schistory.c revision 54387
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: head/sys/dev/syscons/schistory.c 54387 1999-12-10 09:36:05Z yokota $ 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 */ 64static int extra_history_size 65 = SC_MAX_HISTORY_SIZE - SC_HISTORY_SIZE*MAXCONS; 66 67/* local functions */ 68static void copy_history(sc_vtb_t *from, sc_vtb_t *to); 69static void history_to_screen(scr_stat *scp); 70 71/* allocate a history buffer */ 72int 73sc_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 free(prev_history, M_DEVBUF); 139 } 140 141 scp->history = history; 142 143 return 0; 144} 145 146static void 147copy_history(sc_vtb_t *from, sc_vtb_t *to) 148{ 149 int lines; 150 int cols; 151 int cols1; 152 int cols2; 153 int pos; 154 int i; 155 156 lines = sc_vtb_rows(from); 157 cols1 = sc_vtb_cols(from); 158 cols2 = sc_vtb_cols(to); 159 cols = imin(cols1, cols2); 160 pos = sc_vtb_tail(from); 161 for (i = 0; i < lines; ++i) { 162 sc_vtb_append(from, pos, to, cols); 163 if (cols < cols2) 164 sc_vtb_seek(to, sc_vtb_pos(to, 165 sc_vtb_tail(to), 166 cols2 - cols)); 167 pos = sc_vtb_pos(from, pos, cols1); 168 } 169} 170 171void 172sc_free_history_buffer(scr_stat *scp, int prev_ysize) 173{ 174 sc_vtb_t *history; 175 int cur_lines; /* current buffer size */ 176 int min_lines; /* guaranteed buffer size */ 177 178 history = scp->history; 179 scp->history = NULL; 180 if (history == NULL) 181 return; 182 183 cur_lines = sc_vtb_rows(history); 184 min_lines = imax(SC_HISTORY_SIZE, prev_ysize); 185 extra_history_size += (cur_lines > min_lines) ? cur_lines - min_lines : 0; 186 187 sc_vtb_destroy(history); 188 free(history, M_DEVBUF); 189} 190 191/* copy entire screen into the top of the history buffer */ 192void 193sc_hist_save(scr_stat *scp) 194{ 195 sc_vtb_append(&scp->vtb, 0, scp->history, scp->xsize*scp->ysize); 196 scp->history_pos = sc_vtb_tail(scp->history); 197} 198 199/* restore the screen by copying from the history buffer */ 200int 201sc_hist_restore(scr_stat *scp) 202{ 203 int ret; 204 205 if (scp->history_pos != sc_vtb_tail(scp->history)) { 206 scp->history_pos = sc_vtb_tail(scp->history); 207 history_to_screen(scp); 208 ret = 0; 209 } else { 210 ret = 1; 211 } 212 sc_vtb_seek(scp->history, sc_vtb_pos(scp->history, 213 sc_vtb_tail(scp->history), 214 -scp->xsize*scp->ysize)); 215 return ret; 216} 217 218/* copy screen-full of saved lines */ 219static void 220history_to_screen(scr_stat *scp) 221{ 222 int pos; 223 int i; 224 225 pos = scp->history_pos; 226 for (i = 1; i <= scp->ysize; ++i) { 227 pos = sc_vtb_pos(scp->history, pos, -scp->xsize); 228 sc_vtb_copy(scp->history, pos, 229 &scp->vtb, scp->xsize*(scp->ysize - i), 230 scp->xsize); 231 } 232 mark_all(scp); 233} 234 235/* go to the tail of the history buffer */ 236void 237sc_hist_home(scr_stat *scp) 238{ 239 scp->history_pos = sc_vtb_tail(scp->history); 240 history_to_screen(scp); 241} 242 243/* go to the top of the history buffer */ 244void 245sc_hist_end(scr_stat *scp) 246{ 247 scp->history_pos = sc_vtb_pos(scp->history, sc_vtb_tail(scp->history), 248 scp->xsize*scp->ysize); 249 history_to_screen(scp); 250} 251 252/* move one line up */ 253int 254sc_hist_up_line(scr_stat *scp) 255{ 256 if (sc_vtb_pos(scp->history, scp->history_pos, -(scp->xsize*scp->ysize)) 257 == sc_vtb_tail(scp->history)) 258 return -1; 259 scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos, 260 -scp->xsize); 261 history_to_screen(scp); 262 return 0; 263} 264 265/* move one line down */ 266int 267sc_hist_down_line(scr_stat *scp) 268{ 269 if (scp->history_pos == sc_vtb_tail(scp->history)) 270 return -1; 271 scp->history_pos = sc_vtb_pos(scp->history, scp->history_pos, 272 scp->xsize); 273 history_to_screen(scp); 274 return 0; 275} 276 277int 278sc_hist_ioctl(struct tty *tp, u_long cmd, caddr_t data, int flag, 279 struct proc *p) 280{ 281 scr_stat *scp; 282 int error; 283 284 switch (cmd) { 285 286 case CONS_HISTORY: /* set history size */ 287 scp = SC_STAT(tp->t_dev); 288 if (*(int *)data <= 0) 289 return EINVAL; 290 if (scp->status & BUFFER_SAVED) 291 return EBUSY; 292 DPRINTF(5, ("lines:%d, ysize:%d, pool:%d\n", 293 *(int *)data, scp->ysize, extra_history_size)); 294 error = sc_alloc_history_buffer(scp, 295 imax(*(int *)data, scp->ysize), 296 scp->ysize, TRUE); 297 DPRINTF(5, ("error:%d, rows:%d, pool:%d\n", error, 298 sc_vtb_rows(scp->history), extra_history_size)); 299 return error; 300 } 301 302 return ENOIOCTL; 303} 304 305#endif /* SC_NO_HISTORY */ 306 307#endif /* NSC */ 308