source: vital-to8-sdk/mc09/src/stdio.txt

#define FILE    char
#define FCBSIZE 320
#define NFILES  16

#define NULL    0
#define EOF     (-1)

#define stdin   _fcbtbl[0]
#define stdout  _fcbtbl[1]
#define stderr  _fcbtbl[2]

#define STDIN   0xffff
#define STDOUT  0xfffe
#define STDERR  0xfffd

FILE *_fcbtbl[NFILES];

char _ch;
int _fch = 0;

_main(argc,argv)
int argc;
char **argv;
{int i;
        initheap();
        stdin = STDIN;
        stdout = STDOUT;
        stderr = STDERR;
        for (i = 3; i < NFILES; ++i) _fcbtbl[i] = NULL;
        main(argc,argv);
}

ungetc(c,fp)
char c;
FILE *fp;
{       if (fp == STDIN)
        {       _fch = 1;
                return _ch = c;
        }
        fp[62] = 1;
        return fp[61] = c;
}

getc(fp)
FILE *fp;
{
        switch ( fp ) {
        case STDIN:
                if (_fch) { _fch = 0; return _ch; }
                return GETCH();
        case STDOUT:
        case STDERR:
                return EOF;
        default:
                if (fp[2] != 1) return -1;
                if (fp[62]) { fp[62] = 0; return fp[61]; }
                return FMS(fp,0);
        }
}

putc(c,fp)
char c;
FILE *fp;
{       switch ( fp ) {
        case STDIN:
                return EOF;
        case STDOUT:
                return PUTCH(c);
        case STDERR:
                return PUTCH2(c);
        default:
                if (fp[2] != 2) return EOF;
                if (FMS(fp,0,c) < 0) return EOF;
                return c;
        }
}

ugetch(c)
char c;
{       return ungetc(c,stdin);
}

getchar()
{       return getc(stdin);
}

putchar(c)
char c;
{       return putc(c,stdout);
}

printf(s)
char *s;
{       _fprintf(stdout,s,(int *)&s+1);
}

fprintf(fp,s)
FILE *fp;
char *s;
{       _fprintf(fp,s,(int *)&s+1);
}

_fprintf(fp,s,p)
FILE *fp;
char *s;
int *p;
{int l,m,n;
 char c,buf[8];
        while(c = *s++)
                if (c != '%') putc(c,fp);
                else
                {       if (l=(*s == '-')) ++s;
                        if (isdigit(*s)) s += _getint(&m,s);
                        else m = 0;
                        if (*s == '.') ++s;
                        if (isdigit(*s)) s += _getint(&n,s);
                        else n = 32767;
                        switch(c = *s++)
                        {case 'd':
                                itoa(*p++,buf);
                                break;
                        case 'o':
                                itooa(*p++,buf);
                                break;
                        case 'x':
                                itoxa(*p++,buf);
                                break;
                        case 'u':
                                itoua(*p++,buf);
                                break;
                        case 'c':
                                ctos(*p++,buf);
                                break;
                        case 's':
                                _putstr(fp,*p++,l,m,n);
                                continue;
                        case '\0':
                                return;
                        default:
                                ctos(c,buf);
                                break;
                        }
                        _putstr(fp,buf,l,m,n);
                }
}

_getint(p,s)
int *p;
char *s;
{int i;
        for(*p = i = 0; isdigit(*s); ++i) *p = *p * 10 + *s++ - '0';
        return i;
}

_putstr(fp,s,l,m,n)
FILE fp;
char *s;
int l,m,n;
{int k;
        k = (strlen(s) < n ? strlen(s) : n);
        m = (k < m ? m - k : 0);
        if (l)
        {       _putsn(fp,s,n);
                _putspc(fp,m);
        }
        else
        {       _putspc(fp,m);
                _putsn(fp,s,n);
        }
}
        
_putsn(fp,s,n)
FILE fp;
char *s;
int n;
{       while(*s)
                if (--n >= 0) putc(*s++,fp);
                else break;
}

_putspc(fp,n)
FILE *fp;
int n;
{       while(--n >= 0) putc(' ',fp);
}

itoa(n,s)
int n;
char *s;
{       if (n < 0)
        {       *s++ = '-';
                return (itoua(-n,s) + 1);
        }
        return itoua(n,s);
}

itoua(n,s)
int n;
char *s;
{       return _itoda(n,s,10);
}

ctos(c,s)
char c,*s;
{       s[0] = c;
        s[1] = '\0';
        return s;
}

itooa(n,s)
int n;
char *s;
{       return _itoda(n,s,8);
}

itoxa(n,s)
int n;
char *s;
{       return _itoda(n,s,16);
}

_itoac(n);
int n;
{       return (n + ((n < 10) ? '0' : ('A'-10)));
}

_itoda(n,s,r)
unsigned n;
int r;
char *s;
{int i;
 char t[8],*u;
        u = t;
        *u++ = '\0';
        do *u++ = _itoac(n % r); while(n /= r);
        for (i=0; *s++ = *--u; ++i);
        return i;
}

isdigit(c)
char c;
{       return ('0' <= c && c <= '9');
}

isspace(c)
char c;
{       return (c == ' ' || c == '\t' || c == '\n');
}

isalpha(c)
char c;
{       return (isupper(c) || islower(c) || c == '_');
}

isupper(c)
char c;
{       return ('A' <= c && c <= 'Z');
}

islower(c)
char c;
{       return ('a' <= c && c <= 'z');
}

toupper(c)
char c;
{       return (islower(c) ? c + ('A'-'a') : c);
}

tolower(c)
char c;
{       return (isupper(c) ? c + ('a'-'A') : c);
}

atoi(s)
char *s;
{int i,m;
        while (isspace(*s)) ++s;
        if (m = (*s == '-')) ++s;
        for (i = 0; isdigit(*s);) i = i * 10 + *s++ - '0';
        return (m ? -i : i);
}
strlen(s)
char *s;
{int i;
        for (i = 0; *s++; ++i);
        return i;
}