fixes grep, added loadfont from debian bootfloppies.
-Erik
This commit is contained in:
Eric Andersen
234
loadfont.c
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234
loadfont.c
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/*
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* loadfont.c - Eugene Crosser & Andries Brouwer
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*
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* Version 0.96bb
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*
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* Loads the console font, and possibly the corresponding screen map(s).
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* (Adapted for busybox by Matej Vela.)
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*/
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#include "internal.h"
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#include <stdio.h>
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#include <string.h>
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#include <fcntl.h>
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#include <memory.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <errno.h>
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#include <sys/ioctl.h>
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#include <sys/kd.h>
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#include <endian.h>
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#define PSF_MAGIC1 0x36
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#define PSF_MAGIC2 0x04
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#define PSF_MODE512 0x01
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#define PSF_MODEHASTAB 0x02
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#define PSF_MAXMODE 0x03
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#define PSF_SEPARATOR 0xFFFF
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static const char loadfont_usage[] = "loadfont\n"
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"\n"
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"\tLoad a console font from standard input.\n"
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"\n";
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struct psf_header
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{
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unsigned char magic1, magic2; /* Magic number */
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unsigned char mode; /* PSF font mode */
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unsigned char charsize; /* Character size */
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};
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#define PSF_MAGIC_OK(x) ((x).magic1 == PSF_MAGIC1 && (x).magic2 == PSF_MAGIC2)
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static void loadnewfont(int fd);
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extern int
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loadfont_main(int argc, char **argv)
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{
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int fd;
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fd = open("/dev/tty0", O_RDWR);
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if (fd < 0) {
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fprintf(stderr, "Error opening /dev/tty0: %s\n", strerror(errno));
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return 1;
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}
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loadnewfont(fd);
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return 0;
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}
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static void
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do_loadfont(int fd, char *inbuf, int unit, int fontsize) {
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char buf[16384];
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int i;
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memset(buf,0,sizeof(buf));
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if (unit < 1 || unit > 32) {
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fprintf(stderr, "Bad character size %d\n", unit);
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exit(1);
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}
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for (i = 0; i < fontsize; i++)
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memcpy(buf+(32*i), inbuf+(unit*i), unit);
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#if defined( PIO_FONTX ) && !defined( sparc )
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{
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struct consolefontdesc cfd;
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cfd.charcount = fontsize;
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cfd.charheight = unit;
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cfd.chardata = buf;
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if (ioctl(fd, PIO_FONTX, &cfd) == 0)
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return; /* success */
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perror("PIO_FONTX ioctl error (trying PIO_FONT)");
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}
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#endif
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if (ioctl(fd, PIO_FONT, buf)) {
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perror("PIO_FONT ioctl error");
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exit(1);
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}
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}
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static void
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do_loadtable(int fd, unsigned char *inbuf, int tailsz, int fontsize) {
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struct unimapinit advice;
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struct unimapdesc ud;
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struct unipair *up;
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int ct = 0, maxct;
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int glyph;
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u_short unicode;
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maxct = tailsz; /* more than enough */
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up = (struct unipair *) malloc(maxct * sizeof(struct unipair));
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if (!up) {
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fprintf(stderr, "Out of memory?\n");
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exit(1);
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}
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for (glyph = 0; glyph < fontsize; glyph++) {
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while (tailsz >= 2) {
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unicode = (((u_short) inbuf[1]) << 8) + inbuf[0];
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tailsz -= 2;
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inbuf += 2;
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if (unicode == PSF_SEPARATOR)
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break;
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up[ct].unicode = unicode;
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up[ct].fontpos = glyph;
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ct++;
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}
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}
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/* Note: after PIO_UNIMAPCLR and before PIO_UNIMAP
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this printf did not work on many kernels */
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advice.advised_hashsize = 0;
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advice.advised_hashstep = 0;
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advice.advised_hashlevel = 0;
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if(ioctl(fd, PIO_UNIMAPCLR, &advice)) {
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#ifdef ENOIOCTLCMD
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if (errno == ENOIOCTLCMD) {
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fprintf(stderr, "It seems this kernel is older than 1.1.92\n");
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fprintf(stderr, "No Unicode mapping table loaded.\n");
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} else
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#endif
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perror("PIO_UNIMAPCLR");
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exit(1);
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}
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ud.entry_ct = ct;
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ud.entries = up;
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if(ioctl(fd, PIO_UNIMAP, &ud)) {
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#if 0
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if (errno == ENOMEM) {
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/* change advice parameters */
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}
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#endif
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perror("PIO_UNIMAP");
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exit(1);
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}
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}
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static void
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loadnewfont(int fd) {
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int unit;
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char inbuf[32768]; /* primitive */
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int inputlth, offset;
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/*
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* We used to look at the length of the input file
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* with stat(); now that we accept compressed files,
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* just read the entire file.
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*/
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inputlth = fread(inbuf, 1, sizeof(inbuf), stdin);
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if (ferror(stdin)) {
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perror("Error reading input font");
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exit(1);
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}
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/* use malloc/realloc in case of giant files;
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maybe these do not occur: 16kB for the font,
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and 16kB for the map leaves 32 unicode values
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for each font position */
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if (!feof(stdin)) {
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perror("Font too large");
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exit(1);
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}
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/* test for psf first */
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{
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struct psf_header psfhdr;
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int fontsize;
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int hastable;
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int head0, head;
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if (inputlth < sizeof(struct psf_header))
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goto no_psf;
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psfhdr = * (struct psf_header *) &inbuf[0];
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if (!PSF_MAGIC_OK(psfhdr))
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goto no_psf;
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if (psfhdr.mode > PSF_MAXMODE) {
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fprintf(stderr, "Unsupported psf file mode\n");
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exit(1);
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}
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fontsize = ((psfhdr.mode & PSF_MODE512) ? 512 : 256);
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#if !defined( PIO_FONTX ) || defined( sparc )
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if (fontsize != 256) {
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fprintf(stderr, "Only fontsize 256 supported\n");
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exit(1);
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}
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#endif
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hastable = (psfhdr.mode & PSF_MODEHASTAB);
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unit = psfhdr.charsize;
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head0 = sizeof(struct psf_header);
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head = head0 + fontsize*unit;
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if (head > inputlth || (!hastable && head != inputlth)) {
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fprintf(stderr, "Input file: bad length\n");
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exit(1);
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}
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do_loadfont(fd, inbuf + head0, unit, fontsize);
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if (hastable)
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do_loadtable(fd, inbuf + head, inputlth-head, fontsize);
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return;
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}
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no_psf:
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/* file with three code pages? */
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if (inputlth == 9780) {
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offset = 40;
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unit = 16;
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} else {
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/* bare font */
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if (inputlth & 0377) {
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fprintf(stderr, "Bad input file size\n");
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exit(1);
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}
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offset = 0;
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unit = inputlth/256;
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}
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do_loadfont(fd, inbuf+offset, unit, 256);
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}
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