Annotation of OpenXM_contrib/gnuplot/term/linux.trm, Revision 1.1
1.1 ! maekawa 1: /*
! 2: * $Id: linux.trm,v 1.21 1998/06/18 14:59:20 ddenholm Exp $
! 3: *
! 4: */
! 5:
! 6: /* GNUPLOT - linux.trm */
! 7:
! 8: /*[
! 9: * Copyright 1993, 1998
! 10: *
! 11: * Permission to use, copy, and distribute this software and its
! 12: * documentation for any purpose with or without fee is hereby granted,
! 13: * provided that the above copyright notice appear in all copies and
! 14: * that both that copyright notice and this permission notice appear
! 15: * in supporting documentation.
! 16: *
! 17: * Permission to modify the software is granted, but not the right to
! 18: * distribute the complete modified source code. Modifications are to
! 19: * be distributed as patches to the released version. Permission to
! 20: * distribute binaries produced by compiling modified sources is granted,
! 21: * provided you
! 22: * 1. distribute the corresponding source modifications from the
! 23: * released version in the form of a patch file along with the binaries,
! 24: * 2. add special version identification to distinguish your version
! 25: * in addition to the base release version number,
! 26: * 3. provide your name and address as the primary contact for the
! 27: * support of your modified version, and
! 28: * 4. retain our contact information in regard to use of the base
! 29: * software.
! 30: * Permission to distribute the released version of the source code along
! 31: * with corresponding source modifications in the form of a patch file is
! 32: * granted with same provisions 2 through 4 for binary distributions.
! 33: *
! 34: * This software is provided "as is" without express or implied warranty
! 35: * to the extent permitted by applicable law.
! 36: ]*/
! 37:
! 38: /*
! 39: * This file is included by ../term.c.
! 40: *
! 41: * This terminal driver supports:
! 42: * SVGA up to 1024x768x256 for PC's running the Linux Operating System
! 43: * (also VGA 640x480x16, and SVGA 800x600x256)
! 44: *
! 45: * AUTHOR
! 46: * Scott Heavner (sdh@po.cwru.edu)
! 47: * based on original linux.trm by Tommy Frandsen (frandsen@diku.dk)
! 48: * patched by David J. Liu (liu@molecule.phri.nyu.edu)
! 49: * to increase perfomance and safety based on the features of SVGALib/GL.
! 50: * send your comments or suggestions to (pixar!info-gnuplot@sun.com).
! 51: */
! 52:
! 53: /*
! 54: * Compile with Linux SVGAlib 0.95 currently maintained by
! 55: * Harm Hanemaayer (hhanemaa@cs.ruu.nl).
! 56: * supports Trident, Tseng, Cirrus, Oak and generic vga.
! 57: */
! 58:
! 59: #include "driver.h"
! 60:
! 61: #ifdef TERM_REGISTER
! 62: register_term(linux)
! 63: #endif
! 64:
! 65: #ifdef TERM_PROTO
! 66:
! 67: #define LINUX_VCHAR FNT5X9_VCHAR
! 68: #define LINUX_HCHAR FNT5X9_HCHAR
! 69: #define LINUX_VTIC 5
! 70: #define LINUX_HTIC 5
! 71: #define LINUX_XMAX 0 /* These two entries are just place holders. */
! 72: #define LINUX_YMAX 0 /* The actual values will be filled in init. */
! 73:
! 74: TERM_PUBLIC void LINUX_options __PROTO((void));
! 75: TERM_PUBLIC void LINUX_init __PROTO((void));
! 76: TERM_PUBLIC void LINUX_reset __PROTO((void));
! 77: TERM_PUBLIC void LINUX_text __PROTO((void));
! 78: TERM_PUBLIC void LINUX_graphics __PROTO((void));
! 79: TERM_PUBLIC void LINUX_linetype __PROTO((int linetype));
! 80: TERM_PUBLIC void LINUX_move __PROTO((unsigned int x, unsigned int y));
! 81: TERM_PUBLIC void LINUX_vector __PROTO((unsigned int x, unsigned int y));
! 82: TERM_PUBLIC int LINUX_text_angle __PROTO((int ang));
! 83: TERM_PUBLIC void LINUX_put_text __PROTO((unsigned int x, unsigned int y, char *str));
! 84: TERM_PUBLIC void LINUX_suspend __PROTO((void));
! 85: TERM_PUBLIC void LINUX_resume __PROTO((void));
! 86:
! 87: #endif
! 88:
! 89: #ifdef TERM_BODY
! 90:
! 91: #define _STRING_H_
! 92: #include <vga.h>
! 93:
! 94: static int linux_vmode = G1024x768x256; /* default mode */
! 95: static int vgacolor[] = { 7, 8, 2, 3, 4, 5, 9, 14, 12, 15, 13, 10, 11, 1, 6 };
! 96: static int graphics_on = FALSE;
! 97: vga_modeinfo *modeinfo;
! 98: static int linux_startx, linux_starty, linux_lasty;
! 99: static int linux_angle;
! 100: int LINUX_graphics_allowed;
! 101:
! 102: typedef (*linux_line_func_ptr) __PROTO((int x1, int y1, int x2, int y2));
! 103:
! 104: static void LINUX_putc __PROTO((unsigned int x, unsigned int y, int c, int ang,
! 105: linux_line_func_ptr line_func));
! 106:
! 107: /* this function is called at the very beginning of main() to initialize
! 108: * the vgalib and to revoke suid privileges.
! 109: * /dev/console and /dev/tty\d are considered graphic terminals, all other
! 110: * don't support the linux terminal */
! 111:
! 112: void LINUX_setup(void)
! 113: {
! 114: char line[256];
! 115: FILE *pipe;
! 116:
! 117: LINUX_graphics_allowed = FALSE;
! 118:
! 119: if (geteuid() != 0)
! 120: return; /* if we aren't root, we cannot init graphics */
! 121:
! 122: if ((pipe = popen("/usr/bin/tty", "r")) != NULL) {
! 123: line[0] = 0;
! 124: fgets(line, 256, pipe);
! 125: pclose(pipe);
! 126: line[strlen(line) - 1] = '\0';
! 127: if (strcmp(line, "/dev/console") == 0 ||
! 128: (strncmp(line, "/dev/tty", 8) == 0 && isdigit(line[8])))
! 129: LINUX_graphics_allowed = TRUE;
! 130: }
! 131: if (LINUX_graphics_allowed) {
! 132: vga_init();
! 133: } else {
! 134: /* err - shouldn't we give up root uid whatever happens ?
! 135: * or perhaps vga_init() does it ?
! 136: */
! 137: setuid(getuid());
! 138: }
! 139: }
! 140:
! 141: TERM_PUBLIC void LINUX_options()
! 142: {
! 143: if (!LINUX_graphics_allowed) {
! 144: int_error("Linux terminal driver not available", NO_CARET);
! 145: }
! 146: fprintf(stderr, "%s\n", vga_getmodename(linux_vmode));
! 147: }
! 148:
! 149: TERM_PUBLIC void LINUX_init()
! 150: {
! 151: /* vga_init () has been moved to immediately after main () for security */
! 152: if (vga_getdefaultmode() != -1)
! 153: linux_vmode = vga_getdefaultmode();
! 154: /* get the default mode from GSVGAMODE, if available */
! 155: if (!vga_hasmode(linux_vmode))
! 156: linux_vmode = G640x480x16;
! 157: /* test default mode first */
! 158: if (!vga_hasmode(linux_vmode)) {
! 159: fputs("Error, unable to initiate graphics.\n", stderr);
! 160: return;
! 161: } /* this mode is the bottom line */
! 162: modeinfo = vga_getmodeinfo(linux_vmode);
! 163: term->xmax = modeinfo->width;
! 164: term->ymax = modeinfo->height;
! 165: linux_lasty = modeinfo->height - 1;
! 166: }
! 167:
! 168: TERM_PUBLIC void LINUX_reset()
! 169: {
! 170: if (graphics_on) {
! 171: vga_setmode(TEXT);
! 172: graphics_on = FALSE;
! 173: }
! 174: }
! 175:
! 176: TERM_PUBLIC void LINUX_text()
! 177: {
! 178: if (graphics_on) {
! 179: vga_getch();
! 180: vga_setmode(TEXT);
! 181: graphics_on = FALSE;
! 182: }
! 183: }
! 184:
! 185: TERM_PUBLIC void LINUX_graphics()
! 186: {
! 187: if (!graphics_on) {
! 188: vga_setmode(linux_vmode);
! 189: graphics_on = TRUE;
! 190: }
! 191: }
! 192:
! 193: TERM_PUBLIC void LINUX_suspend()
! 194: {
! 195: vga_flip();
! 196: }
! 197:
! 198: TERM_PUBLIC void LINUX_resume()
! 199: {
! 200: vga_flip();
! 201: }
! 202:
! 203: TERM_PUBLIC void LINUX_linetype(linetype)
! 204: int linetype;
! 205: {
! 206: if (linetype >= 13)
! 207: linetype %= 13;
! 208: vga_setcolor(vgacolor[linetype + 2]);
! 209: }
! 210:
! 211: TERM_PUBLIC void LINUX_move(x, y)
! 212: unsigned int x;
! 213: unsigned int y;
! 214: {
! 215: linux_startx = x;
! 216: linux_starty = y;
! 217: }
! 218:
! 219: TERM_PUBLIC void LINUX_vector(x, y)
! 220: unsigned int x;
! 221: unsigned int y;
! 222: {
! 223: vga_drawline(linux_startx, linux_lasty - linux_starty, x, linux_lasty - y);
! 224: linux_startx = x;
! 225: linux_starty = y;
! 226: }
! 227:
! 228: TERM_PUBLIC int LINUX_text_angle(ang)
! 229: int ang;
! 230: {
! 231: linux_angle = ang;
! 232: return TRUE;
! 233: }
! 234:
! 235: static void LINUX_putc(x, y, c, ang, line_func)
! 236: unsigned int x, y;
! 237: int c;
! 238: int ang;
! 239: linux_line_func_ptr line_func;
! 240: {
! 241: int i, j, k;
! 242: unsigned int pixelon;
! 243: i = (int) (c) - 32;
! 244: for (j = 0; j < FNT5X9_VBITS; j++) {
! 245: for (k = 0; k < FNT5X9_HBITS; k++) {
! 246: pixelon = (((unsigned int) (fnt5x9[i][j])) >> k & 1);
! 247: if (pixelon) {
! 248: switch (ang) {
! 249: case 0:
! 250: (*line_func) (x + k + 1, y - j, x + k + 1, y - j);
! 251: break;
! 252: case 1:
! 253: (*line_func) (x - j, y - k - 1, x - j, y - k - 1);
! 254: break;
! 255: }
! 256: }
! 257: }
! 258: }
! 259: }
! 260:
! 261: TERM_PUBLIC void LINUX_put_text(x, y, str)
! 262: unsigned int x, y;
! 263: char *str;
! 264: {
! 265: int i;
! 266: switch (linux_angle) {
! 267: case 0:
! 268: y -= LINUX_VCHAR / 2;
! 269: break;
! 270: case 1:
! 271: x += LINUX_VCHAR / 2;
! 272: break;
! 273: }
! 274: for (i = 0; str[i]; i++) {
! 275: LINUX_putc(x, linux_lasty - y, str[i], linux_angle, vga_drawline);
! 276: switch (linux_angle) {
! 277: case 0:
! 278: x += LINUX_HCHAR;
! 279: break;
! 280: case 1:
! 281: y += LINUX_HCHAR;
! 282: break;
! 283: }
! 284: }
! 285: }
! 286:
! 287: #endif
! 288:
! 289: #ifdef TERM_TABLE
! 290: TERM_TABLE_START(linux_driver)
! 291: "linux", "Linux PC with (s)vgalib",
! 292: LINUX_XMAX, LINUX_YMAX, LINUX_VCHAR, LINUX_HCHAR,
! 293: LINUX_VTIC, LINUX_HTIC, LINUX_options, LINUX_init, LINUX_reset,
! 294: LINUX_text, null_scale, LINUX_graphics, LINUX_move, LINUX_vector,
! 295: LINUX_linetype, LINUX_put_text, LINUX_text_angle,
! 296: null_justify_text, do_point, do_arrow, set_font_null,
! 297: 0, /* pointsize */
! 298: TERM_CAN_MULTIPLOT, LINUX_suspend, LINUX_resume
! 299: TERM_TABLE_END(linux_driver)
! 300: #undef LAST_TERM
! 301: #define LAST_TERM linux_driver
! 302: #endif
! 303:
! 304: #ifdef TERM_HELP
! 305: START_HELP(linux)
! 306: "1 linux",
! 307: "?commands set terminal linux",
! 308: "?set terminal linux",
! 309: "?set term linux",
! 310: "?terminal linux",
! 311: "?term linux",
! 312: "?linux",
! 313: " The `linux` driver has no additional options to specify. It looks at the",
! 314: " environment variable GSVGAMODE for the default mode; if not set, it uses",
! 315: " 1024x768x256 as default mode or, if that is not possible, 640x480x16",
! 316: " (standard VGA)."
! 317: END_HELP(linux)
! 318: #endif
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