
 199         move_cursor(row, col);
 200 }
 201
 202 static void move_chars(int sc, int nc, int n)
 203 {
 204         int i;
 205         term_show(row, col, 0);
 206         memmove(SQRADDR(row, sc + n), SQRADDR(row, sc),
 207                 nc * sizeof(screen[0]));
 208         if (n > 0)
 209                 memset(SQRADDR(row, sc), 0, n * sizeof(screen[0]));
 210         else
 211                 memset(SQRADDR(row, pad_rows() + n), 0, -n * sizeof(screen[0]));
 212         for (i = MIN(sc, sc + n); i < pad_cols(); i++)
 213                 term_show(row, i, 0);
 214         term_show(row, col, 1);
 215 }
 216
 217 static void delete_chars(int n)
 218 {
 219         move_chars(col + n, pad_cols(), -n);
 220 }
 221
 222 static void insert_chars(int n)
 223 {
 224         int nc = pad_cols() - col - n;
 225         move_chars(col, nc, n);
 226 }
 227
 228 void term_blank(void)
 229 {
 230         pad_blank(bg);
 231         memset(screen, 0, sizeof(screen));
 232 }
 233
 234 static void ctlseq(void);
 235 void term_read(void)
 236 {
 237         ctlseq();
 238 }
 239
 240 void term_exec(char *cmd)
 241 {
 242         if ((pid = forkpty(&fd, NULL, NULL, NULL)) == -1)
 243                 xerror("failed to create a pty");
 244         if (!pid) {
 245                 setenv("TERM", "linux", 1);
 246                 execl(cmd, cmd, NULL);
 247                 exit(1);
 248         }
 249         setsize();
 250         setmode(0);
 251         term_blank();
 252 }
 253
 254 static void misc_save(struct miscterm_state *state)
 255 {
 256         state->row = row;
 257         state->col = col;
 258         state->fg = fg;
 259         state->bg = bg;
 260         state->top = top;
 261         state->bot = bot;
 262         state->mode = mode;
 263 }
 264
 265 static void misc_load(struct miscterm_state *state)
 266 {
 267         row = state->row;
 268         col = state->col;
 269         fg = state->fg;
 270         bg = state->bg;
 271         top = state->top;
 272         bot = state->bot;
 273         mode = state->mode;
 274 }
 275
 276 void term_save(struct term_state *state)
 277 {
 278         state->fd = fd;
 279         state->pid = pid;
 280         memcpy(state->screen, screen,
 281                 pad_rows() * pad_cols() * sizeof(screen[0]));
 282         state->sav = saved;
 283         misc_save(&state->cur);
 284 }
 285
 286 void term_load(struct term_state *state)
 287 {
 288         fd = state->fd;
 289         pid = state->pid;
 290         misc_load(&state->cur);
 291         saved = state->sav;
 292         memcpy(screen, state->screen,
 293                 pad_rows() * pad_cols() * sizeof(screen[0]));
 294         draw_rows(0, pad_rows());
 295         term_show(row, col, 1);
 296 }
 297
 298 int term_fd(void)
 299 {
 300         return fd;
 301 }
 302
 303 void term_init(void)
 304 {
 305         pad_init();
 306         bot = pad_rows();
 307         term_blank();
 308 }
 309
 310 void term_free(void)
 311 {
 312         pad_free();
 313 }
 314
 315 void term_end(void)
 316 {
 317         fd = 0;
 318         row = col = 0;
 319         fg = 0;
 320         bg = 0;
 321         term_blank();
 322 }
 323
 324 void set_region(int t, int b)
 325 {
 326         top = MIN(pad_rows(), MAX(0, t - 1));
 327         bot = MIN(pad_rows(), MAX(0, b ? b : pad_rows()));
 328         if (origin())
 329                 move_cursor(top, 0);
 330 }
 331
 332 #include "vt102.c"