--- /dev/null
+/* Hello, Emacs, this is -*-C-*-
+ * $Id: linux.trm,v 1.29 2006/07/21 02:35:47 sfeam Exp $
+ *
+ */
+
+/* GNUPLOT - linux.trm */
+
+/*[
+ * Copyright 1993, 1998, 2004
+ *
+ * Permission to use, copy, and distribute this software and its
+ * documentation for any purpose with or without fee is hereby granted,
+ * provided that the above copyright notice appear in all copies and
+ * that both that copyright notice and this permission notice appear
+ * in supporting documentation.
+ *
+ * Permission to modify the software is granted, but not the right to
+ * distribute the complete modified source code. Modifications are to
+ * be distributed as patches to the released version. Permission to
+ * distribute binaries produced by compiling modified sources is granted,
+ * provided you
+ * 1. distribute the corresponding source modifications from the
+ * released version in the form of a patch file along with the binaries,
+ * 2. add special version identification to distinguish your version
+ * in addition to the base release version number,
+ * 3. provide your name and address as the primary contact for the
+ * support of your modified version, and
+ * 4. retain our contact information in regard to use of the base
+ * software.
+ * Permission to distribute the released version of the source code along
+ * with corresponding source modifications in the form of a patch file is
+ * granted with same provisions 2 through 4 for binary distributions.
+ *
+ * This software is provided "as is" without express or implied warranty
+ * to the extent permitted by applicable law.
+]*/
+
+/*
+ * This file is included by ../term.c.
+ *
+ * This terminal driver supports:
+ * SVGA up to 1024x768x256 for PC's running the Linux Operating System
+ * (also VGA 640x480x16, and SVGA 800x600x256)
+ *
+ * AUTHOR
+ * Scott Heavner (sdh@po.cwru.edu)
+ * based on original linux.trm by Tommy Frandsen (frandsen@diku.dk)
+ * patched by David J. Liu (liu@molecule.phri.nyu.edu)
+ * to increase perfomance and safety based on the features of SVGALib/GL.
+ * send your comments or suggestions to (pixar!info-gnuplot@sun.com).
+ */
+
+/*
+ * Compile with Linux SVGAlib 0.95 currently maintained by
+ * Harm Hanemaayer (hhanemaa@cs.ruu.nl).
+ * supports Trident, Tseng, Cirrus, Oak and generic vga.
+ */
+
+#include "driver.h"
+
+#ifdef TERM_REGISTER
+register_term(linux)
+#endif
+
+#ifdef TERM_PROTO
+
+#define LINUX_VCHAR FNT5X9_VCHAR
+#define LINUX_HCHAR FNT5X9_HCHAR
+#define LINUX_VTIC 5
+#define LINUX_HTIC 5
+#define LINUX_XMAX 0 /* These two entries are just place holders. */
+#define LINUX_YMAX 0 /* The actual values will be filled in init. */
+
+TERM_PUBLIC void LINUX_options __PROTO((void));
+TERM_PUBLIC void LINUX_init __PROTO((void));
+TERM_PUBLIC void LINUX_reset __PROTO((void));
+TERM_PUBLIC void LINUX_text __PROTO((void));
+TERM_PUBLIC void LINUX_graphics __PROTO((void));
+TERM_PUBLIC void LINUX_linetype __PROTO((int linetype));
+TERM_PUBLIC void LINUX_move __PROTO((unsigned int x, unsigned int y));
+TERM_PUBLIC void LINUX_vector __PROTO((unsigned int x, unsigned int y));
+TERM_PUBLIC int LINUX_text_angle __PROTO((int ang));
+TERM_PUBLIC void LINUX_put_text __PROTO((unsigned int x, unsigned int y, const char *str));
+TERM_PUBLIC void LINUX_suspend __PROTO((void));
+TERM_PUBLIC void LINUX_resume __PROTO((void));
+
+/* also used in vgagl.trm, so export it: */
+TERM_PUBLIC int LINUX_graphics_allowed;
+
+#endif
+
+#ifdef TERM_BODY
+
+#define _STRING_H_
+#include <vga.h>
+
+static int linux_vmode = G1024x768x256; /* default mode */
+static int vgacolor[] = { 7, 8, 2, 3, 4, 5, 9, 14, 12, 15, 13, 10, 11, 1, 6 };
+static int graphics_on = FALSE;
+static vga_modeinfo *modeinfo;
+static int linux_startx, linux_starty, linux_lasty;
+static int linux_angle;
+TERM_PUBLIC int LINUX_graphics_allowed = FALSE; /* also used in vgagl.trm */
+extern void drop_privilege __PROTO((void));
+extern void take_privilege __PROTO((void));
+
+typedef int (*linux_line_func_ptr) __PROTO((int x1, int y1, int x2, int y2));
+
+static void LINUX_putc __PROTO((unsigned int x, unsigned int y, int c, int ang,
+ linux_line_func_ptr line_func));
+
+/* this function is called at the very beginning of main() to initialize
+ * the vgalib and to revoke suid privileges.
+ * /dev/console and /dev/tty\d and /dev/vc/\d are considered graphic terminals, all other
+ * don't support the linux terminal */
+
+void
+LINUX_setup()
+{
+ char line[256];
+ FILE *pipe;
+
+ LINUX_graphics_allowed = FALSE;
+
+ if (geteuid() != 0)
+ return; /* if we aren't root, we cannot init graphics */
+
+ if ((pipe = popen("/usr/bin/tty", "r")) != NULL) {
+ line[0] = 0;
+ fgets(line, 256, pipe);
+ pclose(pipe);
+ line[strlen(line) - 1] = '\0';
+ if (
+ strcmp(line, "/dev/console") == 0 ||
+
+ ( ( strncmp(line, "/dev/tty", 8) == 0 || strncmp(line, "/dev/vc/", 8) == 0 )
+ && isdigit((unsigned char) line[8]))
+
+ ) {
+ LINUX_graphics_allowed = TRUE;
+ } else {
+ /* check for socket name as set for example by `screen' */
+ char* sty = getenv("STY");
+ if (sty) {
+ int n1, n2;
+ if (3 == sscanf(sty, "%d.tty%d.%s", &n1, &n2, line)) {
+ /* we could check here, if host is the
+ * same as gethostname() returns. */
+ LINUX_graphics_allowed = TRUE;
+ }
+ }
+ }
+ }
+ if (LINUX_graphics_allowed) {
+ take_privilege();
+ vga_init();
+ drop_privilege();
+ } else {
+ /* err - shouldn't we give up root uid whatever happens ?
+ * or perhaps vga_init() does it ?
+ */
+ setuid(getuid());
+ }
+}
+
+TERM_PUBLIC
+void LINUX_options()
+{
+ if (!LINUX_graphics_allowed) {
+ int_error(NO_CARET, "Linux terminal driver not available");
+ }
+ fprintf(stderr, "%s\n", vga_getmodename(linux_vmode));
+}
+
+TERM_PUBLIC
+void LINUX_init()
+{
+ /* vga_init () has been moved to immediately after main () for security */
+ if (vga_getdefaultmode() != -1)
+ linux_vmode = vga_getdefaultmode();
+ /* get the default mode from GSVGAMODE, if available */
+ if (!vga_hasmode(linux_vmode))
+ linux_vmode = G640x480x16;
+ /* test default mode first */
+ if (!vga_hasmode(linux_vmode)) {
+ fputs("Error, unable to initiate graphics.\n", stderr);
+ return;
+ } /* this mode is the bottom line */
+ modeinfo = vga_getmodeinfo(linux_vmode);
+ term->xmax = modeinfo->width;
+ term->ymax = modeinfo->height;
+ linux_lasty = modeinfo->height - 1;
+}
+
+TERM_PUBLIC void
+LINUX_reset()
+{
+ if (graphics_on) {
+ vga_setmode(TEXT);
+ graphics_on = FALSE;
+ }
+}
+
+TERM_PUBLIC void
+LINUX_text()
+{
+ if (graphics_on) {
+ vga_getch();
+ vga_setmode(TEXT);
+ graphics_on = FALSE;
+ }
+}
+
+TERM_PUBLIC void
+LINUX_graphics()
+{
+ if (!graphics_on) {
+ vga_setmode(linux_vmode);
+ graphics_on = TRUE;
+ }
+}
+
+TERM_PUBLIC void
+LINUX_suspend()
+{
+ vga_flip();
+}
+
+TERM_PUBLIC void
+LINUX_resume()
+{
+ vga_flip();
+}
+
+TERM_PUBLIC void
+LINUX_linetype(int linetype)
+{
+ if (linetype < -2)
+ linetype = LT_BLACK;
+ if (linetype >= 13)
+ linetype %= 13;
+ vga_setcolor(vgacolor[linetype + 2]);
+}
+
+TERM_PUBLIC void
+LINUX_move(unsigned int x, unsigned int y)
+{
+ linux_startx = x;
+ linux_starty = y;
+}
+
+TERM_PUBLIC void
+LINUX_vector(unsigned int x, unsigned int y)
+{
+ vga_drawline(linux_startx, linux_lasty - linux_starty, x, linux_lasty - y);
+ linux_startx = x;
+ linux_starty = y;
+}
+
+TERM_PUBLIC int
+LINUX_text_angle(int ang)
+{
+ linux_angle = (ang ? 1 : 0);
+ return TRUE;
+}
+
+static void
+LINUX_putc(
+ unsigned int x, unsigned int y,
+ int c,
+ int ang,
+ linux_line_func_ptr line_func)
+{
+ int i, j, k;
+ unsigned int pixelon;
+
+ i = (int) (c) - 32;
+ for (j = 0; j < FNT5X9_VBITS; j++) {
+ for (k = 0; k < FNT5X9_HBITS; k++) {
+ pixelon = (((unsigned int) (fnt5x9[i][j])) >> k & 1);
+ if (pixelon) {
+ switch (ang) {
+ case 0:
+ (*line_func) (x + k + 1, y - j, x + k + 1, y - j);
+ break;
+ case 1:
+ (*line_func) (x - j, y - k - 1, x - j, y - k - 1);
+ break;
+ }
+ }
+ }
+ }
+}
+
+TERM_PUBLIC void
+LINUX_put_text(unsigned int x, unsigned int y, const char *str)
+{
+ int i;
+ switch (linux_angle) {
+ case 0:
+ y -= LINUX_VCHAR / 2;
+ break;
+ case 1:
+ x += LINUX_VCHAR / 2;
+ break;
+ }
+ for (i = 0; str[i]; i++) {
+ LINUX_putc(x, linux_lasty - y, str[i], linux_angle, vga_drawline);
+ switch (linux_angle) {
+ case 0:
+ x += LINUX_HCHAR;
+ break;
+ case 1:
+ y += LINUX_HCHAR;
+ break;
+ }
+ }
+}
+
+#endif
+
+#ifdef TERM_TABLE
+TERM_TABLE_START(linux_driver)
+ "linux", "Linux PC with (s)vgalib",
+ LINUX_XMAX, LINUX_YMAX, LINUX_VCHAR, LINUX_HCHAR,
+ LINUX_VTIC, LINUX_HTIC, LINUX_options, LINUX_init, LINUX_reset,
+ LINUX_text, null_scale, LINUX_graphics, LINUX_move, LINUX_vector,
+ LINUX_linetype, LINUX_put_text, LINUX_text_angle,
+ null_justify_text, do_point, do_arrow, set_font_null,
+ 0, /* pointsize */
+ TERM_CAN_MULTIPLOT, LINUX_suspend, LINUX_resume
+TERM_TABLE_END(linux_driver)
+#undef LAST_TERM
+#define LAST_TERM linux_driver
+#endif
+
+#ifdef TERM_HELP
+START_HELP(linux)
+"1 linux",
+"?commands set terminal linux",
+"?set terminal linux",
+"?set term linux",
+"?terminal linux",
+"?term linux",
+"?linux",
+" The `linux` driver has no additional options to specify. It looks at the",
+" environment variable GSVGAMODE for the default mode; if not set, it uses",
+" 1024x768x256 as default mode or, if that is not possible, 640x480x16",
+" (standard VGA)."
+END_HELP(linux)
+#endif
projects / gnuplot / blobdiff