1 /*- 2 * Copyright (c) 1999 Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> 3 * Copyright (c) 1992-1998 S�ren Schmidt 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer, 11 * without modification, immediately at the beginning of the file. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. The name of the author may not be used to endorse or promote products 16 * derived from this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 21 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT, 22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include "sc.h" 33 #include "opt_syscons.h" 34 35 #if NSC > 0 36 37 #ifndef SC_NO_HISTORY 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/conf.h> 42 #include <sys/tty.h> 43 #include <sys/kernel.h> 44 #include <sys/malloc.h> 45 46 #include <machine/console.h> 47 48 #include <dev/syscons/syscons.h> 49 50 #if !defined(SC_MAX_HISTORY_SIZE) 51 #define SC_MAX_HISTORY_SIZE (1000 * MAXCONS * NSC) 52 #endif 53 54 #if !defined(SC_HISTORY_SIZE) 55 #define SC_HISTORY_SIZE (ROW * 4) 56 #endif 57 58 #if (SC_HISTORY_SIZE * MAXCONS * NSC) > SC_MAX_HISTORY_SIZE 59 #undef SC_MAX_HISTORY_SIZE 60 #define SC_MAX_HISTORY_SIZE (SC_HISTORY_SIZE * MAXCONS * NSC) 61 #endif 62 63 /* local variables */ 64 static int extra_history_size 65 = SC_MAX_HISTORY_SIZE - SC_HISTORY_SIZE*MAXCONS; 66 67 /* local functions */ 68 static void copy_history(sc_vtb_t *from, sc_vtb_t *to); 69 static void history_to_screen(scr_stat *scp); 70 71 /* allocate a history buffer */ 72 int 73 sc_alloc_history_buffer(scr_stat *scp, int lines, int prev_ysize, int wait) 74 { 75 /* 76 * syscons unconditionally allocates buffers upto 77 * SC_HISTORY_SIZE lines or scp->ysize lines, whichever 78 * is larger. A value greater than that is allowed, 79 * subject to extra_history_size. 80 */ 81 sc_vtb_t *history; 82 sc_vtb_t *prev_history; 83 int cur_lines; /* current buffer size */ 84 int min_lines; /* guaranteed buffer size */ 85 int delta; /* lines to put back */ 86 87 if (lines <= 0) 88 lines = SC_HISTORY_SIZE; /* use the default value */ 89 90 /* make it at least as large as the screen size */ 91 lines = imax(lines, scp->ysize); 92 93 /* remove the history buffer while we update it */ 94 history = prev_history = scp->history; 95 scp->history = NULL; 96 97 /* calculate the amount of lines to put back to extra_history_size */ 98 delta = 0; 99 if (prev_history) { 100 cur_lines = sc_vtb_rows(history); 101 min_lines = imax(SC_HISTORY_SIZE, prev_ysize); 102 if (cur_lines > min_lines) 103 delta = cur_lines - min_lines; 104 } 105 106 /* lines upto min_lines are always allowed. */ 107 min_lines = imax(SC_HISTORY_SIZE, scp->ysize); 108 if (lines > min_lines) { 109 if (lines - min_lines > extra_history_size + delta) { 110 /* too many lines are requested */ 111 scp->history = prev_history; 112 return EINVAL; 113 } 114 } 115 116 /* allocate a new buffer */ 117 history = (sc_vtb_t *)malloc(sizeof(*history), 118 M_DEVBUF, 119 (wait) ? M_WAITOK : M_NOWAIT); 120 if (history != NULL) { 121 if (lines > min_lines) 122 extra_history_size -= lines - min_lines; 123 sc_vtb_init(history, VTB_RINGBUFFER, scp->xsize, lines, 124 NULL, wait); 125 sc_vtb_clear(history, scp->sc->scr_map[0x20], 126 scp->term.cur_color); 127 if (prev_history != NULL) 128 copy_history(prev_history, history); 129 scp->history_pos = sc_vtb_tail(history); 130 } else { 131 scp->history_pos = 0; 132 } 133 134 /* destroy the previous buffer */ 135 if (prev_history != NULL) { 136 extra_history_size += delta; 137 sc_vtb_destroy(prev_history); 138 } 139 140 scp->history = history; 141 142 return 0; 143 } 144 145 static void 146 copy_history(sc_vtb_t *from, sc_vtb_t *to) 147 { 148 int lines; 149 int cols; 150 int cols1; 151 int cols2; 152 int pos; 153 int i; 154 155 lines = sc_vtb_rows(from); 156 cols1 = sc_vtb_cols(from); 157 cols2 = sc_vtb_cols(to); 158 cols = imin(cols1, cols2); 159 pos = sc_vtb_tail(from); 160 for (i = 0; i < lines; ++i) { 161 sc_vtb_append(from, pos, to, cols); 162 if (cols < cols2) 163 sc_vtb_seek(to, sc_vtb_pos(to, 164 sc_vtb_tail(to), 165 cols2 - cols)); 166 pos = sc_vtb_pos(from, pos, cols1); 167 } 168 } 169 170 void 171 sc_free_history_buffer(scr_stat *scp, int prev_ysize) 172 { 173 sc_vtb_t *history; 174 int cur_lines; /* current buffer size */ 175 int min_lines; /* guaranteed buffer size */ 176 177 history = scp->history; 178 scp->history = NULL; 179 if (history == NULL) 180 return; 181 182 cur_lines = sc_vtb_rows(history); 183 min_lines = imax(SC_HISTORY_SIZE, prev_ysize); 184 extra_history_size += (cur_lines > min_lines) ? cur_lines - min_lines : 0; 185 186 sc_vtb_destroy(history); 187 free(history, M_DEVBUF); 188 } 189 190 /* copy entire screen into the top of the history buffer */ 191 void 192 sc_hist_save(scr_stat *scp) 193 { 194 sc_vtb_append(&scp->vtb, 0, scp->history, scp->xsize*scp->ysize); 195 scp->history_pos = sc_vtb_tail(scp->history); 196 } 197 198 /* restore the screen by copying from the history buffer */ 199 int 200 sc_hist_restore(scr_stat *scp) 201 { 202 int ret; 203 204 if (scp->history_pos != sc_vtb_tail(scp->history)) { 205 scp->history_pos = sc_vtb_tail(scp->history); 206 history_to_screen(scp); 207 ret = 0; 208 } else { 209 ret = 1; 210 } 211 sc_vtb_seek(scp->history, sc_vtb_pos(scp->history, 212 sc_vtb_tail(scp->history), 213 -scp->xsize*scp->ysize)); 214 return ret; 215 } 216 217 /* copy screen-full of saved lines */ 218 static void 219 history_to_screen(scr_stat *scp) 220 { 221 int pos; 222 int i; 223 224 pos = scp->history_pos; 225 for (i = 1; i <= scp->ysize; ++i) { 226 pos = sc_vtb_pos(scp->history, pos, -scp->xsize); 227 sc_vtb_copy(scp->history, pos, 228 &scp->vtb, scp->xsize*(scp->ysize - i), 229 scp->xsize); 230 } 231 mark_all(scp); 232 } 233 234 /* go to the tail of the history buffer */ 235 void 236 sc_hist_home(scr_stat *scp) 237 { 238 scp->history_pos = sc_vtb_tail(scp->history); 239 history_to_screen(scp); 240 } 241 242 /* go to the top of the history buffer */ 243 void 244 sc_hist_end(scr_stat *scp) 245 { 246 scp->history_pos = sc_vtb_pos(scp->history, sc_vtb_tail(scp->history), 247 scp->xsize*scp->ysize); 248 history_to_screen(scp); 249 } 250 251 /* move one line up */ 252 int 253 sc_hist_up_line(scr_stat *scp) 254 { 255 if (sc_vtb_pos(scp->history, scp->history_pos, -(scp->xsize*scp->ysize)) 256 == sc_vtb_tail(scp->history)) 257 return -1; 258 scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos, 259 -scp->xsize); 260 history_to_screen(scp); 261 return 0; 262 } 263 264 /* move one line down */ 265 int 266 sc_hist_down_line(scr_stat *scp) 267 { 268 if (scp->history_pos == sc_vtb_tail(scp->history)) 269 return -1; 270 scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos, 271 scp->xsize); 272 history_to_screen(scp); 273 return 0; 274 } 275 276 int 277 sc_hist_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, 278 struct proc *p) 279 { 280 scr_stat *scp; 281 int error; 282 283 switch (cmd) { 284 285 case CONS_HISTORY: /* set history size */ 286 scp = SC_STAT(tp->t_dev); 287 if (*(int *)data <= 0) 288 return EINVAL; 289 if (scp->status & BUFFER_SAVED) 290 return EBUSY; 291 DPRINTF(5, ("lines:%d, ysize:%d, pool:%d\n", 292 *(int *)data, scp->ysize, extra_history_size)); 293 error = sc_alloc_history_buffer(scp, 294 imax(*(int *)data, scp->ysize), 295 scp->ysize, TRUE); 296 DPRINTF(5, ("error:%d, rows:%d, pool:%d\n", error, 297 sc_vtb_rows(scp->history), extra_history_size)); 298 return error; 299 } 300 301 return ENOIOCTL; 302 } 303 304 #endif /* SC_NO_HISTORY */ 305 306 #endif /* NSC */ 307