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reactos/lib/rtl/swprintf.c
Timo Kreuzer 9ea495ba33 Create a branch for header work. 
svn path=/branches/header-work/; revision=45691
2010-02-26 22:57:55 +00:00

731 lines
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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 <rtl.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 union {
struct {
unsigned int mantissal:32;
unsigned int mantissah:20;
unsigned int exponent:11;
unsigned int sign:1;
};
long long AsLongLong;
} double_t;
/* We depend on this being true */
C_ASSERT(sizeof(double_t) == sizeof(double));
static
__inline
int
_isinf(double_t x)
{
return ( x.exponent == 0x7ff && ( x.mantissah == 0 && x.mantissal == 0 ));
}
static
__inline
int
_isnan(double_t x)
{
return ( x.exponent == 0x7ff && ( x.mantissah != 0 || 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 wchar_t **s)
{
int i=0;
while (iswdigit(**s))
i = i*10 + *((*s)++) - L'0';
return i;
}
static wchar_t *
number(wchar_t * buf, wchar_t * end, long long num, int base, int size, int precision, int type)
{
wchar_t c, sign, tmp[66];
const wchar_t *digits;
const wchar_t *small_digits = L"0123456789abcdefghijklmnopqrstuvwxyz";
const wchar_t *large_digits = L"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) ? L'0' : L' ';
sign = 0;
if (type & SIGN) {
if (num < 0) {
sign = L'-';
num = -num;
size--;
} else if (type & PLUS) {
sign = L'+';
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++] = L'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 = L' ';
++buf;
}
}
if (sign) {
if (buf <= end)
*buf = sign;
++buf;
}
if ((type & SPECIAL) && ((type & REMOVEHEX) == 0)) {
if (base==16) {
if (buf <= end)
*buf = L'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 = L'0';
++buf;
}
while (i-- > 0) {
if (buf <= end)
*buf = tmp[i];
++buf;
}
while (size-- > 0) {
if (buf <= end)
*buf = L' ';
++buf;
}
return buf;
}
static wchar_t *
numberf(wchar_t * buf, wchar_t * end, double_t num, int base, int size, int precision, int type)
{
wchar_t c, sign, tmp[66];
const wchar_t *digits;
const wchar_t *small_digits = L"0123456789abcdefghijklmnopqrstuvwxyz";
const wchar_t *large_digits = L"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int i;
/* 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) ? L'0' : L' ';
sign = 0;
if (type & SIGN) {
if (num.sign) {
sign = L'-';
num.sign = 0;
size--;
} else if (type & PLUS) {
sign = L'+';
size--;
} else if (type & SPACE) {
sign = ' ';
size--;
}
}
if (type & SPECIAL) {
if (base == 16)
size -= 2;
else if (base == 8)
size--;
}
i = 0;
if (num.AsLongLong == 0)
tmp[i++] = L'0';
else while (num.AsLongLong != 0)
{
tmp[i++] = digits[do_div(&num.AsLongLong,base)];
}
if (i > precision)
precision = i;
size -= precision;
if (!(type&(ZEROPAD+LEFT))) {
while(size-->0) {
if (buf <= end)
*buf = L' ';
++buf;
}
}
if (sign) {
if (buf <= end)
*buf = sign;
++buf;
}
if (type & SPECIAL) {
if (base==8) {
if (buf <= end)
*buf = L'0';
++buf;
} else if (base==16) {
if (buf <= end)
*buf = L'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 = L'0';
++buf;
}
while (i-- > 0) {
if (buf <= end)
*buf = tmp[i];
++buf;
}
while (size-- > 0) {
if (buf <= end)
*buf = L' ';
++buf;
}
return buf;
}
static wchar_t*
string(wchar_t* buf, wchar_t* end, const char* s, int len, int field_width, int precision, int flags)
{
int i;
wchar_t c;
c = (flags & ZEROPAD) ? L'0' : L' ';
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 = L' ';
++buf;
}
return buf;
}
static wchar_t*
stringw(wchar_t* buf, wchar_t* end, const wchar_t* sw, int len, int field_width, int precision, int flags)
{
int i;
wchar_t c;
c = (flags & ZEROPAD) ? L'0' : L' ';
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 = *sw++;
buf++;
}
while (len < field_width--)
{
if (buf <= end)
*buf = L' ';
buf++;
}
return buf;
}
/*
* @implemented
*/
int __cdecl _vsnwprintf(wchar_t *buf, size_t cnt, const wchar_t *fmt, va_list args)
{
int len;
unsigned long long num;
int base;
wchar_t * str, * end;
const char *s;
const wchar_t *sw;
const wchar_t *ss;
double_t _double;
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', 'w' or 'I' for integer fields */
str = buf;
end = buf + cnt - 1;
if (end < buf - 1) {
end = ((wchar_t *) -1);
cnt = end - buf + 1;
}
for ( ; *fmt ; ++fmt) {
if (*fmt != L'%') {
if (str <= end)
*str = *fmt;
++str;
continue;
}
/* process flags */
flags = 0;
repeat:
++fmt; /* this also skips first '%' */
switch (*fmt) {
case L'-': flags |= LEFT; goto repeat;
case L'+': flags |= PLUS; goto repeat;
case L' ': flags |= SPACE; goto repeat;
case L'#': flags |= SPECIAL; goto repeat;
case L'0': flags |= ZEROPAD; goto repeat;
}
/* get field width */
field_width = -1;
if (iswdigit(*fmt))
field_width = skip_atoi(&fmt);
else if (*fmt == L'*') {
++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 == L'.') {
++fmt;
if (iswdigit(*fmt))
precision = skip_atoi(&fmt);
else if (*fmt == L'*') {
++fmt;
/* it's the next argument */
precision = va_arg(args, int);
}
if (precision < 0)
precision = 0;
}
/* get the conversion qualifier */
qualifier = -1;
if (*fmt == L'l' && *(fmt+1) == L'l') {
qualifier = L'I';
fmt += 2;
} else if (*fmt == L'h' || *fmt == L'l' || *fmt == L'L' || *fmt == L'w') {
qualifier = *fmt;
++fmt;
} else if (*fmt == L'I' && *(fmt+1) == L'6' && *(fmt+2) == L'4') {
qualifier = *fmt;
fmt += 3;
} else if (*fmt == L'I' && *(fmt+1) == L'3' && *(fmt+2) == L'2') {
qualifier = L'l';
fmt += 3;
} else if (*fmt == L'F' && *(fmt+1) == L'p') {
fmt += 1;
flags |= REMOVEHEX;
}
/* default base */
base = 10;
switch (*fmt) {
case L'c':
if (qualifier == 'h' || 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 L'C':
if (!(flags & LEFT))
while (--field_width > 0) {
if (str <= end)
*str = L' ';
++str;
}
if (qualifier == 'l' || qualifier == 'w') {
if (str <= end)
*str = (wchar_t) va_arg(args, int);
++str;
} else {
if (str <= end)
*str = (wchar_t) va_arg(args, int);
++str;
}
while (--field_width > 0) {
if (str <= end)
*str = L' ';
++str;
}
continue;
case L'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 L'S':
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 L'Z':
if (qualifier == 'h') {
/* 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);
} else {
/* 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);
}
continue;
case L'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 L'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 = va_arg(args, double_t);
if ( _isnan(_double) ) {
ss = L"Nan";
len = 3;
while ( len > 0 ) {
if (str <= end)
*str = *ss++;
++str;
len --;
}
} else if ( _isinf(_double) < 0 ) {
ss = L"-Inf";
len = 4;
while ( len > 0 ) {
if (str <= end)
*str = *ss++;
++str;
len --;
}
} else if ( _isinf(_double) > 0 ) {
ss = L"+Inf";
len = 4;
while ( len > 0 ) {
if (str <= end)
*str = *ss++;
++str;
len --;
}
} else {
if ( precision == -1 )
precision = 6;
str = numberf(str, end, _double, base, field_width, precision, flags);
}
continue;
/* integer number formats - set up the flags and "break" */
case L'o':
base = 8;
break;
case L'b':
base = 2;
break;
case L'X':
flags |= LARGE;
case L'x':
base = 16;
break;
case L'd':
case L'i':
flags |= SIGN;
case L'u':
break;
default:
if (*fmt) {
if (str <= end)
*str = *fmt;
++str;
} else
--fmt;
continue;
}
if (qualifier == L'I')
num = va_arg(args, unsigned long long);
else if (qualifier == L'l') {
if (flags & SIGN)
num = va_arg(args, long);
else
num = va_arg(args, unsigned long);
}
else if (qualifier == L'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 = L'\0';
else if (cnt > 0)
/* don't write out a null byte if the buf size is zero */
*end = L'\0';
return str-buf;
}
/*
* @implemented
*/
int swprintf(wchar_t *buf, const wchar_t *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i=_vsnwprintf(buf,MAXLONG,fmt,args);
va_end(args);
return i;
}
/*
* @implemented
*/
int __cdecl _snwprintf(wchar_t *buf, size_t cnt, const wchar_t *fmt, ...)
{
va_list args;
int i;
va_start(args, fmt);
i=_vsnwprintf(buf,cnt,fmt,args);
va_end(args);
return i;
}
/*
* @implemented
*/
int __cdecl vswprintf(wchar_t *buf, const wchar_t *fmt, va_list args)
{
return _vsnwprintf(buf,MAXLONG,fmt,args);
}
/* EOF */
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