#ident "$Id: conio.c,v 1.7 2003/04/10 06:28:08 hpa Exp $"/* ----------------------------------------------------------------------- * *    *   Copyright 2001 H. Peter Anvin - All Rights Reserved * *   This program is free software; you can redistribute it and/or modify *   it under the terms of the GNU General Public License as published by *   the Free Software Foundation, Inc., 53 Temple Place Ste 330, *   Bostom MA 02111-1307, USA; either version 2 of the License, or *   (at your option) any later version; incorporated herein by reference. * * ----------------------------------------------------------------------- *//* * conio.c * * Output to the screen */#include <stdint.h>#include "memdisk.h"#include "conio.h"int putchar(int ch){  com32sys_t regs;  if ( ch == '\n' ) {    /* \n -> \r\n */    putchar('\r');  }    regs.eax.w[0] = 0x0e00|(ch&0xff);  syscall(0x10, &regs, NULL);  return ch;}int puts(const char *s){  int count = 0;  while ( *s ) {    putchar(*s);    count++;    s++;  }  return count;}/* * Oh, it's a waste of space, but oh-so-yummy for debugging.  It's just * initialization code anyway, so it doesn't take up space when we're * actually running.  This version of printf() does not include 64-bit * support.  "Live with it." * * Most of this code was shamelessly snarfed from the Linux kernel, then * modified. */static inline intisdigit(int ch){  return (ch >= '0') && (ch <= '9');}static int skip_atoi(const char **s){  int i=0;    while (isdigit(**s))    i = i*10 + *((*s)++) - '0';  return i;}unsigned int atou(const char *s){  unsigned int i = 0;  while (isdigit(*s))    i = i*10 + (*s++ - '0');  return i;}static int strnlen(const char *s, int maxlen){  const char *es = s;  while ( *es && maxlen ) {    es++; maxlen--;  }  return (es-s);}#define ZEROPAD	1		/* pad with zero */#define SIGN	2		/* unsigned/signed long */#define PLUS	4		/* show plus */#define SPACE	8		/* space if plus */#define LEFT	16		/* left justified */#define SPECIAL	32		/* 0x */#define LARGE	64		/* use 'ABCDEF' instead of 'abcdef' */#define do_div(n,base) ({ \int __res; \__res = ((unsigned long) n) % (unsigned) base; \n = ((unsigned long) n) / (unsigned) base; \__res; })static char * number(char * str, long num, int base, int size, int precision	,int type){  char c,sign,tmp[66];  const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";  int i;    if (type & LARGE)    digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";  if (type & LEFT)    type &= ~ZEROPAD;  if (base < 2 || base > 36)    return 0;  c = (type & ZEROPAD) ? '0' : ' ';  sign = 0;  if (type & SIGN) {    if (num < 0) {      sign = '-';      num = -num;      size--;    } else if (type & PLUS) {      sign = '+';      size--;    } else if (type & SPACE) {      sign = ' ';      size--;    }  }  if (type & SPECIAL) {    if (base == 16)      size -= 2;    else if (base == 8)      size--;  }  i = 0;  if (num == 0)    tmp[i++]='0';  else while (num != 0)    tmp[i++] = digits[do_div(num,base)];  if (i > precision)    precision = i;  size -= precision;  if (!(type&(ZEROPAD+LEFT)))    while(size-->0)      *str++ = ' ';  if (sign)    *str++ = sign;  if (type & SPECIAL) {    if (base==8)      *str++ = '0';    else if (base==16) {      *str++ = '0';      *str++ = digits[33];    }  }  if (!(type & LEFT))    while (size-- > 0)      *str++ = c;  while (i < precision--)    *str++ = '0';  while (i-- > 0)    *str++ = tmp[i];  while (size-- > 0)    *str++ = ' ';  return str;}/* Forward decl. needed for IP address printing stuff... */int sprintf(char * buf, const char *fmt, ...);int vsprintf(char *buf, const char *fmt, va_list args){  int len;  unsigned long num;  int i, base;  char * str;  const char *s;    int flags;		/* flags to number() */    int field_width;	/* width of output field */  int precision;		/* min. # of digits for integers; max				   number of chars for from string */  int qualifier;		/* 'h', 'l', or 'L' for integer fields */    for (str=buf ; *fmt ; ++fmt) {    if (*fmt != '%') {      *str++ = *fmt;      continue;    }        /* process flags */    flags = 0;  repeat:    ++fmt;		/* this also skips first '%' */    switch (*fmt) {    case '-': flags |= LEFT; goto repeat;    case '+': flags |= PLUS; goto repeat;    case ' ': flags |= SPACE; goto repeat;    case '#': flags |= SPECIAL; goto repeat;    case '0': flags |= ZEROPAD; goto repeat;    }        /* get field width */    field_width = -1;    if (isdigit(*fmt))      field_width = skip_atoi(&fmt);    else if (*fmt == '*') {      ++fmt;      /* it's the next argument */      field_width = va_arg(args, int);      if (field_width < 0) {	field_width = -field_width;	flags |= LEFT;      }    }        /* get the precision */    precision = -1;    if (*fmt == '.') {      ++fmt;	      if (isdigit(*fmt))	precision = skip_atoi(&fmt);      else if (*fmt == '*') {	++fmt;	/* it's the next argument */	precision = va_arg(args, int);      }      if (precision < 0)	precision = 0;    }        /* get the conversion qualifier */    qualifier = -1;    if (*fmt == 'h' || *fmt == 'l' || *fmt == 'L') {      qualifier = *fmt;      ++fmt;    }        /* default base */    base = 10;        switch (*fmt) {    case 'c':      if (!(flags & LEFT))	while (--field_width > 0)	  *str++ = ' ';      *str++ = (unsigned char) va_arg(args, int);      while (--field_width > 0)	*str++ = ' ';      continue;          case 's':      s = va_arg(args, char *);      len = strnlen(s, precision);            if (!(flags & LEFT))	while (len < field_width--)	  *str++ = ' ';      for (i = 0; i < len; ++i)	*str++ = *s++;      while (len < field_width--)	*str++ = ' ';      continue;          case 'p':      if (field_width == -1) {	field_width = 2*sizeof(void *);	flags |= ZEROPAD;      }      str = number(str,		   (unsigned long) va_arg(args, void *), 16,		   field_width, precision, flags);      continue;                case 'n':      if (qualifier == 'l') {	long * ip = va_arg(args, long *);	*ip = (str - buf);      } else {	int * ip = va_arg(args, int *);	*ip = (str - buf);      }      continue;          case '%':      *str++ = '%';      continue;            /* integer number formats - set up the flags and "break" */    case 'o':      base = 8;      break;          case 'X':      flags |= LARGE;    case 'x':      base = 16;      break;          case 'd':    case 'i':      flags |= SIGN;    case 'u':      break;          default:      *str++ = '%';      if (*fmt)	*str++ = *fmt;      else	--fmt;      continue;    }    if (qualifier == 'l')      num = va_arg(args, unsigned long);    else if (qualifier == 'h') {      num = (unsigned short) va_arg(args, int);      if (flags & SIGN)	num = (short) num;    } else if (flags & SIGN)      num = va_arg(args, int);    else      num = va_arg(args, unsigned int);    str = number(str, num, base, field_width, precision, flags);  }  *str = '\0';  return str-buf;}int sprintf(char * buf, const char *fmt, ...){  va_list args;  int i;    va_start(args, fmt);  i=vsprintf(buf,fmt,args);  va_end(args);  return i;}int printf(const char *fmt, ...){  char printf_buf[1024];  va_list args;  int printed;  va_start(args, fmt);  printed = vsprintf(printf_buf, fmt, args);  va_end(args);  puts(printf_buf);  return printed;}