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-rw-r--r--loadfont.c209
1 files changed, 0 insertions, 209 deletions
diff --git a/loadfont.c b/loadfont.c
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index d66500195..000000000
--- a/loadfont.c
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1/* vi: set sw=4 ts=4: */
2/*
3 * loadfont.c - Eugene Crosser & Andries Brouwer
4 *
5 * Version 0.96bb
6 *
7 * Loads the console font, and possibly the corresponding screen map(s).
8 * (Adapted for busybox by Matej Vela.)
9 */
10#include <stdio.h>
11#include <string.h>
12#include <fcntl.h>
13#include <memory.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <sys/types.h>
17#include <dirent.h>
18#include <errno.h>
19#include <sys/ioctl.h>
20#include <sys/kd.h>
21#include <endian.h>
22#include "busybox.h"
23
24static const int PSF_MAGIC1 = 0x36;
25static const int PSF_MAGIC2 = 0x04;
26
27static const int PSF_MODE512 = 0x01;
28static const int PSF_MODEHASTAB = 0x02;
29static const int PSF_MAXMODE = 0x03;
30static const int PSF_SEPARATOR = 0xFFFF;
31
32struct psf_header {
33 unsigned char magic1, magic2; /* Magic number */
34 unsigned char mode; /* PSF font mode */
35 unsigned char charsize; /* Character size */
36};
37
38#define PSF_MAGIC_OK(x) ((x).magic1 == PSF_MAGIC1 && (x).magic2 == PSF_MAGIC2)
39
40static void loadnewfont(int fd);
41
42extern int loadfont_main(int argc, char **argv)
43{
44 int fd;
45
46 if (argc != 1)
47 show_usage();
48
49 fd = open(CURRENT_VC, O_RDWR);
50 if (fd < 0)
51 perror_msg_and_die("Error opening " CURRENT_VC);
52 loadnewfont(fd);
53
54 return EXIT_SUCCESS;
55}
56
57static void do_loadfont(int fd, char *inbuf, int unit, int fontsize)
58{
59 char buf[16384];
60 int i;
61
62 memset(buf, 0, sizeof(buf));
63
64 if (unit < 1 || unit > 32)
65 error_msg_and_die("Bad character size %d", unit);
66
67 for (i = 0; i < fontsize; i++)
68 memcpy(buf + (32 * i), inbuf + (unit * i), unit);
69
70#if defined( PIO_FONTX ) && !defined( __sparc__ )
71 {
72 struct consolefontdesc cfd;
73
74 cfd.charcount = fontsize;
75 cfd.charheight = unit;
76 cfd.chardata = buf;
77
78 if (ioctl(fd, PIO_FONTX, &cfd) == 0)
79 return; /* success */
80 perror_msg("PIO_FONTX ioctl error (trying PIO_FONT)");
81 }
82#endif
83 if (ioctl(fd, PIO_FONT, buf))
84 perror_msg_and_die("PIO_FONT ioctl error");
85}
86
87static void
88do_loadtable(int fd, unsigned char *inbuf, int tailsz, int fontsize)
89{
90 struct unimapinit advice;
91 struct unimapdesc ud;
92 struct unipair *up;
93 int ct = 0, maxct;
94 int glyph;
95 u_short unicode;
96
97 maxct = tailsz; /* more than enough */
98 up = (struct unipair *) xmalloc(maxct * sizeof(struct unipair));
99
100 for (glyph = 0; glyph < fontsize; glyph++) {
101 while (tailsz >= 2) {
102 unicode = (((u_short) inbuf[1]) << 8) + inbuf[0];
103 tailsz -= 2;
104 inbuf += 2;
105 if (unicode == PSF_SEPARATOR)
106 break;
107 up[ct].unicode = unicode;
108 up[ct].fontpos = glyph;
109 ct++;
110 }
111 }
112
113 /* Note: after PIO_UNIMAPCLR and before PIO_UNIMAP
114 this printf did not work on many kernels */
115
116 advice.advised_hashsize = 0;
117 advice.advised_hashstep = 0;
118 advice.advised_hashlevel = 0;
119 if (ioctl(fd, PIO_UNIMAPCLR, &advice)) {
120#ifdef ENOIOCTLCMD
121 if (errno == ENOIOCTLCMD) {
122 error_msg("It seems this kernel is older than 1.1.92");
123 error_msg_and_die("No Unicode mapping table loaded.");
124 } else
125#endif
126 perror_msg_and_die("PIO_UNIMAPCLR");
127 }
128 ud.entry_ct = ct;
129 ud.entries = up;
130 if (ioctl(fd, PIO_UNIMAP, &ud)) {
131#if 0
132 if (errno == ENOMEM) {
133 /* change advice parameters */
134 }
135#endif
136 perror_msg_and_die("PIO_UNIMAP");
137 }
138}
139
140static void loadnewfont(int fd)
141{
142 int unit;
143 char inbuf[32768]; /* primitive */
144 unsigned int inputlth, offset;
145
146 /*
147 * We used to look at the length of the input file
148 * with stat(); now that we accept compressed files,
149 * just read the entire file.
150 */
151 inputlth = fread(inbuf, 1, sizeof(inbuf), stdin);
152 if (ferror(stdin))
153 perror_msg_and_die("Error reading input font");
154 /* use malloc/realloc in case of giant files;
155 maybe these do not occur: 16kB for the font,
156 and 16kB for the map leaves 32 unicode values
157 for each font position */
158 if (!feof(stdin))
159 perror_msg_and_die("Font too large");
160
161 /* test for psf first */
162 {
163 struct psf_header psfhdr;
164 int fontsize;
165 int hastable;
166 unsigned int head0, head;
167
168 if (inputlth < sizeof(struct psf_header))
169 goto no_psf;
170
171 psfhdr = *(struct psf_header *) &inbuf[0];
172
173 if (!PSF_MAGIC_OK(psfhdr))
174 goto no_psf;
175
176 if (psfhdr.mode > PSF_MAXMODE)
177 error_msg_and_die("Unsupported psf file mode");
178 fontsize = ((psfhdr.mode & PSF_MODE512) ? 512 : 256);
179#if !defined( PIO_FONTX ) || defined( __sparc__ )
180 if (fontsize != 256)
181 error_msg_and_die("Only fontsize 256 supported");
182#endif
183 hastable = (psfhdr.mode & PSF_MODEHASTAB);
184 unit = psfhdr.charsize;
185 head0 = sizeof(struct psf_header);
186
187 head = head0 + fontsize * unit;
188 if (head > inputlth || (!hastable && head != inputlth))
189 error_msg_and_die("Input file: bad length");
190 do_loadfont(fd, inbuf + head0, unit, fontsize);
191 if (hastable)
192 do_loadtable(fd, inbuf + head, inputlth - head, fontsize);
193 return;
194 }
195 no_psf:
196
197 /* file with three code pages? */
198 if (inputlth == 9780) {
199 offset = 40;
200 unit = 16;
201 } else {
202 /* bare font */
203 if (inputlth & 0377)
204 error_msg_and_die("Bad input file size");
205 offset = 0;
206 unit = inputlth / 256;
207 }
208 do_loadfont(fd, inbuf + offset, unit, 256);
209}
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