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| 发表于：2008-06-24 16:12:521楼 得分:0 |
int _tk_sprintf(char* buf,char flag,int width,int prec,char size,char type,va_list* parg)
{
wchar_t wch;
char tmp[NUM_LEN + 1] = {0};
int len,pos;
char sign;
short s;
int i;
unsigned short us;
unsigned int ui,xi;
double dbl;
char* sz;
wchar_t* wsz;
switch(type)
{
case 'c':
if(buf)
{
buf[0] = va_arg(*parg,char);
buf[1] = '\0';
}
return 1;
case 'C':
wch = va_arg(*parg,wchar_t);
len = WideCharToMultiByte(CP_ACP,0,&wch,1,NULL,0,NULL,NULL);
if(buf)
{
WideCharToMultiByte(CP_ACP,0,&wch,1,buf,len,NULL,NULL);
buf[len] = '\0';
}
return len;
case 'd':
len = 0;
sign = 0;
pos = 0;
if(size == 'h')
{
s = va_arg(*parg,short);
if(s < 0)
{
sign = '-';
s = 0 - s;
}
while(s)
{
tmp[len ++] = s % 10 + 48;
s /= 10;
}
}else
{
i = va_arg(*parg,int);
if(i < 0)
{
sign = '-';
i = 0 - i;
}
while(i)
{
tmp[len ++] = i % 10 + 48;
i /= 10;
}
}
if(sign)
{
if(buf)
buf[pos] = sign;
pos ++;
width --;
}
width -= len;
while(width > 0)
{
if(buf)
buf[pos] = '0';
pos ++;
width --;
}
while(len--)
{
if(buf)
buf[pos] = tmp[len];
pos ++;
}
if(buf)
buf[pos] = '\0';
return pos;
case 'u':
len = 0;
sign = 0;
pos = 0;
if(size == 'h')
{
us = va_arg(*parg,unsigned short);
while(us)
{
tmp[len ++] = us % 10 + 48;
us /= 10;
}
}else
{
ui = va_arg(*parg,unsigned int);
while(ui)
{
tmp[len ++] = ui % 10 + 48;
ui /= 10;
}
}
width -= len;
while(width > 0)
{
if(buf)
buf[pos] = '0';
pos ++;
width --;
}
while(len--)
{
if(buf)
buf[pos] = tmp[len];
pos ++;
}
if(buf)
buf[pos] = '\0';
return pos;
case 'x':
case 'X':
len = 0;
sign = 0;
pos = 0;
if(buf)
{
buf[0] = '0';
buf[1] = type;
}
pos += 2;
ui = va_arg(*parg,unsigned int);
while(ui)
{
us = ui % 16;
if(type == 'x')
tmp[len ++] = (us < 9)? (us + 48) : (us + 87);
else
tmp[len ++] = (us < 9)? (us + 48) : (us + 55);
ui /= 16;
}
width -= len;
while(width > 0)
{
if(buf)
buf[pos] = '0';
pos ++;
width --;
}
while(len--)
{
if(buf)
buf[pos] = tmp[len];
pos ++;
}
if(buf)
buf[pos] = '\0';
return pos;
case 'f':
len = 0;
sign = 0;
pos = 0;
dbl = va_arg(*parg,double);
if(dbl < 0)
{
sign = '-';
dbl = 0 - dbl;
}
xi = (int)dbl;
dbl -= (double)xi;
if(prec)
s = (short)prec;
else
s = MAX_PREC;
while(s--)
dbl *= 10.0;
ui = (int)floor(dbl + 0.5);
if(!prec)
{
while(!(ui % 10))
ui /= 10;
}
while(ui)
{
tmp[len ++] = ui % 10 + 48;
ui /= 10;
}
if(len)
tmp[len ++] = '.';
while(xi)
{
tmp[len ++] = xi % 10 + 48;
xi /= 10;
width --;
}
if(sign)
{
if(buf)
buf[pos] = sign;
pos ++;
width --;
}
while(width > 0)
{
if(buf)
buf[pos] = '0';
pos ++;
width --;
}
while(len--)
{
if(buf)
buf[pos] = tmp[len];
pos ++;
}
if(buf)
buf[pos] = '\0';
return pos;
case 's':
len = 0;
sign = 0;
pos = 0;
sz = va_arg(*parg,char*);
if(!sz)
{
if(buf)
buf[pos] = '\0';
return pos;
}
len = strlen(sz);
width -= len;
while(width > 0)
{
if(buf)
buf[pos] = flag;
pos ++;
width --;
}
if(buf)
memcpy((void*)(buf + pos),(void*)sz,len * sizeof(char));
pos += len;
if(buf)
buf[pos] = '\0';
return pos;
case 'S':
len = 0;
sign = 0;
pos = 0;
wsz = va_arg(*parg,wchar_t*);
if(!wsz)
{
if(buf)
buf[pos] = '\0';
return pos;
}
ui = wcslen(wsz);
len = WideCharToMultiByte(CP_ACP,0,wsz,ui,NULL,0,NULL,NULL);
width -= len;
while(width > 0)
{
if(buf)
buf[pos] = flag;
pos ++;
width --;
}
if(buf)
WideCharToMultiByte(CP_ACP,0,wsz,ui,buf + pos,len,NULL,NULL);
pos += len;
if(buf)
buf[pos] = '\0';
return pos;
}
return 0;
}
这样：
int len = xspritf(NULL,"这次要分配%d个字节,18)可以返回结果串的精确长
xsprintf(buf,"a=%s",NULL)不会格式成a=(null)
xsprintf(buf,"a=%f",8.0/9.0)不会返回长长的尾巴了
xsprintf(buf,"%svs%S","俄罗斯"，L"荷兰")可以处理MBCS和UNICODE
少了些麻烦
不过没有支持[e,E,f,g,]的格式符，抱歉了
UICODE版的xwprintf道理也是一样的，就不贴出来了
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