Felisp
84436a5ae0
http://my.svgalib.org/svgalib/svgalib-1.9.25.tar.gz http://my.svgalib.org/svgalib/
121 lines
2.8 KiB
C
121 lines
2.8 KiB
C
#include <stdlib.h>
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#include <stdio.h>
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#include <vga.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include "../src/libvga.h"
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/*
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* Note: Observe that when writing the font to a file, the file to write is
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* opened after vga_init has been called (so that root permissions have been
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* given up). This means that there is no major security hole lurking here.
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*/
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int main(int argc, char *argv[])
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{
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FILE *f;
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unsigned char *font;
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size_t font_size = FONT_SIZE; /* buffer size in 1.2.11 and before */
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int can_set = 0;
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struct stat statbuf;
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if (argc == 1) {
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printf("Restore corrupted textmode font.\n");
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printf("Syntax: restorefont option filename\n");
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printf(" -r filename Restore VGA font from file.\n");
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printf(" -w filename Write current VGA font to file.\n");
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return 0;
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}
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if (argv[1][0] != '-') {
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printf("Must specify -r or -w.\n");
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return 1;
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}
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switch (argv[1][1]) {
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case 'r':
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case 'w':
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if (argc != 3) {
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printf("Must specify filename.\n");
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return 1;
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}
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break;
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default:
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printf("Invalid option. Must specify -r or -w.\n");
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return 1;
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}
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vga_disabledriverreport();
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vga_setchipset(VGA); /* avoid SVGA detection */
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vga_init();
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/* we are in TEXT mode. Check for availability of vga_ext_set: */
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if (vga_getmodeinfo(TEXT)->flags & HAVE_EXT_SET) {
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if (vga_ext_set(VGA_EXT_AVAILABLE, VGA_AVAIL_SET) &
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(1 << VGA_EXT_FONT_SIZE)) {
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can_set = 1;
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/* Query the preferred data size: */
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font_size = vga_ext_set(VGA_EXT_FONT_SIZE, 0);
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if (font_size < FONT_SIZE) {
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font_size = FONT_SIZE;
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}
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}
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}
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/* We never need more than that memory: */
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font = malloc((size_t)font_size);
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if (!font) {
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puts("restorefont: out of memory.");
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goto ex_no_errno;
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}
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vga_setmode(G640x350x16);
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switch (argv[1][1]) {
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case 'r':
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f = fopen(argv[2], "rb");
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if (f == NULL) {
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error:
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perror("restorefont");
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ex_no_errno:
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vga_setmode(TEXT);
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return 1;
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}
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if (fstat(fileno(f), &statbuf))
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goto error;
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font_size = statbuf.st_size;
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/* Check for sensible sizes: */
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switch (font_size) {
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case 0x2000:
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case 0x2000 * 4:
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case 0x2000 * 8:
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if (can_set)
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vga_ext_set(VGA_EXT_FONT_SIZE, font_size);
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break;
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default:
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corrupt:
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puts("restorefont: input file corrupted.");
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goto ex_no_errno;
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}
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if (1 != fread(font, font_size, 1, f)) {
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if (errno)
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goto error;
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goto corrupt;
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}
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fclose(f);
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vga_puttextfont(font);
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break;
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case 'w':
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/* save as much as we have.. */
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if (can_set)
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vga_ext_set(VGA_EXT_FONT_SIZE, font_size);
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vga_gettextfont(font);
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f = fopen(argv[2], "wb");
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if (f == NULL)
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goto error;
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if (1 != fwrite(font, font_size, 1, f))
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goto error;
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if (fclose(f))
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goto error;
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break;
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}
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vga_setmode(TEXT);
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return 0;
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}
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