Initial. Don't... just don't ask.
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Ryan McGrath
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258
demos/eventtest.c
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258
demos/eventtest.c
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/* Program to test the vga_waitevent function. */
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <vga.h>
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#include <vgagl.h>
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#include <vgamouse.h>
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#include <vgakeyboard.h>
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#define USE_RAWKEYBOARD
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static int newcolor(void)
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{
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if (BYTESPERPIXEL == 1)
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return random() % 15 + 1;
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return gl_rgbcolor(random() & 255, random() & 255, random() & 255);
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}
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static void ping(void)
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{
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putchar('\a');
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fflush(stdout);
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}
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/* read data from fd. Write string if '\n' encountered */
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void process_input(int fd)
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{
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static char textbuf[80], *data = textbuf;
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char inbuf[80];
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int len, i;
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len = read(fd, inbuf, 80);
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if (len <= 0)
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return;
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for (i = 0; i < len; i++) {
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if (inbuf[i] == '\n') {
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*data = 0;
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gl_write(0, 10, textbuf);
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ping();
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data = textbuf;
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} else {
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*data++ = inbuf[i];
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}
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}
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}
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void child(int fd)
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{
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time_t last_time = 0, now;
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FILE *output;
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output = fdopen(fd, "w");
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for (;;) { /* when parent dies we get killed by SIGPIPE */
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now = time(NULL);
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if (now / 5 > last_time) { /* a new minute started */
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last_time = now / 5;
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fputs(ctime(&now), output);
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fputc('\n', output);
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fflush(output);
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}
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sleep(1);
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}
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}
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int main(void)
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{
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struct timeval timeout;
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fd_set inputs;
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char bitmap[16 * 16 * 4]; /* big enough for 10x10 bitmap in any mode */
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int vgamode, color, pipefd[2], x, y, button, event, cursorsize = 5;
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char loop = 1, drawcursor = 1;
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#ifdef USE_RAWKEYBOARD
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char space_pressed = 0;
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#endif
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puts("This is a demo showing the abilities of the new vga_waitevent() function\n"
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"If something goes wrong it might hang your machine. Thus hit <ctrl>-C now\n"
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"to bailout if in doubt.\n"
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"Use mouse to move cursor. 1-9,0 to set the cursor size. Space to change the\n"
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"cursor color. Left button to draw. Right button or 'Q' to bailout.\n"
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"The cursor goes on/off every half second by usage of a timeout passed to\n"
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"vga_waitevent. Every 5 secs a string from a child process (the time) arrives\n"
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"asynchronously and is displayed by the frontend.");
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#ifdef USE_RAWKEYBOARD
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puts("\nBEWARE! This has been compiled to use the raw keyboard. A crash might\n"
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"render the console unusable. (but shouldn't).");
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#endif
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fputs("\nHit <Enter> if brave enough, else ^C to bailout: ", stdout);
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fflush(stdout);
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getchar();
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fflush(stdin); /* clear I/O buffer */
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pipe(pipefd);
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if (fork() == 0) { /* fork off b4 touching graphix to avoid side effects */
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close(pipefd[0]); /* Important: close reading side, else it remains */
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/* opened by child when parent exits and we don't get */
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/* a SIGPIPE! */
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child(pipefd[1]);
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}
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vga_init();
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vgamode = vga_getdefaultmode();
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if (vgamode == -1)
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vgamode = G320x200x256;
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if (!vga_hasmode(vgamode)) {
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printf("Mode not available.\n");
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exit(-1);
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}
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/* Enable automatic mouse setup at mode set. */
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vga_setmousesupport(1);
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vga_setmode(vgamode);
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/* Disable wrapping (default). */
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/* mouse_setwrap(MOUSE_NOWRAP); */
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gl_setcontextvga(vgamode);
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gl_enableclipping();
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/* There might be some scrap data in the serial buffer
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from the mouse. It will make vga_waitevent block
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because it thinks the mouse wants to send data but
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then no mouse packet arrives. */
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color = newcolor();
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x = 0;
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y = 0;
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gl_setwritemode(WRITEMODE_OVERWRITE | FONT_COMPRESSED);
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gl_setfont(8, 8, gl_font8x8);
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gl_setfontcolors(0, newcolor());
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#ifdef USE_RAWKEYBOARD
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if (keyboard_init()) {
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printf("Could not initialize keyboard.\n");
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exit(1);
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}
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#endif
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while (loop) {
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gl_getbox(x, y, 10, 10, bitmap);
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if (drawcursor) {
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gl_hline(x, y, x + cursorsize, color);
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gl_hline(x, y + cursorsize, x + cursorsize, color);
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gl_line(x, y, x, y + cursorsize, color);
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gl_line(x + cursorsize, y, x + cursorsize, y + cursorsize, color);
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}
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FD_ZERO(&inputs);
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FD_SET(pipefd[0], &inputs);
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timeout.tv_sec = 0;
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timeout.tv_usec = 500000; /* 0.5 second time out */
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event = vga_waitevent(VGA_MOUSEEVENT | VGA_KEYEVENT,
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&inputs, NULL, NULL, &timeout);
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gl_putbox(x, y, 10, 10, bitmap);
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if (timeout.tv_sec || timeout.tv_usec) {
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/* No timeout. An actual event occured. Reset to visible
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cursor. Note:
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This is actually a bug as the cursor will get visible on time
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updates. However, it's better this way for demo/test
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purposes. */
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drawcursor = 1;
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} else {
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drawcursor ^= 1;
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}
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if (FD_ISSET(pipefd[0], &inputs))
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process_input(pipefd[0]);
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if (event & VGA_MOUSEEVENT) {
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x = mouse_getx();
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y = mouse_gety();
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button = mouse_getbutton();
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if (button & MOUSE_LEFTBUTTON)
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gl_fillbox(x, y, cursorsize + 1, cursorsize + 1, color);
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if (button & MOUSE_RIGHTBUTTON)
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loop = 0;
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}
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if (event & VGA_KEYEVENT) {
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#ifdef USE_RAWKEYBOARD
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if (keyboard_keypressed(SCANCODE_1))
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cursorsize = 0;
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if (keyboard_keypressed(SCANCODE_2))
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cursorsize = 1;
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if (keyboard_keypressed(SCANCODE_3))
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cursorsize = 2;
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if (keyboard_keypressed(SCANCODE_4))
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cursorsize = 3;
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if (keyboard_keypressed(SCANCODE_5))
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cursorsize = 4;
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if (keyboard_keypressed(SCANCODE_6))
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cursorsize = 5;
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if (keyboard_keypressed(SCANCODE_7))
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cursorsize = 6;
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if (keyboard_keypressed(SCANCODE_8))
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cursorsize = 7;
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if (keyboard_keypressed(SCANCODE_9))
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cursorsize = 8;
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if (keyboard_keypressed(SCANCODE_0))
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cursorsize = 9;
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if (keyboard_keypressed(SCANCODE_Q))
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loop = 0;
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if (keyboard_keypressed(SCANCODE_SPACE)) {
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if (!space_pressed) {
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color = newcolor();
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space_pressed = 1;
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}
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} else {
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space_pressed = 0;
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}
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#else
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switch (vga_getch()) {
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case '1':
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cursorsize = 0;
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break;
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case '2':
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cursorsize = 1;
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break;
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case '3':
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cursorsize = 2;
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break;
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case '4':
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cursorsize = 3;
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break;
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case '5':
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cursorsize = 4;
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break;
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case '6':
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cursorsize = 5;
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break;
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case '7':
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cursorsize = 6;
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break;
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case '8':
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cursorsize = 7;
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break;
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case '9':
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cursorsize = 8;
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break;
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case '0':
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cursorsize = 9;
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break;
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case ' ':
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color = newcolor();
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break;
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case 'q':
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case 'Q':
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loop = 0;
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break;
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default:
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ping();
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break;
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}
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#endif
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}
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}
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#ifdef USE_RAWKEYBOARD
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keyboard_close(); /* Don't forget this! */
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#endif
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vga_setmode(TEXT);
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exit(0);
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}
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