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FPU-EMU
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PRINTK.C
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C/C++ Source or Header
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1994-05-27
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7KB
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318 lines
#include <string.h>
#include <stdarg.h>
#include <sys\types.h>
int printk(const char *fmt,...);
int sprintf(char * buf, const char *fmt, ...);
static int vsprintf(char *, const char *, va_list);
static int skip_atoi(const char **);
static char * number(char *, long, int, int, int, int);
static void console_print(const char * buffer)
{
__asm__ __volatile__(
"movb $0x09, %%ah \n\t"
"int $0x21 \n\t"
: : "dx" ((int) buffer)
);
}
int printk(const char *fmt, ...)
{
char buf[5*80];
char buf2[5*80];
va_list args;
int i,j;
va_start(args, fmt);
vsprintf(buf,fmt,args);
va_end(args);
for (i=0,j=0; buf[i]; i++,j++) {
buf2[j]=buf[i];
if (buf2[j]=='\n')
buf2[++j]='\r';
}
buf2[j]='$';
console_print(buf2);
return i;
}
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;
}
static size_t
strlen(const char *str)
{
register const char *s;
for (s = str; *s; ++s);
return (s - str);
}
/* we use this so that we can do without the ctype library */
#define is_digit(c) ((c) >= '0' && (c) <= '9')
static int
skip_atoi(const char **s)
{
int i = 0;
while (is_digit(**s))
i = i * 10 + *((*s)++) - '0';
return i;
}
#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 SMALL 64 /* use 'abcdef' instead of 'ABCDEF' */
#ifdef __EMX__
#define do_div(n,base) ({ \
int __res; \ \
__asm__("divl %4" \
:"=a" (n), "=d" (__res) \
:"0" (n),"1" (0),"r" (base)); \
__res; })
#else
#define do_div(n,base) ({ \
unsigned long _res = (unsigned long) n % (unsigned long) base; \
n = (unsigned long) n / (unsigned long) base; \
(unsigned) _res; })
#endif
static char *
number(char *str, long num, int base, int size, int precision, int type)
{
char c, sign, tmp[36];
const char *digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int i;
if (type & SMALL)
digits = "0123456789abcdefghijklmnopqrstuvwxyz";
if (type & LEFT)
type &= ~ZEROPAD;
if (base < 2 || base > 36)
return 0;
c = (type & ZEROPAD) ? '0' : ' ';
if (type & SIGN && num < 0) {
sign = '-';
num = -num;
} else
sign = (type & PLUS) ? '+' : ((type & SPACE) ? ' ' : 0);
if (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) {
unsigned long _res = (unsigned long) num % (unsigned long) base;
num = (unsigned long) num / (unsigned long) base;
tmp[i++] = digits[_res];
}
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;
}
static int
vsprintf(char *buf, const char *fmt, va_list args)
{
int len;
int i;
char *str;
char *s;
int *ip;
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 */
int use_long = 0;
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 (is_digit(*fmt))
field_width = skip_atoi(&fmt);
else if (*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 (is_digit(*fmt))
precision = skip_atoi(&fmt);
else if (*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') {
if (*fmt != 'h')
use_long = 1;
qualifier = *fmt;
++fmt;
}
switch (*fmt) {
case 'c':
if (!(flags & LEFT))
while (--field_width > 0)
*str++ = ' ';
*str++ = (unsigned char) va_arg(args, int);
while (--field_width > 0)
*str++ = ' ';
break;
case 's':
s = va_arg(args, char *);
len = strlen(s);
if (precision < 0)
precision = len;
else if (len > precision)
len = precision;
if (!(flags & LEFT))
while (len < field_width--)
*str++ = ' ';
for (i = 0; i < len; ++i)
*str++ = *s++;
while (len < field_width--)
*str++ = ' ';
break;
case 'o':
str = number(str, va_arg(args, unsigned), 8,
field_width, precision, flags);
break;
case 'p':
if (field_width == -1) {
field_width = 8;
flags |= ZEROPAD;
}
str = number(str, (unsigned) va_arg(args, void *), 16,
field_width, precision, flags);
break;
case 'x':
flags |= SMALL;
case 'X':
if (use_long)
str = number(str, va_arg(args, unsigned long), 16,
field_width, precision, flags);
else
str = number(str, va_arg(args, unsigned), 16,
field_width, precision, flags);
break;
case 'd':
case 'i':
flags |= SIGN;
case 'u':
if (use_long)
str = number(str, va_arg(args, unsigned), 10,
field_width, precision, flags);
else
str = number(str, va_arg(args, unsigned long), 10,
field_width, precision, flags);
break;
case 'n':
ip = va_arg(args, int *);
*ip = (str - buf);
break;
default:
if (*fmt != '%')
*str++ = '%';
if (*fmt)
*str++ = *fmt;
else
--fmt;
break;
}
}
*str = '\0';
return str - buf;
}