/* vi: set sw=4 ts=4: */ /* * loadfont.c - Eugene Crosser & Andries Brouwer * * Version 0.96bb * * Loads the console font, and possibly the corresponding screen map(s). * (Adapted for busybox by Matej Vela.) */ #include "libbb.h" #include <sys/kd.h> enum { PSF_MAGIC1 = 0x36, PSF_MAGIC2 = 0x04, PSF_MODE512 = 0x01, PSF_MODEHASTAB = 0x02, PSF_MAXMODE = 0x03, PSF_SEPARATOR = 0xFFFF }; struct psf_header { unsigned char magic1, magic2; /* Magic number */ unsigned char mode; /* PSF font mode */ unsigned char charsize; /* Character size */ }; #define PSF_MAGIC_OK(x) ((x).magic1 == PSF_MAGIC1 && (x).magic2 == PSF_MAGIC2) static void loadnewfont(int fd); int loadfont_main(int argc, char **argv); int loadfont_main(int argc, char **argv) { int fd; if (argc != 1) bb_show_usage(); fd = xopen(CURRENT_VC, O_RDWR); loadnewfont(fd); return EXIT_SUCCESS; } static void do_loadfont(int fd, unsigned char *inbuf, int unit, int fontsize) { char buf[16384]; int i; memset(buf, 0, sizeof(buf)); if (unit < 1 || unit > 32) bb_error_msg_and_die("bad character size %d", unit); for (i = 0; i < fontsize; i++) memcpy(buf + (32 * i), inbuf + (unit * i), unit); #if defined( PIO_FONTX ) && !defined( __sparc__ ) { struct consolefontdesc cfd; cfd.charcount = fontsize; cfd.charheight = unit; cfd.chardata = buf; if (ioctl(fd, PIO_FONTX, &cfd) == 0) return; /* success */ bb_perror_msg("PIO_FONTX ioctl error (trying PIO_FONT)"); } #endif if (ioctl(fd, PIO_FONT, buf)) bb_perror_msg_and_die("PIO_FONT ioctl error"); } static void do_loadtable(int fd, unsigned char *inbuf, int tailsz, int fontsize) { struct unimapinit advice; struct unimapdesc ud; struct unipair *up; int ct = 0, maxct; int glyph; uint16_t unicode; maxct = tailsz; /* more than enough */ up = xmalloc(maxct * sizeof(struct unipair)); for (glyph = 0; glyph < fontsize; glyph++) { while (tailsz >= 2) { unicode = (((uint16_t) inbuf[1]) << 8) + inbuf[0]; tailsz -= 2; inbuf += 2; if (unicode == PSF_SEPARATOR) break; up[ct].unicode = unicode; up[ct].fontpos = glyph; ct++; } } /* Note: after PIO_UNIMAPCLR and before PIO_UNIMAP this printf did not work on many kernels */ advice.advised_hashsize = 0; advice.advised_hashstep = 0; advice.advised_hashlevel = 0; if (ioctl(fd, PIO_UNIMAPCLR, &advice)) { #ifdef ENOIOCTLCMD if (errno == ENOIOCTLCMD) { bb_error_msg("it seems this kernel is older than 1.1.92"); bb_error_msg_and_die("no Unicode mapping table loaded"); } else #endif bb_perror_msg_and_die("PIO_UNIMAPCLR"); } ud.entry_ct = ct; ud.entries = up; if (ioctl(fd, PIO_UNIMAP, &ud)) { bb_perror_msg_and_die("PIO_UNIMAP"); } } static void loadnewfont(int fd) { int unit; unsigned char inbuf[32768]; /* primitive */ unsigned int inputlth, offset; /* * We used to look at the length of the input file * with stat(); now that we accept compressed files, * just read the entire file. */ inputlth = fread(inbuf, 1, sizeof(inbuf), stdin); if (ferror(stdin)) bb_perror_msg_and_die("error reading input font"); /* use malloc/realloc in case of giant files; maybe these do not occur: 16kB for the font, and 16kB for the map leaves 32 unicode values for each font position */ if (!feof(stdin)) bb_perror_msg_and_die("font too large"); /* test for psf first */ { struct psf_header psfhdr; int fontsize; int hastable; unsigned int head0, head; if (inputlth < sizeof(struct psf_header)) goto no_psf; psfhdr = *(struct psf_header *) &inbuf[0]; if (!PSF_MAGIC_OK(psfhdr)) goto no_psf; if (psfhdr.mode > PSF_MAXMODE) bb_error_msg_and_die("unsupported psf file mode"); fontsize = ((psfhdr.mode & PSF_MODE512) ? 512 : 256); #if !defined( PIO_FONTX ) || defined( __sparc__ ) if (fontsize != 256) bb_error_msg_and_die("only fontsize 256 supported"); #endif hastable = (psfhdr.mode & PSF_MODEHASTAB); unit = psfhdr.charsize; head0 = sizeof(struct psf_header); head = head0 + fontsize * unit; if (head > inputlth || (!hastable && head != inputlth)) bb_error_msg_and_die("input file: bad length"); do_loadfont(fd, inbuf + head0, unit, fontsize); if (hastable) do_loadtable(fd, inbuf + head, inputlth - head, fontsize); return; } no_psf: /* file with three code pages? */ if (inputlth == 9780) { offset = 40; unit = 16; } else { /* bare font */ if (inputlth & 0377) bb_error_msg_and_die("bad input file size"); offset = 0; unit = inputlth / 256; } do_loadfont(fd, inbuf + offset, unit, 256); }