apple2ix/src/genfont.c

/*
 * Apple // emulator for *ix
 *
 * This software package is subject to the GNU General Public License
 * version 3 or later (your choice) as published by the Free Software
 * Foundation.
 *
 * Copyright 1994 Alexander Jean-Claude Bottema
 * Copyright 1995 Stephen Lee
 * Copyright 1997, 1998 Aaron Culliney
 * Copyright 1998, 1999, 2000 Michael Deutschmann
 * Copyright 2013-2015 Aaron Culliney
 *
 */

#define _GNU_SOURCE


/* I'm not sure if this is the correct way to detect libc 5/4. I long
 * since removed it from my system.
 */
#ifdef __GLIBC__
#if __GLIBC__ == 1

/* Older Linux C libraries had getline removed (to humor programs that
 * used that name for their own functions), but kept getdelim */
#define getline(l,s,f) getdelim(l,s,'\n',f)

#endif /* __GLIBC__ == 1 */
#endif /* __GLIBC__ */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

int main(void)
{
    unsigned char byte;

    char *line = 0;
    size_t line_size = 0;

    int i,mx=0;

    printf("/* Apple II text font data\n"
           " *\n"
           " * THIS FILE IS AUTOMATICALLY GENERATED --- DO NOT EDIT\n"
           " */\n");

    i = 0x100;

    while (getline(&line,&line_size,stdin) != -1)
    {
        if (line[0] == ';')
        {
            continue;
        }

        if (line[0] == '=')
        {
            char *name,*size;

            name = line + 1;
            while (isspace(*name))
            {
                name++;
            }

            size = strchr(name,',');
            *size++ = 0;
            mx = i = strtol(size,0,0);

            printf("\nconst unsigned char %s[%d] =\n{\n  ",name,i*8);

            continue;
        }

        i--;

        if (line[0] == ':')
        {
            int j = 8;
            {
                int len = strlen(line);
                line[len-1] = '\0'; // kill newline
                printf("/* %s */\n", line);
            }

            while (j--)
            {
                int k;

                if (getline(&line,&line_size,stdin) == -1)
                {
                    // ERROR ...
                }

                k = 8;
                byte = 0;
                while (k--)
                {
                    byte <<= 1;
                    byte += (line[k] == '#') ? 1 : 0;
                }

                if (j)
                {
                    printf("0x%02x, ",byte);
                }
                else if (i)
                {
                    printf("0x%02x,\n  ",byte); /* last byte in glyph */
                }
                else
                {
                    printf("0x%02x\n};\n",byte); /* last item in array */
                }
            }
        }
        else
        {
            break;
        }
    }


    if (i)
    {
        fprintf(stderr,
                "Trouble with font file at character 0x%02x\n",
                mx-i-1);
        exit(EXIT_FAILURE);
    }

    exit(EXIT_SUCCESS);

}