summaryrefslogtreecommitdiff
path: root/loadfont.c
blob: 5e1f04d76e596c8e3f9623798b08392ed3719e0a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
/* 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 "internal.h"
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <memory.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <errno.h>
#include <sys/ioctl.h>
#include <sys/kd.h>
#include <endian.h>

#define PSF_MAGIC1	0x36
#define PSF_MAGIC2	0x04

#define PSF_MODE512    0x01
#define PSF_MODEHASTAB 0x02
#define PSF_MAXMODE    0x03
#define PSF_SEPARATOR  0xFFFF

static const char loadfont_usage[] = "loadfont\n\n"
	"Loads a console font from standard input.\n";

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);

extern int loadfont_main(int argc, char **argv)
{
	int fd;

	if (argc>=2 && *argv[1]=='-') {
		usage(loadfont_usage);
	}

	fd = open("/dev/tty0", O_RDWR);
	if (fd < 0) {
		fprintf(stderr, "Error opening /dev/tty0: %s\n", strerror(errno));
		return( FALSE);
	}
	loadnewfont(fd);

	return( TRUE);
}

static void do_loadfont(int fd, char *inbuf, int unit, int fontsize)
{
	char buf[16384];
	int i;

	memset(buf, 0, sizeof(buf));

	if (unit < 1 || unit > 32) {
		fprintf(stderr, "Bad character size %d\n", unit);
		exit(1);
	}

	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 */
		perror("PIO_FONTX ioctl error (trying PIO_FONT)");
	}
#endif
	if (ioctl(fd, PIO_FONT, buf)) {
		perror("PIO_FONT ioctl error");
		exit(1);
	}
}

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;
	u_short unicode;

	maxct = tailsz;				/* more than enough */
	up = (struct unipair *) malloc(maxct * sizeof(struct unipair));

	if (!up) {
		fprintf(stderr, "Out of memory?\n");
		exit(1);
	}
	for (glyph = 0; glyph < fontsize; glyph++) {
		while (tailsz >= 2) {
			unicode = (((u_short) 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) {
			fprintf(stderr, "It seems this kernel is older than 1.1.92\n");
			fprintf(stderr, "No Unicode mapping table loaded.\n");
		} else
#endif
			perror("PIO_UNIMAPCLR");
		exit(1);
	}
	ud.entry_ct = ct;
	ud.entries = up;
	if (ioctl(fd, PIO_UNIMAP, &ud)) {
#if 0
		if (errno == ENOMEM) {
			/* change advice parameters */
		}
#endif
		perror("PIO_UNIMAP");
		exit(1);
	}
}

static void loadnewfont(int fd)
{
	int unit;
	char inbuf[32768];			/* primitive */
	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)) {
		perror("Error reading input font");
		exit(1);
	}
	/* 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)) {
		perror("Font too large");
		exit(1);
	}

	/* test for psf first */
	{
		struct psf_header psfhdr;
		int fontsize;
		int hastable;
		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) {
			fprintf(stderr, "Unsupported psf file mode\n");
			exit(1);
		}
		fontsize = ((psfhdr.mode & PSF_MODE512) ? 512 : 256);
#if !defined( PIO_FONTX ) || defined( __sparc__ )
		if (fontsize != 256) {
			fprintf(stderr, "Only fontsize 256 supported\n");
			exit(1);
		}
#endif
		hastable = (psfhdr.mode & PSF_MODEHASTAB);
		unit = psfhdr.charsize;
		head0 = sizeof(struct psf_header);

		head = head0 + fontsize * unit;
		if (head > inputlth || (!hastable && head != inputlth)) {
			fprintf(stderr, "Input file: bad length\n");
			exit(1);
		}
		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) {
			fprintf(stderr, "Bad input file size\n");
			exit(1);
		}
		offset = 0;
		unit = inputlth / 256;
	}
	do_loadfont(fd, inbuf + offset, unit, 256);
}