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reactos/win32ss/drivers/font/ftfd/sprintf.c

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/*
* PROGRAMMERS: David Welch
* Eric Kohl
*
* TODO:
* - Verify the implementation of '%Z'.
*/
/*
* linux/lib/vsprintf.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
/* vsprintf.c -- Lars Wirzenius & Linus Torvalds. */
/*
* Wirzenius wrote this portably, Torvalds fucked it up :-)
*/
#include <ndk/ntndk.h>
#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 REMOVEHEX 256 /* use 256 as remve 0x frim BASE 16 */
typedef struct {
unsigned int mantissal:32;
unsigned int mantissah:20;
unsigned int exponent:11;
unsigned int sign:1;
} double_t;
static
__inline
int
_isinf(double __x)
{
union
{
double* __x;
double_t* x;
} x;
x.__x = &__x;
return ( x.x->exponent == 0x7ff && ( x.x->mantissah == 0 && x.x->mantissal == 0 ));
}
static
__inline
int
_isnan(double __x)
{
union
{
double* __x;
double_t* x;
} x;
x.__x = &__x;
return ( x.x->exponent == 0x7ff && ( x.x->mantissah != 0 || x.x->mantissal != 0 ));
}
static
__inline
int
do_div(long long *n, int base)
{
int a;
a = ((unsigned long long) *n) % (unsigned) base;
*n = ((unsigned long long) *n) / (unsigned) base;
return a;
}
static int skip_atoi(const char **s)
{
int i=0;
while (isdigit(**s))
i = i*10 + *((*s)++) - '0';
return i;
}
static char *
number(char * buf, char * end, long long num, int base, int size, int precision, int type)
{
char c,sign,tmp[66];
const char *digits;
const char *small_digits = "0123456789abcdefghijklmnopqrstuvwxyz";
const char *large_digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int i;
digits = (type & LARGE) ? large_digits : small_digits;
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) && ((type & REMOVEHEX) == 0)) {
if (base == 16)
size -= 2;
}
i = 0;
if ((num == 0) && (precision !=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) {
if (buf <= end)
*buf = ' ';
++buf;
}
}
if (sign) {
if (buf <= end)
*buf = sign;
++buf;
}
if ((type & SPECIAL) && ((type & REMOVEHEX) == 0)) {
if (base==16) {
if (buf <= end)
*buf = '0';
++buf;
if (buf <= end)
*buf = digits[33];
++buf;
}
}
if (!(type & LEFT)) {
while (size-- > 0) {
if (buf <= end)
*buf = c;
++buf;
}
}
while (i < precision--) {
if (buf <= end)
*buf = '0';
++buf;
}
while (i-- > 0) {
if (buf <= end)
*buf = tmp[i];
++buf;
}
while (size-- > 0) {
if (buf <= end)
*buf = ' ';
++buf;
}
return buf;
}
static char *
numberf(char * buf, char * end, double num, int base, int size, int precision, int type)
{
char c,sign,tmp[66];
const char *digits;
const char *small_digits = "0123456789abcdefghijklmnopqrstuvwxyz";
const char *large_digits = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int i;
long long x;
/* FIXME
the float version of number is direcly copy of number
*/
digits = (type & LARGE) ? large_digits : small_digits;
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)
{
x = num;
tmp[i++] = digits[do_div(&x,base)];
num=x;
}
if (i > precision)
precision = i;
size -= precision;
if (!(type&(ZEROPAD+LEFT))) {
while(size-->0) {
if (buf <= end)
*buf = ' ';
++buf;
}
}
if (sign) {
if (buf <= end)
*buf = sign;
++buf;
}
if (type & SPECIAL) {
if (base==8) {
if (buf <= end)
*buf = '0';
++buf;
} else if (base==16) {
if (buf <= end)
*buf = '0';
++buf;
if (buf <= end)
*buf = digits[33];
++buf;
}
}
if (!(type & LEFT)) {
while (size-- > 0) {
if (buf <= end)
*buf = c;
++buf;
}
}
while (i < precision--) {
if (buf <= end)
*buf = '0';
++buf;
}
while (i-- > 0) {
if (buf <= end)
*buf = tmp[i];
++buf;
}
while (size-- > 0) {
if (buf <= end)
*buf = ' ';
++buf;
}
return buf;
}
static char*
string(char* buf, char* end, const char* s, int len, int field_width, int precision, int flags)
{
int i;
char c;
c = (flags & ZEROPAD) ? '0' : ' ';
if (s == NULL)
{
s = "<NULL>";
len = 6;
}
else
{
if (len == -1)
{
len = 0;
while ((unsigned int)len < (unsigned int)precision && s[len])
len++;
}
else
{
if ((unsigned int)len > (unsigned int)precision)
len = precision;
}
}
if (!(flags & LEFT))
while (len < field_width--)
{
if (buf <= end)
*buf = c;
++buf;
}
for (i = 0; i < len; ++i)
{
if (buf <= end)
*buf = *s++;
++buf;
}
while (len < field_width--)
{
if (buf <= end)
*buf = ' ';
++buf;
}
return buf;
}
static char*
stringw(char* buf, char* end, const wchar_t* sw, int len, int field_width, int precision, int flags)
{
int i;
char c;
c = (flags & ZEROPAD) ? '0' : ' ';
if (sw == NULL)
{
sw = L"<NULL>";
len = 6;
}
else
{
if (len == -1)
{
len = 0;
while ((unsigned int)len < (unsigned int)precision && sw[len])
len++;
}
else
{
if ((unsigned int)len > (unsigned int)precision)
len = precision;
}
}
if (!(flags & LEFT))
while (len < field_width--)
{
if (buf <= end)
*buf = c;
buf++;
}
for (i = 0; i < len; ++i)
{
if (buf <= end)
*buf = (unsigned char)(*sw++);
buf++;
}
while (len < field_width--)
{
if (buf <= end)
*buf = ' ';
buf++;
}
return buf;
}
/*
* @implemented
*/
int __cdecl _vsnprintf(char *buf, size_t cnt, const char *fmt, va_list args)
{
int len;
unsigned long long num;
double _double;
int base;
char *str, *end;
const char *s;
const wchar_t *sw;
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', 'L', 'I' or 'w' for integer fields */
/* clear the string buffer with zero so we do not need NULL terment it at end */
str = buf;
end = buf + cnt - 1;
if (end < buf - 1) {
end = ((char *) -1);
cnt = end - buf + 1;
}
for ( ; *fmt ; ++fmt) {
if (*fmt != '%') {
if (str <= end)
*str = *fmt;
++str;
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' || *fmt == 'w') {
qualifier = *fmt;
++fmt;
} else if (*fmt == 'I' && *(fmt+1) == '6' && *(fmt+2) == '4') {
qualifier = *fmt;
fmt += 3;
} else if (*fmt == 'I' && *(fmt+1) == '3' && *(fmt+2) == '2') {
qualifier = 'l';
fmt += 3;
} else if (*fmt == 'F' && *(fmt+1) == 'p') {
fmt += 1;
flags |= REMOVEHEX;
}
/* default base */
base = 10;
switch (*fmt) {
case 'c': /* finished */
if (qualifier == 'l' || qualifier == 'w') {
wchar_t sw1[2];
/* print unicode string */
sw1[0] = (wchar_t) va_arg(args, int);
sw1[1] = 0;
str = stringw(str, end, (wchar_t *)&sw1, -1, field_width, precision, flags);
} else {
char s1[2];
/* print ascii string */
s1[0] = ( unsigned char) va_arg(args, int);
s1[1] = 0;
str = string(str, end, (char *)&s1, -1, field_width, precision, flags);
}
continue;
case 'C': /* finished */
if (!(flags & LEFT))
while (--field_width > 0) {
if (str <= end)
*str = ' ';
++str;
}
if (qualifier == 'h') {
if (str <= end)
*str = (unsigned char) va_arg(args, int);
++str;
} else {
if (str <= end)
*str = (unsigned char)(wchar_t) va_arg(args, int);
++str;
}
while (--field_width > 0) {
if (str <= end)
*str = ' ';
++str;
}
continue;
case 's': /* finished */
if (qualifier == 'l' || qualifier == 'w') {
/* print unicode string */
sw = va_arg(args, wchar_t *);
str = stringw(str, end, sw, -1, field_width, precision, flags);
} else {
/* print ascii string */
s = va_arg(args, char *);
str = string(str, end, s, -1, field_width, precision, flags);
}
continue;
case 'S':
if (qualifier == 'h') {
/* print ascii string */
s = va_arg(args, char *);
str = string(str, end, s, -1, field_width, precision, flags);
} else {
/* print unicode string */
sw = va_arg(args, wchar_t *);
str = stringw(str, end, sw, -1, field_width, precision, flags);
}
continue;
case 'Z':
if (qualifier == 'w') {
/* print counted unicode string */
PUNICODE_STRING pus = va_arg(args, PUNICODE_STRING);
if ((pus == NULL) || (pus->Buffer == NULL)) {
sw = NULL;
len = -1;
} else {
sw = pus->Buffer;
len = pus->Length / sizeof(WCHAR);
}
str = stringw(str, end, sw, len, field_width, precision, flags);
} else {
/* print counted ascii string */
PANSI_STRING pus = va_arg(args, PANSI_STRING);
if ((pus == NULL) || (pus->Buffer == NULL)) {
s = NULL;
len = -1;
} else {
s = pus->Buffer;
len = pus->Length;
}
str = string(str, end, s, len, field_width, precision, flags);
}
continue;
case 'p':
if ((flags & LARGE) == 0)
flags |= LARGE;
if (field_width == -1) {
field_width = 2 * sizeof(void *);
flags |= ZEROPAD;
}
str = number(str, end,
(ULONG_PTR) va_arg(args, void *), 16,
field_width, precision, flags);
continue;
case 'n':
/* FIXME: What does C99 say about the overflow case here? */
if (qualifier == 'l') {
long * ip = va_arg(args, long *);
*ip = (str - buf);
} else {
int * ip = va_arg(args, int *);
*ip = (str - buf);
}
continue;
/* float number formats - set up the flags and "break" */
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
_double = (double)va_arg(args, double);
if ( _isnan(_double) ) {
s = "Nan";
len = 3;
while ( len > 0 ) {
if (str <= end)
*str = *s++;
++str;
len --;
}
} else if ( _isinf(_double) < 0 ) {
s = "-Inf";
len = 4;
while ( len > 0 ) {
if (str <= end)
*str = *s++;
++str;
len --;
}
} else if ( _isinf(_double) > 0 ) {
s = "+Inf";
len = 4;
while ( len > 0 ) {
if (str <= end)
*str = *s++;
++str;
len --;
}
} else {
if ( precision == -1 )
precision = 6;
str = numberf(str, end, (int)_double, base, field_width, precision, flags);
}
continue;
/* integer number formats - set up the flags and "break" */
case 'o':
base = 8;
break;
case 'b':
base = 2;
break;
case 'X':
flags |= LARGE;
case 'x':
base = 16;
break;
case 'd':
case 'i':
flags |= SIGN;
case 'u':
break;
default:
if (*fmt) {
if (str <= end)
*str = *fmt;
++str;
} else
--fmt;
continue;
}
if (qualifier == 'I')
num = va_arg(args, unsigned long long);
else if (qualifier == 'l') {
if (flags & SIGN)
num = va_arg(args, long);
else
num = va_arg(args, unsigned long);
}
else if (qualifier == 'h') {
if (flags & SIGN)
num = va_arg(args, int);
else
num = va_arg(args, unsigned int);
}
else {
if (flags & SIGN)
num = va_arg(args, int);
else
num = va_arg(args, unsigned int);
}
str = number(str, end, num, base, field_width, precision, flags);
}
if (str <= end)
*str = '\0';
else if (cnt > 0)
/* don't write out a null byte if the buf size is zero */
*end = '\0';
return str-buf;
}
/*
* @implemented
*/
int sprintf(char * buf, const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i=_vsnprintf(buf,MAXLONG,fmt,args);
va_end(args);
return i;
}
/*
* @implemented
*/
int _snprintf(char * buf, size_t cnt, const char *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i=_vsnprintf(buf,cnt,fmt,args);
va_end(args);
return i;
}
/*
* @implemented
*/
int __cdecl vsprintf(char *buf, const char *fmt, va_list args)
{
return _vsnprintf(buf,MAXLONG,fmt,args);
}
/* EOF */
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