Annotation of OpenXM_contrib/gnuplot/term/linux.trm, Revision 1.1.1.2
1.1 maekawa 1: /*
1.1.1.2 ! maekawa 2: * $Id: linux.trm,v 1.8.2.1 1999/08/19 14:17:16 lhecking Exp $
1.1 maekawa 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));
1.1.1.2 ! maekawa 83: TERM_PUBLIC void LINUX_put_text __PROTO((unsigned int x, unsigned int y, const char *str));
1.1 maekawa 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;
1.1.1.2 ! maekawa 101: extern void drop_privilege();
! 102: extern void take_privilege();
1.1 maekawa 103:
104: typedef (*linux_line_func_ptr) __PROTO((int x1, int y1, int x2, int y2));
105:
106: static void LINUX_putc __PROTO((unsigned int x, unsigned int y, int c, int ang,
107: linux_line_func_ptr line_func));
108:
109: /* this function is called at the very beginning of main() to initialize
110: * the vgalib and to revoke suid privileges.
111: * /dev/console and /dev/tty\d are considered graphic terminals, all other
112: * don't support the linux terminal */
113:
1.1.1.2 ! maekawa 114: void
! 115: LINUX_setup(void)
1.1 maekawa 116: {
117: char line[256];
118: FILE *pipe;
119:
120: LINUX_graphics_allowed = FALSE;
121:
122: if (geteuid() != 0)
123: return; /* if we aren't root, we cannot init graphics */
124:
125: if ((pipe = popen("/usr/bin/tty", "r")) != NULL) {
126: line[0] = 0;
127: fgets(line, 256, pipe);
128: pclose(pipe);
129: line[strlen(line) - 1] = '\0';
130: if (strcmp(line, "/dev/console") == 0 ||
131: (strncmp(line, "/dev/tty", 8) == 0 && isdigit(line[8])))
132: LINUX_graphics_allowed = TRUE;
133: }
134: if (LINUX_graphics_allowed) {
1.1.1.2 ! maekawa 135: take_privilege();
1.1 maekawa 136: vga_init();
1.1.1.2 ! maekawa 137: drop_privilege();
1.1 maekawa 138: } else {
139: /* err - shouldn't we give up root uid whatever happens ?
140: * or perhaps vga_init() does it ?
141: */
142: setuid(getuid());
143: }
144: }
145:
1.1.1.2 ! maekawa 146: TERM_PUBLIC
! 147: void LINUX_options()
1.1 maekawa 148: {
149: if (!LINUX_graphics_allowed) {
1.1.1.2 ! maekawa 150: int_error("Linux terminal driver not available",NO_CARET);
1.1 maekawa 151: }
152: fprintf(stderr, "%s\n", vga_getmodename(linux_vmode));
153: }
154:
1.1.1.2 ! maekawa 155: TERM_PUBLIC
! 156: void LINUX_init()
1.1 maekawa 157: {
158: /* vga_init () has been moved to immediately after main () for security */
159: if (vga_getdefaultmode() != -1)
160: linux_vmode = vga_getdefaultmode();
161: /* get the default mode from GSVGAMODE, if available */
162: if (!vga_hasmode(linux_vmode))
163: linux_vmode = G640x480x16;
164: /* test default mode first */
165: if (!vga_hasmode(linux_vmode)) {
166: fputs("Error, unable to initiate graphics.\n", stderr);
167: return;
168: } /* this mode is the bottom line */
169: modeinfo = vga_getmodeinfo(linux_vmode);
170: term->xmax = modeinfo->width;
171: term->ymax = modeinfo->height;
172: linux_lasty = modeinfo->height - 1;
173: }
174:
1.1.1.2 ! maekawa 175: TERM_PUBLIC void
! 176: LINUX_reset()
1.1 maekawa 177: {
178: if (graphics_on) {
179: vga_setmode(TEXT);
180: graphics_on = FALSE;
181: }
182: }
183:
1.1.1.2 ! maekawa 184: TERM_PUBLIC void
! 185: LINUX_text()
1.1 maekawa 186: {
187: if (graphics_on) {
188: vga_getch();
189: vga_setmode(TEXT);
190: graphics_on = FALSE;
191: }
192: }
193:
1.1.1.2 ! maekawa 194: TERM_PUBLIC void
! 195: LINUX_graphics()
1.1 maekawa 196: {
197: if (!graphics_on) {
198: vga_setmode(linux_vmode);
199: graphics_on = TRUE;
200: }
201: }
202:
1.1.1.2 ! maekawa 203: TERM_PUBLIC void
! 204: LINUX_suspend()
1.1 maekawa 205: {
206: vga_flip();
207: }
208:
1.1.1.2 ! maekawa 209: TERM_PUBLIC void
! 210: LINUX_resume()
1.1 maekawa 211: {
212: vga_flip();
213: }
214:
1.1.1.2 ! maekawa 215: TERM_PUBLIC void
! 216: LINUX_linetype(linetype)
1.1 maekawa 217: int linetype;
218: {
219: if (linetype >= 13)
220: linetype %= 13;
221: vga_setcolor(vgacolor[linetype + 2]);
222: }
223:
1.1.1.2 ! maekawa 224: TERM_PUBLIC void
! 225: LINUX_move(x, y)
1.1 maekawa 226: unsigned int x;
227: unsigned int y;
228: {
229: linux_startx = x;
230: linux_starty = y;
231: }
232:
1.1.1.2 ! maekawa 233: TERM_PUBLIC void
! 234: LINUX_vector(x, y)
1.1 maekawa 235: unsigned int x;
236: unsigned int y;
237: {
238: vga_drawline(linux_startx, linux_lasty - linux_starty, x, linux_lasty - y);
239: linux_startx = x;
240: linux_starty = y;
241: }
242:
1.1.1.2 ! maekawa 243: TERM_PUBLIC int
! 244: LINUX_text_angle(ang)
1.1 maekawa 245: int ang;
246: {
247: linux_angle = ang;
248: return TRUE;
249: }
250:
1.1.1.2 ! maekawa 251: static void
! 252: LINUX_putc(x, y, c, ang, line_func)
1.1 maekawa 253: unsigned int x, y;
254: int c;
255: int ang;
256: linux_line_func_ptr line_func;
257: {
258: int i, j, k;
259: unsigned int pixelon;
260: i = (int) (c) - 32;
261: for (j = 0; j < FNT5X9_VBITS; j++) {
262: for (k = 0; k < FNT5X9_HBITS; k++) {
263: pixelon = (((unsigned int) (fnt5x9[i][j])) >> k & 1);
264: if (pixelon) {
265: switch (ang) {
266: case 0:
267: (*line_func) (x + k + 1, y - j, x + k + 1, y - j);
268: break;
269: case 1:
270: (*line_func) (x - j, y - k - 1, x - j, y - k - 1);
271: break;
272: }
273: }
274: }
275: }
276: }
277:
1.1.1.2 ! maekawa 278: TERM_PUBLIC void
! 279: LINUX_put_text(x, y, str)
1.1 maekawa 280: unsigned int x, y;
1.1.1.2 ! maekawa 281: const char *str;
1.1 maekawa 282: {
283: int i;
284: switch (linux_angle) {
285: case 0:
286: y -= LINUX_VCHAR / 2;
287: break;
288: case 1:
289: x += LINUX_VCHAR / 2;
290: break;
291: }
292: for (i = 0; str[i]; i++) {
293: LINUX_putc(x, linux_lasty - y, str[i], linux_angle, vga_drawline);
294: switch (linux_angle) {
295: case 0:
296: x += LINUX_HCHAR;
297: break;
298: case 1:
299: y += LINUX_HCHAR;
300: break;
301: }
302: }
303: }
304:
305: #endif
306:
307: #ifdef TERM_TABLE
308: TERM_TABLE_START(linux_driver)
309: "linux", "Linux PC with (s)vgalib",
310: LINUX_XMAX, LINUX_YMAX, LINUX_VCHAR, LINUX_HCHAR,
311: LINUX_VTIC, LINUX_HTIC, LINUX_options, LINUX_init, LINUX_reset,
312: LINUX_text, null_scale, LINUX_graphics, LINUX_move, LINUX_vector,
313: LINUX_linetype, LINUX_put_text, LINUX_text_angle,
314: null_justify_text, do_point, do_arrow, set_font_null,
315: 0, /* pointsize */
316: TERM_CAN_MULTIPLOT, LINUX_suspend, LINUX_resume
317: TERM_TABLE_END(linux_driver)
318: #undef LAST_TERM
319: #define LAST_TERM linux_driver
320: #endif
321:
322: #ifdef TERM_HELP
323: START_HELP(linux)
324: "1 linux",
325: "?commands set terminal linux",
326: "?set terminal linux",
327: "?set term linux",
328: "?terminal linux",
329: "?term linux",
330: "?linux",
331: " The `linux` driver has no additional options to specify. It looks at the",
332: " environment variable GSVGAMODE for the default mode; if not set, it uses",
333: " 1024x768x256 as default mode or, if that is not possible, 640x480x16",
334: " (standard VGA)."
335: END_HELP(linux)
336: #endif
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