Annotation of OpenXM_contrib/gnuplot/term/linux.trm, Revision 1.1.1.1
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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