minix/commands/ibm/loadfont.c

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2005-04-21 16:53:53 +02:00
/* loadfont.c - Load custom font into EGA, VGA video card
*
* Author: Hrvoje Stipetic (hs@hck.hr) Jun-1995.
*
*/
#include <sys/types.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <termios.h>
#include <sys/ioctl.h>
void tell(char *s)
{
write(2, s, strlen(s));
}
char *itoa(unsigned i)
{
static char a[3*sizeof(int)];
char *p = a+sizeof(a)-1;
do {
*--p = '0' + i%10;
} while ((i /= 10) > 0);
return p;
}
void report(char *say)
{
int err = errno;
tell("loadfont: ");
if (say != NULL) {
tell(say);
tell(": ");
}
tell(strerror(err));
tell("\n");
}
void usage(void)
{
tell("Usage: loadfont fontfile\n");
exit(1);
}
int main(int argc, char *argv[])
{
static u8_t font[256][32];
static u8_t font_file[256 * (16+14+8) + 1];
u8_t *ff;
int fd, size, tsize, ch, ln;
struct winsize ws;
if (argc != 2)
usage();
if ((fd = open(argv[1], O_RDONLY)) < 0) {
report(argv[1]);
exit(1);
}
switch (read(fd, font_file, sizeof(font_file))) {
case 256 * 8:
size = 8;
break;
case 256 * 14:
size = 14;
break;
case 256 * 16:
size = 16;
break;
case 256 * (16+14+8):
size = 0;
break;
case -1:
report(argv[1]);
exit(1);
default:
tell("loadfont: ");
tell(argv[1]);
tell(": fontfile is not an 8x8, 8x14, 8x16, or compound font\n");
exit(1);
}
close(fd);
if (ioctl(0, TIOCGWINSZ, &ws) < 0 || (errno= ENOTTY, ws.ws_row == 0)) {
report(NULL);
exit(1);
}
tsize = ws.ws_ypixel / ws.ws_row;
if (size == 0) {
if (tsize >= 16) {
ff = font_file + 256 * (0);
} else
if (tsize >= 14) {
ff = font_file + 256 * (16);
} else {
ff = font_file + 256 * (16 + 14);
}
size = tsize;
} else {
ff = font_file;
}
for (ch = 0; ch < 256; ch++) {
for (ln = 0; ln < size; ln++) font[ch][ln] = ff[ch * size + ln];
}
if (ioctl(0, TIOCSFON, font) < 0) {
report(NULL);
exit(1);
}
exit(0);
}