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/* vtxprintf.c, from
* linux/lib/vsprintf.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#include <string.h>
#include <div64.h>
#include <console/vtxprintf.h>
/* haha, don't need ctype.c */
#define isdigit(c) ((c) >= '0' && (c) <= '9')
#define is_digit isdigit
#define isxdigit(c) (((c) >= '0' && (c) <= '9') || ((c) >= 'a' && (c) <= 'f') || ((c) >= 'A' && (c) <= 'F'))
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 LARGE 64 /* use 'ABCDEF' instead of 'abcdef' */
static int number(void (*tx_byte)(unsigned char byte),
unsigned long long num, int base, int size, int precision, int type)
{
char c,sign,tmp[66];
const char *digits="0123456789abcdefghijklmnopqrstuvwxyz";
int i;
int count = 0;
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 ((signed long long)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)
tx_byte(' '), count++;
if (sign)
tx_byte(sign), count++;
if (type & SPECIAL) {
if (base==8)
tx_byte('0'), count++;
else if (base==16) {
tx_byte('0'), count++;
tx_byte(digits[33]), count++;
}
}
if (!(type & LEFT))
while (size-- > 0)
tx_byte(c), count++;
while (i < precision--)
tx_byte('0'), count++;
while (i-- > 0)
tx_byte(tmp[i]), count++;
while (size-- > 0)
tx_byte(' '), count++;
return count;
}
int vtxprintf(void (*tx_byte)(unsigned char byte), const char *fmt, va_list args)
{
int len;
unsigned long long num;
int i, base;
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 */
int count;
for (count=0; *fmt ; ++fmt) {
if (*fmt != '%') {
tx_byte(*fmt), count++;
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 == '*') {
++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 == '*') {
++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;
if (*fmt == 'l') {
qualifier = 'L';
++fmt;
}
}
/* default base */
base = 10;
switch (*fmt) {
case 'c':
if (!(flags & LEFT))
while (--field_width > 0)
tx_byte(' '), count++;
tx_byte((unsigned char) va_arg(args, int)), count++;
while (--field_width > 0)
tx_byte(' '), count++;
continue;
case 's':
s = va_arg(args, char *);
if (!s)
s = "<NULL>";
len = strnlen(s, precision);
if (!(flags & LEFT))
while (len < field_width--)
tx_byte(' '), count++;
for (i = 0; i < len; ++i)
tx_byte(*s++), count++;
while (len < field_width--)
tx_byte(' '), count++;
continue;
case 'p':
if (field_width == -1) {
field_width = 2*sizeof(void *);
flags |= ZEROPAD;
}
count += number(tx_byte,
(unsigned long) va_arg(args, void *), 16,
field_width, precision, flags);
continue;
case 'n':
if (qualifier == 'L') {
long long *ip = va_arg(args, long long *);
*ip = count;
} else if (qualifier == 'l') {
long * ip = va_arg(args, long *);
*ip = count;
} else {
int * ip = va_arg(args, int *);
*ip = count;
}
continue;
case '%':
tx_byte('%'), count++;
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:
tx_byte('%'), count++;
if (*fmt)
tx_byte(*fmt), count++;
else
--fmt;
continue;
}
if (qualifier == 'L') {
num = va_arg(args, unsigned long long);
} else 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);
}
count += number(tx_byte, num, base, field_width, precision, flags);
}
return count;
}
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