91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
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#include <stdlib.h>
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#include <stdio.h>
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#include <vga.h>
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#include "../src/driver.h"
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#include <errno.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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unsigned char regs[MAX_REGS];
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int
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main (int argc, char *argv[])
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{
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vga_init ();
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if (argc == 1)
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{
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printf ("Save/restore textmode registers.\n");
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printf ("Syntax: restoretextmode option filename\n");
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printf (" -r filename Restore registers from file.\n");
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printf (" -w filename Write registers 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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{
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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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{
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case 'r':
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case 'w':
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if (argc != 3)
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{
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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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if (argv[1][1] == 'r')
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{
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FILE *f;
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f = fopen (argv[2], "rb");
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if (f == NULL)
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{
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error:
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perror ("restoretextmode");
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return 1;
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}
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if (1 != fread (regs, MAX_REGS, 1, f))
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{
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if (errno)
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goto error;
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puts ("restoretextmode: input file corrupted.");
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return 1;
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}
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fclose (f);
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}
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vga_setmode (G640x350x16);
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switch (argv[1][1])
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{
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case 'r':
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vga_settextmoderegs (regs);
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break;
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case 'w':
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vga_gettextmoderegs (regs);
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break;
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}
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vga_setmode (TEXT);
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if (argv[1][1] == 'w')
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{
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FILE *f;
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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 (regs, MAX_REGS, 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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}
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return 0;
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}
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