disp_psf.c

This code understands the psf font format and displays all the glyphs in the file given, even if it is compressed with gzip

/****************************************************************
 * Copyright C 2002, Daniele Venzano                            *
 * This code is protected by the GPL License v. 2               *
 * You can find it al http://www.gnu.org                        *
 ****************************************************************/
#include <stdio.h>
#include "FBlib.h"

FILE *gunzip(FILE* fp, char* path)
{
	char command[200];
	
	fclose(fp);
	sprintf(command, "gunzip -c %s > /tmp/FBfont.psf", path);
	system(command);
	fp = fopen("/tmp/FBfont.psf", "r");
	system("rm /tmp/FBfont.psf");
	return fp;
}

int main(int argc, char *argv[])
{
	FILE *font;
	char byte;
	int filemode;
	char fontheight;
	int i,j,k;
	
	if(argc > 1)
	{
		font = fopen(argv[1], "r");
		if(font == NULL)
		{
			printf("%s was not found", argv[1]);
			return -1;
		}
	}
	else
		font = stdin;
	byte = fgetc(font);
	if(byte == 31)
	{
		byte = fgetc(font);
		if(byte = 139)
		{
			font = gunzip(font, argv[1]);
			byte = fgetc(font);
		}
	}
	if(byte != 0x36)
	{
		printf("%s is not a psf font file", argv[1]);
		return -1;
	}
	byte = fgetc(font);
	if(byte != 0x04)
	{
		printf("%s is not a psf font file", argv[1]);
		return -1;
	}
	filemode = fgetc(font);
	if(filemode == 1 || filemode == 3)
		filemode = 512;
	if(filemode == 0 || filemode == 2)
		filemode = 256;
	fontheight = fgetc(font);
	for(k=0; k < filemode; k++)
	{
	for(j=0; j < fontheight; j++)
	{
		byte = fgetc(font);
		for(i=128; i>0; i/=2)
		{
			if(byte & i)
				printf("O");
			else
				printf(" ");
		}
		printf("\n");
	}
	printf("\n");
	}

	fclose(font);
	return 0;
}